Acids and bases

Which pH represents a weak acid ?

• 1.7

• 4.6

• 8.9

• 13.1

Which pH represents a strong alkali ?

• 2.1

• 6.2

• 10.2

• 12.9

Which of these chemicals is an alkali

• sulfuric acid

• magnesium oxide

• sodium hydroxide

• methane

What is the difference between an alkali and a base ?

• only alkalis neutralise acids

• alkalis are soluble bases

• bases are insoluble alkalis

• bases have a pH below 7 but alkalis are above 7

Which is not a similarity between alkalis and bases.

• they are both soluble in water

• they both neutralise acids

• they both react with acids to make a salt and water

• they can be oxides or hydroxides of metals

Tags

NGSS.HS-PS1-1

What salt is made when zinc oxide reacts with nitric acid

• zinc hydroxide

• zinc acid

• zinc nitrate

• nitric zincate

If a substance produces hydrogen ions (H⁺) in aqueous solution, what is it ?

• an acid

• an alkali

• a salt

• water

If a substance produces hydroxide ions (OH^-) in aqueous solution, what is it ?

• a base

• an acid

• a salt

• an alkali

Copper oxide is an insoluble black powder that reacts with sulfuric acid.

what type of substance is it ?

• an alkali

• an acid

• a base

• a salt

Tags

NGSS.HS-PS1-1

Which of these substances will neutralise hydrochloric acid ?

tick ALL that apply

• copper oxide

• copper hydroxide

• copper carbonate

• copper chloride