Unknown Mixture Lab

Problem:

Hypothesis: If I separate and identify the unknown mixture, then .
Materials:

For separation of liquids & solids
- ______-______

-______-______

-______-______

-______-______

-______-______

For identifying liquids:

- ______-______

-______-______

-______-______

-______-______

For identifying solids:

- ______-______

-______-______

-______-______

-______-______

Procedures:

  1. Separation procedures:

______

______

______

______

______

______

  1. Identification procedures for liquids:

______

______

______

______

______

  1. Identification procedures for solids (NON-metals)

______

______

______

______

______

  1. Identification procedures for solids (METALS)

______

______

______

Data:
Table 1-

Substance / Material / Physical Characteristics / Hazards / Safety Precautions
Appearance / Density / Corrosive/ Reactive / Flammable / Toxic
Liquid A
Liquid B
Red tube
Black square
Light metal cylinder
Dark metal cylinder

Table 2-

Test / Liquid A / Liquid B
Appearance
Miscible in water
Miscible in ethanol
Contains H2O
Corrosive
Toxic
Flammable

Table 3-

Tests
Electrical conductivity
Density relative to water
Density relative to ethanol
Reacts with copper chloride

Table 4-

Name of object / Mass (g) / Volume (cm3 or mL) / Density (g/ cm3 or g/mL) / Object’s material of ID

Analysis Questions:
1. Based on Activity 5, how would you separate the following mixtures:

  1. Oil and vinegar?
  2. Salt and iron shavings?
  3. Salt and sand?

2. Based on Activity 6, what are the identities of the 2 liquids? Give 3 pieces of evidence to support each answer.

3. Now that you have identified the 2 liquids in Activity 6, what safety precautions will you take with each liquid?

4. Based on Activity 7, which solids could you identify and which ones could you not identify?

5. Why were you unable to identify some of the solids? What information do you think you need to identify the unknown solids?

6. Based on Activity 7 & 10, what are the identities of all the unknown solids? Give 3 pieces of evidence to support each unknown’s identity.

7. In all 4 activities (5, 6, 7 and 10), you performed many tests. List which tests identified:

a. the physical properties of liquids and solids. b. the chemical properties of liquids and solids.

8. Create a density bar graph of all the substances found in the mixture. Remember: title, units, x and y labels.

9. Now that you know the identity of the unknown mixture, create a label for the container. Make sure to include:
- the identities of ALL the liquids and solids
- any safety hazards (use DOT hazardous labels from Activity 2)
- any safety precautions you must take when using/touching the mixture

Conclusion: (follow RERUNS format)