Question

1. Define Physical and chemical changes, Galvanization and Crystallization.

2. Given example of physical changes.

3. How can the salts be prepared?

4. Write the properties of salts and acids.


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Answer 1

Answer:

1)Galvanization (or galvanisation) is the process of applying a protective zinc coating to steel or iron, in order to prevent rusting. Crystallization is the (natural or artificial) process of formation of solid crystals precipitating from a solution, melt or more rarely deposited directly from a gas.

2)Examples of physical change include changes in the size or shape of matter. Changes of state—for example, from solid to liquid or from liquid to gas—are also physical changes. Some of the processes that cause physical changes include cutting, bending, dissolving, freezing, boiling, and melting.

3)Salts are prepared by reacting an acid with a metal or a base, such as a metal carbonate, hydroxide or oxide. The acid provides the non-metal ion for the salt, e.g. chloride or sulphate or nitrate ions. The metal or base provides the metal ion for the salt, e.g. sodium or copper.

4)Acids, bases and salts affect chemistry as well as our day to day life. They can be easily identified by their taste; that is acids taste sour and bases taste bitter and salts itself have salty taste. All acids when react with metals generate hydrogen gas. ...

Explanation:

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Answer 2

Answer:

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Physical Change: Physical changes only change the appearance of a substance, not its chemical composition.

Chemical Change: Chemical changes cause a substance to change into an entirely substance with a new chemical formula.

Galvanization: Depositing a layer of zinc or chromium on iron to prevent it from rusting is known as galvanization.

Crystallisation: Some substances can be obtained in pure state from their solutions by the process of crystallisation.

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Examples Of Physical Change:-

1. Crushing a can

2. Melting an ice cube

3. Boiling water

4. Mixing sand and water

5. Breaking a glass

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Salts which are neutral substances can be prepared from the following methods:

1. Neutralization Reaction – It is the reaction between an acid and a base to produce salt, water and heat.

2. Reaction of metals with acids - Metals react with acids to replace hydrogen from the acids, thereby producing salts and liberating hydrogen gas.

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$\small\bold\color{green}{About}$$\small\bold\color{green}{Acids}$

1. Acids are sour to taste.

2. Acids turns blue Litmus to red.

3. Acids can corrode metals like aluminium and iron due to their corrosive nature. That is why acids are stored in glass containers and not in metal containers.

4. Acids are soluble in water.

$\small\bold\color{green}{About}$$\small\bold\color{green}{Salts}$

1. Most of the salts are soluble in water.

2. Solution of salts in water act as good conductor of electricity.

3. Some salts are white crystal whereas some are colored. For example, copper sulphate is blue in color and ferrous sulphate is green.