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Chemistry A CP Unit 2 Practice Test

Total questions: 60

Worksheet time: 1hrs 22mins

Name
Class
Date
1.

____ are particles located in the nucleus with an electric charge of +1. The number of these in the nucleus is unique for each element.

a)

Electrons

b)

Atoms

c)

Protons

d)

Neutrons

2.

Which subatomic particles determine the mass number of an atom? [Select all that apply]

a)

protons

b)

neutrons

c)

electrons

3.

The center of an atom that holds protons and neutrons is called the _____.

a)

isotope

b)
electron
c)
nucleus
d)

ion

4.

Measure the amount of liquid in the graduated cylinder to the correct number of significant figures.

a)

8.5 mL

b)

8.450 mL

c)

8.45 mL

d)

8.4 mL

5.

Measure the length of the rectangle shown.

a)

3.0 dm

b)

3.4 dm

c)

3.40 dm

d)

3.450 dm

6.

Which subatomic particle has a negative charge?

a)

proton

b)

neutron

c)

electron

d)

nucleus

7.

Round 1047.78 to three significant figures.

a)
104
b)
105
c)
1050
d)
1050.00
8.

How many significant figures are in the number 0.01020?

a)

6

b)

5

c)

4

d)

3

9.

Which of the following measured numbers has four significant figures?

a)

4000 cm

b)

0.0040 cm

c)

4 x 104 cm

d)

40.00 cm

10.

How many grams are equivalent to 1.800 X 10-4 US tons?

1 US ton = 2000 lb; 1 lb = 453.592 g

Please record your answer to the correct number of significant figures.

a)

2 x 106 g

b)

1.633 x106 g

c)

2 x 102 g

d)

1.633 x 102 g

e)

4.082 x 10-5 g

11.

If a person weighs 125.0 lbs, how many milligrams do they weigh?

Conversion factors: 1 lb = 453.592 g; 1 mg = 1 x 10-3 g

a)

5.670 x 107 mg

b)

5.670 x 101 mg

c)

2.756 x 102 mg

d)

2.756 x 10-4 mg

12.

A commercial passenger jet can fly at a speed up to 930 km/h. What is its speed in m/s?
Conversion factors: 1 h = 60 min; 1 min = 60 s; 1 km = 1 x 103 m

a)

260 m/s

b)

16000 m/s

c)

3300000000 m/s

d)

0.00026 m/s

e)

3300 m/s

13.

Which dimensional analysis set up is correct to solve for how many feet are between the first and second story of a building (1 story)?

Given: 1 story = 3.33 m; 1 cm = 1 x 10-2 m; 1 in = 2.54 cm; 1 ft = 12 in

a)

b)

c)

d)

14.

Which student is the most precise?

a)

Student A

b)

Student B

c)

Student C

15.

If the actual density of zinc is 7.134 g/mL, what can be said about Sara's data? [select all that apply]

a)

good precision

b)

poor precision

c)

good accuracy

d)

poor accuracy

16.

What isotope or ion is represented by the following information?

protons = 52

neutrons = 72

electrons = 54

a)

Te

b)

Hf

c)

Xe

d)

Te2-

e)

Xe2+

17.

How many total atoms are in Pb(HCO3)4 ?

a)

15

b)

24

c)

21

d)

10

e)

18

18.

Which of the following equations is balanced?

a)

PbO2 + 2H2 → H2SO4

b)

SO2 + H2O → H2SO4

c)

2Na + 2H2O → 2NaOH + H2

d)

2Na + 2H2O → 2NaOH + H

19.

Balance the equation:
_Si(OH)4 + _NaBr → _SiBr4 + _NaOH

a)

Si(OH)4 + 2NaBr → SiBr4 + NaOH

b)

Si(OH)4 + 4NaBr → SiBr4 + 4NaOH

c)

Si(OH)4 + NaBr → SiBr4 + 4NaOH

d)

Si(OH)4 + 2NaBr → SiBr4 + 2NaOH

20.

_FeCl3+ _H2SO4 → _Fe2(SO4)3+ _HCl

a)

2, 3, 1, 6

b)

2, 2, 1, 6

c)

2, 2, 1, 5

d)

2, 3, 1, 5

21.

Balance the following equation:

_SeCl6 + _O2 → _SeO2 + _Cl2

a)

1, 1, 1, 3

b)

2, 1, 2, 1

c)

1, 2, 1, 2

d)

2, 2, 2, 4

22.
What term describes a solid changing to a gas?
a)
Deposition
b)
Sublimation
c)
Evaporation
d)
Freezing
23.

When you freeze water, it turns to ice.  This process is ___.

a)

 exothermic

b)

endothermic

c)

cannot be determined

24.

What state of matter is present at -25 oC for this substance?

a)

solid

b)

liquid

c)

gas

d)

more than one state of matter is present

25.
In which state of matter are the atoms spaced the closest together?
a)
solid
b)
liquid
c)
gas
26.

The gas to liquid phase change is called ___.

a)

condensation

b)

evaporation

c)

sublimation

d)

deposition

27.

Which is a physical change?

a)
burning match 
b)

vinegar reacting in baking soda 

c)
melting butter
d)
cooking an egg
28.
Solids are described as having a 
a)
definite shape and indefinite volume
b)
indefinite shape and indefinite volume
c)
definite shape and definite volume
d)
indefinite shape and definite volume
29.

A student has a rectangular block. It is 2.13 cm wide, 3.05 cm tall, and 25.00 cm long. It has a mass of 600.95 g. What is the density of the block?

V = l × w × h

a)

30.2 g/cm3

b)

162 g/cm3

c)

0.270 g/cm3

d)

3.70 g/cm3

e)

19.9 g/cm3

30.

What is the volume (in L) of 280 g of lead if it has a density of 11.3 g/mL?

a)

25 L

b)

0.025 L

c)

0.043 L

d)

43 L

e)

3.2 L

31.
Question Image

Match the following

a)
1.

element

b)
2.

compound

c)
3.

mixture of two elements

d)
4.

mixture of two compounds

32.
A substance that contains only one type of atom is a(n)
a)
compound
b)
element
c)
heterogeneous mixture
d)
homogeneous mixture
33.
Which of the following is NOT a pure substance?
a)
milk
b)
oxygen
c)
water
d)
carbon dioxide
34.

How would you classify salt water?

a)

pure substance - element

b)

pure substances - compound

c)

mixture - homogeneous

d)

mixture - heterogeneous

35.

How many H atoms are in the formula?

a)
4
b)
2
c)
8
d)
24
e)

18

36.

Which of the following are isotopes?

a) 14 7X b) 14 6X c) 15 7X d) 15 8X

a)

a) and b)

b)

a) and c)

c)

c) and d)

d)

a) and d)

37.
What is the number of neutrons?
a)
34
b)
79
c)
45
d)
35
38.

During melting, the temperature ​ (a)   .

Choose from the below words
stays the same
increases
decreases
both increases and decreases
cannot be determined
39.

Given the heating curve for water, during which line segment could you find water in both the liquid and gas phase at the same time?

a)

AB

b)

BC

c)

CD

d)

DE

e)

EF

40.

NaCl(s) was heated up starting at an initial temperature of 0°C. The heating curve is shown in the picture. What is the melting point of this substance?

a)

0°C

b)

801°C

c)

1000°C

d)

1465°C

41.
How many neutrons would Fe-56 have?
a)
56
b)
26
c)
30
d)
33
42.
If an atom of nickel has a charge of +3, how many electrons does the atom have?
a)
28
b)
25
c)
26
d)
31
43.
How many protons does Pb-209 have?
a)
127
b)
209
c)
82
d)
291
44.

Which of the following has 14 neutrons?

a)
Al-27
b)
Si-29
c)
Mg-25
d)
Na-22
45.

Isotopes are atoms of the same element with different number of ___ and therefore different ___.

a)

neutrons; atomic numbers

b)

protons; atomic numbers

c)

electrons; mass numbers

d)

neutrons; mass numbers

46.

What is a mixture?

a)

combination of elements to make a new substance

b)

chemically combined substance

c)

combination of substances where new substances are formed through a reaction

d)

a physical combination of two or more substances that retains their own chemical properties

47.
High frequency waves have _________ wavelength.
a)
varying
b)

long

c)
the same
d)

short

48.

If an AM radio station broadcasts at 9.95 x 105 Hz, what is the wavelength of this radiation?

a)
6.59 x 10-28 m
b)
1.01 x 10-6 m
c)
3.32 x 10-3 m
d)
301 m
49.

A microwave oven emits radiation at a wavelength of 5.00 x 10-3 cm. What is the frequency of this radiation?

a)
6.67 x 10-7 Hz
b)
2.00 Hz
c)
1.50 x 106 Hz
d)
6.00 x 1010 Hz
50.

Calculate the frequency of a photon whose energy is 3.4 x 10-19 J?

a)

8.8 x 1026 Hz

b)

5.1 x 1014 Hz

c)

1.9 x 10-15 Hz

d)

2.3 x 10-52 Hz

51.

A common infrared laser operates at 1.06 x 103 nm. What if the energy of a photon with this wavelength?

a)

7.02 x 10-40 J

b)

6.25 x 10-28 J

c)

3.54 x 10-15 J

d)

1.87 x 10-19 J

52.

When an electron transitions from a low energy level to a high energy level, the electron ___.

a)

absorbs energy and moves away from the nucleus

b)

emits energy and moves closer to the nucleus

c)

absorbs energy and moves closer to the nucleus

d)

emits energy and moves away from the nucleus

53.

Which wave has the most energy?

a)
b)
c)
54.

Which transition would be associated with the release of electromagnetic radiation with the longest wavelength?

a)

R

b)

T

c)

U

d)

W

e)

S

55.

Which transition would be associated with the absorption of electromagnetic radiation with the lowest frequency?

a)

S

b)

T

c)

V

d)

Y

e)

X

56.

How many electrons does this magnesium ion have?

a)

24

b)

12

c)

10

d)

14

57.

Which is true about the number of subatomic particles for the species shown?

a)

17 protons and 36 neutrons

b)

17 protons and 16 electrons

c)

17 protons and 19 neutrons

d)

36 protons and 17 electrons

58.

How many neutrons are in the 108Ag?

a)

47

b)

61

c)

108

d)

155

59.

Which of the following electromagnetic radiation has the lowest energy?

a)
gamma ray
b)

infrared

c)

visible light

d)
microwave
60.

An element (X) is made up of four isotopes. Based on the abundances, you would predict the average atomic mass for this element to be?

a)

About 42 amu which is the average of all the isotope masses.

b)

Closest to Isotope D because it is the most abundant.

c)

Closest to Isotope A because it is the first isotope.

d)

The average atomic mass cannot be determined.

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