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

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

Q: A student converts $$2\ \mu\mathrm{m} to $$meters. What is the correct value?

$$2 \times 10$$^{-6}$$\ \mathrm{m}$$

Question 1

Which of the following best describes why NaBr is classified as an ionic compound, while CCl4 is not?

Accepted Answer

NaBr is composed of a metal and a nonmetal, resulting in electron transfer and ionic bonding, while CCl4 consists of only nonmetals sharing electrons.

Question 2

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

Accepted Answer

Cesium, because it has the largest molar mass, resulting in fewer moles and thus fewer atoms for the same mass.

Question 3

Which of the following is a correct application of significant figures when multiplying 9.040 by 0.0400?

Accepted Answer

The answer should have three significant figures, because both numbers have three 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 new substances such as carbon dioxide and water.

Question 6

How many moles are in $$2.16 	imes 10$$^{24}$$ atoms of silver ($$\mathrm{Ag}$$)? Use 6.022$$ 	imes $$10^{23} as $$Avogadro's number.

Accepted Answer

$$3.59$$ moles

Question 7

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

Accepted Answer

$$\mathrm{F^-}$$, $$\mathrm{Ne}$$, $$\mathrm{Mg$$^{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 chemical reaction is performed: $$\mathrm{CH_4$} + 2\mathrm{O_2$} \rightarrow \mathrm{CO_2$} + 2\mathrm{H_2O}. If$$ $$0.80\ \mathrm{g} of $$methane reacts with $$3.2\ \mathrm{g} of $$oxygen to produce $$2.2\ \mathrm{g} of $$carbon dioxide, what mass of water is formed?

Accepted Answer

$$1.8\ \mathrm{g}$$

Question 11

Which of the following is the correct chemical formula for barium nitrite?

Accepted Answer

$$\mathrm{Ba(NO_2$)_2}$$

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

Which of the following is NOT an empirical formula?

Accepted Answer

$$\mathrm{C_2H_4O_2}$$

Question 14

A student converts $$2\ \mu\mathrm{m} to $$meters. What is the correct value?

Accepted Answer

$$2 	imes 10$$^{-6}$$\ \mathrm{m}$$

Question 15

Which of the following best describes an anion?

Accepted Answer

An atom that has gained an electron.

Question 16

What is the correct name for aqueous $$\mathrm{HF}$$?

Accepted Answer

hydrofluoric acid

Question 17

Which of the following is a homogeneous mixture?

Accepted Answer

cola

Question 18

How many significant figures are in the measurement $$463.090\ \mathrm{m}$$?

Accepted Answer

6

Question 19

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

Accepted Answer

$$\mathrm{Ca_3N_2}$$

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

Guida di studio - Domande di pratica

Study guide - Flashcard