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

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

Question 1

Which of the following best describes the change that occurs when dry ice (solid CO$$_2) $$sublimes directly into carbon dioxide gas?

Accepted Answer

A physical change, because the state changes but the chemical composition remains CO$$_2.$$

Question 2

A student measures the mass of a coin as 5.01 g. How many significant figures does this measurement have?

Accepted Answer

3

Question 3

Which of the following is a homogeneous mixture?

Accepted Answer

Sugar water

Question 4

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

Accepted Answer

$$0.840 lb$$

Question 5

Which of the following is an example of an intensive property?

Accepted Answer

Density

Question 6

A chemist finds that 25.00 cm$$^3 of an $$unknown liquid has a mass of 19.625 g at 20$$^	ext{o}C. $$What is the density of the liquid?

Accepted Answer

$$0.785$$ $$g/cm^3$

Question 7

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

Accepted Answer

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

Question 8

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

Accepted Answer

$$133,100 kg$$

Question 9

Which of the following best describes the process of sugar dissolving in water?

Accepted Answer

A physical change, because the chemical composition of sugar remains unchanged.

Question 10

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 11

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

Accepted Answer

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

Question 12

A runner covers 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 13

Which of the following is a derived SI unit?

Accepted Answer

Liter

Question 14

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 15

Which of the following is the correct metric prefix for $$10^{-6}$$?

Accepted Answer

micro

Question 16

A cylinder made of pure iron has a height of 5.2 cm and a diameter of 4.8 cm. If the density of iron is $$7.874 g/cm$^3$$, what is the mass of the cylinder? (Use $$V = \pi r^2$ h)$$

Accepted Answer

$$767 g$$

Question 17

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 18

Which of the following is the correct number of significant figures in the measurement 0.050080 g?

Accepted Answer

5

Question 19

A solution contains 80.0 g of potassium iodide salt. If the solution is 30.00% potassium iodide by mass, what is the total mass of the solution?

Accepted Answer

$$267 g$$

Question 20

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

Accepted Answer

$$1 	ext{ in}^2 = 6.45 	ext{ cm}^2$$

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

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