it was here just a moment ago!
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It Was Here Just a Moment Ago!. TAKS Objective 3. Substances have chemical and physical properties. TEKS Science Concepts 8.9. The student knows that substances have chemical and physical properties. The student is expected to: - PowerPoint PPT PresentationTRANSCRIPT
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It Was Here Just a Moment Ago!
It Was Here Just a Moment Ago!
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TAKS Objective 3TAKS Objective 3
• Substances have chemical and physical properties.
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TEKS Science Concepts 8.9
TEKS Science Concepts 8.9
• The student knows that substances have chemical and physical properties. The student is expected to:
• (A) demonstrate that substances may react chemically to form new substances;
• (C) recognize the importance of formulas and equations to express what happens in a chemical reaction; and
• (D) identify that physical and chemical properties influence the development and application of everyday materials such as cooking surfaces, insulation, adhesive, and plastics.
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Learning ObjectivesLearning Objectives
• 1. The student will demonstrate chemical change as evidenced by a change in color.
• 2. The student will measure temperature change as the result of a chemical reaction.
• 3. The student will demonstrate a chemical reaction that produces gases.
• 4. The student will demonstrate a chemical change that results in the formation of a precipitant.
• 5. The student will use models to explain chemical formulas.
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True or False
Chemicals are only found in chem labs
MISCONCEPTIONSMISCONCEPTIONSMISCONCEPTIONSMISCONCEPTIONS
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Chemistry runs everyone and everything!
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True or False
Physical and chemical changes never happen at the same
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True or False
Energy changes during a chemical reaction
always give off heat
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Energy changes during chemical reactions can give off heat and get hotter, absorb heat and get colder, give off light, sound, and electricity, etc.
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Background
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Physical vs Chemical Change
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Physical Changes
Alter the size &/or shape
Cut, grind, dissolve
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Phase Changes
Physical ChangesPhysical Changes
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Physical Changes
Easily changed back to original form
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Chemical Changes•New stuff is made
•Cannot change new stuff back into original form easily
•Chemical composition of new substance is different from original
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Raw ChickenRaw Chicken Cooked Cooked ChickenChicken
Physical or Chemical?Physical or Chemical?Hint- Can you turn cooked chicken back Hint- Can you turn cooked chicken back
into raw chicken?into raw chicken?
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5 Evidences of Chemical Change
1.Smell Change2.Color Change3.Energy change (hot, cold, light,
sound, electricity, etc.)4.Bubbles, fizzing, gas produced5.Precipitate (2 clears make a
cloudy)
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#1 Smell Change
Baked cupcakes smell differently Baked cupcakes smell differently than batterthan batter
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#2 Unexpected Color Change
Colorless methane burns blue
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#3 Energy Change
As candle was burns, it gives off heat and light
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#4 Bubbles or Fizzing
Alka Seltzer in Alka Seltzer in water makes water makes
carbon dioxide carbon dioxide gasgas
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#5 Precipitate
Two clear solutions make a cloudy solution
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Physical or Chemical?
You decide. . .
How do you know?How do you know?
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Physical or Chemical?
You decide. . .
How do you know?How do you know?
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Physical or Chemical?
You decide. . .
How do you know?How do you know?
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ENGAGEENGAGE
•Balloon Gas–What happened?
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EXPLOREEXPLORE
• Red Light – Green Light• For the Rust of My Life• Take a Powder• Clabbered Clumps• Witches Brew• Bubble Bubble Toil & Trouble• Fireworks (do as demo)• Milk of Magnesia
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EXPLAINEXPLAIN
• Every reaction we did shows evidence of chemical change- what are 5?– Please- Precipitate (2 clears make cloudy)– Excuse- Energy change (heat, light, sound,
electricity)
– Coughs- Color change (unexpected)– Sneezes- Smell Change– Burps- Bubbles or fizzing (gas
produced)
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ELABORATEELABORATE
• Abracadabra• Sweet Models• Irreversible Consequences• Chemistry at Home
– List or digital/ paper photos in PPT or poster
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EVALUATEEVALUATE
•How many atoms of copper in 2 molecules Cu2O?
•What happens to atoms in chemical reactions?
•What physical properties can change in a chemical reaction?