A fossil cast

The video tutorial guides viewers through an experiment to create a plaster of paris mold. It begins with gathering necessary materials, then proceeds to prepare the mold by oiling a metal mold and mixing plaster of paris with water. The mixture is poured into the mold and left to solidify for at least a day. Finally, the metal mold is removed, revealing that the plaster has formed a detailed replica of the metal mold, demonstrating the process of mold making.

Which of the following is NOT a material needed for the experiment?

• Plastic container

• Plaster of paris

• Glass jar

• Metal mold

What is the first step in preparing the metal mold?

• Setting the mold aside to solidify

• Pouring the mixture into the mold

• Painting the internal surface with oil

• Mixing plaster of paris with water

How do you mix the plaster of paris with water?

• Using a wooden rod

• Using a brush

• Using a metal rod

• Using a plastic spoon

How long should the plaster of paris be left to solidify?

• A few hours

• At least one day

• Two days

• One week

What conclusion can be drawn from the experiment?

• The details of the mold are not preserved

• The metal mold is not necessary

• The plaster of paris does not solidify properly

• The solidified plaster forms a mold of the metal mold