Chemistry

Question 1

What are the three things that make up an Atom?

Answer 1

Protons Neutrons & Electrons

Question 2

What is an Atom?

Answer 2

The simplest form of an element

Question 3

What is a compound?

Answer 3

A combination of two or more atoms

Question 4

What is the chemical symbol for Sodium? (Use your periodic table if you need to)

Answer 4

Na

Question 5

Whats the chemical symbol for Chlorine? (Use your periodic table if you need to)

Answer 5

Cl

Question 6

What is an molecule?

Answer 6

One or more atoms of an element combined

For Example:

An atom of hydrogen has the symbol H but in its normal state Hydrogen is a gas with the molecular formula H₂

Question 7

What is the molecular formula for Chlorine in its natural state?

Clue: This is its molecular formula as a gas

Answer 7

Cl₂

There are two atoms of chlorine in one molecule of chlorine gas

Question 8

What is the Atomic Number of an Element?

(You can use your periodic table for this)

Answer 8

Its the number of protons it has in its nucleus

Question 9

Whats the Atomic number of the element on the picture below?

Answer 9

Two

It has two protons in the nucleus

Question 10

What is this element?

Clue: The number of protons gives you the atomic number. You can look this up on your periodic table

Answer 10

Helium, atomic symbol He

Question 11

What is a state?

Answer 11

Solid

Liquid

Gas

Question 12

Common house salt is a molecular compound made from one atom of Sodium and one atom of Chlorine.

What is its molecular formula?

Answer 12

NaCl

One atom of Sodium combines with one atom of Chlorine

Salt crystals contain millions of molecules of NaCl combined together by molecular bonds

Question 13

What is respiration?

Answer 13

Respiration is a series of chemical reactions that take place in every living organism. They produce energy.