Question 1

Which of the following is an example of a chemical property?

Accepted Answer

Flammability

Question 2

A sample of seawater is best classified as which of the following?

Accepted Answer

Homogeneous mixture

Question 3

Which of the following statements about intensive and extensive properties is correct?

Accepted Answer

Density is an intensive property; mass is an extensive property.

Question 4

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

Accepted Answer

Filtration

Question 5

A student measures the mass of a metal sample as 24.56 g and its volume as 8.20 mL. What is the density of the metal, reported with the correct number of significant figures?

Accepted Answer

$$2.99 \ \mathrm{g/mL}$$

Question 6

Which of the following changes is a chemical change?

Accepted Answer

Iron rusting

Question 7

A compound always has:

Accepted Answer

A definite proportion of elements by mass

Question 8

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

Accepted Answer

Kelvin (K)

Question 9

A student records the following temperatures: 25.0 $$^\circC$$, 77.0 $$^\circF$$, and 298.2 K. Which two temperatures are closest in value?

Accepted Answer

25.0 $$^\circC $$and 77.0 $$^\circF$$

Question 10

Which of the following statements about significant figures is correct?

Accepted Answer

Zeros at the end of a number with a decimal point are significant.

Question 11

A chemist needs to convert 2.50 inches to centimeters. Given that $$1 \ \mathrm{in} = 2.54 \ \mathrm{cm}$$, what is the correct answer with the proper number of significant figures?

Accepted Answer

$$6.35 \ \mathrm{cm}$$

Question 12

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

Accepted Answer

Precision refers to how close measurements are to each other; accuracy refers to how close measurements are to the true value.

Question 13

A baseball (mass = 0.145 kg) is thrown at a velocity of 40.0 m/s. What is its kinetic energy?

Accepted Answer

$$116 \ \mathrm{J}$$

Question 14

Which of the following is a derived SI unit?

Accepted Answer

Joule (J)

Question 15

Which of the following is NOT a physical property?

Accepted Answer

Reactivity with acid

Question 16

A student mixes two colorless solutions and observes the formation of a blue precipitate. This observation is evidence of:

Accepted Answer

A chemical change

Question 17

Which of the following best describes a heterogeneous mixture?

Accepted Answer

A mixture with variable composition in different parts of the sample

Question 18

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

Accepted Answer

$$K = ^\circ C + 273.15$$

Question 19

A solution is best described as:

Accepted Answer

A homogeneous mixture

Chapter 1: Introduction to Matter, Energy, and Measurement

Guida di studio - Domande di pratica

Study guide - Flashcard