9.5 Flashcards
1
Q
what happens when ammonium nitrate dissolves in water
A
it takes in heat from the surroundings this process is endothermic
2
Q
how do sports injury packs work
A
they take in energy from the muscles when the solid inside the packs dissolve the water
3
Q
what is a solute
A
a solute is the substance that dissolves
4
Q
what does doing an investigation involve
A
- identifying the variables
- doing preliminary work
- choosing equipment
- assessing hazards and controlling risks
5
Q
why is it reccomended to repeat measurements three times
A
to reduce error and make results more reliable
6
Q
why uses secondary sources
A
using secondary data saves time and money, also secondary data is more reliable
