About Chemistry Quiz #839
Chemistry Quiz #839 was the quiz for Monday, October 19, 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 #839
- What scale measures how acidic or basic a substance is?
- Which particle in an atom has no charge?
- What three things does a fire need?
- What is a substance made of two or more elements chemically joined called?
- What is the slow reaction that turns iron into rust?
- Which gas makes bread dough rise when yeast feeds on sugar?
- Marie Curie named polonium after which country?
- What is the chemical formula for baking soda (sodium bicarbonate)?
- Which substance has the chemical formula NaHCO₃?
- What is the chemical formula for sodium hydroxide?
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 #842, Oct 22
- Chemistry Quiz #841, Oct 21
- Chemistry Quiz #840, Oct 20
- Chemistry Quiz #838, Oct 18
- Chemistry Quiz #837, Oct 17
- Chemistry Quiz #836, Oct 16
- Today’s quiz, #851
Every day of the last 60 is in the puzzle archive.