Question 1

Which of the following best describes a compound?

Accepted Answer

A substance composed of two or more different kinds of elements in a fixed ratio.

Question 2

Which of the following is an example of an intensive property?

Accepted Answer

Density

Question 3

A student measures the mass of a sample as 12.345 g and its volume as 6.7 mL. What is the density of the sample, reported with the correct number of significant figures?

Accepted Answer

$$1.8\ \mathrm{g/mL}$$

Question 4

Which separation technique would be most appropriate to separate a mixture of sand and salt water?

Accepted Answer

Filtration

Question 5

Which of the following is a chemical property?

Accepted Answer

Reactivity with acid

Question 6

Convert $$25.0\ ^\circ\mathrm{C} to $$Kelvin.

Accepted Answer

$$298.2\ \mathrm{K}$$

Question 7

Which of the following statements about mixtures is correct?

Accepted Answer

A homogeneous mixture is also called a solution.

Question 8

A sample of water is heated from $$20.0\ ^\circ\mathrm{C} to$$ $$68.0\ ^\circ\mathrm{C}. $$What is the temperature change in Kelvin?

Accepted Answer

$$48.0\ \mathrm{K}$$

Question 9

Which of the following is NOT a base SI unit?

Accepted Answer

Liter

Question 10

A measurement is recorded as $$0.004560 g. $$How many significant figures does this value have?

Accepted Answer

4

Question 11

Which of the following best describes the Law of Constant Composition?

Accepted Answer

A compound always contains the same proportion of elements by mass.

Question 12

Which of the following is an example of a physical change?

Accepted Answer

Melting of ice

Question 13

A student needs to convert $$5.00$$ inches to centimeters. Which conversion factor should be used?

Accepted Answer

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

Question 14

Which of the following best describes accuracy in scientific measurements?

Accepted Answer

The closeness of a measurement to the true value.

Question 15

A solution is prepared by dissolving $$10.0 g of $$NaCl in $$90.0 g of $$water. Which term best describes this mixture?

Accepted Answer

Homogeneous mixture

Question 16

Which of the following is the correct formula for density?

Accepted Answer

$$D = m/V$$

Question 17

A laboratory thermometer reads $$77.0\ ^\circ\mathrm{F}. $$What is this temperature in Celsius?

Accepted Answer

$$25.0\ ^\circ\mathrm{C}$$

Question 18

Which of the following is an example of a heterogeneous mixture?

Accepted Answer

Salad with lettuce, tomatoes, and cucumbers

Question 19

Which of the following is a derived SI unit?

Accepted Answer

Liter

Question 20

A student records the following measurements for the mass of a sample: $$2.01 g$$, $$2.03 g$$, $$2.02 g$$, $$2.00 g. $$The true mass is $$2.50 g. $$Which statement is correct?

Accepted Answer

The measurements are precise but not accurate.

Chapter 1: Introduction to Matter, Energy, and Measurement – General Chemistry Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard