Chem Test Review

How many atoms of carbon (C) are in C₆H₁₂O₆?

• 3
• 6
• 12
• 24

The substances at the beginning of a chemical equation are called the ____

• product
• yield
• chemical symbol
• reactants

Is the following equation balanced or unbalanced ? 
N₂ +3 H₂ --> 2NH₃

• Balanced
• Unbalanced

Which of the following changes gives NO evidence that a chemical reaction has taken place?

• A cube of solid forms a puddle of liquid
• A certain liquid is added to a solid, and bubbles of gas form.
• Two liquids are mixed, and a precipitate forms.
• Heating a blue solid turns the solid white.

Which of the following models best demonstrates a balanced chemical equation?

• F
• G
• H
• J

In the picture, what is the atomic number for Sodium?

• 11
• 22.9
• Na
• none of the above

What two particles are inside the nucleus of an atom?

• Protons and Neutrons

• Electrons and Protons

• Electrons and Neutrons

• all of them

This is an example of a physical change

• a nail rusts

• water changes states

• fire cracker exploades

• a color forms when mixing two acids

Density is

• Length x Height x Width
• measured in kilograms
• mass per volume
• the amount of space an object takes up

Where are the most reactive elements found on the periodic table?

• Group 1
• Period 1
• Groups 13 through 16
• Group 18