Unit 4: Chemical Reactions

What is the molarity of a solution if 69.73 g of H₂SO₄ is dissolved in enough water to make a 500. mL solution?

• 1.01 M

• 1.42 M

• 0.00142 M

• 0.139 M

Which would be considered a correct concentration for ions in a 0.750 M K₂Cr₂O₇? Choose all that apply.

• 1.50 M K⁺

• 1.50 M Cr⁶⁺

• 5.25 M O^2-

• 2.25 M total ion concentration

An acid base titration is conducted. How many mL of a 0.50 M Ca(OH)₂ solution are required to titrate a 30.0 mL sample of 0.12 M HCl to the endpoint?

• 7.2 mL

• 3.6 mL

• 30. mL

• 60. mL

What mass of precipitate is produced when 100. mL of 0.500 M AlCl₃ is added to 100. mL of 0.500 M Na₂S?

• 2.51 g

• 3.76 g

• 5.02 g

• 7.52 g

A 1.750 g sample of a silver alloy was dissolved in nitric acid and then precipitated as silver bromide. After drying, the silver bromide weighed 2.000 g. What is the percentage silver in the alloy?

• 87.50%

• 65.71%

• 57.45%

• 42.63%

What is the oxidation number of 'Cl' in NaClF₄?

• -1

• +1

• +3

• +5

• 2

• 4

• 6

• 8

• SO₂

• Br₂

• Br^-

• SO₄^2-

• 3

• 6

• 9

• 12

• Zn

• NO₃^-

• Zn²⁺

• NH₃