Why is water called a polar molecule?

It has slightly positive and negative ends

Why is water called the universal solvent?

It dissolves more substances than any other liquid

What makes water hard?

Dissolved calcium and magnesium

Water Chemistry Trivia Quiz – Names, Facts and Surprises

This water chemistry trivia quiz covers the H2O molecule, hydrogen bonds, surface tension, water as a solvent, hard and soft water, pH and why ice floats. Ten questions bring names, facts and surprises about the most important liquid on Earth.

Start Water Chemistry Trivia Quiz

🎯 Daily Trivia Challenge • 🧠 10 Questions • ⏱️ 150 Seconds

Question 1 / 10 Time: 150s

Formula
How many hydrogen atoms are in a water molecule?
Polar
Why is water called a polar molecule?
Solvent
Why is water called the universal solvent?
Tension
What lets some insects walk on water?
Ice
What happens to water's density when it freezes?
Hard
What makes water hard?
Heat
Why do oceans warm and cool slowly?
Density
At what temperature is liquid water densest?
Capillary
What helps water climb up plant stems?
Earth
About what percentage of Earth's water is fresh water?

Explanations: answer key for all 10 questions

Q1: How many hydrogen atoms are in a water molecule?
Answer: Two
Water is H2O.
Q2: Why is water called a polar molecule?
Answer: It has slightly positive and negative ends
Oxygen pulls electrons more strongly.
Q3: Why is water called the universal solvent?
Answer: It dissolves more substances than any other liquid
Salt and sugar dissolve easily in water.
Q4: What lets some insects walk on water?
Answer: Surface tension
Hydrogen bonds pull surface molecules together.
Q5: What happens to water's density when it freezes?
Answer: It decreases
That is why ice floats and lakes freeze from the top.
Q6: What makes water hard?
Answer: Dissolved calcium and magnesium
It leaves limescale in kettles.
Q7: Why do oceans warm and cool slowly?
Answer: Water has a high specific heat
This moderates coastal climates.
Q8: At what temperature is liquid water densest?
Answer: About 4 °C
Deep lakes stay about 4 °C in winter.
Q9: What helps water climb up plant stems?
Answer: Capillary action
Water molecules stick to narrow tubes.
Q10: About what percentage of Earth's water is fresh water?
Answer: About 3%
Most fresh water is frozen in ice caps.

Water Chemistry Trivia Quiz – The Remarkable Liquid

Water seems simple, just two hydrogen atoms and one oxygen atom, but it has extraordinary properties. Because its molecule is bent and polar, water molecules attract each other through hydrogen bonds.

These bonds give water high surface tension, a high boiling point and the ability to store heat. Water dissolves many substances, carrying nutrients in blood, plants and soil. Unusually, solid ice is less dense than liquid water, so it floats.

Water chemistry affects daily life, from hard water limescale to water treatment and pH. Protecting clean water is one of the most important challenges for people and ecosystems.

What This Quiz Teaches

This quiz is for students exploring water chemistry.

Why water is polar
Why it dissolves so much
What surface tension is
Why ice floats
What hard water is

Did You Know?

Water covers about 71% of Earth's surface.
Pure water conducts electricity poorly.
Heavy water contains deuterium.
Water expands when frozen, cracking rocks.
Adult humans are about 60% water.