Intro to Chemistry & Intro to Chemical Bonds Review

Multiple Choice

What's a valence electron?

• electrons in the second energy level
• electrons in the outermost energy level
• the atomic number
• electrons in the first level

Multiple Choice

How many valence electrons are shown in the diagram?

• 16

• 7

• 6

• 2

Multiple Choice

This image shows the bonding between Lithium and Fluorine. What does the red arrow show?

• electrons being shared

• electrons being transferred to Fluorine

• electrons being transferred to Lithium

• electrons being destroyed

Multiple Choice

An ionic bond forms when 

• Valence electrons are shared
• a sea of mobile electrons surround the cations
• valence electrons are transferred between atoms
• none of the above

Multiple Choice

How many pairs of valence electrons are being shared in a single ammonia molecule?

• 0 pair - 0 valence electrons

• 1 pair - 2 valence electrons

• 2 pair - 4 valence electrons

• 3 pair - 6 valence electrons

Multiple Choice

Atoms gain lose, gain, or ______electrons to get a stable outer energy level.

• share
• split
• create
• destroy

Multiple Choice

What type of bonding does this picture show?

• Ionic

• Covalent

Multiple Choice

In this image, the symbol to the right of the arrow (in black) are called _______.

• Products

• Reactants

• Subscripts

• Coefficients

Open Ended

The chemical formula for an antacid is CaC0_3.

_{How many total atoms are in the formula for antacids?}

Multiple Choice

How many atoms of Hydrogen are in H₂O

• 1

• 2

• 3

• more than 3

Multiple Choice

Calculate the number of Oxygen atoms in Al(OH)₃

• 1

• 2

• 3

• 4

Multiple Choice

The ______ are numbers found on the lower right-hand side of an element symbol.

• Coefficient

• Exponent

• Multiplier

• Subscript

Multiple Choice

Coefficients in chemical formulas...

• Multiply just the first atom

• Add to the subscripts at the end of the molecule

• Multiply elements without subscripts

• Multiply EVERYTHING!

Multiple Choice

4CF₂Cl₂

• C = 4, F = 4, Cl = 2

• C = 1, F = 8, Cl = 8

• C = 4, F = 8, Cl = 8

• C = 1, F = 4, Cl = 8

Multiple Choice

H₂SO₄

• H = 2, S = 4, O = 4

• H = 2, S = 1, O = 4

• H = 8, S = 4, O = 4

• H = 2, SO = 4

Poll

How confident do you feel about this topic now?

• Very confident
• Somewhat confident
• Not confident