Chemistry Definitions

Question 1

Filtration

Answer 1

The separation of soil and water (filtering in a mixture through filter paper to separate the two substances)

Question 2

Residue

Answer 2

The substance trapped in the filterpaper

Question 3

Filtrate

Answer 3

Clearwater that passes through the filter paper

Question 4

Evaporation

Answer 4

Used to separate a soluble solid and a liquid

Question 5

Chromatography

Answer 5

Technic used to separate a mixture of dyes in ink

Question 6

Distillation

Answer 6

Used to separate substances with different boiling points

Question 7

Matter

Answer 7

Anything that occupy space and has mass

Question 8

Particles

Answer 8

Atoms or molecules

Question 9

Sublimation

Answer 9

Change it items from one state to another

Question 10

Element

Answer 10

A substance made up of only one type of atom

Question 11

Molecule

Answer 11

A substance made up of two or more atoms chemically combine together

Question 12

Compound

Answer 12

Two or more elements chemically combine together

Question 13

Mixture

Answer 13

Two or more substances mingled together but not chemically combined

Question 14

Atom

Answer 14

The smallest part of an element that still has the properties of that element

Question 15

Atomic number

Answer 15

The number of protons in an atom of the element

Question 16

Mass number

Answer 16

The total number of protons and neutrons in an atom of the element ( electrons are negligible )

Question 17

Isotopes

Answer 17

Atoms of the same element with a different number of neutrons in the nucleus

Question 18

Noble gases

Answer 18

Un reactive nonmetals which exist as single atoms

Question 19

Solution

Answer 19

When something is dissolved in a liquid

Question 20

Solute

Answer 20

The substance being dissolved

Question 21

solvent

Answer 21

The liquid is the solute is dissolving into

Question 22

Concentrated solution

Answer 22

Lots of solute very little solvent

Question 23

Dilute solution

Answer 23

Lots of solvent very little solute

Question 24

Solubility

Answer 24

The amount of grams of solute that dissolve fully in hundred grams of solvent at a set temperature

Question 25

Saturated solution

Answer 25

Contains as much of the dissolved solute that it can at that temperature

Question 26

Ionic bond

Answer 26

Force of attraction between the negative and positive ion

Question 27

Ion

Answer 27

An atom that has lost or gained electrons

Question 28

Corrosion

Answer 28

A reaction in which a metal slowly reacts with oxygen in the air to form an oxide

Question 29

galvanising

Answer 29

Coating with a layer of zinc

Question 30

Chromium plating

Answer 30

Coating with a shiny layer of chromium

Question 31

Alloy

Answer 31

A mixture of two or more metals

Question 32

Fuel

Answer 32

A substance which burns in oxygen to produce heat

Question 33

Fossil fuel

Answer 33

A fuel formed from the remains of plants or animals

Question 34

Alkalis

Answer 34

Bases soluble in water

Question 35

Indicator

Answer 35

I chemical that changes colour according to whether a substance is an acid or a base

Question 36

Catalyst

Answer 36

A chemical that speed up or slow start a chemical reaction without being changed or used in the process

Question 37

Screening

Answer 37

Removal of waste products from water using a mesh screen

Question 38

Settling

Answer 38

Aliminium sulphate added to water in large tanks causing smaller particles to settle at the bottom

Question 39

Filtration

Answer 39

Water passes through sand to remove smaller particles

Question 40

chlorination

Answer 40

Addition of chlorine to water to kill bacteria

Question 41

Fluoridation

Answer 41

Fluorine added to water to help prevent tooth decay

Question 42

Ion-exchanger

Answer 42

Removes water hardness

Question 43

Hard water

Answer 43

Water containing dissolved compounds

Question 44

Meniscus

Answer 44

Curved surface of a liquid in a vessel

Question 45

Desalination

Answer 45

Process of obtaining freshwater from seawater

Question 46

Electrolysis

Answer 46

Passing electricity through water to split it into two elements