Q: Which of the following is the correct formula for density?

$$\text{Density} = \dfrac{\text{mass}}{\text{volume}}$$

Question 1

Which of the following statements best describes the difference between qualitative and quantitative measurements in chemistry?

Accepted Answer

Qualitative measurements are descriptive observations, while quantitative measurements involve numerical values obtained from instruments.

Question 2

A student measures the mass of a sample as 0.00430 g. How many significant figures does this measurement have?

Accepted Answer

4

Question 3

Which of the following is an example of an exact number in chemistry?

Accepted Answer

The number of centimeters in a meter

Question 4

Which temperature scale does NOT allow for negative values?

Accepted Answer

Kelvin

Question 5

Convert a body temperature of $$39.0\ ^\circ\mathrm{C} to $$Kelvin using the appropriate formula.

Accepted Answer

$$K = 39.0 + 273.15 = 312.15\ \mathrm{K}$$

Question 6

A graduated cylinder shows a meniscus between 4.5 and 4.6 mL. If the smallest division is 0.1 mL, what is the correct way to record the volume?

Accepted Answer

4.56 mL

Question 7

Which of the following best describes the difference between precision and accuracy?

Accepted Answer

Precision is how close repeated measurements are to each other, while accuracy is how close a measurement is to the true value.

Question 8

A sample of copper is heated from room temperature to $$100\ ^\circ\mathrm{C}. $$What happens to its density?

Accepted Answer

The density decreases because the sample expands.

Question 9

Which of the following is the correct formula for density?

Accepted Answer

$$	ext{Density} = \dfrac{	ext{mass}}{	ext{volume}}$$

Question 10

A 747 is fueled with $$173,231\ \mathrm{L} of $$jet fuel with a density of $$0.768\ \mathrm{g/cm^3$}. $$What is the mass of the fuel in kilograms? (1 L = 1000 cm³)

Accepted Answer

$$133,060\ \mathrm{kg}$$

Question 11

Which of the following best describes an exothermic process?

Accepted Answer

The system loses heat to the surroundings and the energy of the system decreases.

Question 12

Which of the following is the correct conversion factor to convert inches to centimeters?

Accepted Answer

$$\dfrac{2.54\ \mathrm{cm}}{1\ \mathrm{in}}$$

Question 13

A vineyard has 145 acres of Chardonnay grapes. If a soil supplement requires $$5.50\ \mathrm{g}$$ for every square meter, how many kilograms are needed for the entire vineyard? (1 acre = 4046.86 m²)

Accepted Answer

$$3,220\ \mathrm{kg}$$

Question 14

Which of the following is the correct relationship for converting Celsius to Fahrenheit?

Accepted Answer

$$F = (C 	imes 1.8) + 32$$

Question 15

Which of the following is an intensive property?

Accepted Answer

Density

Question 16

A canister contains $$1.45\ \mathrm{L} of $$white gas with a density of $$0.710\ \mathrm{g/cm^3$}. $$What is the mass of the fuel in kilograms?

Accepted Answer

$$1.03\ \mathrm{kg}$$

Question 17

Which of the following best describes the First Law of Thermodynamics?

Accepted Answer

Energy of the universe is conserved.

Question 18

Which of the following is the correct definition of a calorie?

Accepted Answer

The amount of heat needed to raise the temperature of 1 gram of water by 1 Celsius degree.

Essentials: Units, Measurements, and Problem Solving (General Chemistry Study Notes)

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