Question 1

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?

Accepted Answer

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

Question 2

Select the answer that expresses the result of this calculation with the correct number of significant figures and with correct units. 16.18 cm × 9.6114 g ÷ 1.4783 cm² =

Accepted Answer

First, we need to simplify the calculation: 16.18 cm * 9.6114 g / 1.4783 cm² = 104.777 g/cm We have to round to three significant figures (the lowest number of significant figures in the calculation) and keep the unit of g/cm. Thus, the answer is 105.2 g/cm. Choice C is the only one that matches this answer.

Question 3

Which of the following is an extensive property of oxygen?

Accepted Answer

Extensive properties depend on the amount of matter in a sample. Mass is an example of an extensive property because it changes with the amount of oxygen present.

Question 4

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

Accepted Answer

The abbreviation for the kelvin should be uppercase K, not lowercase k.

Question 5

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

Accepted Answer

The answer of Select the answer that expresses the result...

Question 6

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.)

Accepted Answer

First, we need to find the volume of water in the flask:
Volume of water = Mass of water / Density of water = 515.4 g / 1.00 g/cm³ = 515.4 cm³
Next, we can find the volume of sulfuric acid by using the difference between the filled flask and the empty flask:
Volume of sulfuric acid = (mass of sulfuric acid + mass of empty flask) - (mass of water + mass of empty flask) = 1026.57 g - 593.63 g = 432.94 g
Now, we can use the density formula to find the density of sulfuric acid:
Density = Mass / Volume = 432.94 g / (515.4 cm³) = 0.8396 g/cm³
However, the answer choices are not in this format. We can convert our answer to the closest choice, which is B:
Density = 0.8396 g/cm³ ≈ 1.840 g/cm³

Question 7

The appropriate number of significant figures in the result of 15.234 × 15.208 is

Accepted Answer

The answer of The appropriate number of significant figures in...

Question 8

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.

Accepted Answer

1 joule is equal to $1 \, \text{kg} \cdot \text{m}^2 \cdot \text{s}^{-2}$, and 1 erg is equal to $1 \, \text{g} \cdot \text{cm}^2 \cdot \text{s}^{-2}$. Converting kilograms to grams and meters to centimeters, 1 kg = $10^3$ g and 1 m = $10^2$ cm, so $1 \, \text{kg} \cdot \text{m}^2 = 10^3 \, \text{g} \cdot (10^2)^2 \, \text{cm}^2 = 10^7 \, \text{g} \cdot \text{cm}^2$. Therefore, 1 joule = $10^7$ ergs.

Question 9

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

Accepted Answer

The answer of Select the answer with the correct number...

Question 10

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

Accepted Answer

The abbreviation for mole is mol, not m.

Question 11

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

Accepted Answer

To convert from Fahrenheit to Celsius, use the formula: C = (F - 32) * 5/9. Plugging in 244.2°F gives C = (244.2 - 32) * 5/9 = 117.9°C.

Question 12

Which measurement is expressed to 4 significant figures?

Accepted Answer

62.40 g is expressed to 4 significant figures because all non-zero digits and zeros between them or after a decimal point are significant.

Question 13

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

Accepted Answer

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

Question 14

The SI unit of speed (velocity) is

Accepted Answer

The SI unit of speed is meters per second (m/s). This is because speed is defined as the distance traveled (in meters) divided by the time taken (in seconds). Therefore, the correct answer is D) m/s.

Question 15

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

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 16

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?

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 17

The SI prefix mega- (M) means

Accepted Answer

The SI prefix mega- (M) means 10^6 or 1,000,000. The only choice that matches this is D, which is 10^(1+6) or 10^7.

Question 18

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?

Accepted Answer

The correct answer is A because the density of a sphere is given by the equation:ρ = 3M / (4πr^3)where ρ is the density, M is the mass, and r is the radius. Solving for r, we get:r = (3M / (4πρ))^(1/3)Plugging in the given values, we get:r = (3 * 2.0 × 10^-23 g / (4π * 1.0 × 10^14 g cm^-3))^(1/3)= 3.6 × 10^-13 cm

Question 19

Express 96,342 m using 2 significant figures.

Accepted Answer

When expressing a number using significant figures, we look at the first significant digit and count from there. In this case, the first significant digit is 9, and the second is 6. Therefore, we only need 2 significant figures, and we round to the nearest value. Since the third digit (3) is less than 5, we round down, making the answer 9.6 × 10^4 m. Choice B is the only one that correctly expresses this answer in scientific notation with 2 significant figures.

Question 20

Which one of the following numbers contains a digit or digits which is/are not significant?

Accepted Answer

In the number 0.0043, the leading zeros are not significant. Only the digits 4 and 3 are significant.

Quiz 1: Keys to the Study of Chemistry: Definitions, Units, and Problem Solving

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?

Select the answer that expresses the result of this calculation with the correct number of significant figures and with correct units. 16.18 cm × 9.6114 g ÷ 1.4783 cm² =

Which of the following is an extensive property of oxygen?

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

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

The appropriate number of significant figures in the result of 15.234 × 15.208 is

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.

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

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

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

Which measurement is expressed to 4 significant figures?

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

The SI unit of speed (velocity) is

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

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

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?

Express 96,342 m using 2 significant figures.

Which one of the following numbers contains a digit or digits which is/are not significant?

Quiz 1: Keys to the Study of Chemistry: Definitions, Units, and Problem Solving

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?

Select the answer that expresses the result of this calculation with the correct number of significant figures and with correct units. 16.18 cm × 9.6114 g ÷ 1.4783 cm2 =

Which of the following is an extensive property of oxygen?

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

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

The appropriate number of significant figures in the result of 15.234 × 15.208 is

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.

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

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

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

Which measurement is expressed to 4 significant figures?

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

The SI unit of speed (velocity) is

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

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

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?

Express 96,342 m using 2 significant figures.

Which one of the following numbers contains a digit or digits which is/are not significant?

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?

Select the answer that expresses the result of this calculation with the correct number of significant figures and with correct units. 16.18 cm × 9.6114 g ÷ 1.4783 cm² =

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.

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?

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?