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Grade 9/Science/SNC1DZ/Study_Sheet.md
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- For example, only five elements account for over 90% of the Earth's crust: oxygen, silicon, aluminum, iron and calcium. - For example, only five elements account for over 90% of the Earth's crust: oxygen, silicon, aluminum, iron and calcium.
# Naming
1. Write cation (metal) first
2. Write anion (non-metal) second
3. Change the ending of the non-metal to ```ide```.
# Decomposition
- A chemical change used t o break compounds down into simpler substances
- Energy must be ADDED
- Using electricity
- Adding thermal energy
# Catalyst
- Substance that SPEEDS UP a chemical change without being consumed OR changed itself
# Use Of Hydrogen Peroxide
- On cuts/scraps
- Blood has a catalyst = see bubbling O<sub>2</sub>
- Cleans contact lenses
- Bubbling removes dirt
- Bleaches
- React with compounds that provide color
- RESULT = no colour (bleach blond hair/teeth)