Reactions Quiz 1 REVIEW

Notebook p.56 MgNO3 In this compound, how are the atoms sticking together? Why are elements from group 18 never in a compound?

Chemical Bonds Atoms are connected by their valence electrons creating chemical bonds.

They each have ____ valence electrons

There are __chemical bonds 6

Anything that has mass and volume is Matter Question 1

In a chemical reaction the ______ between atoms change. BONDS Question 2

Chemical bonds are connections atoms make using their VALENCE ELECTRONS Question 3

The group that has the maximum valence electrons and doesn’t need to make any bonds is the INERT GASES Question 4

This atoms has ____ valence electrons. 5 Question 5

Notebook p.58 What is the difference between a chemical and physical change?

Chemical Changes Chemical changes change the bonds between atoms and create new substances.

In a chemical change when the new substance forming you might see: Gas Forming Color change Temperature change

Physical Changes Melting, Freezing, Dissolving, Ripping, Squeezing are all physical changes. Why? There are NO bonds broken and NO new substances made.

Chemical reactions are important because they make NEW SUBSTANCES Question 6

Besides burning, what is an example of a chemical change? Question 7

Besides ripping paper, what is an example of a physical change? Question 8

What are 3 things you need to know to pass this quiz? Be specific.