Q: A patient receives 2.0 L of IV fluid over 18 hours. The drop factor is 20 gtt/mL. What is the drop rate in drops per minute (gtt/min)?

$$\frac{2000\text{ mL}\times20\text{ gtt/mL}}{18\times60\text{ min}}=37$$ gtt/min

Q: Calculate the density in g/mL of 2.0 L of gasoline that weighs 1.32 kg.

$$\frac{1320\text{ g}}{2000\text{ mL}}=0.66\text{ g/mL}$$

Q: A tablet of Benadryl™ has a mass of 0.50 g and contains 25 mg of active ingredient. What percent of the tablet is active ingredient?

$$\frac{25\text{ mg}}{500\text{ mg}}\times100=5\%$$

Q: Convert -112°F to Kelvin.

$$K = \frac{-112-32}{1.8} + 273 = 190\text{ K}$$

Question 1

Which of the following is a pure substance?

Accepted Answer

Copper metal

Question 2

Which statement best describes a homogeneous mixture?

Accepted Answer

Its composition is the same throughout the sample.

Question 3

Which of the following is an element?

Accepted Answer

Fe

Question 4

How many atoms of oxygen are present in one molecule of aspartame, C$$_{14}H$_{18}N$_2O$_5$$?

Accepted Answer

5

Question 5

Which of the following changes is a chemical change?

Accepted Answer

Milk spoiling and becoming sour

Question 6

A measurement is recorded as 0.000068 g. How many significant figures does this measurement have?

Accepted Answer

6

Question 7

Which of the following is the correct rule for determining the number of significant figures in the result of a multiplication?

Accepted Answer

Match the least number of significant figures in the measured numbers.

Question 8

Express 0.36 as a percent with two significant figures.

Accepted Answer

$$0.36	imes100=36\%$$

Question 9

A patient receives 2.0 L of IV fluid over 18 hours. The drop factor is 20 gtt/mL. What is the drop rate in drops per minute (gtt/min)?

Accepted Answer

$$\frac{2000	ext{ mL}	imes20	ext{ gtt/mL}}{18	imes60	ext{ min}}=37$$ gtt/min

Question 10

Which of the following best describes the state of matter for a liquid?

Accepted Answer

It has a definite volume but takes the shape of its container.

Question 11

Calculate the density in g/mL of 2.0 L of gasoline that weighs 1.32 kg.

Accepted Answer

$$\frac{1320	ext{ g}}{2000	ext{ mL}}=0.66	ext{ g/mL}$$

Question 12

A tablet of Benadryl™ has a mass of 0.50 g and contains 25 mg of active ingredient. What percent of the tablet is active ingredient?

Accepted Answer

$$\frac{25	ext{ mg}}{500	ext{ mg}}	imes100=5\%$$

Question 13

Which of the following best describes accuracy in scientific measurement?

Accepted Answer

Obtaining results that are close to the actual value.

Question 14

Convert -112°F to Kelvin.

Accepted Answer

$$K = \frac{-112-32}{1.8} + 273 = 190	ext{ K}$$

Question 15

A person's urine has a specific gravity of 1.002. What does this indicate?

Accepted Answer

The person is likely overhydrated.

Question 16

Which of the following is NOT a property of a solid?

Accepted Answer

Particles are far apart and do not interact.

Question 17

Which of the following is a transition element?

Accepted Answer

Fe

Question 18

A 38-lb child is prescribed acyclovir for chicken pox at 80 mg/kg/day, divided into four doses. Each tablet contains 700 mg. How many tablets should be given per dose?

Accepted Answer

$$\frac{38	ext{ lb}	imes0.454	ext{ kg/lb}	imes80	ext{ mg/kg}}{4	imes700	ext{ mg}}=0.62$$ tablets per dose

Chapter 1: Chemistry Basics – Matter & Measurement Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard