CHM 1025C: Chapter 3 & 4 Review

The name of the oxoanion of sulfur with a 2− charge shown in the figure is

sulfite ion

The compound SO₂ is a colorless gas with a boiling of -10°C. Name this molecular compound.

sulfur dioxide

If you have 10.0 g of sodium chloride, NaCl, how many formula units are in the sodium chloride sample?

1.03 × 10²³

3.00 moles of NaOH (sodium hydroxide) are needed to prepare a solution. What mass of sodium hydroxide is required?

1.20 × 10² g

How many formula units are in 0.25 mole of Na₂O?

1.5 × 10²³

A chemical reaction produces 7.25 moles of barium sulfate, BaSO₄. What mass of barium sulfate is produced?

1.69 × 10³ g

What is the mass of 2.4 × 10²³ molecules of NO₂?

18 g

Calculate the moles and the mass of solute in 750.0 mL of 3.00 M NaCl.

2.25 moles and 131 g

The formula for novocain, a local anesthetic, is C₁₃H₂₁N₂O₂. What is the molar mass of this compound?

237.32 g/mol

How many carbon atoms are there in 0.50 mole of CO₂?

3.0 × 10²³

How much water had to be added to 50.0 mL of the first solution to obtain the second solution?

33.3 mL

How many hydrogen atoms are there in 2.0 moles of CH₄?

4.8 × 10²⁴

How much water had to be added to 10.0 mL of the first solution to obtain the second solution?

40.0 mL

How many molecules of CO₂ are present in 0.100 mol of CO₂?

6.02 × 10²² molecules

A 6.25 g sample of magnetite (Fe₃O₄) contains 4.52 g of Fe. What are the percentages of iron and oxygen in magnetite?

72.3% Fe and 27.7% O

How many hydrogen atoms are in 135 g of H₂O?

9.02 × 10²⁴ atoms

Aluminum sulfate, calcium oxide, and water react together in a process used to remove solids from treated water. Which set of formulas correspond to these compounds?

Al₂(SO₄)₃, CaO, H₂O

The formula for the bromate ion is BrO₃⁻. What is the formula for the bromite ion?

Bro₂⁻

Which of the following would you expect to be nonelectrolytes when dissolved in water? MgCl₂, CH₃OH, N₂

CH₃OH and N₂

Which of the following is classified as an ionic compound?

CaCO₃

What is the formula for a compound composed of Ca²⁺ ions and PO₄³⁻ ions?

Ca₃(PO₄)₂

The formula for the chlorite ion is:

ClO₂⁻

Which of the following formulas for a compound containing the Cr²⁺ ion is incorrect?

CrClO₄

The images in the figure represent aqueous solutions of ionic compounds. Which could correspond to Na₂S?

I only (yellow with "2-" & grey)

Which set of formulas is correct for the compounds ammonia, nitric acid, and nitrous acid, respectively?

NH₃, HNO₃, HNO₂

The correct formula for dinitrogen pentoxide is:

N₂O₅

The correct formulas for the compounds in the figure are:

PCl₃, SCl₆, C₃H₆F₂

The following minerals contain lead. Rank the minerals in order of percent lead from least to greatest: cottunite, PbCl₂; anglesite, PbSO₄; andorite, PbAgSb₃S₆; and galena, PbS.

PbAgSb₃S₆ < PbSO₄ < PbCl₂ < PbS

Which of the following is classified as a molecular compound?

SO₂

Which of the following compound names is not correct?

copper(II) diphosphide