Review the key concepts, formulae, and examples before starting your quiz.
🔑Concepts
Matter is defined as anything that has mass and occupies space. Everything we see, touch, or feel is made of matter.
Matter exists in three primary states: Solids, Liquids, and Gases.
Solids have a fixed shape and a fixed volume because their particles are packed very closely together.
Liquids have a fixed volume but no fixed shape. They take the shape of the container they are kept in. For example, water () or milk.
Gases have neither a fixed shape nor a fixed volume. They fill the entire space available to them, like air or steam ( in gaseous state).
Change of State: Matter can change from one form to another by heating or cooling. Melting is the process where a solid turns into a liquid, while freezing is when a liquid turns into a solid.
Evaporation is the process of a liquid changing into a gas upon heating, and condensation is the process of a gas changing into a liquid upon cooling.
📐Formulae
💡Examples
Problem 1:
Identify the state of matter for the following: A wooden block, honey, and oxygen gas.
Solution:
Wooden block is a Solid; Honey is a Liquid; Oxygen is a Gas.
Explanation:
The wooden block has a fixed shape (Solid). Honey flows but has a fixed volume (Liquid). Oxygen spreads to fill any container (Gas).
Problem 2:
Rohan left an ice cube () on the table. After some time, it turned into a small puddle of water. What process took place?
Solution:
Melting
Explanation:
When ice (solid) absorbs heat from the surroundings, it changes its state into water (liquid). This process is called melting.
Problem 3:
If you pour of milk from a bottle into a glass, will the volume change?
Solution:
No, the volume remains .
Explanation:
Liquids have a definite volume, even though they change their shape to match the container they are in.