Y9 Science Exam Notes

Minerals for Plant Growth:
- Essential minerals for healthy plants include:
- Magnesium: needed for chlorophyll production.
- Nitrates: needed for protein synthesis.
Carbon Cycle:
- Key processes include:
- Photosynthesis
- Respiration
- Feeding
- Decomposition
- Combustion
Climate Change Impacts:
- Possible future outcomes:
- Sea level rise
- Increased flooding
- Drought conditions
- More extreme weather events
Atomic Structure:
- Components of an Atom:
- Protons: positively charged particles
- Electrons: negatively charged particles
- Neutrons: neutral particles
- Ability to calculate the number of each from atomic and neutron numbers.
- Electron Configuration: expressed in a 2,8,8 format.
- Interpreting an atom's group number and period from its electron configuration.
- Using the Periodic Table to determine an element’s structure and properties.
Group 1 Alkali Metals:
- Understanding their chemical and physical properties.
Molecules and Bonds:
- Formation of molecules: when two or more atoms join via covalent bonds.
- Definition of a covalent bond: formed by a shared pair of electrons (limited to single bonds).
Ions and Ionic Bonds:
- Definition of an ion:
- Gains electrons = negatively charged
- Loses electrons = positively charged
- Ionic bond: attraction between positively and negatively charged ions.

Textbook:
- P20-21: Minerals
- P24-41: Carbon cycle and Climate change
- P48-51: Atomic Structure
- P60-70: Ionic and Covalent bonds