Comprehensive Makeup Exam

Question 1

Solids have a ____ shape and are not appreciably _______.

Answer 1

definite; compressible

Question 2

If matter is uniform throughout, cannot be separated into other substances by physical processes, but can be decomposed into other substances by chemical process, it is called a(n) _______.

Answer 2

compound.

compound can only be separated by chemical process.
homogeneous mixture is easier to separate

Question 3

A separation process that depends on differing abilities of substances to form gases is called _______.

Answer 3

distilation

Question 4

The SI unit for mass is _______.

Answer 4

kilogram

Question 5

Formula for density?

Answer 5

d= m/v

Question 6

Elements in Group 6A are called?

Answer 6

chalcogens

Question 7

Elements in Group 7A are called?

Answer 7

halogens

Question 8

The formula of a salt is XCl₂. The X-ion in this salt has 28 electrons. The metal X is _____

Answer 8

Zn

Cl has a charge of -1 (times 2 for Cl₂) = -2
So X must have a +2 charge
Add 2 protons (aka atomic #)

Question 9

The formula of ammonium carbonate is ________

Answer 9

(NH₄)₂CO₃

Question 10

Molecular formula of heptane?

Answer 10

C₇H₁₆

Question 11

What is the molecular formula for n-hexanol?

a) C₆H₁₂OH
b) C₆H₁₃OH
c) C₆H₁₄OH
d) C₇H₁₃OH
e) C₇H₁₄OH

Answer 11

C₆H₁₃OH

Question 12

Convert 9.316 x 10⁻⁷m to nm

Answer 12

932 nm

Question 13

What is the formula for wavelength?

Answer 13

c=λf

Question 14

What is the speed of light? What is its variable?

Answer 14

c= 3x10⁸ m/s

Question 15

What is the formula for energy?

Answer 15

E=hv

Question 16

What is planck’s constant?

Answer 16

h= 6.626 x 10⁻³⁴

Question 17

The wavelength of a photon that has an energy of 5.25 x 10⁻¹⁹J is ________ m

Answer 17

3.79 x 10⁻⁷

Question 18

How many p-orbitals are occupied in a Ne atom?

Answer 18

3 p-orbitals – 1s²2s²2p⁶ – one p-subshell (3 orbitals per -subshell)

Question 19

Each p-subshell has ___ p-orbitals

Answer 19

3

Question 20

Each p-subshell can accommodate a maximum of ______ electrons

Answer 20

6

The p-subshell has 3 p-orbitals, each of which holds a maximum of 2 electrons, giving a maximum of 6 electrons per p-subshell.

Question 21

Each s-subshell can accommodate a maximum of _____ electrons

Answer 21

2

Question 22

Each d-subshell can accommodate a maximum of _____ electrons

Answer 22

10

Question 23

Each d-subshell has ___ orbitals

Answer 23

5

Question 24

The electron configuration of a ground-state Ag atom is ________

Answer 24

Ag and Cu are an exceptions.

[Kr] 5s¹4d¹⁰

Kr = 36
Ag = 47

Question 25

What is the electron configuration for Se?

Answer 25

[Ar] 3d¹⁰4s²4p⁴

Question 26

A compound that is composed of carbon, hydrogen, and oxygen contains 70.6% C, 5.9% H, and 23.5% O by mass. The molecular weight of the compound is 136 amu. What is the molecular formula?

Answer 26

C₈H₈O₂

Question 27

A 22.5g sample of ammonium carbonate contains ________ mol of ammonium ions

Answer 27

0.468 (NH₄)₂CO₃ --- Sub2 means TWO MOLES AMMONIUM

Question 28

When H₂SO₂ is neutralized by NaOH in aqueous solution, the net ionic equation is ________

Answer 28

H⁺ (aq) + OH⁻ (aq) --> H₂O (l)

Question 29

What are the spectator ions in the reaction between KOH (aq) and HNO₃ (aq)?

Answer 29

K⁺ and NO₃⁻

Question 30

What is the molarity formula? and the units?

Answer 30

M=moles/volume molarity=moles/liters

Question 31

How many K⁺ moles are present in 343 mL of a 1.27 M solution of potassium phosphate?

Answer 31

1.31

Question 32

A 31.5 mL aliquot of H₂SO₄ (aq) of unknown concentration was titrated with 0.0134 M NaOH (aq). It took 23.9 mL of the base to reach the endpoint of the titration. The concentration (M) of the acid was _______

Answer 32

0.0051

Question 33

Distillation formula?

Answer 33

M₁V₁=M₂V₂

Question 34

The reaction of 50 mL of N₂ gas with 150mL of H₂ gas to form ammonia will produce _______mL ammonia if pressure and temperature are constant

Answer 34

100

Question 35

What mass (g) of NaN₃ is required to provide 40.0 L of N₂ at 25.0⁰C and 763 torr? 2NaN₃ (s) --> 2Na (s) + 3N₂ (g)

Answer 35

71.7

Question 36

What is the conversion from atm to torr?

Answer 36

1 atm = 760 torr // 760 mmHg

Question 37

What volume (L) of NH₃ gas at STP is produced by the complete reaction of 7.5 g of H₂O according to the following reaction? Mg₃N₂ (s) + 6H₂O (l) --> 3Mg(OH)₂ (aq) + 2NH₃ (g)

Answer 37

3.1 STP: 1 mol = 22.4 L Pressure= 1 atm Temperature = 273 K

Question 38

STP conditions?

Answer 38

Pressure= 1 atm Temperature = 273 K 1 mol = 22.4 L

Question 39

An ideal gas differs from a real gas in that the molecules of an ideal gas _________

Answer 39

have no attraction for one another

Question 40

What is Charles' Law?

Answer 40

V₁ V₂ ---- = ---- T₁ T₂

Question 41

A 3.5 L Scuba tank at 33 C was filled from a 12.0 L nitrogen tank at 27 C and 1.25 atm and a 10.8 L oxygen tank at 23 C and 1.15 atm. What is the total pressure in the tank? Partial pressure of Nitrogen and Oxygen?

Answer 41

Total Pressure = 8.04 atm Partial Pressure: Nitrogen= 4.286 Oxygen= 3.55

Question 42

The energy of a photon that has a wavelength of 13.2 nm is _______ J

Answer 42

1.51 x 10⁻¹⁷ J 3x10⁸= (13.2 x 10⁻⁹)f f=2.27 x 10¹⁶ E= (6.626 x 10⁻³⁴)(2.27 x 10¹⁶) E=1.51 x 10⁻¹⁷ J

Question 43

What is the formula for the combined gas law?

Answer 43

V₁P₁ V₂P₂ ------- = ------ n₁T₁ n₂T₂

Question 44

The pressure of a sample of CH₄ gas (6.022 g) in a 30.0 L vessel at 402 K is ______ atm.

Answer 44

0.413

Question 45

What elements are insoluble?

Answer 45

S // alkali metals, NH₄, Sr, Ba, Ca OH // alkali metals, NH₄, Sr, Ba, Ca CO₃ // alkali metals, NH₄ PO₄ // alkali metals, NH₄

Question 46

What elements are soluble?

Answer 46

NO₃⁻ and C₂H₃O₂ // always Cl, Br, I // Ag, Hg, Pb SO₄ // Sr, Ba, Ca

Question 47

Constant for R

Answer 47

0.0821