ICSE Class 7 Chemistry — Flashcards for Quick Revision

A: Matter is anything that has mass, occupies space, and can be perceived by our senses. Air is also matter because it can be felt and it occupies space.

A: Mass is the quantity of matter a body contains. Volume is the space occupied by a body.

A: When marbles are added to water, the water level rises because the marbles occupy space. When the glass is weighed again, the mass increases because marbles have mass. This proves that matter has mass

A: A physical change is a temporary change in which no new substance is formed and the chemical composition remains the same. Only physical properties like colour, state, shape, or size may change.

A: A chemical change is a permanent change in which new substance(s) are formed. The new substance has properties that are completely different from the original substance. A chemical change is also call

A: Melting of ice is a physical change because only the state changes from solid to liquid. No new substance is formed, and water can freeze back into ice again.

A: An element is a pure substance that cannot be converted further into anything simpler than itself by any physical or chemical process. All atoms in an element are identical. Example: iron, copper, alu

A: A compound is a pure substance formed by the chemical combination of two or more elements in a fixed ratio by mass. It can be broken down only by chemical means. Example: water is a compound of hydrog

A: A mixture is an impure substance formed by mixing two or more pure substances in any proportion without chemical change. The substances keep their own properties. Example: air, soil, salt solution.