Using Energy Transfers From Reactions

Question 1

Chemical Hand and Body Warmers can be _________. These Products Use _______________ Reactions to Warm You Up.

Answer 1

Useful…Exothermic…

Question 2

A Supersaturated Solution is Prepared by ____________ as Much of the Salt as Possible in Hot Water.

Answer 2

Dissolving.

Question 3

The Crystals Spread Throughout the Solution Transferring __________ to the Surroundings in an Exothermic Change. They Work for About ____ Minutes.

Answer 3

Energy…30…

Question 4

Exothermic Reactions are Used in Self-Heating ______.

Answer 4

Cans.

Question 5

What is the Reaction Used to Transfer Energy to Food or Drink?

Answer 5

Calcium Oxide + Water —> Calcium Hydroxide.

Question 6

Endothermic Processes can be Used to _______ Things Down.

Answer 6

Cool.

Question 7

Endothermic Reactions _________ Energy From Their Surroundings, Making Them Colder.

Answer 7

Absorb.

Question 8

Instant Cold Packs Work For About ___ Minutes. They can be Used Once, but are _______ where there is No Ice Available to Treat a Knock or Strain.

Answer 8

20…Ideal…