Question

1.) The density of iron is 7.8 g/cm3 and that of aluminum is 2.7 g/cm3. Using a balance, you find that a block of iron has the same mass as a block of aluminum. Which block has the LARGER volume?
Question 15 options:

You cannot tell from the information given.


The volumes are the same.


The iron block


The aluminum block
2.) Iron combines with oxygen and water from the air to form rust. If an iron nail were allowed to rust completely, you should find that the rust weighs

Question 20 options:

less than the nail it came from


the same as the nail it came from


more than the nail it came from


It is impossible to predict.
3.)What is the reason for your answer to the last question?

Question 21 options:

Rusting makes the nail lighter.


Rust contains iron and oxygen.


The nail flakes away.


The iron from the nail is destroyed.


The flaky rust weighs less than iron.

Answer 1

Answer:

1.) The aluminum block

2.) more than the nail it came from

3.) Rust contains iron and oxygen

Explanation:

1.)

Mass, Density, and Volume are related by the following equation;

Mass = Volume*Density

Solving for volume;

Volume = Mass/Density

If Mass is constant then;

Volume ∝ 1/Density ; That is volume and density will be inversely proportional. The larger the volume the smaller the density

2.)

If an iron nail were allowed to rust completely, you should find that the rust weighs more than the nail it came from since Iron combines with oxygen and water from the air to form rust.

3.)

Rust contains iron and oxygen.

Rust is composed or made up of hydrated iron(III) oxides Fe2O.