The video features three science performance tasks for grade 4 students. The first task involves testing various items to see if they float or sink in water. The second task demonstrates the melting and freezing of ice, showing how solid materials change when heated. The third task explores mixtures, distinguishing between homogeneous and heterogeneous types. Each task is presented with a simple experiment and a brief explanation of the observed phenomena.

What is the main focus of the first science performance task?

• Mixing different powders

• Exploring the interaction of materials with water

• Observing the melting of ice cubes

• Freezing water

Which of the following materials was NOT mentioned in the first task?

• Plastic bottle

• Stone

• Metal spoon

• Glass jar

What happens to ice cubes when they are placed on fire?

• They freeze

• They melt

• They evaporate

• They remain unchanged

What is the result of placing water in the freezer for six hours?

• It condenses

• It freezes

• It evaporates

• It boils

What is the key learning from the second science performance task?

• Materials can float or sink

• Ice cubes change state when heated

• Different powders can be mixed

• Water can be frozen

What materials are used in the third science performance task?

• Ice cubes and tongs

• Candle and tin can

• Plastic bottle and metal spoon

• Pepper, salt, baby powder, and flour

What type of mixture is formed when pepper and salt are mixed?

• Colloid

• Solution

• Heterogeneous mixture

• Homogeneous mixture

Which mixture allows you to identify its individual components easily?

• Colloid

• Solution

• Heterogeneous mixture

• Homogeneous mixture

What is the main observation when baby powder and flour are mixed?

• They dissolve in water

• They do not mix at all

• They form a homogeneous mixture

• They form a heterogeneous mixture

Which of the following is NOT a characteristic of a homogeneous mixture?

• Uniform composition

• Cannot see individual components

• Components are easily distinguishable

• Looks the same throughout