Chapter 6 Study Guide
Chemical Reactions
1.
You should know how to write a chemical formula
using your valence sheet.
Example: Sodium chloride Na +1 Cl -1 = NaCl
2. A chemical change
is when two or more substances react, or one substance
decomposes. In both cases
something new is formed. Evidence
of a chemical
change:
- Temperature change (exothermic or
endothermic)
- Color change
- Precipitate
forms
- Gas produced
(bubbles)
- Fire/Explosion
3.
A physical
change is a change in matter that does not produce a new substance like
cutting paper or mixing salt and pepper.
4.
You should know the structure of a chemical
formula. Be able to label reactants, products, yields sign, subscripts
and coefficients.
5.
Know that subscripts tell us the number of atoms
of an element and coefficients tell us the number of molecules of a substance.
6.
Law of
Conservation of Mass: Matter
is not created nor destroyed.
7.
You should know how to balance chemical equations.
8.
You should be able to identify the four major
types of chemical reactions: Synthesis,
Decomposition, Single Replacement, Double
Replacement, and Combustion.
9.
A catalyst
is a substance that speeds up a reaction but is not involved in the chemical
reaction. Be able to identify the
catalyst in a reaction.
