Exothermic and Endothermic Reactions

During a particular chemical reaction it takes 100 Kj of energy to break all the bonds and 150 Kj of energy is released when the new bonds form. Which is true about the overall reaction?

• It is endothermic and absorbs energy.

• It is exothermic and releases 150 Kj

• It is exothermic and releases 50 Kj

• It is endothermic and releases energy.

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

 In an exothermic reaction, heat is ...

• absorbed

• released

Tags

NGSS.HS-PS1-4

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

• stay the same

• increase

• decrease

Tags

NGSS.HS-PS1-4

What type of reaction occurs in hand warmers?

• exothermic

• endothermic

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

_____ reactions usually feel hot!!

• endothermic

• exothermic

Tags

NGSS.HS-PS1-4

When iron nails get rusty, heat is released.  What process is this?

• Exothermic

• Endothermic

Tags

NGSS.HS-PS1-4

Is this diagram showing an endothermic or exothermic reaction?

• Endothermic

• Exothermic

Tags

NGSS.HS-PS1-4

An endothermic reaction occurs in a beaker. If we touched the beaker, it would most likely feel _______. 

• warm

• cold

Tags

NGSS.HS-PS3-4

Baking bread and cooking an egg are examples of....?

• Endothermic Process

• Exothermic Process

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

When barium hydroxide and ammonium chloride react, the temperature of the mixture decreases. What kind of reaction is this?

• Endothermic

• Exothermic

Tags

NGSS.HS-PS1-4