Ch 3

Question 0

What does mass number tell you?

Answer 0

Number of protons + neutrons

Question 1

Atomic number tells you..

Where is it?

Answer 1

Number of protons

Upper left corner

Question 2

Where are protons neutrons and electrons

Answer 2

Protons and neutrons are in nucleus and electrons are on outside

Question 3

What is the relationship between protons and neutrons?

Answer 3

Same number of everything, different charges

Question 4

What is on bottom left corner of an element?

Answer 4

Average atomic mass

Question 5

What is in upper right?

Answer 5

Numbers of electrons, in circle

Question 6

Mendeleev

Answer 6

Used playing cards, put them in order

Question 7

Democritus

Answer 7

Greek, came up with idea of the atom

Question 8

John dalton

Answer 8

Came up with modern atomic theory,

Question 9

Thompson

Answer 9

Discovered the electron

Question 10

Law of conservation of mass

Answer 10

States that during a chemical reaction the total mass of the products must be equal to the total mass of the reactants. ( no matter is created or destroyed during chemical reactions)

Question 11

Law of definite portions

Answer 11

States that a given chemical compound always contains the same elements in the exact same proportions by mass.

Question 12

Law of multiple proportions

Answer 12

Whenever the same two elements form more than one compound, the different masses of one element that combine with the same mass of the of the element are in the ratio of small whole numbers.

Question 13

Daltons atomic theory

Answer 13

1. All matter is composed of atoms
2. Atoms of the same element are identical
3. Atoms of different elements can chemically combine with one another to form compounds.
4. Chemical reactions can be defined as the separation, combination, or rearrangement of atoms.

Question 14

Atom

Answer 14

Smallest particle of an element

Question 15

Cathode ray tube

Answer 15

An electric current is passed through gasses at a low pressure ( JJ Thompson used it)

Question 16

Electrons

Answer 16

Negatively charged particles present In all atoms

Question 17

Robert Millikan

Answer 17

Determined the charge of a single electron (used oil drop experiment)

Question 18

Eugene Goldstein

Answer 18

Discovered evidence for the proton

Question 19

Proton

Answer 19

Positively charged particle present in all atoms

Question 20

Neutron

Answer 20

Particle with no charge with mass the same as a proton

Question 21

Nucleus

Answer 21

Tiny, dense, central core of the atom and is composed of protons and neutrons.

Question 22

Mass number

Answer 22

Total number of protons and neutrons in an atom

Question 23

Isotopes

Answer 23

Atoms with the same atomic number but different mass number because of a change in the number of neutrons.

Question 24

Nuclide

Answer 24

Nucleus of a given isotope of an element

Question 25

Atomic mass unit

Answer 25

Standard is carbon-12

Question 26

Atomic mass

Answer 26

Weighted average of the atomic masses of the naturally occurring isotopes of that element.

Question 27

To find average atomic mass,

Answer 27

Find known things, multiply atomic mass by % abundance, add to answers together.

Question 28

Mole

Answer 28

A name give to a group of 6.02 x 10^23 items

Question 29

Avagadros number

Answer 29

6.02x 10^23

Question 30

Representative particle

Answer 30

The smallest unit if a substance that retains its chemical identity

Question 31

Molar mass

Answer 31

The mass of one mole of representative particles of a substance

Question 32

Isotope

Answer 32

Same atom with different number of neutrons which makes mass larger