Chemistry Additional

Question 1

A compound that dissolves in water to give a solution with a pH lower than 7.

Answer 1

Acid

Question 2

Form salts when then neutralize alkalis

Answer 2

Acid

Question 3

Gives off hydrogen gas when reacts with metals

Answer 3

Acid

Question 4

A compound that contains hydrogen in its formula and produces hydrogen ions when it dissolves in water

Answer 4

Acid

Question 5

The mass of the required chemical obtained after separating and purifying the product of a chemical reaction

Answer 5

Actual yield

Question 6

A compound that dissolves in water to give a solution with a pH higher than 7

Answer 6

Alkali

Question 7

Can be neutralized by an acid to form a salt

Answer 7

Alkali

Question 8

Solutions of these contain hydroxide ions

Answer 8

Alkali

Question 9

A element in group 1 of the periodic table

Answer 9

Alkali metal

Question 10

Reacts with water to form an alkaline solution

Answer 10

Alkali metal

Question 11

A mixture of metals

Answer 11

Alloy

Question 12

Chemicals made by industry of a scale of thousands or millions of tonnes per year. Examples are sulfuric acid, nitric acid, sodium hydroxide, ethanol and ethanoic acid

Answer 12

Bulk chemical

Question 13

A graduated tube with taps or valves used to measure the volume of liquids or solutions during titrations

Answer 13

Burette

Question 14

A chemical that starts or speeds up chemical reactions but is not used up in the process

Answer 14

Catalyst

Question 15

The different chemical forms that an element can take, for example, chlorine can be an atom, a molecule and an ion.

Answer 15

Chemical species

Question 16

The theory that reactions happen when molecules collide. This theory helps to explain the factors that affect the rate of reactions

Answer 16

Collision theory

Question 17

A chemical that may destroy living tissue on contact

Answer 17

Corrosive

Question 18

Strong attractive forces that hold atoms together in molecules. Form between non-metallic elements.

Answer 18

Covalent bonding

Question 19

The outer layer of the lithosphere

Answer 19

Crust

Question 20

A material with molecules, atoms or ions lined up in a regular way

Answer 20

Crystalline

Question 21

A form of carbon with a giant covalent structure which is very hard

Answer 21

diamond

Question 22

a molecule with two atoms

Answer 22

diatomic

Question 23

a conductor made of metal or graphite through which a current enters or leaves a chemical during electrolysis.

Answer 23

Electrode

Question 24

Splitting up a chemical into its elements by passing an electric current through it.

Answer 24

Electrolysis

Question 25

A tiny negatively charged particle which is part of an atom

Answer 25

Electron

Question 26

The force of attraction between objects with opposite electric charges

Answer 26

Electrostatic attraction

Question 27

The point during a titration at which the reaction is just complete

Answer 27

End point

Question 28

A reaction that takes in energy from the surroundings

Answer 28

Endothermic

Question 29

A reaction that gives out energy to its surrounding

Answer 29

Exothermic

Question 30

Chemicals made by the chemical industry in smaller quantities. Used in food additives, medicines and pesticides.

Answer 30

Fine chemicals

Question 31

A 3D arrangement of atoms that are held together by covalent bonds. Silicon dioxide and diamand have this arrangement

Answer 31

Giant Covalent Structure

Question 32

The structure of solid ionic compounds. There are no individual molecules, but millions of oppositely charged ions packed closely together in a regular 3D arrangement

Answer 32

Giant Ionic Lattice

Question 33

The family name of the group 7 elements

Answer 33

Halogens

Question 34

All the water on Earth

Answer 34

Hydrosphere

Question 35

A chemical that shows whether a solution is acidic or alkaline

Answer 35

indicator

Question 36

Does not form a solution in water or other solutes

Answer 36

Insoluble

Question 37

Very strong attractive forces that hold ions together.

Answer 37

Ionic bonding

Question 38

Compounds formed by the combination of a metal and a non-metal. They contain positively charged metal ions and negatively charged non-metal ions

Answer 38

Ionic compound

Question 39

A spectrum made up of a series of lines. Each element has its own characteristic one.

Answer 39

Line spectrum

Question 40

The rigid outer layer of the Earth, made up of the crust and the part of mantle just below it.

Answer 40

Lithosphere

Question 41

A compound of a metal with oxygen

Answer 41

metal oxide

Question 42

Very strong attractive forces that hold metal atoms together. The electrons drift freely around the lattice of positive metal ions and hold the ions together

Answer 42

Metallic bonding

Question 43

A naturally occurring element or compound in the Earth's lithosphere

Answer 43

Mineral

Question 44

A group of atoms joined together.

Answer 44

Molecule

Question 45

A chemical in its liquid state. Above melting point but below boiling point

Answer 45

Molten

Question 46

A reaction in which an acid reacts with an alkali to form a salt

Answer 46

Neutralization reaction

Question 47

A natural mineral that contains enough valuable minerals to make it profitable to mine

Answer 47

Ore

Question 48

A reaction that adds oxygen to a chemical

Answer 48

Oxidation

Question 49

A measure of the efficiency of chemical synthesis

Answer 49

Percentage yield

Question 50

A row in the periodic table

Answer 50

Period

Question 51

A material made up of very long molecules.

Answer 51

Polymer

Question 52

Ions that have lost electrons

Answer 52

positive ion

Question 53

An insoluble solid formed when mixing two solutions

Answer 53

Precipitate

Question 54

A measure of how quickly a reaction happens

Answer 54

Rate of reaction

Question 55

The chemicals on the left hand side of an equation

Answer 55

Reactants

Question 56

A reaction that removes oxygen from a chemical

Answer 56

Reduction

Question 57

You add up the relative atomic masses of the atoms in a chemical formula to get this

Answer 57

Relative formula mass

Question 58

An ionic compound formed when an acid neutralizes an alkali or when a metal reacts with a non-metal

Answer 58

Salt

Question 59

The use of instruments to produce and analyse spectra.

Answer 59

Spectroscopy

Question 60

The area of a solid in contact with other reactants that are liquids or gases.

Answer 60

Surface Area

Question 61

The amount of a product that would be obtained in a reaction if all the reactants were coverted to products.

Answer 61

Theoretical yield

Question 62

A technique used to find the exact volumes of solutions that react with each other.

Answer 62

Titration

Question 63

A chemical that may lead to serious health risks or even death.

Answer 63

Toxic