BC Science 10


An extensive compilation of study material, videos, worksheets, etc. related to Chemistry, Biology, and Physics which might just help you find what you’re looking for… Do check it out once! 🙂

Gabe the Tutor

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Chemistry: Extraction of Metals (NOTES)


Here’s an easy way to remember the reactions and other necessary details for the extraction of metals such as sodium, potassium, calcium, and aluminum.

Here’s a link to the PDF file for the aforementioned notes:

NOTES – Extraction of Metals (Handwritten)

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This work by Helpline for ICSE Students (Class X – Class 10) is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

You may print these notes through the PDF file and refer to them as required. We would appreciate it if you abstain from reproducing any part of these notes without our prior permission. For more information, please contact us. Thank you.

Do check out the notes! 🙂

Chemistry: Sulphuric Acid, Nitric Acid, Hydrogen Chloride, Ammonia (NOTES)


The following are my handwritten notes on these chapters of Chemistry:

– Sulphuric Acid

– Nitric Acid

– Hydrogen Chloride

– Ammonia

Here’s a link to the PDF file for notes on the aforementioned chapters:

NOTES – Sulphuric Acid, Nitric Acid, Hydrogen Chloride, Ammonia

Creative Commons License
This work by Helpline for ICSE Students (Class X – Class 10) is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

You may print these notes through the PDF file and refer to them as required. We would appreciate it if you abstain from reproducing any part of these notes without our prior permission. For more information, please contact us. Thank you.

Question of the Day #6


Without any further delay, the answers to the previous question are: (a)Hydrogen Sulphide (b) Nitrogen Dioxide or Bromine (c) Carbon Dioxide (d) Chlorine (e) Hydrogen (f) Carbon Dioxide (g) Ammonium Chloride.

Please note the change in the sequence of letters. By mistake, I had previously repeated the ‘(c)’.

Apparently, Shrish is the only reader who offered ‘bromine’ as a second answer in (b) so hats off to him! Ishan, meanwhile, gave a precise answer for (g). They both got all attempted answers correct! Congratulations to them and everyone else who got most answers correct. 🙂

Regarding the current question (f), ammonia cannot be an option as fire extinguishers include ammonium phosphate to extinguish a flame and not merely ammonia. Hence, carbon dioxide is the ideal answer.

Question of the Day: Differentiate between ‘centromere’ and ‘centrosome’.

Leave your answers in the comment section below and we will get back to you tomorrow with the correct answer! Thank you and keep visiting! 🙂 

Question of the Day #5


I was waiting for someone to answer the previous question and it has been two days since the question was posted, yet we have received no answer. So, here is the answer to the previous question: A meandering river may form an island (landform). A meandering river, being a river in its middle course,  also indicates a flat gradient due to reduced gravity and velocity, and land which is suitable for agriculture.

[My apologies for incorrectly writing the first half of the question – instead of ‘island’, it was supposed to be ‘landform’. ]

Question of the Day: What do you conclude on observing the following: (a) smell of rotten eggs, (b) reddish-brown gas, (c) gas that turns lime water milky, (d) greenish-yellow gas, (e) a gas that produces a ‘pop’ sound on coming in contact with oxygen, (f) a gas that extinguishes a flame on coming in contact with it, and (g) dense white fumes.

Good luck! Hoping we receive more feedback than last time! Leave your answer in the comment section below and we will update this tomorrow with the correct answer! 🙂