Upload
heather-stone
View
218
Download
4
Tags:
Embed Size (px)
Citation preview
It Was Here Just a Moment Ago!
It Was Here Just a Moment Ago!
STAAR Category 1Matter and EnergySTAAR Category 1Matter and Energy
•TEKS (8.5) The student knows that matter is composed of atoms and has chemical and physical properties. The student is expected to:
• (E) investigate how evidence of chemical reactions indicate that new substances with different properties are formed; and
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 precipitate.
• 5. The student will use models to explain chemical formulas.
ENGAGEENGAGE
•Balloon Gas–What happened?
Physical vs Chemical Change
Physical Changes
Alter the size &/or shape
Cut, grind, dissolve
Phase Changes
Physical ChangesPhysical Changes
Physical Changes
Easily changed back to original form
Chemical Changes•New stuff is made
•Cannot change new stuff back into original form easily
•Chemical composition of new substance is different from original
Raw ChickenRaw Chicken Cooked Cooked ChickenChicken
Physical or Chemical?Physical or Chemical?Write your explanation on page 7 of your Write your explanation on page 7 of your
IANIAN
Bellringer 10/14/2014- You must complete to do the
lab!
5 Evidences of Chemical Change1.Precipitate (2 clears make a
cloudy)2.Energy change (hot, cold, light,
sound, electricity, etc.)3.(Unexpected) Color Change4.Bubbles, fizzing, gas produced5.Smell Change
How to remember
• Please= Precipitate• Excuse = energy change• Burps = bubbles• Coughs = color change • Sneezes = smell change
#1 Precipitate
Two clear solutions make a cloudy solution
#2 Energy Change
As candle was burns, it gives off heat and light
#3 Color Change (Unexpected)
Colorless methane burns blue
#4 Bubbles or Fizzing
Alka Seltzer in Alka Seltzer in water makes water makes
carbon dioxide carbon dioxide gasgas
#5 Smell Change
Baked cupcakes smell differently Baked cupcakes smell differently than batterthan batter
Physical or Chemical?
You decide. . .
How do you know?How do you know?
Physical or Chemical?
You decide. . .
How do you know?How do you know?
Physical or Chemical?
You decide. . .
How do you know?How do you know?
Chemical Changes Foldable
•Chemical Changes Foldable- Glue to page 41
•Page 42: title- –“Chemical Changes Mini Labs 1 and 2”
•Page 43: title- –“Chemical Changes Mini Labs 3 and 4”
Mini Lab #1
• Materials: 15 mL of acetic acid, spoonful of sodium bicarbonate
• Prediction “I think ___________will happen when I mix acetic acid and sodium bicarbonate together.”
• Results:
Mini Lab #1
1. Use the graduated cylinder to add 15 milliliters of acetic acid to the baggie containing sodium bicarbonate. Close it tightly.
2. Observe the baggie with your eyes and hands as the change takes place.
3. Record evidence of a chemical change on your sheet.
Results
• A chemical change (did/did not) occur because ______________happened
Mini Lab #2
• Materials: 20 mL of water, 1/2 spoonful of sodium bicarbonate, 2 spoonfuls of calcium chloride
• Prediction: I think ____________ will happen when I mix water, sodium bicarbonate, and calcium chloride together.
Mini Lab #2
1. Mix a spoonful of sodium bicarbonate and a spoonful of calcium chloride together inside a plastic bag.
2. Use the graduated cylinder to add 15 ml of acetic acid to the bag. Close it quickly!
3. Observe the baggie with your eyes and hands as the change takes place.
4. Record evidence of a chemical change on your sheet.
Mini Lab #3
• Materials: 10 mL of acetic acid, 5 drops of universal indicator
• Prediction: “I think ____________will happen when I mix acetic acid and universal indicator together.”
Mini Lab #3
1. Add 10 ml of acetic acid to a graduated cylinder.
2. Pour the acetic acid into the small beaker.
3. Add 1 dropper of universal indicator or cabbage juice to the beaker.
4. Observe the beaker with your eyes and as the change takes place.
5. Record evidence of a chemical change on page 42 of your IAN.
EXPLOREEXPLORE
• Red Light – Green Light• For the Rust of My Life• Take a Powder• Clabbered Clumps• Witches Brew• Bubble, Bubble, Toil & Trouble• It’s All Aglow• Chemical Sunshine
– 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)
Evidence of Chemical Change
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)
ELABORATEELABORATE
• Mixing it Up• Irreversible Consequences
Bellringer 10/20/2014- pg 7 or 8
•What is a precipitate?
Homework
• Study for your vocabulary quiz (summative)!!! Quiz is on Wednesday!!!!
• Words: subscript, coefficient, chemical formula, alkali metal, noble gas, metal, nonmetal, metalloid, group, period, atom, proton, neutron, electron, valence electron
Classwork
• Atoms Retest (front of the room): Watch the Atomic model brainpop and complete the quiz
• Lab (back of the room): follow the lab directions for mini lab #6. If you complete you can finish any mini lab that you did not complete.
True or False
Chemicals are only found in chem labs
Fabulous Fact or Mystical Myth
Fabulous Fact or Mystical Myth
Chemistry runs everyone and everything!
True or False
Physical and chemical changes never happen at the same
True or False
Energy changes during a chemical reaction
always give off heat
Energy changes during chemical reactions can give off heat and get hotter, absorb heat and get colder, give off light, sound, and electricity, etc.
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?