Q: A cube has edges of 2.00 cm and a mass of 12.0 g. What is its density?

$$d = \frac{12.0\,g}{2.00\,cm \times 2.00\,cm \times 2.00\,cm} = 1.50\,g/cm^3$

Q: Convert $$0.00348\,m^3$ to cm^3$.

$$0.00348\,m^3$ \times 1,000,000\,cm^3$/m^3 = 3$$,480\,$$cm^3$

Q: Express $$10^{\circ}C$ in Kelvin and Fahrenheit.

$$K = 10 + 273.15 = 283.15\,K$$; $$^{\circ}F = (9/5) \times 10 + 32 = 50$$^{\circ}$$F$$

Q: A cube of a substance with $$3.00\,cm$$ edges has the same density as a $$2.00\,cm$$ cube that weighs $$12.0\,g. $$What is the mass of the $$3.00\,cm$$ cube?

$$m = d \times V = 1.50\,g/cm^3$ \times 27.0\,cm^3$ = 40.5\,g$$

Question 1

Which of the following statements best describes an intensive property?

Accepted Answer

A property that is independent of the amount of substance present.

Question 2

A cube has edges of 2.00 cm and a mass of 12.0 g. What is its density?

Accepted Answer

$$d = \frac{12.0\,g}{2.00\,cm 	imes 2.00\,cm 	imes 2.00\,cm} = 1.50\,g/cm^3$

Question 3

Which of the following is a chemical change?

Accepted Answer

Burning gasoline.

Question 4

What is the correct name for the compound $$CuSO_4$$?

Accepted Answer

Copper(II) sulfate

Question 5

Which of the following is a strong electrolyte?

Accepted Answer

$$NaCl$$

Question 6

A solution is prepared by dissolving $$5.00\,g of$$ $$NaCl in$$ $$100.0\,g of $$water. Which is the solute?

Accepted Answer

$$NaCl$$

Question 7

What is the oxidation state of sulfur in $$SO_4$$^{2-}$$?

Accepted Answer

$$+6$$

Question 8

Which of the following reactions is a redox reaction?

Accepted Answer

$$2Mg(s) + O_2$(g) \rightarrow 2MgO(s)$$

Question 9

Convert $$0.00348\,m^3$ to cm^3$.

Accepted Answer

$$0.00348\,m^3$ 	imes 1,000,000\,cm^3$/m^3 = 3$$,480\,$$cm^3$

Question 10

What is the empirical formula of a compound that is 80.0% carbon and 20.0% hydrogen by mass?

Accepted Answer

$$CH_3$$

Question 11

Which of the following is a homogeneous mixture?

Accepted Answer

Air

Question 12

What is the correct formula for nitric acid?

Accepted Answer

$$HNO_3$$

Question 13

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

Accepted Answer

Boiling point

Question 14

Express $$10^{\circ}C$ in Kelvin and Fahrenheit.

Accepted Answer

$$K = 10 + 273.15 = 283.15\,K$$; $$^{\circ}F = (9/5) 	imes 10 + 32 = 50$$^{\circ}$$F$$

Question 15

Which of the following compounds is insoluble in water?

Accepted Answer

$$AgCl$$

Question 16

What is the correct name for $$N_2O_5$$?

Accepted Answer

Dinitrogen pentoxide

Question 17

Which of the following is a weak electrolyte?

Accepted Answer

$$CH_3COOH$$

Question 18

Which of the following statements about oxidation and reduction is correct?

Accepted Answer

Oxidation is the loss of electrons; reduction is the gain of electrons.

Question 19

A cube of a substance with $$3.00\,cm$$ edges has the same density as a $$2.00\,cm$$ cube that weighs $$12.0\,g. $$What is the mass of the $$3.00\,cm$$ cube?

Accepted Answer

$$m = d 	imes V = 1.50\,g/cm^3$ 	imes 27.0\,cm^3$ = 40.5\,g$$

General Chemistry I: Foundations, Nomenclature, Stoichiometry, and Aqueous Reactions

Guida di studio - Domande di pratica

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