Q: Which of the following is the correct scientific notation for the mass of a bacterium: $$0.00000000000000000010\ \mathrm{kg}$$?

$$1.0 \times 10$$^{-19}$$\ \mathrm{kg}$$

Q: Convert $$3.70 \times 10^7$\ \mathrm{cm} to $$kilometers and express your answer in scientific notation.

$$3.70 \times 10^2$\ \mathrm{km}$$

Q: Which of the following is a correct metric prefix and its meaning?

1 millimeter = $$1 \times 10$$^{-3}$$ meters

Question 1

Which of the following best describes the difference between a compound and a mixture?

Accepted Answer

A compound consists of two or more elements chemically bonded in a fixed ratio, while a mixture consists of two or more substances physically combined in variable ratios.

Question 2

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

Accepted Answer

Melting of ice to form liquid water

Question 3

A student measures the mass of a gold bar as 150.0 g, 150.1 g, and 149.9 g in three trials. The actual mass is 160.0 g. Which statement is correct?

Accepted Answer

The measurements are precise but not accurate.

Question 4

Which of the following is a diatomic molecule that you must memorize for the exam?

Accepted Answer

$$\mathrm{O}_2$$

Question 5

Which of the following is an intensive property?

Accepted Answer

Density

Question 6

A sample of matter is uniform throughout and can be separated into its components by physical means. How should it be classified?

Accepted Answer

Homogeneous mixture (solution)

Question 7

Which of the following best describes kinetic energy in the context of chemistry?

Accepted Answer

Energy associated with the motion of particles

Question 8

Calculate the density of a ring if its mass is 16.48 g and its volume (by water displacement) is $$0.87\ \mathrm{mL}. $$Express your answer with the correct number of significant figures.

Accepted Answer

$$18.9\ \mathrm{g/mL}$$

Question 9

Which of the following is the correct scientific notation for the mass of a bacterium: $$0.00000000000000000010\ \mathrm{kg}$$?

Accepted Answer

$$1.0 	imes 10$$^{-19}$$\ \mathrm{kg}$$

Question 10

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

Accepted Answer

Filtration followed by evaporation

Question 11

Convert $$3.70 	imes 10^7$\ \mathrm{cm} to $$kilometers and express your answer in scientific notation.

Accepted Answer

$$3.70 	imes 10^2$\ \mathrm{km}$$

Question 12

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

Accepted Answer

Flammability

Question 13

A 0.25 lb baseball is thrown and possesses $$40\ \mathrm{J} of $$kinetic energy. What is its speed in $$\mathrm{m/s}$$? ($$1\ \mathrm{kg} = 2.2\ \mathrm{lb})$$

Accepted Answer

$$18.8\ \mathrm{m/s}$$

Question 14

Which of the following statements about significant figures is correct?

Accepted Answer

Zeros at the end of a number are significant if a decimal point is present.

Question 15

Which of the following is a correct metric prefix and its meaning?

Accepted Answer

1 millimeter = $$1 	imes 10$$^{-3}$$ meters

Question 16

Which of the following best describes the symbolic domain in chemistry?

Accepted Answer

It refers to the use of chemical symbols and formulas to represent substances and reactions.

Question 17

Which of the following is a pure substance?

Accepted Answer

Sugar ($$\mathrm{C}_{12}\mathrm{H}_{22}\mathrm{O}_{11})$$

Question 18

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

Accepted Answer

$$KE = \frac{1}{2}mv^2$

Question 19

A solution is prepared by dissolving sugar and salt in water. How would you classify this mixture?

Accepted Answer

Homogeneous mixture (solution)

Question 20

Which of the following is an example of a separation technique based on differences in boiling points?

Accepted Answer

Distillation

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

Guida di studio - Domande di pratica

Study guide - Flashcard