General Chemistry Answers

Pure magnesium metal is often found as ribbons and can easily burn in the presence of oxygen. When 2.56 g

2.56 g of magnesium ribbon burns with 8.36 g

8.36 g of oxygen, a bright, white light and a white, powdery product are formed.

Enter the balanced chemical equation for this reaction. Be sure to include all physical states.

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

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.

Which statement is wrong?

[1] The atomic weight of carbon is about 12.

[2] The most stable ion of lithium is Li+ .

[3] A phosphorus atom is larger than an antimony atom.

[4] The radius of a sodium atom is larger than that of a sodium cation.

[5] Oxygen has a less negative electron affinity than fluorine.