Wednesday, February 16

1. Pick up 6 sheets:

• 4 pages of Solutions Notes

• 2 pages of Mixtures Lab

2. Got Lab Test and Stoich Test back

3. Started the Mixtures lab

There are 4 unknown liquids as shown below


(liquids in order left to right)

they must be observed based on:

1. how they look
2. what happens when shaken
3. whether there is an odor
4. whether a light shines through or not
5. how quickly it filters

(all 4 liquids being filtered)

6. what's left when liquid evaporates

4. Data:

1. look at picture above
2. unknown 1: stays the same, unknown 2: same, unknown 3: mixes but settles, unknown 4: same
3. none had much of an odor
4. light shined through unknowns 2 and 4 but not 1 and 3
5. 2 and 4 filtered quickly. 1 and 3 filtered slowly
6. unknown 1: white powder, unknown 2: blue residue, unknown 3: muddy paste, unknown 4: evaporated clean

5. Solution notes

I. Types of Substances:

A. Pure - can be one substance

B. Mixtures - can be more than one substance

C. Examples:

1. mixture
2. mixture
3. pure

II. Types of Mixtures:

A. Solutions

• shake - no change
• uniform
• light passes through
• everything goes through filter
• evaporate - residue

B. Suspensions

• shake - change
• settling
• light does not go through (Tyndall Effect)
• substance is filtered out
  
• evaporate - residue

C. Colloids

• shake - no change
• does not settle
• Tyndall Effect
• everything goes through filter
• evaporate - residue