Science Express

13/05/2026

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01/01/2023

Happy New Year!

We wish you a wonderful new year and hope it brings you many blessings.
Get rid of the old to make place for the new, and we wish you happiness throughout the year! Best wishes for the New Year!

25/12/2022

May 𝑺𝒂𝒏𝒕𝒂 𝑪𝒍𝒂𝒖𝒔𝒆 bring you everything you wished for🎉🎁🙏.

23/12/2022

23/12/2022

20/12/2022

• PROBLEM OF THE DAY. 🤔

a. What is a mass spectrum?

b. Chlorine has two isotopes. The isotopic mass and percentage abundance of the heavier isotope are 36.98 and 24.95% respectively.
i) Calculate the isotopic mass of the lighter isotope;
ii) Sketch the mass spectrum of chlorine element.
[Ar(Cl ) = 35.5 ]

20/12/2022

Which of the following units is not a S. I units?
A. metre
B. kilogram
C. yard
D. seconds.

20/12/2022

The two(2) types of bonds in ammonium chloride, NH4Cl are
A. Covalent and Ionic
B. Metallic and Ionic
C. Polar covalent and Ionic
D. Coordinate and covalent.