Chemical Reactions and Energy

The substances present BEFORE a reaction occurs are called______.

• Products

• Exponents

• Factors

• Reactants

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is the substance present at the END of a reaction called?

• Product

• Exponent

• Integer

• Reactant

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In EXOTHERMIC reactions, energy is _____ from the reaction to the surroundings.

• Absorbed

• Released

• Eliminated

• Evaporated

Tags

NGSS.HS-PS1-4

In ENDOTHERMIC reactions, energy is _____ by the reaction system from the surroundings.

• Absorbed

• Released

• Eliminated

• Obliterated

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

What usually happens to TEMPERATURE in an ENDOthermic reaction?

• Increases

• Decreases

• Stays the same

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-5

Temperature usually _____ in EXOthermic reactions.

• Stays the same

• Increases

• Decreases

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-5

The starting temperature of a reaction was 21 degrees Celsius and the ending temperature was 44 degrees Celsius. What type of reaction occurred?

• EXOthermic

• ENDOthermic

Tags

NGSS.HS-PS1-4

Grinding a seltzer tablet into powder increases the rate of reaction due to increased

• concentration
• surface area
• temperature
• reactants

Tags

NGSS.HS-PS1-5

Which factors increase the rate of a reaction.

• increasing temperature
• increasing concentration
• increasing surface area
• all of these

Tags

NGSS.HS-PS1-5

Why does a higher concentration increase the rate of reaction?

• it increases the amount of reactants
• it lowers the activation energy
• it increases the energy of particle collisions
• it increases the frequency of particle collisions because there are more collision sites

Tags

NGSS.HS-PS1-5