science test 23/04/24 Flashcards
1
Q
what is thermal decomposition
A
a chemical reaction that happens when a compound breaks down when heated.
2
Q
what is the conservation of mass
A
in a chemical reaction, atoms cannot be created or destroyed
3
Q
what is an endothermic reaction
A
a chemical reaction that absorbs heat from its surroundings
4
Q
what is an exothermic reaction
A
a chemical reaction that releases heat to its surroundings
5
Q
example of an endothermic reaction
A
photosynthesis, thermal decomposition, melting ice
6
Q
example of an exothermic reaction
A
combustion, making ice
7
Q
how do you work out the resultant force
A
if more than one force is acting on an object you add the forces together to work out the resultant force
8
Q
formula for pressure
A
force % area=pressure
