key words test 3

Question 1

a substance made up of only one type of atom

Answer 1

element

Question 2

an element that occurs naturally

Answer 2

native element

Question 3

two or more elements chemically joined together like water

Answer 3

compound

Question 4

the basic building block of an element that cannot be broken down

Answer 4

atom

Question 5

a table of all the known elements in order of atomic number

Answer 5

periodic table

Question 6

a horizontal row of elements in the pt

Answer 6

period

Question 7

a vertical column of the elements in the pt

Answer 7

group

Question 8

the number of an element in the pt

Answer 8

atomic number

Question 9

the number related to the mass of one atom in an element

Answer 9

atomic mass

Question 10

able to be stretched out to a thin wire

Answer 10

ductile

Question 11

able to be bent without breaking

Answer 11

malleable

Question 12

to make a sound like a bell when hit

Answer 12

sonorous

Question 13

a material that allows heat to pass easily

Answer 13

conductor

Question 14

a group of non-metal elements

Answer 14

halogen

Question 15

the type of chemical compound which is the product of a neutralisation reaction

Answer 15

salt

Question 16

am unreactive substance in group 8 of the pt

Answer 16

noble gas

Question 17

to be chemically unreactive

Answer 17

inert

Question 18

when an element shows the properties of metals and non-metals

Answer 18

metalloid

Question 19

a material used in electronic circuits

Answer 19

semiconductor

Question 20

when a solvent evaporates to leave crystals of solid

Answer 20

crystalline

Question 21

the description of a material that emits nuclear radiations

Answer 21

radioactive

Question 22

to get a metal from an ore

Answer 22

extraction

Question 23

the rock from which a metal is extracted

Answer 23

ore

Question 24

to separate using electricity

Answer 24

electrolysis

Question 25

the chemical process that reduces the amount of oxygen in a compound

Answer 25

reduction

Question 26

the temperature at which a solid changes state to a liquid

Answer 26

melting point

Question 27

poisonous

Answer 27

toxic

Question 28

the mass of a material per unit volume

Answer 28

density

Question 29

a diagram or three dimensional object that makes an idea easier to understand

Answer 29

model

Question 30

a link between two values e.g. 2:1

Answer 30

ratio

Question 31

the chemical symbols and numbers that show how many atoms of each element a substance contains

Answer 31

formula

Question 32

two or more atoms held together by strong chemical bonds

Answer 32

molecule

Question 33

a process which changes substances by the rearrangement of their atoms

Answer 33

reaction

Question 34

a chemical reaction written in terms of reactants and products

Answer 34

chemical equation

Question 35

a material that is burned for the purpose of generating heat and energy

Answer 35

fuel

Question 36

the reaction of fuels with oxygen that produces heat and energy

Answer 36

burning

Question 37

substance that has a pH lower than 7

Answer 37

acid

Question 38

a substance formed from a chemical reaction

Answer 38

product

Question 39

reacts with an acid to neutralise it

Answer 39

base

Question 40

a type of compound contains carbon and oxygen

Answer 40

carbonate

Question 41

a food group containing starches and sugar

Answer 41

carbohydrate

Question 42

a compound that contains carbon

Answer 42

organic compound

Question 43

a large molecule made up of a very long chain of smaller molecules

Answer 43

polymer

Question 44

when a substance reacts with oxygen and increases the amount of oxygen in a compound

Answer 44

oxidation

Question 45

unlikely to break up

Answer 45

stable

Question 46

when one substance is changed into at least two substance due to heating

Answer 46

thermal decomposition

Question 47

starting substances in a chemical reaction

Answer 47

reactants