Matter
What is matter?
Anything that has weight and takes up space.
What is an observation?
Something I can see, hear, smell, taste, or touch.
What are particles?
Tiny pieces of matter too small to see.
What does melt mean?
A solid changes to a liquid.
What tool do we use to measure mass?
Balance/ scale.
Is air matter?
Yes.
What is an inference?
What I think because of what I observe.
How do solid particles behave?
Close together, stay in place.
What does dissolve mean?
Particles spread out in a liquid.
What unit do we use for mass?
grams (g)
Give one example of invisible matter.
Air, oxygen, helium, vapor, etc.
"The water is clear."
Observation or inference?
Observation.
How do liquid particles behave?
Close together, move around.
Sugar in water: melt or dissolve?
Dissolve.
Before mixing = 120 g. After mixing = 120 g. Same or different?
Same.
Why is air matter even though we cannot see it?
Because it has weight and takes up space (balloon experiments).
"I think the salt is still in the water."
Observation or inference?
Inference.
Act like gas particles.
Far apart and moving freely.
Ice-cream in the sun: melt or dissolve?
Melt.
If the mass stays the same after mixing, was matter lost?
No.
True or False: If I cannot see matter, it does not exist. Explain.
False. Matter is made up of tiny particles too small to see; some matter is invisible like some gases.
Give one observation and one inference about salt in water.
Example:
Observation: "I cannot see the salt."
Inference: "I think the salt is still in the water."
What is the difference between solid particles and liquid particles?
Solid particles stay in place, liquid particles move around.
Explain why dissolving and melting are different.
Melting changes a solid to a liquid; dissolving spreads tiny pieces through a liquid.
Salt cannot be seen, but the mass stays the same. What does this show?
The salt is still there even though we can't see it.