Introduction to Chemistry

Question 1

What is an atom?

Answer 1

The smallest particle of matter and is made up of protons, neutrons and electrons.

Question 2

What is an element?

Answer 2

It is only made up of one sort of atom.

Question 3

What is a molecule?

Answer 3

Two or more atoms covalently bonded together. The atoms can be of the same element or different elements.

Question 4

What is a compound?

Answer 4

Two or more different types of atoms bonded together. The bonding can be either ionic or covalent.

Question 5

What is a mixture?

Answer 5

Two or more different elements and/or compounds in the same space. They can be separated into the individual components.

Question 6

Which compound ions form +1 ions?

Answer 6

Ammonium, NH4+

Question 7

Which compound ions form -1 ions?

Answer 7

• Hydroxide, OH-
• Nitrate, NO3-
• Hydrogen Sulfate, HSO4-
• Hydrogencarbonate, HCO3-
• Dihydrogenphospate, H2PO4-

Question 8

Which compound ions form -2 ions?

Answer 8

• Carbonate ion, CO32-
• Sulfate ion, SO42-
• Hydrogen phosphate, HPO42-

Question 9

Which compound ions form -3 ions?

Answer 9

Phosphate ion, PO43-

Question 10

What is an acid?

Answer 10

A substance that donates H+ ions.

Question 11

What is a base?

Answer 11

A substance that accepts H+ ions.

Question 12

What is an alkali?

Answer 12

A base that releases hydroxide ions in aqueous solution.

Question 13

What is a salt?

Answer 13

It is formed when the hydrogen ions from an acid are replaced by a metal or ammonium ion.