Physical Science Unit 10 - Chemical Reactions (Practice)

The energy required to start a chemical reaction is _____________________.

• Activation Energy

• Products

• Reactants

• Enzymes

_______________ can speed up the rate of reactions and/or lower the amount of energy needed for the reaction to take place.

• Carbohydrates

• Fuel source

• Chemical

• Catalyst

Tags

NGSS.HS-PS1-5

Enzymes (biological catalysts) work by lowering the _______________ of chemical reactions.

• products

• solutes

• activation energy

• reactants

Chemical reactions that release energy are known as ________________________.

• Endothermic
• Exothermic
• Boring
• Reactions

Tags

NGSS.HS-PS1-4

Chemical reactions that absorb energy are known as ________________________.

• Endothermic
• Exothermic
• Boring
• Explosive

Tags

NGSS.HS-PS1-4

In a chemical equation, the substances on the right side of the arrow are called...

• reactants

• products

• catalysts

• inhibitors

The substances on the left side of the arrow are...

• products
• reactants
• inhibitors
• catalysts

Tags

NGSS.HS-PS1-7

A reaction that gives off heat to its surroundings is...

• exothermic
• endothermic
• endergonic
• none of these

Tags

NGSS.HS-PS1-4

How many atoms are there in total in:

H₂SO₄

• 6

• 5

• 7

• 4

Tags

NGSS.MS-PS1-1

What is decomposition?

• Putting substances together

• Breaking substances apart

• An element replacing another element in a compound

• The burning of a substance

Tags

NGSS.MS-PS1-5