Properties of Matter Quiz

Grade 5 · Science · Quiz

Test your understanding of physical and chemical properties, states of matter, and density.

Questions

1. Which of the following is a physical property of water?

   1. Water reacts with sodium metal explosively
   2. Water conducts electricity when pure
   3. Water has a boiling point of 100°C at sea level
   4. Water rusts iron over time
   Show answer

   Answer: Water has a boiling point of 100°C at sea level

   Boiling point is a physical property — it can be measured without changing water into a new substance. Rusting and reacting with sodium are chemical properties.

2. A metal block has a mass of 200 g and a volume of 25 cm³. What is its density?

   1. 4 g/cm³
   2. 8 g/cm³
   3. 25 g/cm³
   4. 175 g/cm³
   Show answer

   Answer: 8 g/cm³

   Density = Mass ÷ Volume = 200 g ÷ 25 cm³ = 8 g/cm³. This matches the density of iron, a common metal.

3. Which state of matter has particles that are close together but able to flow and change shape?

   1. Solid
   2. Liquid
   3. Gas
   4. Plasma
   Show answer

   Answer: Liquid

   In a liquid, particles are close together (unlike a gas) but can move past each other freely, allowing liquids to flow and take the shape of their container.

4. The chemical property of flammability can be observed just by looking at a substance without any reaction.

   Show answer

   Answer: False

   Chemical properties like flammability can only be observed when a chemical change actually occurs. You must try to burn a substance to observe whether it is flammable.

5. An ice cube melts in your hand. What change of state is this?

   1. Freezing
   2. Evaporation
   3. Condensation
   4. Melting
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   Answer: Melting

   Melting is the change of state from solid to liquid caused by adding heat energy. The ice absorbs heat from your hand and its particles gain enough energy to flow.

6. Oil (density 0.9 g/cm³) and water (density 1.0 g/cm³) are mixed. What happens?

   1. They mix completely and form one layer
   2. Oil sinks below the water
   3. Oil floats on top of the water
   4. Water evaporates immediately
   Show answer

   Answer: Oil floats on top of the water

   Oil (0.9 g/cm³) is less dense than water (1.0 g/cm³), so it floats on top. Substances always layer with the least dense on top and most dense on the bottom.

7. The ability of a substance to dissolve in water is called its ________.

   Show answer

   Answer: solubility

   Solubility is a physical property describing how much of a substance (solute) can dissolve in a given solvent at a specific temperature.

8. Which of the following physical properties would best help a scientist identify an unknown pure metal?

   1. Its color alone
   2. Its density, melting point, and hardness combined
   3. Whether it changes color in sunlight
   4. Its size and shape
   Show answer

   Answer: Its density, melting point, and hardness combined

   Using multiple physical properties together (density, melting point, hardness) is more reliable for identification than any single property, especially since different metals can share one property.

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