Chapter I Chemistry

Dry ice (carbon dioxide) changes from a solid to a gas at -78.5°C. What is this temperature in °F?

-109°F

The boiling point for liquid nitrogen is 77 K. What is the temperature in degrees Fahrenheit?

-321°F

The boiling point for liquid helium is 4.0 K. What is the temperature in degrees Fahrenheit?

-452.5°F

How many mm3 are in 16.7 cm3?

.67 × 104 mm3

If the density of corn syrup is 1.380 g/mL and a sample of corn syrup has a mass of 32 grams, what is the volume of corn syrup, in liters?

0.023 L

The result of (3.8621 × 1.5630) - 5.98 is properly written as

0.06

Given that 1 inch = 2.54 cm, 1.00 cm3 is equal to

0.0610 in3

The density of mercury, the only metal to exist as a liquid at room temperature, is 13.6 g/cm3. What is that density in pounds per cubic inch? (1 in = 2.54 cm; 1 lb = 454 g)

0.491 lb/in3

Convert 500. milliliters to quarts. (1 L = 1.0567 qt)

0.528 qt

Which is correct if 0.01234 is rewritten in scientific notation?

1.234 × 10-2

The diameter of Earth is 12.7 Mm. Express this diameter in centimeters.

1.27 × 109 cm

The distance between carbon atoms in ethylene is 134 picometers. Which of the following expresses that distance in meters?

1.34 × 10-10 m

A flask has a mass of 78.23 g when empty and 593.63 g when filled with water. When the same flask is filled with concentrated sulfuric acid, H2SO4, its mass is 1026.57 g. What is the density of concentrated sulfuric acid? (Assume water has a density of 1.00 g/cm3 at the temperature of the measurement.)

1.840 g/cm3

The SI prefixes milli- and mega- represent, respectively:

10-3 and 106

The recommended daily allowance (RDA) of calcium is 1.2 g. Calcium carbonate contains 12.0% calcium by mass. How many grams of calcium carbonate are needed to provide the RDA of calcium?

10. g

If a patient in the hospital is running a temperature of 39.5°C, what is this in degrees Fahrenheit?

103.1°F

The SI prefix mega- (M) means

106

Acetic acid boils at 244.2°F. What is its boiling point in degrees Celsius?

117.9°C

Select the answer that expresses the result of this calculation with the correct number of significant figures.

13.602 × 1.90 × 3.06 13

Acetone, which is used as a solvent and as a reactant in the manufacture of Plexiglas®, boils at 56.1°C. What is the boiling point in degrees Fahrenheit?

133°F

What is the volume of a container that contains 14.3 g of a substance having a density of 0.988 g/cm3?

14.5 cm3

Which is correct if 15,390,000 is rounded to two significant figures?

15,000,000

How many inches are in 382.5 cm? (1 in = 2.54 cm)

150.6 in

Which of these quantities represents the largest mass?

2.0 × 102 cg

The speed needed to escape the pull of Earth's gravity is 11.3 km/s. What is this speed in mi/h? (1 mile = 1609 m)

25,300 mi/h

Select the answer with the correct number of decimal places for the following sum: 13.914 cm + 243.1 cm + 12.00460 cm =

269.0 cm

If the temperature is 38.0°F then what is the temperature in kelvins?

276.5 K

Some molecules move with speeds approaching the "escape velocity" from Earth, which is 7.0 miles per second. What is this speed in cm/h? (1 mi = 1609 m)

4.1 × 109 cm/h

Which of the following is not an SI base unit?

gram

Which of the following does not have a uniform composition throughout?

heterogeneous mixture

If a liquid contains 60% sugar and 40% water throughout its composition, then what is it called?

homogeneous mixture

Which of the following is a tentative explanation for a set of observations?

hypothesis

Which of the following activities is not a part of good science?

indulging in speculation

When the value of something does not depend on the amount of the matter then what is this called?

intensive property

The SI base unit of mass is

kg

What is the term used for findings that are summarized based on a pattern or trend?

law

Which of these is an example of a physical property?

lead becomes a liquid when heated to 601°C.

Which of the following is an extensive property of oxygen?

mass

Which of the following is an extensive property?

mass

Which of the following is an example of an observation?

paraffin wax begins to melt at 57°C.

You prepare 1000. mL of tea and transfer it to a 1.00-quart pitcher for storage. Which of the following statements is true? (1 L = 1.0567 qt)

the pitcher will be completely filled and a small amount of tea will overflow.

What is a unifying principle that explains a body of experimental observations?

theory

Which one of these represents a chemical change?

turning hair yellow with bleach

Which of the following is a 'substance' according to the definition given in your textbook?

water

Which one of these represents a physical change?

water, when heated, forms steam.

After carrying out the operation (13.7 + 0.027) ÷ 8.221, how many significant figures are appropriate to show in the result?

3

A dose of medication was prescribed to be 35 microliters. Which of the following expresses that volume in centiliters?

3.5 × 10-3 cL

The average distance between the Earth and the Moon is 240,000 miles. Express this distance in kilometers. (1 mi = 1609 m)

3.9 × 105 km

The average distance between the Earth and the Moon is 240,000 miles. Express this distance in meters. (1 mi = 1609 m)

3.9 × 108 m

Isopropyl alcohol, commonly known as rubbing alcohol, boils at 82.4°C. What is the boiling point in kelvins?

355.6 K

If normal body temperature is 98.6°F then what is this in degrees Celsius?

37.0°C

A large pizza has a diameter of 15 inches. Express this diameter in centimeters. (1 in = 2.54 cm)

38 cm

There are 58 counties in California and about 660,000 people in each county. How many million people live in California?

38 million people

How many significant figures are in 0.006570?

4

How many significant figures does the sum 8.5201 + 1.93 contain?

4

The number 1.050 × 109 has how many significant figures?

4

One of the common intravenous fluids, called physiological saline, is a homogeneous mixture of NaCl in water. In this mixture, 0.89% of the mass is contributed by the NaCl. What mass of NaCl is found in 450. mL of physiological saline? ((Density of physiological saline = 1.005 g/cm3)

4.0 g

The city of Los Angeles is now approximately 2400 miles south of Anchorage, Alaska. It is moving slowly northward as the San Andreas fault slides along. If Los Angeles is to arrive near Anchorage in 76 million years, at what average rate will it have to move in mm per month? (1 mi = 1609 m)

4.2 mm/mo.

A geology student found an irregularly shaped rock, with a mass of 28.63 grams, and placed it into a graduated cylinder containing 13.31 mL of water. If the water level increased to 19.73 mL after the rock was placed in the cylinder, what is the density of the rock, in g/mL?

4.46 g/mL

Talc is a mineral with low conductivity for heat and electricity which is not attacked by acid. It is used in talcum powder and face powder. Suppose a sample of talc weighs 13.65 g with a density of 1.75 g/cm3 in mineral oil. If this same sample of talc in air weighs 35.97 g, assuming no volume change, what is the density of the talc sample in air?

4.61 g/cm3

Which of the following speeds is the greatest? (1 mi = 1609 m)

40 mi/h

Radio waves travel at the speed of light, which is 3.00 × 108 m/s. How many minutes does it take for a radio message to reach Earth from Saturn if Saturn is 7.9 × 108 km from Earth?

44 min

50.0 grams of acetic acid are required for an experiment. What volume, in milliliters, of a 1.105 g/cm3 acetic acid solution must be measured for the experiment?

45.2 mL

An empty flask's mass is 17.4916 g, and its mass is 43.9616 g when filled with water at 20.0°C (density = 0.9982 g/mL). The density of "heavy water" at 20.0°C is 1.1053 g/mL. What is the mass of the flask when filled with heavy water at 20.0°C?

46.8016 g

Iron has a density of 7.87 g/cm3. What mass of iron would be required to cover a football playing surface of 120 yds × 60. yds to a depth of 1.0 mm? (1 inch = 2.54 cm)

47 Mg

Which is correct if 52.068881 is rewritten in scientific notation and rounded to three significant figures?

5.21 × 101

How many milliliters is 0.0055 L?

5.5 mL

The mass of a sample is 550 milligrams. Which of the following expresses that mass in kilograms?

5.5 × 10-4 kg

Express 122.0°F in °C.

50.0°C

A smart phone has dimensions of 4.9 inches (height), 2.3 inches (width) and 8.0 millimeters (depth). What is the volume of the smart phone in cubic centimeters? (1 in = 2.54 cm)

58 cm3

An average Mastiff puppy weighs 2.72 kilograms. How many pounds is an average Mastiff puppy? (1lb = 453.6 g)

6.00 lb

How many hertz is 600.11 MHz?

6.0011 × 108 Hz

How many micrograms are in 65.3 kg?

6.53 × 1010 mg

How many cubic inches are in 1.00 liter? (1 in = 2.54 cm)

61.0 in3

The dark meat of a 20-pound turkey requires an internal temperature of 180°F to be fully cooked. What minimum temperature reading should be displayed on a food thermometer that only measures in degrees Celsius?

82°C

Radio waves travel at the speed of light, which is 3.00 × 108 m/s. How many kilometers will radio messages to outer space travel in exactly one year? (365.24 days = 1 y)

9.47 × 1012 km

If you have a graduated cylinder containing 15.5 mL and this volume changes to 95.2 mL after a metal with a mass of 7.95 g is dropped into the graduated cylinder, then what is the density of this metal?

9.97 × 10-2 g/mL

What is the volume in milliliters of a 32.0 fl oz can of juice? (1 fl oz = 29.6 mL)

947 mL

77 K is colder than 4 K.

FALSE

A particular temperature in degrees Celsius is larger than the temperature in kelvins.

FALSE

A scoop of vanilla ice cream is a pure substance.

FALSE

Boiling point and melting point are extensive properties.

FALSE

The ripening of fruit, once picked, is an example of physical change.

FALSE

The rusting of a piece of iron under environmental conditions is a physical change.

FALSE

The volume of a substance is an intensive property.

FALSE

When applying the scientific method, it is important to avoid any form of hypothesis.

FALSE

Matter is anything that has mass and occupies space.

TRUE

The density of a substance is an intensive property.

TRUE

The juice from an orange is a mixture.

TRUE

The number 6.0448, rounded to 3 decimal places, becomes 6.045.

TRUE

When applying the scientific method, a model or theory should be based on experimental data.

TRUE

Zero kelvin 0 K < 0°F < 0°C

TRUE

Which of the following cannot be separated into simpler substances by chemical means?

element

Which of the following is a chemical change?

broiling a steak on a grill