Q: Which of the following is a correct application of significant figures when multiplying 2.34 (3 sig figs) by 0.0041 (2 sig figs)?

$$2.34 \times 0.0041 = 0.0096 ($$rounded to 2 significant figures)

Q: How many chloride ions are present in $$4.50$$ mol of aluminum chloride ($$\mathrm{$$AlCl_3$$}$$)?

$$8.13 \times 10$$^{24}$$ chloride ions

Question 1

Which of the following best describes why NaBr is classified as an ionic compound, while CO2 is not?

Accepted Answer

NaBr contains a metal and a nonmetal, resulting in electron transfer and ionic bonding, while CO2 contains only nonmetals and forms covalent bonds.

Question 2

A sample of 10.0 g of five different elements is compared. Which element will have the fewest atoms in the sample?

Accepted Answer

Cesium (Cs)

Question 3

Which of the following is a correct application of significant figures when multiplying 2.34 (3 sig figs) by 0.0041 (2 sig figs)?

Accepted Answer

$$2.34 	imes 0.0041 = 0.0096 ($$rounded to 2 significant figures)

Question 4

A 43.6 g piece of metal has a density of $$2.71\ \mathrm{g/cm^3$}. $$What is its volume in $$\mathrm{cm^3$}$$?

Accepted Answer

$$16.1\ \mathrm{cm^3$}$$

Question 5

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

Accepted Answer

A candle burns, producing heat, light, and new substances.

Question 6

How many moles are in $$2.16 	imes 10$$^{24}$$ atoms of silver?

Accepted Answer

$$3.59$$ moles

Question 7

Which of the following sets contains species with the same number of electrons?

Accepted Answer

$$\mathrm{F^-}$$, Ne, $$\mathrm{Mg$$^{2+}$$}$$

Question 8

A room measures $$11.0\ \mathrm{ft} 	imes 11.0\ \mathrm{ft}$$ with a $$10.0\ \mathrm{ft}$$ ceiling. If the density of air is $$1.19\ \mathrm{g/L}$$, what is the mass of air in the room in kilograms? ($$1\ \mathrm{in} = 2.54\ \mathrm{cm}$$, $$1\ \mathrm{L} = 10^3$\ \mathrm{cm^3$})$$

Accepted Answer

$$40.8\ \mathrm{kg}$$

Question 9

Which of the following is the correct empirical formula for a compound that is $$62.0\% C$$, $$10.4\% H$$, and $$27.5\% O by $$mass?

Accepted Answer

$$\mathrm{C_3H_6O}$$

Question 10

A student balances the following equation: $$\mathrm{C_2H_6O (l) + O_2$ (g) \rightarrow CO_2$ (g) + H_2O (l)}. $$What is the correct stoichiometric coefficient for $$\mathrm{O_2$}$$?

Accepted Answer

$$3$$

Question 11

Which of the following is the correct name for $$\mathrm{Ba(NO_2$)_2}$$?

Accepted Answer

Barium nitrite

Question 12

How many chloride ions are present in $$4.50$$ mol of aluminum chloride ($$\mathrm{$$AlCl_3$$}$$)?

Accepted Answer

$$8.13 	imes 10$$^{24}$$ chloride ions

Question 13

A sample of $$3.00\ \mathrm{g} of $$ethanol ($$\mathrm{CH_3CH_2OH}) $$contains how many moles?

Accepted Answer

$$0.0652$$ mol

Question 14

Which of the following is the correct chemical formula for calcium nitride?

Accepted Answer

$$\mathrm{Ca_3N_2}$$

Question 15

A combustion analysis of a hydrocarbon produces $$0.2845\ \mathrm{g} of$$ $$\mathrm{CO_2$}$$ and $$0.1451\ \mathrm{g} of$$ $$\mathrm{H_2O}. $$What is the empirical formula of the compound?

Accepted Answer

$$\mathrm{C_2H_5}$$

Question 16

Which of the following is NOT an empirical formula?

Accepted Answer

$$\mathrm{C_2H_4O_2}$$

Question 17

What is the correct name for an aqueous solution of $$\mathrm{H_2S}$$?

Accepted Answer

Hydrosulfuric acid

Question 18

A person weighs $$77.1\ \mathrm{kg}. $$What is his weight in pounds? ($$1\ \mathrm{kg} = 2.20462\ \mathrm{lb})$$

Accepted Answer

$$170$$ pounds

Question 19

Which of the following is the lowest temperature?

Accepted Answer

$$57^\circ \mathrm{F}$$

General Chemistry Practice Exam 1 – Step-by-Step Study Guidance

Guida di studio - Domande di pratica

Study guide - Flashcard