SI CHEM1210 Final

Chapters 1-2: Atomic Structure and Formula Calculations

100

What is the speed of light in nm/ms ?

Speed of light = 3.0x10⁸ m/s

3.0x10¹⁴ nm/ms

200

The formula for sodium dihydrogen phosphate is NaH₂PO₄

What is the formula of strontium dihydrogen phosphate?

Sr(H₂PO₄)₂

300

The is the percent of oxygen in phosphoric acid?

65.3%

400

What is the empirical formula of a compound of carbon, hydrogen, and oxygen that contains 51.56% carbon and 14.09% hydrogen by mass?

C₄H₁₃O₂

500

For each compound, classify as ionic, covalent, or an acid. Name the compound

a. CCl₄

b. H₂PO₄

c. K₃P

d. HgBr₂

e. H₂S

a. covalent, carbon tetrachloride

b. acid, phosphoric acid

c. ionic, potassium phosphide

d. mercury (II) bromide

e. (binary) acid, hydrosulfuric acid

Chapters 3-4: Stoichiometry and Solutions

100

What is the molarity of a solution prepared by dissolving 12.0 g NaCl in 300.0 mL water?

0.683 M

200

Which molecular equation would give this net ionic equation: H⁺(aq) + OH^-(aq) --> H₂O(l)

a. H₂SO₄(aq) + 2NH₃(aq) --> (NH₄)₂SO₄(aq)

b. HCN(aq) + KOH --> H₂O(l) + KCN(aq)

c. 2HClO₄(aq) + Ba(OH)₂(aq) --> 2H₂O(l) + Ba(ClO₄)₂(aq)

c. 2HClO₄(aq) + Ba(OH)₂(aq) --> 2H₂O(l) + Ba(ClO₄)₂(aq)

300

A 2.32 g sample of Na₂SO₄*nH₂O yields 1.42 g Na₂SO₄ upon heating.

Na₂SO₄*nH₂O --> Na₂SO₄ + nH₂O

What is the value of n?

n=5

400

How many grams of NaOH are required to neutralize 50.0 mL of 0.100 M H₂SO₄?

0.4 g NaOH

H₂SO₄ + 2NaOH --> Na₂SO₄ + 2H₂O

500

Adipic acid, C₆H₁₀O₄ (MM=146.15), is prepared by the partial oxidation of cyclohexane, C₆H₁₂ (MM = 84.16), according to the following balanced equation:

2C₆H₁₂(l) + 5O₂(g) --> 2C₆H₁₀O₄(s) + 2H₂O(l)

A sample of 25.0 g cyclohexane reacts with excess oxygen to give 33.5 g of adipic acid. What is the yield of the reaction?

77.2%

Chapters 5-6: Thermochemistry and Electronic Structure

100

How much heat (in J) is required to raise 75.0 g of water from 25 C to 55 C? (c=4.184 J/gC)

q = m*c*deltaT

9,414 J

200

Use the enthalpies of formation (given on board) to determine deltaH for this reaction:

2C₂H₂(g) + 5O₂ --> 4CO₂(g) + 2H₂O(g)

-2510 kJ/mol

300

What is the frequency of light with a wavelength of 480 nm?

a. 1.60x10^-6 s^-1

b. 6.25x10⁵ s^-1

c. 6.25x10¹⁴ s^-1

d. 1.44x10²⁰ s^-1

c. 6.25x10¹⁴ s^-1

400

Which atom has the largest atomic radius?

a. K

b. Rb

c. I

d. Sn

Rb

500

Given the thermochemical data (on board) what is the deltaH_rxn for:

CO(g) + 1/2O₂(g) --> CO₂(g)

-284 kJ/mol

Chapters 7-8: Structure and Bonding

100

What is the molecular geometry of CO₃^2-?

a. bent

b. T-shaped

c. trigonal bipyramidal

d. trigonal planar

d. trigonal planar

200

How many lone pairs of electrons are on the central atom of ClF₃?

2 lone pairs

300

Which species contains three sigma bonds and one pi bond?

a. PF₃

b. NH₄⁺

c. CO₃^2-

c. CO₃^2-

400

Which of the molecules listed have an sp³ hybridized central atom?

I. PCl₃ II. COCl₂ III. SF₄

a. I only

b. I and III only

c. II and III only

d. I, II, and III

a. I only (PCl₃)

500

Which species has a trigonal planar geometry?

a. ClF₃

b. NCl₃

c. CO₃^-2

d. I₃^-1

c. CO₃^-2

Chapters 9-10: States of Matter

100

A 10.0 L sample of an ideal gas at 25.0 C is heated at a constant pressure until the volume has doubled. What is the final temperature of the gas?

323 C

200

A 14.0 g sample of N₂(g) occupies what volume at 0 C and 1.00 atm?

a. 5.60 L

b. 11.2 L

c. 14.0 L

d. 22.4 L

b. 11.2 L

300

What volume (in L) of CO₂(g), measured at 0.993 atm and 28 C, must react in order to completely consume 59.0 g of Al₂O₃(s)?

Al₂O₃(s) + 3CO₂(g) --> Al₂(CO₃)₃(s)

MM of Al₂O₃ = 101.96 g/mol

43.3 L

400

Which pair of compounds will form hydrogen bonds with one another?

a. CH₄ and H₂O

b. CH₄ and NH₃

c. HF and CH₄

d. H₂O and NH₃

d. H₂O and NH₃

500

Arrange LiF, HCl, HF, and F₂ in order of increasing boiling point.

a. F₂ < HF < HCl < LiF

b. F₂ < HCl < HF < LiF

c. F₂ < HCl < LiF < HF

d. HF < LiF < HCl < F₂

b. F₂ < HCl < HF < LiF