Messing with Mixtures Lab

M U LT I - PA RT L A B

MESSING WITH MIXTURES LAB

HOW CAN YOU SEPARATE THESE MIXTURES?

SEPARATING MIXTURESMixture Separation

MechanismPhysical Properties that allow separation

Sand & Iron FillingsSaladSalt and WaterMuddy WaterDust in Air

SEPARATING MIXTURESMixture Separation

MechanismPhysical Properties that allow separation

Sand & Iron Fillings

Magnet Iron is a magnetic metal

Salad Tongs Size and ColorSalt and Water Heater Boiling Pt.

(Water evaporates)

Muddy Water Filter Particle SizeDust in Air Filter Particle Size

HOMOGENEOUS OR HETEROGENEOUS?

HOMOGENEOUS OR HETEROGENEOUS?

•Sand and Iron Filings•Salad•Salt and Water•Muddy Water•Dust in Air

Homogeneous

HeterogeneousHeterogeneous

HomogeneousHeterogeneous

IDENTIFY THE SOLUTES AND SOLVENTS

Solute SolventOcean Water- Salt, WaterKool-Aid- Powder, sugar, and waterAntifreeze- Water and ethylene glycolLemonade- Water, Lemon Juice, and sugar

Soda Pop- Syrup, water, and CO2 gasAir- Nitrogen, oxygen, other gasesGold Jewelry- gold, copperSterling Silver- Silver, copper

IDENTIFY THE SOLUTES AND SOLVENTS

Solute SolventOcean Water- Salt, Water Salt WaterKool-Aid- Powder, sugar, and water Powder, Sugar WaterAntifreeze- Water and ethylene glycol Ethylene

GlycolWater

Lemonade- Water, Lemon Juice, and sugar Lemon Juice,

SugarWater

Soda Pop- Syrup, water, and CO2 gas Syrup, CO2 gas WaterAir- Nitrogen, oxygen, other gases Oxygen, Other

gasesNitrogen

Gold Jewelry- gold, copper Copper GoldSterling Silver- Silver, copper Copper Silver

RATE OF DISSOLVINGBeaker Solute Solvent

TemperatureTime

1 Sugar Cube (no stir) Room2 Sugar Crystals

(no stir)Hot

3 Sugar Crystals (no stir)

Cold


Room

5 Sugar Crystals (STIR)

Room

RATE OF DISSOLVINGBeaker Solute Solvent

TemperatureTime

1 Sugar Cube (no stir) Room 21 + mins2 Sugar Crystals

(no stir)Hot 15 secs


Cold 5+ mins


Room 5+ mins

5 Sugar Crystals (STIR)

Room 45 seconds

WHAT FACTORS AFFECT THE RATE OF DISSOLVING?

• Temperature- Warmer Solvent means molecules are moving faster and more spaced out so solute mixes in faster.

• Stirring- Stirring increases Kinetic motion of molecules so solute mixes in faster.

• Particle Size (Crystals vs. Cube)- Smaller particles can fill spaces between particles faster. Larger cubes have to have many particles move from the surface before the inside particles can dissolve.• Larger Surface Area!! Faster Dissolving.

Parts of Mixture

Mass Mass of Mixture

% of Mixture

Beads 13.6 g 23.1 g 58.87%Paper Circles 1.9 g 8.22%Paper Clips 1.1 g 4.76%Barley 6.4 g 27.7%

Total = 99.55%How does the mass of the mixture compare to the mass of the parts?

Part II: Mixtures and Masses

SATURATED VS. UNSATURATED SOLUTION

•Saturated Solution- a solution that holds as much solute as it can. Maximum amount of solute has been dissolve.

Can you change saturation?

SATURATION CAN CHANGE…

• Increase the temperature of the solvent ->Increase the solubility.

EXIT SLIP 10/281. Identify 2 ways a mixture is different from a

compound.2. Identify 2 factors that increase the rate of

dissolving? Explain what happens to the molecules.

3. How does the mass of the mixture compare with the mass of the parts of the mixture?

4. Is sugar water a homogeneous or heterogeneous mixture?

5. On the back…Draw a molecule diagram of a sugar water solution. Label the solute and the solvent. Use different colors.

EXIT SLIP 10/281. Identify 2 ways a mixture is different from a

compound.2. Identify 2 factors that increase the rate of

dissolving? Explain what happens to the molecules.

3. How does the mass of the mixture compare with the mass of the parts of the mixture?

4. Is sugar water a homogeneous or heterogeneous mixture?

5. On the back…Draw a molecule diagram of a sugar water solution. Label the solute and the solvent. Use different colors.

OPEN MESSING WITH MIXTURES LAB

HOW CAN YOU SEPARATE A MIXTURE?

• What physical property helps you separate a mixture of Kool-aid powder and sand?• Solubility -> Kool-aid powder dissolves in water, but sand does not.• Then Particle Size Kool-aid will go through the filter, sand will not.

• Follow the procedure exactly! I’ll know based on the results.

• Results: Calculate the % Recovery = Total final mass x 100Total starting mass

S7- FOLDING THE FILTER

DATA TABLEMass of cup #1 and mixture

Mass of cup #2 and water

Mass of coffee filter and funnel

Total Starting Mass

Mass of cup #1 after filtering


Total Final Mass

% Recovery:

DATA TABLEMass of cup #1 and mixture

Mass of cup #2 and water

Mass of coffee filter and funnel

Total Starting Mass



Total Final Mass

% Recovery:

THE REMAINING SLIDES APPLY ONLY TO HONORS SCIENCE 7

Item Mass (g)Mass of Mixture + Cup

Mass of Cup

Mass of Mixture

Mass of Sand

Mass of Salt

Mass of Brown Rice

Mass of Iron Fillings

HS7-Data Table for Separating Mixtures Lab

SEPARATING MIXTURES LAB REPORTHONORS SCIENCE

I. Purpose (Can Copy from Messing with Mixtures LabHS7)

II. Procedure Detailed Step by Step Instructions on how you would separate the mixture. Formal Language

III. Materials List of the materials you needed and used: Edit this today.

IV. Data Table(s)Show mass of mixtures, cups, and each part of the mixture. Don’t Forget to put in Units!!

V. ResultsVI. Conclusions and Reflections

RESULTSHONORS SCIENCE

• Summarize how you separated the mixture.• Summarize the data. (Show a chart)• How close were you to the actual results for each

item?• What is your % error? (Make a chart)• % error = (Your data/ actual measurements) x 100

• What was your percent recovery. • % Recovery = (Mass of final/ mass of starting mixture) x 100

• Describe how and where you had to change your procedure.

CONCLUSIONS AND REFLECTIONSHONORS SCIENCE

• Summarize what went right and what went wrong in the experiment and with your procedure.• How would you change the procedure next time?• Would you use different tools or techniques?• What did you learn from separating this mixture?

Documents

Messing with Mixtures Lab