Q: Which of the following is a correct conversion factor for changing 381 grams to pounds? ($$1 \text{ lb} = 453.6 \text{ g})$$

$$\frac{1 \text{ lb}}{453.6 \text{ g}}$$

Question 1

Which of the following best describes a chemical change?

Accepted Answer

Hydrogen gas reacting with oxygen to form water

Question 2

A student weighs a sample and records its mass as 3.00 g. The balance used is only accurate to the nearest 0.1 g. Which of the following best explains why this is incorrect?

Accepted Answer

The student should have recorded the mass as 3.0 g because only the first decimal place is significant.

Question 3

Which of the following is a correct statement about scientific theories?

Accepted Answer

A theory is a well-supported explanation that can be altered if new evidence arises.

Question 4

How many significant figures are in the measurement 0.004520?

Accepted Answer

5

Question 5

Which of the following is the correct answer for $$4.626 	imes 1.34$$ using significant figures?

Accepted Answer

$$6.20$$

Question 6

Convert 273,000 to scientific notation.

Accepted Answer

$$2.73 	imes 10^5$

Question 7

A patient needs 600 mg of a medication. The stock solution is 60 mg/mL. What volume should be administered?

Accepted Answer

$$10 mL$$

Question 8

Which of the following is NOT a base unit in the metric system?

Accepted Answer

inch (in)

Question 9

What is the density of a metal with a mass of 45.75 g and a volume of 6.95 mL?

Accepted Answer

$$6.59 g/mL$$

Question 10

Which of the following statements about specific gravity is correct?

Accepted Answer

Specific gravity is the ratio of the density of a substance to the density of water.

Question 11

Convert 1.844 gallons to milliliters (mL). ($$1 	ext{ gal} = 3.785 	ext{ L}$$, $$1 	ext{ L} = 1000 	ext{ mL})$$

Accepted Answer

$$6969 mL$$

Question 12

Which of the following is the correct metric prefix for $$10^{-3}$$?

Accepted Answer

milli-

Question 13

A sample of copper has a density of $$8.92 g/mL. $$What is its specific gravity?

Accepted Answer

$$8.92$$

Question 14

Which temperature scale is defined so that zero is the lowest possible temperature?

Accepted Answer

Kelvin

Question 15

Which of the following is a correct conversion factor for changing 381 grams to pounds? ($$1 	ext{ lb} = 453.6 	ext{ g})$$

Accepted Answer

$$\frac{1 	ext{ lb}}{453.6 	ext{ g}}$$

Question 16

Which of the following is the correct answer for $$3.147 + 2.52$$ using significant figures?

Accepted Answer

$$5.67$$

Question 17

Which of the following best describes a hypothesis?

Accepted Answer

A proposed explanation for an observation, not yet proven.

Question 18

Which of the following is the correct scientific notation for 0.0000391?

Accepted Answer

$$3.91 	imes 10$$^{-5}$$

Question 19

A nurse needs to prepare a solution by diluting 0.1627 L of a stock solution. How many significant figures should the answer have?

Accepted Answer

4

Question 20

Which of the following is a physical change?

Accepted Answer

Melting of ice

Chapters 1 & 2: Introduction to Chemistry and Measurements

Guida di studio - Domande di pratica

Study guide - Flashcard