Purpose: Experiment to Discover some of water's unique properties. Materials: beaker of WATER! Bag of pennies eye droppers for each person in the group 2-Plastic Cup wax paper Plastic tray EMPTY PETRI DISH Test Tube Pennics #1 1. Question: How many pennies can be put in a jar FULL of water before water will spill over the edge? 12 2. Procedure: a. Using the beaker of water, fill a plastic cup with water as close to the top as possible. You may need to bend down so that your eyes are level with the top of the plastic cup. Use the plastic pipet to add a drop by drop until you are sure the cup is ALL the way full. b. GENTLY Add pennies one by one until water trickles over the edge. Count the pennies and repeat for a total of 3 times. c. d. After you have done it three times, repeat it once more but this time add a half a squirt of liquid soap to the water before adding the pennies. 3. Data: number of pennies in plastic cup number of pennies in plastic cup with soap uestions at the end of this lab ennies #2 Question: How many drops of water will fit on the head of a penny? 2.Procedure: a. Make sure the water you are about to use is not soapy AT ALL! b. Be sure each person's penny is dry. b.Using a, plastic pipet each person in the group will count the number of drops of water that will fit on the head own penny before spilling off. Don't bump the table! 3. Data: record each persons number: __ Question: What will soap do to pepper floating on the surface of water? Procedure: ocedu MAKE SURE ALL SOAP IS WASHED OUT FIRST!Put some water in the petri dish. (The amount doe b. Sprinkle a pinch of pepper on top of the water. b.Put a small amount of soap on the tip of your finger and touch the surface of the water. Data: Record your observations below. per and Soap

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Purpose: Experiment to Discover some of water's unique properties. Materials: beaker of WATER! Bag of pennies eye droppers for each person in the group 2-Plastic Cup wax paper Plastic tray EMPTY PETRI DISH Test Tube Pennics #1 1. Question: How many pennies can be put in a jar FULL of water before water will spill over the edge? 12 2. Procedure: a. Using the beaker of water, fill a plastic cup with water as close to the top as possible. You may need to bend down so that your eyes are level with the top of the plastic cup. Use the plastic pipet to add a drop by drop until you are sure the cup is ALL the way full. b. GENTLY Add pennies one by one until water trickles over the edge. Count the pennies and repeat for a total of 3 times. c. d. After you have done it three times, repeat it once more but this time add a half a squirt of liquid soap to the water before adding the pennies. 3. Data: number of pennies in plastic cup number of pennies in plastic cup with soap uestions at the end of this lab ennies #2 Question: How many drops of water will fit on the head of a penny? 2.Procedure: a. Make sure the water you are about to use is not soapy AT ALL! b. Be sure each person's penny is dry. b.Using a, plastic pipet each person in the group will count the number of drops of water that will fit on the head own penny before spilling off. Don't bump the table! 3. Data: record each persons number: __ Question: What will soap do to pepper floating on the surface of water? Procedure: ocedu MAKE SURE ALL SOAP IS WASHED OUT FIRST!Put some water in the petri dish. (The amount doe b. Sprinkle a pinch of pepper on top of the water. b.Put a small amount of soap on the tip of your finger and touch the surface of the water. Data: Record your observations below. per and Soap

Answer 1

### The number of pennies and drops of water will vary based on surface tension. Soap reduces surface tension, causing water to spill with fewer pennies and drops. Soap also causes pepper to scatter due to the reduction in surface tension.

Answer 2

## Step 1: Understanding surface tension### Surface tension allows water to hold more pennies than expected due to cohesive forces between water molecules.## Step 2: Experiment setup### Fill a plastic cup with water to the brim, then add pennies one by one until water spills over.## Step 3: Counting pennies### Count the number of pennies added before water spills over. Repeat three times for consistency.## Step 4: Effect of soap on surface tension### Add soap to the water and repeat the experiment to observe the effect on surface tension.## Step 5: Drops on a penny### Count the number of water drops that fit on a dry penny head before spilling over.## Step 6: Effect of soap on pepper### Observe the reaction of pepper floating on water when soap is added.

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