Review the key concepts, formulae, and examples before starting your quiz.
đConcepts
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.
đFormulae
đĄExamples
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.