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Chem Midterm Review 25-26

Total questions: 52

Worksheet time: 55mins

Name
Class
Date
1.

Which color in the visible spectrum has the shortest wavelength?

a)

Red

b)

Green

c)

Yellow

d)

Violet

e)

Orange

2.

Arrange the following elements in order of increasing atomic radius: Rb, Li, K, Na

a)

Li, Na, K, Rb

b)

Rb, K, Na, Li

c)

Na, Li, K, Rb

d)

Li, K, Na, Rb

3.

A horizontal row in the periodic table is called a:

a)

group

b)

period

c)

noble gas

d)

halogen

4.

What is the general valence electron configuration of a halogen?

a)

3s²3p¹

b)

3s²3p²

c)

3s²3p⁵

d)

3s²3p⁶

5.

Element B from group 2 bonds with Element E from group 15. What is the chemical formula of this compound?

a)

B₃E₂

b)

B₂E₃

c)

B₃E

d)

BE₃

6.

The mass of a hydrogen atom is 0.00000000000000000000000167 g. What is this number in scientific notation?

a)

1.67 × 10⁻²⁴ g

b)

1.67 × 10²⁴ g

c)

1.67 × 10⁻²³ g

d)

1.67 × 10⁻²⁶ g

7.

What is the result of converting 532 centigrams to grams?

a)

0.00532 g

b)

0.0532 g

c)

0.532 g

d)

5.32 g

8.

A newly discovered element, Novium, has two naturally occurring isotopes: Nv-100 and Nv-104. In a sample, 75% of the atoms are Nv-100 and 25% are Nv-104. Calculate the average atomic mass of Novium.

a)

101.0 amu

b)

102.0 amu

c)

103.0 amu

d)

104.0 amu

9.

How many protons, neutrons, and electrons are in this unknown ion? The ion is represented as: 1942X3+^{42}_{19}X^{3+}

a)

19 protons, 19 electrons, 23 neutrons

b)

19 protons, 16 electrons, 23 neutrons

c)

19 protons, 16 electrons, 19 neutrons

d)

16 protons, 19 electrons, 23 neutrons

10.

What is the maximum number of electrons in the second principal energy level?

a)

2

b)

6

c)

8

d)

10

11.

How many valence electrons does a sulfur atom have?

a)

4

b)

6

c)

8

d)

2

12.

What is the total number of valence electrons in an atom with the following electron configuration: 1s²2s²2p⁶3s²3p³?

a)

6

b)

2

c)

3

d)

5

13.

Which of the following sets correctly matches the symbol and name for each ion?

a)

Pb2+: lead(II) ion; Pb4+: lead(IV) ion

b)

Co2+: cobalt(II) ion; Co3+: cobalt ion

c)

Sn2+: tin(IV) ion; Sn4+: tin(II) ion

d)

I-: iodine ion; Cl-: chlorine ion

14.

What is the correct name for Fe₂(SO₄)₃?

a)

iron(II) sulfate

b)

iron(III) sulfate

c)

diiron trisulfate

d)

ferrous sulfate

e)

iron sulfate

15.

Balancing chemical equations ensures compliance with which scientific law?

a)

Law of definite proportions

b)

Principle of Avogadro

c)

Law of conservation of mass

d)

Law of multiple proportions

16.

What are the missing coefficients for the chemical equation below? FeCl₃ (aq) + NaOH (aq) → Fe(OH)₃ (s) + NaCl (aq)

a)

1,3,1,3

b)

2,6,2,6

c)

1,6,2,3

d)

2,3,2,3

17.

What are the missing coefficients for the chemical equation below? C2H4(g)+O2(g)→CO2(g)+H2O(g)C_2H_4 (g) + O_2 (g) \rightarrow CO_2 (g) + H_2O (g)

a)

1,3,2,2

b)

2,2,4,2

c)

1,2,2,2

d)

2,3,2,2

18.

Which of the following chemical equation symbols is correctly matched with its meaning?

a)

(g), gaseous state

b)

(aq), acid solution

c)

(s), solution

d)

(l), lithium

19.

When the following equation is balanced, NaClO3(s)→NaCl(s)+O2(g)NaClO_3 (s) \rightarrow NaCl(s) + O_2 (g) , the coefficient of NaClO3NaClO_3 is _____.

a)

1

b)

2

c)

3

d)

4

20.

Which type of reaction is represented by the equation: N2+3H2→2NH3N_2 + 3H_2 \rightarrow 2NH_3 ?

a)

Decomposition reaction

b)

Combustion reaction

c)

Synthesis reaction (combination reaction)

d)

Double replacement reaction

21.

The equation Zn(s)+2HCl(aq)→ZnCl2(aq)+H2(g)Zn(s) + 2HCl(aq) \rightarrow ZnCl_2(aq) + H_2(g) is an example of which type of reaction?

a)

Single replacement reaction

b)

Double displacement reaction

c)

Synthesis reaction (combination reaction)

d)

Combustion reaction

22.

Which of the following is a non-metal?

a)

Potassium

b)

Neon

c)

Silver

d)

Iron

23.

What is the charge on a sodium ion when it forms?

a)

+1

b)

+2

c)

-1

d)

-2

24.

Which pair of elements is most likely to form a covalent compound?

a)

Chlorine and sulfur

b)

Iron and copper

c)

Calcium and magnesium

d)

Silver and gold

25.

What is the number of valence electrons in magnesium?

a)

1

b)

2

c)

6

d)

8

26.

Which of the following elements is classified as a main group element rather than a transition metal?

a)

Nickel

b)

Chromium

c)

Magnesium

d)

Silver

27.

Which element is most likely to attract electrons in a chemical bond?

a)

Potassium

b)

Bromine

c)

Fluorine

d)

Nitrogen

28.

Compared to a 700 nm photon, a 480 nm photon has:

a)

shorter wavelength, higher frequency, higher energy.

b)

longer wavelength, lower frequency, lower energy.

c)

shorter wavelength, lower frequency, higher energy.

d)

longer wavelength, higher frequency, lower energy.

29.

What is the maximum number of electrons that can occupy the f sublevel?

a)

10

b)

14

c)

7

d)

6

30.

A double replacement reaction occurs when iron (III) nitrate (Fe(NO₃)₃) reacts with sodium hydroxide (NaOH). One of the products would be _____.

a)

Fe(OH)₃

b)

NaNO₃

c)

FeNa₃

d)

Na(OH)₃

e)

Fe(NO₃)₂

31.

Which gas is always required for a combustion reaction to occur?

a)

carbon dioxide

b)

oxygen gas

c)

helium

d)

chlorine gas

32.

Which of the following pairs has the correct chemical name and formula?

a)

potassium sulfide, K₂SO₄

b)

magnesium bromide, MgBr₂

c)

iron(III) oxide, FeO

d)

calcium phosphate, CaPO₄

e)

lead(II) nitrate, Pb(NO₃)₄

33.

Which of the following correctly shows a prefix used in naming covalent compounds with its corresponding number?

a)

tetra-, 4

b)

penta-, 2

c)

hepta-, 6

d)

tri-, 8

34.

When group 13 elements form ions, they ______.

a)

lose three electrons.

b)

lose three protons.

c)

gain three protons.

d)

gain three electrons.

35.

A chemist has 50.0 grams of solid magnesium. What should they do to calculate the number of moles of magnesium present?

a)

They would divide by the molar mass of magnesium.

b)

They would multiply by the molar mass of magnesium.

c)

They would divide by Avogadro’s number.

d)

They would multiply by Avogadro’s number.

36.

What is the volume, in liters, of 4.5 moles of Ne gas at STP?

a)

101 L

b)

22.4 L

c)

4.5 L

d)

0.20 L

37.

How many representative particles are found in 11.2 L of CO₂ at STP?

a)

3.0 x 10²³ particles

b)

6.0 x 10²³ particles

c)

1.2 x 10²⁴ particles

d)

2.4 x 10²⁴ particles

38.

What is the formula mass of FeSO₄?

a)

151.9 g/mol

b)

278.0 g/mol

c)

207.9 g/mol

d)

200.0 g/mol

39.

If there is one mole of O₂ gas and one mole of He gas, which of the following statements is TRUE?

a)

O₂ has a greater volume.

b)

He has a greater volume.

c)

They both have the same volume.

d)

There is not enough information.

40.

What is the percent composition of barium in BaCrO₄?

a)

58.7%

b)

52.1%

c)

45.2%

d)

36.4%

41.

How many formula units of magnesium chloride are in 7.50 grams of the sample?

a)

3.01 x 1022 formula units

b)

1.50 x 1022 formula units

c)

6.02 x 1023 particles

d)

2.51 x 1022 formula units

e)

4.80 x 1022 formula units

42.

What particles form the nucleus of an atom?

a)

protons and electrons

b)

neutrons and electrons

c)

protons and neutrons

d)

electrons only

43.

Answer using the correct sig figs: 2.5×10103.56×10−7\frac{2.5\times10^{10}}{3.56\times10^{-7}}

a)

7.0 × 1016

b)

7

c)

1.4 × 10-17

d)

5.0 × 1016

44.

Group 1 elements are called:

a)

Halogens

b)

Alkaline Earth Metals

c)

Alkali Metals

d)

Noble Gases

45.

Which one of the following would result in a reaction?

a)

Iron with magnesium chloride

b)

magnesium with iron chloride

c)

Iron with Zinc Sulphate

d)

gold with silver nitrate

46.

What will be the result of : Zn + AuCl2->

a)

ZnCl2 +Au

b)

ZnAu + Cl2

c)

no reaction

d)

ClAu + Zn

47.

Which of the waves shown is the lowest energy radiation?

a)

A

b)

B

c)

C

d)

All three waves are at the same energy.

e)

None of these.

48.

What is the energy of a quantum of light with a frequency of 7.39x1014Hz. ( E=hνE=h\nu )

a)

4.88x1019 J

b)

4.88x10-19 J

c)

2.22x1023 J

d)

2.22x10-23 J

49.

The frequency of violet light is 7.5x1014 Hz. What is its wavelength? ( c=λνc=\lambda\nu )

a)

4.0x10-7 m

b)

4.0x107 m

c)

2.25x1023m

d)

2.25x1023 Hz

50.
Look at the periodic table that is provided. Where would nonmetals be located? 
a)
to the left of the table 
b)
to the right of the table 
c)
in the zigzag line 
51.
Look at the periodic table that is provided. Where would metals be located? 
a)
to the left of the table 
b)
to the right of the table 
c)
in the zigzag line 
52.

Look at the periodic table that is provided. Where would semimetals/metalloids be located? 

a)

to the left of the table 

b)

to the right of the table 

c)

in the zigzag line 

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