Chemistry H Unit 1 Vocabularies

Accuracy

how close a measurement is to the known, accepted, or correct value

Precision (a)

How close together several measurements are to each other

Precision (b)

How well you know a number, how many significant figures it has

Matter

anything that has volume and mass

Pure substances

elements or molecules that all have the same composition

Mixture

two or more different compounds or elements not chemically combined

Element

a substance made from just one type of atom (it may be one or many atoms

Compound

a substance made from a combination of atoms of different elements

Heterogeneous

different in different parts

Homogeneous

the same all over

Physical properties

characteristics that can be observed without altering the identity of the substance

Chemical properties

characteristics that cannot be observed without altering the identity of the substance

Intensive property

a property that doesn’t depend on the amount that you have

Extensive property

a property that depends on the amount that you have