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Chemistry for Young Explorers

Chemistry

A collection of medium-difficulty, fact-based chemistry questions suitable for pre-teens, covering fundamental concepts.

science chemistry education knowledge facts
18 Questions Medium Ages 9+ Apr 6, 2026
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About this Study Set

This study set covers Chemistry through 18 practice questions. A collection of medium-difficulty, fact-based chemistry questions suitable for pre-teens, covering fundamental concepts. Every question includes the correct answer so you can learn as you go — pick any format above to get started.

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Browse all 18 questions from the Chemistry for Young Explorers study set below. Each question shows the correct answer — select a study format above to practice interactively.

1 What is the chemical symbol for water?
  • A O2
  • B H2O
  • C CO2
  • D NaCl
2 Which gas do plants take in from the air for photosynthesis?
  • A Oxygen
  • B Nitrogen
  • C Carbon Dioxide
  • D Hydrogen
3 What is the hardest natural substance on Earth?
  • A Gold
  • B Iron
  • C Diamond
  • D Salt
4 Which element makes up most of the Earth's atmosphere?
  • A Oxygen
  • B Carbon
  • C Nitrogen
  • D Helium
5 What state of matter has a definite shape and a definite volume?
  • A Liquid
  • B Gas
  • C Solid
  • D Plasma
6 What is the process called when a liquid turns into a gas?
  • A Melting
  • B Freezing
  • C Condensation
  • D Evaporation
7 Which common household item is an acid?
  • A Baking Soda
  • B Vinegar
  • C Soap
  • D Sugar
8 What are the tiny particles that make up all matter called?
  • A Cells
  • B Atoms
  • C Molecules
  • D Minerals
9 What is the chemical symbol for iron?
  • A Ir
  • B Fe
  • C In
  • D I
10 Which metal is often used in electrical wires because it conducts electricity well?
  • A Aluminum
  • B Iron
  • C Copper
  • D Silver
11 What is the process called when a gas turns into a liquid?
  • A Evaporation
  • B Boiling
  • C Condensation
  • D Sublimation
12 Which gas is essential for humans and animals to breathe?
  • A Carbon Dioxide
  • B Nitrogen
  • C Oxygen
  • D Methane
13 What is the chemical symbol for gold?
  • A Go
  • B Au
  • C Ag
  • D Gd
14 What is the name for a substance that speeds up a chemical reaction without being used up itself?
  • A Inhibitor
  • B Catalyst
  • C Reactant
  • D Product
15 What is the common name for sodium chloride?
  • A Baking Soda
  • B Vinegar
  • C Sugar
  • D Table Salt
16 Which state of matter has a definite volume but no definite shape?
  • A Solid
  • B Gas
  • C Liquid
  • D Plasma
17 What is the chemical symbol for helium?
  • A He
  • B H
  • C El
  • D Hm
18 What type of change involves the formation of new substances?
  • A Physical Change
  • B Chemical Change
  • C Phase Change
  • D Mechanical Change
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