Chemical changes

Question 1

What is the genral equation for metal oxide?

Answer 1

Metal + Oxygen → Metal oxidee

Question 2

Reaction for metal with water:

Answer 2

Metal + Water → Metal hydroxide + Hydrogen

Question 3

What is reaction for metal and acids :

Answer 3

Metal + acid → Metal salt + Hydrogen

Question 4

What is a displacement reaction?

Answer 4

A more reactive metal can displace a less reactive metal from a compound.

Question 5

What is oxidation?

Answer 5

Oxidation is when a substance loses electrons.

Question 6

What is reduction?

Answer 6

Reduction is when a substance gains electrons.

Question 7

Define endothermic reaction:

Answer 7

endothermic: when the energy to break bonds is higher than the energy released. Therefore, energy is taken in from the surroundings.

Question 8

Define exothermic reaction:

Answer 8

exothermic: The energy released to the surroundings is more than the energy taken in to start the reaction

Question 9

What is activation energy?

Answer 9

The minimum amount of energy reactants must have to initiate a chemical reaction