States of Matter
What happens to air particles when air is pumped into a basketball?
They expand to fill the space but are too small to see.
What property measures how well a material conducts heat?
thermal conductivity
What is one way to improve an experiment testing heat in materials of different sizes?
Use the same size material each time.
Which material has the highest thermal conductivity: aluminum, copper, paper, or wood?
Copper
What tool measures temperature?
Thermometer
When salt water is heated, what happens to the salt?
The water evaporates, leaving the salt behind.
What does “malleability” mean?
the ability to change shape under stress without breaking
Why do scientists test materials multiple times?
To make results more reliable.
Which material does not reflect light and breaks easily?
Marble
What tool measures the weight of an object?
A scale
True or False: Air has a fixed shape.
False — air expands to fill space.
Which property tells whether something reflects light?
reflectivity
When students test salt water over heat, what kind of change occurs?
A physical change (water evaporates).
Which materials would be best for a box that doesn’t reflect light and has low conductivity?
Marble and wood
What do you use to fill a soccer ball?
An air pump
Which state of matter has particles that move freely and spread apart?
Gas
Which two properties are common to metals?
conductivity and reflectivity
What should a student use to measure the weight of an object?
A scale (grams or kilograms).
Which metal is both magnetic and conducts electricity well?
Iron or nickel
What tool measures how much space something takes up? What tool do we use to measure water?
Graduated Cylinder
Give one example that shows particles are too small to be seen.
blowing up a balloon, sugar dissolving in water, a tire filling up with air, a basketball inflating with air
Why would a scientist choose copper to make a pot?
It has a high thermal conductivity and heats up quickly.
What should a student use to measure the temperature of an object?
A thermometer (in °C).
What makes a metal a good conductor of heat and electricity? (Hint: Think about how the particles)
Its particles allow energy to move easily.
What tool would you use to separate dissolved salt from water? (Hint: How could we make the water disappear)
Heat or evaporation dish setup