End of year exam prep - Year 9 2024 Flashcards
What’s the equation for the rate of reaction?
rate = Change in Vol/ Change in Time
Collision Theory - When SA more exposed/bigger
More frequent collisions
Collision theory - Higher concentration/more crowded
More frequent collisions
Collision theory - Hotter particles ( faster moving )
More frequent collisions and more energetic collisions
How was Mendeleev’s periodic table different and why was it accepted?
His was ordered by atomic mass but was accepted because it correctly predicted the properties of elements that had not yet been discovered
What is the ordering of elements on the modern periodic table?
Increasing atomic number
What is the significance of the group number?
It is the number of electrons on the outer shell
What does group one on the periodic table consist of?
Alkali Metals
How can you tell how many electrons there are in an element?
The atomic number ( number on the top)
Relative charge and mass of a proton
Mass - 1
Charge - +1
Relative charge and mass of a neutron
Mass - 1
Charge - 0
Relative charge and mass of an electron
Mass - 0.0005
Charge - -1
How do you work out how many neutrons there are in an atom
Mass number - atomic number
What are covalent molecules
two non metals sharing a pair of electrons
Structure of covalent molecules
- simple molecular
-Held together by weak intermolecular forces
