Question 1

Which of the following best describes the difference between a compound and a mixture?

Accepted Answer

A compound consists of two or more elements chemically combined in a fixed ratio, while a mixture consists of two or more substances physically combined in variable proportions.

Question 2

A student measures the mass of a sample as 0.0250 g. How many significant figures are in this measurement?

Accepted Answer

4

Question 3

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

Accepted Answer

Density

Question 4

A sample of gold has a mass of 38.6 g and a volume of 2.00 cm$$^3. $$What is the density of gold in g/cm$$^3$$?

Accepted Answer

$$19.3$$

Question 5

Which separation technique would be most appropriate to separate a mixture of sand and salt water?

Accepted Answer

Filtration

Question 6

A temperature of $$25.0\ ^\circ\mathrm{C} is $$equivalent to what temperature in Kelvin?

Accepted Answer

$$298.2\ \mathrm{K}$$

Question 7

Which of the following statements about the scientific method is correct?

Accepted Answer

A hypothesis is a tentative explanation that can be tested by experiments.

Question 8

A solution of salt dissolved in water is best classified as:

Accepted Answer

A homogeneous mixture

Question 9

Which of the following is NOT classified as matter?

Accepted Answer

Sound

Question 10

A sample of a compound contains 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass, regardless of its source. This observation is an example of:

Accepted Answer

The law of constant composition

Question 11

Which of the following numbers contains exactly three significant figures?

Accepted Answer

3.40

Question 12

Which of the following is a chemical property?

Accepted Answer

Reactivity with oxygen

Question 13

A student adds 12.56 g of sugar to 100.0 mL of water. The resulting solution is best described as:

Accepted Answer

A homogeneous mixture

Question 14

Which of the following is an extensive property?

Accepted Answer

Volume

Question 15

A cube has an edge length of $$2.50\ \mathrm{cm}. $$What is its volume in $$\mathrm{cm}^3$$?

Accepted Answer

$$15.625\ \mathrm{cm}^3$$

Question 16

Which of the following best describes the process of distillation?

Accepted Answer

Separation based on differences in boiling points

Question 17

Convert $$0.750\ \mathrm{kg} to $$grams using dimensional analysis.

Accepted Answer

$$750\ \mathrm{g}$$

Question 18

Which of the following is a correct statement about accuracy and precision?

Accepted Answer

Precision refers to how close measurements are to each other, while accuracy refers to how close measurements are to the true value.

Question 19

A student records the following measurements: $$2.45\ \mathrm{cm}$$, $$2.47\ \mathrm{cm}$$, $$2.46\ \mathrm{cm}. $$The true value is $$2.90\ \mathrm{cm}. $$Which statement is correct?

Accepted Answer

The measurements are precise but not accurate.

Question 20

Which of the following is a physical change?

Accepted Answer

Melting of ice

Introduction to Matter, Measurement, and Scientific Method: General Chemistry I Study Notes

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