Year 8 Test 2 Flashcards
Properties of solids
Cannot be poured except salt sand and sugar
Fixed shape and volume
Properties of liquids
Has a fixed volume but no fixed shape
When a liquid is poured it will take the shape of the container
If pouring continues it will overflow
Properties of gas
Has no fixed shape or volume
Gases can be compressed
Gases spread out and will not stay in a container unless it has a lid
Fluid
A substance that flows and has no fixed shape, gases and liquids are fluids
Measuring the volume of solids and liquids
The volume of a solid is usually measured in cubic metres
The volume of a liquid is measured in millilitres
How mass is measured
Mass is measured with an electronic scale or beam balance
Boiling
The boiling point of the liquid is the temperature at which the liquid boils the temperature at which a changes from a liquid to a gas. Boiling point of water is that 100 degrees
Freezing
The change of matter from a liquid to a solid. A liquid turns into a solid when the heat is transferred away from it
Condensation
If a gas comes into contact with a cold surface it can turn into a liquid
Sublimation
Sublimation is when a solid goes to a gas state without passing through the liquid state
evaporation
Evaporation occurs when a liquid changes to a gas
For major assumptions of the particle model of matter
- All substances are made up of tiny particles
- the tiny particles are attracted towards of the surrounding particle
- the particles are always moving
- the hotter the substance is the faster the particles move
Gases under pressure
Want to gas is under pressure it will compress Until it is unable to compress more
Scientists
People skilled in or working in the fields of science; scientists use experiments to find out about the material world around them
Properties
Characteristics or features of an object or substance
Diffusion
The spreading of one substance to another due to the movement of their particles
Mass
The quantity of matter in an object (usually measured in grams or kilograms)
Volume
The amount of space taken by an object or substance
Particle model
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
Expands
Increase in size due to the movement of particles in a substance
Contracts
Shorten or become smaller in size
Alchemists
Olden day ‘chemist’ who mixed chemicals and tried to change ordinary metals into gold. Alchemist also tried to tell the future.
Investigation
Activity aimed at finding information
observation
Information obtained by the use of our senses measuring instruments
Compound
Substance made up of two or more different types of atoms that have been joined together
Bond
Force that holds particles of matter such as atoms together
Mixture
A combination of substances in which each keeps its own properties
