Chem 1: Quiz 1

For questions 1-3: Identify if the following changes is a physical or a chemical change.

1. Converting water to water vapor

Answer explanation

Change in the state of water is a physical change.

For questions 1-3: Identify if the following changes is a physical or a chemical change.

2. Boiling an egg.

Answer explanation

Egg denaturation by boiling is an example of chemical change.

For questions 1-3: Identify if the following changes is a physical or a chemical change.

2. Rusting of iron

Answer explanation

Rusting of iron is a reaction between a iron and oxygen, signifying a chemical change.

Which of the following does not describe a solid-state of matter?

• it may have a regular or irregular shape.

• it has greater molecular content than a liquid state.

• it has a definite volume.

• it is more spacious than a liquid state.

Answer explanation

solids are less spacious than liquid

Which of the following is not a pure substance?

• water

• sand

• copper

• syrup

Answer explanation

Water & sand are compounds, copper is an element. Syrup is a mixture

You put 1 teaspoonful of salt in 500 mL of water. The salt is entirely dissolved. The resulting solution is a

• homogeneous mixture

• heterogeneous mixture

• compound

• element

The picture shown is an example of a

• homogenous mixture

• heterogeneous mixture

• compound

• element

Answer explanation

Heterogeneous. There are two distinct phases available. Ice (solid) and soda (liquid).

Write the correct chemical symbol of mercury.

Answer explanation

Hg is hydrargyrum, referring to mercury.

True/False: Solids have the strongest forces of attraction than liquids and gases.

• True

• False

Answer explanation

Solids have the strongest IFA due to high bond strength.

What is the most abundant element in the universe?