When a junked car is compacted, which statement is true?

A
Its mass increases.

B
Its mass decreases.

C
Its density increases.

D
Its density decreases.

Topic Flashcards

Click to Flip

Question

A solid metal cube is heated until it melts into a liquid. Assuming no spills, what happens to its density and why?

Answer

Its density decreases. While its mass is conserved, heating causes the atoms/molecules to spread out, increasing the volume. Since density = mass/volume, the density decreases.

Question

You hammer a piece of iron into a flat sheet. Has the iron's specific heat capacity changed? Explain.

Answer

No, it has not. Specific heat capacity is an intensive property that depends on the material itself, not on its shape or amount. Changing the form does not change this property.

Question

When you crush an empty aluminum soda can, you are applying a force that changes its shape. In this process, is the number of aluminum atoms in the can conserved?

Answer

Yes, it is. Crushing is a physical change that rearranges the material but does not create or destroy atoms. The mass (and therefore the number of atoms) remains constant.

Question

If you cut a block of clay in half, what happens to the density of one of the halves compared to the original block?

Answer

The density remains exactly the same. Both the mass and volume are halved, so the ratio (mass/volume = density) for the material is unchanged.

Question

A sponge is fully soaked with water, making it very heavy. When you squeeze it tightly, water streams out. What happens to the density of the remaining wet sponge in your hand?

Answer

Its density decreases. By squeezing out water, you are removing mass. The sponge's physical volume also decreases, but the proportion of mass lost is greater than the reduction in its porous volume, leading to a lower overall density for the sponge material + remaining water.

Mini Quiz

1 / 3

Is the density of a material always the same, regardless of how much of it you have?

When a junked car is compacted, which statement is true?

A
Its mass increases.

B
Its mass decreases.

C
Its density increases.

D
Its density decreases.

When a junked car is compacted, its density increases.

Topic Flashcards

Mini Quiz

Related Questions

When a junked car is compacted, which statement is true?

A Its mass increases. B Its mass decreases. C Its density increases. D Its density decreases.

When a junked car is compacted, its density increases.

Topic Flashcards

Mini Quiz

Related Questions

A
Its mass increases.

B
Its mass decreases.

C
Its density increases.

D
Its density decreases.