About Chemistry Quiz #843
Chemistry Quiz #843 was the quiz for Friday, October 23, 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 #843
- Which method separates sand from water using paper?
- Which acid gives lemons and limes their sour taste?
- What is the hardest natural substance?
- What do we call the amount of mass packed into a given volume?
- What is the chemical formula for table salt (sodium chloride)?
- Which method separates liquids by boiling and cooling the vapour?
- Which of these is a sign of a chemical change?
- What are atoms of the same element with different numbers of neutrons called?
- In salt water, what is the water called?
- Which element is the most common in Earth's crust?
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 #846, Oct 26
- Chemistry Quiz #845, Oct 25
- Chemistry Quiz #844, Oct 24
- Chemistry Quiz #842, Oct 22
- Chemistry Quiz #841, Oct 21
- Chemistry Quiz #840, Oct 20
- Today’s quiz, #851
Every day of the last 60 is in the puzzle archive.