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, BUTThe 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 Doesnt? 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 multiplyit 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 Answer the following question in your notebook: What is the Law of Conservation of Mass? WARM - UP DateSession # ActivityPage # 1/15 13 Law of Conservation of Mass Activities 19 Balancing Equations Practice 20 Tutoring on Tuesdays 8:15please let me know if you plan on coming! Bring your own technology (BYOT) laptops, iPads for Thursday ANNOUNCEMENTS & REMINDERS REVIEW LAW OF CONSERVATION OF MASS (MATTER) Law of Conservation of Mass (Matter) Law of Conservation of Mass (Matter)- Matter cannot be created or destroyed, it can only change form What goes in, must come out! Law of Conservation of Mass (Matter) Lab Investigation Roles Group Leader Responsible for reading and making sure the group is following directions accurately and completing all parts of the lab Supply Manager gets and returns supplies and makes sure they are clean Measurement Technician gets and returns the scale balance and is responsible for accurate mass measurements Data Technician makes sure the group records the mass data before and after the experiment, assists measurement technician in calibrating the scale Law of Conservation of Mass (Matter) Lab Investigation Send your supply manager to get the lab kit and measurement technician to get the scale balance Group leader, read the directions carefully twice before starting!! WARNING: YOUR BALLOON IS ALREADY FULL OF BAKING SODA, DO NOT TIP IT INTO THE GRADUATED CYLINDER ACCIDENTALLY! Law of Conservation of Mass (Matter) Lab Investigation Clean-Up Balloons in the garbage Rinse graduated cylinder thoroughly Wipe up any spills Put all items back into your lab kit & put them on the counter Put scale balance back onto cart Make sure every group member has measurements and an explanation Law of Conservation of Mass (Matter) Analyzing Reactions Some chemical reactions are ENDOTHERMIC = absorb energy Some chemical reactions are EXOTHERMIC = produce energy How would you tell the difference? Endothermic Vs. Exothermic ENDOTHERMIC An endothermic process absorbs heat and causes the temperature around it to cool needs energy to occur Photosynthesis (needs energy from the sun) EXOTHERMIC An exothermic process releases heat and causes the temperature around it to rise occur spontaneously Release heat, sound or light energy 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 Complete the Practice Worksheet Update your Table of Contents Write your homework leave it to be stamped WARM - UP DateSession # ActivityPage # 1/ 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