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 ObjectivesSWBAT 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…

PHYSICAL AND CHEMICAL

CHANGE LAB ANDHOMEWORK

REVIEW

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.

Let’s look at some mixtures…

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

LAB/NOTES TIME

Density and MagnetismKey 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 TECHNIQUESKey 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

Filtration

SEPARATION TECHNIQUESKey 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 TECHNIQUESKey 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 Question1. 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