Question 1

Which of the following best describes the substance shown in the first image (Oxygen)?

Accepted Answer

A molecule composed of two oxygen atoms.

Question 2

Which of the following statements about significant figures is correct based on the second image?

Accepted Answer

Zeroes at the beginning of a number are not significant.

Question 3

Which of the following is an example of a physical property?

Accepted Answer

Density

Question 4

A student measures the mass of a sample as 5.340 g and its volume as 2.1 mL. What is the density of the sample, reported with the correct number of significant figures?

Accepted Answer

$$2.5 \ \mathrm{g/mL}$$

Question 5

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

Accepted Answer

Filtration

Question 6

Which of the following is an example of a chemical change?

Accepted Answer

Rusting of iron

Question 7

Convert $$120.0 \ ^\circ \mathrm{F} to $$Kelvin. (Use $$K = $$(^{\circ}$$F - 32) 	imes \frac{5}{9} + 273.15)$$

Accepted Answer

$$322.6 \ \mathrm{K}$$

Question 8

Which of the following is an intensive property?

Accepted Answer

Density

Question 9

A marathon is 26.2 miles long. How many inches is this? ($$1 \ \mathrm{mile} = 5280 \ \mathrm{ft}$$, $$1 \ \mathrm{ft} = 12 \ \mathrm{in})$$

Accepted Answer

$$1,380,096 \ \mathrm{in}$$

Question 10

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture that appears to be one substance with uniform composition.

Question 11

Which of the following is a correct statement about the law of conservation of mass?

Accepted Answer

Matter is neither created nor destroyed in a chemical reaction.

Question 12

A block measures $$7.36 \ \mathrm{cm}$$ long, $$5.23 \ \mathrm{cm}$$ wide, and $$1.2 \ \mathrm{cm}$$ thick. What is its volume, reported with the correct number of significant figures?

Accepted Answer

$$46.1 \ \mathrm{cm}^3$$

Question 13

Which of the following is a derived unit in the SI system?

Accepted Answer

Liter

Question 14

Which of the following best describes a scientific theory?

Accepted Answer

A model that explains why nature behaves as it does.

Question 15

Which of the following is an example of an exact number?

Accepted Answer

The number of students in a classroom.

Question 16

Which of the following is true about energy changes in chemical reactions?

Accepted Answer

Energy is always conserved in a chemical reaction.

Question 17

Which of the following is the correct rule for rounding when the last digit dropped is 5?

Accepted Answer

Always round up.

Question 18

Which of the following is a heterogeneous mixture?

Accepted Answer

Sand and iron filings

Question 19

Which of the following is a chemical property?

Accepted Answer

Reactivity with acid

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