Q: Which of the following is the correct conversion factor to change kilometers to meters?

$$1 \text{ km} = 10^3$ \text{ m}$$

Q: A student needs to convert $$2.50 kg to $$pounds. Which conversion factor should be used?

$$1 \text{ kg} = 2.205 \text{ lb}$$

Q: Which of the following is the correct formula for calculating percent error?

$$\frac{\text{experimental value} - \text{actual value}}{\text{actual value}} \times 100\%$$

Question 1

Which of the following statements about significant figures is correct when multiplying or dividing measured values?

Accepted Answer

The answer should have as many significant figures as the number with the fewest significant figures.

Question 2

A student measures the mass of a metal block as 12.45 g and its volume as 3.1 cm$$^3. $$What is the density of the block, reported with the correct number of significant figures?

Accepted Answer

$$4.0 g/cm$^3$$

Question 3

Which of the following is the correct conversion factor to change kilometers to meters?

Accepted Answer

$$1 	ext{ km} = 10^3$ 	ext{ m}$$

Question 4

A temperature of $$25^\circC is $$equivalent to which temperature in Kelvin?

Accepted Answer

$$298 K$$

Question 5

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture in which the composition is uniform throughout.

Question 6

What is the correct scientific notation for the number $$0.00056$$?

Accepted Answer

$$5.6 	imes 10$$^{-4}$$

Question 7

A graduated cylinder contains $$45.6 mL of $$water. A metal object is added and the water level rises to $$52.3 mL. $$What is the volume of the metal object?

Accepted Answer

$$6.7 mL$$

Question 8

Which of the following is NOT a physical property of metals?

Accepted Answer

Brittleness

Question 9

A sample of liquid has a mass of $$25.0 g $$and a volume of $$19.8 mL. $$What is its density?

Accepted Answer

$$1.26 g/mL$$

Question 10

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

Accepted Answer

$$F = \frac{9}{5}C + 32$$

Question 11

A student needs to convert $$2.50 kg to $$pounds. Which conversion factor should be used?

Accepted Answer

$$1 	ext{ kg} = 2.205 	ext{ lb}$$

Question 12

Which of the following is a chemical property?

Accepted Answer

Ability to react with acid

Question 13

A solution contains $$5.0 g of $$NaCl in $$100 g of $$water. What is the percent by mass of NaCl in the solution?

Accepted Answer

$$5.0\%$$

Question 14

Which of the following is the correct definition of an isotope?

Accepted Answer

Atoms of the same element with different numbers of neutrons

Question 15

A sample of water is heated from $$20^\circC to$$ $$80^\circC. If $$the specific heat of water is $$4.18 J/g$\cdot$$°C and the mass is $$100 g$$, how much heat is absorbed?

Accepted Answer

$$25,080 J$$

Question 16

Which of the following is a correct statement about the atomic model after Rutherford's experiment?

Accepted Answer

Atoms have a dense, positively charged nucleus surrounded by electrons.

Question 17

Which of the following is the correct formula for calculating percent error?

Accepted Answer

$$\frac{	ext{experimental value} - 	ext{actual value}}{	ext{actual value}} 	imes 100\%$$

Question 18

Which of the following is a correct statement about the metric system?

Accepted Answer

The metric system is based on powers of ten.

Question 19

A student measures the length of a desk as $$1.25 m. $$How many centimeters is this?

Accepted Answer

$$125 cm$$

Question 20

Which of the following is the correct formula for the volume of a rectangular solid?

Accepted Answer

$$V = l 	imes w 	imes h$$

Measurement, Significant Figures, and Introduction to Matter in Chemistry

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