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Questions and Answers
During a chemical reaction, what property remains unchanged?
During a chemical reaction, what property remains unchanged?
- The number of atoms of each element (correct)
- The number of molecules
- The number of moles
- The total volume of reactants and products
Which of the following is a key characteristic of a combustion reaction that distinguishes it from other types of reactions?
Which of the following is a key characteristic of a combustion reaction that distinguishes it from other types of reactions?
- Decrease in the number of gaseous molecules
- Formation of a precipitate
- Reaction with oxygen (correct)
- Absorption of heat
Given the balanced equation $2 C_2H_6 + 7 O_2 \rightarrow 4 CO_2 + 6 H_2O$, what quantity of $O_2$ is needed for the complete combustion of 1 mole of $C_2H_6$?
Given the balanced equation $2 C_2H_6 + 7 O_2 \rightarrow 4 CO_2 + 6 H_2O$, what quantity of $O_2$ is needed for the complete combustion of 1 mole of $C_2H_6$?
- 2 moles
- 3.5 moles (correct)
- 7 moles
- 14 moles
In chemical equations, which symbol is used to denote that a substance is in the solid state?
In chemical equations, which symbol is used to denote that a substance is in the solid state?
If a reaction's actual yield is 10.0 g and its theoretical yield is 12.5 g, what is the percent yield of the reaction?
If a reaction's actual yield is 10.0 g and its theoretical yield is 12.5 g, what is the percent yield of the reaction?
For the reaction $A + 2B \rightarrow C$, if 2 moles of A are reacted with 5 moles of B, identify the limiting reactant.
For the reaction $A + 2B \rightarrow C$, if 2 moles of A are reacted with 5 moles of B, identify the limiting reactant.
What is the correct definition of molarity (M)?
What is the correct definition of molarity (M)?
What term describes a solution in which water acts as the solvent?
What term describes a solution in which water acts as the solvent?
If 50.0 mL of a 2.0 M solution is diluted to 200.0 mL, what is the new concentration of the solution?
If 50.0 mL of a 2.0 M solution is diluted to 200.0 mL, what is the new concentration of the solution?
What type of compound, when dissolved in water, enables the resulting solution to conduct electricity?
What type of compound, when dissolved in water, enables the resulting solution to conduct electricity?
Flashcards
Conservation in Chemical Reactions
Conservation in Chemical Reactions
The number of atoms of each element remains the same throughout a chemical reaction.
Combustion Reaction
Combustion Reaction
A chemical reaction that involves rapid reaction between a substance with an oxidant, usually oxygen, to produce heat and light.
Balanced Equation: 2 C2H6 + 7 O2
Balanced Equation: 2 C2H6 + 7 O2
Gives the information about the number of moles that is required to react completely with one mole of C2H6.
(s) in Chemical Equations
(s) in Chemical Equations
Indicates that the substance is in a solid state and is insoluble in water.
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Percent Yield
Percent Yield
A ratio that is expressed as a percentage, of the actual yield to the theoretical yield.
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Molarity (M)
Molarity (M)
The concentration of a solution expressed as the number of moles of solute per liter of solution.
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Aqueous Solution
Aqueous Solution
Any solution in which water (H2O) is the solvent.
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Spectator Ions
Spectator Ions
Ions that do not participate in a chemical reaction
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Strong Acid
Strong Acid
Acid that ionizes completely in aqueous solution
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Acid-Base Neutralization
Acid-Base Neutralization
Produce salt and water
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- The number of atoms of each element must be conserved in a chemical reaction.
- A characteristic of a combustion reaction is a reaction with oxygen.
- For the combustion of ethane (C2H6), 3.5 moles of O2 are required to react completely with 1 mole of C2H6, according to the balanced equation 2 C2H6 + 7 O2 → 4 CO2 + 6 H2O.
- A solid state in a chemical equation is represented by "(s)".
- If a reaction produces 10.0 g of product and the theoretical yield is 12.5 g, the percent yield is 80%.
- In the reaction A + 2B → C, if 2 moles of A are reacted with 5 moles of B, A is the limiting reactant.
- Molarity (M) is defined as moles of solute per liter of solution.
- A solution in which water is the solvent is called an aqueous solution.
- If you dilute 50.0 mL of a 2.0 M solution to 200.0 mL, the concentration of the new solution is 0.50 M.
- A strong electrolyte, when dissolved in water, will conduct electricity.
- According to the solubility rules, AgCl is generally insoluble in water.
- In a precipitation reaction, a solid precipitate is formed.
- Ions that do not participate in a chemical reaction and appear unchanged on both sides of the complete ionic equation are called spectator ions.
- HNO3 is a strong acid.
- In an acid-base neutralization reaction, the typical products are salt and water.
- Carbon dioxide (CO2) is typically produced when a carbonate reacts with an acid.
- In a redox reaction, the substance that loses electrons is said to be oxidized.
- The reactant that causes another substance to be reduced and is itself oxidized is called an oxidizing agent.
- The oxidation state of sulfur in H2SO4 is +6.
- Electromagnetic radiation is best described as perpendicular oscillating electric and magnetic fields.
- The distance from one crest of a wave to the next is called the wavelength.
- Violet has the shortest wavelength of visible light.
- The wavelength and frequency of light are inversely proportional.
- Einstein explained the photoelectric effect by proposing that light consists of quantized packets of energy called photons.
- The energy of a photon of light is directly proportional to its frequency.
- When an atom absorbs energy, an electron moves to a higher energy level.
- The pattern of particular wavelengths of light emitted by an atom is called its emission spectrum.
- Bohr's model proposed that electrons in atoms have quantized energy levels.
- The principal quantum number (n) characterizes the energy and size of an orbital.
- The angular momentum quantum number (l) determines the shape of an orbital.
- The magnetic quantum number ml specifies the orientation of an orbital in space.
- There are 3 p orbitals in a given energy level (n > 1).
- Orbitals with the same value of n and l are in the same sublevel.
- When an electron transitions from a higher energy level to a lower energy level, a photon of light is emitted.
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