Test: Solids, Liquids & Gases - 1 - Class 5 MCQ

Evaporation is the process of changing a liquid into a gas on heating.

• States of matter refer to distinct forms that different phases of matter take on, primarily solid, liquid, and gas.
• Energy, however, is not a state of matter; it is a measurable property that can affect how matter behaves.
• For example, adding energy (like heat) can change a solid to a liquid (melting) or a liquid to a gas (evaporation).

Burning of wood is a chemical change as it results in the formation of new substances like ash and gases, and cannot be reversed.

In gases, the molecules are far apart and move quickly in all directions, with very weak forces between them. This allows them to spread out and fill any container or space available.

In simple words: In solids, molecules are tightly packed together, not allowing them to move freely. This closeness gives solids their definite shape and volume.

• Ice cubes float in a tumbler of soft drinks because they are lighter than water.
• This happens because ice is a special kind of solid that is less dense than liquid water.
• When water freezes into ice, it expands and becomes less heavy, making it float on top of the liquid water.
• So, when you see ice cubes floating in your drink, it's because ice is lighter than the liquid it's in.

Melting is the process of changing a solid into a liquid on heating.

• When you open a bottle of a fizzy drink like cola, the bubbles that come out are not water vapor bubbles. They are bubbles of carbon dioxide gas. So, the correct answer is False.
• Fun Fact: Fizzy drinks are a solution of the gas carbon dioxide in water, which gives them their bubbly nature!

Rusting of iron is a chemical change because it involves a reaction between iron and oxygen, resulting in the formation of a new substance (iron oxide).

• Atoms are like the tiniest building blocks of everything around us.
• Just like how Lego blocks help us build fun things, atoms are like the Lego blocks of matter, which is everything that has mass and takes up space.
• So, atoms are the smallest units of matter that make up everything we see and touch.