States of Matter
What are the three states of matter?
Solid, liquid and gas.
What change of state occurs when a solid becomes a liquid?
Melting
What does density measure?
How compact a substance is (mass per volume).
What is a mixture?
A combination of different pure substances.
What is the colour of my water bottle
Green
Which state of matter has a fixed shape and fixed volume?
Solid
Which two changes of state require energy to be added?
Melting and evaporating.
Write the formula for density
Density = Mass รท Volume
What is a pure substance?
A substance made of only one type of substance
What house was I in?
Hindley
Which state of matter can be squashed (compressed)?
Gas
During freezing, what happens to the particles?
They slow down and move closer together.
Which is denser: fresh water or salt water?
Salt Water
What is a solution?
A mixture where a solute dissolves in a solvent
What is my favourite Science?
Using the particle model, explain why liquids have no fixed shape but a fixed volume.
The particles can move past one another, so they take the shape of the container, but the particles remain close together so the volume stays the same.
During evaporation, how do particle movement and spacing change?
Particles gain energy, move faster and spread further apart.
Two objects both have a mass of 1 kg one is a large box and the other is a small box. Which one is denser
The small box because its particles are packed more closely together.
What is the difference between a solute and a solvent?
A solute is the substance being dissolved, while the solvent is the substance that dissolves it
What is my favourite sport?
Tennis
Use the particle model to explain why gases can be compressed but solids cannot.
Gas particles are far apart with lots of empty space, so they can be pushed closer together. Solid particles are tightly packed with almost no empty space.
A cold drink forms water droplets on the outside. What change of state is occurring, and why?
Condensation. Water vapour loses energy, slows down and changes into liquid water.
A substance has a mass of 150 g and a volume of 50 mL. What is its density?
3 g/mL
How can you make a solution more concentrated?
Add more solute to the same amount of solvent.
How many times have I broken my wrists?