exothermic and endothermic reactions

Question 1

what type of reaction is wood burning

Answer 1

an exothermic reaction

Question 2

what is the key fact of an exothermic reaction

Answer 2

they transfer energy from the reacting molecules to the surroundings

Question 3

describe the temperature change in an exothermic reaction

Answer 3

the temperature of the surroundings decrease while the temperature of the reacting molecules increases

Question 4

what type of reaction is combustion?

Answer 4

combustion (burning) is an exothermic reaction

Question 5

is oxidation an endothermic or exothermic reaction?

Answer 5

exothermic

Question 6

is neutralisation an exothermic or endothermic reaction

Answer 6

exothermic

Question 7

energy changes that take place in reactions are represented on what diagram

Answer 7

an energy profile diagram

Question 8

describe the energy profile diagram of an exothermic reaction

Answer 8

the products will have less energy than the reactants because energy has been transferred from the reaction to the surroundings

Question 9

why might the products of an exothermic reaction have less energy than the reactants?

Answer 9

because the energy has been transferred from the reaction to the surroundings

Question 10

what does the difference between the energy of the reactants and the energy of the products tell us?

Answer 10

it tells us the energy that has been released to the surroundings

Question 11

how can we label the energy profile diagram to show the change in an exothermic reaction

Answer 11

energy on the y axis
time of reaction on the x acid
reactants have a higher energy level than the products
the difference between them is the energy transferred to surroundings

Question 12

describe the reaction of an endothermic reaction

Answer 12

endothermic reactions take in energy from their surroundings
the temperate of the surroundings decrease and the reactants temperature increases
(thermal decomposition)

Question 13

describe the energy profile for an endothermic reaction

Answer 13

the products have more energy than the reactants because energy has been taken in from the surroundings
the difference in energy between the reactants and the products tells us the amount of energy that has been taken in by the reaction

Question 14

what similarity does the energy profiles of exo and endo have in common

Answer 14

the energy rises to a peak

Question 15

what is the peak on an energy profile?

Answer 15

the activation energy

Question 16

what are the key ideas of reactions occurring

Answer 16

reactions can only occur when the particle collide with eachother with sufficient energy
a minimum amount of energy is required for particles in order to react (the activation energy)

Question 17

how can particles collide together in an energy reaction

Answer 17

with sufficient energy

Question 18

what is the minimum amount of energy that particles must have in order to react called?

Answer 18

the activation energy

Question 19

where is the activation energy represented on an energy profile graph?

Answer 19

from the reactants to the peak of the curve(the difference is the activation energy)