Question 1

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

Accepted Answer

They have different geometric arrangements of their atoms.

Question 2

A student observes that when sugar dissolves in water, the chemical formula of sugar remains unchanged. What type of change is this, and why?

Accepted Answer

It is a physical change because the chemical composition of sugar is unaltered.

Question 3

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

Accepted Answer

Tea with sugar

Question 4

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

Accepted Answer

Filtration

Question 5

A sample of copper is heated from room temperature to $$95^\circC. $$What happens to its density?

Accepted Answer

The density decreases because the sample expands.

Question 6

Which of the following is an intensive property?

Accepted Answer

Density

Question 7

Convert $$25.0^\circC to $$Kelvin.

Accepted Answer

$$298.2 K$$

Question 8

A block has dimensions $$4.0 cm$$ $$	imes$$ $$3.0 cm$$ $$	imes$$ $$2.0 cm $$and a mass of $$96 g. $$What is its density in $$\mathrm{g/cm^3$}$$?

Accepted Answer

$$4.0$$ $$\mathrm{g/cm^3$}$$

Question 9

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 10

Which of the following is a chemical property?

Accepted Answer

Flammability

Question 11

A thermometer reads $$37.0^\circC. $$What is this temperature in $$^\circF$$?

Accepted Answer

$$98.6^\circF$$

Question 12

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

Accepted Answer

Water boiling

Question 13

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?

Accepted Answer

Low accuracy, high precision

Question 14

Which of the following is the correct SI unit for the amount of substance?

Accepted Answer

Mole (mol)

Question 15

Which of the following best describes why mixtures can be separated by physical means?

Accepted Answer

Their components have different physical or chemical properties.

Question 16

A sample contains only one type of atom. Which classification best fits this sample?

Accepted Answer

Element

Question 17

Which of the following is the correct formula for converting Celsius to Kelvin?

Accepted Answer

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

Question 18

Which of the following is an example of a derived unit?

Accepted Answer

Liter (L)

Question 19

A plane is carrying $$173,231 L of $$fuel with a density of $$0.768 g/cm$^3. $$What is the mass of the fuel in kilograms? ($$1 L$$ $$= 1000 cm$^3)$$

Accepted Answer

$$133,100 kg$$

Question 20

Which of the following best describes the law of conservation of energy?

Accepted Answer

Energy can be transformed but is never created or destroyed.

Chapter 1 Student Notes

Guida di studio - Domande di pratica