Following was written in by a student:

Hi, I have a Chemistry question..

A metallic element, M, has the following properties:

• less dense than water
• soft
• melts below 100C
• occurs naturally as its chloride, formula MCl
• the oxide of M reacts with water to form a solube hydroxide

Suggest how metal M can be extracted from its compounds. Explain your reasoning.

Also, how do I distinguish between hydrogen gas and nitrogen gas?

(more…)

More questions sent in to be discussed by students:

Question:
Which gas is produced in large quantities by fractional distillation?
A. chlorine
B. ammonia
C. nitrogen
D. methane

Last question for the night. Come on..Students taking your Chemistry Paper 2 on next Wednesday. Time for you to answer this question.

Rgds,
Sean
SimpleChemConcepts
Learnig Experience with A Difference

Let’s check out this question on Energy Changes:

Question:
When solid potassium chloride is added to water, the temperature of the mixture falls. What conclusion can be made from this observation?
A. The process is endothermic.
B. The process is exothermic.
C. All solids dissolve with a fall in temperature.
D. Very little potassium chloride dissolves in water.

Anyone would like to share your answers for above Energy Changes questions?

PS: Leave your suggested answers and explanations in the “Comment” section below.

Rgds
Sean
SimpleChemConcepts
Learning Experience with A Difference