H2O Review

Front

What is the chemical composition of water?

Back

Water is a compound made of two hydrogen atoms and one oxygen atom (H2O).

Front

What type of substance is CO₂?

Back

CO₂ is a compound, specifically carbon dioxide.

Front

How do hydrogen and oxygen atoms relate to water?

Back

Hydrogen and oxygen atoms combine to form water, which is classified as a compound.

Front

What does the nucleus of an atom contain?

Back

The nucleus contains protons and neutrons.

Front

What is unique about water in terms of states of matter?

Back

Water is the only compound that commonly exists in all three states of matter: solid, liquid, and gas.

Front

Define a compound.

Back

A compound is a substance formed when two or more elements are chemically bonded together.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance that cannot be broken down into simpler substances, while a compound is made up of two or more elements.

Front

What is the state of water at 0 degrees Celsius?

Back

At 0 degrees Celsius, water can exist as ice (solid) or liquid, depending on the conditions.

Front

What happens to water when it freezes?

Back

When water freezes, it expands and becomes less dense, which is why ice floats on water.

Front

What is the chemical formula for water?

Back

The chemical formula for water is H2O.