Identify the measured number(s), if any, in each of the following pairs of numbers: a. 5 pizzas and $50.0 \mathrm{~g}$ of cheese b. 6 nickels and $16 \mathrm{~g}$ of nickel c. 3 onions and $3 \mathrm{lb}$ of onions d. 5 miles and 5 cars

A total of $0.500 \mathrm{lb}$ of glass marbles is added to $425 \mathrm{~mL}$ of water. The water level rises to a volume of $528 \mathrm{~mL}$. What is the density $\left(\mathrm{g} / \mathrm{cm}^3\right)$ of the glass marbles?

Identify the numbers in each of the following statements as measured or exact:

a. A person weighs 155 lb.

b. The basket holds 8 apples.

c. In the metric system , 1 kg is equal to 1000 g.

d. The di tance from Denver, Colorado, to Houston , Texas , is 1720 km

Identify the number(s) in each of the following as measured or exact: a. A person weighs $67.5 \mathrm{~kg}$. b. The basket holds 8 apples. c. In the metric system, $1 \mathrm{~m}$ is equal to $1000 \mathrm{~mm}$. d. The distance from Denver, Colorado, to Houston, Texas, is $1720 \mathrm{~km}$.

Low-density lipoprotein (LDL), sometimes called "bad cholesterol," is also measured in a routine blood test. If a $0.380-\mathrm{g}$ sample of LDL has a volume of $0.362 \mathrm{~cm}^3$, what is the density of the LDL sample?

What is the estimated digit in each of the following measured numbers? a. $125.04 \mathrm{~g}$ b. $5.057 \mathrm{~m}$ c. $525.8^{\circ} \mathrm{C}$

Write each of the following as a standard number: a. $3.6 \times 10^{-5} \mathrm{~L}$ b. $8.75 \times 10^4 \mathrm{~cm}$ c. $3 \times 10^{-2} \mathrm{~mL}$ d. $2.12 \times 10^5 \mathrm{~kg}$

A 50.0-g silver object and a 50.0-g gold object are both added to $75.5 \mathrm{~mL}$ of water contained in a graduated cylinder. What is the new water level in the cylinder (see Table 2.9)?

In the manufacturing of computer chips, cylinders of silicon are cut into thin wafers that are $3.00 \mathrm{in}$. in diameter and have a mass of $1.50 \mathrm{~g}$ of silicon. How thick ( $\mathrm{mm}$ ) is each wafer if silicon has a density of $2.33 \mathrm{~g} / \mathrm{cm}^3$ ? (The volume of a cylinder is $\left.V=\pi r^2 h\right)$

In liposuction, a doctor removes fat deposits from a person's body. If body fat has a density of $0.94 \mathrm{~g} / \mathrm{mL}$ and $3.0 \mathrm{~L}$ of fat is removed, how many pounds of fat were removed from the patient? (2.8)

State the name of the unit and the type of measurement for each of the following: a. $4.8 \mathrm{~m}$ b. $325 \mathrm{~g}$ c. $1.5 \mathrm{~L}$ d. $480 \mathrm{~s}$ e. $28^{\circ} \mathrm{C}$

When three students use the same meterstick to measure the length of a paperclip, they obtain results of $5.8 \mathrm{~cm}, 5.75 \mathrm{~cm}$, and $5.76 \mathrm{~cm}$. If the meterstick has millimeter markings, what are some reasons for the different values? $(2.3,2.4)$

A package of aluminium foil is $66.7$ yd long, 12 in. wide, and $0.00030$ in. thick. If aluminium has a density of $2.70 \mathrm{~g} / \mathrm{cm}^3$, what is the mass, in grams, of the foil?

For a 180-lb person, calculate the quantity of each of the following that must be ingested to provide the $\mathrm{LD}_{50}$ for caffeine given in Table 2.8: $(2.6,2.7)$ a. cups of coffee if one cup is 12 fluid ounces and there is 100. mg of caffeine per $6 \mathrm{fl}$ oz of drip-brewed coffee b. cans of cola if one can contains 50 . mg of caffeine c. tablets of No-Doz if one tablet contains $100 . \mathrm{mg}$ of caffeine