Physical Properties of Matter Review 5.6A 5.6B 5.6C

A student conducted an investigation about density. The materials used were Water, Liquid 2, Object X, and Object Y. The results of the investigation are shown. Which option shows the correct order of the materials from lowest to highest density?

• A) Object X, Object Y, Water, Liquid 2

• B) Water, Liquid 2, Object X, Object Y

• C) Water, Object X, Liquid 2, Object Y

• D) 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.

Tags

NGSS.MS-PS1-2

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?

• Cork, oil, plastic paper clip, water, penny

• Water, penny, oil, plastic paper clip, cork

• Penny, water, plastic paper clip, oil, cork

• Oil, penny, cork, plastic paper clip, water

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.

Tags

NGSS.MS-PS1-2

Which objects are electrical insulators?

• A) Eraser, toothpick, cotton ball

• B) Toothpick, paper clip, safety pin

• C) Eraser, paper clip, safety pin

• D) Paper clip, safety pin, aluminum foil

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.

Tags

NGSS.MS-PS2-3

A student places objects in a bucket of water to determine if they will float. Which set of items is less dense than water?

• F. Plastic paper clip, penny, and cork

• G. Toothpick, metal spoon, and plastic paper clip

• H. Metal spoon, vegetable oil, and penny

• J. 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.

A student is classifying objects. Answering which question will provide the best evidence that an object is a metal?

• What is its mass?

• What is its physical state?

• Does it conduct thermal energy?

• How quickly does it dissolve in water?

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.

Tags

NGSS.MS-PS3-3

A student poured equal amounts of water and cooking oil into a jar. The student placed a lid on the jar and shook the mixture for five seconds and then let the jar sit for ten minutes. The results of this investigation are shown. Which conclusion best compares a property of cooking oil and water shown in this investigation?

• Cooking oil is less dense than water.

• Water is less dense than cooking oil.

• Water dissolves in cooking oil.

• Cooking oil dissolves in 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.

Tags

NGSS.MS-PS1-2

Students observe some objects on a lab tray. The students will classify the objects based on physical properties common to all of the objects. Based on their common properties, how should these objects be classified?

• F) Insulate thermal energy, Bendable, Attract to magnets

• G) Soluble in water, Attract to magnets, Conduct thermal energy

• H) Conduct electrical energy, Bendable, Soluble in water

• J) 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.

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?

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

• Tool: Funnel, Substance Separated from Mixture: Gravel; Tool: Paper filter, Substance Separated from Mixture: Iron filings; Tool: Hot plate, Substance Separated from Mixture: Water

• Tool: Screen, Substance Separated from Mixture: Gravel; Tool: Hot Plate, Substance Separated from Mixture: Iron filings; Tool: Funnel, Substance Separated from Mixture: Water

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

The pictures show tools that can be used for separating mixtures. Which mixture is paired with the best tool for separating the materials?

• 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

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.

Tags

NGSS.3-PS2-4

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

• Sugar

• Iron

• Salt

• Wheat

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.

Tags

NGSS.MS-PS1-2