C7.2 Using energy transfers from reaction Flashcards
1
Q
How do body warmers work?
A
➢ Use exothermic reactions to warm you up
➢ Some can only be used once
➢ Some can be used lots of times
2
Q
How do self heating cans work?
A
➢ You press a button in the base of the can
➢ This breaks a seal and lets the water and calcium oxide mix
➢ Then the exothermic reaction begins
➢ Which transfer energy to the substance that needs heating
3
Q
How do chemical cold packs work?
A
➢ Ammonium nitrate in it dissolves - it absorbs energy from it surroundings making them colder
➢ Endothermic reaction
4
Q
How can you chill cans of drinks?
A
➢ Using endothermic reactions
