wayground logo

Free Printable Worksheets

Font size

S
M
L
XL
Worksheets

Moc exam -CA 1- T2

Total questions: 80

Worksheet time: 2hrs 2mins

Name
Class
Date
1.

Students worked in teams to measure the length of an object. The actual length of the object was 7.0 cm.. Select the best choice that represents their data in terms of accuracy and precision

GROUP RESULTS

5.00 cm

5.01 cm

5.02cm

4.99 cm

5.00 cm

4.99 cm

a)

both accurate and precise

b)

only accurate

c)

only precise

d)

not accurate and not precise

2.

A zero percent error in a lab is accomplished by__

a)

having a really good measuring device

b)

making sure all the steps in a procedure are being followed

c)

getting the exact result as the expected result in a lab

d)

rounding numbers to zero

3.

An irregularly-shaped sample of aluminum (Al) is put on a balance and found to have a mass of 43.6 g. The student decides to use the water-displacement method to find the volume. The initial volume reading is 25.5 mL and, after the Al sample is added, the water level has risen to 41.7 mL. Find the density of the Al sample in g/L.

a)

1.7 g/mL

b)

1.05 g/mL

c)

0.65 g/mL

d)

2.70 g/mL

4.

What is the length of the blue line?

a)

.3 cm

b)

.33 cm

c)

.03 cm

d)

3.219 cm

5.

Which Student is the most Precise?

a)

Student A

b)

Student B

c)

Student C

d)

Students C and A

6.

Mark all that apply.

In the following data, which digits are certain (known)?

7.38 g/mL

a)

7

b)

3

c)

8

d)

all the decimal places to the right of the 8

e)

g/mL

7.

Which Student is the most Accurate?

a)

Student A

b)

Student B

c)

Student C

d)

Students B and C

8.

Mark all that apply.
If the actual density of zinc is 7.134g/mL, what can be said about John's data?

a)

good precision

b)

poor precision

c)

good accuracy

d)

poor accuracy

9.

Mark all that apply.
If the actual density of zinc is 7.134g/mL, what can be said about Sam's data?

a)

good precision

b)

poor precision

c)

good accuracy

d)

poor accuracy

10.

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

a)

good precision

b)

poor precision

c)

good accuracy

d)

poor accuracy

11.

If the actual density of zinc is 7.134g/mL, whose data was the most accurate?

a)

John's

b)

Sam's

c)

Sara's

d)

Table's

e)

Density

12.

Which is a finding attributed to Rutherford's Gold Foil Experiment?

a)

atoms are indivisible and have a dense positive nucleus.

b)

atoms are divisible and have multiple layers of electrons scattered uniformly about the atom.

c)

atoms are like plum pudding with positive and negative charges uniformly scattered throughout the atom.

d)

atoms are mostly empty space with a dense positive nucleus.

13.

What evidence did Rutherford use to support the idea that the atom was mostly empty space?

a)

the vast majority of the alpha particles went through the foil unaffected.

b)

the vast majority of the alpha particles were deflected at 90 degrees.

c)

one alpha particle was deflected by the gold foil.

d)

beams of alpha particles were deflected by magnets.

14.

Choose the correct description of J. J. Thomson's Model of an Atom.

a)

The model is a indivisible and indestructible sphere

b)

The model is a sphere in which negatively charged particles - electrons- immersed in a positively charged space of the sphere.

c)

The model is a sphere in which negatively charged particles - electrons- move around the center of an atom creating an electron cloud

d)

The model is a sphere in which negatively charged particles - electrons - move around the nucleus of an atom in a defined passes, called orbits, like planets around the sun

15.

Which diagram best illustrates the atomic model that Rutherford derived from his gold foil experiment?

a)
b)
c)
d)
16.
J.J. Thomson provided evidence that an atom...
a)
is the smallest particle of matter
b)
contains negatively charged particles
c)
has an overall negative charge
d)
has an overall positive charge
17.
What contribution did John Dalton make to atomic theory? 
a)
He discovered that every atom was positively charged. 
b)
He discovered that every element consisted of one type of atom.  
c)
He discovered that atoms had nuclei. 
d)
He discovered that atoms could be divided into smaller parts. 
18.
J.J. Thomson provided evidence that an atom...
a)
is the smallest particle of matter
b)
contains negatively charged particles
c)
has an overall negative charge
d)
has an overall positive charge
19.

What is the ratio of C:O in CO2?

a)

4:8

b)

3:7

c)

8:4

d)

2:4

20.

A pure sample of ammonia contains 14 g of nitrogen and 3 grams of hydrogen. A second sample of pure ammonia contains 28 g nitrogen and X g of hydrogen. The mass (x) of hydrogen gas is

a)

6 g

b)

14 g

c)

17 g

d)

25 g

21.

The figure shows the Law of multiple proportion

a)

True

b)

False

22.

The missing ratio in the table os 2:1

a)

True

b)

False

23.
Which of the following would have more mass?
a)
1 mole of Li
b)
1 mole of Au
c)
1 mole of Si
d)
None, all are equal
24.

How many molecules are there in 31.8 moles of water? (H2O has a molar mass of 18.0 g/mol)

a)

572 g

b)

1.91 x 1025 molecules

c)

5.28x 10-25 molecules

d)

1.77 g

25.

Vitamin C, also known as ascorbic acid, is water soluble and cannot be produced by the human body. Each day, a person's diet should include a source of Vitamin C, such as orange juice. Ascorbic acid has a molecular formula of C6H8O6 and a molar mass of 176 grams per mole.

Determine the number of moles of vitamin C in an orange that contains 0.171 grams of vitamin C.

a)

30.1 moles

b)

1030 moles

c)

.000971 moles

d)

.0001 mole

26.

Calculate the number of moles in 55g of copper chloride (CuCl₂)

a)

0.41 moles

b)

0.82 moles

c)

1.6 moles

d)

.20 moles

27.
Which has more molecules?
a)
1 mole H2O
b)
1 mole Al(OH)3
c)
1 mole NaCl
d)
There are all the same
28.

How many molecules are present in 135 g of Teflon C2F4

a)

6.13 x 1023 molecules

b)

5.13 x 1023 molecules

c)

8.13 x 10 23 molecules

d)

9.13 x 1023 molecules

29.
Which of the following would have the highest number of moles?
a)
4g CO2
b)
15g H2O
c)
22g NaCl
d)
100g AgCl
30.

What is the molar mass of calcium hydroxide, Ca(OH)2?

a)

74.1 g/mole

b)

57.1 g/mole

c)

58.1 g/mole

d)

57.1 u

31.
How many particles are in 13.5 grams of Beryllium?
a)
1.5 particles
b)
9 particles
c)
4x1023 particles
d)
9x1023 particles
32.
Calculate the number of moles of Aluminum in a 2.04 mole sample of aluminum oxide, Al2O3.
a)
2.04 moles
b)
4.08 moles
c)
6.12 moles
d)
1.02 moles
33.

What is the mass of 0.75 moles of (NH4)3PO4?

a)

0.0044 g

b)

91 g

c)

110 g

d)

74 g

34.

What type of atom is this?

a)

Neutral atom

b)

Cation

c)

Anion

d)

Isotope

35.

How many electrons does this magnesium ion have?

a)

24

b)

12

c)

10

d)

14

36.

What is the representation of an isotope?

a)

N-3

b)

Al+3

c)

Si

d)

P-33

37.

How many neutrons does this Neon atom have?

a)

21

b)

11

c)

10

d)

12

38.

What does it happen to this atom?

a)

It LOSES electrons

b)

It GAINS electrons

c)

It GAINS protons

d)

It LOSES protons

39.

What is the atomic number of this element?

a)

12

b)

24

c)

23

40.
Which atom has  4 neutrons?
a)
Li-6
b)
Li-7
c)
Li-8
d)
they have the same # of neutrons
41.

Atoms of the same element with a different number of electrons are called ___________.

a)

elements

b)

isotopes

c)

ions

d)

neutral

42.

How many neutrons are in the following atom?

a)

47

b)

61

c)

108

d)

155

43.

How many electrons does the following ion have?

a)

10

b)

12

c)

14

d)

22

44.

How many electrons does the following ion have?

a)

3

b)

7

c)

10

d)

14

45.

Which of the following describes a negative ion?

a)

8 protons, 8 neutrons, 8 electrons

b)

8 protons, 8 neutrons, 10 electrons

c)

8 protons, 10 neutrons, 8 electrons

d)

8 protons, 8 neutrons, 6 electrons

46.

Which is true of the following beryllium atom?

a)

4 protons and 9 neutrons

b)

5 neutrons and 4 electrons

c)

9 protons and 4 neutrons

d)

4 protons and 2 electrons

47.

Which is true about the following chlorine atom?

a)

17 protons and 36 neutrons

b)

17 protons and 19 electrons

c)

17 protons and 19 neutrons

d)

36 protons and 17 neutrons

48.
What do these isotopes of carbon all have in common?
a)
neutrons & mass number
b)
atomic number and neutrons
c)
atomic number and electrons
d)
protons, atomic number, and mass number
49.
Isotopes are atoms of the same element with different #’s of __________ & therefore different __________.
a)
n0 ;  atomic #’s
b)
p+ ; atomic #’s
c)
e- ; atomic masses
d)
n0 ; atomic masses
50.
If X is the symbol for an element, which of the following two symbols represent    isotopes of the same element?     I. 7735X  II. 7733X  III. 8137X  IV. 8135 X
a)
I and II
b)
III and IV
c)
I and IV
d)
I and III
51.
Four isotopes of lead include lead-204, lead-206, lead-207, and lead-208.  The average atomic mass of lead is 207.2.  Which isotope of lead is likely to be the most abundant.
a)
204
b)
206
c)
207
d)
208
52.

76 protons and 114 neutrons

a)

Osmium-114

b)

Osmium-76

c)

Osmium-190

d)

Osmium-190.23

53.
The element, antimony (Sb) has two major isotopes of similar abundances, both around 50%.  The atomic mass of antimony is reported on the periodic table as 121.76.  Choose the most likely set of mass numbers for these two antimony isotopes.
a)
Antimony-121 and Antimony-123
b)
Antimony-120 and Antimony-127
c)
Antimony-123 and Antimony 122
d)
Antimony-121 and Antimony-118
54.
24.1% of all the isotopes of a an element have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu.
What is the average mass of this element?
a)
74.92 amu
b)
24.97 amu
c)
75.01 amu
d)
74.51 amu
55.
An element has two naturally occurring isotopes. One is 10.013 amu and is 19.9% abundant. The other is 11.01 amu and is 80.1% abundant. What is the average atomic mass? What element is it?
a)
9.012, Beryllium
b)
12.011, Carbon
c)
6.941, Lithium
d)
10.812, Boron
56.

The atomic mass of an element is the ___.

a)

average of the mass number and the atomic number for the element

b)

weighted average of the masses of the isotopes of the element

c)

total mass of the isotopes of the element

d)

total number of subatomic particles in the nucleus

57.

Calculate the average atomic mass of the element iron (Fe) using the following data:

[Isotope / % abundance]

[Iron 54 / 6% ] [Iron 56 / 92% ] [ Iron 57 / 2% ]

a)

53.7 amu

b)

54.9 amu

c)

5592.0 amu

d)

55.9 amu

58.
Compute the average atomic mass for silicon:
a)
27.977
b)
28.09
c)
28.976
d)
The average mass cannot be determined from provided information.
59.
Atom 1 has Mass=12  Protons=6
Atom 2 has Mass= 14 Electrons=6
Are these atoms isotopes of each other or different elements?
a)
Different Elements - Mg & Si
b)
Different Elements - Ar & Ca
c)
Isotopes of Carbon
d)
Isotopes of Magnesium
60.

Determine the percent abundance for Fe-57, given the following above. The average atomic mass for Fe is 55.845 u.

a)

2.13

b)

0.27

c)

2.70

d)

0.21

61.
How many isotopes are shown in this mass spectrum?
a)
1
b)
84
c)
86
d)
4
62.

What is the average atomic mass for this element?

a)

10 amu

b)

10.2 amu

c)

19.9 amu

d)

11 amu

63.
Copper consists of 2 isotopes 63Cu and 65Cu and has a relative atomic mass of 63.55. What is the most likely composition. 
63Cu                             65Cu
a)
30%    70%
b)
50%    50%
c)
55%    45%
d)
70%   30%
64.
Which element does this mass spectrum most likely represent?
a)
neon
b)
scandium
c)
boron
d)
sodium
65.
What do you expect the molar mass to be for this element?
a)
91.4 g/mol
b)
90.0 g/mol
c)
4 g/mol
d)
50. g/mol
66.
A sample of pure chlorine gas is analyzed in the MS. Which of the following is a correct interpretation?
a)
Chlorine has an isotope with a mass of 70 amu
b)
Chlorine has three known isotopes
c)
Chlorine is diatomic
d)
Chlorine is highly reactive
67.
Based on the mass spectrum, which isotope of chlorine is most abundant?
a)
35Cl
b)
37Cl
c)
70Cl
d)
72Cl
68.
What is the average atomic mass for this element?
a)
10 amu
b)
10.8 amu
c)
19.9 amu
d)
11 amu
69.
The average atomic mass rhenium, Re, is 186.21 amu. If 37.1% of rhenium has mass# = 185, what is the other stable isotope?
a)
Rhenium-183
b)
Rhenium-181
c)
Rhenium-187
d)
Rhenium-189
70.
How would you write 0.0005 in scientific notation?
a)
50 x 105
b)
5 x 104
c)
5 x 103
d)
.5 x 103
71.
How do you write
1001
in scientific notation?
a)
1.0001 x 104
b)
1.01 x 105
c)
1.001 x 103
d)
10.1 x 103
72.
(2 x 109)(4 x 10-4)
a)
8 x 1013
b)
8 x 1036
c)
8 x 105
d)
8 x 10-36
73.
Solve:
(2.1×10​2​​) × (3.0×10​4)
a)
5.1 x 102
b)
6.3 x 106
c)
5.1 x 106
d)
6.3 x 108
74.
(2.13 * 104) / (7.1 * 102)
a)
0.3 * 102
b)
3 * 106
c)
3 * 102
d)
3 * 10
75.
How many significant figures: 100.000 cL
a)
1
b)
3
c)
5
d)
6
76.
Calculate 5.50 cm + 5.5 cm and give your answer with the correct number of significant figures.
a)
11 cm
b)
11.0 cm
c)
11.00 cm
d)
11.000 cm
77.
Calculate 12.34 + 1.234 + 0.1234 and give your answer with the correct number of significant figures.
a)
13.6974
b)
13.697
c)
13.70
d)
13.7
78.
Calculate 345.009 g - 23.00 g and give your answer with the correct number of significant figures.
a)
322.01 g
b)
322 g
c)
322.009 g
d)
322.0
79.
Calculate 1.23 m x 0.89 m and give your answer with the correct number of significant figures.
a)
1.0 m2
b)
1.1 m2
c)
1.0947 m2
d)
1.095 m2
80.
Calculate 923 g ÷ 20312 cm3 and give your answer with the correct number of significant figures.
a)
0.04 g/cm3
b)
0.045 g/cm3
c)
0.0454 g/cm3
d)
0.05 g/cm3

Similar Resources on Wayground

Final Review

80 questions

Final Review

quiz

Worksheet

•

KG - University

Jadual Berkala Unsur

80 questions

Jadual Berkala Unsur

quiz

Worksheet

•

4th Grade - University

Electricity and Circuits

75 questions

Electricity and Circuits

quiz

Worksheet

•

1st Grade - University