Test 1 Definitions

Question 1

Chemistry

Answer 1

the study of matter and changes matter undergo

Question 2

Matter

Answer 2

anything that has mass or occupies space

Question 3

Pure Substances

Answer 3

can’t be separated into other substances by chemical means

Question 4

Mixture

Answer 4

made of 2 or more pure substances

Question 5

Element

Answer 5

matter that cannot be broken down into two or more pure substances

Question 6

Compound

Answer 6

made of two or more elements combined in a definite way

Question 7

Homogeneous mixture

Answer 7

solutions; mixture that has uniform appearance and composition

Question 8

Heterogenous mixture

Answer 8

mixture that doesn’t have uniform appearance

Question 9

Meter

Answer 9

distance light travels in a vacuum in 1/299,792,458th of a second

Question 10

Avagadro’s Number

Answer 10

6.022 x 10^23: the number of units in a mole

Question 11

Atomic Theory

Answer 11

Dalton’s theory of the atomic nature of matter.

Question 12

Atom

Answer 12

smallest particle of an element that can enter into a chemical reaction

Question 13

Electrons

Answer 13

Negatively charged components of an atom

Question 14

Law of Conservation of Mass

Answer 14

States there is no detectable change in mass in an ordinary chemical reaction

Question 15

Law of Constant Composition

Answer 15

States that a compound always contain the same elements in the same proportions by mass

Question 16

Earnest Rutherford

Answer 16

found nucleus by using the gold foil method; shaped the ideas about the nature of the atom

Question 17

Nucleus

Answer 17

small, dense, positively charged region at the center of the atom

Question 18

Proton

Answer 18

nucleus of the hydrogen atom