Reaction Energy from Bond Energies

If a chemical reaction is EXOTHERMIC, the temperature would....

• increase

• stay the same

• decrease

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-5

In an endothermic reaction the system is releasing energy.

• true

• false

Is the combustion of gasoline endothermic or exothermic?

• exothermic

• endothermic

Tags

NGSS.HS-PS1-4

During an endothermic reaction in a beaker if we are part of the surroundings and touched the beaker, it would feel _______.

• exothermic

• warm

• cold

• endothermic

Tags

NGSS.HS-PS3-4

A student mixed two chemicals to allow them to react. The temperature before the reaction was 25 ° C. The temperature after the reaction was 18° C. What is the temperature change?

• endothermic

• it increases by 7

• it decreases by 7

• exothermic

Tags

NGSS.HS-PS1-4

Accuracy : 38%

A student mixed two chemicals to allow them to react. The temperature before the reaction was 25 ° C. The temperature after the reaction was 18° C. Which of the following is true?

• the reaction is a neutralisation reaction

• the reaction is exothermic

• the reaction is endothermic

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

If the energy required to break the bonds is greater than the energy given out by making new bonds the reaction is....

• endothermic

• exothermic

• neutralisation

• combustion

Tags

NGSS.HS-PS1-4

If the energy required to break the bonds is less than the energy given out by making new bonds the reaction is

• endothermic

• exothermic

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?

• An endothermic reaction is happening

• combustion is happening

• an exothermic reaction is happening

Tags

NGSS.HS-PS1-4

Which letter corresponds to the energy of the products?

• A

• B

• C

• D

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1