Chemistry Yr 11 Aut1

Question 1

Oxidation

Answer 1

Loss of electrons

Question 2

Reduction

Answer 2

Gain of electrons

Question 3

Cathode

Answer 3

Negative electrode

Question 4

Anode

Answer 4

Positive electrode

Question 5

Order of discharge at anode during electrolysis when water is involved

Answer 5

Halide ion -> hydroxide -> all other negatively charged ions

Question 6

Activation energy

Answer 6

Minimum energy needed to break bonds to start a reaction

Question 7

Energy change =

Answer 7

Energy used to break bonds - energy used to make bonds.

Question 8

Endothermic reaction

Answer 8

Reaction which takes in energy from surroundings (surroundings get colder)

Question 9

Exothermic reaction

Answer 9

Reaction that releases energy to the surroundings (surroundings get hotter)

Question 10

Successful collision

Answer 10

When two particles collide with enough energy to create a new substance, meaning the energy of the collision is greater than the activation energy.

Question 11

Rate =

Answer 11

Amount of product produced or reactants used up / time taken

Question 12

If the energy change is negative then the reaction is…

Answer 12

Exothermic

Question 13

If the energy change is positive then the reaction is…

Answer 13

Endothermic

Question 14

If the surroundings get warmer during a reaction then the reaction is…

Answer 14

Exothermic

Question 15

If the surroundings get colder during a reaction then the reaction is…

Answer 15

Endothermic

Question 16

Test for Presence of chlorine

Answer 16

Damp litmus paper becomes lighter.

Question 17

Test for presence of hydrogen

Answer 17

Squeaky pop test using burning splint

Question 18

Test for presence of oxygen

Answer 18

Glowing splint relights