About Chemistry Quiz #842
Chemistry Quiz #842 was the quiz for Thursday, October 22, 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 #842
- What gas fizzes out when baking soda and vinegar are mixed?
- What is the chemical name for rust?
- What is the chemical name for table salt?
- What is rock containing a useful metal called?
- Which colourless, odourless gas from faulty furnaces is why homes need detectors?
- What is a combination of substances that are not chemically joined called?
- Which liquid is often called the universal solvent?
- Which law says matter is not created or destroyed in a chemical reaction?
- Which element gives fireworks a yellow colour?
- Which substance has the chemical formula H₂SO₄?
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 #845, Oct 25
- Chemistry Quiz #844, Oct 24
- Chemistry Quiz #843, Oct 23
- Chemistry Quiz #841, Oct 21
- Chemistry Quiz #840, Oct 20
- Chemistry Quiz #839, Oct 19
- Today’s quiz, #851
Every day of the last 60 is in the puzzle archive.