Bacola Benchmark Review December 2023

Front

What is the atomic number for iron?

Back

The atomic number for iron is 26.

Front

What does physical weathering refer to?

Back

Physical weathering is the process of breaking down rocks and minerals through physical forces without changing their chemical composition.

Front

Why do water molecules stick together?

Back

Water molecules stick together because one side has a positive charge and the other side has a negative charge, creating hydrogen bonds.

Front

What is the chemical formula for water?

Back

The chemical formula for water is H₂O.

Front

What is the center of an atom called?

Back

The center of an atom is called the nucleus.

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together.

Front

What is the difference between physical and chemical changes?

Back

Physical changes alter the form of a substance but not its chemical composition, while chemical changes result in the formation of new substances.

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means.

Front

What is the pH scale?

Back

The pH scale measures how acidic or basic a solution is, ranging from 0 (very acidic) to 14 (very basic), with 7 being neutral.

Front

What is a chemical reaction?

Back

A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.