Answer:
The right answer is A
Explanation:
What is the first step in the refining of petroleum?
Answer:
the first step is distillation
Explanation:
It would be expected that methanol (ch3oh) would be more soluble in water than methane (ch4) would be.
a. True
b. False
Methanol is soluble in water because it can form hydrogen bonds with water molecules. Methane is not able to form hydrogen bond in water and it exists in gas phase.
What is methanol?Methanol is an organic compound classified as an alcohol. Its formula is CH₃OH. Methanol is usually used in beverages as common alcohol and it is toxic and injurious to health.
Methanol is polar in nature and polar compounds easily dissolves in polar solvents such as water. The OH group in methanol bonds with H+ ends in water and this string hydrogen bond make it soluble in water.
Methane on the other hand is an organic gas, which does not have free H+ OH- groups to form hydrogen bonds with water and likely be insoluble in water.
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In the reaction Mg(s) + 2H2O(l) Mg(OH)2(s) + H2(g), what is the oxidation state of each H in H2(g)?
A. 0
B. +2 and –2
C. +1
D. –1 and +1
Answer:0
Explanation:
Which of the following is not an acid-base neutralization reaction?
NH3 + HCl yields NH4Cl
H2 + Br2 yields 2 HBr
HCl + HBr yields H2 + ClBr
2 HBr + Ca(OH)2 yields CaBr2 + 2 H2O
Calculate the molarity of a solution containing 0.2 mol nh4br in exactly 200 ml solution
Why is the law of definite proportions important?
Which is the correct standard notation for 9.3 × 10^5?
a.9,300
b.93,000
c.930,000
d.9,300,000
(yes this is chemistry related)
Answer : The correct answer is, (C) 930000
Explanation :
Scientific notation : It is the representation of expressing the numbers that are too big or too small and are represented in the decimal form with one digit before the decimal point times 10 raise to the power.
For example :
5000 is written as [tex]5.0\times 10^3[/tex]
889.9 is written as [tex]8.899\times 10^{-2}[/tex]
In this examples, 5000 and 889.9 are written in the standard notation and [tex]5.0\times 10^3[/tex] and [tex]8.899\times 10^{-2}[/tex] are written in the scientific notation.
[tex]8.89\times 10^{-2}[/tex] this is written in the scientific notation and the standard notation of this number will be, 0.00889.
If the decimal is shifting to right side, the power of 10 is negative and if the decimal is shifting to left side, the power of 10 is positive.
As we are given the [tex]9.3\times 10^5[/tex] in scientific notation.
Now converting this into standard notation, we get:
[tex]\Rightarrow 9.3\times 10^5=930000[/tex]
Hence, the correct answer is, (C) 930000
A student places three ice cubes in a beaker and allows them to partially melt. if she measures the temperature of the water in the beaker, what will she most likely observe? explain your answer.
Temperature does not change during melting because the heat absorbed is used to overcome intermolecular forces rather than to increase the kinetic energy of the particles.
As long as both ice and water are present in the beaker, the temperature of the water will not increase.
The freezing point of water is 0°C (273 K).
The water's temperature should be 0°C (273 K).
When carrying out the experiment of putting three ice cubes in a beaker and letting them partially melt, the student will observe that when measuring the temperature, it will not change during the melting of the ice.
Physical States of WaterIt corresponds to the water cycle in nature, that is, the processes of water transformation, through:
FusionVaporizationSolidificationLiquefactionSublimationTherefore, there are two laws that determine fusion, which are related to a pure and crystalline substance under a certain pressure will not change its temperature and will remain constant.
This is because the heat absorbed is not used to increase the kinetic energy of the particles, but to overcome the forces of interaction between the molecules.
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Calcium chloride (cacl2) is an ionic compound that dissociates in water. a chemist forms a solution by mixing 0.50 mol cacl2 and 1.0 kg of water. how many moles of ions are in the solution?
Calcium chloride (CaCl2) is a salt which dissociates when dissolved in water. Assuming that the dissociation is complete (100 %), then the half reaction for this would be:
CaCl2 ---> Ca2+ + 2 Cl-
We can see that in 1 mole of CaCl2 salt, 1 mole of Ca2+ ion and 2 moles of Cl- ion is created. Therefore there are 3 moles of ion per 1 mole of CaCl2. Using this ratio, the total number of moles of ions in the solution is:
Total number of ions = 0.5 mol CaCl2 * (3 moles ion / 1 mol CaCl2)
Total number of ions = 1.5 moles ion
Answer:
1.5 mol ions
Explanation:
Which structure shows the correct electron arrangement in CCl4?
Answer : The figure is attached in the attachment.
Explanation : The central atom will be carbon to which at 109.8 degrees will be each chlorine atoms. And the central carbon atom is [tex] SP^{3}[/tex] hybridized. There will be four chlorine atom surrounding the central carbon atom. There will be 3 lone pairs of electron on each of the chlorine atom which gets attached with carbon atom.
The Lewis structure shows the electrons in a molecule.
The Lewis structure of a molecule shows the number of electrons in the molecule. The unshared electrons are shown as dots while the shared electrons may be showed as a single dash.
The correct Lewis structure of CCl4 is shown in the image attached to this answer.
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Which of the following best predicts the outcome of a fusion reaction involving isotopes of hydrogen?
Two hydrogen isotopes form bonds with each other, absorbing a large amount of energy.
The nuclei of the hydrogen isotopes join together to form a heavier element, and energy is released.
Isotopes of hydrogen absorb electrons, undergo an increase in energy level, and split into fragments.
The nuclei of the hydrogen isotopes split, resulting in smaller fragments and the release of a large amount of energy.
Explain why a model of the atom is crucial to understanding chemistry and in explaining the behavior of matter. Please, do not answer it fully but please explain it out and help me understand! thank you
How many carbon atoms are found in a molecule of 2-methyl-3-nonene? 8 9 10 11
Wine goes bad soon after opening because the ethanol ch3ch2oh in it reacts with oxygen gas o2 from the air to form water h2o and acetic acid ch3cooh , the main ingredient of vinegar. what mass of ethanol is consumed by the reaction of 3.84g of oxygen gas? be sure your answer has the correct number of significant digits.
What atomic or hybrid orbitals make up the sigma bond between c1 and c2 in tetrafluoroethylene, c2f4?
The atomic or hybrid orbitals that make up the sigma bond between C1 and C2 in tetrafluoroethylene, C2F4 are the sp2 hybrid orbitals. Tetrafluoroethylene C2F4 has double bond between C1 and C2. So, sigma bond is made sp2hybrid orbitals.
To add, the simplest perfluorinated alkene, Tetrafluoroethylene belongs to the family of fluorocarbons.
Answer:
hybrid sp2 -orbital make up the sigma bond between C1 and C2 in tetrafluoroethylene
Explanation:
The tetrafluoroethylene has a double bond between the carbons and single bonds between each fluor and carbon because each carbon requires a full octet and each fluor requires a pair of electrons.
In chemistry, hybridization is the interaction of atomic orbitals within an atom to form new hybrid orbitals. In sp2 hybridization, an s orbital and two orbitals are combined p. For this hybridization to occur, the carbon must be attached to three atoms as is the case in the carbon atom in this case. On the other hand, the sigma bond (σ) is formed when there is a front overlap of atomic orbitals; and the pi (π) bond is formed when there is superposition of parallel p orbitals.
Atoms that form sp2 hybridizations can form compounds with double bonds, as in this case between both carbons. Simple bonds are known as sigma bons (σ) and double bonds are composed of a sigma bond and a pi bond. So double bond between sp2 hybrid orbitals formed by one sigma-bond and one pi-bond.
In summary, hybrid sp2-orbital make up the sigma bond between C1 and C2 in tetrafluoroethylene
The solubility product for barium sulfate is 1.1 × 10–10. calculate the molar solubility of barium sulfate.
the molar solubility of Barium Sulfate is 1.05 × 10⁻⁵ mol/L.
The correct option is (b).
The solubility product (Ksp) for Barium Sulfate (BaSO₄) is given as 1.1 × 10⁻¹⁰. The solubility product is the equilibrium constant representing the relationship between the concentrations of the ions in the saturated solution:
BaSO₄(s) ⇌ Ba²⁺(aq) + SO₄²⁻(aq)
To calculate the molar solubility (S) for BaSO₄, we need to find the concentration of Ba²⁺ and SO₄²⁻ ions at equilibrium. Since Ksp is given, we can use the definition of the solubility product:
Ksp = [Ba²⁺] × [SO₄²⁻]²
We don't have the individual ion concentrations but can find the total molar solubility (Sₙ) by taking the square root of the solubility product:
Sₙ = √(Ksp) = √(1.1 × 10⁻¹⁰) = 1.05 × 10⁻⁵ mol/L
So, the molar solubility of Barium Sulfate is 1.05 × 10⁻⁵ mol/L.
complete question given below:
The solubility product for barium sulfate is 1.1*10⁻¹⁰. Calculate the molar solubility of barium sulfate.
1) 5.5*10⁻⁸ mol/L
2) 1.05 *10⁻⁵ mol/L
3) 2.1*10⁻⁵ mol/L
4) 1.1*10⁻¹⁰ mol/L
5) 2.2*10⁻¹⁰ mol/L
When a pair of electrons is shared equally between two atoms, the bond formed is called a(n):?
Determine the ph of a 0.00598 m hclo4 solution. 1.777 6.434 7.566 2.223 3.558
The correct pH of a 0.00598 M [tex]HClO_4[/tex] solution is approximately 2.223.
To determine the pH of a 0.00598 M [tex]HClO_4[/tex] solution, we can use the fact that [tex]HClO_4[/tex] is a strong acid and dissociates completely in water. Therefore, the concentration of H+ ions in the solution will be equal to the concentration of the acid.
Given that the concentration of [tex]HClO_4[/tex] is 0.00598 M, the concentration of H+ ions will also be 0.00598 M. The pH of a solution is defined as the negative logarithm (base 10) of the [tex]H^+[/tex] ion concentration:
[tex]\[ \text{pH} = -\log[H^+] \][/tex]
Substituting the concentration of H+ ions into the equation, we get:
[tex]\[ \text{pH} = -\log(0.00598) \][/tex]
Using a calculator to find the logarithm and then the negative of that value, we obtain:
[tex]\[ \text{pH} \approx 2.223 \][/tex]
This is the most accurate value among the given options, and it corresponds to the pH of the solution. The other options (1.777, 6.434, 7.566, and 3.558) do not accurately represent the pH of a 0.00598 M [tex]HClO_4[/tex] solution.
Brainliest if answered in the next 5m
When the Ka value is very large, the _________ are favored over the _______.
Reactants
Products
In order to buffer a strong acid into a weak acid, which has a less dramatic effect on ph, what chemical should be used as the buffer?
In order to buffer a strong acid into a weak acid, salt of strong acid should be used as the buffer.
What are acids?
Acids are defined as substances which on dissociation yield H+ ions , and these substances are sour in taste. Compounds such as HCl, H₂SO₄ and HNO₃ are acids as they yield H+ ions on dissociation.
According to the number of H+ ions which are generated on dissociation acids are classified as mono-protic , di-protic ,tri-protic and polyprotic acids depending on the number of protons which are liberated on dissociation.
Acids are widely used in industries for production of fertilizers, detergents batteries and dyes.They are used in chemical industries for production of chemical compounds like salts which are produced by neutralization reactions.
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Name a common greenhouse gas containing only hydrogen and oxygen
How many electrons potassium isotope with 19 protons and 22 neutrons?
What type of energy is stored for use at a later time? Bond energy Free energy Kinetic energy Potential energy
Why is it necessary to find the percent yield of a reaction?
A) to determine the efficiency of the reaction
B) to determine the amount of reactants in the reaction
C) to determine the amount of products in the reaction
D) to determine the limiting reactant of the reaction
The percent yield of a reaction is used to measure the efficiency of a given chemical reaction. It signifies how effectively the reactants have been converted to products. It does not directly indicate the number of reactants, products, or the limiting reactant.
Explanation:The purpose of finding the percent yield of a chemical reaction is primarily to determine the efficiency of the reaction. The term 'percent yield' represents the ratio of the actual yield (the amount of product actually generated in a reaction) to the theoretical yield (the maximum amount of product that could potentially be generated) multiplied by 100.
It does not directly allow us to determine the number of reactants or products, nor the limiting reactant of the reaction; its purpose rather is to assess how effectively the reactants have been converted into products. A high percent yield, close to 100%, means that the reaction was very efficient with little waste or side reactions taking place.
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What is the mass of 4.91 x10^21 platinum atoms?
To calculate the mass, go from atoms to moles and moles to grams:
Atoms ........ Moles.......... Grams
From atoms to moles, use the Avogadro’s no. which is 6.022 x 10^23 and from moles to grams use atomic mass of Pt that is 195.08g.
So, 4.91 x 10^21 Pt atoms x (1 mole Pt / 6.022x10^23 Pt atoms) x (195.08g Pt / 1 mole Pt) = 1.59g Pt
Mass of 4.91 x 10^21 Pt atoms = 1.59g Pt
The mass of [tex]4.91 \times {10^{21}}{\text{ platinum atoms}}[/tex] is [tex]\boxed{1.59{\text{ g}}}[/tex].
Further Explanation:
We are provided with atoms of platinum and its mass is to be calculated. For this, first of all atoms of Pt are to be converted into moles. This is done with the help of Avogadro’s law. According to Avogadro’s law, one mole of any substance contains [tex]6.022 \times {10^{23}}{\text{ units}}[/tex]. Such units can be atoms and molecules.
Since [tex]6.022 \times {10^{23}}[/tex] of platinum consist of one mole, number of moles that are present in [tex]4.91 \times {10^{21}}{\text{ atoms}}[/tex] can be calculated as follows:
[tex]\begin{aligned}{\text{Moles of Pt}} &= \left( {4.91 \times {{10}^{21}}{\text{ atoms}}} \right)\left( {\frac{{1{\text{ mol}}}}{{6.022 \times {{10}^{23}}{\text{ atoms}}}}} \right) \\&= 0.008153{\text{ mol}} \\\end{aligned}[/tex]
Now moles calculated in above step are used to proceed for further calculations of mass. Moles and mass of Pt are related to each other with the help of expression written below.
The formula to calculate moles of Pt is as follows:
[tex]{\text{Moles of Pt}} = \dfrac{{{\text{Mass of Pt}}}}{{{\text{Molar mass of Pt}}}}[/tex] ……(1)
Rearrange equation (1) to calculate mass of Pt.
[tex]{\text{Mass of Pt}} = \left( {{\text{Moles of Pt}}} \right)\left( {{\text{Molar mass of Pt}}} \right)[/tex] …… (2)
The moles of Pt are0.008153 mol.
The molar mass of Pt is 195.084 g/mol.
Substitute these values in equation (2).
[tex]\begin{aligned}{\text{Mass of Pt}} &= \left( {{\text{0}}{\text{.008153 mol}}} \right)\left( {{\text{195}}{\text{.084 g/mol}}} \right)\\&= 1.59{\text{ g}} \\\end{aligned}[/tex]
Hence,mass of platinum comes out to be 1.59 g.
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Answer details:
Grade: Senior School
Subject: Chemistry
Chapter: Mole concept
Keywords: mole, atoms, Pt, platinum, moles of Pt, molar mass of Pt, 1.59 g, Avogadro’s law, 6.022*10^23 atoms, 4.91*10^21 atoms, mass of Pt, 195.084 g/mol, 0.008153 mol, mass of platinum.
According to the Kinetic Molecular Theory, as the volume of an enclosed gas increases:
the number of particle impacts per unit area increases
the temperature must change
the total number of particle impacts increase
the number of particle impacts per unit area decreases
The Kinetic Molecular Theory suggests that as the volume of an enclosed gas increases, the number of particle impacts per unit area decreases since the gas particles are more spread out.
Explanation:According to the Kinetic Molecular Theory, as the volume of an enclosed gas increases, the number of particle impacts per unit area decreases. The Kinetic Molecular Theory, a fundamental concept in gas physics, postulates that gas particles are in constant, random motion and that they frequently collide with each other and the walls of their container. When the volume of the container increases, the gas particles have more space to move around, the number of possible collision points increase but relatively the collisions with specific unit area decreases as the particles are more spread out. So the number of particle impacts per unit area decreases, not increases. The total number of particle impacts or the temperature does not necessarily have to change.
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[07.02]what is the concentration of a ca(oh)2 solution if 10.0 ml of 0.600 m h3po4 solution is required to completely neutralize 12.5 ml of the ca(oh)2 solution? 0.320 m 0.480 m 0.720 m 1.44 m
Convert 3.45 kilometers to micrometers.
3.45= 3,450,000,000 Im working on this at school rn I hope I helped
) write the balanced equation for the reaction that occurs when methanol, ch3oh (l), is burned in air. what is the coefficient of oxygen in the balanced equation
Answer : The coefficient used for the oxygen in balanced chemical reaction is, 3.
Explanation :
Balanced chemical reaction : It is defined as the number of atoms of individual elements present on reactant side must be equal to the product side.
When methanol is burned in air then it react to give carbon dioxide and water as a products.
The balanced chemical reaction will be,
[tex]2CH_3OH(l)+3O_2(g)\rightarrow 2CO_2(s)+4H_2O(g)[/tex]
This reaction is a combustion reaction in which a hydrocarbon react with oxygen to given carbon dioxide and water as a products.
By stoichiometry we can say that, 2 mole of methanol react with 3 moles of oxygen to give 2 moles of carbon dioxide and 4 moles of water.
Hence, from the balanced chemical reaction we conclude that the coefficient used for the oxygen is 3.
The balanced equation is:
2 CH3OH + 3 O2 -----> 2 H2O + 2 CO2 and the coefficient of oxygen is 3.What is the balanced equation of the combustion of methanol?Combustion is a reaction of a substance with oxygen with the release of heat and light.
In the combustion of methanol, carbon(iv) oxide and water are produced.
The balanced equation is:
2 CH3OH + 3 O2 -----> 2 H2O + 2 CO2
Based on the balanced equation, the coefficient of oxygen is 3.
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What is the magnitude of the electrostatic force between a singly charged sodium ion and an adjacent singly charged chlorine ion?