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Summer Chemistry Challenge 8 – Solution!

The correct answer is B. The reaction is exothermic and ΔH = −150 kJ.

When a reaction releases heat to the surroundings, it is exothermic. Because energy leaves the system, the enthalpy change, ΔH, is negative.

Exothermic = heat released = negative ΔH

Did you get this one right? Let me know in the comments!

Stay tuned for Summer Chemistry Challenge No. 9 next week!

Summer Chemistry Challenge #7 – Solution!

The correct answer is B. C₂H₄

C₂H₄ is an alkene because it contains a carbon-carbon double bond (C=C). Alkenes are unsaturated hydrocarbons with at least one C=C double bond.

Did you get it right?

Let me know your answer in the comments and share this reel with someone who loves chemistry!

Stay tuned for Summer Chemistry Challenge #8 coming next week!

Summer Chemistry Challenge #6 – Solution (Part 2)

Let's complete the challenge!

In this video, I explain why the other options, Butene, and Cyclobutane are not isomers of butane.

Remember: To be isomers, compounds must have the same molecular formula but different structural arrangements.

Part 1: https://www.facebook.com/share/v/1K33nUQrqr/

Did you get the challenge right? Let me know in the comments, and stay tuned for Summer Chemistry Challenge #7 next week!

Summer Chemistry Challenge #6 – Solution (Part 1)

The correct answer is B. 2-Methylpropane ✅

But how do we know?

In this video, I explain what isomers are and why 2-methylpropane is the compound with the same molecular formula (C₄H₁₀) as butane but a different structural arrangement.

Understanding this concept makes organic chemistry much easier!

Part 2 is available now, (https://www.facebook.com/share/r/1Fx6prpAwg/) where I explain why the other two c and d options are not isomers of butane.

Summer Chemistry Challenge #5 – Solution!

The correct answer is A. H₂O✅

Here's why:

Let's compare the percentage by mass of oxygen in each compound:

H₂O: Oxygen = 88.8%
CO₂: Oxygen = 72.7%
H₂SO₄: Oxygen = 65.3%
CaCO₃: Oxygen = 48.0%

H₂O contains the highest percentage by mass of oxygen (88.8%). That means the correct answer is A. H₂O.

Did you get it right? Let me know in the comments!

Keep an eye out for Summer Chemistry Challenge #6 next week. More fun chemistry questions are on the way!