Question

Chapter-1
Chemical reaction and Equations

1. What are the observation that help us to determine whether a chemical reaction has taken place or not?

2. Write the word equation for the reaction taking place between Magnesium and Oxygen.

3. Balance the following chemical equations:
(a) Fe+H2O -----> Fe3O4 + H2↑
(b) CO(g) + H2(g) -----> CH3OH(I)
(c) CO3(aq) + H2O(l)---›C6H12O6+O2(g)↑

4. What are the visible changes taking place when an iron nail is dropped in an aqueous solution of CuSO4?

5. Complete and Balance
(a) ZnO+C----∆---->
(b) MnO2+HCI ------>
(C) Na2SO4+ BaCl2----->
(d) AgBr(s)---Sunlight--->
(e) Pb(NO3)2(s)--HEAT--->
(f) CH4(g)+O2(g)--------->
(g) CaO (s)+H2O(l)-------->
(h) Zn+H2SO4---->
(i) Mg+02------->
(j) AgCl (s) -----Sunlight----->

6. What happens when:-

a) Aqueous solution of Potassium iodide is added to an aqueous solution of Lead nitrate.
b) Ferrous sulphate crystals are heated first gently and then strongly.
c) CO2 gas is passed through lime water.
(1) first a little
(ii) and then in excess
Heal.​

Answer 1

Answer:

1. There are several observations that can be made to determine if a chemical reaction has occurred. The first is a change in temperature. Heat can be absorbed (endothermic reaction) or released (exothermic reaction) which results in a temperature change.

2. Word Equation : magnesium + oxygen

== magnesium oxide

Skeleton Equation : Mg + O2 == MgO

Balanced Equation : 2 Mg + O2 == 2 MgO

Answer 2

Holaaa Mate

Answer:

Refer to the attachment.