📚 Part 1: Multiple Choice

1. Which separation technique would be BEST for separating sand from saltwater?

Evaporation only

Filtration followed by evaporation

Centrifugation only

Chromatography

2. Decanting works best when the components of a mixture have:

Different colors

Different densities

Different temperatures

Same particle size

3. Which separation techniques rely primarily on particle size differences? (Check all that apply)

Filtration

Evaporation

Centrifugation

Chromatography

4. If oil has a density of 0.8 g/mL and water has a density of 1.0 g/mL, what will happen when they are mixed?

Oil will sink to the bottom

Oil will float on top

They will mix completely

Water will evaporate first

🧮 Part 2: Density Calculations

5. Calculate the density of each substance. Show your work using the formula: Density = Mass ÷ Volume

Substance A: Mass = 45.6 g, Volume = 12.0 mL

Density = __________ g/mL

Substance B: Mass = 28.4 g, Volume = 8.5 mL

Density = __________ g/mL

6. Based on your calculations above, which substance (A or B) would float on water? Explain your reasoning.

🔬 Part 3: Separation Design Challenge

7. You have been given a mixture containing the following components:

• Iron filings (magnetic, insoluble in water)

• Sand (non-magnetic, insoluble in water, density = 2.6 g/mL)

• Salt (soluble in water)

• Vegetable oil (insoluble in water, density = 0.9 g/mL)

Design a step-by-step separation procedure to isolate each component. List the techniques you would use and explain why each step would work:

Step 1: ________________________________________________

Reason: _______________________________________________

Step 2: ________________________________________________

Reason: _______________________________________________

Step 3: ________________________________________________

Reason: _______________________________________________

Step 4: ________________________________________________

Reason: _______________________________________________

8. Reflection: How does understanding density help scientists choose the most effective separation method for a mixture? Give at least two specific examples.

Separation Techniques & Density

Separation Techniques & Density

📚 Part 1: Multiple Choice

🧮 Part 2: Density Calculations

🔬 Part 3: Separation Design Challenge

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