Answer key

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Last edited 26 days ago by Learn LoopHQ.

Chapter: 01. Matter

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Section A: Multiple Choice Questions (MCQs) - Answer Key

c) Matter

b) Atom

b) Intermolecular space

b) Liquid

c) Large intermolecular spaces

Section B: Fill in the Blanks - Answer Key

mass

molecules

cohesive force (or intermolecular force of attraction)

liquids, gases

plasma

Section C: True or False - Answer Key

False

True

Section D: Short Answer Questions - Answer Key

The two common properties of all matter are that it has mass and it occupies space.

Two examples of solids are chairs and ice. (Other valid examples include computers, blackboards, books, etc.)

Liquids take the shape of their container because their intermolecular forces of attraction are weaker than solids, allowing their molecules to move past each other and adapt to the container’s form.

Diffusion is the process where a substance spreads out and mixes with another substance due to the random motion of its particles.

Higher temperatures increase the rate of diffusion because particles gain more energy and move faster, causing them to spread out and mix more quickly.

Section E: Diagram-Based Questions - Answer Key

The experiment primarily demonstrates the properties of gas.

The balloon does not inflate completely because the air already present inside the bottle occupies the available space. This trapped air prevents the balloon from expanding fully.

This experiment proves that gas occupies space (or has volume).

Section F: Long Answer Questions - Answer Key

Solids have molecules that are very closely packed with very little intermolecular space, leading to extremely strong intermolecular forces that hold them in rigid positions. Liquids have molecules that are less closely packed than solids, resulting in more intermolecular space and weaker intermolecular forces, which allows them to slide past each other. Gases have molecules that are very loosely arranged with large intermolecular spaces and negligible intermolecular forces, allowing them to move freely and randomly throughout the entire space.

An iron ball has more mass than a ball of cotton, even if the cotton ball occupies more space, because mass is the amount of matter an object contains. Iron is a much denser material than cotton, meaning it packs more matter (atoms and molecules) into a smaller volume. Therefore, even a small iron ball contains a greater amount of “stuff” or mass compared to a much larger, less dense ball of cotton.

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