Tag Archive: Elements Compounds & Mixtures

O Level Chemistry – Mini Series on Tough MCQs Part 2

Continue with Chemistry Tips

From the previous post, we have started on our Mini Series on Tough MCQs.

Purpose is to enquire that students are exposed to tougher & tricky chemistry Multiple Choice Questions (Paper 1) that we have observed for the last 10 years.

How come i know them, you may asked? Cos i have been compiling and analyzing these questions for my students year-after-year, and sharing with them to ensure that they know how to avoid the common mistakes and traps that many other students have fallen into.

You know what – Usually this “tough” questions are Application Type Questions that just need a cool head and good chemistry concepts to get it right. It isnt that tough at all.

Let’s continue with more questions below:

Question 1:
Why is Sodium classified as Metal?
a) It is a pure substance
b) It is a good conductor of electricity
c) It exists as atoms, not molecules
d) It is very soft

Question 2:
Buckminsterfullerene was discovered in 1985 and it has a perfect sphere with formula C60. From this information, what can you deduce about it?
a) It contains only one element
b) It is a compound of 60 elements
c) It is a mixture of 60 atoms
d) It is a mixture of 60 elements

Question 3:
When mercury is heated, it forms mercury and oxygen,

Mercury oxide (s) –> mercury (l) + oxygen (g)

What can you deduce from the above information?
a) During the heating of mercury oxide, all three states of matter exist
b) Mercury oxide is a mixture
c) Mercury oxide is a silver solid
d) The composition of mercury oxide varies during heating

PS: Try out the questions and enter your suggested answers (and comments) right below, so that others can come in to share their answers and thought process.

O Level Chemistry: Element, Compounds & Mixtures

Another question on Elements, Compounds & Mixtures that i have discussed with the students in my Intensive Revision Program. Thought it will be an interesting one for you to try it out.

Question:
The elements iron and sulfur combine to form the compound iron sulfide (FeS). List the differences between Iron Sulfide and a mixture of iron and sulfur. (Tips: You can present in a table format)

All the best to your Academic Success in Chemistry,
Sean

PS: Check “Comments” below for Suggested Answers.

O Level Chemistry: Element, Compounds & Mixtures

Q) Explain why air is considered a mixture & not a compound or element?

Do show us your reasoning as much as possible.

Sean

PS: Check “Comments” below for Suggested Answers.