Acids and Alkalis Assessment

What is the primary characteristic of an acid when it dissolves in water?

• Increases hydroxide anions

• Increases hydrogen cations

• Decreases hydrogen cations

• Remains neutral in solution

Which of the following is NOT an example of an alkaline substance mentioned in the lesson?

• Baking soda

• Toothpaste

• Lemon juice

• Detergents

How can you distinguish between an acid and an alkali using litmus paper?

• Acids turn both strips green

• Alkalis turn both strips yellow

• Acids turn blue litmus red, alkalis turn red litmus blue

• Both substances have no effect on litmus paper

Which of these is classified as a strong acid?

• Vinegar

• Nitrous acid

• Sulphuric acid

• Sulphurous acid

What products are formed when an acid reacts with an alkali?

• Two different salts

• Salt and hydrogen

• Salt and water

• Water and oxygen

Why is sodium hydroxide considered a stronger electrical conductor than ammonium hydroxide?

• It has more hydrogen ions

• It is a strong alkali

• It dissolves faster in water

• It has more sodium atoms

What is the medical application of magnesium hydroxide mentioned in the lesson?

• Treating throat infections

• Cleaning wounds

• Neutralizing stomach acid

• Reducing fever

What type of ion is OH-?

• Cation

• Anion

• Neutral ion

• Hydrogen ion