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PreAP Chemistry 2023 Spring Final

Total questions: 40

Worksheet time: 20mins

Name
Class
Date
1.

Which is the MOST electronegative atom?

a)

Fluorine

b)

Hydrogen

c)

Lithium

d)

Oxygen

2.

Which is the LEAST electronegative atom?

a)

Fluorine

b)

Oxygen

c)

Bromine

d)

Lithium

3.

Determine the electronegativity difference and bond time between:

Na & Cl

a)

1.5

Polar Covalent

b)

0.2

Nonpolar Covalent

c)

2.1

Ionic

d)

3.0

Ionic

4.

Determine the electronegativity difference and bond time between:

O and C

a)

1.0

Polar Covalent

b)

0.2

Nonpolar Covalent

c)

2.9

Ionic

d)

3.5

Ionic

5.

In order to be considered an ionic bond, the electronegativity difference between two atoms has to be:

a)

Less than 0.3

b)

Between 0.3 to 1.7

c)

Greater than 1.7

d)

Zero

6.

Which of these are one of the seven diatomic elements?

a)

O2

b)

K2

c)

P2

d)

Na2

7.

What is the correct formula for:

Dinitrogen pentabromide

a)

NiBr

b)

NCl

c)

Li2Cl5

d)

N2Br5

8.

What is the correct formula for:

Carbon monoxide

a)

NaCl

b)

CO

c)

CaO2

d)

SO4

9.

What is the correct formula for:

Trihydrogen dioxide

a)

FN

b)

H2O2

c)

HBr

d)

H3O2

10.

How do we remember the 7 diatomic elements?

a)

LaUn

b)

BrINClHOF

c)

MoP

d)

HI

11.

How many valence electrons does beryllium have?

a)

1

b)

2

c)

3

d)

4

12.

How many valence electrons does neon have?

a)

2

b)

14

c)

6

d)

8

13.

How many total electrons are in the lewis structure:

BeF2?

a)

5

b)

66

c)

16

d)

3

14.

A single bond (line) in lewis structures contain how many electrons?

a)

2

b)

9

c)

0

d)

3

15.

What is the central atom in the following lewis structure:

BCl3?

a)

Cl

b)

C

c)

B

d)

Na

16.

If a lewis structure has an EDR of 3, what is the electron geometry?

(Hint: look at the prefix of the answer choices)

a)

Tetrahedral

b)

Octahedral

c)

Trigonal planar

17.

If a lewis structure has an EDR of 4, what is the electron geometry?

(Hint: look at the prefix of the answer choices)

a)

Tetrahedral

b)

Octahedral

c)

Trigonal planar

18.

A lewis structure has 2 bonding pairs and 1 lone pair. How many electron dense regions (EDR) does it have?

a)

0

b)

23

c)

3

d)

7

19.

A lewis structure has 4 bonding pairs and 0 lone pairs. How many electron dense regions (EDR) does it have?

a)

4

b)

20

c)

7

d)

5

20.

What two numbers do you add to determine the electron dense regions (EDR)?

a)

Valence electrons

b)

Bonding pair and lone pair

c)

Electronegativities

d)

Protons

21.

Balance the following chemical equations by selecting the correct number for the missing coefficient.

____  PCl5  →  PCl3  +  Cl2

a)

1

b)

2

c)

3

d)

4

22.

Balance the following chemical equations by selecting the correct number for the missing coefficient. 

____  N2  +  O2  →  2 N2O

a)

1

b)

2

c)

3

d)

4

23.

Identify the following chemical equations by selecting its correct reaction type from the list.

____  PCl5  →  PCl3  +  Cl2

a)

Single replacement

b)

Combustion

c)

Decomposition

d)

Synthesis

24.

Identify the following chemical equations by selecting its correct reaction type from the list. 

____  N2  +  O2  →  2 N2O

a)

Synthesis

b)

Double replacement

c)

Combustion

d)

Decomposition

25.

What must be present in a combustion reaction?

a)

O2, CO2, H2O

b)

Na, Cl, K

c)

H, F, S

d)

C, Cl, K

26.

H2 + I2 → 2 HI

Given: 0.5 moles HI produced

Wanted: moles of H2 reacted?

a)

25 moles H2

b)

0.3 moles H2

c)

1.2 moles H2

d)

15 moles H2

27.

2 Fe2O3 + 3 C → 4 Fe + 3 CO2

Given: 250 grams CO2 produced

Wanted: grams of Fe produced?

a)

102 grams Fe

b)

21 grams Fe

c)

420 grams Fe

d)

9 grams Fe

28.

What is the mole ratio between HF and H2O in the following equation:

2 HF + Sr(OH)2 → SrF2 + 2 H2O

a)

2 mol HF 2 mol H2O\frac{2\ mol\ HF\ }{2\ mol\ H_2O}

b)

3 mol HF1 mol H2O\frac{3\ mol\ HF}{1\ mol\ H_2O}

c)

4 mol SrF2 mol HF\frac{4\ mol\ SrF}{2\ mol\ HF}

d)

1 mol H2O4 mol HF\frac{1\ mol\ H_2O}{4\ mol\ HF}

29.

What is the molar mass of the compound Fe2O3?

a)

9 grams/mol

b)

232 grams/mol

c)

1839.2 grams/mol

d)

159.69 grams/mol

30.

Which type of stoichiometry is used to solve this problem?

2 ZnS + 3 O2 → 2 ZnO + 2 SO2

Given: 250 grams ZnS reacted

Wanted: grams of SO2 produced?

a)

Type 1: Mol to Mol

b)

Type 2: Mol to Grams

c)

Type 3: Grams to Mol

d)

Type 4: Grams to Grams

31.

A solution is formed by adding 35 g of ammonium nitrate to 250 g of water. What is the percent by mass of ammonium nitrate?

a)

50 %

b)

100 %

c)

6.25 %

d)

0.50 %

32.

What are the two components of a solution?

a)

Solvent and Solute

b)

Proton and Electron

c)

Neutron and Proton

d)

Mass and Moles

33.

What is the difference between solute and solvent?

a)

Solute: gas

Solvent: solid

b)

Solute: gets dissolved

Solvent: dissolving medium

c)

Solute: dissolving medium

Solvent: gets dissolved

d)

Solute: liquid

Solvent: solid

34.

initial concentration (M1): 2.809 M

initial volume (V1): 1.3 L

final volume (V2): 1.86 L

Wanted: molarity of dilute solution (M2)?

a)

1.5 M

b)

2.0 M

c)

300 M

d)

21 M

35.

amount of solute (n): 0.0634 mol Na2O

volume (V): 1.7 L

Wanted: molarity of solution (M)?

a)

121 M

b)

0.21 M

c)

0.037 M

d)

0.999 M

36.

In the following equation, which is the acid and its conjugate base?:

   PO43-    +          HNO3   ↔        HPO42- +          NO31-

a)

Acid: NO

CB: PO

b)

Acid: PO43-

CB: HPO42-

c)

Acid: HNO3

CB: NO31-

d)

Acid: HPO42-

CB: PO43-

37.

In a conjugate acid base pair, which of the following is correct?

a)

Acids lose a H

Bases gain a H

b)

Acids lose a C

Bases gain a C

c)

Acids gain a P

Bases lose a P

d)

Acids lose a W

Bases gain a W

38.

Acids have a pH ________ 7

a)

less than

b)

greater than

c)

equal to

39.

Bases have a pH ________ 7

a)

less than

b)

greater than

c)

equal to

40.

Pure water is considered to be neutral pH, which has a value of:

a)

6

b)

9

c)

8

d)

7

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