Mass of Wire Wool

The video tutorial demonstrates an experiment to observe the effects of combustion on wire wool. It begins by introducing the materials needed: wire wool, a blowtorch, a digital balance, a metal bucket, and a compressed air pump. The experiment involves burning the wire wool and measuring the mass before and after combustion, showing an increase in mass due to the formation of iron oxide. The tutorial explains the combustion process, highlighting the role of heat, oxygen, and fuel. It compares the burning of wire wool to solid iron, emphasizing the larger surface area of wire wool that facilitates combustion. The video concludes by explaining the chemical reaction where oxygen combines with iron, resulting in a mass increase.

What is the primary purpose of the experiment involving wire wool?

• To calculate the speed of combustion in different metals

• To measure the temperature change during combustion

• To observe the change in mass of wire wool as it burns

• To determine the color change in wire wool when heated

Which tool is used to intensify the burning of wire wool in the experiment?

• A digital balance

• A large metal bucket

• A compressed air pump

• A thermometer

What is the observed change in mass of the wire wool after combustion?

• It decreases by 3 1/2 grams

• It decreases by 5 grams

• It remains the same

• It increases by 3 1/2 grams

Why does wire wool burn more readily than solid iron?

• It has a larger surface area

• It has a higher iron content

• It is more reactive with water

• It is lighter in weight

What compound is formed when metallic iron burns?

• Iron 2 oxide

• Iron 3 oxide

• Carbon dioxide

• Water vapor

What role does oxygen play in the combustion of wire wool?

• It prevents the reaction from occurring

• It acts as a fuel

• It combines with iron to form a new compound

• It cools down the reaction

Why is the residue from burning wood lighter than the original material?

• Gases are released during combustion

• The wood expands in volume

• The wood absorbs moisture

• The wood becomes denser