Catalyst – November [prime # between 8 & 13] Resume, P/C Change HW Out Please 1. Which of the...
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Transcript of Catalyst – November [prime # between 8 & 13] Resume, P/C Change HW Out Please 1. Which of the...
Catalyst – November [prime # between 8 & 13]
Resume, P/C Change HW Out Please
1. Which of the following is evidence of a CHEMICAL change?
crumpling aluminum foil, lathering shampoo on yo head, or passing gas
2. How is our tap water made ready for us to drink? What substances are taken out of it or added to it before we drink it?
Today’s Agenda
Catalyst Review Phys/Chem Change Lab
and HW Separating Mixtures Notes and
Lab Exit Question
HW TONIGHT: SEPARATION SLIP, STUDY FOR QUIZ!
Today’s Objectives
SWBAT separate mixtures using differences in physical properties.
QUIZ 6.1 TOMORROW!LCM
PHYSICAL AND CHEMICAL CHANGE MIXTURES AND
SEPARATION
Review
Physical or Chemical Change?
A physical change is a change, but only physical properties change
A chemical change is also a change, but it forms a new substance
Evidence of Physical Change
Bending, breaking, smashing, freezing, melting, evaporating,
crushing, cutting, tearing, sanding, grinding, mixing, separating, dissolving...
Evidence of Chemical Change
Fizzing, burning or combustion, corrosion, production of odor, heat,
cold, light, rust, solids, smoke, decomposition, oxidation, rotting,
digestion…
Mixtures….of whaaaaat?!?!?
Key Point #1: Mixtures are PHYSICALLY combined, so they can be PHYSICALLY separated.
A mixture is a combination of two or more substances in which each substance keeps its individual chemical properties.
Why is separation of mixtures so important in chemistry?
When you perform reactions, you must often isolate certain products…
Real-Life Examples of Separating Mixtures Separating components of blood
Separating oil from water in an oil spill
Getting drinkable water in third world countries
How you do that?
Key Point #2: Chemists separate mixtures by using differences in physical properties of each part.
Physical Properties: Size Density Solubility Magnetism Boiling Point
Think about DIFFERENCE in Properties! Size:
Ex: a polar bear and a butterfly Density: Will it float or sink in water? OR
Which is more dense? Ex: toothpicks and coins; Ex: water and oil
Solubility: Will it dissolve in water? Ex: rocks and sugar
Magnetism: Is it magnetic? Ex: paper and metal clippings
Boiling Point: At what temperature does it boil? Ex: water (100ºC) and alcohol (82.5ºC)
Separation Group Challenge! Problem: You have a mixture of sand, salt, wood
chips, and iron fillings. It is your job to successfully separate all of these components. Write a plan for how you would do this!
Possible Materials to use: Magnets Distilled water Funnel Filter paper Hot plate Watch glass Spoon Beaker
Density and Magnetism
Key Point: You can separate mixtures based on differences in density and magnetism.
Density
Based off differences in density, you can separate liquids from each other
Ex: Oil and Water
Magnetism
Based on differences is magnetism, you can separate magnetic objects from non-magnetic objects
Ex: Rocks and Coins
SEPARATION TECHNIQUES
Key Point: Filtration separates a solid from a liquid by filtering out the liquid.
What physical property is being utilized here?
Utilizes solubility, density, phase of substances
Filtration
Based on differences in solubility, density, and phase, you can separate solids from liquids using filtration
Ex: Sand and waterEx: Spaghetti and water
SEPARATION TECHNIQUES
Key Point: Crystallization separates a solid that has been dissolved in a liquid by boiling off the liquid.
What physical property is being utilized here? Utilizes different boiling points of each
substance
Crystallization
Based on differences in boiling points, you can separate dissolved solids from liquids
Ex: Boil salt water to crystallize salt and evaporate water
SEPARATION TECHNIQUES
Key Point: Distillation separates two liquids from each other by boiling off one liquid at a time.
What physical property is being utilized here? Utilizes the differing boiling points of
each substance
Distillation
Based on differences in boiling points, you can separate two liquids from each other.
Liquid A has a boiling point of 100°C Liquid B has a boiling point of 110°C
How could I separate these two mixtures?
Independent PracticeIdentify the technique (magnetism, density,
filtration, distillation, or crystallization) you would use to separate the following mixtures:
(1) Remove rocks from an ocean water sample. (2) A solution of salt water.(3) A mixture of oil and water.(4) Isolate sugar from a sugar-water solution.(5) Salt and ammonium chloride mixture (salt is not
soluble in ammonium chloride).(6) A mixture of paperclips and rice.(7) A mixture of water and oil.
Reaction Challenge – HOMEWORK
BaCl2(aq) + Na2SO4(aq) BaSO4(s) + NaCl(aq)
1. Balance the reaction.2. If 45.0 grams of BaCl2 reacts with 77.4
grams of sodium sulfate, what should the mass of the products be? (Hint: LCM)
3. Write a plan for separating this mixture. THINK! What order should you go in when separating???
Exit Question
1. List 4 separation techniques you could use in chemistry.
HW TONIGHT: SEPARATION SLIP, STUDY FOR QUIZ!
Exit Question
1. Label the following as physical change (P) or chemical change (C).
A) wood rottingB) peeling a bananaC) painting your face blue and
gold for the baseball game