ALL CHEMISTRY INFO, PICTURES, VIDEOS AND WORKSHEETS CAN BE FOUND IN THE TABS ON THE LEFT
MAKE SURE YOU HAVE A LOOK!!
MAKE SURE YOU HAVE A LOOK!!
ATOMS
What is an Atom ?All substances are made up of matter and the fundamental unit of matter is the atom. The atom constitutes the smallest particle of an element. The atom is made of a central nucleus containing protons (positively-charged) and neutrons (with no charge). The electrons (negatively-charged with negligible mass) revolve around the nucleus in different imaginary paths called orbits or shells.
What is an Element ?An element is a substance made up of atoms of one kind. There are about 82 naturally-occurring elements and about 31 artificially-made elements as listed in the Periodic Table
What is a Molecule ?A molecule is formed when atoms of the same or different elements combine. A molecule is the smallest particle of a substance that can normally exist independently.
Examples:
Examples:
What is an Element ?An element is a substance made up of atoms of one kind. There are about 82 naturally-occurring elements and about 31 artificially-made elements as listed in the Periodic Table
What is a Molecule ?A molecule is formed when atoms of the same or different elements combine. A molecule is the smallest particle of a substance that can normally exist independently.
Examples:
- Two atoms of oxygen combine to form a molecule of oxygen [O2].
- One atom of carbon combines with two atoms of oxygen to form a molecule of carbon dioxide [CO2].
Examples:
- Hydrogen and oxygen are combined in a fixed proportion of 2:1 to form the compound water [H2O].
- Carbon and oxygen are combined in a fixed proportion of 1:2 to form the compound carbon dioxide [CO2].
Homework questions - fill out on an A4 sheet and hand in next class
1. What are the 4 different types of reactions? Explain each and give 2 examples of each
2. What are the factors that can affect reaction rate? explain how each of these factors can affect how quickly the reaction occurs.
2. Why does food in your fridge not go off as quickly as when you leave it out? Explain using reaction rates.
3. What is the difference between elements, compounds and mixtures?
4. What is Nacl? (common table salt) is it a compound, or a mixture? EXPLAIN