Q: Which of the following is the correct conversion factor to change inches to centimeters?

$$1\ \text{in} = 2.54\ \text{cm}$$

Q: A graduated cylinder contains 15.0 mL of water. A metal object is added, raising the water level to 18.5 mL. If the mass of the object is 9.25 g, what is its density?

$$D = \frac{9.25\ \text{g}}{3.5\ \text{mL}} = 2.64\ \text{g/mL}$$

Q: A sample of honey has a density of $$1.420\ \text{g/mL}. $$What is the mass of $$250.0\ \text{mL} of $$honey?

$$m = 250.0\ \text{mL} \times 1.420\ \text{g/mL} = 355.0\ \text{g}$$

Q: A student needs to convert 5.00 miles to kilometers. Given $$1\ \text{mile} = 1.609\ \text{km}$$, what is the correct answer with proper significant figures?

$$5.00\ \text{miles} \times 1.609\ \text{km/mile} = 8.05\ \text{km}$$

Question 1

Which of the following best describes an intensive property, and which is an example of it?

Accepted Answer

A property that does not depend on the amount of substance present; for example, density.

Question 2

A student measures the mass of a sample three times and gets values of 8.21 g, 8.22 g, and 8.20 g. The true mass is 8.50 g. Which statement best describes the measurements?

Accepted Answer

The measurements are precise but not accurate.

Question 3

Which of the following is a chemical change?

Accepted Answer

Burning of a match.

Question 4

A solution of salt water is an example of which classification of matter?

Accepted Answer

Homogeneous mixture

Question 5

Which of the following correctly expresses the density equation in LaTeX format?

Accepted Answer

$$D = \frac{m}{v}$$

Question 6

Convert 25.0 °C to Kelvin. (Use the correct formula and significant figures.)

Accepted Answer

$$T_K = 25.0 + 273.15 = 298.2\ K$$

Question 7

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

Accepted Answer

$$1\ 	ext{in} = 2.54\ 	ext{cm}$$

Question 8

A graduated cylinder contains 15.0 mL of water. A metal object is added, raising the water level to 18.5 mL. If the mass of the object is 9.25 g, what is its density?

Accepted Answer

$$D = \frac{9.25\ 	ext{g}}{3.5\ 	ext{mL}} = 2.64\ 	ext{g/mL}$$

Question 9

Which of the following numbers has four significant figures?

Accepted Answer

$$1.030 	imes 10^4$

Question 10

A sample of honey has a density of $$1.420\ 	ext{g/mL}. $$What is the mass of $$250.0\ 	ext{mL} of $$honey?

Accepted Answer

$$m = 250.0\ 	ext{mL} 	imes 1.420\ 	ext{g/mL} = 355.0\ 	ext{g}$$

Question 11

Which of the following is a heterogeneous mixture?

Accepted Answer

Oil and vinegar salad dressing

Question 12

Which of the following is the correct SI base unit for mass?

Accepted Answer

Kilogram (kg)

Question 13

A student needs to convert 5.00 miles to kilometers. Given $$1\ 	ext{mile} = 1.609\ 	ext{km}$$, what is the correct answer with proper significant figures?

Accepted Answer

$$5.00\ 	ext{miles} 	imes 1.609\ 	ext{km/mile} = 8.05\ 	ext{km}$$

Question 14

Which of the following best describes the law of constant composition?

Accepted Answer

The relative number of atoms of each element in a compound is the same in any sample.

Question 15

Which of the following is the correct formula to convert Fahrenheit to Celsius?

Accepted Answer

$$T^\circ C = \frac{5}{9}(T^\circ F - 32)$$

Question 16

A student records a measurement as 0.00450 g. How many significant figures does this value have?

Accepted Answer

3

Question 17

Which of the following is a derived SI unit?

Accepted Answer

Liter (L)

Question 18

A sample of oil has a mass of 45.0 g and a volume of 50.0 mL. Will the oil float on water (density = $$1.00\ 	ext{g/mL}$$)?

Accepted Answer

Yes, because its density is less than water.

Question 19

Which of the following is the correct way to read the volume of a liquid in a graduated cylinder?

Accepted Answer

At the bottom of the meniscus

Module 1: Introduction to Matter and Measurement – General Chemistry Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard