Different states of matter have different densities.
Which of the following shows the states of matter in density order, starting with the lowest density?
Solid – liquid – gas
Solid – gas – liquid
Gas – liquid – solid
Liquid – gas – solid
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A sealed boiling tube contains gas.
The boiling tube is heated.
What happens?
The particles in the gas evaporate.
The particles in the gas expand.
The particles in the gas move faster.
The particles in the gas move slower.
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A piece of metal has a volume of 2.0 × 10-5 m3.
The density of the metal is 8.0 × 103 kg/m3.
What is the mass of the metal?
2.5 × 10-3 kg
4.0 × 10-2 kg
1.6 × 10-1 kg
1.6 × 103 kg
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An object has a volume of 1.5 m3 and a mass of 3.0 kg.
What is the density of the object?
Use the equation: density = mass ÷ volume
0.5 kg/m3
2.0 kg/m3
4.5 kg/m3
6.0 kg/m3
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A graduated syringe contains air at room temperature.
The syringe is put in a freezer to cool it down.
When it is removed from the freezer, the piston has moved inwards.
The density of the air in the syringe when cooled is 2.4 kg/m3.
What was the density of the air at room temperature?
0.6 kg/m3
1.2 kg/m3
2.4 kg/m3
4.8 kg/m3
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The atomic model has changed over time.
Why did the model need to change over time?
Models only have a finite lifetime
Computers were invented
The older models could not explain new evidence
Peer review
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