Question 1

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture in which the composition is uniform throughout.

Question 2

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

Accepted Answer

Melting of ice to form liquid water.

Question 3

What is the correct chemical formula for a compound containing two hydrogen atoms and one oxygen atom?

Accepted Answer

$$\mathrm{H_2O}$$

Question 4

Which of the following statements about significant figures is TRUE?

Accepted Answer

All nonzero digits are always significant.

Question 5

A patient’s body temperature is measured as $$39.0\ ^\circ\mathrm{C}. $$What is this temperature in Kelvin?

Accepted Answer

$$312.2\ \mathrm{K}$$

Question 6

Which of the following is a correct conversion factor for converting milliliters to liters?

Accepted Answer

$$1\ \mathrm{L} = 1000\ \mathrm{mL}$$

Question 7

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?

Accepted Answer

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

Question 8

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

Accepted Answer

Accuracy refers to closeness to the true value, while precision refers to reproducibility of measurements.

Question 9

Which of the following is a chemical change?

Accepted Answer

Silver tarnishing when exposed to air.

Question 10

How many significant figures are in the measurement $$0.00450$$?

Accepted Answer

3

Question 11

Which of the following is the correct balanced chemical equation for the reaction of hydrogen gas with oxygen gas to form water?

Accepted Answer

$$2\mathrm{H_2$}(g) + \mathrm{O_2$}(g) \rightarrow 2\mathrm{H_2O}(l)$$

Question 12

A medication is prescribed at $$5.0\ \mathrm{mg/kg}$$ for a patient weighing $$70\ \mathrm{kg}. $$What is the total dose required?

Accepted Answer

$$350\ \mathrm{mg}$$

Question 13

Which of the following is a property of gases but not of solids or liquids?

Accepted Answer

Gases expand to fill the shape and volume of their container.

Question 14

Convert $$0.025 to a $$percent.

Accepted Answer

$$2.5\%$$

Question 15

Which of the following is an example of a compound?

Accepted Answer

Table salt ($$\mathrm{NaCl})$$

Question 16

A solution contains $$15\ \mathrm{g} of $$NaCl dissolved in $$150\ \mathrm{g} of $$water. What is the percent by mass of NaCl in the solution?

Accepted Answer

$$9.1\%$$

Question 17

Which of the following is the correct relationship between Celsius and Kelvin temperatures?

Accepted Answer

$$K = ^\circ C + 273$$

Question 18

Which of the following is a micronutrient essential for human health?

Accepted Answer

Iron

Question 19

What is the specific gravity of a liquid with a density of $$1.25\ \mathrm{g/mL} at$$ $$4\ ^\circ\mathrm{C}$$? (Density of water at $$4\ ^\circ\mathrm{C} is$$ $$1.00\ \mathrm{g/mL})$$

Accepted Answer

$$1.25$$

Chemistry Basics—Matter and Measurement: Study Guide for Chapter 1

Guida di studio - Domande di pratica

Study guide - Flashcard