Question 1

Which of the following best describes the change that occurs when dry ice (solid CO$$_2) $$sublimes into gaseous CO$$_2 as $$shown in the images above?

Accepted Answer

A physical change, because the CO$$_2$$ molecules remain unchanged.

Question 2

A student measures the mass of a coin as shown in the image above. What is the correct number of significant figures in the measurement 5.01 g?

Accepted Answer

3 significant figures

Question 3

Which of the following is an example of a homogeneous mixture, based on the classification diagram provided?

Accepted Answer

Tea with sugar

Question 4

A chemist finds that 25.00 cm$$^3 of an $$unknown liquid has a mass of 19.625 g at 20$$^	ext{o}C. $$Using the density table provided, what is the most likely identity of the liquid?

Accepted Answer

Toluene

Question 5

Which of the following statements about the boiling of water is correct, as illustrated in the images?

Accepted Answer

Boiling water is a physical change because the H$$_2O $$molecules remain unchanged.

Question 6

Convert 381 grams to pounds. (1 lb = 454 g)

Accepted Answer

$$0.840 lb$$

Question 7

A 747 is fueled with 173,231 L of jet fuel. If the density of the fuel is $$0.768 \ \mathrm{g/cm^3$}$$, what is the mass of the fuel in kilograms?

Accepted Answer

$$1.33 	imes 10^5$ kg

Question 8

Which of the following is an intensive property?

Accepted Answer

Density

Question 9

A solution contains 30.00% potassium iodide salt by mass. How many grams of potassium iodide salt are in 40.0 g of solution?

Accepted Answer

$$12.0 g$$

Question 10

Which of the following best describes the process of rusting, as shown in the image of the iron nail?

Accepted Answer

A chemical change, because iron reacts with oxygen to form a new substance.

Question 11

A runner covers a distance of 7.5 km at a pace of 65 meters per minute. How many minutes does it take to complete the distance?

Accepted Answer

$$115$$ min

Question 12

Which of the following is the correct scientific notation for the number 0.00051274?

Accepted Answer

$$5.1274 	imes 10$$^{-4}$$

Question 13

A sample of water is decomposed into hydrogen and oxygen. If 100.0 g of water produces 11.1 g of hydrogen, how much oxygen is produced?

Accepted Answer

$$88.9 g$$

Question 14

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

Accepted Answer

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

Question 15

A student adds 12.5 + 3.269 - 5.12. According to the rules for significant figures in addition/subtraction, what is the correct answer?

Accepted Answer

$$10.6$$

Question 16

Which of the following is the correct conversion factor for converting square inches to square centimeters?

Accepted Answer

$$1 \ \mathrm{in}^2 = 6.45 \ \mathrm{cm}^2$$

Question 17

A 350 g sample of acetone (density $$0.788 \ \mathrm{g/mL}) is $$needed. What volume of acetone should be provided?

Accepted Answer

$$444 mL$$

Question 18

Which of the following is an example of a derived SI unit?

Accepted Answer

Liter (L)

Question 19

A solution contains 3.9 L of N$$_2 in 5.0 L of $$air. What is the percentage of N$$_2 in $$the air?

Accepted Answer

$$78\%$$

Question 20

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.

Chapter 1: Matter, Measurement, and Problem Solving – Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard