Answer: A
Explanation:
QUESTION 5
In their compounds, metals:
are assigned positive oxidation numbers
are assigned negative oxidation numbers
are assigned oxidation numbers of zero
can be assigned any oxidation number that balances the equation
QUESTION 6
In the reaction, Zn (s) + Fe+2 (aq) Imported Asset Zn+2 (aq) + Fe (s), the oxidizing agent is:
the Zn
the Fe
the Zn+2
the Fe+2
In compounds, metals have positive oxidation numbers; for instance, iron has a +2 oxidation number in FeO. In the reaction Zn + Fe2+ → Zn2+ + Fe, Fe2+ is the oxidizing agent as it gains electrons and is reduced.
In their compounds, metals are generally assigned positive oxidation numbers because they tend to lose electrons and form cations. For example, in FeO, iron has an oxidation number of +2 (Fe2+), correctly balancing the -2 charge from oxygen to result in a neutral compound.
Regarding the reaction Zn (s) + Fe2+ (aq) → Zn2+ (aq) + Fe (s), the oxidizing agent is the species that is reduced by gaining electrons. In this case, Fe2+ is the oxidizing agent because it gains electrons from Zn to form Fe (s). The Zn is oxidized to Zn2+, making it the reducing agent.
Nuclear fusion of hydrogen into helium occurs in the
Nuclear fusion of hydrogen into helium occurs in the core of stars, specifically in their stellar cores.
This process is known as stellar nucleosynthesis and is the primary source of energy production in stars. The intense heat and pressure in the core of a star allow hydrogen nuclei (protons) to overcome their mutual electrostatic repulsion and undergo fusion reactions. It results in the formation of helium nuclei.
The most common fusion reaction in stars is the proton-proton chain, which involves a series of steps leading to the conversion of four hydrogen nuclei into one helium nucleus.
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Predict how the addition of a catalyst would affect the rate of the reaction below, and explain your prediction. h2 (g) + i2 (g) 2hi
Explanation:
A catalyst helps in increasing the rate of a chemical reaction without itself getting consumed in the reaction.
Basically, a catalyst decreases the activation energy so that reactant molecules can easily participate in the reaction.
For example, when a catalyst is added to [tex]H_{2}(g) + I_{2}(g) \rightarrow 2HI[/tex] then there will be a decrease in activation energy and both reactants (hydrogen and iodine) can easily participate in the chemical reaction.
As a result, formation of product (HI) becomes faster.
Thus, we can conclude that a catalyst helps in increasing the rate of a reaction.
What elements make up molecules of sugar?
What is the only subatomic particle that is directly involved in the chemical reactions?
A chemist dissolves 192.mg of pure sodium hydroxide in enough water to make up 150.ml of solution. calculate the ph of the solution.
What volume of 0.0250 m calcium hydroxide is required to neutralize 33.50 ml of 0.0200 m nitric acid?
An elixir of ferrous sulfate contains 220 mg of ferrous sulfate in each 5 ml. if each milligram of ferrous sulfate contains the equivalent of 0.2 mg of elemental iron, how many milligrams of elemental iron would be represented in each 5 ml of the elixir?
Each 5 ml of the ferrous sulfate elixir contains 44 milligrams of elemental iron.
Explanation:The question is asking for the amount of elemental iron in 5 ml of ferrous sulfate elixir. Given that each milligram of ferrous sulfate contains 0.2 mg of elemental iron and there's 220 mg of ferrous sulfate present in every 5 ml, a simple multiplication would give the quantity of elemental iron in each 5 ml of the elixir.
Formula: Ferrous Sulfate (mg) x Elemental Iron/Ferrous Sulfate = Elemental Iron (mg)
Using the given values, it goes as follows: 220 mg x 0.2 = 44 mg. Consequently, each 5 ml of the elixir contains 44 milligrams of elemental iron.
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Water beads up on waxy surfaces because of a ___________ degree of adhesion with the surface?
high
low
the correct answer is low
How is the rate of evaporation of a liquid affected by (a) temperature, (b) the surface area of liquid exposed to air, (c) intermolecular forces??
Final answer:
The rate of evaporation is higher with increased temperature, greater surface area, and weaker intermolecular forces; temperature rise decreases the surface tension of water.
Explanation:
The rate of evaporation of a liquid is influenced by several factors. Let us look at these factors one by one:
Temperature: As temperature increases, the average kinetic energy of the molecules also increases. This means more molecules have sufficient energy to overcome the intermolecular forces and escape into the gas phase, thus increasing the rate of evaporation.
Surface Area: The greater the surface area exposed to air, the more molecules are available to evaporate at any given time, leading to a higher rate of evaporation.
Intermolecular Forces: Stronger intermolecular forces make it more difficult for molecules to escape into the gas phase, resulting in lower rates of evaporation. Conversely, weaker intermolecular forces enhance the rate of evaporation.
If we specifically look at how temperature affects surface tension, we note that an increase in temperature will generally result in a decrease in the surface tension of water. This happens because as the temperature rises, the molecules have more kinetic energy, which disrupts the cohesive intermolecular forces between water molecules, thus decreasing surface tension.
Which best describes how the current scientific model of the atom was developed the model was the result of hundreds of years of experiments recent experiments in a valid in most of the book of last 200 years most of the discoveries from the early nineteen-hundreds was shown to be incorrect new experiments for ignored or they did not agree with the accepted Theory
Answer:
The model was the result of hundreds of years of experiments. however we have had modifications.
Explanation:
What is/are the product(s) of a neutralization reaction of a carboxylic acid?
The products of neutralization reaction of carboxylic acid are salt of weak acid and water.
What are neutralization reactions?Neutralization reactions are chemical reactions wherein acid and a base react to form salt and water as the products.In these reactions, the H[tex]^+[/tex] and OH[tex]^-[/tex] ions combine to give water.
Neutralization reactions wherein strong acid and strong base are involved the pH of solutions is 7.The neutralization reaction of strong acid and weak base result in solution with pH less than 7 and pH is greater 7 when neutralization takes place between strong base and weak acid.
Salts formed from neutralized solution has equal weight of acid and base.Most commonly used application of neutralization reactions is titrations. Neutralization reactions are a type of double displacement reactions.These reactions are important because it affects behavior of solution and it's interaction with other substances.
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What is the molarity of a sodium hydroxide solution if 35.4 ml of this solution is neutralized by 24.2 ml of 1.19 m sulfuric acid solution?
The molarity of the sodium hydroxide solution is approximately 0.818 M.
Explanation:To determine the molarity of the sodium hydroxide solution, we can use the equation for the reaction between sodium hydroxide and sulfuric acid: 2NaOH + H₂SO4 → Na₂SO4 + 2H₂O. From the balanced equation, we can see that the ratio of NaOH to H₂SO4 is 2:1. Thus, if 24.2 mL of 1.19 M sulfuric acid solution neutralizes 35.4 mL of the sodium hydroxide solution, we can set up the following equation:
Molarity of NaOH × Volume of NaOH = Molarity of H₂SO4 × Volume of H₂SO4
Molarity of NaOH × 35.4 mL = 1.19 M × 24.2 mL
Rearranging the equation, we get:
Molarity of NaOH = (1.19 M × 24.2 mL) / 35.4 mL
Calculating the molarity of NaOH, we find that it is approximately 0.818 M.
Calculate the pressure in atmospheres exerted by 10.0moles of hydrogen gas at 293 kelvins if it is stored in a 7.50 liter container. Your value should be a decimal number written to three significant figures. Given: R= 0.08205 liter x atmosphere/mole x kelvin
Answer:
The correct answer is 32.1 atm. If you rearrange the ideal gas law equation to find pressure (P) and substitute the known values for the rest of the variables (n, T, and V), we get pressure equal to 32.1 atm.
Explanation:
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A certain weak acid, ha, has a ka value of 8.4×10−7. calculate the percent ionization of ha in a 0.10 m solution
To
determine the percent ionization of the acid given, we make use of the acid
equilibrium constant (Ka) given. It is the ratio of the equilibrium
concentrations of the dissociated ions and the acid. The dissociation reaction
of the HF acid would be as follows:
HA = H+ + A-
The acid equilibrum constant would be expressed as follows:
Ka = [H+][A-] / [HA] = 8.4 x 10^-7
To determine the equilibrium concentrations we use the ICE table,
HF
H+ A-
I 0.10 0
0
C -x +x
+x
---------------------------------------------
E 0.10-x x
x
8.4 x 10^-7= [H+][A-] / [HA]
8.4 x 10^-7 = [x][x] / [0.10-x]
Solving for x,
x = 0.0002894 = [H+] = [A-]
percent ionization = 0.0002894 / 0.10 x 100 = 0.289%
Which of the following changes requires an oxidizing agent?
O2 yields 2O2-
SO3 yields SO42-
2F- yields F2
MnO2 yields Mn2+
Answer : The correct option is, [tex]2F^-\rightarrow F_2+2e^-[/tex]
Explanation :
Oxidation reaction : It is defined as the reaction in which a substance looses its electrons. In the oxidation reaction, the oxidation state of an element increases. Or we can say that in oxidation, the loss of electrons takes place.
Oxidizing agent : It is defined as the substance which has ability to oxidize the other substances by gaining electrons.
Reduction reaction : It is defined as the reaction in which a substance gains electrons. In the reduction reaction, the oxidation state of an element decreases. Or we can say that in reduction, the gain of electrons takes place.
Reducing agent : It is defined as the substance which has ability to reduce the other substances by losing electrons.
From the given options, we conclude that
(1) [tex]O_2+4e^-\rightarrow 2O^{2-}[/tex]
(2) [tex]SO_3+H_2O\rightarrow SO_4^{2-}+2H^+[/tex]
(3) [tex]MnO_2+4H^++2e^-\rightarrow Mn^{2+}+2H_2O[/tex]
The reaction 1, 2 and 3 shows the reduction reaction. So, it requires a reducing agent.
(4) [tex]2F^-\rightarrow F_2+2e^-[/tex]
The reaction 4 shows the oxidation reaction. Therefore, it requires an oxidizing agent.
Therefore, the correct option is, [tex]2F^-\rightarrow F_2+2e^-[/tex]
Describe one chemical property of Group 1 metals that results from the atoms of each metal having only one valence electron.
A chemical property of Group 1 metals that results from the atoms of each metal having only one valence electron is electronegativity.
Group 1 elements are also known as alkali metals. They include sodium, lithium, potassium, cesium, francium, and rubidium. They can be found in seawater.
A chemical property of Group 1 metals that results from the atoms of each metal having only one valence electron is electronegativity. This means the tendency for the atoms to be able to attract electrons.
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How many carbon atoms are in the fragment that is fed into the citric acid cycle to bind with oxaloacetate and what is this molecule called?
What would be the formula of the precipitate that forms when pb(no3)2 (aq) and k2so4 (aq) are mixed?
How is the volatility of a substance related to the intermolecular forces present within the substance? how is the volatility of a substance related to the intermolecular forces present within the substance? the weaker the intermolecular forces, the more likely it is that molecules are to evaporate at a given temperature, making the liquid more volatile. the volatility of a substance does not depend on the intermolecular forces present within the substance. the stronger the intermolecular forces, the more likely it is that molecules are to evaporate at a given temperature, making the liquid more volatile?
The less volatile a chemical is, the stronger the intermolecular interactions must be overcome before they can be overcome using energy or temperature.
What is intermolecular interaction ?Intermolecular forces, such as the electromagnetic forces of attraction or repulsion that act between atoms and other kinds of nearby particles, such as atoms or ions, mediate interactions between molecules.
Intermolecular forces come in five flavors: ion-induced dipole forces, dipole-induced dipole forces, induced dipole forces, and dipole-dipole forces. Ions and polar (dipole) molecules are held together by ion-dipole forces.
Ionic bonds, hydrogen bonds, Van der Waals dipole-dipole interactions, and Van der Waals dispersion forces are the four main intermolecular force.
Thus, The weaker the intermolecular interactions, the less energy is needed to overcome them and convert the substance from liquid to vapor or gas.
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What is the concentration of hydroxide ions in a solution with a pH of 5.24?
5.75 × 10-6
1.74 × 10-9
1.55 × 10-7
4.54 × 10-4
Answer:
The concentration of hydroxide ions in a solution with a pH of 5.24 is [tex]1.74\times 10^{-9} M[/tex].
Explanation:
The pH of the solution is defined as negative logarithm of [tex]H^+[/tex] ions in solution.
[tex]pH=-\log[H^+][/tex]
The pH of the solution = 5.24
Sum of pH and pOH is equal to 14.
[tex]pH+pOH=14[/tex]
[tex]pOH=14-pH=14-5.24=8.76[/tex]
[tex]pOH=-\log[OH^-][/tex]
[tex]8,76=\log[OH^-][/tex]
[tex][OH^-]=1.7378\times 10^{-9}\approx=1.74\times 10^{-9} M[/tex]
The concentration of hydroxide ions in a solution with a pH of 5.24 is [tex]1.74\times 10^{-9} M[/tex].
Constance is making a vegetable soup that contains carrots, beans, water, salt, pepper, bits of ham, and onions. the soup has to cook for 4 hours. while the soup is cooking, what will happen to some of the minerals that are in its ingredients?
Cooking can alter the structure of proteins and destroy certain vitamins in the soup ingredients, while salt acts as a preservative to prevent bacterial growth.
Explanation:When the soup is cooking, some of the minerals in its ingredients may undergo changes. For example, cooking can alter the structure of proteins in the ham and vegetables, making them easier to digest. However, cooking can also destroy certain vitamins, such as vitamins B and C in vegetables. Additionally, salt, which is a mineral, is used as a preservative in the soup, preventing the growth of bacteria by dehydrating them through osmotic pressure.
The solubility of silver chloride can be increased by dissolving it in a solution containing ammonia. agcl (s) ag+ (aq) + cl- (aq) k1 = 1.6 x 10-10 ag+ (aq) + 2nh3 (aq) ag(nh3)2+ (aq) k2 = 1.5 x 107 what is the value of the equilibrium constant for the overall reaction? agcl (s) + 2nh3 (aq) ag(nh3)2+ (aq) + cl- (aq) knet = ?
Final answer:
To calculate the net equilibrium constant for the dissolution of silver chloride in ammonia, the individual constants for the dissolution of AgCl and the formation of [tex][Ag(NH_3)_2]^+[/tex] are multiplied, yielding Knet = 2.4 x 10^-3.
Explanation:
The solubility of silver chloride (AgCl) in ammonia solution can be analyzed using the concept of equilibrium constants. The equilibrium constant (K) for the dissolution of AgCl in water is given as 1.6 x 10-10, and the formation constant (K2) of the complex ion [tex][Ag(NH_3)_2]^+[/tex] is 1.5 x 107. To find the net equilibrium constant (Knet) for the overall reaction where AgCl dissolves in the presence of NH3 to form the complex ion and release Cl-, we can multiply the individual constants: K1 * K2. Thus, Knet = (1.6 x 10-10)(1.5 x 107) = 2.4 x 10-3.
Determine the [oh] concentration in a 0.169 m ca(oh)2 solution. 0.338 m 0.169 m 5.92 x 10-14 m 2.96 x 10-14 m 0.298 m
The [OH-] concentration in the 0.169 M Ca(OH)2 solution is 0.0088 M. The pOH of the solution is 2.055, and the pH is 11.945.
Explanation:We begin by determining the concentration of hydroxide ions, [OH-], in the Ca(OH)2 solution. Since Ca(OH)2 is a strong base, there are two OH ions for every formula unit dissolved, so the concentration of OH- is 2 times the concentration of Ca(OH)2. Therefore, [OH-] = 2 × 0.0044 M = 0.0088 M.
The concentration of hydroxide ions can be used to calculate the pOH of the solution. The pOH is obtained by taking the negative logarithm of [OH-]. In this case, pOH = -log(0.0088) = 2.055.
To calculate the pH of the solution, subtract the pOH from 14. pH = 14 - 2.055 = 11.945.
What is the molar mass of (NH4)2O? Explain how you calculated this value.
The molar mass of (NH₄)₂O (ammonium oxide) is 52.10 g/mol.
To calculate the molar mass of (NH₄)₂O (ammonium oxide), we need to determine the total sum of the atomic masses of all the atoms in the chemical formula.
The atomic masses are as follows:
N (Nitrogen) = 14.01 g/mol
H (Hydrogen) = 1.01 g/mol
O (Oxygen) = 16.00 g/mol
Now, let's calculate the molar mass of (NH₄)₂O:
Molar mass of (NH₄)₂O = (2 x N) + (8 x H) + (1 x O)
Molar mass of (NH₄)₂O = (2 x 14.01 g/mol) + (8 x 1.01 g/mol) + (1 x 16.00 g/mol)
Molar mass of (NH₄)₂O = 28.02 g/mol + 8.08 g/mol + 16.00 g/mol
Molar mass of (NH₄)₂O = 52.10 g/mol
So, the molar mass of (NH₄)₂O (ammonium oxide) is approximately 52.10 g/mol.
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The national drug code number (NDC) of the drug is included in this section of a drug monograph
The oxidation numbers of nitrogen in nh3, hno3, and no2 are, respectively:
Answer:
The oxidation number are
NH₃: -3
HNO₃ : +5
NO₂ : +4
Explanation:
The oxidation number is calculated considering that
a) oxidation number of hydrogen is +1 in all compounds except hydrides
b) oxidation number of oxygen is -2 in all compound except peroxides, superoxides and compound of fluorine.
a) NH₃ : let the oxidation number of nitrogen is "x"
x + 3 (+1) = 0
Therefore x = -3
b) HNO₃
Let the oxidation number of nitrogen is "x"
+1 + x +3(-2) = 0
x = -5.
c) NO₂
Let oxidation number of nitrogen ix "x"
x + 2(-2)= 0
x = +4
Baking soda (nahco3) decomposes when it is heated according to the equation below. how many kilojoules of heat are required to decompose 1.96 mol nahco3(s)
To decompose 1.96 mol of NaHCO₃ (s), 199.2 kJ of heat is required.
Explanation:When baking soda (NaHCO₃) decomposes upon heating, it undergoes a chemical reaction, producing sodium carbonate (Na₂CO₃), water vapor (H₂O), and carbon dioxide gas (CO₂). The balanced equation for this reaction is:
NaHCO₃ (s) [tex]\rightarrow \text[/tex] {Na₂CO₃ (s) + H₂O (g) + CO₂ (g)
To determine the heat required to decompose a given amount of (NaHCO₃), we can use the stoichiometry of the reaction. The coefficient in front of (NaHCO₃) in the balanced equation is 2, indicating that 2 moles of (NaHCO₃) produce the products mentioned in the reaction.
Given that we have 1.96 mol of (NaHCO₃), we can set up a proportion to find the heat required:
[tex]\[\frac{\text{moles of } NaHCO₃}{\text{coefficient of } NaHCO₃} = \frac{\text{heat required}}{\text{coefficient of } Na₂CO₃}\][/tex]
[tex]\[ \frac{1.96}{2} = \frac{\text{heat required}}{1} \][/tex]
Solving for the heat required:
[tex]\[ \text{heat required} = 1.96 \times \frac{1}{2} \times \text{heat of the reaction} \][/tex]
The heat of the reaction can be obtained from thermochemical tables or databases. For the given reaction, it is typically around 199.2 kJ. Therefore, the heat required to decompose 1.96 mol of (NaHCO₃) is [tex]\(1.96 \times \frac{1}{2} \times 199.2 = 99.6\) kJ.[/tex]
In conclusion, 99.6 kJ of heat is needed to decompose 1.96 mol of (NaHCO₃) based on the provided chemical reaction.
Complete Question:
Baking soda (NaHCO₃) decomposes when it is heated according to the equation below:
[tex]\[2 \text{NaHCO}_3 (s) \rightarrow \text{Na}_2\text{CO}_3 (s) + \text{H}_2\text{O} (g) + \text{CO}_2 (g)\][/tex]
How many kilojoules of heat are required to decompose 1.96 mol of NaHCO₃ (s)?
What is the H+ if the pH of a solution is 1.65?
Answer:
[H⁺] = 2.2 × 10⁻²
Explanation:
pH = -log [H⁺]
10∧-pH = [H⁺]
[H⁺] = 10⁻¹°⁶⁵
[H⁺] = 0.0224
[H⁺] = 2.2 × 10⁻²
So the concentration of hydrogen in solution of 1.65 pH is 2.2 × 10⁻².
what is the percent composition in chloric acid (HClO3)?