Chemical reactions Flashcards
1
Q
chemical reactions are either..?
A
endothermic or exothermic
2
Q
what is the law of conservation?
A
that matter can neither be created nor destroyed during a chemical reaction, so the mass of the products always equals the mass reactants.
3
Q
what is an endothermic reaction?
A
a reaction in which the reactants absorb energy from the surroundings. eg when you scramble an egg, you add heat energy and the egg solidifies
4
Q
what is an exothermic reaction?
A
a reaction in which energy is given off with the products , usually in the form of heat or light. eg. when you burn wood in a fireplace, heat and light energy is given off.
5
Q
what is activation energy?
A
the amount of energy needed to get a reaction going
