Winter Exam Review (III) - G

Chemical Bonding

100

In an ionic bond, electrons are _______ while in a covalent bond, electrons are _______.

transferred; shared

200

If oxygen has a electronegativity of 3.5, which element would we most expect it to form an IONIC bond with?

F, EN = 4.0
C, EN = 2.5
H, EN = 2.1
Ca, EN = 1.0

Ca, EN = 1.0.
Reasons: ∆EN = 3.5-1.0 = 3.5 > 1.5. Also calcium is the only metal on the list and ionic bonds tend to form between metals and nonmetals

300

Which of the following compounds is a covalent compound?

lithium nitride
iron(II) oxide
ammonium nitrate
hydrogen sulfide

hydrogen sulfide. hydrogen and sulfur are both nonmetals. 

400

Give the name of the compound Ti(SO₄)₂

Titanium(IV) sulfate 

500

Explain why the empirical formula and the chemical formula of an ionic compound is generally the same, but the empirical formula and chemical formula of a molecular compound are often not the same. 

The formula for an ionic compound is the simplest mole ratio = the same as the empirical formula because ionic compound exist as ionic lattices.

The formula for a molecule is the actual number of each atom in the molecule; therefore its formula will not necessary be the simplest mole ratio (empirical formula) 

Classifying Matter

100

A compound can only be ________ separated, not _______ separated. 

chemically; physically

200

Which of the following is NOT a homogeneous mixture?

Mud
Apple Juice
Hydrochloric Acid
Brass

Mud–it's a heterogeneous mixture

300

A scientist separates an unknown substance into two components using filtration. Is the substance a heterogeneous or a homogeneous mixture?

Heterogeneous

400

The Law of Constant Composition applies only to

Pure substances (compounds and elements)

500

All baking soda is the same, but there are many different variants of baking powder. This tells us that baking soda must be a _______ while baking powder must be a _______. 

pure substance/compound; mixture. 

the Periodic Table and Electron Configuration

100

What is the name of the family of elements with fully filled s and p sublevels? 

Noble gases

200

What is the identity of the neutral element with ground state electron configuration 1s²2s²2p⁶3s²3p²

Silicon

300

Calculate the effective nuclear charge (Zeff) of silicon, Z=14. 

+4 

400

If a neutral atom has the excited state configuration 2s¹3s²4s¹ it must be an atom of which element. 

Beryllium, Be

500

Which particle has the larger radius: Ne,  Mg⁺², or O^-2? 

O^-2

Mole Conversions and Dimensional Analysis

100

How many miligrams are contained in 0.005kg? 

5000mg

200

How many atoms of gold are contained in 0.20 moles of gold?

1.2*10²³ atoms of gold

300

What is the theoretical yield of a reaction that actually produced 5.00g of product and had a percent yield of 93.6%?

5.34g 

400

Write the set up to solve for the molarity of a solution of substance A if substance A has a molar mass of X g/mol and Y g of substance A is dissolved to make Z mL of solution. 

Y g * (mol)/(X g) *1/(Z mL) * (1000mL)/(L

500

Solve for the empirical formula of a compound that is 74.9% Fe and 30.1% O. 

Fe₂O₃