Physical Properties of Matter Review 5.6A 5.6B 5.6C

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 from lowest to highest density is D) Object X, Water, Object Y, Liquid 2. This indicates that Object X is less dense than Water, which is less dense than Object Y, and Liquid 2 has the highest density.

Front

Students poured water and cooking oil into a beaker. The students then added a penny, a plastic paper clip, and a cork to the beaker and recorded their observations.
Observations:

• The water was on the bottom, and the oil was on top of the water.


• The penny dropped to the bottom of the beaker.


• The plastic paper clip floated on the water but under the oil.


• The cork floated on top of the oil.

Which list puts the items in order from most dense to least dense?

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 it. 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? Options: Eraser, toothpick, cotton ball; Toothpick, paper clip, safety pin; Eraser, paper clip, safety pin; Paper clip, safety pin, aluminum foil.

Back

Eraser, toothpick, cotton ball

Answer explanation

Electrical insulators do not conduct electricity. An eraser, toothpick, and cotton ball are made of materials that resist electrical flow, making option A the correct choice. The other options include conductive materials.

Front

Which set of items is less dense than water?

Back

Toothpick, cork, and vegetable oil.

Answer explanation

The correct choice is J. The toothpick, cork, and vegetable oil are all less dense than water, allowing them to float, while the other options include denser materials like the penny and metal spoon.

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 properties of cooking oil and water?

Back

Cooking oil is less dense than water.

Answer explanation

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

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. This indicates that the objects can transfer heat and electricity but do not dissolve in water, distinguishing them from the other options.

Front

A student makes a mixture of gravel, iron filings, and water. Which table correctly identifies the tools that can be used to separate each substance from the mixture?

Back

Tool: Screen, Substance Separated from Mixture: Gravel; Tool: Magnet, Substance Separated from Mixture: Iron filings; Tool: Paper filter, Substance Separated from Mixture: Water

Answer explanation

The correct choice identifies the right tools: a screen separates gravel, a magnet extracts iron filings, and a paper filter is used to separate water from the mixture.

Front

Which mixture is paired with the best tool for separating the materials? Options: Mixture: Salt and pepper, Tool: Tweezers; Mixture: Pieces of cork and pebbles, Tool: Beaker of water; Mixture: Safety pins and iron nails, Tool: Magnet; Mixture: Sand and iron filings, Tool: Colander

Back

Mixture: Pieces of cork and pebbles, Tool: Beaker of water

Answer explanation

The best tool for separating pieces of cork and pebbles is a beaker of water, as cork will float while pebbles will sink, allowing for easy separation. Other pairings do not effectively separate the mixtures.

Front

The students are trying to determine the presence of which substance in the cereal?

Back

Iron

Answer explanation

The students are determining the presence of iron in the cereal, as many cereals are fortified with iron to help prevent deficiencies. Sugar, salt, and wheat are common ingredients but not specifically tested for in this context.