Chemistry Atomic Theory

Question 1

What did democritus believe?

Answer 1

matter isn’t infinitely divisible, it is made up of tiny particles called atoms, atoms can’t be created, destroyed, or further divided

Question 2

What couldn’t democritus answer?

Answer 2

what holds atoms together?

Question 3

Dalton’s beliefs

Answer 3

properties are the same of atoms of a given element, atoms of different elements differ, atoms combine in different ratios to form compounds, chemical reactions involve atoms separating, combining, rearranging themselves

Question 4

What were Dalton’s experiments?

Answer 4

chemical reactions, studied mass ratios of elements involved in those reactions

Question 5

What was Dalton wrong about

Answer 5

atoms being indivisible and atoms of the same element having the same masses

Question 6

who worked with the cathode ray

Answer 6

Sir William Crookes

Question 7

What did JJ Thomson first discover?

Answer 7

electron

Question 8

What did Thomson do to discover the electron?

Answer 8

measure the effects of a mag and electric field on a cathode ray particle to determine it’s charge to mass ratio

Question 9

Milikan?

Answer 9

oil drop experiment, charge of electron, mass of electron

Question 10

JJ Thomson Plum Pudding Model

Answer 10

all matter is neutral, how do electrons exist? the model shows this

Question 11

Rutherford foil experiment?

Answer 11

a narrow beam of alpha particles aimed at a thin sheet of gold foil

Question 12

Rutherford expectations?

Answer 12

most alpha particles would pass through gold foil, but some deflected at large angles and some deflected right back to the source, leading to the conclusion of the positively charged nucleus and empty space in the atom

Question 13

Rutherford’s flaw?

Answer 13

model doesn’t account for all of the atom’s mass

Question 14

Who proved protons

Answer 14

Rutherford

Question 15

Who proved neutrons

Answer 15

Chadwick

Question 16

Bohr model incorrect?

Answer 16

electrons do not move around the nucleus in circular orbits, didn’t explain emission spectrum of other elements

Question 17

Debroglie

Answer 17

particles behave like waves, particle wave equation

Question 18

Heisenburg Uncertainty Principle

Answer 18

can’t know position and velocity of particle at the same time

Question 19

what does the atomic orbital describe?

Answer 19

the electron’s probable location

Question 20

Schrodinger wave equation

Answer 20

treated Hydrogen electron as a wave

Question 21

Planck

Answer 21

energy was quantized

Question 22

photoelectric effect

Answer 22

a photon’s energy depends on its frequency

Question 23

Single replacement?

Answer 23

more reactive replaces less reactive

Question 24

What is produced in double replacement

Answer 24

water, a precipitate, or a gas

Question 25

blow up, explosion, heat necessary in many ocassions

Answer 25

Combustion

Question 26

break down, light, energy, heat necessary in many ocassions

Answer 26

Decomposition

Question 27

relative mass of electron

Answer 27

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