1. Unit: Chemistry Lesson 2: Describing Chemical Reactions Essential Questions: 1.) What information does a chemical equation contain? 2.) How is mass conserved during a chemical reaction? 3.) What are three types of chemical reactions?

2. Translate the text message using complete words and sentences!
R u doin chem hw? IDK the chem symbol for H20. Txt me later. Thx.

3. Chemical Equation Information
A way to show a Chemical equation
chemical reaction,
using symbols instead
of words

4. A combination of Chemical formula symbols that represent the elements
in a compound
Chemical Formulas
The formula of a compound identifies the elements in the compound and the ratio of their atoms.

5. Modeling a Chemical Equation
Like a skateboard, a chemical equation has a basic structure. How many complete skateboards can be made from the parts pictured?

6. Structure of an Equation
“Reacts to form”
Reactant + Reactant → Product + Product
Beginning substances
Ending Substances

7. HNO3 + NaHCO3 --> NaNO3 + CO2 + H2O
2 H2 + O2 ---> 2 H2O
How many reactants do the equations have? How many products do the equations have?

8. Mass and Chemical Reactions
The total mass of the Law of conservation
substances stays the of mass
same before and after
the reaction

9. Conservation of Mass
In a chemical reaction, matter is not created or destroyed. What is the mass of iron sulfide produced by this reaction?

10. Matter can enter or Open system
escape to the
surroundings
Matter does not Closed system
enter or leave

11. Balancing Chemical Equations
Textbook pages

12. Chemical Reactions Two or more elements Synthesis or compounds combine
to make a new substance

13. Compounds break Decomposition
down into simpler
products

14. One element replaces Replacement
another element or two
elements in different
compounds trade places

15. Types of Reactions
What is
each type
of reaction represented?