Vocab Quiz - Unit 3

Question 1

natures basic particle

Answer 1

atom

Question 2

the translation o/ a substance or substances into one or more new substances is known as a

Answer 2

chemical reaction

Question 3

mass is neither created nor destroyed during ordinary chemical reactions or physical reaction

Answer 3

law of conservation of mass

Question 4

the fact that a chemical compound contains the same elements in exactly the same proportions by mass regardless of the size of the sample or source of the compound is known as the

Answer 4

law of definite proportions

Question 5

if two or more different compounds are composed of the same two elements then the ratio of the masses of the second element combined with a certain mass of the first element is always a ratio of small whole numbers

Answer 5

law of multiple proportions

Question 6

as the smallest particle of an element that retains the chemical properties of that element

Answer 6

atom

Question 7

very small region located at the center of an atom

Answer 7

nucleus

Question 8

usually one or more neutral particles called

Answer 8

neutrons

Question 9

negatively charged particles

Answer 9

electrons

Question 10

protons neutrons and electrons

Answer 10

subatomic particles

Question 11

glass tubes

Answer 11

cathode ray tubes

Question 12

short ranged proton neutron proton proton and neutron neutron forces hold the nuclear particles together and are refered to

Answer 12

as nuclear forces

Question 13

number of protons of each atom of that element

Answer 13

atomic #

Question 14

atoms of the same element that have different masses

Answer 14

isotroopes

Question 15

total number of protons and neutrons that make up the nucleus of an isotope

Answer 15

mass #

Question 16

general terms for a specific isotope of an element

Answer 16

nucleide

Question 17

1 amu 1/12 mass of carbon 12 atom

Answer 17

atomic mass unit

Question 18

weighed average of the atomic masses of the naturally occurring isotopes of an element

Answer 18

average atomic mass

Question 19

of particles in exactly one mole of a pure substance 6.022 x 10 ^23

Answer 19

avogadro’s number

Question 20

mass of one mole of a pure substance

Answer 20

molar mass