How many significant figures are in the number 0.05000?
How many significant figures are in the number 0.050 x 108?
How many significant figures are in the number 0.00899?
Calculate the following to the correct number of significant figures.
3322.1 + 1.2990 = _____
Calculate the following to the correct number of significant figures.
661.5 + 3.01 = _____
Calculate the following to the correct number of significant figures.
232.3 - 59.309 = _____
Calculate the following to the correct number of significant figures.
2.871 / 0.0550 = _____
Calculate the following to the correct number of significant figures.
2.94 / 0.42 = _____
Calculate the following to the correct number of significant figures.
77.25 x 0.0034 = _____
Do the indicated arithmetic and give the answer to the correct number of significant figures.
(24.70 + 0.529) / 82.5545 = _____
Calculate the following to the correct number of significant figures.
(0.00030 x 22.6) + 5.002 = _____
Do the indicated arithmetic and give the answer to the correct number of significant figures.
(5.669 + 66.3) x (0.026 + 3.60) = _____

The correct value of the following expression is:
(10 -67 x 10 27 ) 3 / (10 75 ) 1/3 = _____
The correct value of the following expression is:
(10 30 x 10 -10 ) 2 / (10 40 ) 1/4 = _____
The correct value of the following expression is:
(10 -50 x 10 10 ) 3 / (10 90 ) 1/3 = _____
Express the quantity 785.4 g in kg rounded to the nearest 0.01 kg.
Round off the quantity 10.256 m to the nearest 0.1 m.
Round off the quantity 0.042349 m to the nearest 0.1 mm.
Which of the following metric relationships is correct? a) 1 kilogram = 104 decigrams b) 100 centimeters = 1 meter c) 1 nanogram = 103 micrograms d) 1 microliter = 10-6 liters e) 1 kilogram = 106 milligrams
Which of the following metric relationships is correct? a) 1 kilogram = 106 milligrams b) 1 nanogram = 10-3 micrograms c) 1 microliter = 103 milliliters d) 1 millimeter = 10-3 meters e) 100 centimeters = 1 meter

In which of the following sequences are the prefixes of the metric system listed in order of increasing size? a) micro, kilo, deci b) centi, milli, deci c) nano, micro, milli d) nano, milli, micro e) milli, deci, centi
How many cubic millimeters equals one cubic decimeter?
How many square decimeters equals one square centimeter?
The cholesterol content of the blood of a male patient is at the rather high value of 325 mg/dL. What is the number of grams of cholesterol in a liter of blood?
The hormone adrenaline in blood plasma is present in 6 x 10-8 grams per liter. What is the amount in micrograms per milliliter?
The blood glucose level of a fasting patient drops to 65 mg/dL. What is the number of grams of glucose in 1.0 L of blood?
Sea water contains 1.3
g of magnesium ion in 1.00 kL.
How many micrograms of magnesium ions are in 1.00 mL of seawater?
Sea water contains 1.3 g of magnesium ion in 1.00 kL. How many mg of magnesium ions are in 1.00 mL of seawater?
Sea water contains 0.41 g of calcium ion in 1.00 kL. How many micrograms of calcium ions are in 1.00 mL of seawater?
During a severe pollution period in a European city, the concentration of lead in the air was 3.0 x 10 -6 g per cubic meter. What was the concentration expressed in milligrams per liter?
A brand of cigarettes contains 15 mg of tar. If a person smokes 20 cigarettes each day, how many grams of tar are inhaled in 30 days?

The diameter of an iridium atom is 2.7 Å. Express this diameter in picometers.
The distance between two centers of the oxygen atoms in an oxygen molecule is
1.21 Å. What is the distance in picometers?
The diameter of an iridium atom is 2.7 Å. Express this diameter in nanometers.
A runner jogs a mile in 12 minutes. Calculate the speed in meters per second.
A bushel of oats weighs 32 pounds. What is the mass of a bushel of oats in kilograms?
The distance from home plate to first base is 90.0 feet. What is the distance in meters?
An object has a surface area 4 ft 3 in by 14 in. What is the area in cm 2 ?
An object has a surface area 4 ft 3 in by 14 in. What is the area in m 2 ?
A sheet of metal measures 2.5 m by 41.2 cm and is 3.2 mm thick. What is the volume in m 3 ?
A 12.5 liter balloon contains 2.23 g of helium. What is the density of helium in g/cm 3 ?
A carat is equal to 200 mg. What is the density, in g/cm 3 , of a 2.5 carat diamond whose volume is 0.142 cm 3 ?
The densities of cadmium, copper and zinc are 8.64, 8.92 and 7.14 g/cm 3 respectively. A metal with a volume of 15.0 cm 3 has a mass of 133.8 g. What is the metal?

The mass of a solid sphere of iron with a radius = 0.80 cm is 16.9 g. What is the density? (The volume of a sphere is (4 r 3 )/3 where r = radius.)
The mass of a solid sphere of aluminum with a radius = 1.1 cm is 15.0 g. What is the density? (The volume of a sphere is (4 r 3 )/3 where r = radius.)
A solution containing 12.0% sodium hydroxide by mass has a density of 1.31 g/cm 3 . What is the volume, in liters, required to obtain 1.65 kg of sodium hydroxide?
Air is 21% oxygen by volume. Pure oxygen has a density of 1.31 g/L. What is the volume of a room, in liters, that contains 60.0 kg of oxygen?
The density of chloroform is 1.4832 g/mL. What volume in mL will 5.64 g of chloroform occupy?
Bone has an average density of 1.8 g/cm 3 . What mass of bone, in grams, is required for a bone graft involving 6.0 cubic centimeters of bone tissue?
Liquid sodium (density = 0.934 g/cm 3 ) is used to cool nuclear reactors on ships. What is the mass, in grams, of 121 liters of liquid sodium?
A 25.0 mm x 40.0 mm piece of gold (density = 19.32 g/cm 3 ) is 0.20 mm thick. What is the mass, in grams, of the metal?
Which of the following samples has the largest mass? a) 1.42 g diamond (density = 2.84 g/cm 3 ) b) 0.75 cm
3
opal (density = 2.20 g/cm
3
) c) 1.00 cm
3
ivory (density = 1.90 g/cm
3

Which of the following samples has the smallest mass? a) 25 g of lead (density = 11.3 g/cm
3
) b) 3.0 cm 3 of chromium (density = 7.20 g/cm 3 ) c) 7.0 cm
3
of aluminum (density = 2.70 g/cm
3
)
The radius of the hydrogen nucleus is 1.0 x 10 -12 cm and its mass is 1.67 x 10 -24 g. What is the density of the nucleus in kg/L? (The volume of a sphere is (4 r 3 )/3 where r is the radius.)
The radius of the hydrogen nucleus is 1.0 x 10 -2 pm and its mass is 1.67 x 10 -24 g. What is the density of the nucleus in g/cm 3 ? (The volume of a sphere is (4 r 3 )/3 where r is the radius.)
In a hypothermia case, the body temperature dropped to 85 o F. What is the temperature equivalent in o C?
The boiling point of oxygen is 55 o K. What is the equivalent temperature on the Fahrenheit scale?
The melting point of silicon is 2570 o F. What is the equivalent temperature on the Celsius scale?
Which of the following statements is correct? a) A mixture containing two compounds must be heterogeneous. b) A homogeneous mixture must be uniform. c) A compound may contain only one type of atom. d) A pure substance must contain only one type of atom. e) A heterogeneous mixture must contain at least three elements.

A mixture must always: a) have definite composition b) have variable composition c) be heterogeneous d) be homogeneous e) contain two substances
A brand of gasoline can be shown to be a mixture by: a) smelling it b) separating it into its components c) reacting it with oxygen d) burning it e) determining its density
The correct symbol for strontium is: a) Si b) Sr c) Sn d) St e) S
Which of the following elements has a symbol having only one letter? a) barium b) potassium c) silicon d) mercury e) chlorine

Which of the following elements has a symbol having only one letter? a) tin b) phosphorus c) iron d) sodium e) antimony
Cobalt (atomic number 27) is necessary for growth and is present in vitamin B
12
. The only naturally occurring isotope of the element cobalt has a mass number of 59. How many neutrons are in cobalt?
An isotope of chromium whose mass number is 51 is used in compounds to determine the position of the placenta in pregnant women. The atomic number of chromium is 24. What is the isotopic symbol of this element?
The species 27
13
Al 3+ contains: a) 13 protons and 16 electrons b) 14 protons and 10 electrons c) 13 protons and 10 electrons d) 13 protons and 14 electrons e) 14 protons and 16 electrons
An anion has a negative charge because: a) None of the above correctly completes the statement b) there are more neutrons than protons c) there are fewer electrons than protons d) it is a positively charged nucleus e) the neutrons in the nucleus are charged

What is the symbol for the phosphate ion?
a) PO
4
3b) PO
3
4c) PO
3
3d) PO e) PO
4
-
What is the symbol for the sulfate ion? a) SO
4
2b) SO
3
c) SO
2
2d) SO
4
e) SO
3
2-
What is the chemical formula for thallium (III) oxide? a) Tl
2
O
3 b) Tl
3
O c) TlO d) Tl
3
O
2 e) TlO
3
Consider the formulas NiF
2
and NIF
2
. These symbols represent species: a) which contain different numbers of atoms. b) which are identical. c) having the same molar mass. d) having the same composition. e) having equal numbers of atoms.

What is the chemical names of Fe
3
(PO
4
)
2
? a) Iron (III) phosphite b) Iron (II) phosphide c) Iron (II) phosphite d) Iron (II) phosphate e) Iron (III) phosphate
What is the chemical name of Tl
2
(SO
4
)
3
? a) Thallium (III) sulfite b) Thallium (II) sulfite c) Thallium (III) sulfide d) Thallium (III) sulfate e) Thallium (II) sulfate
What is the chemical name of La(HSO
3
)
3
? a) Lanthanum (III) sulfite b) Lanthanum (I) bisulfite c) Lanthanum (III) bisulfate d) Lanthanum (III) bisulfite e) Lanthanum (III) sulfate
Silver (Atomic weight 107.868) has two naturally-occurring isotopes with isotopic weights of 106.90509 and 108.90470. What is the percentage abundance of the heavier isotope?
Assume that the element 117 Uus is synthesized and that the sample contains 34.6% 284 Uus (283.4 amu),
21.2% 285 Uus (284.7 amu) and 44.2% 288 Uus (287.8 amu). What is the value of the atomic weight?
Magnesium (Atomic weight 24.305) has three naturally-occurring isotopes. Two of these are 24 Mg with isotopic weight 23.98504 (abundance 78.70%) and 25 Mg with isotopic weight 24.98584 (abundance
10.13%) Which of the following isotopic weights is the most likely for the third isotope?