Energy & Reactions

In an exothermic reaction, heat is ...

• transferred into the system

• transferred out of the system

• transferred equally between system and surroundings

Tags

NGSS.HS-PS1-4

Exothermic reactions...

• Absorb energy

• Release energy

• Release Odor

• Absorb Color

Tags

NGSS.HS-PS1-4

Have you ever eaten sherbet sweets candy? They fizz in your mouth and your tongue feels cold. Why do you think that is?

• It is an exothermic reaction
• It is an endothermic reaction
• It is made of ice
• It is dissolving your mouth

Tags

NGSS.HS-PS1-4

If an endothermic reaction is occurring in a beaker and you hold it in your hand, it would feel _______.

• Warm

• Cold

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

In an endothermic reaction the system is releasing energy.

• True

• False

Tags

NGSS.HS-PS1-4

The reactants in an exothermic reaction have a __________ energy than the products.

• Higher

• Lower

Tags

NGSS.HS-PS1-4

Reactants in an endothermic reaction have a __________ energy than the products.

• Higher

• Lower

Tags

NGSS.HS-PS1-4

Which of the following statesments explains the law of conservation of energy?

• Energy is needed to break chemical bonds
• An exothermic reactions releases energy
• Light energy is released by some exothermic reactions
• In a chemical reaction, energy is neither created nor destroyed, but can change form

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

Is the reaction endothermic or exothermic?

• Endothermic

• Exothermic

• Isothermic

• Nonthermic

Tags

NGSS.HS-PS1-4

Which letter represents the activation energy?

• B
• E
• C
• D

Tags

NGSS.HS-PS1-4