Front

Which material will keep a hot drink warm for the longest period of time? Material 1: 92, 84, 75, 67; Material 2: 95, 85, 70, 65; Material 3: 96, 92, 88, 84; Material 4: 98, 95, 90, 85.

Back

Material 4

Answer explanation

Material 4 maintains the highest temperature over the 4 minutes, starting at 98°C and ending at 85°C. This shows it keeps the drink warm the longest compared to the other materials.

Front

Which statement BEST supports the answer to Part A? Options: The material that will keep the drink warm longest insulates thermal energy inside the cup., The material that will keep the drink warm longest conducts thermal energy into the cup., The material that will keep the drink warm longest conducts thermal energy away from the cup., The material that will keep the drink warm longest insulates thermal energy from entering the cup.

Back

The material that will keep the drink warm longest insulates thermal energy inside the cup.

Answer explanation

The correct choice states that the material insulates thermal energy inside the cup, which is essential for keeping the drink warm. Insulation prevents heat loss, thus maintaining the drink's temperature longer.

Front

Order the materials from lowest to highest density: Water, Liquid 2, Object X, Object Y.

Back

Object X, Water, Object Y, Liquid 2

Answer explanation

The correct order of materials from lowest to highest density is Object X, Water, Object Y, Liquid 2. This indicates that Object X is the least dense, followed by Water, then Object Y, and finally Liquid 2 as the most dense.

Front

Order the items from most dense to least dense: penny, water, plastic paper clip, oil, cork.

Back

Penny, water, plastic paper clip, oil, cork

Answer explanation

The penny is the most dense as it sinks, followed by water, which is denser than the plastic paper clip that floats on water. Oil is less dense than water, and the cork is the least dense, floating on top of the oil. Thus, the order is penny, water, plastic paper clip, oil, cork.

Front

Which objects are electrical insulators?

Back

Eraser, toothpick, cotton ball

Answer explanation

The correct choice is A) Eraser, toothpick, cotton ball, as these materials do not allow electric current to pass through, making them electrical insulators. The other options include conductive materials that complete the circuit.

Front

Which set of items is less dense than water? Options: Plastic paper clip, penny, and cork; Toothpick, metal spoon, and plastic paper clip; Metal spoon, vegetable oil, and penny; Toothpick, cork, and vegetable oil.

Back

Toothpick, cork, and vegetable oil

Answer explanation

The toothpick, cork, and vegetable oil are all less dense than water, allowing them to float. In contrast, the penny and metal spoon are denser than water, causing them to sink.

Front

What question provides the best evidence that an object is a metal?

Back

Does it conduct thermal energy?

Answer explanation

The best evidence that an object is a metal is its ability to conduct thermal energy. Metals are known for their excellent thermal conductivity, unlike non-metals, which typically do not conduct heat well.

Front

A student poured equal amounts of water and cooking oil into a jar, shook it, and let it sit. What does this investigation show about the density of cooking oil compared to water?

Back

Cooking oil is less dense than water.

Answer explanation

The investigation shows that after shaking, the water and cooking oil separate, indicating that cooking oil is less dense than water, as it floats on top.

Front

Classify objects based on common physical properties: Insulate thermal energy, Bendable, Attract to magnets; Soluble in water, Attract to magnets, Conduct thermal energy; Conduct electrical energy, Bendable, Soluble in water; Conduct thermal energy, Conduct electrical energy, Not soluble in water.

Back

Conduct thermal energy, Conduct electrical energy, Not soluble in water.

Answer explanation

The correct classification is J) Conduct thermal energy, Conduct electrical energy, Not soluble in water. These properties indicate that the objects are likely metals, which conduct heat and electricity but do not dissolve in water.

Front

Conclusion about the samples based on the table.

Back

Sample 2 is made of metal.

Answer explanation

Sample 2 is identified as metal because it is the only option that aligns with the properties typically associated with metals, such as conductivity and density, which are not indicated for the other samples.