Mass
What unit do we often use to measure masses?
Grams (g)
What unit do we use for liquid volume in class?
millilitres (mL)
Which is more compressible: air or water?
air
What are all materials made of, according to the particle model?
matter/particles/atoms
What is density?
Density is how much matter is packed into a certain amount of space.
How many grams are in 1 kilogram?
1000g
How many millilitres are in one litre?
1000 mL
What does compressible mean?
It means you can push the substance into a smaller space.
Which state has particles that vibrate in place?
solids
Why does a piece of wood float on water while a rock sinks?
Wood is less dense than water, while rock is more dense than water.
What does mass tell us?
How much matter is in an object.
Name one tool to measure liquid volume.
graduated cylinder
Why are gases easier to compress than liquids?
Gas particles have big spaces between them.
Which state has the weakest attraction between particles: solid, liquid, or gas?
gas
If you cut a block of wood in half, will the pieces have the same density as the original block?
Yes. The size changes, but the density stays the same.
A beaker holds 150 g of sand and 350 g of water. What is the total mass in grams?
150 g+350 g=500 g.
How can you find the volume of a small rock?
Use water in a graduated cylinder and measure how much the water level rises.
What happens to gas when you squeeze it? Use particles in your answer.
Particles move closer together and the gas takes up less space.
Which state of matter has a definite shape that does not change unless you cut or break it?
Solid
An object sinks in water but floats in honey. What can you infer about the object's density?
The object is more dense than water but less dense than honey.
You have a rock that weighs 3 kg and a toy that weighs 2500 g. Which one is heavier?
The rock is heavier. It weighs 3000g.
A graduated cylinder shows 60 mL of water. After you drop a small rock in, the water level rises to 85 mL. What is the volume of the rock?
85 mL−60 mL=25 mL
Explain why hydraulic machines (like a car jack or hydraulic lift) use liquids instead of gases, using the idea of compressibility.
Liquids are hard to squeeze (not very compressible), so when force is applied to a liquid it passes the pressure through the liquid and moves parts of the machine; gases would get squished and not transmit the force well.
Which state of matter has a definite volume, but and indefinite shape?
liquid
In the density tower experiment, order water. honey, and oil from least to most dense.
oil, water, honey