Question 1

Which of the following best describes the sample shown in image (a) of the first image (granite block)?

Accepted Answer

A heterogeneous mixture, because it contains visibly different components.

Question 2

Which of the following is a derived SI unit?

Accepted Answer

Liter (L)

Question 3

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

Accepted Answer

3

Question 4

Which of the following changes is a chemical change?

Accepted Answer

Rusting of iron

Question 5

Convert 2.44 meters to centimeters.

Accepted Answer

$$2.44 	imes 10^2$ cm

Question 6

A solution is prepared by dissolving 10.0 g of NaCl in 90.0 g of water. What is the mass percent of NaCl in the solution?

Accepted Answer

$$9.09\%$$

Question 7

Which of the following is an intensive property?

Accepted Answer

Density

Question 8

A sample of water is heated from ice at $$0^\circC to $$steam at $$100^\circC. $$Which of the following statements is true?

Accepted Answer

The arrangement of H$$_2O $$molecules changes, but the molecules themselves remain the same.

Question 9

What is the correct scientific notation for 0.00051274 rounded to three significant figures?

Accepted Answer

$$5.13 	imes 10$$^{-4}$$

Question 10

A chemist finds that 25.00 cm$$^3 of a $$liquid has a mass of 19.625 g at $$20^\circC. $$What is the density of the liquid?

Accepted Answer

$$0.785 g/cm$^3$$

Question 11

Which of the following is the correct conversion factor to convert from inches squared to centimeters squared?

Accepted Answer

$$(2.54)^2 cm$^2$$ $$= 1 in$^2$$

Question 12

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

$$133,060 kg$$

Question 13

Which of the following best describes the process shown in the image where propane gas burns?

Accepted Answer

A chemical change, because new substances are formed.

Question 14

A student adds 12.5 + 3.269 - 5.12. What is the answer with the correct number of decimal places?

Accepted Answer

$$10.6$$

Question 15

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

Accepted Answer

$$K = ^\circ C + 273.15$$

Question 16

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 17

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

Accepted Answer

Tea with sugar

Question 18

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 19

Which of the following is the correct scientific notation for 63,0179 rounded to four significant figures?

Accepted Answer

$$6.302 	imes 10^5$

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

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