Chem Test 1 Study Qs

Front 1

Figure out the conversion factor for in^2 to cm^2.

Back 1

(1 in/2.54 cm)^2

Front 2

Figure out the conversion factor for km^2 to m^2.

Back 2

(1 km/1000 m)^2

Front 3

Describe the difference between intensive and extensive properties.

Back 3

An extensive property depends on the amount of material present. An intensive property is the same regardless of how much material is present.

Front 4

Is mass an intensive or extensive property?

Back 4

Extensive

Front 5

Is density an extensive or intensive property?

Back 5

Intensive.

Front 6

Is volume an intensive or extensive property?

Back 6

Extensive.

Front 7

Is a melting point an intensive or extensive property?

Back 7

Intensive.

Front 8

What is the difference between mass and weight?

Back 8

Mass is the quantity of material present, while weight is the interaction of gravity on mass. An object has a definite mass regardless of its location; its weight will vary with location.

Front 9

Why is your weight on the Moon one-sixth of that on Earth?

Back 9

The lower gravitational attraction on the Moon will make an object appear to have approximately one-sixth its Earth weight. The object has the same mass on the Moon and on the Earth.

Front 10

What is the conversion factor for mi/h to m/s?

Back 10

(1.609 km/1 mi) x (1000 m/1 km) x (1 h/60 min) x (1 min/60 s)

Front 11

What is conversion factor for lb/ft^3 to g/cm^3?

Back 11

(1 kg/2.205 lb)(1000 kg/1 kg) x (1 ft/12 in)^3 (1 in/2.54 cm)^3

Front 12

Will the density increase, decrease, or remain the same if a sample of chlorine gas is compressed?

Back 12

Increase.

Front 13

Will the density increase, decrease, or remain the same if a lead weight is carried from sea level to the top of a high mountain?

Back 13

Remain the same.

Front 14

Will the density increase, decrease, or remain the same if a sample of water is frozen?

Back 14

Decrease.

Front 15

Will the density increase, decrease, or remain the same if an iron bar is cooled?

Back 15

Increase.

Front 16

Will the density increase, decrease, or remain the same if a diamond is submerged in water?

Back 16

Remain the same.

Front 17

Explain the difference between heat and temperature.

Back 17

Heat is an extensive property while temperature is an intensive property.

It takes more heat to boil 1 K of water than to boil 1 mL of water. However, both water samples boil at the same temperature.

Front 18

Does 1 K of water at 320 K have more, less, or the same quantity of energy as 1 K of water at 65°C?

Back 18

Heat will flow from the hot water(65°C = 338 K) to the cooler water (320 K). The 65°C water contains more heat than the cooler water.

Front 19

The average radius of a molecule of lysozyme(an enzyme in tears) is 1430 pm. What is its radius in nanometers(nm)?

Back 19

1.43 nm.

Front 20

The radius of a barium atom is 2.22x10^-10m. What is its radius in angstroms(A°)?

Back 20

2.22 A°

Front 21

What is the length in inches(in) of a 100 m soccer field?

Back 21

3.94 x 10^3 in

Front 22

The center on your basketball team is 6 ft 10 in tall. How tall is the player in centimeters(cm)?

Back 22

2.1 x 10^2 cm

Front 23

A small hole in the wing of a space shuttle requires a 17.7 cm^2 patch.

a) what is the patches area in square kilometers(km^2)?

b) if the patching material costs NASA $3.25/in^2, what is the cost of the patch?

Back 23

a) 1.77 x 10^-9

b) $8.92

Front 24

The area of a telescope lens is 6322 mm^2.

a) what is the area of the lens in square feet(ft^2)?

b) if it takes a technician 45 s to polish 135 mm^2, how long does it take her to polish the entire lens?

Back 24

a) 6.805 x 10^-2 ft^2

b) 2.1 x 10^3 s

Front 25

There are 2.60x10^15 short tons of oxygen in the atmosphere(1 short ton = 2000 lb). How many metric tons of oxygen are present(1 metric ton(T) = 1000 kg)?

Back 25

2.36 x 10^15 T

Front 26

The average density of the Earth is 5.52 g/cm^3. What is its density in:

a) kg/m^3?

b) lb/ft^3?

Back 26

a) 5.52 x 10^3 kg/m^3

b) 345 lb/ft^3

Front 27

The speed of light in a vacuum is 2.998x10^8 m/s. What is its speed in:

a) km/h?

b) mi/min?

Back 27

a) 1.079 x 10^9 km/h

b) 1.118 x 10^7 mi/min

Front 28

The volume of a certain bacterial cell is 1.72 micrometers^3.

a) what is its volume in cubic millimeters(mm^3)?

b) what is the volume of 1x10^5 cells in liters(L)?

Back 28

a) 1.72 x 10^-9 mm^3/cell

b) 2 x 10^22 L

Front 29

a) How many cubic meters of milk are in 1.1 qt?

b) How many liters of milk are in 835 gallons?

Back 29

a)1.0 x 10^-3 m^3

b) 3.16 x 10^3

Front 30

An empty vial weighs 55.32 g.

a) if the vial weighs 185.56 g when filled with liquid mercury(d = 13.54 g/cm^3), what is its volume?

b) How much would the vial weigh if it were filled with water (d = 0.997 g/cm^3 at 25°C)

Back 30

a) 9.626 cm^3

b) 64.92 g

Front 31

An empty Erlenmeyer flask weighs 241.3 g. When filled with water(d=1.00 g/cm^3), the flask and its contents weigh 489.1 g.

a) what is the flasks volume?

b) how much does the flask weigh web filled with chloroform (d=1.48 g/cm^3)?

Back 31

a) 248 cm^3

b) 608 g

Front 32

A small cube of aluminum measures 15.6 mm on a side and weighs 10.25 g. What is the density of aluminum in g/cm^3?

Back 32

2.70 g/cm^3

Front 33

A steel ball-bearing with a circumference of 32.5 mm weighs 4.20 g. What is the density of the steel in g/cm^3 (V of a sphere = 4/3(pi)r^3; circumference of a circle = 2(pi)r?

Back 33

7.25 g/cm^3

Front 34

Perform the following conversions:

a) -164°C (the boiling point of methane, the main component of natural gas) in K.

b) 201 K (the melting point of mercury) to °C.

c) 356.58°C (the boiling point of mercury) in K.

Back 34

a) 109 K

b) -72°C

c) 629.73 K

Hint 34

a, b) No decimal places are kept because the temp in Celsius was measured to the nearest 1 degree.

c) two decimal places are kept because it was measured to one decimal place.

Front 35

Perform the following conversions:

a) 3410°C (the melting point of tungsten, the highest for any element) to K.

b) 6.1x10^3 K (the surface temperature of the So) to °C.

c) -72.7°C (the melting point of sulfur dioxide) to K.

Back 35

a) 3.68 x 10^3 K

b) 5.8 x 10^3°C

c) 200.5 K

Front 36

Anton van Leeuwenhoek, a 17th century pioneer in the use of the microscope, described the microorganisms he saw as "animalcules" whose length was "25 thousandths of an inch." How long were the animal ikea in meters?

Back 36

6.4 x 10^-4 m

Front 37

The distance between two adjacent peaks on a wave is called the wavelength.

a) the wavelength of a beam of ultraviolet light is 225 nanometers(nm). What is its wavelength in meters?

b) the wavelength of a beam of red light is 683 nm. What is its wavelength in angstroms(A°)?

Back 37

a) 2.55 x 10^-7 m

b) 6830 A°

Front 38

In the early 20th century, thin metal foils were used to study atomic structure.

a) how many in^2 of gold foil with a thickness of 1.6x10^-5 in could have been made from a 2.0 troy oz?

b) If gold cost $20.00/troy oz at that time, how many cm^2 of gold foil could have been made from $75.00 worth of gold (1 troy ox = 31.1 g; d of gold = 19.3 g/cm^3)?

Back 38

a) 1.2 x 10^4 in^2

b) 1.5 x 10^5 cm^2

Front 39

A cylindrical tube 7.8 cm high and 0.85 cm in diameter is used to collect blood samples. How many cubic decimeters(dm^3) of blood can it hold(V of a cylinder = (pi)r^2h)?

Back 39

4.4 x 10^-3 dm^3

Front 40

Copper can be drawn into thin wires. How many meters of 34-gauge wire (diameter = 6.304 x 10^-3 in) can be produced from the copper in 5.01 lb of covellite, an ore of copper that is 66% copper by mass?

Back 40

8.32 x 10^3 m

Hint 40

Treat the wire as a cylinder: V of cylinder = (pi)r^2h; a of copper = 8.95 g/cm^3.)

Front 41

After Slippery Rocks home football game, the newspaper reported an estimated attendance of 5100. How many people could actually have been at the game?

Back 41

5.0 x 10^3 - 5.2 x 10^3.

Front 42

Underline the significant zeros in the following numbers:

a) 0.39

b) 0.039

c) 0.0390

d) 3.0900x10^4

Back 42

a) no significant zeroes

b) no significant zeroes

c) 0.039 0

d) 0. 0 9 00 x 10^4

Front 43

Underline the significant zeros in the following numbers:

a) 5.08

b) 508

c) 5.080x 10^3

d) 0.05080

Back 43

a) 5. 0 8

b) 5 0 8

c) 5. 0 8 0 x 10^3

d) 0.05 0 8 0

Front 44

Round off each number to the indicated number of significant figures:

a) 0.0003554(to 2 sf)

b) 35.8348(to 4 sf)

c) 22.4555(to 3 sf)

Back 44

a) 0.00036

b) 35.83

c) 22.5

Front 45

Round off each number to the indicated number of significant figures (sf):

a) 231.554 (to 4 sf)

b) 0.00845 (to 2 sf)

C) 144,000 (to 1 sf)

Back 45

a) 231.6

b) 0.0085

c) 100,000 (1 x 10^5)

Front 46

Carry out the following calculations, making sure that your answer has the correct number of significant figures:

a) (2.795 m x 3.10 m)/6.48 m

b) V = 4/3(pi)r^3, where r = 9.282 cm

c) 1.110 cm + 17.3 cm + 108.2 cm + 316 cm

Back 46

a) 1.34 k

b) 3.350 x 10^3 cm^3

c) 443 cm

Front 47

Carry out the following calculations, making sure that your answer has the correct number of significant figures:

a) (2.420 h + 15.6 g)/4.8 h

b) 7.87 mL/(16.1 mL - 8.44 mL)

c) V = (pi)r^2h, where r = 6.23 cm and h = 4.630 cm

Back 47

a) 3.8

b) 1.0

c) 565 cm^3

Hint 47

b) after the subtraction, the denominator has 2 sig figs.

Front 48

Write the following numbers in scientific notation:

a) 131,000.0

b) 0.00047

c) 210,006

d) 2160.5

Back 48

a) 1.310000 x 10^5

b) 4.7 x 10^-4

c) 2.10006 x 10^5

d) 2.1605 x 10^3

Front 49

Write the following numbers in scientific notation:

a) 281.0

b) 0.00380

c) 4270.8

d) 58,200.9

Back 49

a) 2.810 x 10^2

b) 3.80 x 10^-3

c) 4.2708 x 10^3

d) 5.82009 x 10^4

Front 50

Write the following in decimal (standard) notation. Use a terminal decimal point when needed:

a) 5.55 x 10^3

b) 1.0070 x 10^4

c) 8.85 x 10^-7

d) 3.004 x 10^2

Back 50

a) 5550 b) 10070 c) 0.000000885 d) 0.003004

Front 51

Write the following in decimal (standard) notation. Use a terminal decimal point when needed:

a) 6.500 x 10^3

b) 3.46 x 10^-5

c) 7.5 x 10^2

d) 1.8856 x 10^2

Back 51

a) 6500

b) 0.0000346

c) 750

d) 188.56

Front 52

Convert the following into correct scientific notation:

a) 802.5 x 10^2

b) 1009.8 x 10^-6

c) 0.077 x 10^-9

Back 52

a) 8.025 x 10^4

b) 1.0098 x 10^-3

c) 7.7 x 10^-11

Front 53

Convert the following into correct scientific notation:

a) 14.3 x 10^1

b) 851 x 10^-2

c) 0.077 x 10^-3

Back 53

a) 1.43 x 10^2

b) 8.51

c) 7.5

Front 54

Carry out each of the following calculations? paying special attention to significant figures, rounding, and units(J = joule, the DO not of energy; mol = mole, the SO unit for amount of substance):

a) ((6.626 x 10^-34 J·s)(2.9979 x 10^8 m/s))/(489 x 10^-9 m)

b) ((6.022 x 10^23 molecules/mol)(1.19 x 10^2 g))/46.07 g/mol

c) (6.022 x 10^23 atoms/mol)(2.18 x 10^-18 J/atom)((1/2^2)-(1/3^2) where the numbers 2 and 3 in the last term are exact.

Back 54

a) 4.06 x 10^-19 K

b) 1.56 x 10^24

c) 1.82 x 10^5 J/mol

Front 55

Carry out each of the following calculations, paying special attention to significant figures, rounding, and units:

a) (8.32 x 10^7 g)/((4/3)(3.1416)(1.95 x 10^2 cm)^3). The term (4/3) is exact.

b) ((1.84 x 10^2 g)(44.7 m/s)^2)/2. The term 2 is exact.

c) ((1.07 x 10^-4 mol/L)^2(2.6 x 10^-3 mol/L)/((8.35 x 10^-5 mol/L)(1.48 x 10^-2 mol/L)^3

Back 55

a) 2.68 g/cm^3

b) 1.84 x 10^5 g·m^2/s^2

c) 0.11 L/mol

Front 56

Which statements include exact numbers?

a) Angel Falls is 3212 ft high.

b) there are eight known planets in the Solar System.

c) there are 453.59 g in 1 lb.

d) there are 1000 mm in 1 m.

Back 56

a) measured quantity, NOT an exact number.

b) number count, IS an exact number.

c) not a unit definition, NOT an exact number.

d) definition of the prefix "milli-", IS an exact number.

Front 57

Which of the following include exact numbers?

a) the speed of light in a vacuum is a physical constant; to six significant figures, it is 2.99792 x 10^8 m/s.

b) the density of Mercury at 25°C is 13.53 g/mL.

c) there are 3600 a in 1 h.

d) The United States has 50 states.

Back 57

a) measured quantity, is NOT an exact number.

b) measured quantity, is NOT an exact number.

c) definition of minutes and hours, IS an exact number.

d) counted value, IS an exact number.

Front 58

Read the following scales to the appropriate number of significant figures:

Back 58

a) 108.4

b) 108.0

c) 0.18

d) 0.10

e) 0.08

Front 59

These organic solvents are used to clean compact discs:

Solvent......... Density(g/mL) at 20°C

Chloroform............ 1.492

Diethyl ether.......... 0.714

Ethanol................... 0.789

Isopropanol........... 0.785

Toluene.................. 0.867

If a 15.00 mL sample of CD cleaner weighs 11.775 h at 20°C, which solvent is most likely to be present?

Back 59

Isopropanol

Hint 59

Density of the cleaner is 0.7850 g/mL.

Front 60

Stainless steels are a major component of fine surgical instruments. An engineer? testing a more energy-efficient process for preparing Stainless Steel 304 (d = 7.90 g/cm^3), makes a cube of the steel that is 15.0 mm on each edge and weighs it. If the new process works, what should the mass of the cube be?

Back 60

26.7 g

Front 61

Soft drinks are about as dense as water (1.0 g/cm^3); many common metals, including iron, copper, and silver, have densities around 9.5 g/cm^3.

a) what is the mass of the liquid in a standard 12-oz bottle of diet cola?

b) what is the mass of a dime?

Back 61

a) mass = 3.5 x 10^2 h

b) mass = 2 g/dime

Hint 61

A stack of 5 dimes has a volume of about 1 cm^3.

Front 62

Suppose your dorm room is 11 ft wide by 12 ft long by 8.5 ft high and has an air conditioner that exchanges air at a rate of 1200 L/min. How long would it take the air conditioner to exchange the air in your room?

Back 62

26 minutes.

Front 63

An Olympic-size pool is 50.0 m long and 25.0 m wide. How many gallons of water (d = 1.0 g/mL) are needed to fill the pool to an average depth of 4.8 ft?

Back 63

4.8 x 10^5 gal

Front 64

According to the lore of ancient Greece? Archimedes discovered the displacement method of density determination while bathing and used it to find the composition of the Kings crown. If a crown weighing 4 lb 13 oz displaces 186 mL of water, is the crown made of pure gold(d = 19.3 g/cm^3)?

Back 64

12 g/cm^3

Front 65

Earth's oceans have an average depth of 3800 m, a total area of 3.63 x 10^8 km^2, and an average concentration of dissolved gold of 5.8 x 10^-9 g/L.

a) How many grams of gold are in the oceans?

b) If a recent price of gold was $370.00/troy oz, what is the value of gold in the oceans(1 troy oz = 31.1 g; a of gold = 19.3 g/cm^3)?

Back 65

a) 8.0 x 10^12 h

b) $9.5 x 10^13

Front 66

Liquid nitrogen is obtained from liquefied air and is used industry ally to prepare frozen foods. It boils at 77.36 K.

a) What is this temperature in °C?

b) At the boiling point, the density of the liquid is 809 g/L and that of the gas is 4.566 g/L. How many liters of liquid nitrogen are produced when 895.0 K of nitrogen gas is liquefied at 77.36 K?

Back 66

a) -195.79°C

b) 5.05 L

Front 67

If a rain drop weighs 65 mg on average and 5.1 x 10^5 raindrops fall on a lawn every minute, what mass (in kg) of rain falls on the lawn in 1.5 h?

Back 67

3.0 x 10^3 kg