chem vocab 1

Question 1

physical change

Answer 1

a change from one state (solid or liquid or gas) to another without a change in chemical composition

Question 2

chemical change

Answer 2

process that leads to the chemical transformation of one set of chemical substances to another

Question 3

physical property

Answer 3

a characteristic of a substance that can be observed or measured without changing the identity of the substance

Question 4

chemical property

Answer 4

a property or characteristic of a substance that is observed during a reaction

Question 5

extensive property

Answer 5

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

Question 6

intensive property

Answer 6

do not depend on the amount of substance present

Question 7

heterogeneous mixture

Answer 7

the composition is not uniform throughout the mixture

Question 8

homogeneous mixture

Answer 8

composition is uniform throughout the mixture

Question 9

unit conversion factor

Answer 9

a number used to change one set of units to another, by multiplying or dividing

Question 10

dimensional analysis

Answer 10

problem solving process that establishes relationships between different units of measurement

Question 11

(pure) substance

Answer 11

substances that are made up of only one kind of particle

Question 12

accuracy

Answer 12

how close a measurement’s results come to the true value

Question 13

precision

Answer 13

the reproducibility of a result or measurement

Question 14

mixture

Answer 14

two or more substances that are not chemically combined

Question 15

compound

Answer 15

a substance made up of two or more different chemical elements combined in a fixed ratio

Question 16

element

Answer 16

substance made up of only one type of atom, each with the same number of protons