Q: A food label lists the net weight as 15 oz (425 g). Which conversion factor would you use to convert ounces to grams for this product?

$$\frac{425\ \text{g}}{15\ \text{oz}}$$

Q: Which of the following equalities is considered exact and does NOT affect significant figures in calculations?

$$1\ \text{in.} = 2.54\ \text{cm}$$

Q: A patient is prescribed 2 capsules of Keflex, each containing 250 mg. How many milligrams of Keflex will the patient receive?

$$2 \times 250\ \text{mg} = 500\ \text{mg}$$

Q: If a car travels at 85 km/h, what conversion factor would you use to convert hours to kilometers?

$$\frac{85\ \text{km}}{1\ \text{h}}$$

Q: A jewelry piece contains 18% gold by mass. Which conversion factor would you use to find the mass of gold in 100 g of jewelry?

$$\frac{18\ \text{g gold}}{100\ \text{g jewelry}}$$

Q: Which equality would you use to convert 1 meter to millimeters?

$$1\ \text{m} = 1000\ \text{mm}$$

Q: A medication dosage is listed as 500 mg per tablet. If a patient needs 1.5 g of the medication, how many tablets should they take?

$$\frac{1.5\ \text{g}}{0.5\ \text{g/tablet}} = 3\ \text{tablets}$$

Q: Which conversion factor would you use to convert gallons to quarts?

$$\frac{4\ \text{qt}}{1\ \text{gal}}$$

Q: If a food label lists 5 oz (142 g), what is the conversion factor for grams to ounces?

$$\frac{5\ \text{oz}}{142\ \text{g}}$$

Q: Which equality would you use to convert 1 kilogram to pounds?

$$1\ \text{kg} = 2.20\ \text{lb}$$

Question 1

A food label lists the net weight as 15 oz (425 g). Which conversion factor would you use to convert ounces to grams for this product?

Accepted Answer

$$\frac{425\ 	ext{g}}{15\ 	ext{oz}}$$

Question 2

Which of the following equalities is considered exact and does NOT affect significant figures in calculations?

Accepted Answer

$$1\ 	ext{in.} = 2.54\ 	ext{cm}$$

Question 3

A patient is prescribed 2 capsules of Keflex, each containing 250 mg. How many milligrams of Keflex will the patient receive?

Accepted Answer

$$2 	imes 250\ 	ext{mg} = 500\ 	ext{mg}$$

Question 4

If a car travels at 85 km/h, what conversion factor would you use to convert hours to kilometers?

Accepted Answer

$$\frac{85\ 	ext{km}}{1\ 	ext{h}}$$

Question 5

A jewelry piece contains 18% gold by mass. Which conversion factor would you use to find the mass of gold in 100 g of jewelry?

Accepted Answer

$$\frac{18\ 	ext{g gold}}{100\ 	ext{g jewelry}}$$

Question 6

Which equality would you use to convert 1 meter to millimeters?

Accepted Answer

$$1\ 	ext{m} = 1000\ 	ext{mm}$$

Question 7

A medication dosage is listed as 500 mg per tablet. If a patient needs 1.5 g of the medication, how many tablets should they take?

Accepted Answer

$$\frac{1.5\ 	ext{g}}{0.5\ 	ext{g/tablet}} = 3\ 	ext{tablets}$$

Question 8

Which conversion factor would you use to convert gallons to quarts?

Accepted Answer

$$\frac{4\ 	ext{qt}}{1\ 	ext{gal}}$$

Question 9

If a food label lists 5 oz (142 g), what is the conversion factor for grams to ounces?

Accepted Answer

$$\frac{5\ 	ext{oz}}{142\ 	ext{g}}$$

Question 10

Which equality would you use to convert 1 kilogram to pounds?

Accepted Answer

$$1\ 	ext{kg} = 2.20\ 	ext{lb}$$

Question 11

A person has 18 kg of body fat and 100 kg of body mass. What is the percentage of body fat?

Accepted Answer

$$\frac{18\ 	ext{kg}}{100\ 	ext{kg}} 	imes 100\% = 18\%$$

Question 12

Which conversion factor would you use to convert minutes to seconds?

Accepted Answer

$$\frac{60\ 	ext{s}}{1\ 	ext{min}}$$

Question 13

A tablet contains 500 mg of vitamin C. If a patient needs 2 g of vitamin C, how many tablets should they take?

Accepted Answer

$$\frac{2\ 	ext{g}}{0.5\ 	ext{g/tablet}} = 4\ 	ext{tablets}$$

Question 14

Which conversion factor would you use to convert liters to milliliters?

Accepted Answer

$$\frac{1000\ 	ext{mL}}{1\ 	ext{L}}$$

Question 15

A car travels 170 km in 2 hours. What is its speed in km/h?

Accepted Answer

$$\frac{170\ 	ext{km}}{2\ 	ext{h}} = 85\ 	ext{km/h}$$

Question 16

Which conversion factor would you use to convert milligrams to micrograms?

Accepted Answer

$$\frac{1000\ \mu	ext{g}}{1\ 	ext{mg}}$$

Question 17

A gallon of gas costs $2.40. What is the conversion factor for dollars per gallon?

Accepted Answer

$$\frac{2.40\ 	ext{dollars}}{1\ 	ext{gal}}$$

Question 18

Which equality would you use to convert 1 meter to decimeters?

Accepted Answer

$$1\ 	ext{m} = 10\ 	ext{dm}$$

Unit Conversion and Equalities in Chemistry

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