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Answers
1.
The type of chemical reaction in which two or more reactants combine together to give a single product is called a combination reaction.Ex.
4H + O2 -----2H2O
2.
COMBUSTION
C + O2 ----- CO2
3.
The reactants of this chemical reaction are iron, water, and oxygen, and the product is hydrated iron oxide, better known as rust
4.
When fresh fruits and vegetables are peeled or cut open, the enzyme called polyphenol oxidase (also called tyrosinase) contained in the cells is exposed to and reacts with the oxygen in the air. The reaction that occurs, which is called oxidation, is what turns the fruits and vegetables brown.
5.
Potassium (K) and Sodium (Na)
6.
Magnesium (Mg)
7.
Magnesium and oxygen are the reactants and Magnesium oxide is the product.
2Mg +O2 ---- 2MgO
8.
Here are some ways where we can prevent rusting :
1. Paint it - Paint the metal with any durable acrylic paint. Do not use Water-Soluable paints, since they will only worsen the rust. Rust will form underneath this type of paint.
2. Keep moisture at Bay - Avoid contact with water or moisture. We know that the water has chemical formula which corresponds to 2 parts Hydrogen and 1 part Oxygen. Hence oxygen is responsible for oxidation of iron and therefore forms rust.
3. Coat it with Oil - Use of oil or grease significantly reduces the chances of developing rust in iron. Basically, oil or grease form a protective layer over iron just as paint does and therefore prevent rust formation.
Que.1
Ans: The type of reaction in which two or more substances combine to form the new substance is called combination reaction.
Que2
Ans: Formation of Water (H2O).
Que3
Ans: Reactants in the process: Iron .Water and Oxygen.
Products in the process: Hydrated iron oxide also known as RUST.
Que4
Ans: This is due to because that the cells of the cut fruits and vegetables contain an enzyme tyrosinase. It reacts with the air present in the atmosphere and the colour of the fruits and vegetables changes.
Que5
Ans: Sodium and potassium are the metals that react vigorously with the oxygen.
Que6
Ans: Magnesium.
Que7
Ans: Reactants in the process : Magnesium and oxygen.
Products in the process: Magnesium oxide.
Que 8
Ans: We protect rusting from the process of galvanisation, electroplating, by applying paints, by applying grease.