8th grade Chemistry Formula TasksTASK C-1 11-18A crystal is a orderly repeating arrangment of atoms.Both ionic and covalent bonds make crystals.Metals (+) bond with non-metals (-) making a salt.1. Why don't metals and non-metals make covalent bonds?Task C-2 11-19The e- between the symbols counts for both atoms!1. Which bonding SHARES e-?2. Which bonding STEALS e-?3. Draw dot diagram for CO2TASK C-3 11-20Polar molecules are molecules that act like tiny magnets.One end is negative because the electrons - are at the edge.Other end is positive because the nucleus + is at the edge.Polar molecules cause surface tension.1. What is more dense, water as a solid or liquid?2. Draw a dot diagram for and complete formula:_H + _O -> _H_O_TASK C-5 11-21Endothermic reactions absorb heat.
Exothermic reactions release heat.1. Is this endothermic or exothermic?draw dot diagram of CH4:__ CH4 + ___ O2 ---> ___ H2O + ____CO2 + heat energy
Task C-6 12-2"BALANCED" means there is the same numberof each type of atom on both sides of the "yield" arrow.
4H + 2O -> 2 H2OCOUNT THE ATOMS!Reactants: H= ___ O = ____Products: H=______ O=____Balance this equation:1 FeO3 + 3 CO -> ____ Fe + ____ CO2_____ Li + ______ O2 -> _____ Li2OTask C-7 12-3You can only increase the coefficients by whole numbers.
Balance: Make a chart!_____ O2 + _____ H2O --> ______ H2O2
__ C + __O --> __CO2Task C-8 12-4Mid-Term is in 9 classes, 12-18!SI system, conversion, chemical and physical changes, solids, liquids gasses, reading periodic table, ionic and covalent bonds and dot diagrams, balancing equations.(DRAW DOT DIAGRAM)
1. Draw CO22. ___ C3H8 + ___O2 ---> ___H2O +___ CO2TASK C-9 12-5Equations must be in lowest terms of whole numbers.No decimals.If you can divide ALL the coefficients by 2 or 3, DO IT!This is combustion of gasoline.1. What are the products?2. Does either of the products cause a problem?3. Is it correctly balanced?When done, install Classroom app from Self Service.Use 1112 to join my period 5 class.Must have Always, always, BT on!Task C-10 12-61. ___H2O + ____CO2 + light -> ___ C6H12O6 +__ O2
2. What do we call this reaction (#1)?
3. Why is it important to us (animals)?4. ___ Pb(OH)2 + ____ HCl --> ___ H2O + __PbCl2Test tomorrow on dot diagrams and a little balancing.http://earthguide.ucsd.edu/eoc/special_topics/teach/sp_climate_change/images/burning_gasoline.jpgTask C-11 12-9Carbon dioxide holds heat into the Earth's atmosphere.We release CO2 into the air when we burn fossil fuels.1. Why do fossil fuels increase CO2 but we don't?2. Where did fossil fuels get their carbon?3. BALANCE:___ H + __2__ N --> ____ NH3Task C-12 12-10Humans are causing the climate to get hotter.This is causing changes to our weather patterns.1. Draw N2 AND HCl dot diagram.Task C-13 12-12Use your periodic table to list for Oxygen the number and charge:Protons =Electrons =Neutrons =atomic mass =symbol =Task C-14 12-132. What will happen because we increase the CO2 in our air?2016, 2015, and 2014 were the warmest years EVER.Annual global temperature difference from long-term average, 1880 to 2018. (NOAA)Task C-15 12-14An acid is a H+A base is a OH-So when water is split,one is an acid and the other is a base.Acids steal electrons.Bases give electrons.1. What have you "heard" acids do?Acid/base explainedhttps://www.youtube.com/watch?v=tNvP3-174_MTask C-16 12-171. What is the base unit for mass, length, and volume?2. 1km = ___ m 100cm = ____ m _____ mm = 1 m?3. What tools measure mass, length, and volume?Balance:AlBr3 + Cl2 → AlCl3 + Br2Draw dot diagramsCO2 CH4 NH3Ionic, predict ratio:Mg + Cl Na + OTask C-17 12-19Task C-17 12-18Use your periodic table to list for Oxygen the number and charge:Protons =Electrons =Neutrons =atomic mass =symbol =Acids are used in batteries to create electricity.Batteries produce electricity by using two different metalswith an electrolyte between.Electrolytes - acids that allow ions to move, but slows electrons
Last chemistry task! Now is a good time to replace your notebook!Task C-18 12-20Tomorrow the direct rays of the sunreached the farthest south on the Earth.They will continue north until the Summer Solstice.We have the shortest day and longest night on the Solstice.Humans have celebrated the solstice since before recorded history.1. Why does the amount of daylight change?2. What are the equinoxes?3. What will happen to the direct rays of the sunAFTER the Summer Solstice?4. What is it like at the North Pole on that day?Task C-18Both acids and bases react by dissolving things.Acids taste sour... ie sour patch kidsBases taste bitter... ie soap, broccoliYour stomach has hydrochloric acid that dissolves your food.NEVER TASTE ANY CHEMICALS TO SEE IF THEY ARE ACID OR BASE!A mole of atoms is 6.02x1023This is equal to 12 grams of carbon-12.Balance:______C3H8 +____ O2 -->_____ H2O + _____CO2TASK C-13 11-29Moles can be elements, molecules, or compounds.You can add the elements mass together for a compound.CO2 = 1 carbon + 2 oxygen = 12g + 2(16g)= 44gOne mole of CO2 has a mass of 44g.1. What is the mass of one mole of water?2. If we have a mass of 6.94g in one mole, what element is it?Task C- 14 11-30Electricity is the flow of electrons.Electricity needs ions in the water to provide a path for electrons.Pure (distilled) water does not conduct electricity.1. How does an atom turn into an ion?2. Why is an ionic bond between a metal and a nonmetal?3. Why do only nonmetals form covalent bonds?Task C-15 12-1Open system - allows matter and energy to move in and outClosed system - does NOT allow energy and matter to move in and out1. Why do we put a lid on a pot that is on the stove?2. Is a soda can an open or closed system?3. Is a fireplace an open or closed system?Task C-16 12-5Test on balancing and conservation of mass Thursday.In the mass conservation lab, you should have discovered the reactantsmass did NOT equal the mass of the products.1. Where did the mass go?2. Was it an open or closed system?TASK C-17 12-7Polar molecules are molecules that act like tiny magnets.One end is negative because the electrons - are at the edge.Other end is positive because the nucleus + is at the edge.Task C-18 12-8Task C-19 12-9Acids can be H3O+Bases can be OH-Acid can taste sour.Citric acid makes sour patch candy.Bases taste bitter. Soaps and broccoli are bases.TASK C-20 12-121. Why doesn't pure water allow electricity to flow?2. Why does adding salt to pure water allow the flow of electricity?Task C-21 12-13C-22 12-14Batteries turn chemical energy into electrical energy.Your nervous system uses electricity to control your muscles.TASK C-23 12-151. What is the base unit for mass, length, and volume?2. How many meters in a kilometer?3. What tools measure mass, length, and volume?TASK C-24 12-164. How many milligrams in a gram?5. Convert 100000 cm to km.6. If a rock is 50ml and 100g, what is the density and will it float?Task C-25 12-19Thursday is Mid-Term.The mid-term will include: SI, base units, mass, volume, density,and weight and tools for each.Centi, milli, and kilo with conversions.Periodic table and atomic basics including valence electrons,ionic and covalent bonds, balancing.1. HOW MANY OUNCES ARE IN 3.5 POUNDS?2. HOW MANY INCHES ARE IN 50 FEET?Task C-26 12-20Humans are changing the Earth's climate by adding CO2to the air by burning fossil fuels.This will change the weather patterns for the rest of your life.There will be floods, droughts, major storms.It will be increasingly difficult to feed the 7.5 billion people on the Earth.TASK C-27 12-21This is the last task of 2016. Reflect on what you have learned...Yesterday we discussed climate change,humans are changing the climate by burning fossil fuels.1. Why do you think we continue to burn fossil fuels?End current tasksTASK C-14 12-20There have been five great extinctions in Earth's past.Over 80% of the species that were living died off.There are currently more species going extinct at a faster rate than any of them.This is the only extinction that is caused by a single species.Task C-15 12-22Answer question, then read articles in schoology.End of current tasks
TASK C-Chapter 2 test 12-10.
Mid-Term exam 12-17.
H + S2 + O8 -> HSO2Task C-4A covalent bond forms when atomsshare their valence electrons.Both atoms can count the sameelectrons to fill their outer shell.
What is the conservation of mass?
Use your old tests to begin to prepare for next Tuesday's mid-term.
How many meters are in a kilometer?
Periodic Table Review
Great Balancing Site
The mid-term will include: SI, base units, mass, volume, density, and weight and tools for each. Centi, milli, and kilo with conversions. Periodic table and atomic basics including valence electrons, ionic and covalent bonds, balancing.
What is the tool and the base unit for each:
Study for your mid-term!