exothermic and endothermic reactions

Question 1

what is an exothermic reaction

Answer 1

-transfers heat energy from the chemical to the surroundings, they give out heat energy
-rise in temperature

Question 2

give an example of a exothermic reaction product

Answer 2

handwarmers

Question 3

what is an endothermic reaction

Answer 3

-heat energy is transferred from the surroundings to the chemicals
-they take in heat energy

Question 4

if a reversible reaction is exothermic in one direction, then what reaction is it in the opposite reaction

Answer 4

endothermic reaction

Question 5

a white powder dissolves in a solution. The temperature falls by 2 degrees Celsius.
state and explain the type of reaction that has been taken place

Answer 5

endothermic reaction because heat energy is taken from the surroundings

Question 6

what is activation energy

Answer 6

the minimum amount of energy to break bonds to start a reaction

Question 7

how can energy changes in a chemical reaction be shown

Answer 7

using a reaction profile or energy level diagram

Question 8

describe the reaction profile for an exothermic reaction

Answer 8

the products have less energy than the reactants

Question 9

describe the reaction profile for an endothermic reaction

Answer 9

the products have more energy than the reactants

Question 10

why are catalysts used

Answer 10

reduce the activation energy needed for a reaction, this makes the reaction go faster