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1st Semester Chemistry I Review

Total questions: 100

Worksheet time: 1hrs 29mins

Name
Class
Date
1.

What is Avogadro's Number?

a)

6.022 x 1023

b)

1.033 x 1021

c)

5.31 x 1018

d)

9.3 x 1028

2.

A sample of gold is found to be 128 g. How many particles of gold are in the sample?

a)

3.91 x 1023

b)

4.85 x 1023

c)

8.9 x 1023

d)

1.8 x 1023

3.

What does Avogadro's Number describe in the world?

a)

the number of moles of a substance

b)

the number of particles in a mole of a substance

c)

the number of grams of a substance

d)

the number of avocados at your local supermarket

4.

How many moles of CaBr2 are in 5.0 grams of CaBr2?

a)

2.5 × 10-2 mol

b)

4.2 × 10-2 mol

c)

4.0 × 101 mol

d)

1.0 × 103 mol

5.

Who discovered electrons?

a)

Rutherford

b)

Bohr

c)

J.J. Thompson

d)

Democritus

6.

What is the correct way to write this isotope?

a)

Calcium-20

b)

Calcium-44

c)

Calcium-43.955

d)

Calcium-2.086%

7.
Rutherford's gold foil experiment provided evidence that...
a)
negative and positive charges are spread evenly throughout the atom.
b)
alpha particles have a positive charge.
c)
gold is not a dense as previously thought.
d)
there is a dense positively charged nucleus at the center of an atom.
8.

O2-

a)

oxide ion

b)

iodide ion

c)

hydroxide ion

d)

carbonate ion

9.

How many protons and electrons are present : Sr2+Sr^{2+^{ }}  

a)

Protons: 36

Electrons: 38

b)

Protons: 2

Electrons: 0

c)

Protons: 38

Electrons: 36

d)

Protons: 0

Electrons: 2

10.

Which charge is NEGATIVE?

a)

Proton

b)

Neutron

c)

Electron

d)

Cell

11.

Which charge is POSITIVE?

a)

Proton

b)

Neutron

c)

Electron

d)

Cell

12.

Which particle is NEUTRAL - NO CHARGE?

a)

Proton

b)

Neutron

c)

Electron

d)

Cell

13.

states that, regardless of the amount, a compound is always composed of the same elements in the same proportion by mass

a)

law of definite proportions

b)

law of conservation of mass

c)

law of multiple proportions

d)

periodic table

14.
Anthony is performing an experiment. He adds 0.25 grams of baking soda to 5 grams of water and stirs. Anthony watches as the baking soda dissolves in the water. If Anthony weighs the water and baking soda solution, what will its mass be?
a)
4.75 grams
b)
5.0 grams
c)
5.25 grams
d)
7.5 grams
15.
The Gold Foil experiment was done by __________.
a)
Chadwick
b)
Bohr
c)
Rutherford
d)
Thomson
16.

What experiment was used to discover electrons?

a)

Cathode Ray Tube

b)

Gold Foil

c)

Chromatography

d)

Gel Electrophorese

17.
Isotopes are atoms of the same element that have the same number of __________ but different number of __________ . Therefore, isotopes of the same element have different masses. 
a)
protons, neutrons
b)
protons, electrons
c)
neutrons, protons
d)
electrons, protons
18.

How many neutrons are in Nitrogen-15?

a)

7

b)

8

c)

15

d)

18

19.

What were John Dalton three contributions to atomic history?

a)

Created the atomic theory

b)

Discovered that the atom is mostly empty space

c)

Believed that atoms of a given element are identical

d)

Hypothesized that the atom is a tiny, hard sphere

e)

Believed that the universe was made of tiny "uncuttable" particles

20.

In oxides of nitrogen, such as N2O, NO, NO2 and N2O3, atoms combine in small whole-number ratios. This evidence supports the law of

a)

conservation of mass

b)

multiple proportions

c)

definite composition

d)

mas action

21.

What are the number of protons, electrons and neutrons, respectively for Copper-65?

(a)  

22.

What are the number of protons, electrons and neutrons, respectively for Manganese?

(a)  

23.

What are the number of protons, electrons and neutrons, respectively for Arsenic

(a)  

24.

What are the number of protons, electrons and neutrons, respectively for Yttrium?

(a)  

25.

Show your work on another piece of paper but write down your answer here also.

1. How many moles are in 7.04 grams of Cobalt?

(a)  

26.

Show your work on another piece of paper but write down your answer here also.

2. How many moles are 0.500 g BaO?

(a)  

27.

Show your work on another piece of paper but write down your answer here also.

3. Calculate the number of moles from 8.90 x 1026 atoms of Hg(C2H3O2)2



(a)  

28.

Show your work on another piece of paper but write down your answer here also.

4. Convert 7.5 x 1030 atoms of C20H28O2 to grams.

(a)  

29.

Show your work on another piece of paper but write down your answer here also.

5. How many H atoms are in 0.0086 mol isopropyl alcohol, (CH3)2CHOH

(a)  

30.

Which of the following is an extensive property of matter?

a)

melting point

b)

boiling point

c)

volume

d)

density

31.

Which of the following is an example of a heterogeneous mixture?

a)

a gold ring

b)

seawater

c)

granite

d)

sucrose

32.

Which of the following is a pure substance.

a)

air

b)

granite

c)

water

d)

salt solution

33.

Which of the following is an example of a homogeneous mixture?

a)

air

b)

fresh orange juice

c)

raw milk

d)

marble

34.

All known chemical elements are organized into groups based on similar chemical properties in the

a)

chemical table

b)

periodic table

c)

Element Table

d)

Periodic Elements

35.

Which of the following elements is a metalloid?

a)

neon

b)

selenium

c)

aluminum

d)

silicon

36.

An atom is

a)

the smallest unit of matter that maintains its chemical identity

b)

the smallest unit of a compound

c)

always made of carbon

d)

smaller than an electron

37.

A mixture is

a)

a combination of pure substances bonded chemically

b)

any substance with a uniform composition

c)

a blend of any two or more kinds of matter, as long as each maintains its own unique properties

d)

any group of elements that are chemically bonded to one another

38.

What happens to the energy in a substance when it changes state?

a)

it is destroyed

b)

it is changed into matter

c)

it changes form but is neither created nor increased

d)

The energy remains unchanged

39.

Nitrogen monoxide and oxygen, both colorless gas are mixed together and forms a red-brown gas when mixed. Nitrogen monoxide and oxygen are called

a)

products

b)

equilibria

c)

yield sign

d)

reactants

40.

A scientist is working to improve a product that uses fiber optics. This is an example of

a)

applied research

b)

basic research

c)

technological development

d)

applied and technological

41.

A state of matter in which a material has no definite shape be has a definite volume is the ________ state.

a)

gas

b)

liquid

c)

plasma

d)

solid

42.

Which process is a chemical change?

a)

heating to boiling

b)

dissolving in alcohol

c)

burning in air

d)

slicing into two pieces

43.

One way to separate the different kinds of matter is in a mixture is through

a)

filtration

b)

decomposition

c)

electrolysis

d)

chemical reactions

44.

The horizontal rows on the periodic table are called

a)

actinides

b)

families

c)

elements

d)

periods

45.

Many people are allergic to nickel, Ni, which is a cheap metal used in jewelry. Which of the following metals could be a better replacement of nickel?

a)

Chromium, Cr

b)

Zinc, Zn

c)

Aluminum

d)

Gold, Au

46.

Which element is the most reactive?

a)

Potassium

b)

Lithium

c)

Zinc

d)

Iron

47.

Which picture is the best description of a homogeneous mixture?

a)
b)
c)
d)
48.

The melting of butter is a (a)   change because it does not produce any new substances.

49.

Matter that has a definite shape and definite volume is the (a)   state.

50.

What is the name of the group that calcium is in?

(a)  

51.

Basic research is performed to increase (a)   .

52.

What is the name of the element in group 2 period 3.

(a)  

53.

What is the name of the group you can find the element Bromine in?

(a)  

54.

The particles in a (a)   state are able to slide past each other.

55.

Identify the element in period 4, group 15 as a metal, nonmetal or metalloid.

(a)  

56.

In a bonfire, ashes are produced when oxygen allows wood to combust. In this process, ashes are the reactants or products.

(a)  

57.

The symbol for Carbon is

(a)  

58.

Mixing two liquids together and a solid is formed is called a(n)

(a)  

59.

The weight of an object is an example of intensive, extensive, physical or chemical property

(a)  

60.

What type of change has occurred to the metal on this bridge?

(a)  

61.

Which of following is a pure substance, concrete, sweet tea, or salt?

(a)  

62.
How many sig. fig. are in the number below:
350.540
a)
4
b)
5
c)
6
d)
7
63.
How many sig. fig. are in the number below:
0.0005
a)
1
b)
2
c)
3
d)
4
64.
Which measurement contains 3 sig figs?
a)
200 mL
b)
20.0 mL
c)
0.02 mL
d)
0.020mL
65.
Round 1047.78 to three sig figs
a)
104
b)
105
c)
1050
d)
1050.00
66.
Describe the accuracy and precision of the image
a)
Accurate and Precise
b)
Accurate and not precise
c)
Not Accurate and Precise
d)
not accurate and not precise
67.
How many sig figs are in 0.0045670?
a)
8
b)
4
c)
5
d)
7
68.
Describe the accuracy and precision of the image
a)
Accurate and Precise
b)
Accurate and not precise
c)
Not Accurate and Precise
d)
not accurate and not precise
69.
How many significant figures does the following number have: 1740200
a)
2
b)
1
c)
3
d)
5
70.

Which is the more precise measurement?

a)

4 mL

b)

4.3 mL

c)

4.30 mL

d)

4.300 mL

71.
How many sig figs are in 927.0020?
a)
4
b)
3
c)
6
d)
7
72.

The students measured length during a science experiement, they got 12.00 cm. But the actual measurement was 14.25 cm. What was the percent error?

a)

15.79%

b)

18.75%

c)

2.25%

d)

18%

73.
Describe the accuracy and precision of the image
a)
Accurate and Precise
b)
Accurate and not precise
c)
Not Accurate and Precise
d)
not accurate and not precise
74.
How many significant figures does the following number have: 100.3
a)
4
b)
3
c)
5
d)
2
75.

Solve & Round to Correct Sig Figs. 4.5 + 4.35 = 

a)

8.8

b)

8.7

c)

8

d)

8.9

76.
Solve & Round to Correct Sig Figs.
4.5 x 2.34 = 
a)
11
b)
10.52
c)
10.5
d)
10
77.
Solve. Round using SigFig math rules.
12.5-mL + 20.05-mL + 2.69-mL
a)
35-mL
b)
35.2-mL
c)
35.24-mL
d)
35.240-mL
78.
Find the sum 3.35 + 1.4 + 3.65
a)
8.9
b)
8.22
c)
8.43
d)
8.4
79.

Find the sum 3.85 + 10. + 3.65

a)

17

b)

17.5

c)

18

d)

18.0

80.

Solve & Round to Correct Sig Figs. 4.5 x104 x 2.34 = 

a)

1.0 x 105

b)

105 300

c)

105 000

d)

1.1 x 105

81.

Solve and round the the correct number of sig figs:

4.5 x 2.34 =

a)

11

b)

10.52

c)

10.5

d)

10

82.

Solve and round the the correct number of sig figs:

3.50 / 4.2431 =

a)

0.8248686102

b)

0.825

c)

0.82487

d)

0.824

83.
Calculate 1.23 m x 0.89 m and give your answer with the appropriate number of significant figures.
a)
1.0 m2
b)
1.1 m2
c)
1.0947 m2
d)
1.09 m2
84.
Solve the problem below, and choose the answer with the correct number of significant figures and the correct units.
10.0g/mL  x 5.0mL  =  ???
a)
50g
b)
50.0g
c)
50.g
d)
50g/mL
85.
Solve the problem below, and choose the answer with the correct number of significant figures and the correct units.
6.20x104g  +  2.05x103g  =  ???
a)
64,050g
b)
6.40x104g
c)
6.41x104g
d)
6.405x104g
86.
How many sig figs are there?
4000.
a)
1
b)
3
c)
4
87.
What is the measurement 1042 Liters rounded to 2 significant figures? 
a)
1040 L
b)
1.1 x 103 L
c)
1.0 x 103 L
d)
1050 L
88.

Put 2.50 x 10-2 in the expanded form

a)

250

b)

250.

c)

0.025

d)

0.0250

89.

Put 7.25 x 103 in the expanded form

a)

0.00725

b)

0.000725

c)

7 250

d)

725 000

90.

Which set of properties, intensive or extensive, are based on the size of a sample?

a)

intensive

b)

extensive

91.

What kind of physical property is this? Number of Atoms

a)

intensive

b)

extensive

92.

What kind of physical property is this? Density

a)

intensive

b)

extensive

93.

What kind of physical property is this? Length

a)

intensive

b)

extensive

94.

Which of these are extensive properties of matter?

a)

Mass

b)

Volume

c)

Density

d)

Freezing Point

e)

Size

95.

These kind of observation use your senses to observe results.

a)

qualitative

b)

quantitative

96.

These kind of observations are made using instruments such as rulers, balances and thermometers.

a)

qualitative

b)

quantitative

97.

The temperature of the room is decreasing by 4 degrees Celsius.

a)

qualitative

b)

quantitative

98.

The rose is red. This is an example of a

a)

extensive property

b)

Chemical property

c)

intensive property

d)

physical change

99.

The density of pyrite is 5g/cm3 . This is an example of

a)

intensive property

b)

extensive property

c)

chemical change

d)

chemical property

100.

What kind of physical property is this? Ductility

a)

intensive

b)

extensive

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