• 8th grade Chemistry Formula Tasks

     
     
     
     
     TASK C-1     11-18
    A 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? 
     ionic
     
     
     
    Task C-2       11-19
    The e- between the symbols counts for both atoms!
    1.  Which bonding SHARES e-?
    2.  Which bonding STEALS e-?
    3.  Draw dot diagram for CO2
     
     
    TASK C-3      11-20
    Polar 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_
     
     fly  
     

      Polarity Video

     
     
     TASK C-5     11-21
    Endothermic 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

     

    Chemical equations need to be balanced.
    "BALANCED" means there is the same number
    of each type of atom on both sides of the "yield" arrow.

    4H + 2O -> 2 H2O  

    COUNT THE ATOMS! 
    Reactants:  H=  ___   O = ____   
    Products: H=______  O=____
     
    Balance this equation:
     
      1   FeO3   +    3 CO -> ____ Fe + ____ CO2
     
       _____ Li + ______  O2  ->     _____  Li2O  
      
     
     
     
    Task C-7       12-3
    You can only increase the coefficients by whole numbers.
     

    Balance: Make a chart!

    _____ O2 + _____ H2O   -->    ______   H2O2 
     

    __ C + __O  --> __CO2

    Balance Video

     
     
     
     
    Task C-8       12-4
    Mid-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 CO2 
     
    Balance
     
    2.  ___ C3H8 + ___O2 ---> ___H2O +___ CO2
     
     
     
    TASK C-9         12-5
    Equations must be in lowest terms of whole numbers.
    No decimals. 
    If you can divide ALL the coefficients by 2 or 3, DO IT!
    fly  
    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   12-6
     
    BALANCE: 
     
    1.  ___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 + __PbCl2
     
     
     
     
     
     
    Test tomorrow on dot diagrams and a little balancing.
     
     
     
     
    http://earthguide.ucsd.edu/eoc/special_topics/teach/sp_climate_change/images/burning_gasoline.jpg 
     
     
     
    Task C-11  12-9
     
     
    Carbon 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  -->  ____ NH3
     
     
     
    fly
     
     
     
     
     
     
     
    Task C-12        12-10
     
     
    Humans are causing the climate to get hotter.
     
     
    This is causing changes to our weather patterns. 
     
     
    1.  Draw N2 AND HCl dot diagram.
     
     
     
     
    FLY
     
     
     
     
     
      
     
     
     
    Task C-13    12-12
     
    Use your periodic table to list for Oxygen the number and charge:
     
    Protons = 
     
    Electrons = 
     
    Neutrons =
     
    atomic mass = 
     
    symbol = 
     
     
     
     
     
     
     
     
    Task C-14     12-13
     
     
     
    1.  Where was the fossil fuel's carbon before it became CO2 in our air?
     
    2.  What will happen because we increase the CO2 in our air?
     
     
     
    2016, 2015, and 2014 were the warmest years EVER.
     FLY
    Annual global temperature difference from long-term average, 1880 to 2018. (NOAA)
     
     
     
    fly
     
     
    Task C-15     12-14
     
    An 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 explained
     
     
    https://www.youtube.com/watch?v=tNvP3-174_M
     
     
     
     
     
     Task C-16      12-17
    1.  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 +  Br2
     
    Draw dot diagrams
     
    CO2         CH4           NH3
     
    Ionic, predict ratio:
     
    Mg + Cl        Na + O 
     
     
     
     
     
     
     
     
    Task C-17        12-19
     
     
    Task C-17     12-18
     
    Use 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 metals
    with an electrolyte between.  
    Electrolytes - acids that allow ions to move, but slows electrons 
     
    FLY
     fly
     
     
     
     
     
     
     
     
     Last chemistry task!  Now is a good time to replace your notebook!
     
     
     
     
    Task C-18           12-20
    Tomorrow the direct rays of the sun
    reached 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 sun
           AFTER the Summer Solstice?
    4.  What is it like at the North Pole on that day?
     
     
     
     
     
     
     
     
     
     Task C-18
    Both acids and bases react by dissolving things.
    Acids taste sour...  ie sour patch kids
    Bases taste bitter... ie soap, broccoli
    Your 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 6.02x1023
     
    This is equal to 12 grams of carbon-12.
      
     
    Balance:
     
     ______C3H8 +____ O2 -->_____ H2O + _____CO2
     
     
     
     TASK C-13      11-29
     
     Moles can be elements, molecules, or compounds.  
     
    You can add the elements mass together for a compound.
     
    CO2 = 1 carbon + 2 oxygen = 12g + 2(16g)=  44g
     
    One 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    11-30
     
    Electricity 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   12-1
     
     Open system - allows matter and energy to move in and out
     
    Closed system - does NOT allow energy and matter to move in and out
     
    1.  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         12-5
    Test on balancing and conservation of mass Thursday.
    In the mass conservation lab, you should have discovered the reactants
    mass 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         12-7
     
    Polar 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. 
     
       fly  
    Task C-18      12-8
     
     
     Task C-19         12-9
    Acids 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    12-12
     
    1.  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    12-13
     
     C-22         12-14
    Batteries turn chemical energy into electrical energy.
    Your nervous system uses electricity to control your muscles.
     
     
     
    TASK C-23   12-15
     
    1.  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       12-16
     
    4.  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  12-19
    Thursday 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         12-20
    Humans are changing the Earth's climate by adding CO2
    to 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    12-21
    This 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 tasks  
    TASK C-14      12-20
    There 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      12-22
     
      
     
    Answer question, then read articles in schoology. 
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
    End of current tasks 
     

    TASK C-
    Chapter 2 test 12-10.
    Mid-Term exam 12-17.

     
     
    Task C-3


    Balance:

       H +    S2 +     O8 ->   HSO2
     
    Task C-4
     
     
     
     
     
     
     General review          (This is advanced, if you need a more basic review go to my earlier Task page)
     
     
    A covalent bond forms when atoms
     
    share their valence electrons.
     
     
    Both atoms can count the same
     
    electrons to fill their outer shell. 
     
     fly
     
     
     
     


    Task C-5
    What is the conservation of mass?
     
     
     
     
     
     
     
    TASK C-7
    Use your old tests to begin to prepare for next Tuesday's mid-term.
    How many meters are in a kilometer?



    Sodium Video
    Atom Review
    Periodic Table Review
    Molecule Review
    Oxygen

    Great Balancing Site

    Carbon Cycle


    TASK C-9
    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.    

    TASK C-10
    What is the tool and the base unit for each:
    1. length
    2. mass
    3. volume
    4. density
    Study for your mid-term!

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