Question

Assignment 1
Chemistry Lesson 1
1.Write the chemical equations for the following:
a) Zinc reacts with sulphuric acid .
b) Potassium iodide reacts with lead nitrate.
c ) magnesium reacts with oxygen.
2. Give reason why magnesium wire is rubbed before burning on the flame.
3. Give one example of the following types of changes.
a) change of state takes place
b) change of color takes place.
c) gas is evolved.
4. Draw and label the diagram to show the burning of magnesium wire​

Answer 1

Answer:

1. a. Zinc + sulphuric acid ——→ zinc sulphate + hydrogen.

b. Pb(NO3)2+2KI...Pb(NO3)2+2KI

c. 2Mg + O2 → 2MgO

2. Magnesium ribbon must be cleaned before burning in air so that the the layer of magnesium oxide (which is formed due to reaction of magnesium with air) can be removed in order to get the desired chemical reaction.

3.a.Mg+O2.....MgO

b.Pb(NO3)2+2kl....2KNO3+Pbl2

Pb(NO3)2 is colorless.. Pbl2...yellow color...

c.Zn+H2SO4...ZnSO4+H2is evolved..

4. image I have sent..from my science book

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