Q: Express 0.000000120 m in scientific notation.

$$1.20 \times 10$$^{-7}$$\ \mathrm{m}$$

Q: Convert 8.91 \times $$10^5 m to $$centimeters.

$$8.91 \times 10^6$\ \mathrm{cm}$$

Q: What is the correct formula for calculating the amount of heat energy required to raise the temperature of a substance?

$$q = m \times C_s \times \Delta T$$

Q: Which of the following is the correct way to write 2730.78 m in scientific notation with the correct number of significant figures?

$$2.73078 \times 10^3$\ \mathrm{m}$$

Question 1

Which of the following best describes the difference between mass and weight?

Accepted Answer

Mass is the amount of matter in an object, while weight is the gravitational pull on that mass.

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 in g/cm$$^3$$?

Accepted Answer

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

Question 3

Which of the following is a heterogeneous mixture?

Accepted Answer

Chocolate chip cookies

Question 4

Express 0.000000120 m in scientific notation.

Accepted Answer

$$1.20 	imes 10$$^{-7}$$\ \mathrm{m}$$

Question 5

How many significant figures are in the measurement 0.00760 mL?

Accepted Answer

3

Question 6

Which of the following is a chemical property?

Accepted Answer

Iron rusts when exposed to oxygen.

Question 7

A patient requires a dose of 0.012 g of a painkiller available as a 15 mg/mL solution. How many milliliters should be administered?

Accepted Answer

$$0.80\ \mathrm{mL}$$

Question 8

Convert 8.91 	imes $$10^5 m to $$centimeters.

Accepted Answer

$$8.91 	imes 10^6$\ \mathrm{cm}$$

Question 9

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

Accepted Answer

Ice melting into water

Question 10

A 355 g can of soda is cooled from 25$$^ a0C to 5$^ a0C. $$Assuming the specific heat of soda is $$4.18\ \mathrm{J/g\ ^\circ C}$$, how much energy is removed?

Accepted Answer

$$29,600\ \mathrm{J}$$

Question 11

Which of the following statements about significant figures is correct?

Accepted Answer

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

Question 12

What is the correct formula for calculating the amount of heat energy required to raise the temperature of a substance?

Accepted Answer

$$q = m 	imes C_s 	imes \Delta T$$

Question 13

Which of the following is a derived unit?

Accepted Answer

Joule (J)

Question 14

A rectangular bar of lead measures 0.500 cm in height, 25.00 cm in length, and 5.50 cm in width and has a mass of 220.9 g. What is the density of lead in g/cm$$^3$$?

Accepted Answer

$$3.21\ \mathrm{g/cm^3$}$$

Question 15

Which of the following is a pure substance?

Accepted Answer

Nitrogen gas

Question 16

What is the correct conversion factor to change inches to centimeters?

Accepted Answer

$$1\ \mathrm{in} = 2.54\ \mathrm{cm}$$

Question 17

Which of the following is the correct way to write 2730.78 m in scientific notation with the correct number of significant figures?

Accepted Answer

$$2.73078 	imes 10^3$\ \mathrm{m}$$

Question 18

Which of the following is a correct statement about the scientific method?

Accepted Answer

It involves making observations, forming hypotheses, testing hypotheses, and developing theories.

Question 19

A student measures the volume of a liquid as 49.1 mL using a graduated cylinder. What is the correct way to report this measurement?

Accepted Answer

49.1 mL, estimating one more digit than the smallest marking

Chapter 1: Matter and Measurements – Study Notes for GOB Chemistry

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