 Update your Table of Contents  Write your homework – leave it to be stamped  Divide page 16 into 4 squares and label each square: Element, Compound, Mixture, Solution  Turn your Chemistry Rap into the basket or get ready to perform it! WARM - UP DateSession # ActivityPage # 1/11 11 Element, Compound, Mixture, Solution 4-Square 16 Balancing Act 17 Practice Equations 18

Study Jams Video 1: Elements & Compounds Video 2: Mixtures & Solutions

QUICK RECAP Compounds, Mixtures, Solutions

 MUST be on the Periodic Table OF ELEMENTS  Pure substances made of only one type of atom  Combine to form all other types of matter  Examples:  Silver  Calcium  Oxygen Elements:

 Two or more elements combine during a chemical reaction  Must be combined in definite ratios  Chemical Change/Reaction  Examples:  Water  Salt  Sugar Compounds:

 Combination of 2 or more substances  Basic mixtures are NOT the same throughout – heterogeneous  Do not have to be combined in specific ratios  Physical Change  Can be liquid, solid or gas  Different types: ◦ Solutions ◦ Suspensions ◦ Colloids  Examples:  Soil  Fruit saladMixture

 A type of MIXTURE that is the same throughout - homogeneous  Solute- substance being dissolved  Solvent- substance doing the dissolving  Physical Change  Examples:  Salt water  LemonadeSolution: Salt = Solute Water= Solvent Salt Water= Solution

 A type of HETEROGENEOUS MIXTURE  Particles will not dissolve, insoluble, or are suspended  Examples:  Italian dressingSuspension:

 A type of HOMOGENEOUS SOLUTION  Have an “in between” texture  Examples:  Jell-O  PuddingColloid:

 Cool Whip Element, Compound, Mixture or Solution?

 Sugar = Element, Compound, Mixture or Solution?

 Gold Element, Compound, Mixture or Solution?

 Pebbles Element, Compound, Mixture or Solution?

 Methane – CH 4 Element, Compound, Mixture or Solution?

 Quick one question assessment to make sure you understand the difference between a compound, mixture and solution  Complete all parts of the assessment, make sure your name is on it and then bring it to me! Sum It Up!

So, Matter Can Change Form When Combined, BUT…The BIG Question Is: In a physical or chemical change, is new matter created, or does matter disappear?

Law of Conservation of Mass (Matter) Law of Conservation of Mass (Matter)- Matter cannot be created or destroyed, it can only change form So where does the wood go?

NaF NaF In other words, what goes in, must come out!

Chemical Reactions Reactants – Elements present at the beginning of a chemical reaction Product – Compounds formed by a chemical reaction

REACTANTSREACTANTS PRODUCTPRODUCT

NaF NaF The arrow indicates that a chemical reaction has occurred

Balancing Chemical Equations  Since matter can neither be created nor destroyed, the amount of reactants must always equal the amount of product

Balancing Chemical Equations  Before (Reactants)  After (Product) Na F = 1 NaF Na = 1 F F = 1

 STOP, THINK, DISCUSS…  If you weigh your elements before a chemical reaction, and the compounds afterwards and they do not have the same mass before and after what likely happened during the chemical reaction? But What If It Doesn’t?

2H 2 + O 2 2H 2 O  (Reactants)(Products) Chemical Formula Chemical Formula Subscripts Coefficient Subscript

What is that little number? Subscript – ◦ Shows how many atoms of an element are in a compound. ◦ When there is NO subscript there is only 1atom of that element. O2O2 NH 4 H2OH2O Li 3 F 2 NaCl K5N4C2K5N4C2

What is that big number in front? Coefficient – ◦ The number of molecules (compounds) involved in a chemical reaction H2H2 H2H2 O2O2 H2H2 O2O2 H2OH2O 2 2

So the coefficient tells you the number of molecules, but what about each atom?  You must multiply…it is like the distributive property in math! 2NH 4 5H 2 O 2Li 3 F 2 4NaCl2K 5 N 4 C 2 3O 2

Rules for Balancing Chemical Equations 1. You CANNOT change subscripts, ONLY coefficients H 2 + O 2 2H 2 O 2. It does NOT have to look the same on both sides, it only has to be balanced 3. You CANNOT split compounds to write in a coefficient: HCl 2

Rules to Balancing Chemical Equations 4. Only multiply through when it is a compound because they have already bonded 2H + Cl 2HCl NOYES 5. If it is a capital letter, they are each a separate element: H, C, O If it is a capital letter followed by a lower case letter, it is all one element: Cl, Li, Si

Steps for Balancing Chemical Equations  1. Divide the reactants from the products with a line.  2. Write down the chemical symbol of each of the elements on each side of the equation 2 H 2 + O 2 2H 2 O H = O = H = O =

Steps to Balancing Chemical Equations  3. Using the coefficients and subscripts write down the number of each element  4. If they are not balanced change the coefficients using trial and error. You will have to go back and forth between each side! 2 H 2 + O 2 2H 2 O H = 4 O = 2 H = 4 O = 2

Lets Practice P + O 2 P4O6P4O6

Lets Practice Na + O 2 Na 2 O

Lets Practice Al 2 O 3 Al + O 2

Lets Practice Cl 2 + KIKCl + I 2

 Update your Table of Contents  Write your homework – leave it to be stamped WARM - UP DateSession # ActivityPage # 1/15 12 Identifying Common Compounds 19

 Complete the Practice Worksheet

 Write your homework!!  Answer the following questions in your notebook: 1. What is the Law of Conservation of Matter? 2. What is the difference between a reactant and a product? 3. What is the difference between a coefficient and a subscript? WARM-UP

 Tutoring on Tuesdays 8:15!  Bring your own technology (BYOT) laptops, iPads ANNOUNCEMENTS & REMINDERS

REVIEW  BALANCING EQUATIONS

Rules for Balancing Chemical Equations 1. You CANNOT change subscripts, ONLY coefficients H 2 + O 2 2H 2 O 2. It does NOT have to look the same on both sides, it only has to be balanced 3. You CANNOT split compounds to write in a coefficient: HCl 2

Rules to Balancing Chemical Equations 4. Only multiply through when it is a compound because they have already bonded 2H + Cl 2HCl NOYES 5. If it is a capital letter, they are each a separate element: H, C, O If it is a capital letter followed by a lower case letter, it is all one element: Cl, Li, Si

Steps for Balancing Chemical Equations  1. Divide the reactants from the products with a line.  2. Write down the chemical symbol of each of the elements on each side of the equation 2 H 2 + O 2 2H 2 O H = O = H = O =

Steps to Balancing Chemical Equations  3. Using the coefficients and subscripts write down the number of each element  4. If they are not balanced change the coefficients using trial and error. You will have to go back and forth between each side! 2 H 2 + O 2 2H 2 O H = 4 O = 2 H = 4 O = 2

Lets Do One Together… Na + O 2 Na 2 O

REVIEW  You and your partner will share a laptop to play the review games listed on your desk.  Groups of 6 will come up to work with me to practice balancing equations.

EXPECTATIONS  I expect you and your partner to play only what you are supposed to without being disruptive in any way!!  When you are working with me you are expected to complete the equations.  Be careful with the laptops and store them properly when we are done!!

Lets Practice: Part D - #1 Na + MgF 2 NaF + Mg

Lets Practice: Part D - #2 Cl 2 + KIKCl + I 2

Lets Practice: Part D - #3 HCl + NaOH NaCl + H 2 O

Lets Practice: Part D - #4 Na + NaNO 3 Na 2 O + N 2

Lets Practice: Part D - #5 PbBr 2 + HCl HBr + PbCl 2

REVIEW  Try 6, 7 & 8 on your own, and then check the answer key

Lets Practice: Part D - #6 Na 3 P + CaF 2 NaF + Ca 3 P 2

Lets Practice: Part D - #7 AlBr 3 + K KBr + Al

Lets Practice: Part D - #8 CaF 2 + Li 2 SO 4 CaSO 4 + LiF