Question

Please tell me the answer of these questions according to class 7

Answer 1

Answer:

HLO MATE

Explanation:

1. A substance composed of single type of atom is known as element.

   It cannot be broken down into simpler substances.

2. IRON- Fe

    CHLORINE- Cl

3.(a) Al₂o₃

  (b): C4H6O4Zn• 2H2O

4. Ca (OH) ₂ + 2HCl → CaCl₂ + 2H ₂ O

5.Chemical reaction is a symbolic representation of all of the substances       involved in a chemical reaction.

6.In a chemical reaction, the substances which combine together to give new substances are called Reactants and the new substances are called products.

The elements or substances to the left on the arrow in the reaction are reactants and that to the right are products.

7. C+O₂ → CO₂

PLS MARK AS BRAINLIST ANSWER.