E. State whether the following statements are true or false. If false, rewrite the correct form of statements. 1. A piece of wood and a piece of copper having same mass will have same volume. 2. The SI unit of density is kg/m2 3. Density of a liquid increases with an increase in temperature. 4. Density of ice is greater than the density of water. 5. 1 kg/L = 1000 kg/m3. 6. A ship floats on water because effective density of the ship is less than the density of water. 7. A density bottle can be used to determine the density of a liquid. 8. Relative density of a substance is measured in kg/m? 9. A hydrometer is used to determine purity of a sample of milk. 10. A hydrogen gas balloon floats in air because density of hydrogen is less than the density of air.
Answers
Explanation:
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Lesson 3.1
What is Density?
Key Concepts
Density is a characteristic property of a substance.
The density of a substance is the relationship between the mass of the substance and how much space it takes up (volume).
The mass of atoms, their size, and how they are arranged determine the density of a substance.
Density equals the mass of the substance divided by its volume; D = m/v.
Objects with the same volume but different mass have different densities.
Summary
Students will observe a copper and an aluminum cube of the same volume placed on a balance. They will see that the copper has a greater mass. Students will try to develop an explanation, on the molecular level, for how this can be. Students are then given cubes of different materials that all have the same volume. Students determine the density of each cube and identify the substance the cube is made from