States Of Matter

Question 1

solid

Answer 1

state of matter that has a fixed shape and volume

Question 2

liquid

Answer 2

state of matter that has a fixed volume, but no fixed shape

Question 3

gas

Answer 3

state of matter with no fixed shape or volume

Question 4

proporties

Answer 4

characteristics or features of an object or substance

Question 5

diffusion

Answer 5

the spreading of one substance through another due to the movement of their particles

Question 6

volume

Answer 6

the amount of space taken up by an object or substance

Question 7

melting point

Answer 7

the temperature at which a solid substance turns into a liquid (melts) or a liquid turns into a solid (freezes)

Question 8

boiling point

Answer 8

the temperature at which a liquid changes to a gas

Question 9

precipitation

Answer 9

falling water in solid or liquid form. The type of precipitation depends mostly on the temperature in the clouds and the air around them.

Question 10

meteorologist

Answer 10

scientist who uses observation of the atmosphere to predict or explain the weather

Question 11

particle model

Answer 11

a description of the moving particles that make up all matter and how they behave. The model explains the properties of solids, liquids and gases.

Question 12

expands

Answer 12

increase in size due to the movement of particles in a substance

Question 13

contracts

Answer 13

shorten or become smaller in size

Question 14

alchemists

Answer 14

olden-day ‘chemist’ who mixed chemicals and tried to change ordinary metals into gold. Alchemists also tried to tell the future.

Question 15

investigations

Answer 15

activity aimed at finding information

Question 16

scientists

Answer 16

people skilled in or working in the fields of science; scientists use experiments to find out about the material world around them

Question 17

atoms

Answer 17

a very small particle that makes up all things. Atoms have the same properties as the objects they make up.

Question 18

atomic number

Answer 18

number of protons in the nucleus of an atom. The atomic number determines which element an atom is.

Question 19

chemical symbol

Answer 19

the standard way that scientists write the names of the elements, using either a capital letter or a capital followed by a lowercase letter. For example, carbon is C and copper is Cu.

Question 20

compounds

Answer 20

substance made up of two or more different types of atoms that have been joined (bonded) together

Question 21

bonded

Answer 21

force that holds particles of matter, such as atoms, together

Question 22

mixtures

Answer 22

a combination of substances in which each keeps its own properties

Question 23

hydrogen

Answer 23

the element with the smallest atom. By itself, it is a colourless gas and combines with other elements to form a large number of substances, including water. It is the most common element in living things.

Question 24

oxygen

Answer 24

a gas in the air (and water) that animals need to breathe in; made up of particles with two oxygen atoms. Plants produce oxygen as part of photosynthesis.

Question 25

metals

Answer 25

elements that conduct heat and electricity; shiny solids that can be made into thin wires and sheets that bend easily. Mercury is the only liquid metal.

Question 26

non-metals

Answer 26

elements that do not conduct electricity or heat. They melt and turn into gases easily and are brittle and often coloured.

Question 27

periodic table

Answer 27

a table listing all known elements. The elements are grouped according to their properties and in order of the number of protons in their nucleus.

Question 28

group

Answer 28

in the periodic table of elements, a single vertical column of elements whith a similar nature

Question 29

inert

Answer 29

Not reactive

Question 30

noble gas

Answer 30

elements in the last column of the periodic table. They are extremely inert gases.