If energy is written on the reactants side of an equation, it likely means that ____.

activation energy is required to start the reaction

we need to mix energy with the other elements

the law of conservation of mass

Balancing Equations And Chemical Reactions: Quiz

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Questions: 10 | Attempts: 865 | Updated: Mar 21, 2023

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Balancing Equations And Chemical Reactions: Quiz - Quiz

When it comes to chemistry, students are expected to understand how to balance equations and chemical reactions. When mixed, different elements form a solution, and the changes can either be physical or chemical. Test your understanding of chemical reactions and solutions by taking the quiz below and check your notes for solutions after.

Questions and Answers

1.

A reaction that causes a chemical change is called _____.
- A.
  
  Physical change
- B.
  
  Chemical reaction
- C.
  
  A flare
- D.
  
  Light
Correct Answer
B. Chemical reaction

Explanation
A reaction that causes a chemical change is called a chemical reaction. This is because a chemical reaction involves the breaking and forming of chemical bonds, resulting in the formation of new substances with different properties from the original substances. In contrast, a physical change refers to a change in the physical state or appearance of a substance, without any alteration in its chemical composition. A flare and light are not specific terms for reactions causing chemical changes, but rather refer to the emission of light or a specific device used to produce light.

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2
0
2.

Reactants and products are both parts of _____.
- A.
  
  Chemical equations
- B.
  
  Math
- C.
  
  Nuclear fission
- D.
  
  Conservation of mass
Correct Answer
A. Chemical equations

Explanation
Reactants and products are both parts of chemical equations. In a chemical equation, reactants are the substances that undergo a chemical change, while products are the substances that are formed as a result of the chemical reaction. Chemical equations are used to represent the reactants and products involved in a chemical reaction, and they provide a balanced representation of the conservation of mass.

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1
0
3.

The two types of numbers in chemical equations are called _____.
- A.
  
  Exponents and coefficients
- B.
  
  Addition and subtraction
- C.
  
  Superscripts and subscripts
- D.
  
  Coefficients and subscripts
Correct Answer
D. Coefficients and subscripts

Explanation
In chemical equations, coefficients represent the number of molecules or atoms involved in a reaction, while subscripts indicate the number of atoms of a particular element in a molecule. Therefore, the correct answer is "coefficients and subscripts".

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4.

Coefficients tell us how many _____are in the equation.
- A.
  
  Chemicals
- B.
  
  Molecules
- C.
  
  Atoms
- D.
  
  Reactions
Correct Answer
B. Molecules

Explanation
Coefficients tell us how many molecules are in the equation. In a chemical equation, coefficients are used to balance the number of molecules on each side of the equation. They represent the ratio of molecules participating in the reaction. By adjusting the coefficients, we can ensure that the number of molecules of each element is the same on both sides of the equation, thus maintaining the law of conservation of mass. Therefore, coefficients provide crucial information about the quantity of molecules involved in a chemical equation.

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5.

Subscripts tell us how many _____ are in the equation.
- A.
  
  Chemicals
- B.
  
  Molecules
- C.
  
  Atoms
- D.
  
  Reactions
Correct Answer
C. Atoms

Explanation
Subscripts in a chemical equation indicate the number of atoms present in the equation. They are used to balance the equation and show the stoichiometry of the reaction. By using subscripts, we can determine the exact number of each type of atom involved in a chemical reaction.

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6.

Endothermic reactions ____.
- A.
  
  Absorb heat energy
- B.
  
  Release heat energy
- C.
  
  Take place only in humans
- D.
  
  Cannot be written
Correct Answer
A. Absorb heat energy

Explanation
Endothermic reactions refer to chemical reactions that absorb heat energy from their surroundings. These reactions require an input of energy to proceed and result in a decrease in temperature of the surroundings. This is because the reactants in an endothermic reaction have lower energy than the products, and the additional energy is absorbed from the surroundings. Therefore, the correct answer is "absorb heat energy."

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7.

Exothermic reactions _____.
- A.
  
  Absorb heat energy
- B.
  
  Release heat energy
- C.
  
  Take place only in humans
- D.
  
  Cannot be written
Correct Answer
B. Release heat energy

Explanation
Exothermic reactions release heat energy. This means that during these reactions, energy is being released in the form of heat. This is in contrast to endothermic reactions, where heat energy is absorbed. Exothermic reactions can occur in various substances and are not limited to humans.

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8.

If energy is written on the reactants side of an equation, it likely means that ____.
- A.
  
  We need to mix energy with the other elements
- B.
  
  The law of conservation of mass
- C.
  
  Activation energy is required to start the reaction
- D.
  
  You made a mistake
Correct Answer
C. Activation energy is required to start the reaction

Explanation
If energy is written on the reactants side of an equation, it likely means that activation energy is required to start the reaction. Activation energy is the minimum amount of energy needed for a chemical reaction to occur. By including energy as a reactant, it indicates that the reaction requires an input of energy to initiate the reaction and overcome the energy barrier. This energy can come in the form of heat, light, or any other form of energy.

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9.

The energy released in reactions can be released in all of the following ways except _____.
- A.
  
  Sound
- B.
  
  In food
- C.
  
  Heat
- D.
  
  Light
Correct Answer
B. In food

Explanation
The energy released in reactions can be released in the form of sound, heat, and light. However, it is not released in the form of food. Food is a source of energy, but it is not a way in which energy is released during reactions.

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10.

All of the following can affect the rate of a chemical reaction except_____.
- A.
  
  Color
- B.
  
  Concentration
- C.
  
  Temperature
- D.
  
  Surgace area
Correct Answer
A. Color

Explanation
The color of a substance does not have a direct impact on the rate of a chemical reaction. The rate of a chemical reaction is typically influenced by factors such as concentration, temperature, and surface area. Concentration refers to the amount of reactants present, temperature affects the kinetic energy and collision frequency of particles, and surface area affects the contact between reactant molecules. However, color is not directly related to these factors and therefore does not affect the rate of a chemical reaction.

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Current Version
Mar 21, 2023

Quiz Edited by
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Jan 18, 2012

Quiz Created by
MrTimm8

Balancing Equations And Chemical Reactions: Quiz

A reaction that causes a chemical change is called _____.

Reactants and products are both parts of _____.

The two types of numbers in chemical equations are called _____.

Coefficients tell us how many _____are in the equation.

Subscripts tell us how many _____ are in the equation.

Endothermic reactions ____.

Exothermic reactions _____.

If energy is written on the reactants side of an equation, it likely means that ____.

The energy released in reactions can be released in all of the following ways except _____.

All of the following can affect the rate of a chemical reaction except_____.