Defi

Question 1

Acid

Answer 1

Proton donor

Question 2

Base

Answer 2

Proton acceptor

Question 3

Hydrated substance

Answer 3

Is a substance that is chemically combined with water

Question 4

Anhydrous substance

Answer 4

Is a substance containing no water

Question 5

Water of crystallization

Answer 5

Are the water molecules present in hydrated crystals

Question 6

Amphoteric oxides

Answer 6

Oxides that react with acids and bases to produce Salt and water

Question 7

Stone acid

Answer 7

Is ax acid that has completely disassociated in an aqueous solution

Question 8

Weak acid

Answer 8

Is an acid that has partially disassociated in an aqueous solution

Question 9

Element

Answer 9

Consists of one single type of atom

Question 10

Compound

Answer 10

Two more more elements chemicals combined

Question 11

Mixture

Answer 11

Two or more events not chemically combined

Question 12

Atom

Answer 12

A central nucleus containing proteins and neutrons surrounded by electrons in shells

Question 13

Proton number/ atomic number

Answer 13

Number of protons in the nucleus of an atom

Question 14

Mass number/ nucleon number

Answer 14

The number of protons and neutrons on the nucleus of An atom

Question 15

Isotopes

Answer 15

Different atoms of the same element that have the same number of protons but different number of neutrons

Question 16

Ionic bonding

Answer 16

Sting electrostatic forces of attraction between oppositely charges ions

Question 17

Giant lattice structure of an ionic bond

Answer 17

Regular arrangement of alternating positive and negative ions

Question 18

Covalent bond

Answer 18

Formed when a pair of electrons is shared between two atoms leading to noble gas configuration

Question 19

Metallica bonding

Answer 19

Attraction between the positive ions in a giant metallic lattice and a ‘sea‘ of delocalized electrons

Question 20

Molecular formula

Answer 20

The number and type of different atoms present in a molecule

Question 21

Empirical
Formula

Answer 21

Simplest whole number ratio of the atoms or ions in a compound

Question 22

Relative atomic mass

Answer 22

Is the average mass of isotopes of an element compared to 1/12th of the mass of carbon 12

Question 23

Relative molecular mass

Answer 23

The sum of the relative atomic masses

Question 24

The mole/mol

Answer 24

Is the unit of amount of substance, one mole is 6.02 * 10^23 particles ( avagadros constant )

Question 25

Electrochemistry

Answer 25

The decomposition of an ionic compound when molten or in an aqueous solution by the passage of an electric current

Question 26

Anode

Answer 26

Positive electrode

Question 27

Cathode

Answer 27

Negative electrode

Question 28

Electrolyte

Answer 28

Molten or aqueous Ionic compound that undergoes electrolysis

Question 29

The transfer of charge during electrolysis

Answer 29

Includes the movement of electrons in the external circuit and the loss or gain of electrons at the electrodes and the movement of ions in the electrolyte

Question 30

Hydrogen oxygen fuel cell

Answer 30

Uses hydrogen and oxygen to provide electricity with water as the only chemical product

Question 31

Exothermic reaction

Answer 31

Transfers thermal energy to the surroundings leading to an increase in temperature of the surroundings

Question 32

Endothermic reaction

Answer 32

Takes in thermal energy from the surroundings leading to a decrease in temperature of the surroundings

Question 33

Enthalpy change

Answer 33

Transfer of thermal energy during a reaction

Question 34

Activation energy

Answer 34

The minimum amount of energy that colliding particles must have to react

Question 35

Catalyst

Answer 35

Increases the rate of a reaction and is unchanged at the end of a reaction

Question 36

Redox reaction

Answer 36

Involving simultaneous oxidation and reduction

Question 37

Oxidation

Answer 37

Gain of oxygen, loss of electrons, increase in oxidation numbee

Question 38

Reduction

Answer 38

Loss of oxygen, increase in electrons, Decrease in oxidation number

Question 39

Oxidizing agent

Answer 39

A substance that oxidizes anouther substance and is itself reduced

Question 40

Reducing agent

Answer 40

A substance that reduces anouther substance but it itself oxidises

Question 41

Periodic table

Answer 41

An arrangement of elements in periods and groups and in order of increasing proton number/ atomic number

Question 42

Alloy

Answer 42

Mixture of metals with other elements

Question 43

Photosynthesis

Answer 43

Reaction between carbondioxide and water to produce oxygen and glucose in the presence of chlorophyll using energy from light