Chemical Reactions Flashcards
1
Q
what are the evidence of change?
A
colour change
temperature change; endothermic (the product is cold) and exothemeric (the product is hot)
gas being formed; bubbling or fizzing
precipitation; when two liquids are combined together make a solid.
energy being released; heat, light or sound
2
Q
what is a catalyst?
A
is the substance which speeds up the reaction and decreases the energy of the two other substances so the reaction can take place.
3
Q
what is an example of a catalyst?
A
enzymes in washing powder or a catalyst convertor uses platinum to increase the amount of carbon dioxide produced in a car exhaust.
