Final Review 2nd Semester - Physical Science

Front

What is the chemical symbol for element number 15 on the periodic table?

Back

The chemical symbol for element number 15 is P (Phosphorus).

Front

What is a pure substance?

Back

A pure substance is a kind of matter that always has a specific composition chemically combined.

Front

What type of reaction is represented by the equation Ca + AlCl3 → CaCl2 + Al?

Back

This is a Single replacement reaction.

Front

What do the numbers down the side of the periodic table indicate about the atoms in each row?

Back

The numbers indicate the number of energy levels.

Front

What is the name of group 2 on the periodic table?

Back

Group 2 is known as alkaline earth metals.

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom.

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 chemically combined.

Front

What is the significance of the atomic mass of an element?

Back

The atomic mass is the weighted average mass of an element's isotopes, reflecting the number of protons and neutrons in the nucleus.

Front

What are alkali metals?

Back

Alkali metals are the elements in group 1 of the periodic table, known for being highly reactive and having one electron in their outermost shell.

Front

What is a chemical reaction?

Back

A chemical reaction is a process that involves the rearrangement of the molecular or ionic structure of a substance.