GCSE Science | Covalent Bonding Diagrams

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  • draw every outer electron on its shell
  • move them to the middle until every outer shell is full

Hydrogen H2

Oxygen O2

Water H2O

CH4

CO2

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GCSE Science | Lenses

What is the focal point? * the point at which rays or waves meet after reflection or refraction, or the point from which diverging rays or waves appear to proceed. What is focal length?
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GCSE Science | Concentration

* concentration = moles/ volume * concentraion: mol/dm3 * moles: mol * volume: cm3 * 1cm3 = 0.001dm3 (divide by 1000) Question 1 Question 2 Question 3 Volume of gases at room temperature and pressure * at room temperature
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GCSE Science | National Grid

National grid * electrical power is transferred at high voltages from power stations, and then transferred at lower voltages in each locality for domestic use Step-up transformers * increases the voltage * this allows the cables