Question 1

Which of the following best explains why diamond and graphite, both made of carbon, have such different physical properties?

Accepted Answer

Diamond and graphite have different types of chemical bonds between carbon atoms.

Question 2

A student observes that ice melts into liquid water at room temperature. Which type of change is this, and why?

Accepted Answer

It is a physical change because the state changes but the molecular composition remains H$$_2O.$$

Question 3

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

Accepted Answer

Decanting

Question 4

A sample of a substance is observed to have a fixed volume and a rigid shape. Which state of matter does this describe?

Accepted Answer

Solid

Question 5

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

Accepted Answer

Sweetened tea

Question 6

Which of the following is a chemical property?

Accepted Answer

Flammability

Question 7

A block measures 5 cm x 6 cm x 8 cm. What is its volume in dm$$^3$$?

Accepted Answer

$$0.24 dm$^3$$

Question 8

Which of the following statements about energy is correct according to the law of conservation of energy?

Accepted Answer

Energy is neither created nor destroyed in a physical or chemical change.

Question 9

Convert $$0.635 L to mL.$$

Accepted Answer

$$635 mL$$

Question 10

Which of the following is an intensive property?

Accepted Answer

Density

Question 11

A student measures the mass of a lead block four times and gets values close to each other but far from the true value. What does this indicate about the measurements?

Accepted Answer

They are precise but not accurate.

Question 12

Which of the following best describes the arrangement of particles in a crystalline solid?

Accepted Answer

Particles are arranged in a regular, repeating three-dimensional pattern.

Question 13

A sample of ethanol has a density of $$0.789 g/cm$^3. $$What is the mass of $$50.0 mL of $$ethanol?

Accepted Answer

$$39.45 g$$

Question 14

Which of the following is the correct formula to convert Celsius temperature to Kelvin?

Accepted Answer

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

Question 15

A mixture of two liquids is separated by heating and collecting the vapor of the more volatile component. Which separation technique is being used?

Accepted Answer

Distillation

Question 16

How many significant figures are in the measurement $$0.0061400 s$$?

Accepted Answer

6

Question 17

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

Accepted Answer

Boiling point

Question 18

A student needs to convert $$18.0 in$^3 to cm$^3. $$Given $$2.54 cm$$ = $$1 in$$, what is the correct conversion factor to use?

Accepted Answer

$$(2.54)^3 cm$^3 / 1$ in^3$

Question 19

Which of the following best describes the process of chromatography?

Accepted Answer

Separation based on differences in solubility and intermolecular forces

Question 20

Which of the following is a correct statement about the scientific method?

Accepted Answer

A law describes what nature does, while a theory explains why nature behaves a certain way.

Matter, Measurement, and Problem Solving: General Chemistry Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard