Q: A patient receives an intravenous dose of 250 mg of a drug. How many micrograms is this?

$$2.5 \times 10^5$ \ \mathrm{\mu g}$$

Question 1

A hospital pharmacist needs to prepare 500 mL of a saline solution. If the density of the solution is $$1.05 \ \mathrm{g/mL}$$, what is the mass of the solution in kilograms?

Accepted Answer

$$0.525 \ \mathrm{kg}$$

Question 2

A patient receives an intravenous dose of 250 mg of a drug. How many micrograms is this?

Accepted Answer

$$2.5 	imes 10^5$ \ \mathrm{\mu g}$$

Question 3

A sample of gold has a mass of $$96.5 \ \mathrm{g}$$ and a volume of $$5.00 \ \mathrm{mL}. $$What is the density of gold in $$\mathrm{g/mL}$$?

Accepted Answer

$$19.3 \ \mathrm{g/mL}$$

Question 4

A nurse needs to convert a patient's temperature from $$39.0^\circ \mathrm{C} to $$Fahrenheit. What is the temperature in $$^\circ \mathrm{F}$$? (Use $$^\circ \mathrm{F} = \dfrac{9}{5} 	imes ^\circ \mathrm{C} + 32)$$

Accepted Answer

$$102.2^\circ \mathrm{F}$$

Question 5

A 50.0 g sample of water is heated from $$20.0^\circ \mathrm{C} to$$ $$80.0^\circ \mathrm{C}. If $$the specific heat of water is $$1.00 \ \mathrm{cal/g}^\circ \mathrm{C}$$, how many calories are absorbed?

Accepted Answer

$$3,000 \ \mathrm{cal}$$

Question 6

Which of the following best describes a chemical change occurring in the kitchen?

Accepted Answer

Baking bread in the oven

Question 7

A student records the following measurements: $$0.00450 \ \mathrm{g}$$, $$0.0450 \ \mathrm{g}$$, and $$0.450 \ \mathrm{g}. $$Which measurement has three significant figures?

Accepted Answer

$$0.450 \ \mathrm{g}$$

Question 8

A piece of metal with a mass of $$75.0 \ \mathrm{g} is $$placed in a graduated cylinder containing $$25.0 \ \mathrm{mL} of $$water. The water level rises to $$35.5 \ \mathrm{mL}. $$What is the density of the metal?

Accepted Answer

$$7.14 \ \mathrm{g/mL}$$

Question 9

Which of the following elements is a metalloid and is commonly used in computer chips due to its semiconducting properties?

Accepted Answer

Silicon

Question 10

A nutrition label states that a snack contains 8 g of fat, 24 g of carbohydrate, and 4 g of protein. Using $$9 \ \mathrm{kcal/g}$$ for fat, $$4 \ \mathrm{kcal/g}$$ for carbohydrate, and $$4 \ \mathrm{kcal/g}$$ for protein, what is the total caloric content?

Accepted Answer

$$164 \ \mathrm{kcal}$$

Question 11

Which of the following statements about the periodic table is correct?

Accepted Answer

Elements in the same group have similar chemical properties.

Question 12

A neutral atom has 17 protons, 18 neutrons, and 17 electrons. What is its mass number?

Accepted Answer

$$35$$

Question 13

Which of the following is a property of a solid?

Accepted Answer

Particles have fixed positions and are very close together.

Question 14

A sample of gas is at $$-196^\circ \mathrm{C}. $$What is the temperature in Kelvin? (Use $$K = ^\circ \mathrm{C} + 273)$$

Accepted Answer

$$77 \ \mathrm{K}$$

Question 15

Which of the following best describes the arrangement of electrons in a neutral atom of aluminum?

Accepted Answer

$$2,8,3$$

Question 16

A solution has a density of $$1.25 \ \mathrm{g/mL}. $$What is its specific gravity?

Accepted Answer

$$1.25$$

Question 17

Which of the following is NOT a physical change?

Accepted Answer

Burning gasoline in a lawnmower

Question 18

A neutral atom of sodium has a mass number of 25. How many neutrons does it have?

Accepted Answer

$$14$$

Question 19

Which of the following best describes valence electrons?

Accepted Answer

They are located in the outermost energy level of an atom.

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