Chapter 6.2Describing Chemical Reactions

What are chemical reactions?

• They use formulas!– Abbreviated way to show atoms that are bonded

together. NaOH and CO2 – Lets review these first See Chemical Formulas

Handout!

They also use equations!

• A chemical equation is like a recipe for a chemical reaction. 2 slices of bread 1 spoonful of

peanut butter1 sandwich+

Chemical Equation

Reactants + Reactants Products + Products

Conservation of Matter• Matter cannot be created nor

destroyed!• So you have to have the same

number of atoms at the end of the reaction as you did at the beginning.

• Its like students at a dance, you should have the same # -- or else someone died or crashed the party!!!

Open vs. Closed Systems

• Open system: things can escape into the surroundings

• Closed system: things cannot escape.

5 Types of Chemical RXNs