Answer:
95.2 g/mol
Explanation:
To calculate the molar mass of MgCl2
We have to separately see the molar masses of Magnesium and Chlorine
Molar mass of Magnesium: 24.305 g/mol
Molar mass of Chlorine: 35.453 g/mol
As there are two atoms of chlorine in the said molecule so the molar mass of chlorine will be multiplied by 2.
35.453*2 = 70.906 g/mol
So the total molar mass of the said molecule = Molar mass of Mg + Molar mass of two atoms of chlorine
= 24.305 + 70.906
=95.211 g/mol
Rounding off to .1
95.2 g/mol
The molar mass of magnesium chloride (MgCl₂) is calculated by summing the molar mass of magnesium (24.31 g/mol) with twice the molar mass of chlorine (35.45 g/mol for each Cl), resulting in 95.21 g/mol.
The molar mass of magnesium chloride (MgCl₂) can be calculated by adding the molar masses of magnesium (Mg) and chlorine (Cl) in the compound. Magnesium has a molar mass of 24.31 g/mol, and since there are two chlorine atoms in MgCl₂, we must consider the molar mass of Cl (approximately 35.45 g/mol) twice.
Thus, the molar mass of MgCl₂ is calculated as:
24.31 g/mol (for Mg) + 2 * 35.45 g/mol (for Cl) = 95.21 g/mol.
Therefore, the molar mass of MgCl₂ is 95.21 g/mol, which we would report to the nearest 0.1 g/mol as required.
What is the term for the direction and angle of a handwriting sample?
A) fluidity
B) lift
C) slant
D) spacing
Answer:
slant
Explanation:
A sample of which radioisotope emits particles havingthe greatest mass? A) 137Cs B) 53Fe C) 220Fr D) 3H
Answer:
c) 220 Fr
Explanation:
castle learning
The radioisotope which emits particles having the greatest mass will be 220Fr.
What is radioisotope?The radioactive isotopes of just an element are known as radioisotopes. Atoms with an unbalanced mixture of neutrons as well as protons, with extra energy in their nucleus, are also known as neutron-proton atoms.
What is massThe quantity of matter in a thing is measured by its mass.
When only the 3 most prevalent forms of ionizing radiation are considered, alpha particles get the most mass. The mass of an alpha particle is four times that of a proton as well a neutron, as well as the weight of a beta particle, is roughly 8,000 times that of a proton or neutron.
Therefore, 220 Fr will be having the greatest mass.
To know more about mass and radioisotope.
https://brainly.com/question/11680817
#SPJ2
Ammonium carbonate and iron(iii) nitrate are combined, solid iron(iii) carbonate and a solution of ammonium nitrate are formed. the net ionic equation for this reaction is:
Answer:
The net ionic equation is: 3CO₃²⁻(aq) + 2Fe³⁺(aq) → Fe₂(CO₃)₃(s).
Explanation:
For the mentioned reaction:We have the Molecular reaction:3(NH₄)₂CO₃(aq) + 2Fe(NO₃)₃(aq) → Fe₂(CO₃)₃(s) + 6NH₄NO₃(aq)
We have the total ionic reaction:
6NH₄⁺(aq) + 3CO₃²⁻(aq) + 2Fe³⁺(aq) + 6NO₃⁻ → Fe₂(CO₃)₃(s) + 6NH₄⁺(aq) + 6NO₃⁻(aq).
NH₄⁺(aq) and NO₃⁻(aq) are spectator ions that are not changed through the reaction and still dissolved in the medium, so they can be omitted to get the net ionic equation.
So, the net ionic equation is:
3CO₃²⁻(aq) + 2Fe³⁺(aq) → Fe₂(CO₃)₃(s).
Final answer:
The reaction between ammonium carbonate and iron(III) nitrate forms solid iron(III) carbonate and a solution of ammonium nitrate. The net ionic equation for this precipitation reaction is CO3^2-(aq) + Fe^3+(aq) → Fe2(CO3)3(s), which indicates the formation of the insoluble iron(III) carbonate.
Explanation:
When ammonium carbonate is combined with iron(III) nitrate, a reaction occurs where a solid precipitate and a solution of another compound are formed. According to the solubility rules, certain combinations of reactants will lead to the formation of an insoluble product, known as a precipitate. In this case, iron(III) carbonate is the precipitate, and ammonium nitrate remains in the solution.
To write the net ionic equation for this reaction, we must first write the balanced molecular equation and then the complete ionic equation. We can then identify and remove the spectator ions, which are ions that appear on both sides of the equation without undergoing a chemical change, to finally derive the net ionic equation.
The molecular equation is:
(NH4)2CO3(aq) + Fe(NO3)3(aq) → Fe2(CO3)3(s) + 3NH4NO3(aq)
The complete ionic equation is:
2NH4+(aq) + CO32-(aq) + Fe3+(aq) + 3NO3-(aq) → Fe2(CO3)3(s) + 3NH4+(aq) + 3NO3-(aq)
After identifying that the ammonium (NH4+) and nitrate (NO3-) ions are spectator ions, they can be eliminated from the equation, resulting in the net ionic equation:
CO32-(aq) + Fe3+(aq) → Fe2(CO3)3(s)
This net ionic equation represents the formation of the insoluble iron(III) carbonate precipitate from the aqueous reactants.
What is the basic theme of organization in the periodic table
Answer:
The basic theme of organization in the periodic table is that elements are divided into groups and periods based on their properties. Elements that exhibit similar properties are placed in the same group while elements that have the similar number of shell are placed in the same period. This arrangement is based basically on the increasing atomic number of the elements in the periodic table. Atomic number is used for the arrangement of the element because it is a fundamental property of all elements.
What is the balanced equation for the combustion of sulfur
Answer:
There are three possible chemical equations for the combustion of sulfur:
2S (s) + O₂ (g) → 2SO (g)S (s) + O₂ (g) → SO₂ (g)2S (s) + 3O₂ (g) → 2SO₃ (g)Explanation:
Combustion is a reaction with oxygen. The products of the reaction are oxides, and energy is released in the form of heat and light.
Sulfur iis a nonmetal, so the oxide formed is a nonmetal oxide.
The most common oxidation numbers of sulfur are -2, + 2, + 4, and + 6.
The combination of sulfur with oxygen may be only with the positive oxidation numbers (+2, + 4, and +6).
Then you have three different equations for sulfur combustion:
1) Oxidation number +2:
S(s) + O₂(g) → SO(g)Which when balanced is: 2S(g) + O₂(g) → 2SO(g)
2) Oxitation number +4:
S(s) + O₂(g) → SO₂(g)That equation is already balanced.
3) Oxidation number +6:
S(s) + O₂(g) → SO₃(g)Which when balanced is: 2S(s) + 3O₂(g) → 2SO₃(g)
The balanced equation for the combustion of sulfur is [tex]\[ \text{S}(s) + \text{O}_2(g) \rightarrow \text{SO}_2(g) \][/tex]
To balance this equation, we need to ensure that the number of atoms of each element is the same on both sides of the equation. Sulfur (S) is present as a diatomic molecule [tex](S_2)[/tex] when it reacts with oxygen [tex](O_2)[/tex] to form sulfur dioxide [tex](SO_2)[/tex]. The balanced equation considering the diatomic nature of sulfur is:
[tex]\[ \text{S}_2(s) + \text{O}_2(g) \rightarrow 2\text{SO}_2(g) \][/tex]
Here's the step-by-step process to balance the equation:
1. Start by writing the unbalanced equation with the correct formulas for the reactants and products:
[tex]\[ \text{S}_2 + \text{O}_2 \rightarrow \text{SO}_2 \][/tex]
2. Count the number of atoms of each element on both sides of the equation:
On the left side, there are 2 sulfur (S) atoms and 2 oxygen (O) atoms.
On the right side, there is 1 sulfur (S) atom and 2 oxygen (O) atoms.
3. To balance the sulfur atoms, we need to have the same number of sulfur atoms on both sides. Since there are 2 sulfur atoms on the left, we need to multiply the sulfur dioxide [tex](SO_2)[/tex] by 2 on the right side:
[tex]\[ \text{S}_2 + \text{O}_2 \rightarrow 2\text{SO}_2 \][/tex]
4. Now, count the number of oxygen atoms again. There are 2 oxygen atoms on the left and 4 on the right (2 molecules of [tex]SO_2[/tex], each with 2 oxygen atoms).
5. To balance the oxygen atoms, we need to have 4 oxygen atoms on the left side as well. Since we already have 2 oxygen atoms in one [tex]O_2[/tex] molecule, we need to add another [tex]O_2[/tex] molecule:
[tex]\[ \text{S}_2 + 2\text{O}_2 \rightarrow 2\text{SO}_2 \][/tex]
6. Finally, count the atoms on both sides to confirm that the equation is balanced:
Left side: 2 S atoms and 4 O atoms.
Right side: 2 S atoms (2 molecules of [tex]SO_2[/tex], each with 1 S atom) and 4 O atoms (2 molecules of [tex]SO_2[/tex], each with 2 O atoms).
The equation is now balanced with 2 sulfur atoms and 4 oxygen atoms on both sides."
Question 3(Multiple Choice Worth 4 points)
(08.04 LC)
Which of the following happens to an acid when it reacts with another substance?
It receives a hydrogen ion.
It receives a hydroxide ion.
It donates a hydroxide ion.
It donates a hydrogen ion.
Answer:
It donates a hydrogen ion
Explanation:
Under the Bronsted-Lowry definition of an acid, acids are protons donors which donate the H+ ion, or the hydrogen ion.
Answer:
The correct option is "it donates a hydrogen ion"
Explanation:
The choice for the last option being the correct answer is because of the Bronsted-Lowry definition of an acid. Bronsted-Lowry acid is a substance that donates a hydrogen ion or a proton.
Consider the reaction below
HCl + NH₃ ⇒ NH₄⁺ + Cl⁻
From the above, we can see that HCl is an example of Bronsted-lowry acid since it donates its hydrogen ion to NH₃ to form NH₄⁺
Carbohydrates are nutrients that supply the main energy source for the body. True or False
Answer:
false
Explanation:
Why does increasing temperature increase the rate of reaction?
Answer:
Explanation:
Reaction rate measures the speed of chemical reaction and how they proceed with time.
The theories that have been propounded about reactions rates shows that increasing temperature is very important in chemical reactions.
From observation, chemical reaction rates are controlled by:
Nature of the reactantsConcentration of the reactants or pressure for gasesTemperaturePresence of catalystSunlightIncreasing temperature temperature releases heat energy to drive reactions into completing faster. Collisions between reacting particles becomes more as a result of increase in energy. This energy when greater than the activation energy of the reaction would further influence the effectiveness of collisions between reacting particles. This would therefore make reactions proceed faster with more increase in temperature.
In the lab, a chemist adds 3.6 grams of sodium chloride to 100.0 g of water. what is the molality of the solution?
Answer:
0.616 m.
Explanation:
Molality (m) is defined as the no. of moles of solute dissolved in a 1.0 kg of the solvent.m = (no. of moles of solute)/(mass of the solvent (kg))
m = (mass/molar mass) NaCl / (mass of the solvent (kg))
mass of NaCl = 3.6 g, molar mass of NaCl = 58.44 g/mol, mass of water = 100.0 g = 0.1 kg.
m = (mass/molar mass) NaCl / (mass of the solvent (kg)) = (3.6 g / 58.44 g/mol) / (0.1 kg) = 0.616 m.
The molality of a solution if a chemist adds 3.6 grams of sodium chloride to 100.0 g of water is 0.615m.
What is molality?Molality is defined as the no. of moles of solute dissolved in a 1.0 kg of the solvent.
m = no. of moles of solute ÷ mass of the solvent (kg)
no of moles of NaCl = 3.6g ÷ 58.5g/mol = 0.0615mol
Molality = 0.0615mol ÷ 0.1kg
Molality = 0.615m
Therefore, the molality of a solution if a chemist adds 3.6 grams of sodium chloride to 100.0 g of water is 0.615m.
Learn more about molality at: https://brainly.com/question/12127540
How is the equilibrium constant of a reaction determined?
Answer:
The molarity of products is divided by the molarity of reactants.
Explanation:
Which of the following conditions remain constant in Gay-Lussac's law? Temperature and number of moles Volume and number of moles Density and temperature Volume and pressure
Answer:
Volume and number of moles.
Explanation:
Gay-Lussac's law was found by Joseph Louis Gay-Lussac in 1808. It states that, for a given mass (no. of moles) and constant volume of an ideal gas, the pressure exerted on the sides of its container is directly proportional to its absolute temperature.So, no. of moles and V are constant.
P ∝ T,
∴ P1/T1 = P2/T2.
So, the right choice is: Volume and number of moles.Answer:
Volume and Number of Moles
Explanation:
I hope this helps !! :)
Hydrogen gas has a density of , and at normal pressure and one mole of it takes up . how would you calculate the moles in of hydrogen gas? set the math up. but don't do any of it. just leave your answer as a math expression. also, be sure your answer includes all the correct unit symbols.
To calculate the moles in 5L of hydrogen gas at STP, divide the volume in liters by the volume occupied by one mole of any gas at STP, which is 22.4 L/mol.
To calculate the number of moles in 5L of hydrogen gas at standard temperature and pressure (STP), you can apply the ideal gas law. To set up the calculation, use that at STP, 1 mole of a gas occupies 22.4 L. Use the following mathematical expression for your conversion:
Number of moles = Volume of gas (L) / Volume of 1 mole at STP (L/mol)
For your specific question:
Number of moles of H2 = 5 L / 22.4 L/mol
Make sure to leave your answer as a math expression with the correct units of L for liters and mol for moles.
Base your answer to this question on the information below.During a bread-making process, glucose is converted to ethanol and carbon dioxide, causing the bread dough to rise. Zymase, an enzyme produced by yeast, is a catalyst needed for this reaction.Choose the correct structural formula for the alcohol formed in this reaction.
Answer: 1 C6H12O6===> 2 C2H5OH + 2 CO2
75 In the space in your answer booklet, draw a structural formula for the alcohol formed in this reaction. [1]
Explanation:
The correct structural formula for the alcohol formed in this reaction [tex]CH_3-CH_2-OH[/tex] is also called ethanol.
What is alcohol?Alcohol is any of a class of organic compounds characterized by one or more hydroxyl (―OH) groups attached to a carbon atom of an alkyl group (hydrocarbon chain).
Ethanol is simple alcohol produced via the fermentation of sugars (such as glucose, fructose, and sucrose) by yeasts because yeasts do this conversion in the absence of oxygen.
The correct structural formula for the alcohol formed in this reaction [tex]CH_3-CH_2-OH[/tex] is also called ethanol.
Learn more about the alcohol here:
https://brainly.com/question/4698220
#SPJ2
Diamonds are mostly composed of what element?
Answer:
Diamonds are composed almost entirely of the element carbon, often with some other impurities in them, such as nitrogen (i.e., pure diamonds are entirely carbon). The element carbon comes in three different natural forms, or allotropes: diamond, graphite, and amorphous.
Explanation:
Chemistry help??
A student increases the temperature of a 100 cm3 balloon from 60°C to 120°C. What will the new volume of the balloon be? (Be careful with units.)
(a) 118 cm3
(b) 200 cm3
(c) 236 cm3
(d) 400 cm3
Final answer:
OPTION A.
Using Charles's Law, the temperature of the balloon is converted to Kelvin and the law is applied to find the new volume when the temperature is increased from 60°C to 120°C. The new volume is approximately 118 cm³.
Explanation:
The question involves applying Charles's Law, which states that the volume of a gas is directly proportional to its temperature when pressure is constant. To find the new volume after an increase in temperature, we convert the temperatures from Celsius to Kelvin by adding 273. The initial temperature (T1) is thus 60°C + 273 = 333K and the final temperature (T2) is 120°C + 273 = 393K. The initial volume (V1) is 100 cm³.
Charles's Law is given by the formula V1/T1 = V2/T2, where V2 is the final volume. Applying this formula, we get:
V1/T1 = V2/T2
(100 cm³) / (333K) = V2 / (393K)
Multiplying both sides by 393K, we find the final volume V2:
V2 = (100 cm³) * (393K) / (333K)
This results in:
V2 ≈ 118 cm³
Therefore, the new volume of the balloon, after increasing the temperature from 60°C to 120°C, will be approximately 118 cm³.
Plastic is made from ____. a leachates produced by bioenzymes b melted silica sand grains c byproducts of coal mining d extraction of inorganic solids oil and natural gas e organic molecules derived from oil and natural gas
Answer:
plastic is made from polymers.
What change will be caused by addition of a small amount of hcl to a solution containing fluoride ions and hydrogen fluoride?
Answer:
The addition of a small amount of HCl to a solution containing fluoride ions and hydrogen fluoride will cause the equilibrium shift to the production of more hydrogen fluoride.Explanation:
The solution containing fluoride ions and hydrogen fluoride (a weak acid) may be chemically represented by this equilibrium equation:
F⁻ (aq) + H⁺ (aq) ⇄ HF (aq)The HCl, a strong acid, added will ionize in water according to this chemical equation:
HCl (aq) → H⁺ (aq) + Cl⁻ (aq)Then, following Le Chatelir's principle, the addtion of H⁺ ions coming from the HCl dissociation, will increase the concentration of H⁺ in the solution, driving to the consumption of some F⁻ ions, and the production of more HF acid. This is a shift of the equilbrium toward the HF side.
Adding hydrochloric acid to a solution of fluoride ions and hydrogen fluoride will decrease the pH and increase the concentration of hydrofluoric acid while decreasing the concentration of fluoride ions.
When hydrochloric acid (HCl) is added to a solution containing fluoride ions and hydrogen fluoride, it will cause a decrease in the pH of the solution. This is because HCl is a strong acid and it will dissociate completely in water to release hydronium ions (H3O+), resulting in an increase in the solution's acidity. Furthermore, according to Le Chatelier's principle, the addition of HCl will push the equilibrium of the reaction:
HF(aq) + H2O(l) ⇌ H3O+(aq) + F¯(aq)
to the left, meaning that the concentration of hydrofluoric acid (HF) will increase, while the concentration of fluoride ions (F−) will decrease, due to the additional supply of common ions from HCl.
How many moles of aluminum are needed to react completely with 1.2 mol of feo
Answer:
0.8 mol.
Explanation:
The balanced equation for the reaction between Al and FeO is represented as:2Al + 3FeO → 3Fe + Al₂O₃,
It is clear that 2 mol of Al react with 3 mol of FeO to produce 3 mol of Fe and 1 mol of Al₂O₃.
Using cross multiplication:
2 mol of Al needs → 3 mol of FeO, from stichiometry.
??? mol of Al needs → 1.2 mol of FeO.
∴ The no. of moles of Al are needed to react completely with 1.2 mol of FeO = (2 mol)(1.2 mol)/(3 mol) = 0.8 mol.
Considering the reaction stoichiometry, 0.8 moles of aluminum are needed to react completely with 1.2 moles of FeO.
The balanced reaction is:
2 Al + 3 FeO → 3 Fe + Al₂O₃
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Al: 2 moles FeO: 3 moles Fe: 3 moles Al₂O₃: 1 moleThen you can apply the following rule of three: if by stoichiometry 3 moles of FeO react with 2 moles of Al, 1.2 moles of FeO react with how many moles of Al?
[tex]amount of moles of Al= \frac{1.2 moles of FeOx2 moles of Al}{3 moles of FeO}[/tex]
amount of moles of Al= 0.8 moles
Finally, 0.8 moles of aluminum are needed to react completely with 1.2 moles of FeO.
Learn more with this similar problems:
brainly.com/question/16487206?referrer=searchResults
brainly.com/question/14446695?referrer=searchResults
brainly.com/question/11564309?referrer=searchResults
brainly.com/question/4025026?referrer=searchResults
brainly.com/question/18650135?referrer=searchResults
What is the oxidation number of Mn in MnO2?
2
3
4
1
Mn’s oxidation number is +4 because the overall compound is neutral/has a 0 charge. So since O always has a -2 oxidation number except in special cases (ex: H2O2) and since oxidation numbers add up to the compound’s charge, x + -2(2) = 0 which means x = 4. thus the oxidation number is 4.
Final answer:
The oxidation number of Mn in MnO2 is +4. This is determined by balancing the total negative charge of -4 from the two oxygen atoms with the positive charge from manganese which must balance to zero in a neutral compound.
Explanation:
The oxidation number of Mn in MnO2 is +4. When determining oxidation numbers, remember that the sum of oxidation numbers in a neutral compound must equal zero. Since each oxygen atom has an oxidation number of -2, and there are two oxygen atoms totaling -4, manganese must have an oxidation number of +4 to balance the charge.
MnO2 is manganese(IV) oxide, indicating that manganese is in the +4 oxidation state. The formula reflects that there are four total electrons that have been transferred to oxygen atoms in this compound, making it less paramagnetic than when manganese is in the +3 state, as seen in manganese(III) oxide, Mn2O3.
How is the equilibrium constant of a reaction determined
Answer:
It is given by the concentration of the products divided by the concentration of the reactants
Hydrochloric acid is a strong acid that is diprotic. True or false?
Answer:
False.
Correction: Hydrochloric acid is a strong acid that is monoprotic.
Explanation:
Hydrochloric acid is a strong acid because it is completely dissociated to its ions in the solution.But it is a monoprotic acid because it produces 1 mol of H⁺ when it is dissociated. according to the reaction:HCl → H⁺ + Cl⁻.
So, the answer is: False.
And the correction is:
Hydrochloric acid is a strong acid that is monoprotic.
A thermally isolated system is made up of a hot piece of aluminum and a cold piece of copper; the aluminum and the copper are in thermal contact. The specific heat of aluminum is more than double that of copper. Which object experiences the greater temperature change during the time the system takes to reach thermal equilibrium?
Answer:
Copper is the object that experiences the greater temperature change.Explanation:
Thermally isolated system means that the system does not exchange thermal energy with the surroundings.
Hence, any thermal exchange, in virtue of the temperature difference of the aluminum and copper pieces, is between them.
In consequence, the law of conservation of energy states that the heat lost by the hot substance will be gained by the cold matter.
In equations, that is:
Heat lost by aluminum = heat gained by copper.Now, the gain or loss or heat of a substance, Q, is related with the mass (m), the specific heat (Cs), and the cahnge of temperature (ΔT), per the equation:
Q = m × Cs × ΔT∴ Q lost by aluminum = Q gained copper ⇒
[m × Cs × ΔT ] aluminum = [m × Cs × ΔT ] copper.Under the reasoning assumption that the masses of aluminum and copper are equal, the equations is simplified to:
[Cs × ΔT ] aluminum = [Cs × ΔT ] copper.Cs aluminum / Cs copper = ΔT copper / ΔT aluminumCs aluminum > 2 × Cs copper ⇒ Cs Cs aluminum / Cs copper > 2 ΔT copper / ΔT aluminumΔT copper / ΔT aluminum > 2 ΔT copper > 2 × ΔT aluminumIn words, since it is stated that the specific heat of aluminum is more than double that of copper, in order to keep the equality, ΔT of copper shall be more than double ΔT of aluminum.
Hence, the conclusion is that the object that experiences the greater temperature change is copper (the one with the lower specific heat), under the assumption that both objects have the same amount of matter (mass).
In the thermally isolated system, the copper experiences a greater temperature change than the aluminum because copper has a lower specific heat. It means that copper requires less energy to change its temperature compared to aluminum.
Explanation:In a thermally isolated system like the one you've asked about, energy isn't gained or lost, but it does transfer among parts of the system until all parts are at the same temperature, which we call thermal equilibrium. Given that copper has a lower specific heat than aluminum, the same amount of heat transfer will cause a larger temperature change in the copper. This is due to the way specific heat works: substances with higher specific heat require more energy to change their temperature, while those with lower specific heat require less.
It's like running a race: if the specific heat is the distance of the race, the runner (or heat energy) with a shorter race (lower specific heat) will finish (change temperature) more quickly than a runner with a longer race (higher specific heat).
How Specific Heat Affects Temperature ChangeSpecific heat is the amount of heat per unit mass required to raise the temperature of a substance by one degree Celsius. In this case, the aluminum, with a higher specific heat, would need more energy (heat) to alter its temperature. Since the energy is transferred from the aluminum (hot) to the copper (cold), the copper, with a lower specific heat, experiences more temperature change until thermal equilibrium is reached.
Learn more about Thermal Equilibrium here:https://brainly.com/question/31270337
#SPJ11
Why is water considered the universal solvent
Because of its high solubility, water is considered to be a universal solvent.
What is a universal solvent?
A substance that displaces most compounds is known as a universal solvent. Because it dissolves more chemicals than any other solvent, water is known as the universal solvent. But no solvent, not even water, can dissolve all chemicals. According to the principle of "like dissolves like," polar solvents typically dissolve polar compounds, such as salts.
Nonpolar solvents may dissolve organic molecules like lipids and other nonpolar substances. Because of its polar nature, which gives each molecule a hydrophobic (water-fearing) and hydrophilic (water-loving) side, water dissolves more compounds than any other solvent.
The oxygen atom has a tiny negative electrical charge, whereas the side of the molecules with two hydrogen atoms carries a slight positive electrical charge. Water's polarisation makes it possible for it to draw in a wide variety of molecules. Water is able to split the substance into its ions due to the strong attraction to ionic molecules like sodium chloride or salt.
Therefore, water is considered a universal solvent.
Read more about water, here
https://brainly.com/question/28465561
#SPJ2
Which type of substance ionizes completely and creates hydronium ions when dissolved in water?
Answer:
Strong acids.
Explanation:
Acid is a substance that produces hydronium ions (H₃O⁺) when dissolved in water. Acids have a pH less than 7.The degree of hydronium ions (H₃O⁺) depends on the strength of the acid.Strong acids are completely ionized and produce hydronium ions (H₃O⁺).HA + H₂O → H₃O⁺ + A⁻.
Weak acids are partially ionized and produce hydronium ions (H₃O⁺).
HA + H₂O ⇄ H₃O⁺ + A⁻.
Answer: strong acids
Explanation: for one the substance dissolves completely and acids only produce hydronium ions just like acids produce hydroxide ions.
Hydrazine (N2H4), a rocket fuel , reacts with oxygen to form nitrogen gas and water vapor. The reaction is represented with the equation:
N2H4(l) + O2(g) → N2(g) + 2H2O(g)
At STP, if 4.20L of O2 reacts with N2H4, how many liters of water vapor will be produced?
A)
2.10L H2O(g)
B)
2.67L H2O(g)
C)
5.33L H2O(g)
D)
8.40L H2O(g)
Answer:
D) 8.40 L H₂O(g).
Explanation:
The balanced equation for the mentioned reaction is:2N₂H₄(l) + O₂(g) → N₂(g) + 2H₂O(g),
It is clear that 2.0 moles of N₂H₄ react with 1.0 mole of O₂ to produce 2.0 moles of N₂ and 2.0 moles of H₂O.
At STP, 4.20L of O₂ reacts with N₂H₄:
It is known that at STP: every 1.0 mol of any gas occupies 22.4 L.
using cross multiplication:
1.0 mol of O₂ represents → 22.4 L.
??? mol of O₂ represents → 4.2 L.
∴ 4.2 L of O₂ represents = (1.0 mol)(4.2 L)/(22.4 L) = 0.1875 mol.
To find the no. of moles of H₂O produced:Using cross multiplication:
1.0 mol of O₂ produce → 2.0 mol of H₂O, from stichiometry.
0.1875 mol of O₂ produce → ??? mol of H₂O.
∴ The no. of moles of H₂O = (2.0 mol)(0.1875 mol)/(1.0 mol) = 3.75 mol.
Again, using cross multiplication:1.0 mol of H₂O represents → 22.4 L, at STP.
3.75 mol of H₂O represents → ??? L.
∴ The no. of liters of water vapor will be produced = (3.75 mol)(22.4 L)/(1.0 mol) = 8.4 L.
So, the right choice is: D) 8.40 L H₂O(g).
Final answer:
Using the balanced chemical equation, stoichiometry, and Avogadro's law, we determine that if 4.20 liters of O₂ reacts, it will produce 8.40 liters of H₂O vapor. The correct answer is 8.40L of H₂O vapor.
Explanation:
The question involves a stoichiometric calculation based on the balanced chemical equation for the reaction between hydrazine (N₂H₄) and oxygen (O₂) to produce nitrogen gas (N₂) and water vapor (H₂O). At STP (standard temperature and pressure), one mole of any gas occupies 22.4 liters. According to the balanced chemical equation:
N₂H₄(l) + O₂(g) ⇒N₂(g) + 2H₂O(g)
We can see that 1 mole of O₂ reacts with 1 mole of N₂H₄ to produce 2 moles of H₂O. If 4.20 liters of O₂ are reacted, we can use Avogadro's law to determine the volume of H₂O produced, which will be twice the volume of O₂ reacted because of the 1:2 molar ratio. Therefore, the volume of water vapor produced will be:
4.20 L O₂(g) x (2 moles H₂O / 1 mole O₂) = 8.40 L H₂O(g)
The correct answer is 8.40 L H₂O(g), which corresponds to option D.
Which equation shows how to calculate how many grams (g) of Mg(OH)2 would be produced from 4mol KOH? The balanced reaction is:
MgCl2(small 2) + 2KOH -----> Mg(OH)2(small2) + 2KCL
Answer:
4 mol of KOH would produce 116.6 g of Mg(OH)₂
Explanation:
According to the following balanced equation:
MgCl₂+ 2 KOH -----> Mg(OH)₂ + 2 KCLOne can note that 2 mol of KOH react with MgCl₂ to produce 1 mol of Mg(OH)₂.
using cross multiplication
2 mol of KOH → 1 mol of Mg(OH)₂.
4 mol of KOH → ?? mol of Mg(OH)₂.
no of moles of Mg(OH)₂ = (1 mol* 4 mol) / 2 mol =2 mol
Now we can convert moles of Mg(OH)₂ to grams using the formula
mass of Mg(OH)₂= (no. of moles * molar mass) = (2 mol * 58.3g/mol) = 116.6 g
So, 4 mol of KOH would produce 116.6 g of Mg(OH)₂.Assuming equal concentrations and complete dissociation, rank these aqueous solutions by their freezing points.
Li_2SO_4 NH_4l CoCl_3
Highest freezing point Lowest freezing point
Answer:
CoCl₃ > Li₂SO₄ > NH₄I.
Explanation:
Adding solute to water causes depression of the boiling point.The depression in freezing point (ΔTf) can be calculated using the relation:ΔTf = i.Kf.m,
where, ΔTf is the depression in freezing point.
i is the van 't Hoff factor.
van 't Hoff factor is the ratio between the actual concentration of particles produced when the substance is dissolved and the concentration of a substance as calculated from its mass. For most non-electrolytes dissolved in water, the van 't Hoff factor is essentially 1.Kf is the molal depression constant of water.
m is the molality of the solution.
(1) Li₂SO₄:
i for Li₂SO₄ = no. of particles produced when the substance is dissolved/no. of original particle = 3/1 = 3.
∴ ΔTb for (Li₂SO₄) = i.Kb.m = (3)(Kf)(m) = 3(Kf)(m).
(2) NH₄I:
i for NH₄I = no. of particles produced when the substance is dissolved/no. of original particle = 2/1 = 2.
∴ ΔTb for (NH₄I) = i.Kb.m = (2)(Kf)(m) = 2(Kf)(m).
(3) CoCl₃:
i for CoCl₃ = no. of particles produced when the substance is dissolved/no. of original particle = 4/1 = 4.
∴ ΔTb for (CoCl₃) = i.Kb.m = (4)(Kf)(m) = 4(Kf)(m).
So, the ranking of the freezing point from the highest to the lowest is:CoCl₃ > Li₂SO₄ > NH₄I.
Final answer:
The aqueous solutions ranked from highest to lowest freezing point, based on the number of ions they produce upon dissociation, is NH4I (highest freezing point), followed by Li2SO4, and then CoCl3 (lowest freezing point).
Explanation:
To rank aqueous solutions by their freezing points when they have equal concentrations and are completely dissociated, we look at the number of ions each compound dissociates into when dissolved. The more ions produced, the lower the freezing point of the solution due to a greater freezing point depression effect. The given solutions are Li2SO4, NH4I, and CoCl3. Li2SO4 dissociates into 3 ions (2 Li+ + SO42-), NH4I dissociates into 2 ions (NH4+ + I-), and CoCl3 dissociates into 4 ions (Co3+ + 3 Cl-). Therefore, the order from highest to lowest freezing point is: NH4I > Li2SO4 > CoCl3.
A container holds a pure sample of a radioactive substance with a half-life of 2 hours. Which of the following statements are true?
a) After 1 hour, less than 50 % of the original atoms in the container will have decayed.
b) After 1 hour, more than 50 % of the original atoms in the container will have decayed.
c) After 2 hours, 50 % of the original atoms in the container will have decayed.
d) After 4 hours, 25 % of the original atoms will have decayed.
e) After 4 hours, the total number of atoms in the container will be reduced by 75 %.
A container holds a pure sample of a radioactive substance with a half-life of 2 hours. The true statements are a, c and d.
a) After 1 hour, less than 50 % of the original atoms in the container will have decayed.
True. The half-life of the radioactive substance is 2 hours, which means that after 1 hour, only half of the original atoms would have decayed. Therefore, less than 50% of the original atoms will have decayed.
b) After 1 hour, more than 50 % of the original atoms in the container will have decayed.
False. As explained in statement (a), after 1 hour, less than 50% of the original atoms will have decayed, not more than 50%.
c) After 2 hours, 50 % of the original atoms in the container will have decayed.
True. The half-life of the radioactive substance is 2 hours, so after 2 hours, exactly 50% of the original atoms will have decayed.
d) After 4 hours, 25 % of the original atoms will have decayed.
True. Since the half-life is 2 hours, after 4 hours (2 half-lives), 50% of the original atoms will have decayed. Therefore, 25% of the original atoms will remain after 4 hours.
e) After 4 hours, the total number of atoms in the container will be reduced by 75 %.
False. After 4 hours, as explained in statement (d), 25% of the original atoms will remain, not 75%. So, the total number of atoms will be reduced by 100% - 25% = 75%, not 75%.
Correct statements: a), c), and d).
Learn more about radioactive substance from the link given below.
https://brainly.com/question/32852085
#SPJ2
What kind of weather would an occluded front likely bring?
a.
sunny and warm
c.
thunderstorms
b.
much precipitation
d.
cold and dry
Answer:
The answer is b. much precipitation
Explanation:
A front is a strip in which two air masses of different temperatures are separated. An occluded front occurs when a cold front that generally moves more quickly reaches a hot front and merges. The cold air mass, being heavier, stays below, forcing the warmer to rise. When this happens it cools and condenses, causing heavy precipitation.
The occluded fronts cause weak and continuous rains at first with stratiform-type clouds, and later the rains intensify with the arrival of vertically developing clouds, which cause storms.
Answer:
The answer is B.
Explanation:
Which volume of 2.0 M NaOH(aq) is needed to completely neutralize 24 milliliters of 1.0 M HCl(aq)?
Answer:
12mLd
Explanation:
Given parameters:
Concentration of base, NaOH = 2.0M
Volume of acid, HCl = 24mL = 24 x 10⁻³L = 0.024L
Concentration of HCl = 1.0M
Unknown parameter
Volume of NaOH = ?
The equation of the reaction is NaOH + HCl → NaCl + H₂O
Method
1. Starting the known values, we find the number of moles of acid used. From the reaction equation , we know that:
1 mole of NaOH reacts with 1 mole of HCl
We use the above to find the number of moles of base used
2. From the number of moles of base, we plug it into the equation below:
Volume of NaOH = [tex]\frac{number of moles of NaOH}{concentration of NaOH}[/tex]
Solution
Number of moles of acid = concentration of acid x volume of acid
Number of moles = 1M x 0.024L = 0.024mol
From the balanced equation we know that:
1 mole of NaOH reacts with 1 mole of HCl
Therefore, the number of moles of NaOH is 0.024mol
Using the equation below, we have:
Volume of NaOH = [tex]\frac{number of moles of NaOH}{concentration of NaOH}[/tex]
Volume of NaoH = [tex]\frac{0.024mol}{2.0M}[/tex]
Volume of NaOH = 0.012L = 12mL