Q: A sample of 14-karat gold has a mass of 1100 g and a volume of 85 mL. What is its density?

$$d = \frac{1100\,\text{g}}{85\,\text{mL}} = 12.9\,\text{g/mL}$$

Q: A doctor prescribes 7.5 mg acetaminophen per kg body weight per dose. How many milligrams should be given to a child who weighs 42 lb? (1 kg = 2.2 lb)

$$7.5\,\text{mg} \times \frac{42\,\text{lb}}{2.2\,\text{lb/kg}} = 143\,\text{mg}$$

Q: Which of the following is the correct conversion factor to convert milliliters (mL) to deciliters (dL)?

$$1\,\text{mL} = 0.01\,\text{dL}$$

Q: A solution contains 0.0040 L. How many microliters (mcL) is this?

$$0.0040 \times 10^6$ = 4000\,\text{mcL}$$

Question 1

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

Accepted Answer

Chocolate chip cookie

Question 2

Which statement best describes a compound?

Accepted Answer

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

Question 3

Which of the following is NOT a pure substance?

Accepted Answer

Laundry detergent

Question 4

A sample of 14-karat gold has a mass of 1100 g and a volume of 85 mL. What is its density?

Accepted Answer

$$d = \frac{1100\,	ext{g}}{85\,	ext{mL}} = 12.9\,	ext{g/mL}$$

Question 5

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 6

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

Accepted Answer

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

Question 7

A doctor prescribes 7.5 mg acetaminophen per kg body weight per dose. How many milligrams should be given to a child who weighs 42 lb? (1 kg = 2.2 lb)

Accepted Answer

$$7.5\,	ext{mg} 	imes \frac{42\,	ext{lb}}{2.2\,	ext{lb/kg}} = 143\,	ext{mg}$$

Question 8

Which of the following is the correct conversion factor to convert milliliters (mL) to deciliters (dL)?

Accepted Answer

$$1\,	ext{mL} = 0.01\,	ext{dL}$$

Question 9

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

Accepted Answer

Groups are vertical columns and periods are horizontal rows.

Question 10

A 5 mL sample of urine has a specific gravity of 1.025. What is its density?

Accepted Answer

$$1.025\,	ext{g/mL}$$

Question 11

Which of the following is the correct formula for converting Celsius to Kelvin?

Accepted Answer

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

Question 12

Which of the following best describes a physical change?

Accepted Answer

A change in the form of matter, but the identity remains the same

Question 13

Balance the following chemical equation: $$CH_4$$ + $$O_2$$ \rightarrow $$CO_2 + H_2O$

Accepted Answer

$$CH_4 + 2O_2$$ \rightarrow $$CO_2 + 2H_2O$

Question 14

How many significant figures are in the measurement 0.0550?

Accepted Answer

3

Question 15

Which of the following is the correct formula for density?

Accepted Answer

$$d = \frac{m}{V}$$

Question 16

A solution contains 0.0040 L. How many microliters (mcL) is this?

Accepted Answer

$$0.0040 	imes 10^6$ = 4000\,	ext{mcL}$$

Question 17

Which of the following is a correct statement about significant figures in calculations?

Accepted Answer

For multiplication and division, the answer should match the least number of significant digits.

Question 18

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

Accepted Answer

Iron

Question 19

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

Accepted Answer

Particles are far apart, move at high speeds, and have no definite arrangement

Chemistry Basics—Matter and Measurement: Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard