Unit 4

Question 1

Which gases are unreactive (inert)?

Answer 1

Noble gases, group 18

Question 2

What is an ion?

Answer 2

an atom or group of atoms with a charge

Question 3

What takes place in an ionic bond?

Answer 3

oppositely-charged ions attract, metal + nonmental

Question 4

What takes place in a covalent bond?

Answer 4

electrons are shared between nonmetals

Question 5

How many electrons are shared between two atoms in a double covalent bond?

Answer 5

4

Question 6

How many electron pairs are ion Nitrogen on in NH₃?

Answer 6

3 bond pairs and 1 lone pair, 4 total

Question 7

What type of bonding is found in a carbon dioxide molecule?

Answer 7

Covalent, 2 nonmetals bonding

Question 8

What shape does a water molecule have?

Answer 8

bent

Question 9

What molecular shape is SO₃⁻²?

Answer 9

trigonal pyramidal

Question 10

In the Lewis dot structure, what do the dots represent?

Answer 10

valence electrons

Question 11

What is the correct ionic symbol for strontium?

Answer 11

Sr²⁺ , all group 2 on the periodic table have a charge of ²⁺

Question 12

What charge does group 1 ions have?

Answer 12

+1

Question 13

Will group 1 atoms lose or gain an electron when forming an ion?

Answer 13

lose an electron

Question 14

Will nonmetals, like sulfur, gain or lose electrons when forming an ion?

Answer 14

gain electrons

Question 15

What type of bond does NaCl have?

Answer 15

Ionic, because it is between a metal and nonmetal

Question 16

What type of bond does O₂ have?

Answer 16

nonpolar covalent, because the electrons are shared equally

Question 17

What type of bond does HF have?

Answer 17

polar covalent, because the electrons are not shared equally

Question 18

What is the correct name and formula formed between Sodium and Sulfur?

Answer 18

Sodium Sulfide, Na₂S (using the binary ionic bond rules Na⁺ and S⁻²)

Question 19

Name 3 characteristics of a covalent bond.

Answer 19

1)electrons are shared, 2) poor conductors of electricity, 3)low melting and boiling points

Question 20

Where are nonmetals located on the periodic table?

Answer 20

right side

Question 21

Carbon dioxide has how many double bonds?

Answer 21

2

Question 22

How many pairs of unshared electrons does H₂S have?

Answer 22

2

Question 23

What geometric shape does BH₃ have?

Answer 23

trigonal planar

Question 24

What geometric shape does CH₄ have?

Answer 24

tetrahedral

Question 25

What is the name of the compound NiN?

Answer 25

Nickel (III) nitride, using the binary ionic rules for multivalence metals Ni⁺³ N⁻³

Question 26

What is the name of the compound Fe₂S₃

Answer 26

What is the name of the compound Fe₂S₃ Iron (III) sulfide, using the binary ionic rules for multivalence metals Fe⁺³ S⁻²

Question 27

What is the name of the chemical formula NH₄Br?

Answer 27

Ammonium bromide, using the polyatomic ionic rules for NH₄⁺ Br⁻

Question 28

What is the name of the chemical formula for K₂CrO₄?

Answer 28

Potassium chromate, using the polyatomic ionic rules for K⁺ CrO₄²⁻

Question 29

What is the name of the chemical formula for KCN?

Answer 29

Potassium cyanide, using the polyatomic ionic rules for K⁺ CN⁻

Question 30

What is the name of the compound with a chemical formula P₄O₁₀?

Answer 30

tetraphosphorus decoxide, using the covalent rules

Question 31

What is the chemical formula for carbon dioxide?

Answer 31

CO₂, using the covalent rules

Question 32

What is the chemical formula for magnesium hydroxide?

Answer 32

Mg(OH)₂ , using the polyatomic ionic rules for Mg²⁺ OH⁻

Question 33

If a compound has the ability to conduct electricity, is soluble and has a high melting point, the compound is most likely ____

Answer 33

ionic

Question 34

What is the structure for CBr₄?

Answer 34

4 single bonds,

Question 35

What type of bond would happen between an element from group 2 and group 17?

Answer 35

ionic, group 2 loses an electron, group 17 gains an electron

Question 36

What is the correct Lewis structure for NH₃?

Answer 36

*