In any chemical reaction, the total amount of matter in the system remains exactly the same.

The rusting of iron is considered a physical change because only the appearance of the metal is altered.

The atomic number of a chemical element is equal to the number of neutrons found in its nucleus.

Sterling silver is a term used for jewelry made of 100% pure silver.

The shortest distance between two points is always a straight line, regardless of the geometry of the surface.

Sound travels faster in water than it does in air.

Zero is considered an even number.

The number 1 is the smallest prime number.

A Mobius strip is a two-dimensional object that has only one side.

In the "Monty Hall" problem (a game show with three doors), if the host opens a door to reveal a goat, switching your choice gives you a better chance of winning than staying with your original door.

The Sahara is largest desert in the world.