Chapter 3 Review

Question 1

Can atoms be divided?

Accepted Answer

True

Question 2

Atomic Number is __________.

Accepted Answer

the number of protons in the nucleus

Question 3

What did J.J. Thomson discover?

Accepted Answer

the electron

Question 4

identify this element

Accepted Answer

Aluminum (atomic # = 13)

Question 5

What is the charge of a proton?

Accepted Answer

Positive (+1)

Question 6

_________ found that cathode ray has particles with mass and negative charge (electrons).

Accepted Answer

JJ Thomson

Question 7

How many atoms are in one mole?

Accepted Answer

6.022x1023 atoms

Question 8

What are the outer electrons called?

Accepted Answer

Valence electron

Question 9

What is the charge of an electron?

Accepted Answer

Negative (-1)

Question 10

Who first thought of the concept of an atom?

Accepted Answer

Democritus

Question 11

How many neutrons in an atom with this nuclear symbol?

Accepted Answer

143

Question 12

What are the the three subatomic particles?

Accepted Answer

protons, neutrons, and electrons

Question 13

H2 and O2 react to form H2O. ___g water would form if 14.8 g of H2 reacts with 34.8 g of O2.

Accepted Answer

49.6

Question 14

How many neutrons does argon have if it has a Mass number of 40 and an Atomic number of 18?

Accepted Answer

22

Question 15

How many electrons are in Argon-40?

Accepted Answer

18

Question 16

How many electrons can the first electron shell hold?

Accepted Answer

2

Question 17

What is the molar mass of MgF2?

Accepted Answer

62 g/mol

Question 18

What is Molar Mass

Accepted Answer

The mass of one mole of a substance

Question 19

What is the charge of a neutron?

Accepted Answer

Neutral (0)

Question 20

How many protons does this element have?

Accepted Answer

17

Question 21

You have 88 grams of potassium. What is the mole of the potassium?

Accepted Answer

2.25 mols K

Question 22

What particles are inside the nucleus of an atom?

Accepted Answer

Protons & Neutrons

Question 23

This is the _________________.

Accepted Answer

Law of Multiple Proportions

Question 24

What is the correct conversion factor for converting from atoms of copper to moles of copper

Accepted Answer

I mole Cu / 6.02 x 1023 atoms Cu, 6.02 x 1023 atoms Cu / 1mole Cu

Question 25

What does the law of conservation of mass state?

Accepted Answer

Matter is neither created nor destroyed

Question 26

How many protons in an atom with this nuclear symbol?

Accepted Answer

92

Question 27

This is the ______________.

Accepted Answer

Law of Definite Proportions

Question 28

Write this atom in hyphen notation

Accepted Answer

Boron - 11

Question 29

Who's model of the ATOM is this?

Accepted Answer

JJ Thomson (Plum Pudding Model)

Question 30

3 mole of C is how many grams?

Accepted Answer

36 g C

Question 31

What is the center of the atom called?

Accepted Answer

nucleus

Question 32

John Dalton developed...

Accepted Answer

Dalton's atomic theory

Question 33

What subatomic particle tells the identity of an atom?

Accepted Answer

Proton

Question 34

What was Rutherford's experiment called?

Accepted Answer

Gold Foil Experiment

Question 35

What did Rutherford discover?

Accepted Answer

positively charged nucleus + mostly empty space electron cloud

Question 36

The 2nd electron shell can hold how many electrons

Accepted Answer

8

Question 37

Perform the following conversion: 1.51 x 1015 atoms of Si to mol of Si

Accepted Answer

2.51 x 10-9 mols Si

Question 38

what is a mass number?

Accepted Answer

the total number of protons and neutrons in a nucleus

Question 39

What is an isotope?

Accepted Answer

Atoms with the same # of protons and electrons but different # of neutrons., Atoms having the same atomic number but different mass numbers.

Question 40

Which scientist does this MODEL belong to?

Accepted Answer

Rutherford

Chapter 3 Review

Questions 40

Chapter 3 Review

Questions 40