Question 25 ?

View previous topic View next topic Go down

Question 25 ?

Post by Nurul Alwani on Thu Sep 02, 2010 8:30 am

i pick D for my answer but i dont get it right .
anyone ? how to know the salt name ? confused

Nurul Alwani

Posts : 2
Join date : 2010-09-02
Age : 24

View user profile

Back to top Go down

alwani

Post by airinah aziz on Thu Sep 02, 2010 8:32 am

we share the same problem.
avatar
airinah aziz

Posts : 3
Join date : 2010-09-02
Age : 24
Location : seremban

View user profile

Back to top Go down

Guide ofr Q25

Post by Admin on Thu Sep 02, 2010 8:35 am

Based on the colour of residue.

The residue is yellow when hot & white when cold.

It is the characteristics of zinc oxide

R must be zinc carbonate/zinc nitrate.

lead carbonate when is heated decomposed produce lead oxide & carbon dioxide

lead nitrate when is heated decomposed produce lead oxide, nitrogen dioxide & oxygen gas.


lead oxide is brown when hot & yellow when cold.

Admin
Admin

Posts : 28
Join date : 2010-08-06

View user profile http://http//www.chem2u.blogspot.com

Back to top Go down

Re: Question 25 ?

Post by Sponsored content


Sponsored content


Back to top Go down

View previous topic View next topic Back to top

- Similar topics

 
Permissions in this forum:
You cannot reply to topics in this forum