Fill in each blank with the correct word from the lesson.

1. The sourness in lemon juice comes from _______.
2. Acids react with metals like zinc and iron to produce _______ gas, which burns with a pop.
3. All _______ share a characteristic sour taste — though you should never taste unknown laboratory chemicals to identify them.
4. Vinegar contains acetic _______.
5. Acids in Daily Life is an important topic in _______.

Choose the best option for each question.

1. What happens to blue litmus paper in an acid?
   a) It stays blueb) It turns redc) It turns greend) It dissolves
2. Which acid is found in lemon juice?
   a) Acetic acidb) Hydrochloric acidc) Citric acidd) Sulphuric acid
3. What gas is produced when an acid reacts with a metal?
   a) Oxygenb) Carbon dioxidec) Nitrogend) Hydrogen

Write T for True or F for False in the brackets.

1. It turns red is one of the key concepts in the lesson on Acids in Daily Life.
2. It stays blue is the main topic of this lesson.
3. The sourness in lemon juice comes from citric acid.
4. The sourness in lemon juice comes from Acetic acid.

1. In your own words, explain what Acids in Daily Life means.
2. List two things you learned from this lesson on Acids in Daily Life.