Unit 3: Cool Chemistry Show. Essential Questions How do you determine whether a chemical or physical...
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Transcript of Unit 3: Cool Chemistry Show. Essential Questions How do you determine whether a chemical or physical...
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Unit 3: Cool Chemistry Show
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Essential QuestionsHow do you determine whether a chemical
or physical change has occurred?What characteristics are used to identify a
chemical reaction taking place?How are symbols used to write chemical
formulas of compounds?How are chemical equations written?What are endothermic and exothermic
reactions?How can the rate of a reaction be altered?What are properties of acids and bases?What are oxidation and reduction reactions?
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Chapter ChallengePresent an entertaining and informative
science show to other studentsContent will include physical/chemical
changes or acids/basesPresentation must include a
demonstration and an audience-appropriate explanation of the concepts
Written summary + directions for the show and explanations of the chemistry
You may work in groups, topics will be assigned
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Day 1: Chemical and Physical ChangeLearning Objectives
◦Learn to differentiate between chemical and physical changes
◦Make observations and cite evidence to identify changes as chemical or physical
◦Explore the new properties exhibited when new materials are made from combinations of two or more original materials
◦Design an experiment to test properties of different combinations of materials
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StarterHow do you know if a chemical
change or physical change has occurred?
Give 3 examples of each.Time: 15 minutes
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Activity 1Several stations are set up in the
back to observe chemical and physical changes.
Create a data table with three columns for the process you complete, observations and whether it is a chemical or physical change
Time: 60 minutes
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Activity 2You will do a lab write up for this
laboratory following the CERR model
Check wiki for what to include for write up
Time: 10 minutes
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Closing & Homework What is a physical change? Give 2
examples.What is a solution, solute and solvent?What is a chemical change? Give 2
examples.What “clues” can you look for to determine
if a chemical change has occurred or not?What is a saturated solution?Homework:
◦Chemistry to Go, pg. 777 #1, 2, 4, 5◦Preparing for the Chapter Challenge
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Day 2: More Chemical Changes Learning Objectives:
◦Observe several typical examples of evidence that a chemical change is occurring
◦Make generalizations about the combinations of materials that result in the same evidence
◦Make generalizations about materials that tend to react with everything and materials that tend not to react with anything
◦Practice careful laboratory techniques
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StarterWhich of the following will result
in a chemical reaction and why?◦Mix 1 cup flour, 1/3 cup sugar, 1 tsp
baking powder with 1 cup milk and 1 egg. Put the mixture in the oven and bake for 30 minutes
◦Add 2 drops of sodium carbonate to 2 drops of sodium sulfate
Time: 15 minutesPlease hand in homework from
last lesson
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Activity 1Move with your lab groupsComplete the table on page 780Read through steps 1-3 on page
779-781Time: 10 minutes
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Activity 2Move to the back lab benches.All the equipment is on the back
bench that you will need Complete steps 1-3, recording
your data along the wayWhen you are finished, clean up
and put the materials back where you got them
Time: 45 minutes
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Closing & HomeworkDiscuss the following questions in
your group:◦How do you test for oxygen, carbon
dioxide and hydrogen?◦What is a precipitate?◦What are acid-base indicators?
Homework◦Chemistry to Go, pg. 784 #1, 2, 3◦Preparing for the Chapter Challenge◦Lab report due on Thursday
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Day 3: Chemical Names and FormulasLearning Objectives:
◦Predict the charges of ions of some elements
◦Determine the formulas of ionic compounds
◦Write the conventional names of ionic compounds
◦Make observations to determine whether there is evidence that chemical changes occur on combining two ionic compounds
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StarterThe periodic table provides
valuable information for each of the elements.
Look at calcium on your periodic table in your text book.◦What information is provided on the
periodic table for calcium?◦What significance does this
information have?Time: 15 minutes
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Activity 1Write the formulas for the
following elements and how many protons they have:◦Copper, zinc, oxygen, silver,
nitrogen, magnesium, iron, aluminum, potassium, sulfur, gold, carbon, chlorine, hydrogen, iodine, calcium, sodium, lead
Time: 15 minutes
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Activity 2A compound is formed when a negative
ion (metal) and positive ion (nonmetal)bond
The formula for potassium bromide is KBr◦Write the formula for 4 other compounds that
are created from a group 1 element combining with a group 7 element
The formula for magnesium oxide is MgO◦Write the formula for 4 other compounds that
are created from a group 2 element combining with a group 6 element
Time: 15 minutes
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Activity 3If the values of the charge on a positive and
negative ion, the resulting formula for the compound is simply the chemical formulas
If the values are not the same, subscripts are used to balance them◦Example: Al2O3 – Al3+, O2-
◦Write the names and formula for the following compounds: Calcium and oxygen Aluminum and fluorine Boron and oxygen Calcium and chlorine
Time: 10 minutes
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Activity 4 Some ionic compounds involve
polyatomic ions◦Sulfate (SO4
2-, CO32-, NO3
-, NH4+, etc.)
Write the formula for the following:◦Potassium nitrate◦Potassium sulfate
Write the name for the following:◦(NH4)2SO4
◦LiNO3
Time: 10 minutes
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Activity 5Do chemical reactions occur
every time reactants are mixed?Complete the reactions and fill
out the table belowTime: 20 minutes
Water Vinegar Ammonia Heat (Make a guess)
Baking Soda
Baking Powder
Alka Seltzer
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Closing & HomeworkHow are ionic compounds
formed?What is a polyatomic ion? Give
an example of a compound with one.
Distinguish between an ionic and covalent bond.
Homework:◦Chemistry to Go, pg. 790 #1, 2, , 3,
6◦Preparing for the Chapter Challenge
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Day 4: Chemical Equations
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Day 5: Chemical Energy (60 mins)
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Day 6: Reaction Rates
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Day 7: Acids, Bases & Indicators
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Day 8: Colour Reactions
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Day 9: Summative Assessment