8.3 Metals and Oxygen

What type of reaction occurs when a metal reacts with oxygen?

• Reduction

• Oxidation

• Neutralization

• Combustion

Why do sodium, potassium, and calcium appear dull when taken out of their containers?

• They absorb moisture from the air.

• They immediately react with oxygen in the air, forming a metal oxide layer.

• They evaporate quickly.

• They lose electrons spontaneously.

Which of the following metals is the most reactive with oxygen?

• Iron

• Magnesium

• Gold

• Silver

Why are some reactive metals, such as sodium and potassium, stored under oil?

• To keep them cool.

• To prevent them from rusting.

• To prevent them from reacting with oxygen and water vapor in the air.

• To make them shinier.

Which metal does NOT react with oxygen and is considered inert?

• Silver

• Magnesium

• Iron

• Gold

6. What is the general word equation for the reaction of a metal with oxygen?

• Metal + Oxygen → Metal Oxide

• Metal + Water → Metal Hydroxide

• Metal + Acid → Salt + Hydrogen

• Metal + Carbon Dioxide → Metal Carbonate

Which of the following represents the reaction of metal with oxygen?

• Metal + oxygen → metal hydroxide

• Metal + water → metal oxide

• Metal + oxygen → metal oxide

• Metal + hydrogen → metal oxide

What two conditions are necessary for iron to rust?

• A) Heat and air

• B) Water and oxygen

• C) Water and heat

• D) Light and oxygen

What is the name of the substance formed when iron reacts with oxygen in the presence of water?

• Iron carbonate

• Iron chloride

• Iron oxide

• Iron hydroxide

In a rusting experiment, which test tube would show the most rust formation?

• A test tube with only dry air.

• A test tube with water and open to the air.

• A test tube with boiled water and sealed with oil.

• A test tube with calcium chloride to absorb moisture.