chemical reactions Flashcards
1
Q
what is a chemical reaction
A
when the atoms in a existing substances are rearranged to make new substances
2
Q
indicators of chemical change
A
colour, physical properties, sound, light and temperature
3
Q
what are reactants
A
substances that undergo changes in chemical reactions
4
Q
what are products
A
substances made in chemical reactions
5
Q
what conditions are required for unspotaneuse chemical reactions
A
heat energy, light energy, high pressure, catalyst, longer amount of time
