Q: Which of the following conversion factors is correct for converting kilograms to grams?

$$1 \text{ kg} = 1000 \text{ g}$$

Q: Which of the following is the correct formula for density?

$$\text{Density} = \dfrac{\text{Mass}}{\text{Volume}}$$

Q: A large Saint Bernard dog weighs 218 lb. How many grams does the dog weigh? ($$1 \text{ lb} = 453.6 \text{ g})$$

$$9.89 \times 10$$^{4}$$ \text{ g}$$

Q: Which of the following is the correct relationship for converting Celsius to Fahrenheit?

$$\text{F} = (1.8 \times \text{C}) + 32$$

Q: Which of the following is the correct conversion factor for calories to joules?

$$1 \text{ cal} = 4.184 \text{ J}$$

Question 1

Which of the following statements best explains why the Mars Orbiter robotic probe was lost in 1999?

Accepted Answer

A calculation error occurred due to confusion between SI units and English units.

Question 2

A chemist measures the mass of a sample as 0.00320 g. How many significant figures does this measurement have?

Accepted Answer

4

Question 3

Which of the following is the correct scientific notation for the number 0.000215?

Accepted Answer

$$2.15 	imes 10$$^{-4}$$

Question 4

Which prefix represents $$10^{-6} in $$the metric system?

Accepted Answer

micro

Question 5

A graduated cylinder contains water at the 17.6 mL mark. How many significant figures should be recorded for this measurement?

Accepted Answer

3

Question 6

Which of the following conversion factors is correct for converting kilograms to grams?

Accepted Answer

$$1 	ext{ kg} = 1000 	ext{ g}$$

Question 7

A patient’s body temperature is measured as 38.0 °C. What is this temperature in Kelvin?

Accepted Answer

$$311.0 	ext{ K}$$

Question 8

Which of the following is the correct formula for density?

Accepted Answer

$$	ext{Density} = \dfrac{	ext{Mass}}{	ext{Volume}}$$

Question 9

A large Saint Bernard dog weighs 218 lb. How many grams does the dog weigh? ($$1 	ext{ lb} = 453.6 	ext{ g})$$

Accepted Answer

$$9.89 	imes 10$$^{4}$$ 	ext{ g}$$

Question 10

Which of the following statements about significant figures is TRUE?

Accepted Answer

Zeros between nonzero digits are significant.

Question 11

A sample has a mass of 12.5 g and a volume of 5.0 mL. What is its density?

Accepted Answer

$$2.5 	ext{ g/mL}$$

Question 12

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

Accepted Answer

$$	ext{F} = (1.8 	imes 	ext{C}) + 32$$

Question 13

A solution has a density of $$1.20 	ext{ g/mL}. $$What is its specific gravity?

Accepted Answer

$$1.20$$

Question 14

Which of the following is the correct conversion factor for calories to joules?

Accepted Answer

$$1 	ext{ cal} = 4.184 	ext{ J}$$

Question 15

A measurement is recorded as 4.5832 and needs to be rounded to two significant figures. What is the correct rounded value?

Accepted Answer

4.6

Question 16

Which laboratory equipment is most appropriate for measuring the volume of a liquid with high precision?

Accepted Answer

Graduated cylinder

Question 17

A student adds 0.01315 L of water to 3.1827 L already present. What is the correct sum, rounded according to significant figure rules for addition?

Accepted Answer

3.20 L

Question 18

Which of the following is NOT a base SI unit?

Accepted Answer

Liter (L)

Question 19

A sample is measured as 4200 g. How many significant figures does this measurement have?

Accepted Answer

It is ambiguous unless written in scientific notation.

Question 20

Which of the following statements about mass and weight is correct?

Accepted Answer

Mass is a measure of the amount of matter and does not depend on location.

Chap 1.2 Measurements, SI Units, and Significant Figures in Chemistry

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