1 Matter and Measurement Free Online FlashCards

What is matter?

Matter is anything that has mass and occupies space.

How does a pure substance differ from a mixture?

A pure substance has a consistent composition; a mixture combines substances physically.

What defines a physical property?

A physical property can be observed or measured without changing a substance’s chemical identity.

What makes a property intensive?

An intensive property does not depend on the amount of sample; density and temperature are examples.

How are particles arranged and moving in a solid?

A solid has a definite shape and volume; its particles stay close together and vibrate around fixed positions.

Do changes of state alter a substance’s chemical identity?

Melting, freezing, vaporization, and condensation are physical changes of state; by themselves, they do not change chemical identity.

What are the parts of a measurement, and how precise should it be?

A measurement pairs a number with a unit. Record only the precision supported by the measuring instrument.

How do mass and weight differ?

Mass measures the amount of matter; weight is the force of gravity on that mass and can change with gravitational conditions.

What is density, and is it intensive or extensive?

Density is mass per unit volume: $\text{density}=\frac{\text{mass}}{\text{volume}}$. It is an intensive property.

What does a chemical property describe?

A chemical property describes a substance’s ability to change into different substances.

What makes a property extensive?

An extensive property depends on the amount of sample; mass and volume are examples.

How do a liquid’s shape, volume, and particles behave?

A liquid has a definite volume but takes the shape of its container; its close-together particles move past one another.