what is it
Which of these is matter?
A. Sound
B. Light
C. Air
D. Heat
air
Which is a physical property?
A. Flammability
B. Color
C. Ability to rust
D. Ability to react with another substance
color
Which state of matter has a definite shape and definite volume?
solid
You cut a piece of paper into four pieces.
Is this a physical change or chemical change?
Physical change
Everything around you is made of tiny particles called ______.
Answer: Atoms/particles.
A pencil, a desk, and the air inside the classroom all have something in common. What is it?
They are all matter and take up space.
A scientist describes a material as:
shiny, hard, gray, and able to conduct electricity.
Is the scientist describing the material's properties or its changes?
properties
Which state of matter takes the shape of its container but keeps approximately the same volume?
liquid
Ice melts.
Physical or chemical change?
Physical change.
Which is smaller?
A. A grain of sand
B. A water droplet
C. An atom
atom
You cannot see the air inside an inflated balloon. How do you know it is there?
It takes up space and has mass. Evidence could include the balloon becoming larger/heavier or pushing against things.
You have two identical-looking white powders. You don't know what they are.
Name two properties you could investigate to help identify them.
Solubility, texture, reaction with water, magnetism, conductivity, etc.
A gas is placed into a small container and then transferred into a much larger container.
What happens to the gas?
It spreads out to fill the available space.
A piece of wood burns and produces ash and smoke.
Physical or chemical change?
chemical
If you cut a piece of paper into smaller and smaller pieces, does the paper eventually stop being made of matter?
No. It remains matter; matter is made of extremely tiny particles.
A student says:
“If I can't see something, it isn't matter.”
Is the student correct? Explain.
Matter can be invisible, such as air or gases.
A material bends when you push it, but it returns to its original shape when you stop.
What property are you observing?
Elasticity/flexibility.
Ice, liquid water, and water vapor are all made of the same substance.
What changes when ice becomes water?
Its state/arrangement and motion of particles change; the substance remains water.
Which one is the strongest evidence that a chemical change has occurred?
A. A substance changed shape
B. A substance changed state
C. A new substance formed
D. A substance was moved
A new substance formed.
Imagine you could zoom in extremely far on a glass of water.
Would you see one continuous piece of water or tiny particles?
tiny particles
You have two identical balloons. One is empty and one is filled with air. You put each on opposite sides of a balance.
Which side goes down, and WHY?
The air-filled balloon goes down because the air has mass.
Two objects have exactly the same size and color.
Can you conclude that they are made of the same material?
Answer: No.
Why?
Different materials can have the same color and size. Scientists need to investigate additional properties.
A student says:
“When water boils, the water disappears.”
What is actually happening?
The liquid water changes into water vapor (a gas). It has not disappeared.
You mix two clear liquids.
Suddenly:
What might these observations tell a scientist?
They are evidence that a chemical reaction/change may have occurred and that new substances may have formed.
A student says:
“When sugar disappears in water, the sugar is gone.”
Do you agree?
Explain what you think is happening.
No. The sugar dissolves and its particles spread throughout the water. The sugar has not simply vanished.