AP Chem Ch 1

Accuracy vs. Precision

accuracy: how close experimental value is to accepted value; precision: how closely measured values agree with each other

chemical property

the ability of a substance to undergo a specific chemical change

Compound

substance formed by the chemical combination of two or more elements in definite proportions

Density

Mass per unit volume

Element

A pure substance made of only one kind of atom

extensive property

a property that depends on the amount of matter in a sample

heterogeneous mixture

A mixture in which different materials can be distinguished easily

homogeneous mixture

a mixture in which the composition is uniform throughout

intensive property

a property that depends on the type of matter in a sample, not the amount of matter

physical property

A characteristic of a pure substance that can be observed without changing it into another substance

Qualitative

Data in the form of recorded descriptions rather than numerical measurements.

Quantitative

Data that is in numbers