D. Short answer questions
1. Distinguish between an acidic salt and a basic salt.
2. Why is acetic acid used as a preservative?
3. Differentiate between a compound and a mixture. Give or
4. Why do iron objects turn reddish-brown?
5. What is the primary mode of heat transfer in liquids?
questions
Answers
Explanation:
1)A basic salt contains the conjugate base of a weak acid. ... An acidic salt containg the conjugate acid of a weak base. So ammonium ion is the conjugate acid of the weak base ammonia. So, ammonium chloride would be an acidic salt.
2)However, new research shows that a small amount of acetic acid does not have the intended effect, but rather the opposite -- it increases the amount of toxin from the harmful bacteria in the food. ... A common preservative is acetic acid, which is used to stop bacterial growth in dressings, sauces, cheese and pickles.
3)Mixtures are the impure substances, made up of two or more physically mixed substances and not in the fixed ratio. Compounds are the pure form, made up of two or more chemically mixed elements and in a fixed ratio. ... Mixtures do not have meting or boiling point, but compounds have fixed melting and boiling point.
4)When an iron object is left in damp air for a considerable time, it gets covered with a reddish- brown flaky substance called rust. This is called rusting of iron. The process of rusting is represented as follows: Rusting of iron is a chemical change because a new substance iron oxide is formed.
5)Convection is usually the dominant form of heat transfer in liquids and gases.