Indicators

What is an indicator?

• A substance that changes colour in acid or alkali.

• A substance that produces hydrogen gas when reacted with acids.

• A substance that is neutral.

• A substance that is always red in colour.

An indicator will ______________ when it is in contact with an acid or base

• Bubble
• Form a new substance
• Change color
• Stay the same color

Examine the results (color change) of the pH paper shown in the picture. What type of substance was tested?

• an acid

• an alkali

• a neutral substance

• none of the above

Tags

NGSS.MS-PS1-2

The pH scale tells how acidic or basic a substance is. The scale goes from _____ to _______

• 1-10

• 0-14

• 1-14

• 1-100

When the cabbage juice indicator comes into contact with acid, the colour changes from_____________________.

When the cabbage juice indicator comes into contact with alkali, it changes colour from___________________.

What is a substance that is one color in an acid and another color in a base? 

• Oxidizer
• Indicator

The pH of a strong base would be:

• 1-2
• 5-6
• 8-9
• 13-14

The pH of a strong acid would be:

• 1-2
• 5-6
• 8-9
• 12-13

The pH of a weak acid would be:

• 1-2
• 5-6
• 8-9
• 12-13