Elementary Chemistry Facts

Chemistry

A collection of challenging, fact-based chemistry questions suitable for elementary school students, covering fundamental concepts.

elements compounds states of matter atoms molecules chemical reactions

15 Questions Hard Ages 5+ Aug 3, 2026

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About this Study Set

This study set covers Chemistry through 15 practice questions. A collection of challenging, fact-based chemistry questions suitable for elementary school students, 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 15 questions from the Elementary Chemistry Facts study set below. Each question shows the correct answer — select a study format above to practice interactively.

1 What is the chemical symbol for the element that makes up most of the air we breathe?

2 Which of these is a pure substance made of only one type of atom?

A Water
B Salt
C Gold
D Sugar

3 What common household substance is made by chemically combining sodium (Na) and chlorine (Cl)?

A Baking soda
B Vinegar
C Table salt
D Bleach

4 When water turns into ice, what state of matter is it changing into?

A Gas
B Liquid
C Solid
D Plasma

5 What tiny particles are the basic building blocks of all matter?

A Molecules
B Atoms
C Cells
D Grains

6 What is the name for two or more atoms joined together, like the two oxygen atoms and one hydrogen atom in a water molecule?

A Element
B Compound
C Mixture
D Molecule

7 Which element has the chemical symbol 'O' and is essential for us to breathe?

A Hydrogen
B Nitrogen
C Carbon
D Oxygen

8 What happens to a substance during a chemical reaction, like when wood burns?

A It changes shape
B It changes state
C It changes into a new substance
D It gets colder

9 What is the chemical formula for water, showing it is made of two hydrogen atoms and one oxygen atom?

A CO2
B H2O
C NaCl
D O2

10 Which of the following is a liquid at room temperature?

A Iron
B Water
C Glass
D Wood

11 What is the most common element in the Earth's crust?

A Iron
B Silicon
C Aluminum
D Oxygen

12 When steam cools down and turns back into liquid water, what is this process called?

A Evaporation
B Melting
C Condensation
D Freezing

13 What is the chemical symbol for the element that is the main component of helium balloons?

A H
B O
C He
D Ne

14 What is the name of the process where a liquid turns into a gas, like water boiling into steam?

A Condensation
B Freezing
C Melting
D Evaporation

15 Which of these is an example of a compound?

A Oxygen gas (O2)
B Pure gold (Au)
C Carbon dioxide (CO2)
D Helium gas (He)

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