About Chemistry Quiz #841
Chemistry Quiz #841 was the quiz for Wednesday, October 21, 2026: 10 questions: 3 easy, 4 medium and 3 hard. Everyone who played Chemistry Quiz that day got the same quiz, and it stays here to play for 60 days.
The questions of Chemistry Quiz #841
- Which metal does a magnet attract?
- What is the centre of an atom called?
- What is glass mainly made from?
- Which substance has the chemical formula O₃?
- What does an element's atomic number tell you?
- What is the green coating that forms on copper, like on the Statue of Liberty?
- Which element is the most common gas in the air?
- What is the chemical formula for calcium carbonate?
- Which acid builds up in muscles during hard exercise?
- Which substance has the chemical formula CaCO₃?
The answer options and the answers appear only when you play the quiz, one question at a time.
New to Chemistry Quiz? The rules, tips and common questions are on the Chemistry Quiz page, and Periodic Table Memory Tips for the Quiz goes into strategy.
Other days of Chemistry Quiz
- Chemistry Quiz #844, Oct 24
- Chemistry Quiz #843, Oct 23
- Chemistry Quiz #842, Oct 22
- Chemistry Quiz #840, Oct 20
- Chemistry Quiz #839, Oct 19
- Chemistry Quiz #838, Oct 18
- Today’s quiz, #851
Every day of the last 60 is in the puzzle archive.