Deck 1: Introduction to Chemistry

Question 1

A glass of tea with a uniform composition throughout would be an example of a(n) ____.

A) pure substance
B) element
C) compound
D) homogeneous mixture
E) heterogeneous mixture

Answer 1

homogeneous mixture

Question 2

Which of the following is a heterogeneous mixture?

A) salt water
B) salt
C) milk
D) sand
E) water

Answer 2

sand

Question 3

Which of the following is not a chemical change?

A) developing a film
B) refrigerating milk
C) eating beef
D) extinguishing a fire
E) frying an egg

Answer 3

refrigerating milk

Question 4

Which of the following is correctly classified as a hypothesis?

A) "The sun will rise in the East today."
B) "Global warming is a result of the increased carbon dioxide concentration in the atmosphere."
C) "Our team is better than theirs."
D) "Cookies will turn brown when baked."
E) "My book is better than yours."

Question 5

Which form of substances listed below cannot be separated into simpler substances by chemical or physical means?

A) an element
B) a compound
C) a heterogeneous mixture
D) a homogeneous mixture
E) All substances can be separated into simpler substances.

Question 6

Which of the following represents a chemical change ?

A) Cutting a string into two pieces.
B) Melting candle wax.
C) Evaporation of water from a lake.
D) Rusting of an iron nail.
E) Peeling an apple.

Question 7

All of the following are properties of Magnesium. Which would be considered a chemical property of magnesium?
I. Magnesium burns in air to produce a white substance known as magnesium oxide.
II. Magnesium dissolves in acidic water to produce hydrogen gas.
III. The density of magnesium is 1.738 g/mL.

A) I
B) II
C) III
D) I and II
E) all of these

Question 8

Which does not represent a scientific investigation?

A) Weighing the results of an experiment to obtain quantitative data.
B) Weighing lab reports on a chemical balance to determine the grade.
C) Graphing the mass of a product as a function of the mass of the starting material.
D) Determining the temperature at which the maximal amount of product is obtained.
E) Trying different conditions if an initial experiment fails.

Question 9

Which of the following is not a physical change?

A) ice melting
B) dry ice subliming
C) a light-bulb glowing
D) beef cooking
E) distilling alcohol

Question 10

Which of the following would be considered a chemical change ?
I. Frost forms on the window
II. A Silver fork tarnishes
III. Toasting a slice of bread.

A) I only
B) I and II
C) I and III
D) II and III
E) All of these

Question 11

All of the following are properties of carbon dioxide, CO₂. Which of the following is a chemical property of this substance?

A) It reacts with water to form carbonic acid.
B) It is a colorless gas at room temperature and 1 atm pressure.
C) It is a solid below - 78 ° C.
D) Its density as a solid equals 1.35 g/mL.
E) None of these is a chemical property.

Question 12

Which of the following studies is not considered to be "Chemistry?"

A) Studying the interactions between energy and matter.
B) Classifying elements into metallic, nonmetallic or semimetallic.
C) Studying the interactions between matter and other matter
D) Removing harmful impurities from a synthetic drug.
E) Separating the light spectrum into its component colors.

Question 13

Of the three properties listed below, which ones are intensive properties?
I. mass
II. density
III. color

A) I and II
B) II and III
C) II only
D) I only
E) I, II, and III

Question 14

Which of the following is considered a chemical change ?

A) Beef is browned by heating in a skillet.
B) A blackberry changes colors from red to black.
C) Addition of hydrogen peroxide to an open cut produces a white liquid and fizzing.
D) a and b
E) all of these.

Question 15

"A 33 g sample of red liquid at its freezing point of 260 K had a density of 0.926 g/mL." Which of the properties given in the previous statement is extensive ?

A) 33 g
B) red
C) freezing point
D) 260 K
E) 0.926 g/mL

Question 16

Which of the following would be considered a physical change ?

A) gasoline burning
B) salt dissolving in water
C) food spoiling
D) iron rusting
E) a battery discharging

Question 17

The following are properties of sodium metal. Which would be considered a chemical property of sodium metal?

A) Sodium is a silvery-white metal
B) Sodium has a melting point of 98 ° C
C) Sodium has a density equal to 0.968 g/mL.
D) Sodium reacts with water violently to produce hydrogen gas.
E) Sodium metal is drawn into a magnetic field.

Question 18

How can "oil and vinegar" be classified?
(Two phases are present.)

A) pure substance
B) element
C) compound
D) homogeneous mixture
E) heterogeneous mixture

Question 19

Which of the following processes is considered a chemical change ?
I. Corrosion of aluminum metal
II. Digesting a candy bar.
III. Melting of ice.

A) I only
B) II only
C) III only
D) I and II
E) All of these

Question 20

Identify the matter that is correctly classified as a mixture.

A) ethyl alcohol
B) carbon dioxide
C) water
D) tin
E) air

Question 21

A compound is:

A) a pure substance that can be decomposed chemically.
B) a characteristic that describes a substance.
C) a pure substance that cannot be decomposed chemically.
D) a combination of atoms.
E) none of these.

Question 22

Which of the following is an example of a homogeneous mixture ?
I. Water and dissolved salt
II. Water and sand
III. Carbonated water (soda) and ice

A) I only
B) II only
C) III only
D) I and II
E) All of these

Question 23

Which of the following best describes an element?

A) An element is a mixture that can be separated into simpler substances using physical methods .
B) An element is a mixture that can be separated into simpler substances using chemical methods .
C) An element is a pure substance that can be separated into simpler substances using physical methods .
D) An element is a pure substance that can be separated into simpler substances using chemical methods .
E) An element is a pure substance that cannot be separated into simpler substances using ordinary physical or chemical methods.

Question 24

Which of the following volume measurements is the least precise measurement?

A) 1.0 mL
B) 2.018 mL
C) 2.02 mL
D) 2.022 mL
E) 3 mL

Question 25

Which of the following matched pairs of elemental names and chemical symbols is properly labeled?
I. Calcium, C
II. Plutonium, Pt
III. Silicon, Si
IV. Iron, I
V. Nitrogen, N

A) I, IV and V
B) II, III and V
C) I, III, IV and V
D) III and V
E) All are properly labeled

Question 26

Three students measured the density of pure water in the laboratory. Their results are as follows:
Student 1:
Density = 1.20 g/mL Student 2:
Density = 1.21 g/mL Student 3:
Density = 1.19 g/mL The actual density of water at 25 ° C equals 0.997 g/mL. What do the results of these three experiments demonstrate when compared to the true density of water?

A) High accuracy and high precision
B) High accuracy and low precision
C) Low accuracy and high precision
D) Low accuracy and low precision
E) None of these

Question 27

A precise measurement

A) is known to two or more significant figures.
B) is known to two or more decimal places.
C) is repeatable.
D) is close to the correct answer
E) is beyond the scope of a first-year chemistry student.

Question 28

What is the chemical symbol for the element tin ?

A) T
B) Sn
C) Ti
D) Tn
E) St

Question 29

In the reported measurement of 24.0 mm, what digit is uncertain ?

A) tens place
B) in the ones place
C) in the tenths place
D) in the hundredths place
E) All places are reported with certainty.

Question 30

Three students measured the freezing temperature of water in the laboratory. Their results are as follows:
Student 1:
Freezing temperature = 2.86 ° C Student 2:
Freezing temperature = - 4.52 ° C Student 3:
Freezing temperature = 3.21 ° C The actual freezing temperature of water equals 0.00 ° C. The results of these three students when compared to the true freezing temperature of water demonstrates:

A) High accuracy and high precision
B) High accuracy and low precision
C) Low accuracy and high precision
D) low accuracy and low precision
E) None of these

Question 31

Which of the following best describes a mixture ?

A) It's composition can vary but its properties remain constant .
B) It's composition and properties can vary .
C) It's composition remains constant but its properties varies .
D) It's composition and properties remains constant .

Question 32

What length in millimeters can be reported for the rectangle below?
(Note that the ruler measures in centimeters.)

A) 24 mm
B) 24.0 mm
C) 2.4 mm
D) 2.40 mm
E) 240 mm

Question 33

The definition "stable pure substance that cannot be separated into simpler substances by chemical means" would best fit which term listed below?

A) element
B) compound
C) atom
D) molecule
E) xanon

Question 34

Which of the following measurements is considered a combination of one of the seven base units from which all other measurements can be made?

A) mass
B) volume
C) amount
D) temperature
E) time

Question 35

Which of the following matched pairs of elemental names and chemical symbols is properly labeled?
I. Magnesium, Mg
II. Mercury, M
III. Silver, Si
IV. Sodium, S
V. Oxygen, O

A) I only
B) II and III
C) I and V
D) I, IV and V
E) All are properly labeled

Question 36

The elements Carbon, Lead, and Magnesium are designated by what chemical symbols respectively?

A) C, L, M
B) Ca, Le, Ma
C) C, Pb, Mn
D) C, Pb, Mg
E) Ca, Pb, Mn

Question 37

Which is properly classified as a compound?

A) salt water
B) salt
C) wine
D) bread
E) copper

Question 38

An accurate measurement

A) is known to two or more significant figures.
B) is known to two or more decimal places.
C) is repeatable.
D) is close to the correct answer
E) is beyond the scope of a first year chemistry student.

Question 39

Which of the following is not an element?

A) niobium
B) thallium
C) silicon
D) sodium
E) ammonium

Question 40

Which of the following best describes a compound ?

A) A compound is a mixture that can be separated into its constituent elements using physical methods .
B) A compound is a mixture that can be separated into its constituent elements using chemical methods .
C) A compound is a pure substance that can be separated into its constituent elements using physical methods .
D) A compound is a pure substance that can be separated into its constituent elements using chemical methods .

Question 41

What prefix is used to indicate a base unit multiplied by 10 ^{- 6}?

A) kilo
B) mega
C) micro
D) centi
E) deca

Question 42

Two students combined two different volumes of water. The first student measured 25.4 mL of water using a 100.0 mL graduated cylinder and the second student measured 0.15 mL of water using a 50.00 mL burette. What total volume should be reported after taking into account significant digits and the convention used for rounding?

A) 25 mL
B) 25.5 mL
C) 25.55 mL
D) 25.6 mL
E) 26 mL

Question 43

How would the measurement, 5125 m, be rounded off to three significant digits and expressed in scientific notation ?

A) 5.12×10 ^{- 3} m
B) 5.13×10 ^{- 3} m
C) 5.130×10 ^{- 3} m
D) 5.12×10³ m
E) 5.13×10⁴ m

Question 44

Which metric prefix listed below has a power of 10 ^{- 12} associated with it?

A) centi
B) micro
C) milli
D) kilo
E) pico

Question 45

Three problems are worked below. Choose the answer that properly describes the correct use of significant digits
I. 0.34
II. 14.3
III. 14.21 +14.2×2.0×134 14.5 28.6 1.90×10³

A) I and II are correct, III is incorrect
B) I and III are correct, II is incorrect
C) II and III are correct, I is incorrect
D) all three are correct
E) none of these

Question 46

The number 0.00042 is equal to:

A) 4.2×10⁴
B) 4.2×10 ^{- 4}
C) 4.2×10³
D) 4.2×10 ^{- 3}
E) 4.2×10 ^{- 2}

Question 47

What digit(s) is(are) considered the digit of uncertainty in the following measurement?

A) thousandths place
B) ones, hundredths, ten thousandths and hundred thousandths places
C) ten thousandths place
D) hundred thousandths place
E) millionth place

Question 48

Which is an abbreviation for an SI base unit?

A) J
B) kg
C) Nt
D) ° C
E) L

Question 49

Which measurements below have four significant digits?
Measurement
I. 0.023 mL
II. 2300 mL
III. 1700 . mL
IV. 0.004050 mL

A) all of these have four significant digits
B) I, II and III
C) II, III, and IV
D) I and II
E) III and IV

Question 50

The dimensions of the following cube were measured. What would be the volume of this cube expressed to the proper number of significant digits?
(Volume = l w d )

A) 29.127861 cm³
B) 29.13 cm³
C) 29.1 cm³
D) 29. cm³
E) 30 cm³

Question 51

What prefix is used to indicate a base unit multiplied by 10 ^{- 1}?

A) deca
B) centi
C) milli
D) deci
E) micro

Question 52

Choose the best answer to the following math problem ( with the proper number of significant digits and rounded correctly ). (12.3432 - 8.84)×22.48 = ??

A) 78.751936
B) 78.75
C) 78.76
D) 78.8
E) 78.752

Question 53

What is the density of mercury when reported to the proper number of significant digits and in scientific notation if a sample is found to have a mass of 524.5 g and occupies a volume of 38.72 ml?

A) 7.38×10 ^{- 2} g/mL
B) 7.382×10 ^{- 2} g/mL
C) 1.35×10¹ g/mL
D) 1.354×10¹ g/mL
E) 1.355×10¹ g/mL

Question 54

How many significant digits are there in 0.0050 mL?

A) 1
B) 2
C) 3
D) 4
E) 5

Question 55

The correct answer for (1.22×10³)×0.013 is:

A) 15.8
B) 158
C) 16
D) 15.86
E) 93846

Question 56

Which metric prefix(es) listed below is(are) correctly assigned the proper power of ten?
I. giga:
10⁹
II. micro:
10⁶
III. nano:
10 ^{- 12}

A) I only
B) II only
C) III only
D) I and II
E) II and III

Question 57

The number 486,000 is equal to:

A) 4.86×10²
B) 4.86×10 ^{- 4}
C) 4.86×10³
D) 4.86×10⁴
E) 4.86×10⁵

Question 58

What is the temperature given by the thermometer below written with the proper number of significant digits?

A) 32.3 ° C
B) 32.30 ° C
C) 32 ° C
D) 32.300 ° C
E) 30 ° C

Question 59

Which metric prefix(es) listed below is(are) correctly assigned the proper power of ten?
I. deci:
10¹
II. nano:
10 ^{- 6}
III. mega:
10⁶

A) I only
B) II only
C) III only
D) I and II
E) All of these

Question 60

Properly expressed, the answer to the mathematical manipulation (0.243×4.2) + 21 = is:

A) 22
B) 22.0
C) 2.2×10²
D) 22.02
E) 2.202×10²

Question 61

A carpenter must lay a floor that covers 1500 ft². What is this area in cm²?
(1 foot = 12 inches and 1 inch = 2.54 cm)

A) 1.6 cm²
B) 49 cm²
C) 3.2×10² cm²
D) 4.6×10⁴ cm²
E) 1.4×10⁶ cm²

Question 62

A person weighs 83.2 kg. What is this person's weight in pounds?
(1)00 pound = 454 grams)

A) 0.183 pounds
B) 5.46 pounds
C) 37.8 pounds
D) 183 pounds
E) 3.78×10⁷ pounds

Question 63

The speed limit on the interstate in Virginia is 65 miles per hour. What is this speed in kilometers per second?
(1 km = 0.621 miles, 1 hour = 60 minutes and 1 minute = 60 seconds)

A) 0.029 km/sec
B) 34. km/sec
C) 40. km/sec
D) 55. km/sec
E) 1.0×10² km/sec

Question 64

How many nanometers are present in 4.5 cm?

A) 4.5×10 ^{- 9} nm
B) 4.5×10 ^{- 7} nm
C) 4.5×10⁶ nm
D) 4.5×10⁷ nm
E) 4.5×10¹¹ nm

Question 65

How many micrometers, m m, are present in 0.575 mm?

A) 5.75×10 ^{- 10} m m
B) 5.75×10 ^{- 4} m m
C) 5.75×10¹ m m
D) 5.75×10² m m
E) 5.75×10⁸ m m

Question 66

A car travels 28.0 miles per gallon of gasoline. How many kilometers per liter will it go?
(1 mile = 1.6093 km and 1 gallon = 3.7854 L)

A) 5.86×10 ^{- 3} km/L
B) 4.60 km/L
C) 11.9 km/L
D) 65.9 km/L
E) 170 km/L

Question 67

The speed of light in a vacuum is 2.998×10⁸ m/s. What is this speed given in cm/min?

A) 1.799×10¹³ cm/min
B) 1.799×10¹² cm/min
C) 4.997×10⁸ cm/min
D) 1.799×10⁸ cm/min
E) 4.997×10⁴ cm/min

Question 68

Express a mass of 0.0220 kg in grams.

A) 22.0 g
B) 2.20×10 ^{- 5} g
C) 2.20×10 ^{- 3} g
D) 4.84×10 ^{- 2} g
E) 0.0100 g

Question 69

How many gallons are present in 43.7 Liters?
(1 gallon = 4 quarts and 1 quart = 0.946 L)

A) 10.3 gallons
B) 11.5 gallons
C) 46.2 gallons
D) 165 gallons
E) 185 gallons

Question 70

An object measures 1.92 meters in length. What is this object's length in feet?
(1 inch = 2.54 cm)

A) 9.07×10 ^{- 2} ft
B) 5.85×10 ^{- 1} ft
C) 6.30 ft
D) 4.06×10¹ ft
E) 9.07×10² ft

Question 71

The area of a US quarter is approximately 4.5×10² mm². What is the area of a US quarter in square inches, (in²)?
(1 in = 2.54 cm)

A) 7.0×10 ^{- 1} in²
B) 1.8×10¹ in²
C) 2.9×10⁵ in²
D) 1.8×10 ^{- 1} in²
E) 1.1×10⁴ in²

Question 72

The smallest bone in the human body, which is in the ear, has a mass of 0.0030 grams. What is this mass in pounds?
(1 pound = 454 grams)

A) 6.6×10 ^{- 6} pounds
B) 3.0×10 ^{- 3} pounds
C) 0.73 pounds
D) 1.4 pounds
E) 1.5×10⁵ pounds

Question 73

Analysis shows the presence of 203 m g of cholesterol in a sample of blood. How many grams of cholesterol are present in this blood sample?

A) 2.03×10 ^{- 6} g
B) 2.03×10 ^{- 4} g
C) 2.03×10² g
D) 2.03×10⁶ g
E) 2.03×10⁸ g

Question 74

The atomic radius of a beryllium atom is 111 pm. Express this distance in inches.

A) 2.67×10 ^{- 8} inch
B) 4.37×10 ^{- 9} inch
C) 2.42×10 ^{- 13} inch
D) 4.37×10 ^{- 13} inch
E) 43.7 inch

Question 75

The diameter of a US Quarter is approximately 2.35 cm. What is the diameter of a quarter expressed in km and scientific notation ?

A) 2.35×10 ^{- 5} km
B) 2.35×10⁵ km
C) 2.35×10 ^{- 2} km
D) 23.5×10 ^{- 4} km
E) 2.35 km

Question 76

Express 15 inches in cm.

A) 2.5 cm
B) 5.9 cm
C) 38 cm
D) 38.1 cm
E) 38.10 cm

Question 77

The speed limit is 70 miles per hour on some stretches of the interstate. What is this same speed in meters per second, (m/s)?
(1 mile = 1.60 km)

A) 1.9 m/s
B) 31 m/s
C) 1.6×10² m/s
D) 1.1×10⁵ m/s
E) 1.1×10² m/s

Question 78

The area of a telescope lens is 5773 mm². What is this area given in square feet, ft²?
(1 inch = 2.54 cm)

A) 6.214×10 ^{- 2} ft²
B) 8.948 ft²
C) 1.894×10¹ ft²
D) 1.288×10³ ft²
E) 5.363×10⁴ ft²

Question 79

In a new measuring system created by your instructor, 2.16 geb = 1.02 red. How many geb is 7.4 red?

A) 3.5 geb
B) 3.49 geb
C) 15.7 geb
D) 16 geb
E) 1.57 geb

Question 80

What is the speed of an automobile given in miles per second (miles/sec) that is traveling 80. kilometer per hour (km/hour)?
(1 km = 0.621 miles; 1 hour = 60 min; 1 min = 60 sec)

A) 1.4×10 ^{- 2} miles/s
B) 3.6×10 ^{- 2} miles/s
C) 50 miles/s
D) 1.3×10² miles/s
E) 1.8×10⁵ miles/s