Understanding Changes in Matter

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. Each element is made up of atoms that have the same number of protons.

Front

What is a compound?

Back

A compound is a substance formed when two or more elements chemically bond together in a fixed ratio.

Front

What does the chemical formula CO₂ represent?

Back

The chemical formula CO₂ represents carbon dioxide, which consists of one carbon atom and two oxygen atoms.

Front

How many different elements are in the compound Na₂SO₄?

Back

There are three different elements: sodium (Na), sulfur (S), and oxygen (O).

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances, involving the breaking and forming of bonds.

Front

What is saturation in a solution?

Back

Saturation occurs when a solution can no longer dissolve additional solute at a given temperature and pressure.

Front

What is the difference between a saturated and an unsaturated solution?

Back

A saturated solution contains the maximum amount of solute that can dissolve, while an unsaturated solution can still dissolve more solute.

Front

What is rusting?

Back

Rusting is a chemical change that occurs when iron reacts with oxygen and moisture, forming iron oxide (rust).

Front

What is the periodic table?

Back

The periodic table is a tabular arrangement of chemical elements, organized by increasing atomic number and grouped by similar properties.