Chemical Reactions Quiz

______ cannot be formed during a chemical reaction.

• Atoms

• Bonds

• Bubbles

• Precipitates

Tags

NGSS.MS-PS1-5

The atoms in the products of a chemical reaction

• were present in the reactants.

• did not exist before the reaction.

• were created using energy from the reaction.

Tags

NGSS.MS-PS1-5

In a chemical reaction, energy is released

• only when bonds are broken.

• only when bonds are formed.

• when bonds break and when bonds form.

Tags

NGSS.HS-PS1-4

A chemical reaction that has two products and two reactants could be a

• synthesis reaction.

• decomposition reaction.

• double-replacement reaction.

Which procedure would cause a chemical reaction to speed up?

• lowering the temperature of the reactants

• increasing the surface area of the reactants

• reducing the concentration of the reactants

In a chemical reaction, the mass of the products is always

• equal to the mass of the reactants.

• less than the mass of the reactants.

• greater than the mass of the reactants.

Tags

NGSS.MS-PS1-5

In a reaction that has one reactant and two products, the

• products have twice as much mass as the reactants.

• mass of the products is equal to the mass of the reactants.

• mass of the products is four times the mass of the reactants.

• mass of the products is not related to the mass of the reactants.

Tags

NGSS.MS-PS1-5

In a chemical reaction, what is activation energy required for?

• to form each of the bonds in the products

• to begin breaking the bonds of the reactants

• to provide enough energy for the entire reaction to occur

Tags

NGSS.HS-PS3-1

A new substance produced in a chemical reaction is called a(n) ______.

• catalyst

• reactant

• product

• inhibitor

Tags

NGSS.MS-PS1-2

A substance that slows down or stops a chemical reaction is called a(n) ______.

• catalyst

• inhibitor

• reactant

• product