Exam 2

Question 1:

What is the name of the molecular compound SF₅

Answer:

sulfur pentafluoride

Question 2:

What is the formula for an ionic compound made of barium and nitrogen

Answer:

Ba₃N₂

Question 3:

Which Lewis Structure below correctly represents KCl

Answer:

	..
K⁺	[: Cl :]^-
	..

Question 4:

What is the correct Lewis structure for CN^-

Answer:

[: C =_{_} N :]^-

Question 5:

Which molecule listed below is a polar molecule

Answer:

all of the compounds

Question 6:

How many valence electrons are in a chlorine atom

Answer:

7

Question 7:

What is the correct Lewis structure for water

Answer:

	..
H-	O	-H
	..

Question 8:

Consider the following electronegativity values:
H = 2.1
Cl = 3.0
F = 4.0

Which molecule below would you expect to have th emore polar bond

Answer:

HF

Question 9:

How many total atoms are in the formula Al₂(CO₃)₃

Answer:

12

Question 10:

What is the formula for an ionic compound made of magnesium and sulfur

Answer:

MgS₂

Question 11:

What is the molecular geometry of SiH₄

Answer:

tetrahedral

Question 12:

The subshell that has three orbitals and can hold up to six electrons is the

Answer:

p subshell

Question 13:

The size of an atom generally increases

Answer:

down a group and from right to left across a period

Question 14:

Which element is represented by the electron configuration 1s²2s²2p²

Answer:

C

Question 15:

Which of the following elements has the lowest ionization energy

Answer:

Rb

Question 16:

Which among the follwoing elements does NOT exist as a diatomic molecule in nature

Answer:

neon

Question 17:

Which of hte following atoms has the greatest metallic character

Answer:

Cs

Question 18:

Consider the electron configuration of the ion to determine which ion shown below has an incorrect ionic charge

Answer:

Al^3-

Question 19:

Carbon monoxide is considered which of the following

Answer:

molecular compound

Question 20:

What is the formula mass for diboron tetrachloride

Answer:

163.43 amu

Question 21:

The ionic compound that forms between potassium and oxygen is

Answer:

K₂O

Question 22:

Which of the following statements about physical and chemical changes is FALSE

Answer:

All of the above statements

Question 23:

What is the electron configuration for P

Answer:

[Ne]3s²3p³

Question 24:

What is the value of 335 K on the Celsius temperature scale

Answer:

62

Question 25:

What is the correct formula for a compound that has three oxygen atoms and one sulfur atom

Answer:

SO₃

Question 26:

What is the molecular geometry if you have 3 single bonds and 1 lone pair around the central atom

Answer:

trigonal pyramidal

Question 27:

How many valence electrons are in the nitrate ion? Hint: remember to add or subtract electrons according to the charge

Answer:

24

Question 28:

How many of each type of atom are there in the formula (NH₄)₂HPO₄

Answer:

N = 2, H = 9, P = 1, O = 4

Question 29:

Based on their electronegativity values, what type of bond is expected for a compound formed between Mg and O

Answer:

ionic

Question 30:

Chlorine and bromine have very similar chemical properties. This is best explained by the fact that both elements

Answer:

have the same number of valence electrons

Question 31:

Which molecule listed below has a nonpolar covalent bond

Answer:

H₂

Question 32:

What is the formula for the acetate poyatomic ion

Answer:

C₂H₃O₂^-

Question 33:

What is the name of Ca(NO₃)₂

Answer:

calcium nitrate

Question 34:

What is the name of CoS

Answer:

cobalt (II) sulfide

Question 35:

Which of the following statements about Lewis structures is FALSE

Answer:

All of the above statements are true

Question 36:

Which Lewis struture below correctly represents the compound formed btween magnesium and sulfur

Answer:

		..
Mg²⁺	[:	-S	:]^-2
		..

Question 37:

Which of the following atoms is the largest

Answer:

Cs

Question 38:

What is the formula mass of copper(II) fluoride

Answer:

101.55

Question 39:

The Olympic games shot put field event uses 16 pounds (lbs) shot. Identify the correct solution map to convert from pounds to kilograms using prefix multipliers and the given conversion of 16oz = 1lb and 453.2 g =16oz

Answer:


16x	16oz1lb	x	453.6g16oz	x	1 kg10³ g

Question 40:

What is the correct formula for the molecularcompountd heptaphosphorus octafluoride

Answer:

P₇F₈

Question 41:

How many of each type of atom are there in the formula Ca₃(PO₄)₂

Answer:

Ca = 3, P = 2, O = 8

Question 42:

What is the correct name of the compound whose formula is N₂O₄

Answer:

dinitrogen tetroxide

Question 43:

Determine the answer for the equation below with correct number of significant figures

Answer:

195

Question 44:

What is the electron configuration for Ga

Answer:

1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p¹

Question 45:

What is the correct Lewis structure for CO₂

Answer:

:	O	=	C	=	O	:
	..				..

Question 46:

What would the formula of diiodine pentasulfide be

Answer:

I₂S₅

Question 47:

Which of the following is considered a singel electron group

Answer:

all of the above

Question 48:

Which of the following statements about the nature of electrical charge is FALSE

Answer:

all of the above statements are true

Question 49:

Which formula shown is incorrect for the name given

Answer:

magnesium nitrite: Mg(NO₂)₃

Question 50:

Which of the following species is a molecular element (diatomic molecule)

Answer:

chlorine