Chemistry definitions

Question 1

Element

Answer 1

substances made up of only one type of atom

Question 2

Molecule

Answer 2

Two or more atoms covalently bonded together

Question 3

Compound

Answer 3

Two or more different types of atom chemically bonded together

Question 4

Ion

Answer 4

Charged particle that has lost or gained electrons

Question 5

covalent bond

Answer 5

Strong bond formed by sharing a pair of electrons

Question 6

Ionic bond

Answer 6

Strong electrostatic attraction between oppositely charged ions

Question 7

metallic bond

Answer 7

strong electrostatic attraction between a lattice of positive metal ions and a sea of delocalized electrons

Question 8

giant structure

Answer 8

Billions of atoms or ions bonded together

Question 9

Electrolysis

Answer 9

Chemical decomposition through the input of electricity

Question 10

Rate and reaction

Answer 10

Change in amount of reactants or product / time

Question 11

Catalyst

Answer 11

A substance that increases the rate of reaction by offering an alternative route without being used up

Question 12

Activation energy

Answer 12

Minimum amount of energy needed to start a reaction.

Question 13

Exothermic reaction

Answer 13

A reaction that gives out heat energy to the surroundings

Question 14

Endothermic reaction

Answer 14

A reaction that take sin heat energy from the surroundings

Question 15

Ore

Answer 15

A metal compound contained in a rock from which it is commercially viable to extract the metal

Question 16

Reduction

Answer 16

Gain of electron or loss of oxide ion

Question 17

Oxidation

Answer 17

Loss of electrons or gain of oxide ions