Question 1

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

Accepted Answer

Rusting of iron

Question 2

A sample of gold has a mass of 96.5 g and a volume of 5.00 cm$$^3. $$What is the density of gold? (Use $$	ext{Density} = \frac{	ext{Mass}}{	ext{Volume}})$$

Accepted Answer

$$19.3\ 	ext{g/cm}^3$$

Question 3

Which of the following is a physical property?

Accepted Answer

Boiling point

Question 4

Convert 0.0056 kilometers to centimeters. (1 km = $$10^5 cm)$$

Accepted Answer

$$560\ 	ext{cm}$$

Question 5

How many significant figures are in the measurement 0.00450 g?

Accepted Answer

3

Question 6

Which of the following is a mixture?

Accepted Answer

Air

Question 7

A student measures the temperature of a solution as 25.0 $$^	ext{o}C. $$What is this temperature in Kelvin? (Use $$K = ^	ext{o}C + 273.15)$$

Accepted Answer

$$298.15\ K$$

Question 8

Which of the following is a pure substance?

Accepted Answer

Oxygen gas (O$$_2)$$

Question 9

When multiplying 2.5 (2 significant figures) by 3.42 (3 significant figures), how many significant figures should the answer have?

Accepted Answer

2

Question 10

Which of the following statements best describes a chemical property?

Accepted Answer

The ability of iron to react with oxygen to form rust

Question 11

A piece of metal has a mass of 13.5 g and displaces 5.0 mL of water. What is its density? (Use $$	ext{Density} = \frac{	ext{Mass}}{	ext{Volume}})$$

Accepted Answer

$$2.7\ 	ext{g/mL}$$

Question 12

Which of the following is NOT a physical change?

Accepted Answer

Burning of gasoline

Question 13

Convert 250 milligrams to grams. (1 g = 1000 mg)

Accepted Answer

$$0.25\ 	ext{g}$$

Question 14

Which of the following is a heterogeneous mixture?

Accepted Answer

Sand and iron filings

Question 15

A patient’s fever is measured at 102.2 $$^	ext{o}F. $$What is this temperature in Celsius? (Use $$^	ext{o}C = (^	ext{o}F - 32) 	imes \frac{5}{9})$$

Accepted Answer

$$39.0\ ^	ext{o}C$$

Ch. 1 Study Notes: Matter and Measurements

Guida di studio - Domande di pratica

Study guide - Flashcard