Chem Ch4 test

Question 1

Who was the very first person to refer to matter as being made of particles?

Answer 1

Democritus

Question 2

What law describes how any sample of water contains 8 g of oxygen for every 1 g of hydrogen?

Answer 2

Law of Definite Composition

Question 3

Whose model was the first to include the different masses of different elements?

Answer 3

Dalton’s atomic model

Question 4

What were the rays of Thomson that he used in his experiment?

Answer 4

Cathode rays

Question 5

An atom has three types of subatomic particles. What are they?

Answer 5

Protons, neutrons, electrons

Question 6

Which of the following subatomic particles has the least mass?

Answer 6

Electrons

Question 7

This guy created a new atomic model because of discoveries made during an alpha particle experiment?

Answer 7

Rutherford

Question 8

Who is credited with the discovery of the neutron?

Answer 8

James Chadwick

Question 9

Who first identified and named the positively charged particle

Answer 9

Rutherford

Question 10

Whose work helped to explain line spectra?

Answer 10

Bohr

Question 11

Who conducted the experiment in which alpha particles were deflected by gold foil?

Answer 11

Rutherford

Question 12

The abbreviation Z represents the number of __________ in an atom.

Answer 12

Protons

Question 13

Because energy levels are ___________, energy emissions come in certain quantities

Answer 13

Quantized

Question 14

Niels Bohr proposed the concept of principal energy levels that he envisioned as a set of circular tracks on which ___________ orbited.

Answer 14

Electrons

Question 15

The __________ states that it is impossible to know both the energy and the exact position of an electron at the same time.

Answer 15

Uncertainty principle

Question 16

Louis de Broglie proposed the _________ nature of electrons

Answer 16

Dual; wave particle

Question 17

This is also known as the “Fingerprint of light” What is it called?

Answer 17

Spectrum

Question 18

If two or more protons come together in a nucleus and there is nothing else in the nucleus, what would the protons do?

Answer 18

They would repel from each otherbc same charge

Question 19

If two or more neutrons come together in a nucleus and there is nothing else in the nucleus, what would the neutrons do?

Answer 19

They just float around bc there are not protons to keep the together

Question 20

Why do neutrons exist?

Answer 20

To stabilize the nucleus of an atom

Question 21

The atomic number tells us what about the atom?

Answer 21

How many protons (Z), identity of atom

Question 22

You have a Hydrogen atom. It has level 1 sublevel s. The level 1 sublevel s can be occupied by no more than ____ electrons

Answer 22

2

Question 23

How are the first four sublevels called and what is the maximum number of electrons that can be in each kind sublevel?

Answer 23

S, P, D, F
S- 2
P- 6
D- 10
F- 14

Question 24

Which is largest in size, 4p, 2p or 3p?

Answer 24

4p

Question 25

Electrons cannot have the same address in the atom. Is this true or false and who said it?

Answer 25

True, Pauli (Exclusion Principle)

Question 26

Which of the following is part of the electron’s address location in an atom?

Answer 26

N- energy level (1, 2, 3, 4 distance from nucleus) L- energy orbital or sublevel (s, p, d, f) M- how sublevel or orbital is arranged in 3D space S- Spin (electron spin)

Question 27

An electron has to occupy the _____________ available energy level

Answer 27

lowest (Aufbau principle)

Question 28

The element sulfur (16 electrons) has an electron configuration of

Answer 28

1s2 2s2 2p6 3s2 3p4

Question 29

Examine the following orbital notation: 5p6 What does the superscript 6 refer to?

Answer 29

How many electrons there are

Question 30

Examine the following orbital notation: 6f 6 What does the letter f refer to?

Answer 30

The sublevel/orbital

Question 31

Why does the 4s orbital fill up with electrons before 3d?

Answer 31

4s is the level below 3d

Question 32

Bromine (Atomic number = 35) exists naturally as a mixture of bromine-79 and bromine-81 isotopes. An atom of bromine-79 contains

Answer 32

44 neutrons

Question 33

The 78 in the isotope of Krypton is made up of 78 K 36

Answer 33

Protons and Neutrons

Question 34

The 36 in the isotope of Krypton is made up of 78 K 36

Answer 34

Protons

Question 35

How many protons are in this Calcium? 40 C 20

Answer 35

20

Question 36

Do isotopes of Carbon have the same number of protons?

Answer 36

Yes

Question 37

In the electron dot diagrams, what do the dots around the element’s symbol represent?

Answer 37

Valance electrons

Question 38

The minimum number of electrons that surround an atom in an electron dot diagram is:

Answer 38

1

Question 39

The maximum number of electrons that surround an atom in an electron dot diagram is

Answer 39

8

Question 40

Oxygen-13, Oxygen-14, Oxygen-15 and Oxygen 16 all have the same thing. The one thing they all have is_________.

Answer 40

8 protons

Question 41

Carbon-12 and Carbon-14 have the same number of _________ but a different number of

Answer 41

Protons, neutrons

Question 42

Electrons will fill a sub level after an electron is already there and it will spin in the __________ direction

Answer 42

Opposite (Hund’s rule)