Question 1

Which of the following best describes a compound?

Accepted Answer

A substance composed of atoms of two or more different elements chemically united in fixed proportions.

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 12.30 g and its volume as 4.10 mL. What is the density of the sample, and how many significant figures should the answer have?

Accepted Answer

$$D = \frac{12.30\ \mathrm{g}}{4.10\ \mathrm{mL}} = 3.00\ \mathrm{g/mL}$$, 3 significant figures

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

Flammability

Question 6

A sample of gold has a mass of 38.64 g and a volume of 2.00 cm$$^3. $$What is the density of gold in g/cm$$^3$$?

Accepted Answer

$$D = \frac{38.64\ \mathrm{g}}{2.00\ \mathrm{cm}^3} = 19.3\ \mathrm{g/cm}^3$$

Question 7

Which of the following is NOT a base SI unit?

Accepted Answer

Liter (L)

Question 8

Convert 25.0 °C to Kelvin.

Accepted Answer

$$K = 25.0 + 273.15 = 298.15\ \mathrm{K}$$

Question 9

Which of the following statements about mixtures is TRUE?

Accepted Answer

A homogeneous mixture is also called a solution.

Question 10

A student records the following measurements for the mass of a sample: 2.51 g, 2.50 g, 2.52 g, and 2.51 g. The true mass is 2.80 g. Which statement best describes the accuracy and precision of these measurements?

Accepted Answer

The measurements are precise but not accurate.

Question 11

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

Accepted Answer

Melting of ice

Question 12

Which of the following is the correct formula for kinetic energy?

Accepted Answer

$$KE = \frac{1}{2} m v^2$

Question 13

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

Accepted Answer

Granite

Question 14

How many significant figures are in the measurement 0.00450 g?

Accepted Answer

3

Question 15

Which of the following is a derived SI unit?

Accepted Answer

Liter (L)

Question 16

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

Accepted Answer

$$\frac{2.54\ \mathrm{cm}}{1\ \mathrm{in.}}$$

Question 17

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 18

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

Accepted Answer

$$^\circ\!F = \frac{9}{5}(^\circ\!C) + 32$$

Question 19

A solution is prepared by dissolving 10.0 g of table salt in 100.0 g of water. Which term best describes the resulting mixture?

Accepted Answer

Homogeneous mixture

Question 20

Which of the following is an example of a physical property that can be used to separate a mixture by distillation?

Accepted Answer

Boiling point

Chapter 1

Guida di studio - Domande di pratica

Study guide - Flashcard