Question 1

Which of the following best describes a chemical property?

Accepted Answer

The ability of a substance to react with oxygen

Question 2

A sample increases the volume of water in a graduated cylinder from 15.0 mL to 21.6 mL and has a mass of 22.35 g. What is the density of the sample?

Accepted Answer

$$d = \frac{22.35\ \mathrm{g}}{6.6\ \mathrm{mL}} = 3.4\ \mathrm{g/mL}$$

Question 3

Which subatomic particle determines the identity of an element?

Accepted Answer

Proton

Question 4

What is the atomic number (Z) of the isotope $$^{22}_{10}\mathrm{Ne}$$?

Accepted Answer

10

Question 5

Which of the following is a correct representation of an isotope of neon with 11 neutrons?

Accepted Answer

$$^{21}_{10}\mathrm{Ne}$$

Question 6

Calculate the atomic mass of neon using the following data: $$^{20}\mathrm{Ne} (90.48$$%, 19.9924 amu), $$^{21}\mathrm{Ne} (0.27$$%, 20.9938 amu), $$^{22}\mathrm{Ne} (9.25$$%, 21.9914 amu).

Accepted Answer

$$20.18\ \mathrm{amu}$$

Question 7

How many moles of copper are in 65.0 g of copper? (Molar mass of Cu = 63.55 g/mol)

Accepted Answer

$$1.02\ \mathrm{mol}$$

Question 8

Which of the following best describes an ionic bond?

Accepted Answer

A bond formed by the transfer of electrons from a metal to a nonmetal

Question 9

Which of the following elements is a molecular element in its natural form?

Accepted Answer

Oxygen ($$\mathrm{O}_2)$$

Question 10

What is the correct formula for calcium phosphate?

Accepted Answer

$$\mathrm{Ca}_3(\mathrm{PO}_4)_2$$

Question 11

Calculate the mass percent of carbon in acetylene ($$\mathrm{C}_2\mathrm{H}_2). ($$Atomic masses: C = 12.01, H = 1.008)

Accepted Answer

$$92.26\%$$

Question 12

A 13.42 g sample containing C, H, and O produces 39.6 g of $$\mathrm{CO}_2$$ and 9.01 g of $$\mathrm{H}_2\mathrm{O}$$ upon combustion. If the molar mass of the compound is 268 g/mol, what is the molecular formula?

Accepted Answer

$$\mathrm{C}_{18}\mathrm{H}_{20}\mathrm{O}_2$$

Question 13

Which of the following ions is most likely to form from a Group 1 element?

Accepted Answer

$$\mathrm{M}^+$$

Question 14

Which of the following compounds is a molecular compound?

Accepted Answer

$$\mathrm{SO}_2$$

Question 15

What is the empirical formula for a compound with 40.0% C, 6.7% H, and 53.3% O by mass?

Accepted Answer

$$\mathrm{CH}_2\mathrm{O}$$

Question 16

Which of the following best describes a metallic bond?

Accepted Answer

A bond formed by the attraction between metal cations and delocalized electrons

Question 17

How many molecules are in 15.6 g of copper(II) nitrate ($$\mathrm{Cu(NO}_3)_2$$)? (Molar mass = 187.56 g/mol, Avogadro's number = $$6.022 	imes 10$$^{23}$$)

Accepted Answer

$$5.00 	imes 10$$^{22}$$

Question 18

Which of the following is the correct name for $$\mathrm{FeCl}_3$$?

Accepted Answer

Iron(III) chloride

Question 19

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes of an element have the same number of protons but different numbers of neutrons

General Chemistry Study Notes: Matter, Atoms, Elements, and Compounds

Guida di studio - Domande di pratica

Study guide - Flashcard