Question 1

Which of the following ions will always form soluble compounds in water, according to the solubility rules?

Accepted Answer

$$\mathrm{NO_3$^-}$$

Question 2

A sample contains $$1.48 	imes 10$$^{25}$$ atoms of Cs. How many moles of Cs are present?

Accepted Answer

$$2.46$$ mol

Question 3

Which of the following compounds is insoluble in water?

Accepted Answer

$$\mathrm{AgCl}$$

Question 4

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

Accepted Answer

$$\mathrm{CH_2O}$$

Question 5

Which of the following is a strong acid?

Accepted Answer

$$\mathrm{$$HNO_3$$}$$

Question 6

Balance the following equation: $$\mathrm{Na_3PO_4 + Ba(NO_3$)_2 \rightarrow Ba_3$(PO_4$)_2 + $$NaNO_3$$}$$

Accepted Answer

$$2, 3, 1, 6$$

Question 7

Which of the following is the correct molar mass of $$\mathrm{Al_2$(SO_4$)_3}$$?

Accepted Answer

$$342.15 g/$$mol

Question 8

A student mixes solutions of $$\mathrm{Na_2CO_3}$$ and $$\mathrm{$$CuCl_2$$}. $$What is the precipitate formed?

Accepted Answer

$$\mathrm{$$CuCO_3$$}$$

Question 9

Which of the following is the correct IUPAC name for $$\mathrm{V_2O_5}$$?

Accepted Answer

Vanadium(V) oxide

Question 10

Which of the following pairs will NOT form a precipitate when mixed in aqueous solution?

Accepted Answer

$$\mathrm{$$NaNO_3$$}$$ + $$\mathrm{KCl}$$

Question 11

How many atoms are in $$1.00$$ mole of any element?

Accepted Answer

$$6.022 	imes 10$$^{23}$$

Question 12

Which of the following is the correct formula for magnesium oxalate?

Accepted Answer

$$\mathrm{MgC_2O_4}$$

Question 13

A compound contains $$58.8\%$$ barium, $$13.7\%$$ sulfur, and $$27.5\%$$ oxygen by mass. What is its empirical formula?

Accepted Answer

$$\mathrm{$$BaSO_4$$}$$

Question 14

Which of the following is a correct net ionic equation for the reaction between $$\mathrm{Na_2SO_4}$$ and $$\mathrm{$$BaCl_2$$}$$?

Accepted Answer

$$\mathrm{Ba$$^{2+}$$ (aq) + SO_4$^{2-} (aq) \rightarrow $$BaSO_4$$ (s)}$$

Question 15

Which of the following is the correct molecular formula for a compound with empirical formula $$\mathrm{CH_2O}$$ and a molar mass of $$180 g/$$mol?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$}$$

Intro to Chemistry Exam 2 Study Guidance

스터디 가이드 - 연습 문제