Acids , bases and salts

When the pH scale goes lower than 7, it means that the substance is ______.

• neutral

• acidic

• basic

• salt

Which concept is correct?

• Arrhenius stated that acids are hydrogen ion donors

• Lewis stated that acids accept negatively charged ion acceptors

• Bronsted-Lowry stated that bases accepts Hydrogen ions

• All of the statements are correct

A pH scale of 0 _____ to people when exposed without protection

• is beneficial

• is dangerous

• has no effect

• medicinal value

This citrus fruit commonly consumed at home has a ph level of _____.

• below 7

• 7

• above 7

• 0

When an indicator (litmus paper ) is dipped in these liquids , there will be a change from ____

• blue to red

• red to pink

• pink to purple

• pink to yellow

If you put too much lemon in your glass and it is too sour , how will you control the taste ?

• add more lemon juice

• add more water

• add salt

• all of these

The type of acid in these products is _____

• sulfuric acid

• lactic acid

• sulfuric acid

• acetic acid

Acid rain is a phenomenon and it is caused by ____.

• the air in the atmosphere

• pollutants that reacts with the air

• meteorites falling on Earth

• weather conditions

Which statement is incorrect with water?

• It is composed of hydrogen and oxygen molecules.

• it has a neutral ph of 7.

• It reacts with base to form salt

• Water with minerals is a solution.

Stomach produces acidity to ______ digestion of food.

• delay

• facilitate and help

• stop the total