Chemical Reactions Quiz

In this model the reactant molecules differ from the product molecules.

• True

• False

In this model the reactant atoms differ in number from the product atoms.

• True

• False

In this model the reactant atoms differ in type from the product atoms.

• True

• False

Leandra is learning about chemical reactions and she wants to examine the information that is included in a chemical equation. Which pieces of information does a chemical equation include? Choose the three that apply.

• the kinds of atoms that form during a reaction

• the kinds of molecules involved in the reaction

• the kinds of elements that make up a molecule

• whether the molecules are products or reactants

One day on her walk home from school, Leann noticed some rust on an old car. She remembered that chemical equations can summarize what happens in a chemical reaction. What is the name of the two parts found on the left side of the equation below?

4 Fe + 3O2 → 2Fe2O3

• products

• reactants

• scientific notation

• synthesis

Keesha performed a chemical reaction, and the products looked quite different from the reactants. She knew the amount of matter had not changed due to the law of conservation of mass. According to the law of conservation of mass, what happens in a chemical reaction?

• Matter is not created or destroyed and the same amount of mass remains.

• A new kind of matter is created and the amount of mass either increases or decreases.

• Matter is not created or destroyed and the amount of mass may change after the reaction.

• New matter is created and changes form so that the mass of the reactants and the products will almost be equal.

Which of the following reactions is balanced?

• 2CH₄ + O₂ -> CO₂ + H₂O
• CH₄ + 2O₂ -> CO₂ + H₂O
• CH₄ + 2O₂ -> CO₂ + 2H₂O
• None of the chemical equations are balanced.

Balance this equation.
_CH₄ + _O₂ --> _CO₂ + _H₂O

• 1,2,1,1
• 2,1,2,1
• 1,2,1,2
• 0,2,0,2

Identify this type of reaction,
Cl₂ + 2KI _-->  I₂ + 2KCl

• Synthesis
• Single Replacement
• Double Replacement
• Decomposition

Which chemical reaction breaks down into 2 substances?

• Double Replacement
• Single Replacement
• Synthesis
• Decomposition