2ND SEMESTER CHEMISTRY FINAL - Winkeler

Second semster chemistry final for all sophomore classes. Some questions require math, so do them and choose the right answer.

What does aq mean

aqueous

What does aqueous mean

soluble in water

What are the units for molar mass

g/mol

What do brackets mean

Concentration (Molarity)

What are the types of reactions (5 problems)

• Combination (Synthesis) • Decomposition • Combustion • Single Displacement • Double Displacement

What is the precipitate

Insoluble solid from chemical reaction

What is a precipitation reaction

Two solutions mixed together create a solid

Given two solutions (XY and XY) with the first one being X+1 and Y−2 and the second being X+2 and Y−1, what would the formulas be

X₂Y and XY₂

Complete this reaction: BaF₂ + K₂SO₄ →

BaSO₄ + KF

What’s the precipitate of this reaction BaF₂ + K₂SO₄ → BaSO₄ + KF

BaSO₄ (s)

What is the net ionic equation of this reaction BaF₂ + K₂SO₄ → BaSO₄ + KF

Ba²⁺ + SO₄²⁻ → BaSO₄ (s)

What are the spectator ions in this reaction BaF₂ + K₂SO₄ → BaSO₄ + KF

F⁻ and K⁺

Complete this reaction: I₂ + GaBr₃ →

GaI₃ + Br₂

Complete this reaction: Ba + H₃PO₄ →

Ba₃(PO₄)₂ + H₂

What is oxidation

Loss of electrons

What is reducing

Gaining of electrons

What is an oxidizing agent

Element or compound that is reducing

What is a reducing agent

Element or compound that is oxidizing

What is the oxidation number of P in Ca₃(PO₄)₂

+5

What is the oxidation number of Cr in Cr₂O₇²⁻

+6

Is Br being oxidized or reduced & is it the oxidizing or reducing agent in BrO₄⁻ → Br₂

Reduced and oxidizing agent

What is the name of HI

Hydroiodic acid

What is the name of NH₃

Ammonia (base)

What is the name of H₂SO₄

Sulfuric acid

Is CH₃COOH an acid or a base

Acid

Is Ca(OH)₂ an acid or a base

Base

What are the properties of an acid

tastes sour, produces H⁺ ions, turns blue litmus red, reacts with metals, pH < 7, corrosive, conducts electricity

What are the properties of a base

tastes bitter, feels slippery, produces OH⁻ ions, turns red litmus blue, pH > 7, corrosive, conducts electricity

[H₃O⁺]↑:

Acidic

[OH⁻]↑:

Basic

What do double arrows (⇌) mean

Equilibrium

What does equilibrium mean

Reactants and products present

Is an equilibrium reaction weak or strong

Weak

Does an equilibrium reaction dissociate fully

No, partial dissociation

What is the constant for pH and pOH problems

1 × 10⁻¹⁴

[H₃O⁺] = 1.62 × 10⁻¹² M → [OH⁻] =

6.17 × 10⁻³

[OH⁻] = 3.59 × 10⁻² M → [H₃O⁺] =

2.73 × 10⁻¹³

pH = 6.42 → pOH =

7.58

[H₃O⁺] = 5.58 × 10⁻⁵ M → pOH =

9.75

What is titration

method to find unknown concentration

What is a limiting reactant

reactant used up first

What gas law is PV = nRT

Ideal Gas Law

What does n stand for in PV = nRT

moles

Convert 5.16 atm to mmHg

3921.6 mmHg

Convert 1250 mmHg to atm

1.64 atm

What does directly proportional mean

both increase at constant ratio

What does inversely proportional mean

one increases while the other decreases

What is the value for R in PV = nRT

0.0821

What is the dilution formula

M₁V₁ = M₂V₂

What is the molarity formula

M = mol/L

What is STP

273 K and 1 atm

What is the conjugate of SO₄²⁻

HSO₄⁻

What is the conjugate of CH₃COOH

CH₃COO⁻

What is the conjugate of OH⁻

H₂O

What is the conjugate of NH₄⁺

NH₃

What is the conjugate of PO₄³⁻

HPO₄²⁻

What is the conjugate of NH₂⁻

NH₂⁻ (typo in teacher content but keep as given)

Make this base an acid: MoO₄²⁻ →

H₂MoO₄

Complete this reaction: H₂MoO₄ + NH₃ →

HMoO₄⁻ + NH₄⁺

What is the volume of one mole of gas at STP

22.423 L

How many grams of aluminum dichromate are required to create 425.15 g of a 3.55 M solution

1059.7 g

A sample of oxygen gas has a volume of 4.50 L at 95.0 kPa. Pressure increases to 125 kPa at constant temperature. Which gas law applies

Boyle’s Law

A balloon contains 2.10 L of helium at 18°C. It is warmed to 48°C at constant pressure. Which gas law applies

Charles’ Law

How many mL of 14.1 M HNO₃ are required to make 1.50 L of 2.50 M solution

266.0 mL

Complete the reaction (include phases): Sr(OH)₂ + FeCl₃ →

SrCl₂ (aq) + Fe(OH)₃ (s)

Net ionic equation for Sr(OH)₂ + FeCl₃ → SrCl₂ (aq) + Fe(OH)₃ (s):

Fe³⁺ (aq) + 3 OH⁻ (aq) → Fe(OH)₃ (s)