Experiments with water

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Questions and Answers

Which factor most directly determines whether an object will float or sink in a liquid?

  • The weight of the object
  • The shape of the object
  • The volume of the object
  • The density of the object relative to the liquid (correct)

Why does an object float when the weight of the displaced liquid equals the weight of the object?

  • The liquid's surface tension supports the object.
  • The density of the object increases.
  • The object becomes lighter in the liquid.
  • The buoyant upward force is equal to the gravitational force on the object. (correct)

If a block of aluminum and a block of iron have the same volume, which statement is true?

  • The iron block will be heavier because iron is denser than aluminum. (correct)
  • They will both float in water.
  • They will both sink in water.
  • The aluminum block will be heavier because aluminum is stronger than iron.

Which of the following materials is least likely to sink in water, assuming equal volumes?

<p>Bamboo (A)</p> Signup and view all the answers

Archimedes is best known for what contribution related to density?

<p>He discovered the relationship between density, volume, and displacement. (C)</p> Signup and view all the answers

What is the relationship between how tightly a material is packed and its density?

<p>The tighter the material is packed, the higher its density. (C)</p> Signup and view all the answers

If two objects are the same size but have different densities, what can be said about their masses?

<p>The object with the higher density will have a greater mass. (D)</p> Signup and view all the answers

Which of the following is an example of a material that is less dense?

<p>Styrofoam (D)</p> Signup and view all the answers

If an object floats, what is the relationship between the density of the object and the density of the fluid it is in?

<p>The objects density is less than the density of the fluid. (D)</p> Signup and view all the answers

Density is a measurement of what?

<p>How tightly something is packed together. (A)</p> Signup and view all the answers

Flashcards

What is Density?

Measurement of how tightly a material is packed together; compares the mass of things to their size.

Who was Archimedes?

Greek mathematician who discovered density.

What are dense materials?

Materials that are packed more tightly together.

What are less dense materials?

Materials that are not packed tightly together.

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What must happen for an object to float?

It must displace an amount of liquid equal to its weight.

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What is the condition for objects to float?

The object's density is less than the liquid's density.

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What are Soluble Substances?

Substances that dissolve in a solvent.

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Liquids.

Materials that are in a form that can be poured easily.

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Acid.

Lemon.

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Sal.

Salt.

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Study Notes

  • Experiments with water

Points to remember

  • Density measures how tightly a material is packed together.
  • Density compares the mass of items with their size.
  • Archimedes, a Greek mathematician, discovered density.
  • Iron, platinum, and lead are examples of dense materials.
  • Glass, bamboo, aluminum, and styrofoam are less dense materials.
  • An object is more dense than the liquid it is in
  • Liquids, solids, and liquids

Solubility

  • Soluble substances can dissolve in a solvent.
  • Sugar, salt and ink are soluble.
  • Insoluble substances cannot dissolve.
  • Tarces is insoluble

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