Question 1:
(a) Complete the following equation.
(b) If sulphuric acid and sodium hydroxide solution are added together, what would be the product?
Write down your answer in a word equation.
Answer:
(a) Acid + Alkali ➝ Salt + Water
(b) Sulphuric acid + Sodium hydroxide ➝ Sodium sulphate + Water
(a) Complete the following equation.
(b) If sulphuric acid and sodium hydroxide solution are added together, what would be the product?
Write down your answer in a word equation.
Answer:
(a) Acid + Alkali ➝ Salt + Water
(b) Sulphuric acid + Sodium hydroxide ➝ Sodium sulphate + Water
Question 2:
Explain how toothpaste works in cleaning teeth and preventing dental caries.
Answer:
The reaction of bacteria and the food residue on the tooth produces acid that corrodes the tooth and causes dental caries. Toothpaste which is alkaline can neutralise this acid and prevent dental caries.
Explain how toothpaste works in cleaning teeth and preventing dental caries.
Answer:
The reaction of bacteria and the food residue on the tooth produces acid that corrodes the tooth and causes dental caries. Toothpaste which is alkaline can neutralise this acid and prevent dental caries.
Question 3:
Is hair conditioner important? Explain your answer.
Answer:
Yes. Hair conditioner which is acidic can neutralise the residue of shampoo on hair which is alkaline. This makes the hair look soft and shiny.
Is hair conditioner important? Explain your answer.
Answer:
Yes. Hair conditioner which is acidic can neutralise the residue of shampoo on hair which is alkaline. This makes the hair look soft and shiny.