The video tutorial guides viewers through creating a simple electrolysis device using stainless steel screws, rubber bands, and a 9-volt battery. It explains how to prepare a salt solution with Epsom salts and a homemade pH indicator using cabbage juice. The device is tested in the solution, showing bubble formation at the terminals. Further exploration with the pH indicator reveals color changes, indicating chemical reactions at the electrodes.

Which of the following is NOT a material needed to make the electrolysis device?

• 9-volt battery

• Copper wire

• Stainless steel screws

• Rubber bands

Tags

NGSS.MS-ETS1-1

What is the purpose of the rubber bands in the electrolysis device?

• To insulate the device

• To hold the stainless steel screws in place

• To connect the battery terminals

• To act as a conductor

How should the rubber bands be positioned on the battery?

• Around the sides of the battery

• Only across the positive terminal

• Only across the negative terminal

• Across both terminals forming a cross

What is the main component of the salt solution used to test the device?

• Vinegar

• Baking soda

• Epsom salts

• Table salt

Why is it useful to have a pH indicator when exploring the electrolysis process?

• To observe the color change in the solution

• To check the conductivity of the solution

• To determine the acidity or basicity of the solution

• To measure the temperature of the solution

What is the preferred natural source for making a pH indicator in this tutorial?

• Red or purple cabbage

• Beetroot

• Spinach

• Carrots

What observation is made when the electrolysis device is placed in the salt solution?

• No bubbles are formed

• Bubbles form equally on both sides

• The solution changes color immediately

• One side bubbles more than the other

Tags

NGSS.MS-PS1-2

Which terminal of the battery generates more bubbles during the electrolysis process?

• Negative terminal

• Both terminals equally

• Neither terminal

• Positive terminal

What additional observation is made when a pH indicator is added to the solution?

• The solution heats up

• The solution becomes clear

• Colors form around each terminal

• The solution evaporates

Tags

NGSS.MS-PS1-2

What color forms around the negative terminal when the pH indicator is used?

• Yellow

• Greenish bluish

• Pinkish

• Red

Tags

NGSS.MS-PS1-2