Chemistry Answers

25cm^3 of magnesium Chloride compleatly reacted with 12.5cm^3 of 0.2M silver nitrate to precipitate silver Chloride .Haw many grams of magnesium Chloride are contained in 500cm^3 of the solution

1)Rank the following in terms lf increasing boiling point:

CaBr₂

C₂H₅OH

C₄H₁₀

2) Rank these substances from lowest to highest intermolecular forces:

HF

F₂

PCl₃

3)Rank the following in terms of increasing melting point:

MgCl₂

NaCl

AlCl₃

1)Rank the following in terms lf increasing boiling point:

CaBr²

C²H⁵OH

C⁴H¹⁰

2) Rank these substances from lowest to highest intermolecular forces:

HF

F²

PCl³

3)Rank the following in terms of increasing melting point:

MgCl²

NaCl

AlCl³

Which of the following shows the increasing boiling points of halogens?

A. F₂<I₂<Br₂<Cl₂

B. I₂<Cl₂<Br₂<F₂

C.Cl₂<Br₂<I₂<F₂

D. F₂<Cl₂<Br₂<I₂

1.Calculate the Molarity of a solution that contains 20.0 g NaCl in 0.30 L of solution.

2.Calculate the mass in grams of lithium nitrite of 120. mL of 0.500 M solution.

Describe how to prepare the solution.

3 Write the molecular, ionic and net ionic equations for the reactions in 26 and 27 between the following. If

there is no net ionic equation, write “no net ionic equation”:

potassium carbonate and sodium nitrate

Which of the following 1.00 m solutions has the highest boiling temperature?

a) Na2S

b) LiNO3

c) (NH4)3PO4

d) sucrose

Of the following solutions, ................ has the highest freezing temperature and

.................... has the lowest freezing temperature? Your answer should include two

letters in the correct order.

a) 5.0 m KCl

b) 3.0 m LiNO3

c) 2.0 m (NH4)3PO4

d) sucrose

30 .......................The freezing point depression constant, Kf of H2O = 1.86 oC/ m-1

The boiling point elevation constant, Kb of H2O = 0.52 oC oC/ m

Calculate the boiling temperature of a solution of 2.00 m AlCl3

The central atom in the iodite ion, IO2 - , is surrounded by

[1] 1 single bond, 1 double bond and 2 lone pairs of electrons.

[2] 3 bonding pairs and 1 unshared pair of electrons.

[3] 1 bonding pair and 3 unshared pairs of electrons.

[4] 2 double bonds and no unshared pairs of electrons.

[5] 4 bonding pairs and 4 lone pairs of electrons.

An example of a compound that contains an atom with an expanded octet of electrons is [1] NaBF4

[2] NH4Cl

[3] SF4

[4] NaClO4

[5] BF3 

Which of the following compounds contains both ionic and covalent bonds?

[1] ClF

[2] SO2

[3] NaCl

[4] SO3

[5] NaCN

Which of the following sets of quantum numbers is not allowed?

[1] n = 3, l = 1, ml = -1, ms = + ½

[2] n = 2, l = 1, ml = 0, ms = + ½

[3] n = 3, l = 0, ml = 0, ms = + ½

[4] n = 2, l = 2, ml = -1, ms = - ½

[5] n = 2, l = 1, ml = -1, ms = - ½ 

All of the following statements about the quantum numbers are true except

[1] n has integral values from 1 to ∞.

[2] l has values from 1 to ∞.

[3] ml has 2l + 1 possible values

[4] ml has values of –l to +l including zero.

[5] ms has values of +½ and -½.