Science: Investigating Bubbles: Surface Tension and Shapes Worksheet

Question 1

A bubble is made from soap, water, and air. What is inside a bubble?

Accepted Answer

Air is inside a bubble. The soap and water make a thin film around the air.

Question 2

Surface tension helps the surface of water act a little like a stretchy skin. How does soap help when you blow bubbles?

Accepted Answer

Soap helps the water stretch into a thin film. This makes it easier for a bubble to form and last longer.

Question 3

When a bubble floats in the air, it usually looks round like a sphere. Explain why a bubble is usually round.

Accepted Answer

A bubble is usually round because the soap film pulls evenly in all directions. A round shape uses the least surface for the air inside.

Question 4

Mia blows a bubble through a square bubble wand. What shape will the bubble most likely be after it leaves the wand?

Accepted Answer

The bubble will most likely become round. Even if the wand is square, the bubble film pulls into a sphere after it leaves the wand.

Question 5

You touch a bubble with a dry finger, and it pops. Why might the bubble pop?

Accepted Answer

The dry finger can break the thin soap film. When the film breaks, the air escapes and the bubble pops.

Question 6

A student touches a bubble with a finger dipped in bubble solution. The bubble does not pop right away. Why might the wet finger help?

Accepted Answer

The wet finger has bubble solution on it, so it is less likely to break the soap film. The bubble can stretch around the wet finger for a short time.

Question 7

Look at these observations: Bubble A lasted 2 seconds. Bubble B lasted 8 seconds. Bubble C lasted 5 seconds. Which bubble lasted the longest?

Accepted Answer

Bubble B lasted the longest because it stayed for 8 seconds, which is more than 2 seconds or 5 seconds.

Question 8

In an investigation, one group blows bubbles inside near a fan. Another group blows bubbles inside with no fan. Which setup is more likely to let bubbles last longer, and why?

Accepted Answer

The setup with no fan is more likely to let bubbles last longer. Moving air from the fan can push and break the bubbles faster.

Question 9

Draw or describe what happens when two bubbles touch each other gently. What shape can you see where they meet?

Accepted Answer

When two bubbles touch, they can share a flat wall between them. The outside parts of the bubbles still look curved.

Question 10

Why is it important to keep only one thing different during a bubble experiment, such as changing only the amount of soap?

Accepted Answer

It is important to change only one thing so the test is fair. Then you can tell if the amount of soap caused the bubbles to change.

Science: Investigating Bubbles: Surface Tension and Shapes

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