Acids and Alkalis

What are the properties of acids?

• Acids have a sour taste, turn blue litmus paper red, and react with metals to produce hydrogen gas.

• Acids have a bitter taste, turn blue litmus paper green, and react with metals to produce carbon dioxide gas.

• Acids have a sweet taste, turn blue litmus paper blue, and react with metals to produce oxygen gas.

• Acids have a salty taste, turn blue litmus paper yellow, and react with metals to produce nitrogen gas.

What are the properties of alkalis?

• Alkalis have a bitter taste, slippery texture, can conduct electricity when dissolved in water, can neutralize acids, and turn litmus paper blue.

• Alkalis have a sweet taste, rough texture, can conduct electricity when dissolved in water, can neutralize acids, and turn litmus paper red.

• Alkalis have a sour taste, slimy texture, cannot conduct electricity when dissolved in water, cannot neutralize acids, and turn litmus paper green.

• Alkalis have a salty taste, sticky texture, can conduct electricity when dissolved in water, cannot neutralize acids, and turn litmus paper yellow.

Which indicator is commonly used to test for acids and turns red in its presence?

• litmus paper

• pH paper

• yellow litmus paper

• blue litmus paper

Which indicator is commonly used to test for alkalis and turns blue in its presence?

• red litmus paper

• universal indicator

• litmus paper

• pH paper

What happens when an acid reacts with a metal?

• It produces carbon dioxide gas and a salt.

• It produces oxygen gas and a salt.

• It produces water and a salt.

• It produces hydrogen gas and a salt.

What happens when an acid reacts with a base?

• Formation of a salt

• Release of hydrogen gas

• Increase in acidity

• Neutralization reaction occurs

What is the pH value of a neutral substance?

• 14

• 10

• 7

• 1

What is the pH value of an acid?

• less than 7

• between 7 and 14

• equal to 7

• greater than 7

What is the pH value of an alkali?

• less than 7

• equal to 7

• negative value

• greater than 7

What is the pH value of a substance that is neither acidic nor alkaline?

• 0

• 14

• 10

• 7