Menu Close

Is a penny an independent variable?

Is a penny an independent variable?

#1. The independent variable in this experiment was the side of the penny. #2. The dependent variable in this experiment was the number of drops on a penny.

What did you observe when you dropped water onto the coin?

Water’s cohesion and surface tension are special because of hydrogen bonds. The cohesion and surface tension of water becomes apparent when the drops of water you add to the penny reach the penny’s edge. Once the water has reached the edge, you begin to see a bubble or dome of water forming on top of the penny.

What is an independent variable in science?

Answer: An independent variable is exactly what it sounds like. It is a variable that stands alone and isn’t changed by the other variables you are trying to measure. Usually when you are looking for a relationship between two things you are trying to find out what makes the dependent variable change the way it does.

What is the independent variable in surface tension?

The independent variable is the addition of soap. This is the independent variable because the soap was added to the water, changing the composition and surface tension of the water. The dependant variable in this experiment was the numbers of drops of water that varied vastly between the water and soapy water.

Can a penny hold more drops of tap water or more drops of soapy water?

You should find that plain tap water produces a much larger, stable drop of water on top of the penny than the soapy water does. This is because plain tap water has higher surface tension, so the surface is “stronger” and can hold together a larger drop.

Which side of a penny will hold more drops of water?

heads side
The results indicate that when you drop water on a penny that the heads side of the penny will hold more drops (heads 23 drops, tails 18 drops).

Which side of a penny will hold more drops of water choose the best hypothesis?

Why do drops stay on a penny?

The cohesive force that occurs between water molecules is so strong that, at the water’s surface, it creates a “skin”, which is known as surface tension. As drops of water are added onto a penny, the adhesive force between the water and the penny keeps the water from falling off.

How many drops of water can fit on a penny independent variable?

Were you surprised to discover that a lot more drops of water fit on a penny than you predicted? We had 27 drops of water on ours!

How many drops of soapy water will fit on a penny?

11 drops
Our results were interesting. I knew that the oil should have less surface tension than the water, but we had equal results – 23 drops for each. Soapy water had the least surface tension. We were only able to get 11 drops of soapy water on the penny.

What is the independent variable for the drops on a penny?

The independent variable for the Drops on a Penny lab experiment is the type of solution used for the experiment. The independent variable is the portion of the experiment that is changed between tests.

How does the drops on a penny experiment work?

For the Drops on a Penny lab experiment, testers use an eyedropper to drop single drops of water onto a penny, and they count how many drops can fit on the surface before spilling over. The purpose of the experiment is to test the cohesion and surface tension properties of the penny and solution.

How many drops of water can you fit in a penny?

In the Drops on a Penny experiment, though, you’ll experience surface tension and cohesion at their finest. How many drops of water can you fit? There’s only one way to find out… by adding one drop at a time! SICK Science ® is a registered trademark of Steve Spangler, Inc. All Rights Reserved. Sick Science!

Why does a penny have a bubble shape?

The bubble shape is a result of the water molecules clinging to one another in an optimal shape (just like the bonds on the surface of a blown bubble). Extend this experiment by trying different coins such as dimes, nickels, or quarters. Demonstrating the cohesive properties of water is pretty cool, but it isn’t a science fair project.