Question 1

Which of the following best describes the change that occurs when water boils, as shown in the image of the boiling kettle?

Accepted Answer

A physical change, because the composition of H$$_2O $$does not change.

Question 2

A student measures the mass of a coin as shown in the image. If the balance reads 5.01 g, how many significant figures should be reported?

Accepted Answer

3

Question 3

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

Accepted Answer

Tea with sugar

Question 4

Which of the following is a derived SI unit?

Accepted Answer

Liter (L)

Question 5

A sample of a liquid has a mass of 19.625 g and a volume of 25.00 cm$$^3. $$What is its density?

Accepted Answer

$$0.785\ \mathrm{g/cm^3$}$$

Question 6

Convert 2.44 meters to centimeters.

Accepted Answer

$$244\ \mathrm{cm}$$

Question 7

Which of the following is an intensive property?

Accepted Answer

Density

Question 8

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

Accepted Answer

$$12.0\ \mathrm{g}$$

Question 9

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

Accepted Answer

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

Question 10

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

Accepted Answer

$$133,100\ \mathrm{kg}$$

Question 11

Which metric prefix corresponds to $$10^{-6}$$?

Accepted Answer

Micro

Question 12

A student adds 12.5, 3.269, and subtracts 5.12. What is the answer with the correct number of decimal places?

Accepted Answer

$$10.6$$

Question 13

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

Accepted Answer

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

Question 14

A bug runs 36.0 inches in 1.32 seconds. How long would it take to run 1.00 mile at this rate? (1 mile = 5280 ft, 1 ft = 12 in)

Accepted Answer

$$2,640\ \mathrm{seconds}$$

Question 15

Which of the following best describes the process shown when sugar dissolves in water?

Accepted Answer

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

Question 16

If a measurement is both accurate and precise, which of the following is true?

Accepted Answer

The measurements are close to each other and to the true value.

Question 17

Which of the following is the correct conversion for 1.8 × 10$$^{-5} m $$using metric prefixes?

Accepted Answer

$$18\ \mu\mathrm{m}$$

Question 18

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

Accepted Answer

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

Question 19

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

Accepted Answer

$$444\ \mathrm{mL}$$

Question 20

Which of the following best describes the process of dry ice subliming?

Accepted Answer

A physical change, because the chemical composition of CO$$_2$$ remains unchanged.

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

Guida di studio - Domande di pratica