Interim 1 study guide

Match the following MODEL with the correct formula.

• H₂O

• NH₄

• H₂O₂

• O₃

Match the following MODEL with the correct formula.

• NH₃

• C₂H₆O

• CH₄

• H₂0

One of the signs of a chemical reaction taking place is:

• Bubbles are produced 
• Reactants are not combining
• Products are not forming
• Color is not changing

You know you a chemical reaction has occurred if 

• there is a precipitate.
• there is a color change.
• there is a temperature change.
• All of these answers are evidence.

Which of the following is an example that includes evidence of a chemical reaction?

• A sample of zinc is placed in water and it settles to the bottom
• A solid block of ice is heated and it completely melts into a liquid. 
• Sugar that is burned gives off an odor and turns brown and then black.
• A tomato is placed into a blender and chopped up into smaller pieces.

Which is NOT an indication of a chemical change?

• temperature change

• formation of a precipitate

• Phase change

• production of light

Ionic bonds happen because of the ____ of valence electrons.

• sharing

• transfer

• keeping

• covering

What coefficient should be used to make the following equation balanced?
N₂+O₂--> _NO 

• 1
• 2
• 3
• 4

How many Hydrogen are in 4H₂O?

• 6
• 8
• 2
• 4

How many Sodium (Na) are in 6NaCl?

• 1
• 12
• 6