Chemical Reactions Test

What happens in a chemical reaction?

• Atoms are destroyed.

• Atoms are created.

• Atoms are heated and cooled.

• Atoms are rearranged.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of these is not a sign of a chemical reaction?

• A gas is given off.

• The material dissolves.

• Heat is released.

• A color change occurs.

Tags

NGSS.MS-PS1-2

In a balanced chemical equation, the mass of the reactants is equal to the

• atoms in a molecule.

• atomic mass of the elements.

• volume of the reactants.

• mass of the products.

Tags

NGSS.MS-PS1-5

The substance that is formed in a chemical reaction is called the

• polymer.

• reactant.

• radical.

• product.

A reaction in which the products contain more chemical energy than the reactants is

• exothermic.

• electrical.

• endothermic.

• exergonic.

Tags

NGSS.MS-PS1-4

A chemical equation is balanced by changing or adding

• chemical symbols.

• subscripts.

• coefficients.

• reactants.

A balanced chemical equation shows the proportions of reactants and products necessary for

• the reaction to occur.

• matter to be conserved.

• energy use to be minimized.

• electrolysis to occur.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A balanced chemical equation indicates both the number of particles of reactants and products and the number/ratio of

• orbits.

• electrons.

• nuclei.

• moles.

Tags

NGSS.MS-PS1-5

A substance that undergoes a change in a chemical reaction is

• a product.

• a chemical.

• a reactant.

• an enzyme.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is/are the product(s) in the following reaction? 2NH₃ → N₂ + 3H₂

• NH₃

• N₂

• H₂

• both N₂ and H₂

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5