Question 1

Which of the following is an example of a homogeneous mixture?

Accepted Answer

Brass (an alloy of copper and zinc)

Question 2

Which statement best describes a compound?

Accepted Answer

A pure substance made of two or more elements chemically joined together

Question 3

How many atoms of hydrogen are present in one molecule of water ($$\mathrm{H_2O}$$)?

Accepted Answer

Two

Question 4

Which of the following is a physical change?

Accepted Answer

Melting of ice

Question 5

What is the correct balanced chemical equation for the reaction of carbon and oxygen to form carbon dioxide?

Accepted Answer

$$\mathrm{C + O_2$ \rightarrow CO_2$}$$

Question 6

A sample has a mass of 25.0 g and a volume of 10.0 mL. What is its density?

Accepted Answer

$$2.50\ \mathrm{g/mL}$$

Question 7

Which of the following statements about significant figures is correct?

Accepted Answer

Zeros between nonzero digits are significant

Question 8

Convert 0.0250 L to milliliters (mL).

Accepted Answer

$$250\ \mathrm{mL}$$

Question 9

Which of the following is the correct scientific notation for 0.00056?

Accepted Answer

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

Question 10

A child is prescribed 60% of the adult dose of a medication. If the adult dose is 250 mg, what dose should the child receive?

Accepted Answer

$$150\ \mathrm{mg}$$

Question 11

Which of the following is NOT a macronutrient element required in quantities greater than 100 mg per day?

Accepted Answer

Iron

Question 12

What is the specific gravity of a liquid sample with a density of $$1.20\ \mathrm{g/mL}$$? (Density of water is $$1.00\ \mathrm{g/mL})$$

Accepted Answer

$$1.20$$

Question 13

Which temperature is equivalent to $$25.0\ ^\circ\mathrm{C} in $$Kelvin?

Accepted Answer

$$298.0\ \mathrm{K}$$

Question 14

A patient’s body temperature is measured at $$102.2\ ^\circ\mathrm{F}. $$What is this temperature in Celsius?

Accepted Answer

$$39.0\ ^\circ\mathrm{C}$$

Question 15

Which of the following best describes the arrangement and movement of particles in a gas?

Accepted Answer

Far apart, moving rapidly and randomly

Question 16

Which equation correctly relates energy units between calories and joules?

Accepted Answer

$$1\ \mathrm{cal} = 4.184\ \mathrm{J}$$

Question 17

A metal sample absorbs $$150.0\ \mathrm{J} of $$heat, causing its temperature to rise by $$10.0\ ^\circ\mathrm{C}. If $$the mass of the sample is $$25.0\ \mathrm{g}$$, what is its specific heat?

Accepted Answer

$$0.60\ \mathrm{J/g\ ^\circ C}$$

Question 18

Which of the following is an example of a chemical change?

Accepted Answer

Cooking an egg

Question 19

Which of the following best describes the difference between accuracy and precision?

Accepted Answer

Accuracy is how close measurements are to the true value; precision is how close measurements are to each other.

Question 20

A nurse needs to administer 500 mL of IV fluid over 4 hours. If the drop factor is 20 gtt/mL, what is the required drip rate in drops per minute?

Accepted Answer

42 gtt/min

Chapter 1: Chemistry Basics—Matter and Measurement (GOB Chemistry Study Notes)

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