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Basic Chemistry Knowledge

Chemistry

A collection of easy, fact-based multiple-choice questions covering fundamental chemistry concepts.

chemistry science basic elements compounds
20 Questions Easy Ages 5+ Aug 11, 2026
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About this Study Set

This study set covers Chemistry through 20 practice questions. A collection of easy, fact-based multiple-choice questions covering fundamental chemistry 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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1 What is the chemical symbol for water?
  • A O2
  • B H2O
  • C CO2
  • D NaCl
2 Which element is the most abundant in the Earth's atmosphere?
  • A Oxygen
  • B Carbon Dioxide
  • C Nitrogen
  • D Argon
3 What is the common name for a substance with a pH of 7?
  • A Acidic
  • B Basic
  • C Neutral
  • D Alkaline
4 Which of the following is a noble gas?
  • A Oxygen
  • B Hydrogen
  • C Neon
  • D Chlorine
5 What is the chemical symbol for gold?
  • A Ag
  • B Au
  • C Fe
  • D Cu
6 What state of matter has a definite shape and definite volume?
  • A Gas
  • B Liquid
  • C Solid
  • D Plasma
7 What is the smallest unit of an element that retains the chemical properties of that element?
  • A Molecule
  • B Compound
  • C Atom
  • D Ion
8 Which element has the atomic number 1?
  • A Helium
  • B Oxygen
  • C Hydrogen
  • D Carbon
9 What type of bond involves the sharing of electrons between atoms?
  • A Ionic bond
  • B Metallic bond
  • C Covalent bond
  • D Hydrogen bond
10 What is the chemical symbol for iron?
  • A Au
  • B Ag
  • C Fe
  • D Na
11 Which gas is essential for respiration in humans?
  • A Carbon Dioxide
  • B Nitrogen
  • C Oxygen
  • D Methane
12 What is the process called when a liquid changes into a gas?
  • A Condensation
  • B Freezing
  • C Evaporation
  • D Melting
13 What is the most common element in the universe?
  • A Helium
  • B Oxygen
  • C Carbon
  • D Hydrogen
14 What is the chemical symbol for sodium?
  • A K
  • B Na
  • C Cl
  • D Mg
15 What is the term for a substance that cannot be broken down into simpler substances by chemical means?
  • A Compound
  • B Mixture
  • C Element
  • D Molecule
16 What is the process called when a gas changes into a liquid?
  • A Evaporation
  • B Melting
  • C Sublimation
  • D Condensation
17 What is the chemical symbol for carbon?
  • A Ca
  • B C
  • C Co
  • D Cr
18 Which of the following is an example of a compound?
  • A Oxygen (O2)
  • B Gold (Au)
  • C Salt (NaCl)
  • D Iron (Fe)
19 What is the term for a substance that increases the rate of a chemical reaction without being consumed?
  • A Inhibitor
  • B Catalyst
  • C Solvent
  • D Reactant
20 What is the chemical symbol for copper?
  • A Ag
  • B Au
  • C Fe
  • D Cu
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