About today's quiz
Chemistry — Beginner
A new quiz is published every day for this topic and level. Answer the questions, read the explanations, and complete the quiz to keep your streak alive.
Tips before you start
- •Read every question carefully before answering. Some questions include subtle wording that changes the correct answer.
- •Take your time on the first question. There is no time limit, but your total time is tracked for your statistics.
- •After each answer, read the explanation. Even correct answers often include useful context you might not know.
- •Come back tomorrow for a brand new quiz on the same topic. Daily practice is the most effective way to retain what you learn.
BeginnerScience
Today's questions
Today's quiz questions
These are the questions that make up today's quiz. Test your knowledge, see how much you know, and learn from the explanation behind every answer.
1.What is the chemical formula for table salt?
- •NaCl
- •NaOH
- •KCl
- •HCl
2.Which gas is produced when you mix baking soda and vinegar?
- •Hydrogen (H2)
- •Nitrogen (N2)
- •Carbon dioxide (CO2)
- •Oxygen (O2)
3.What are the three subatomic particles?
- •Solids, liquids, and gases
- •Protons, neutrons, and electrons
- •Photons, quarks, and leptons
- •Atoms, molecules, and ions
4.What happens to water when it freezes?
- •It expands and becomes less dense, which is why ice floats
- •Its chemical formula changes from H2O to H3O
- •It contracts and becomes more dense
- •It releases oxygen gas into the air
5.What is rust?
- •Dirt that sticks to metal
- •Iron oxide formed when iron reacts with oxygen and water
- •A type of bacteria that grows on metal
- •Paint that peels off metal surfaces
6.What are noble gases?
- •Gases that are only found deep underground
- •Radioactive gaseous elements
- •Group 18 elements that are very stable and rarely react
- •Gases that are extremely toxic to humans
7.How many elements are in the periodic table (approximately)?
- •150
- •64
- •92
- •118
8.What does H2O2 represent?
- •Heavy water
- •Hydrogen peroxide
- •Hydrochloric acid
- •Water
9.What is an element?
- •Any substance that can be found in nature
- •A substance that dissolves in water
- •A mixture of two or more atoms
- •A pure substance made of one type of atom
10.What is the difference between metals and non-metals?
- •Metals are always solid; non-metals are always gases
- •Metals are found on the right side of the periodic table
- •Metals usually conduct and are malleable; non-metals generally do not
- •Non-metals are heavier than metals