Question 1

Isopropyl alcohol, commonly known as rubbing alcohol, boils at 82.4°C. What is the boiling point in kelvins?
A) 387.6 K
B) 355.6 K
C) 323.6 K
D) 190.8 K
E) -190.8 K

Accepted Answer

To convert Celsius to Kelvin, we add 273.15. Therefore, the boiling point of isopropyl alcohol in Kelvin can be calculated as follows:
82.4 + 273.15 = 355.55 K
Rounded to one decimal place, the answer is 355.6 K.

Question 2

Which of the following is an extensive property of oxygen?
A) boiling point
B) temperature
C) average kinetic energy of molecules
D) density
E) mass

Accepted Answer

Mass is an extensive property, meaning it depends on the amount of substance present.

Question 3

Which of the following is not an SI base unit?
A) meter
B) ampere
C) second
D) gram
E) kelvin

Accepted Answer

The SI base units are meter, kilogram, second, ampere, kelvin, mole, and candela. The gram is a common unit of mass, but it is not an SI base unit. The kilogram is the SI base unit for mass.

Question 4

Acetic acid boils at 244.2°F. What is its boiling point in degrees Celsius?
A) 382.0°C
B) 167.7°C
C) 153.4°C
D) 117.9°C
E) 103.7°C

Accepted Answer

The answer of Acetic acid boils at 244.2°F. What is...

Question 5

The SI unit of speed (velocity) is
A) km/h.
B) km/s.
C) m/h.
D) m/s.
E) None of these choices are correct.

Accepted Answer

The SI unit of speed (velocity) is meters per second (m/s). This is the standard unit used in physics to measure speed, and is based on the meter (for distance) and the second (for time). Other units such as km/h and km/s are used for convenience or in specific applications, but m/s is the most widely used and accepted unit for speed in scientific contexts.

Question 6

The average distance between the Earth and the Moon is 240,000 miles. Express this distance in kilometers. A) 6.1 × 10⁵ km B) 5.3 × 10⁵ km C) 3.9 × l0⁵ km D) 1.5 × 10⁵ km E) 9.4 × 10⁴ km

Accepted Answer

The answer of The average distance between the Earth and...

Question 7

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? A) 849 lb/in³ B) 491 lb/in³ C) 376 lb/in³ D) 0.491 lb/in³ E) 1.83 × 10^-3 lb/in³

Accepted Answer

To convert from g/cm³ to lb/in³, use the conversion factors: 1 g/cm³ = 0.036127 lb/in³. Therefore, 13.6 g/cm³ * 0.036127 lb/in³ = 0.491 lb/in³.

Question 8

If the density of a certain spherical atomic nucleus is 1.0 × 10¹⁴ g cm^-3 and its mass is 2.0 × 10^-23 g, what is its radius in cm? A) 3.6 × 10^-13 cm B) 2.0 × 10^-37 cm C) 4.8 × 10^-38 cm D) 2.2 × 10^-19 cm E) None of these choices are correct.

Accepted Answer

The density of a sphere is given by the formula:$$ho = \frac{3M}{4\pi r^3}$$where $ho$ is the density, $M$ is the mass, and $r$ is the radius.We can rearrange this formula to solve for the radius:$$r = \sqrt[3]{\frac{3M}{4\pi ho}}$$Plugging in the given values, we get:$$r = \sqrt[3]{\frac{3(2.0 	imes 10^{-23} 	ext{ g})}{4\pi (1.0 	imes 10^{14} 	ext{ g cm}^{-3})}} = 3.6 	imes 10^{-13} 	ext{ cm}$$Therefore, the correct answer is A.

Question 9

Given that 1 inch = 2.54 cm, 1 cm³ is equal to A) 16.4 in³. B) 6.45 in³. C) 0.394 in³. D) 0.155 in³. E) 0.0610 in³.

Accepted Answer

The answer of Given that 1 inch = 2.54 cm,...

Question 10

The area of a 15-inch pizza is 176.7 in². Express this area in square centimeters. A) 1140. cm² B) 448.8 cm² C) 96.8 cm² D) 69.57 cm² E) 27.39 cm²

Accepted Answer

To convert square inches to square centimeters, multiply the area in square inches by 6.4516 (since 1 square inch = 6.4516 square centimeters). Therefore, 176.7 in² * 6.4516 = 1140 cm².

Question 11

If the price of gold at the morning fixing in London was $5310 per lb, what would a kilogram of gold have cost in £ (pounds)? (Assume an exchange rate of $1.00 = £0.545)
A) £1310
B) £3510
C) £6370
D) £10400
E) £17100

Accepted Answer

1 lb = 0.453592 kg (conversion factor)
$5310 per lb = $11,704.76 per kg
$11,704.76 x £0.545 = £6,370.09
Therefore, a kilogram of gold would have cost £6,370 (rounded to the nearest pound) which corresponds to choice C.

Question 12

The joule is the SI unit of energy and is equal to 1 kg m² s^-2. The erg is another energy unit, equal to 1 g cm² s^-2. Use unit conversion methods to work out how many ergs are in 1 joule. A) 10^-1 ergs B) 10 ergs C) 10² ergs D) 10⁵ ergs E) 10⁷ ergs

Accepted Answer

1 joule is equal to 10^7 ergs because 1 kg = 1000 g and 1 m = 100 cm, so 1 kg m^2 s^-2 = 1000 g (100 cm)^2 s^-2 = 10^7 g cm^2 s^-2.

Question 13

The speed needed to escape the pull of Earth's gravity is 11.3 km/s. What is this speed in mi/h? A) 65,500 mi/h B) 25,300 mi/h C) 18,200 mi/h D) 1,090 mi/h E) 5.02 × 10^-3 mi/h

Accepted Answer

We can use the conversion factors: 
1 km = 0.621371 mi 
1 hour = 3600 seconds

11.3 km/s = (11.3 km/s)(0.621371 mi/km)(3600 s/h) = 25,303 mi/h

Therefore, the answer is B) 25,300 mi/h (rounded to the nearest hundred).

Question 14

Which of the following abbreviations of the given SI base unit is incorrect?
A) second: s
B) kilogram: kg
C) kelvin: K
D) mole: m
E) ampere: A

Accepted Answer

The abbreviation for mole is not "m" but "mol".

Question 15

At a pressure of one billionth (10^-9) of atmospheric pressure, there are about 2.7 × 10¹⁰ molecules in one cubic centimeter of a gas. How many molecules is this per cubic meter? A) 2.7 × 10¹⁶ B) 2.7 × 10¹⁴ C) 2.7 × 10¹² D) 2.7 × 10⁸ E) 2.7 × 10⁴

Accepted Answer

There are 1,000,000 cubic centimeters in a cubic meter, so multiply 2.7 × 10^10 molecules/cm³ by 10^6 to get 2.7 × 10^16 molecules/m³.

Question 16

Which of the following correctly shows how to convert a density of 20.1 g cm^-3 to units of kg m^-3? A) B) C) D) E)

Accepted Answer

The answer of Which of the following correctly shows how...

Question 17

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?
A) 159°F
B) 133°F
C) 101°F
D) 69.0°F
E) 43.4°F

Accepted Answer

The answer of Acetone, which is used as a solvent...

Question 18

Which of the following abbreviations of the given SI base unit is incorrect?
A) second: s
B) kilogram: kg
C) meter: m
D) mole: mol
E) kelvin: k

Accepted Answer

The proper abbreviation for kelvin is "K", not "k".

Question 19

Talc is a mineral that has low conductivity for heat and electricity and that is not attacked by acid. It is used as talcum powder and face powder. A sample of talc weighs 35.97 g in air and 13.65 g in mineral oil (d = 1.75 g/cm³). What is the density of talc? A) 4.61 g/cm³ B) 2.82 g/cm³ C) 2.63 g/cm³ D) 2.44 g/cm³ E) 1.61 g/cm³

Accepted Answer

First, we can use the formula for density: density = mass / volume. We know the mass of the talc sample, so we just need to find the volume. We can use the method of displacement to find the volume. The sample weighs 35.97 g in air and 13.65 g in mineral oil, so it displaced a volume of:

(volume of mineral oil with talc) - (volume of mineral oil without talc)

= (mass of talc + mass of mineral oil with talc) - (mass of mineral oil without talc)

= (35.97 g - 13.65 g) / (1.75 g/cm3)

= 12.32 cm3

Now we can calculate the density:

density = mass / volume = 35.97 g / 12.32 cm3 = 2.92 g/cm3

The closest answer choice is B, 2.82 g/cm3.

Question 20

The SI prefix mega- (M) means A) 10^-6. B) 10^-3. C) 10³. D) 10⁶. E) 10⁹.

Accepted Answer

The prefix mega- (M) means 10^6.

Quiz 1: Keys to Studying Chemistry Definitions, Units, and Problem Solving

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

Which of the following is an extensive property of oxygen?

Which of the following is not an SI base unit?

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

The SI unit of speed (velocity) is

The average distance between the Earth and the Moon is 240,000 miles. Express this distance in kilometers.

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?

If the density of a certain spherical atomic nucleus is 1.0 × 10¹⁴ g cm^-3 and its mass is 2.0 × 10^-23 g, what is its radius in cm?

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

The area of a 15-inch pizza is 176.7 in². Express this area in square centimeters.

If the price of gold at the morning fixing in London was $5310 per lb, what would a kilogram of gold have cost in £ (pounds) ? (Assume an exchange rate of $1.00 = £0.545)

The joule is the SI unit of energy and is equal to 1 kg m² s^-2. The erg is another energy unit, equal to 1 g cm² s^-2. Use unit conversion methods to work out how many ergs are in 1 joule.

The speed needed to escape the pull of Earth's gravity is 11.3 km/s. What is this speed in mi/h?

Which of the following abbreviations of the given SI base unit is incorrect?

At a pressure of one billionth (10^-9) of atmospheric pressure, there are about 2.7 × 10¹⁰ molecules in one cubic centimeter of a gas. How many molecules is this per cubic meter?

Which of the following correctly shows how to convert a density of 20.1 g cm^-3 to units of kg m^-3?

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?

Which of the following abbreviations of the given SI base unit is incorrect?

Talc is a mineral that has low conductivity for heat and electricity and that is not attacked by acid. It is used as talcum powder and face powder. A sample of talc weighs 35.97 g in air and 13.65 g in mineral oil (d = 1.75 g/cm³) . What is the density of talc?

The SI prefix mega- (M) means

Quiz 1: Keys to Studying Chemistry Definitions, Units, and Problem Solving

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

Which of the following is an extensive property of oxygen?

Which of the following is not an SI base unit?

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

The SI unit of speed (velocity) is

The average distance between the Earth and the Moon is 240,000 miles. Express this distance in kilometers.

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?

If the density of a certain spherical atomic nucleus is 1.0 × 1014 g cm-3 and its mass is 2.0 × 10-23 g, what is its radius in cm?

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

The area of a 15-inch pizza is 176.7 in2. Express this area in square centimeters.

If the price of gold at the morning fixing in London was $5310 per lb, what would a kilogram of gold have cost in £ (pounds) ? (Assume an exchange rate of $1.00 = £0.545)

The joule is the SI unit of energy and is equal to 1 kg m2 s-2. The erg is another energy unit, equal to 1 g cm2 s-2. Use unit conversion methods to work out how many ergs are in 1 joule.

The speed needed to escape the pull of Earth's gravity is 11.3 km/s. What is this speed in mi/h?

Which of the following abbreviations of the given SI base unit is incorrect?

At a pressure of one billionth (10-9) of atmospheric pressure, there are about 2.7 × 1010 molecules in one cubic centimeter of a gas. How many molecules is this per cubic meter?

Which of the following correctly shows how to convert a density of 20.1 g cm-3 to units of kg m-3?

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?

Which of the following abbreviations of the given SI base unit is incorrect?

Talc is a mineral that has low conductivity for heat and electricity and that is not attacked by acid. It is used as talcum powder and face powder. A sample of talc weighs 35.97 g in air and 13.65 g in mineral oil (d = 1.75 g/cm3) . What is the density of talc?

The SI prefix mega- (M) means

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?

If the density of a certain spherical atomic nucleus is 1.0 × 10¹⁴ g cm^-3 and its mass is 2.0 × 10^-23 g, what is its radius in cm?

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

The area of a 15-inch pizza is 176.7 in². Express this area in square centimeters.

The joule is the SI unit of energy and is equal to 1 kg m² s^-2. The erg is another energy unit, equal to 1 g cm² s^-2. Use unit conversion methods to work out how many ergs are in 1 joule.

At a pressure of one billionth (10^-9) of atmospheric pressure, there are about 2.7 × 10¹⁰ molecules in one cubic centimeter of a gas. How many molecules is this per cubic meter?

Which of the following correctly shows how to convert a density of 20.1 g cm^-3 to units of kg m^-3?

Talc is a mineral that has low conductivity for heat and electricity and that is not attacked by acid. It is used as talcum powder and face powder. A sample of talc weighs 35.97 g in air and 13.65 g in mineral oil (d = 1.75 g/cm³) . What is the density of talc?