Exam 2 CHEM1311-04P

Chemical Nomenclature

100

Write the chemical formula for:

silicon disulfide

SiS₂

200

Write the chemical formula, and designate charges to individual ions:

Sulfurous Acid

H₂SO₃

H¹⁺

SO₃^2-

300

Write the chemical formula, and designate charges to individual ions:

Bromic Acid

HBrO₃

H¹⁺

BrO₃^1-

400

Write the chemical formula, and designate charges to individual ions:

gallium (III) acetate

Ga(CH₃COO)₃ 

Ga³⁺

CH₃CHOO^1-

500

Write the correct chemical formula with correct charges for:

Sulfide vs. Sulfite vs. Sulfate

Nitride vs. Nitrite vs. Nitrate

Ammonia vs. Ammonium

S^2-, SO₃^2-, SO₄^-2

N^3-, NO₂^1-, NO₃^1-

NH₃^1-, NH₄¹⁺

Reaction Types + Solubility +Net Ionic Equations

100

This reaction type occurs when two or more reactants combine to form a single product, such as the reaction of hydrogen and oxygen to form water.

What is a synthesis reaction?

200

Which ion is commonly found in soluble salts of alkali metals, making most of their compounds soluble in water?

What is the sodium ion (Na⁺)?

300

What type of reaction occurs when an acid reacts with a base to produce water and a salt?

What is a neutralization reaction?

400

In a single displacement reaction, if zinc (Zn) displaces copper (Cu) from copper(II) sulfate (CuSO₄), what is the balanced chemical equation for this reaction?

What is Zn (s) + CuSO₄ (aq) → Cu (s) + ZnSO₄ (aq)?

500

In a double displacement reaction, if sodium sulfate (Na₂SO₄) reacts with barium chloride (BaCl₂), what is the net ionic equation for the reaction?

What is Ba²⁺ (aq) + SO₄²⁻ (aq) → BaSO₄ (s)?

Stoichiometry

100

This constant represents the number of particles, such as atoms or molecules, in one mole of a substance.

What is Avogadro’s number?

200

This term refers to the ratio of the actual yield to the theoretical yield, expressed as a percentage. 

What is percent yield? 

300

When calculating the mass of a product formed from a chemical reaction, the reactant that determines the amount of product is called this

What is the limiting reactant

400

How many moles of carbon dioxide (CO₂) are produced when 88.0 grams of propane (C₃H₈) are burned completely in excess oxygen?

What is 6.00 moles of CO₂?

500

If 5.00 grams of hydrogen gas (H₂) reacts with excess oxygen gas (O₂) to form water (H₂O), how many grams of water are produced?

What is 45.0 grams?

Mole Conversions

100

What is the molar mass of hydrochloric acid (HCL)?

36.46 g/mol

200

What is the molar mass of (Mg₃Si₂H₃O₈)₂?

520.2100 g/mol

300

How many moles in 4.4 grams of Sodium Chloride (NaCl)?

about 0.08 moles NaCl

400

How many Kilograms in 9.01 x 10²² molecules of Sulfate?

about .014 kilograms of SO₄

500

What is the mass in grams of 5 Molecules of ammonium (NH₄).

about 1.09 x 10²⁵ grams

% Abundance +Empirical and Molecular Formulas

100

This term refers to the simplest whole-number ratio of atoms in a compound

What is the empirical formula?

200

The empirical formula of a compound is NH₂. If the molar mass of the compound is 32 g/mol, what is the molecular formula?

What is N₂H₄?

300

An element exists as two isotopes: one isotope has a mass of 10.0 amu and a percent abundance of 20.0%, and the other has a mass of 11.0 amu with 80.0% abundance. What is the average atomic mass of the element?

What is 10.8 amu?

400

The molar mass of a compound is 180.18 g/mol, and its empirical formula is CH₂O. What is the molecular formula of the compound?

What is C₆H₁₂O₆?

500

A compound is found to have the following percent composition by mass: 40.00% carbon, 6.72% hydrogen, and 53.28% oxygen. What is the empirical formula of the compound?

What is CH₂O?