CHEM VI TESTLET

CHEMISTRY TESTLET
Name………………………………………………………………………….
State 3 uses of Nitrogen.



a) What do you understand by the term cracking in organic chemistry?
a) Mention two types of cracking



With the acid of a balanced equation describe what happens when concentrated sulphuric acid is added to copper (ii) sulphate crystals and sucrose
a) Copper (ii) sulphate

Observations; CuSO4,

Equation; Sucrose

Observations;

Equation;
From an experiment 20.0cm3 of hydrochloric acid required 25cm3 of 0.1M Na2CO3 solutions for complete reaction. Calculate the Molarity of the acid and its concentration in grams per liter.
i) Concentration in grams per liter



ii) Molarity of the acid



Explain why Magnesium continues to burn in Carbon (iv) Oxide. (Use equation)


What do you understand by the phrase ‘cloud seeding’



On heating 12.5g of a hydrated copper (ii) sulphate CuSO4.nH2O 8.0g of anhydrous copper (ii) sulphate remained. Find the formula of the hydrated salt.









Gas x was found to decolorize moist litmus paper but had no effect on dm litmus paper. A colorless solution of potassium bromide turned reddish-brown when the gas was bubbled through it.
a) Name gas x

b) State all the observations made when moist litmus paper is brought into contact with gas x



C (i) why did the colorless potassium bromide solution turn reddish-brown?


(ii) Write an equation for the reaction in c I above


(iii) From the equation in (ii) above state which of this reactant is
1. An oxidizing agent

2. A reducing agent

State four differences between carbon (iv) oxide and carbon (i) oxide.
Carbon (iv) oxide
Carbon (II) oxide












A white substance x when heated gave off carbon (IV). The residue was orange when hot, yellow when cold what was the substance x?



Use Graham’s law to calculate the relative rate of diffusion of ammonia and oxygen.
(H=1 N=14 O=16)
Ans 1.37.