Q1 Zinc nitrate reacts with aqueous ammonia (NH4OH) to form a salt and a base.

(ii) Describe the observations for the reaction

When zinc nitrate solution reacts with ammonium hydroxide (both colourless), a white precipitate of zinc hydroxide is will be produced .

Q1 Zinc nitrate reacts with aqueous ammonia (NH4OH) to form a salt and a base

(i) Name the salt and the base.

Salt is ammonium nitrate. Base is zinc hydroxide.

Comment 3

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5. Sodium is a metal and sulfur is a non-metal....why we classify them this way??

http://www.elementsdatabase.com/Images/periodic_table.gif






http://www.chemglobe.org/ptoe/periodic.png



Sulfur is a non-metal because:

1. it does not conduct electricity

2. it will gain electrons to complete the valence shell

3. it lies on top of the stair case on the table


Sodium is a metal because:

1. it conducts electricity

2. it will lose electron to complete the valence shell

3. it lies below the staircase (group1 )

4. Chlorine-35 atom and Chlorine-37 atom are called isotopes...Use these two examples to explain what is 'isotopes'.

Isotopes are atoms of the same element that have different nucleon number (mass no.) or different number of neutrons.
Isotopes  of the same element have similar chemical properties but different physical properties.

Since Chlorine-35 and Chlorine-37 have the same number of proton and  electron but different number of neutron, they are called isotopes of chlorine. Thus, the average nucleon number of chlorine will be  [(75/100) x35 ] + [(25/100) x37] =  35.5

Chlorine Atoms	No. of Proton	No. of Electron	No. of Neutron
Chlorine-35	17	17	18
Chlorine-37	17	17	20

http://alexteoh.com/Atomic%20Structure_files/image003.jpg


http://www.wordwizz.com/images/isotopes.gif