Exploring Mixtures and Solutions

What is the physical state of water at room temperature?

• Solid

• Liquid

• Gas

• Plasma

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DOK Level 1: Recall

TEKS.SCI.5.6A

Which of the following mixtures can be separated using a magnet?

• Salt and water

• Sand and water

• Iron filings and sand

• Sugar and water

Answer explanation

Iron filings can be attracted to a magnet, while sand cannot. Therefore, the mixture of iron filings and sand can be separated using a magnet, making it the correct choice.

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DOK Level 1: Recall

TEKS.SCI.5.6B

What happens to the mass of substances when they are combined into a solution?

• The mass increases

• The mass decreases

• The mass remains the same

• The mass becomes zero

Answer explanation

When substances are combined into a solution, the total mass of the system remains the same due to the law of conservation of mass. Therefore, the correct answer is that the mass remains the same.

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DOK Level 1: Recall

TEKS.SCI.5.6C

Which property of matter is demonstrated by air filling a balloon?

• Mass

• Volume

• Density

• Magnetism

Answer explanation

The property demonstrated by air filling a balloon is volume. Volume refers to the amount of space an object occupies, and in this case, the air expands to fill the balloon's interior.

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DOK Level 1: Recall

TEKS.SCI.5.6D

Compare the solubility of sugar in water to that of sand in water.

• Both sugar and sand dissolve in water

• Sugar dissolves in water, but sand does not

• Sand dissolves in water, but sugar does not

• Neither sugar nor sand dissolves in water

Answer explanation

Sugar dissolves in water due to its molecular structure, allowing it to interact with water molecules. In contrast, sand is composed of larger particles that do not interact with water, making it insoluble.

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DOK Level 2: Skill/Concept

TEKS.SCI.5.6A

Explain why iron filings can be separated from sand using a magnet.

• Iron filings are heavier than sand

• Iron filings are magnetic, but sand is not

• Sand is magnetic, but iron filings are not

• Both iron filings and sand are magnetic

Answer explanation

Iron filings can be separated from sand using a magnet because iron filings are magnetic, while sand is not. This property allows the magnet to attract the iron filings, effectively separating them from the non-magnetic sand.

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DOK Level 2: Skill/Concept

TEKS.SCI.5.6B

Describe what happens to the physical properties of salt and water when they are mixed to form a solution.

• The salt and water both change their physical properties

• The salt dissolves, but the water remains the same

• The water evaporates, leaving the salt behind

• Both the salt and water maintain their physical properties

Answer explanation

When salt is mixed with water, the salt dissolves, breaking into ions, while the water's physical properties remain unchanged. Thus, the correct choice is that the salt dissolves, but the water remains the same.

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DOK Level 2: Skill/Concept

TEKS.SCI.5.6C

How can you demonstrate that air is made up of particles too small to be seen?

• By weighing a balloon before and after inflating it

• By mixing air with water

• By freezing air

• By heating air

Answer explanation

Weighing a balloon before and after inflating it shows that air has mass. The increase in weight indicates that the air, made of particles too small to see, occupies space and contributes to the balloon's weight.

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DOK Level 2: Skill/Concept

TEKS.SCI.5.6D

Plan an experiment to compare the relative density of oil and water.

• Mix oil and water and observe which one floats

• Heat both oil and water and measure their boiling points

• Freeze both oil and water and measure their freezing points

• Measure the mass of equal volumes of oil and water

Answer explanation

Mixing oil and water allows us to observe that oil floats on water, indicating that oil is less dense than water. This direct observation effectively compares their relative densities.

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DOK Level 3: Strategic Thinking

TEKS.SCI.5.6A

Reason why a mixture of sand and water can be separated by filtration.

• Sand dissolves in water

• Sand is heavier than water

• Sand does not dissolve in water

• Water evaporates leaving sand behind

Answer explanation

Sand does not dissolve in water, allowing it to remain as a solid while water passes through the filter. This property enables the separation of sand from water using filtration.

Tags

DOK Level 3: Strategic Thinking

TEKS.SCI.5.6B