Chemistry CFA 2

Chemistry CFA 2 Review
By Aiden Lockhart

Important Note

​This is a review, not an exact replica of the quiz!

I have tried my best to formulate this review to go over anything new in CFA 2. I created this based off of Ms. Fontanilla's post on the new content of CFA 2. I also have taken into account feedback from previous quizzes to make this one better.
(If anything is incorrect email me: [e-mail]

Multiple Choice

Who was the first person out of the following to create the concept of an atom?

• Democritus

• Thomson

• Niels Bohr

• Chadwick

Here is a timeline by Ms. Fontanilla of the models of the atom over time.
It is important that you remember the gist of this image.

​

ATOMIC TIMELINE!
(Cool name right?)

Multiple Choice

Who determined that most of an atom is empty space?

• Democritus

• Rutherford

• Dalton

• Chadwick

Multiple Select

What do the groups on the periodic table represent?

(Multiple answers)

• The Family Groups

• Reactivity

• Amount of energy

• Amount of Valence Electrons

Multiple Choice

If the group number is 18 how many valence electrons are there?

• 18

• 9

• 8

• 7

Multiple Choice

Who found neutrons?

• Democritus

• Thomson

• Neutreolus

• Chadwick

Multiple Choice

Who created the "plum pudding model"?

• Bhor

• Chadwick

• Thomson

• Rutherford

Multiple Choice

Describe electrons?

• Small, Negatively charged, In the nucleus

• Large, Positively charged, In the nucleus.

• Large, No charge, In the Nucleus.

• Small, Negative charge, Outside the Nucleus.

Multiple Choice

Describe neutrons.

• Small, Negatively charged, In the nucleus

• Large, Positively charged, In the nucleus.

• Large, No charge, In the Nucleus.

• Small, Negative charge, Outside the Nucleus.

Multiple Choice

Describe protons.

• Small, Negatively charged, In the nucleus

• Large, Positively charged, In the nucleus.

• Large, No charge, In the Nucleus.

• Small, Negative charge, Outside the Nucleus.

Isotopes

Isotopes are atoms with a different amount of neutrons than the norm. For example, a hydrogen atom with three neutrons.
They are also shown in different ways.
Like the examples in this image.

Multiple Choice

What are valence electrons?

• Electrons that don't move.

• Electrons closer to the nucleus.

• Electrons on the outer ring.

• Electrons with a high velocity.

Multiple Choice

An element has the following natural abundances and isotopic masses: 90.92% abundance with 19.99 amu, 0.26% abundance with 20.99 amu, and 8.82% abundance with 21.99 amu. Calculate the average atomic mass of this element.

• 20.16 amu

• 20.18 amu

• 100.29 amu

• 64.78 amu

Multiple Choice

Average atomic masses listed by IUPAC are based on a study of experimental results. Bromine has two isotopes, ⁷⁹Br and ⁸¹Br, whose masses (78.9183 and 80.9163 amu) and abundances (50.69% and 49.31%) were determined in earlier experiments. Calculate the average atomic mass of Br based on these experiments.

• 49.98

• 83.90

• 79.90

• 60.46

Multiple Choice

How many valence electrons does helium have?

• 3

• 4

• 2

• 1

Multiple Choice

How many electrons are in the 4th ring of an atom?

• 4

• 8

• 16

• 18

Multiple Choice

How many electrons are in the first ring of an atom?

• 2

• 6

• 8

• 12

Facts about Electrons

Valence electrons determine the reactivity of an element, they also are found on the outer shell of an atom which helps them transfer to other atoms. Electrons also have a negative charge, are very small, and very fast.

Multiple Choice

What is on the outside of the Lewis Dot structure?

• Protons

• Neutrons

• Electrons

• Valence Electrons

Lewis Dot structure.

​https://www.youtube.com/watch?v=6dRdMy9tgzE

Link for how to do orbital diagrams.

Draw

Draw the Lewis dot structure of hydrogen.

Multiple Choice

How many valence electrons are in the following sequence?

[1s² 2s² 2p⁶ 3s² 3p⁴]

• 4

• 3

• 6

• 7

Multiple Choice

How many valence electrons are in the following sequence?

[1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁸]

• 12

• 6

• 2

• 8

Multiple Choice

I have 11 neutrons, a mass of 24, have a charge of +1, how many electrons do I have.

• 10

• 11

• 12

• 13

Multiple Choice

I am a noble gas with only 1 electron and have a charge of -1, who am I?

• Hydrogen

• Helium

• Berilium

• Neon

Multiple Choice

I am very reactive and i am in the second row, who am I?

• Hydrogen

• Lithium

• Carbon

• Sulfur

• Arsenic

Multiple Choice

True of False: Mixtures can be made out of mixtures of atoms.

• True

• False

Multiple Select

Which of the following are elements?

• Hydrogen

• Carbon Dioxide

• Americium

• Tennessine

Thanks For Playing!