Reactants and Products Lesson Quiz

What is a chemical reaction?

• A process that leads to the transformation of mechanical substances

• A process that leads to the transformation of one set of chemical substances to another

• A process that leads to the transformation of physical substances

• A process that leads to the transformation of energy

Answer explanation

A chemical reaction is a process that transforms one set of chemical substances into another.

Give an example of a chemical reaction.

• Mixing salt and sugar

• Combustion of methane (CH4) in the presence of oxygen (O2) to produce carbon dioxide (CO2) and water (H2O)

• Burning wood to produce ash

• Boiling water to produce steam

Answer explanation

Combustion of methane (CH4) in the presence of oxygen (O2) produces carbon dioxide (CO2) and water (H2O). This is an example of a chemical reaction.

Explain the law of conservation of mass in the context of chemical reactions.

• Total mass of the reactants must be equal to the total mass of the products

• The mass of the reactants decreases during a chemical reaction

• The law of conservation of mass only applies to solid reactants and products

• The mass of the products is always greater than the mass of the reactants

What are reactants in a chemical reaction?

• Substances present at the end of a chemical reaction

• Substances that are only found in organic compounds

• Substances that are not involved in a chemical reaction

• Substances present at the beginning of a chemical reaction

List two examples of reactants in a chemical reaction.

• Carbon and nitrogen

• Sodium and chlorine

• Helium and argon

• Oxygen and hydrogen

Answer explanation

Reactants in a chemical reaction are the substances that undergo a chemical change. In this case, the correct reactants are oxygen and hydrogen.

Explain the role of reactants in a chemical reaction.

• Reactants have no role in a chemical reaction.

• Reactants are the substances that are present at the end of a chemical reaction and are used to produce the products.

• Reactants are only used to slow down a chemical reaction.

• Reactants are the substances that are present at the beginning of a chemical reaction and are used to produce the products.

Answer explanation

Reactants are the substances that are present at the beginning of a chemical reaction and are used to produce the products.

What are products in a chemical reaction?

• Ingredients used in the reaction

• The starting materials in a reaction

• Substances formed as a result of the reaction

• The catalysts that initiate the reaction

Answer explanation

Products in a chemical reaction are substances formed as a result of the reaction.

Describe the difference between reactants and products in a chemical reaction.

• Reactants are the substances present at the beginning of a chemical reaction, while products are the substances formed as a result of the reaction.

• Reactants and products are the same thing in a chemical reaction

• Reactants and products are interchangeable terms in a chemical reaction

• Reactants are formed at the end of a chemical reaction, while products are present at the beginning

Answer explanation

Reactants are the substances present at the beginning of a chemical reaction, while products are the substances formed as a result of the reaction.

What are the different types of chemical reactions?

• Solid, liquid, gas, plasma

• Addition, subtraction, multiplication, division

• Acidic, basic, neutral, alkaline

• Synthesis, decomposition, single displacement, double displacement, and combustion

Answer explanation

The different types of chemical reactions include synthesis, decomposition, single displacement, double displacement, and combustion. These reactions involve the rearrangement of atoms and the formation or breaking of chemical bonds.

Explain the characteristics of a synthesis reaction and provide an example.

• The characteristics of a synthesis reaction include the formation of a gaseous byproduct.

• The characteristics of a synthesis reaction include the combination of two or more substances to form a single product.

• The characteristics of a synthesis reaction include the separation of a single substance into two or more products.

• The characteristics of a synthesis reaction include the absence of any chemical change.

Answer explanation

A synthesis reaction involves combining two or more substances to form a single product. This is the correct choice.