UNIT 3 TEST REVIEW

Question 0

Dalton

Answer 0

FATHER OF THE MODERN ATOMIC THEORY

1. All matter is made of atoms
2. Atoms of the same element are identical( wrong)
3. Atoms of different elements can physically mix together
4. Chemical reactions occur when atoms are separated

Question 1

Democritus of Abdera

Answer 1

Created the idea of the tiny fundamental particles that make up all matter: the atom

Question 2

Sir william crookes

Answer 2

Cathode ray tube

Question 3

Jj. Thomson

Answer 3

Discovered the electron (1897)

-pudding model

Question 4

Rutherford

Answer 4

Discovered the nucleus- shot alpha particles (+charges) at a very thin piece of gold foil called the “gold foil experiment” rays rebounded back

Question 5

Chadwick

Answer 5

Discovered the neutron

Question 6

Bohr model

Answer 6

Only worked for hydrogen

Levels of electrons

Question 7

What if they lose or gain electrons.

Answer 7

Ion=an atom or group of atoms that gains pr loses electrons. Charges are used to indicate whether it is a positive or negative ion.

1. +=cation
2. -=anion

Question 8

Mendeleev

Answer 8

FATHER OF THE PERIODIC TABLE

The properties of elements are repeated according to their atomic mass

Question 9

Mosley

Answer 9

Determined the number of protons in each element by bouncing X-rays on metal targets. Therefore today is arranged by the number of protons or atomic number

Question 10

Electron

Answer 10

Takes up most of the volume of the atom

Question 11

Z

Answer 11

Atomic #

Question 12

A

Answer 12

Mass #

Sum of protons and neutrons in nucleus

Question 13

X

Answer 13

Chemical symbol or name

Question 14

Attractions

Answer 14

1. +-+
2. O-+
3. O-O

Question 15

Isotopes

Answer 15

Atoms of the same element with different number of neutrons

Question 16

Coal/natural gas

Answer 16

Running out- lots of waste

Question 17

Solar

Answer 17

Expensive
Panels damaged by weather
Irradiated to nuclear waste

Question 18

Hydroelectric

Answer 18

Water

Not every place has enough

Question 19

Wind

Answer 19

No wind = no power

Question 20

Geothermal

Answer 20

Great- need technology to get out

Question 21

Nuclear

Answer 21

Energy of the future
Good
Clean
Little waste
DANGEROUS

Question 22

Why radioactive?

Answer 22

Because they have unstable nuclei

Question 23

Transmutation

Answer 23

Transformed into a different element entirely

Question 24

Alpha radiation

Answer 24

``` +2 charge Mass of 4 1/10th the speed of light Low penetrating power Dangerous to ingest can penetrate soft tissue rays ```

Question 25

Beta radiation

Answer 25

-1 charge Has a mass of 1/1837 amu Formed by decomposition of neutrons Moderate pp

Question 26

Gamma radiation

Answer 26

``` Has a charge and mass of 0 Same thing as x rays Travel at the speed of light Dangerous- high pp Stopped by several ft. Of concrete lead ```

Question 27

Half life

Answer 27

Is the time it takes for 1/2 of a sample to decompose

Question 28

Fission

Answer 28

Breaking apart of very heavy nucleus in to parts

Question 29

Fusion

Answer 29

Merging of 2 nuclei at high temperatures like sun