science term 1 yr 7 exam 2023 Flashcards
what are the three states of matter?
solids, liquids and gases
what are the properties of solids liquids and gases
solids : they have a fixed shape and cannot flow they cannot be Property:
Gases : They can be compressed or squashed.
Explanation: There are large spaces between particles
.
Liquids :Property: They flow and take the shape of their container.
Explanation: The particles can move around each other.
when liquids are heated what do they become
gases
what is a mixture
A combination of two or more substances which don’t form a new substance
Nitrogen and oxygen both are made up of only one type of particle. They are both existent in air. Are nitrogen and oxygen pure substances or not? Is air a mixture or not?
Nitrogen and oxygen are pure substances
Air is a mixture
if solid contains sand , dead plant matter , water and air , then list states of matter in soil
Solid, liquid and gas
What are some everyday examples of mixtures
Concrete, dirty dishwasher water and milk
How do you identify suspensions?
The components separate out if left to stand
Particles of one component are suspended in the other component
What are colloids?
They are the same as suspensions but however the particles stay suspended.
They don’t separate into their components if left to stand
What is the difference between suspended particles in suspensions and the suspended particles in colloids?
The particles are smaller in colloids than in suspensions.
What is fog classified as?
It’s a colloid that consists of small water droplets in air
Describe the particles in a solution
Particles are mixed together to form a solution
They are too small to see with the naked eye
Provide an example of a solution.
vinegar
How can you distinguish a liquid solution from a colloid?
Liquid solutions are transparent
Dishwashing tablets are used to clean dirty dishes in the dishwasher. When these tablets dissolve in the dishwasher, how would you label dishwashing tablets?
The dishwashing tablets are the solute
