Chemical Reactions and Mass Changes

The video demonstrates that oxygen in the air has mass by reacting it with iron. Steel wool, made of iron, is used to react with oxygen, forming iron oxide. The mass of the steel wool increases as the reaction proceeds, indicating the mass of oxygen that has combined with the iron. The initial mass of the steel wool is 0.688, and the final mass is 0.765, showing the mass of oxygen added. This experiment confirms that oxygen in the air has mass.

What is the purpose of reacting iron with oxygen in this experiment?

• To measure the density of iron

• To create a new type of metal

• To produce heat energy

• To determine if oxygen has mass

What material is used to react with oxygen in the air?

• Aluminum foil

• Steel wool

• Copper wire

• Plastic sheet

What is formed when oxygen reacts with iron in this experiment?

• Iron sulfate

• Iron oxide

• Iron chloride

• Iron nitrate

How does the mass change as the reaction proceeds?

• The mass decreases

• The mass fluctuates

• The mass remains the same

• The mass increases

What does the difference in initial and final mass represent?

• The amount of energy consumed

• The amount of iron used

• The amount of oxygen reacted

• The amount of heat produced