Question 1

Which of the following elements is most likely to form a +2 ion based on its position in the periodic table?

Accepted Answer

Mg

Question 2

Which of the following best describes the trend in atomic radius as you move from left to right across a period in the periodic table?

Accepted Answer

Atomic radius decreases

Question 3

Which of the following compounds is a binary molecular (covalent) compound?

Accepted Answer

CO2

Question 4

Which of the following ions is a polyatomic anion?

Accepted Answer

$$SO4^{2-}$$

Question 5

Which of the following is the correct electron configuration for a neutral atom of phosphorus (P, atomic number 15)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^3$$

Question 6

Which of the following elements has the highest first ionization energy?

Accepted Answer

Ne

Question 7

Which of the following is a correct balanced equation for the decomposition of calcium carbonate?

Accepted Answer

$$CaCO_3$$\ (s) \rightarrow CaO\ (s) + $$CO_2$$\ (g)$$

Question 8

Which of the following is a double-replacement reaction?

Accepted Answer

$$AgNO_3 + $$NaCl \rightarrow AgCl + $$NaNO_3$$

Question 9

Which of the following elements occurs naturally as a diatomic molecule?

Accepted Answer

Oxygen

Question 10

A sample contains $$3.01 	imes 10$$^{23}$$ molecules of CO_2$. How many moles of CO_2$ are present?

Accepted Answer

$$0.50$$ mol

Question 11

Which of the following is the correct formula for the ionic compound formed between magnesium and nitrate?

Accepted Answer

$$Mg(NO_3$)_2$$

Question 12

Which of the following is the correct systematic name for $$H_2SO_4$$?

Accepted Answer

Sulfuric acid

Question 13

Which of the following best describes the trend in metallic character as you move down a group in the periodic table?

Accepted Answer

Metallic character increases

Question 14

Which of the following is the correct percent composition by mass of hydrogen in $$H_2O$$? (Atomic masses: H = 1.0, O = 16.0)

Accepted Answer

$$11.1\%$$

Question 15

Which of the following is the empirical formula for a compound that is $$40.0\%$$ carbon, $$6.7\%$$ hydrogen, and $$53.3\%$$ oxygen by mass?

Accepted Answer

$$CH_2O$$

Question 16

Which of the following statements about the solubility of ionic compounds in water is correct?

Accepted Answer

All nitrates are soluble in water

Question 17

Which of the following metals will react with water at room temperature to produce hydrogen gas?

Accepted Answer

Potassium

Question 18

What is the molar mass of $$Al_2$$($$SO_4)_3$? (Atomic masses: Al = 27.0, S = 32.1, O = 16.0)

Accepted Answer

$$342.2\ g/mol$$

Question 19

Which of the following is the correct balanced equation for the neutralization of hydrochloric acid with sodium hydroxide?

Accepted Answer

$$HCl + NaOH \rightarrow NaCl + H_2O$$

Question 20

A gas has a molar mass of $$44.0\ g/mol. $$What is its density at STP? (Molar volume at STP = $$22.4\ L)$$

Accepted Answer

$$1.96\ g/L$$

Study Guide: Periodic Table, Chemical Nomenclature, Reactions, and Mole Concept

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