Test-2-Review

Define a physical change.

• A change to a substance that occurs without forming a new substance.

• A change in matter that produces one or more new substances.

• A change that undergoes a chemical reaction.

• None of the above.

Which of the following is a sign that a chemical reaction has occurred?

• change in shape

• formation of a gas

• melting

• dissolving

Convert the following: 
35 milliseconds to seconds

• 0.035 seconds
• 0.35 seconds
• 3.5 seconds
• 0.0035 seconds

What do these isotopes of carbon all have in common?

• neutrons & mass number
• atomic number and neutrons
• atomic number and electrons
• protons, atomic number, and mass number

How many neutrons in C-14?

• 6
• 7
• 14
• 8

A piece of wood is sawed in two.

• Physical Change

• Chemical Change

An iron shovel is rusting.

• Physical Change

• Chemical Change

Which is in order from smallest to greatest?

• km, m, cm, mm

• cm, m, mm, km

• mm, cm, m, km

• mm, m, cm, km

Density equals...?

• Mass divided by Area

• Volume divided by Mass

• Area divided by Mass

• Mass divided by Volume

The plum-pudding model describes atoms as...

• Having protons and neutrons evenly distributed throughout the volume of the atom.

• Having a small nucleus containing protons and neutrons.

• Having electrons evenly distributed throughout the volume of the atom.

• Having a small nucleus containing electrons and protons.