2. 7.1-.2 CHEMICAL REACTIONS & WRITING CHEMICAL EQUATIONS. JAKE T, JOSH, GABI

3. 7.1 CHEMICAL REACTIONS All chemical reactions involve changing substances. Reactants- substances that are started with Products- substances that are ended up with Reactants products Endothermic reaction- a reaction that uses up energy from its environment. Ex. Instant cold packs Exothermic reaction- a reaction that gives off energy to its environment. Ex. Heating pad

4. LAW OF CONSERVATION OF MASS Mass and atoms cannot be destroyed nor created. Only changed.

5. WHICH SIDE OF A CHEMICAL EQUATION HAS THE REACTANTS? 4Fe + 3O 2 2Fe 2 O 3

6. WORD EQUATIONS Reactants are written on the left and products on the right. Ex. Methane + OxygenCarbon dioxide + water Hydrogen peroxidewater + oxygen Iron + oxygen iron (III) oxide

8. CHEMICAL FORMULAS AND EQUATIONS Chemical equation- a shorthand method used to show the number and type of atoms present in the smallest representative unit of a substance. Skeleton equation- a chemical equation that does not indicate the relative amounts of reactants and products. Ex. H 2 O 2 (aq) H 2 O (l)+ O 2 (g)

9. WHAT SYMBOL DOES THIS REPRESENT? Delta Heat Cool Dissolved in water

10. CATALYST AND INHIBITORS Catalyst- Used to speed up a chemical reaction. Inhibitors- Used to slow down a chemical reaction. -Its formula is written above the arrow in the chemical equation. Examples of CatalystsExamples of Inhibitors PlatinumFormaldehyde Potassium Permanganate Acetanilide Manganese DioxideSalt (NaCl)

11. Is vinegar a catalyst or an inhibitor? Catalyst Inhibitor Hint: Vinegar is inside the jar.

12. PQP: Write the formulas and symbols needed to create the skeleton equation for this reaction: Carbon tetrahydride gas (methane) reacts with oxygen gas to produce carbon dioxide gas and dihydrogen monoxide liquid.