Q: A block of iron measures 2.25 in. by 3.65 cm by 44.0 mm. The density of iron is $$7.86\ \mathrm{g/cm^3$}. $$What is the mass of the block in grams (rounded to the correct significant figures)?

$$7.22 \times 10^2$\ \mathrm{g}$$

Q: A person’s average daily intake of glucose is $$0.0833$$ lbs. What is this mass in milligrams? ($$1\ \mathrm{lb} = 453.6\ \mathrm{g})$$

$$3.78 \times 10^4$\ \mathrm{mg}$$

Q: The density of silver is $$10.5\ \mathrm{g/cm^3$}. $$Convert this density to $$\mathrm{kg/m^3$}.$$

$$1.05 \times 10^4$\ \mathrm{kg/m^3$}$$

Question 1

Which of the following best describes why chemistry is considered the 'central science'?

Accepted Answer

Because it connects and overlaps with many other scientific disciplines such as biology, physics, geology, and medicine.

Question 2

A student measures the mass of an object three times and gets values of 9.98 g, 10.01 g, and 10.02 g. The true mass is 10.00 g. Which statement best describes the measurements?

Accepted Answer

The measurements are both accurate and precise.

Question 3

How many significant figures are in the measurement 0.00120?

Accepted Answer

3

Question 4

Which of the following is an exact number?

Accepted Answer

The number of students in a classroom

Question 5

What is the result of $$5.02 	imes 89.665 	imes 0.10$$ rounded to the correct number of significant figures?

Accepted Answer

$$45$$

Question 6

Which of the following is the correct SI unit for measuring temperature?

Accepted Answer

Kelvin

Question 7

Convert 40.00 $$^\circC to $$Kelvin using the correct formula.

Accepted Answer

$$K = 40.00 + 273.15 = 313.15\ K$$

Question 8

A block of iron measures 2.25 in. by 3.65 cm by 44.0 mm. The density of iron is $$7.86\ \mathrm{g/cm^3$}. $$What is the mass of the block in grams (rounded to the correct significant figures)?

Accepted Answer

$$7.22 	imes 10^2$\ \mathrm{g}$$

Question 9

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

Accepted Answer

$$^\circ\mathrm{C} = \frac{(^\circ\mathrm{F} - 32)}{1.8}$$

Question 10

A person’s average daily intake of glucose is $$0.0833$$ lbs. What is this mass in milligrams? ($$1\ \mathrm{lb} = 453.6\ \mathrm{g})$$

Accepted Answer

$$3.78 	imes 10^4$\ \mathrm{mg}$$

Question 11

Which of the following statements about significant figures is correct?

Accepted Answer

Zeros after the decimal point and after figures are significant.

Question 12

Which of the following is the correct relationship between milliliters and cubic centimeters?

Accepted Answer

$$1\ \mathrm{mL} = 1\ \mathrm{cm^3$}$$

Question 13

The density of silver is $$10.5\ \mathrm{g/cm^3$}. $$Convert this density to $$\mathrm{kg/m^3$}.$$

Accepted Answer

$$1.05 	imes 10^4$\ \mathrm{kg/m^3$}$$

Question 14

Which of the following is a derived SI unit?

Accepted Answer

Cubic meter

Question 15

A container has a spherical shape with a diameter of $$4.50\ \mathrm{cm}. It is $$filled with liquid ethyl alcohol (density $$0.8205\ \mathrm{g/mL}). $$What is the mass of the liquid in milligrams (rounded to the correct significant figures)?

Accepted Answer

$$3.91 	imes 10^1$\ \mathrm{mg}$$

Question 16

Which of the following is NOT a base SI unit?

Accepted Answer

Liter

Question 17

Which of the following is the correct formula for the volume of a sphere?

Accepted Answer

$$V = \frac{4}{3}\pi r^3$

Question 18

Which of the following is the correct order of steps when performing calculations with both addition/subtraction and multiplication/division involving significant figures?

Accepted Answer

Do operations in parentheses first, evaluate significant figures in the intermediate answer, then do the remaining steps.

Matter, Measurement, and Problem Solving: Foundations of General Chemistry

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