Chemistry Revision

Question 1

What is an Element?

Answer 1

It’s a Molecule made of the same types of Atoms

Question 2

What is a Compound?

Answer 2

Two or more Elements joined chemically together.

Question 3

What is a Mixture?

Answer 3

A combination of two or more pure substances in which each pure substance retains its individual chemical properties.

Question 4

What is an atom?

Answer 4

An Atom consist of electrons surronding a nucleus that contains 3 subatomic particles.

Question 5

An atom is composed of 3 types of subatomic particles, these are?

Answer 5

• Protons
• Neutrons
• Electrons

Question 6

Atoms have no overall electrical charge, however the particles contain specific charge, what are they?

Answer 6

Protons - positive (+)
Neutron - Neutral ( 0 )
Electron - Negative ( - )

Question 7

What is an atomic number?

Answer 7

Each atom is specific element contains the same number of protons. Each element has a unique atomic number, which is also used to arrange the elements in the periodic table.
Atomic Number = Number of Protons

Question 8

What is an atomic mass?

Answer 8

Atomic Mass is the number of protons and neutrons in an atom of an element which is called Atomic mass, or mass number.
Atomic mass = Number of protons + number of neutrons.

Question 9

How do you calculate subatomic particles from atomic number and mass number?

Answer 9

Atomic number = the number of protons
Mass Number = the number of protons + the number of neutrons
Number of neutrons = mass number - Atomic mass

Question 10

What are Isotopes?

Answer 10

Atoms of the same element with the same atomic number but diffrent atomic masses are called Isotopes of that element.

Question 11

What is a relative atomic mass?

Answer 11

The relative atomic mass of an element compare the atoms of the elements with the isotopes.