PHS Edexcel CC8 - Acids and Alkalis

Which of the following word pairs correctly completes the sentence below?
_______ are corrosive substances characterized as having a strong smell, a sour taste, and a _______.

• Acids; pH less than 7
• Acids; pH greater than 7
• Bases; pH greater than 7
• Bases; pH less than 7

Tags

CCSS.RI.9-10.4

CCSS.RI.9-10.4

CCSS.RI.11-12.4

CCSS.RI.7.4

CCSS.RI.8.4

Holly has an unknown substance in a beaker. She wants to determine the relative pH of the unknown substance. She places a piece of blue litmus paper into the substance, and the litmus paper stays blue.
The substance in the beaker

• is a base.
• has a neutral pH.
  
• is an acid.
• does not have a pH.

Turns blue litmus paper red

• acid
• base
• neither
• both

Creates a colorless solution with phenolphthalein

• acid
• base
• neither
• both

Creates a red solution with methyl orange

• acid
• base
• neither
• both

Which of the following substances contain acid?

• An orange
• Bleach
• Distilled water
• Washing powder

Which of the following substances contain an alkali?

• Baking powder
• Coca cola
• Distilled water
• Vinegar

alkalis have a ph ..

• above 7
• below 7

A substance that turns blue litmus red is

• an acid
• an alkali
• neutral
• water

Example of a Strong Acid

• Lactic acid

• Citric acid

• Ethanoic acid

• Hydrochloric acid