C2.8 How Fast? How Furious?

Question 1

reaction (chemical)

Answer 1

A process through which chemicals change in some way to make new chemicals.

Question 2

pressure

Answer 2

The force exerted per unit area (e.g. N/m2).

Question 3

activation energy

Answer 3

The minimum energy that is needed to break the existing chemical bonds when two particles collide.

Question 4

precipitate

Answer 4

A solid which forms from a liquid, often when two solutions are mixed.

Question 5

Haber process

Answer 5

The industrial process used to convert hydrogen and nitrogen into ammonia.

Question 6

endothermic reaction

Answer 6

A reaction that takes in energy.

Question 7

concentration

Answer 7

The amount of a substance in a given volume of solution.

Question 8

sensor

Answer 8

A device which detect one form of energy and turns it into electricity.

Question 9

exothermic reaction

Answer 9

A reaction that gives out energy.

Question 10

equilibrium

Answer 10

A balance point.

Question 11

collision theory

Answer 11

The theory of chemical reactions that describes how particles must collide with enough energy to react.

Question 12

enzyme

Answer 12

A biological catalyst.

Question 13

fertiliser

Answer 13

Something which provides the essential minerals that plants need to grow (particularly nitrogen compounds).

Question 14

rate of reaction

Answer 14

The speed at which a chemical reaction progresses; calculated as 1/(the time taken for the reaction to take place) or 1/(the time taken for a given amount of product to form).

Question 15

catalyst

Answer 15

A substance which speeds up a chemical reaction without being used up.

Question 16

calibrated

Answer 16

Set against a known scale.

Question 17

dynamic equilibrium

Answer 17

The equilibrium point in a reversible reaction where the rates of the forward and backward reactions are the same, so the proportions of different substances remain constant.

Question 18

catalytic converter

Answer 18

A device fitted to vehicle exhausts which uses a catalyst to convert dangerous exhaust gases into less harmful gases.

Question 19

organic

Answer 19

To do with living processes.

Question 20

surface area

Answer 20

The surface of a solid that is available for chemical reactions.

Question 21

reversible

Answer 21

A chemical reaction that can be made to work in either direction.