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100
What do we call things in science that we can measure?
What is the name for length, mass, and time?
Physical quantities
100
What can we measure with a ruler?
Length, width, height
100
What can we measure with a clock?
Time (seconds, minutes, hours)
100
What is a device that measures how long something takes
Stopwatch
100
What is SI ?
SI means the International System of Units. It is the modern metric system used all over the world to measure things like length, mass, and time
200
What do we use to measure weight?
Scale
200
Name please three states of matter
Solid, liquid, gas
200
What is the amount of space a substance occupies?
Volume (Âm lượng)
200
What do we use to measure temperature?
Thermometer
200
Why do we use a thermometer?
to measure temperature
300
When you guess a value that is close to the real answer. What is a smart guess? It is not exact, but it is close.
Estimation
300
What is the change of a substance from a solid to a liquid when heat is added?
Melting
300
What word describes something that does not let water pass through it?
Waterproof
300
What is a state of matter that has a fixed shape and a fixed volume
Solid
300
What is a state of matter that has a fixed volume but no fixed shape
Liquid
400
What do we call energy sources like coal, oil, and natural gas that formed from ancient plants and animals?
Fossil fuels
400
What word describes a material you can see through clearly?
Transparent
400
The process is when a liquid becomes a gas because it is heated to its _____ point
Boiling
400
What is the change of a liquid into a solid when the temperature becomes low enough?
Freezing
400
Which word means “easy to shape or bend”?
1. Brittle
2. Hard
3. Malleable
4. Ductile
3. Malleable
500
What is the change of a gas into a liquid when it cools down?
Condensation
500
What word describes a material that can be stretched into a wire without breaking?
Ductile (Dễ uốn)
500
Name the major compositions of the air
Nitrogen (N₂)
Oxygen (O₂)
Argon (Ar)
Carbon dioxide (CO₂)
500
What is a mixture that has the same composition everywhere — you cannot see the different parts because they are evenly mixed
Homogenous mixture
500
What is a mixture where you can see the different parts because they are not evenly mixed?
Heterogeneous mixture