Focus Activity: What is the conservation of matter? What does it show you? Homework: Read and Answer 6.2 questions 1, 2, 3 and Section 6.3 all questions due Wed

Place your model on the appropriate table around the room. Make sure your name is on it. Put your name(s) on your rubric and put the rubric on TOP of your model. There will be a sign up sheet coming around- fill in who you handed your project into and if it was an attachment/poster/shared on google docs.

Types of Chemical Reactions *Synthesis – The get together *Decomposition- The break up *Single Replacement- The Cheater *Double Replacement- The Swap *Combustion **The Red names are “helpful hints”

Reactants – beginning substance Products- Ending Substance

Coefficient- number placed in front of a chemical formula in an equation.

This compound must be a hydrocarbon- made of Hydrogen and Carbon.

H 2 0 and CO 2 will always be a product

CH O 2 → CO H 2 O ***All Combustion must have a hydrocarbon and 0 2 as reactants

Some fun with Chemical Reactions!!

Let’s React! Synthesis- what will be on the produce side? 2Na Na+ Cl Cl 2 → 2 NaCl (formation of table salt) Decomposition- what 2 elements/compounds are products? 2 H2O2 H2O2 → 2 H2O H2O + O2O2

Single Replacement/displacement Zn + 2 HCl → ZnCl 2 + H 2 Double Replacement/Displacement HCl + NaOH → NaCl + H 2 O

Combustion 2 CH 2 + O 2 → 2 C0 2 2H 2 O

Focus Activity: Describe in your own words why you think the different types of chemical reactions could be called “The Get Together”, “The Break Up”, “The Cheater”, and “The Swap”. Study for your quiz on Thursday- Information from Friday, Monday, Tuesday, and Wednesday’s notes will be on the quiz.

How to make a reaction occur… Activation Energy: minimum amount of energy needed to start a chemical reaction Rates of Chemical Reactions Surface Area – The more surface area that is exposed, the faster the reaction will occur- Example- chewing your food breaks it into smaller pieces with more surface area. It takes less time to digest your food. Temperature- The higher the temperature the faster the particles move. This means they interact more often and have more Energy. Example: Storing Milk in the fridge slows down reactions to stay fresher longer.

More ways to control a reaction Concentration- the amount of substance in a given volume. Increasing the concentration allows for more particles to react. Catalyst- material that increases the rate of reaction by lowering the activation energy Enzymes- Cells in your body that acts as catalysts. Inhibitor- material used to decrease the rate of a reaction

Every Chemical Reaction displays a change in Energy!!!!!

Time for Practice Worksheets!!

Answers to 6.1 1A. Physical Properties can be observed without changing the substance into another. Chemical Property: Characteristic of a substance that describes its ability to change into another substance. B. You could ask whether the black crust formed from silver and water? If it is, then the silver underwent a chemical change, because a new substance was formed. C. Chemical Bonds form between atoms that share, gain, or lose electrons, or bonds break and new bonds form. 2A. Change in color, precipitate forms, gas bubbles, change in texture, change in energy. B. Cooked eggs are solid, raw are liquid. Color changes. C. Both types of reactions show a change in energy. Endothermic absorbs energy, exothermic releases energy.

Answers to 6.2 1A. Formulas tell you the elements and compounds involved in the reaction, arrow means “Yields” and points to the products. + indications 2 or more reactants or products. B. Both reactants and products are written as formulas. Reactants are placed to the left of the arrow and products are on the right. 2A Conservation of Mass means no matter is created or destroyed during a chemical reaction. B 250g 3A. Synthesis, decomposition, and replacement B 2 C Synthesis

Answers to 6.3 1A Minimum amount of energy needed to start a chemical reaction. B All chemical reactions need a certain amount of activation energy to get started. C Students might say that both endothermic and exothermic reactions need a similar level of activation energy in order to begin. 2A Chemists can control the rates of chemical reactions by changing factors such as surface area, temperature, and concentration, and by using substances called catalysts and inhibitors. B Sugar crystals, because more particles of sugar are exposed than in a sugar cube.