Chemistry Test 3 review

Question 1

Which intermolecular force is the WEAKEST?

Accepted Answer

London dispersion force

Question 2

What shape does VSEPR theory predict for a molecule of ammonia, NH3?

Accepted Answer

trigonal pyramid

Question 3

Find the formula for calcium nitride, an ionic compound made up of Ca+2 and N-3 ions

Accepted Answer

Ca3N2

Question 4

What type of bond is usually formed between two nonmetals?

Accepted Answer

covalent

Question 5

What is the same and what is different about a pair of isotopes?

Accepted Answer

Atomic number is the same; mass number is different

Question 6

Which pair of elements form a compound that is hard, brittle, and has a high melting point?

Accepted Answer

Na and Cl

Question 7

Elements with the most metallic character have

Accepted Answer

the lowest ionization energy and electronegativity

Question 8

Mn is a/an

Accepted Answer

metal

Question 9

Na is a

Accepted Answer

metal

Question 10

Which of these substances probably has covalent bonding?

Accepted Answer

CO2

Question 11

compared to single covalent bonds, double bonds are usually

Accepted Answer

shorter and stronger

Question 12

S is a

Accepted Answer

nonmetal

Question 13

What shape does VSEPR Theory predict for a molecule of CH4, methane?

Accepted Answer

tetrahedral

Question 14

The electronegativity of H is 2.20 and that of O is 3.44. What type of bond is formed in H2O?

Accepted Answer

polar covalent

Question 15

Place these elements in order of increasing ionization energy: Si, Mg, S

Accepted Answer

Mg < Si < S

Question 16

Find the formula for potassium oxide, an ionic compound made up of K+ and O-2

Accepted Answer

K2O

Question 17

Which is the best description of covalent bonding?

Accepted Answer

atoms sharing electrons to fill valence levels

Question 18

Ar is a

Accepted Answer

noble gas

Question 19

When sodium, Na, forms an ion, what is the charge?

Accepted Answer

+1

Question 20

In the alpha decay 21486Rn --> 42He + X, what is X?

Accepted Answer

21084Po

Question 21

Atoms of which element are expected to have the lowest electronegativity?

Accepted Answer

Sr

Question 22

What kind of bond is formed between two atoms having an electronegativity difference of 2.1?

Accepted Answer

ionic

Question 23

How many electrons (total, not valence electrons) are there in a F- ion?

Accepted Answer

10

Question 24

Do metals tend to gain or lose electrons, and what kind of ions do they form?

Accepted Answer

metals lose electrons and form cations

Question 25

Based on periodic trends, which element do you expect to have the greatest atomic radius?

Accepted Answer

Ra

Question 26

What ion does sulfur (S) form?

Accepted Answer

-2

Question 27

A substance is a gas at room temperature but forms a liquid at very low temperatures. It is

Accepted Answer

most likely a molecule (covalent)

Chemistry Test 3 review

Questions 27

Chemistry Test 3 review

Questions 27