Unit 8 Chemical Formulas and Compounds Test

Identify any incorrect names.

• Calcium (II) oxide
• Aluminum oxide
• Ammonium peroxide
• Monosulfur dioxide
• Tetraiodide nonoxide

Identify formulas that are written incorrectly.

• Na2(C2O4)
• Mg(NH4)2
• SnCr2O7
• CaCO3
• AlCl3

What makes a compound an acid?

• When the compound is dissolved in water, it produces hydrogen ions.
• When the compound is dissolved in water, it produces hydroxide ions.
• It is soluble in water.
• When the compound is dissolved in water, it produces an equal number of hydrogen and hydroxide ions.

What makes a compound a base?

• When the compound is dissolved in water, it produces hydrogen ions.
• When the compound is dissolved in water, it produces hydroxide ions.
• It is soluble in water.
• When the compound is dissolved in water, it produces an equal number of hydrogen and hydroxide ions.

Two compounds that contain copper and chlorine have the following masses: Compound A: 32.10 g of Cu and 17.90 g of Cl Compound B: 23.64 g of Cu and 26.37 g of Cl. Are the compounds the same (meaning both would have the same chemical formula)? If not, what is the lowest whole-number mass ratio of copper that combines with a given mass of chlorine?

• Yes, they are the same compounds.
• No, they are not; it is a rough 2:1 ratio.
• No, they are not; it is a rough 1:2 ratio.
• No, they are not; it is a rough 8:5 ratio.

Nitrous oxide, known as laughing gas, is used as an anesthetic in dentistry. The mass ratio of nitrogen to oxygen is 7:4 for nitrous oxide. A 68-gram sample of a compound composed of nitrogen and oxygen contains 42 g of nitrogen. Is the sample nitrous oxide?

• No, the sample's ratio of nitrogen to oxygen is 21:13.
• No, the sample's ratio of nitrogen to oxygen is 13:26.
• Yes, the sample's ratio of nitrogen to oxygen is 7:4.
• Yes, the sample's ratio of nitrogen to oxygen is 4:7.

BaO

NCl3

HClO3

SO2