It’s a combination of two or more substances called components. These components can be separated by physical means.
What are the two types of mixtures? Describe them with examples.
Homogeneous mixtures: We can’t distinguish the different components that make up the mixture. Heterogeneous mixtures: We can distinguish the components.
What is melting? Give an example.
when a solid changes to a liquid.
Describe gases
Atoms have a lot of space between them that is why they move a lot and they completely fill a container. They have a lot of energy
What is evaporation? Give an example.
when a liquid changes to a gas
Which state of matter is this?
Liquid
What is pure substance?
It consists of just a type of atom like hydrogen (H) or just a type of molecules like water (H2O).
How do we use evaporation to separate mixtures?
Describe solids.
Atoms are very close one to each other so they tend to stay in the same place. They have just a little energy.
What is filtration?
We use it to separate a solid from a liquid. Ex: orange juice and pulp.
Describe liquids
Atoms have a small space between them so they can move a little taking the shape of their container. They have some energy.
What is sublimation? Give an example.
Sublimation is the change of a solid into a gas.
Name the different methods of separating mixtures.
magnetism, filtration, evaporation, destilation
What is deposition? Give an example.
When a gas changes into a solid.
How can matter change from one state to another?
When we change the temperature of matter, atoms move and change their position.
Which state of matter is this?
Gas
Describe destilation as a way of separating mixtures.
It uses heat to separate two liquids from a solution. It uses condensation to collect the liquid components from the solution...
Why do we use magnetism?
We use it to separate components in a mixture that display magnetic and non-magnetic properties. E.g. sand and coins
What is matter? What is it made of?
Matter is everything around us that has a mass and occupies a space. It is made up of tiny particles called atoms.
What is condensation? Give an example.
When a gas changes to a liquid.
What are the two types of pure substances?
Elements which are made of one type of atom (e.g. hydrogen, copper). Compounds which are made of more than one type of atom (water, ammonia)
What are the three different states of matter?
solids, liquids and gases
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