Tuition Singapore Secondary Science Chemistry Tuition – Elements, Compounds and Mixtures

Question 1

Which of the following sets contains only elements?
A. Hydrogen, brass and oxygen
B. Alcohol, sodium and seawater
C. Air, neon and oxygen
D. Mercury, carbon and neon

Question 2

Which of the following elements is the most abundant in air?
A. Oxygen
B. Nitrogen
C. Carbon dioxide
D. Argon

Question 3

Which of the following substances is not a compound?
A. Salt
B. Carbon monoxide
C. Helium gas
D. Steam

Answers:

Q1) D – All the elements can be found in the Periodic Table.

Q2) B – The percentage of nitrogen in air is 80 %.

Q3) C –  Helium is an element

Please contact Mr Ong @ 9863 9633 or Angie @ 96790479 if you need help in Secondary Science Chemistry Tuition