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Bellringers - Chemical Reactions

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					   Bellringers - Chemical Reactions

1. Grades (2 slides)                    7. Concept review


2. Introduction to chemical equations
                                        8. Exploring misconceptions
(2 slides)

3. Physical & chemical change card
                                        9. Introduction to balancing equations
sort


4. Concept review                       10. Word study


5. Quick write, in the style expected
                                        11. Balancing equations
on state tests


6. Pre-lab (2 slides)                   12. Graphic organizer - concept review
Bellringer




Enter your grades on your grade graph. You
might also want to write yourself some notes.

Reflect on your effort and achievement.
 Bellringer, part 2

                                      Effort   Results
Getting started
Being ready to start
Completing bellringers

Daily assignments
Participating actively
Completing assignments thoughtfully

Processing
Thinking about what you did
Completing OUT activities

Homework
Keeping track of it
Doing them thoughtfully

Tests & quizzes
Taking seriously/studying
Thinking about questions & answers
Bellringer




This the chemical equation for photosynthesis

  6 CO2 + 6 H2O --> C6H12O6 + 6 O2
Bellringer, part 2



   6 CO2 + 6 H2O --> C6H12O6 + 6 O2
Make a T-chart that shows
   ✓What you can tell from this equation

   ✓Questions that you have about this
     equation or photosynthesis
Bellringer


Signs that a chemical change has occurred:

 ✓Change in color or odor

 ✓Formation of a gas or precipitate

 ✓Change in temperature or other form of
  energy

Then do card sort.
Bellringer




Give three examples each of

 ✓Physical change

 ✓Chemical change
Bellringer


How do you know that burning sugar is a
chemical change?

Describe at least two pieces of evidence that
burning sugar involves chemical
changes/reactions.

A.C.E. it - answer, cite concepts, explain your
answer.
Bellringer




See Pre-lab

 ✓Make a table and identify
  factors that could change
  the rate

 ✓Choose your variables for
  this lab
Bellringer, hints


Read ingredient list - what are the reactants?
What are the products?

What can you do to speed up or slow down the
reaction?

How can you test that as an experiment? What
is the independent variable? What is the
dependent variable? What variables do you need
to control?
Bellringer

When paper is burned - how does the mass
change? How does the energy change?



               Before              After


 Mass



Energy
Seedlings in a Jar

You have sealed a jar containing five bean
seeds, air and a wet paper towel. After 12 days,
the seeds have germinated
to form 6-cm seedlings. During
this time, the jar has remained
sealed; nothing could get in or
out of the jar.

How does the mass of the jar after 12 days
compare to its beginning mass? Explain your
thinking.
Bellringer - iron rusts

Use symbols to show the conservation of atoms
that occurs when iron rusts.

            Fe + O2 --> Fe2O3
                     O        Fe
             Fe             O O O
                     O
                              Fe
Keep adding atoms and/or molecules until the
atoms of each element on each side of the
equation are the same.
Bellringer - word study
Use the table of common prefixes, roots and
suffixes to predict the meanings of these
words.


                 predicted         picture
                 meaning       interpretation


 endothermic


 exothermic
Bellringer




Photosynthesis
_CO2 + _H2O + energy --> _C6H12O6 + _O2



Use coefficients to balance this equation.
Bellringer




             Complete the
             table to compare
             and contrast
             types of
             reactions

				
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posted:3/26/2012
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