Answer key

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Last edited 26 days ago by Learn LoopHQ.

Chapter: 01. Matter

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Answer in one line - Answer Key

Intermolecular space refers to the empty gaps between molecules, while intermolecular force of attraction is the pulling force that exists between neighboring molecules.

Gases need a closed container because their molecules have negligible intermolecular forces and no fixed volume or shape, causing them to spread out and occupy the entire available space if not contained.

Solids have a fixed shape and volume because their molecules are closely packed with very strong intermolecular forces of attraction that hold them in rigid positions.

Matter is composed of extremely tiny particles, with atoms being the smallest units, and molecules being groups of atoms that combine together.

Democritus proposed that matter is made of small, indivisible particles with empty space between them, and these particles are in constant motion.

Gases have no fixed shape or volume, have significantly larger intermolecular spaces, and their molecules have negligible intermolecular forces of attraction compared to liquids.

All matter has mass and occupies space, which is also known as volume.

Matter is anything that possesses mass and takes up space.

It is easier to break coal than iron because coal has weaker intermolecular forces of attraction compared to the very strong forces present in iron, meaning less energy is required to separate its particles.

In a solid, molecules are very closely packed and cannot move freely from place to place, but instead, they vibrate around their fixed positions.

An iron ball has more mass than a ball of cotton even if it occupies less space because mass is the amount of matter an object contains, and iron packs more matter into a smaller volume than cotton does.

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.

The “Air Occupies Space” activity demonstrates that air, a gas, takes up physical room, as shown by the trapped air in the bottle preventing the balloon from fully inflating.

An example of diffusion of gas into a liquid is oxygen dissolving into water bodies, enabling aquatic animals to breathe.

In gases, the intermolecular forces of attraction are almost negligible, which allows their molecules to move freely and independently, unlike solids and liquids.

Two forms of energy that are often mistaken for matter are heat and light.

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