Question 1

A laboratory sample has a mass of $$3.45 	imes 10$$^{-2}$$ grams. What is this mass in decimal notation?

Accepted Answer

$$0.0345$$ grams

Question 2

Convert $$0.00056 to $$scientific notation.

Accepted Answer

$$5.6 	imes 10$$^{-4}$$

Question 3

Which of the following correctly adds $$-\frac{3}{4}$$ and $$\frac{1}{2}$$?

Accepted Answer

$$-\frac{1}{4}$$

Question 4

A nurse needs to administer a medication at a dosage of $$5 \ \mathrm{mg/kg} to a $$patient who weighs $$70 \ \mathrm{kg}. $$What is the total dose required?

Accepted Answer

$$350 \ \mathrm{mg}$$

Question 5

A solution contains $$2.5 	imes 10$$^{3}$$ micrograms ($$\mu\mathrm{g}$$) of a drug. Convert this amount to milligrams ($$\mathrm{mg}$$).

Accepted Answer

$$2.5 mg$$

Question 6

How many significant digits are in the result of $$12.45 + 0.321$$?

Accepted Answer

2 decimal places

Question 7

A patient is prescribed $$0.5$$ grams of a medication. The available tablets are $$250 mg $$each. How many tablets should the patient take?

Accepted Answer

2 tablets

Question 8

Which of the following correctly expresses $$4.2 	imes 10$$^{5}$$ in decimal notation?

Accepted Answer

$$420,000$$

Question 9

A sample of water is heated from $$20.0^\circ \mathrm{C} to$$ $$45.0^\circ \mathrm{C}. If $$the mass of water is $$100.0 g $$and the specific heat capacity is $$4.18 \ \mathrm{J/g\cdot ^\circ C}$$, how much heat ($$q) is $$absorbed?

Accepted Answer

$$10,450 J$$

Question 10

Which SI prefix corresponds to a factor of $$10^{-6}$$?

Accepted Answer

micro ($$\mu)$$

Question 11

A doctor orders $$0.75 L of $$saline to be administered. How many milliliters is this?

Accepted Answer

$$750 mL$$

Question 12

A measurement is recorded as $$0.02030 g. $$How many significant digits does this value have?

Accepted Answer

4

Question 13

A patient weighing $$154 lb $$needs a medication dosed at $$2.0 mg/kg. (1 kg = 2.2 lb) $$What is the correct dose in mg?

Accepted Answer

$$140 mg$$

Question 14

Which calculation correctly multiplies $$0.003 by$$ $$10^4$$?

Accepted Answer

$$30$$

Question 15

A solution contains $$0.250 L. $$Express this volume in milliliters.

Accepted Answer

$$250 mL$$

Question 16

A patient receives $$500 mg of a $$drug every $$8$$ hours. How many grams does the patient receive in $$24$$ hours?

Accepted Answer

$$1.5 g$$

Question 17

If $$2.00 g of a $$substance at $$25.0^\circ \mathrm{C}$$ absorbs $$41.8 J of $$heat and its specific heat capacity is $$4.18 \ \mathrm{J/g\cdot ^\circ C}$$, what is the final temperature?

Accepted Answer

$$30.0^\circ \mathrm{C}$$

Question 18

Which of the following is the correct sum of $$1.23$$ and $$2.1$$, rounded to the correct number of significant digits?

Accepted Answer

$$3.3$$

Question 19

A medication is supplied as $$1.0 mg/mL. $$How many milliliters are needed to deliver a $$2.5 mg $$dose?

Accepted Answer

$$2.5 mL$$

Question 20

A student needs to convert $$0.045$$ kilometers to meters. What is the correct answer?

Accepted Answer

$$45$$ meters

Mathematical Operations and Measurement in GOB Chemistry

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