Chemistry energy Flashcards
Can energy be created or destroyed?
No, it is eternal
What is condensation?
When water vapour cools back to the liquid state
What is evaporation?
Water once it has boiled and is in it’s gaseous form.
When does something have the energy store ‘gravitational potential’?
When it is a substantial amount above the earth’s surface
Name 4 non-renewable energy types
Nuclear, coal, oil, natural gas
Name an example of the renewable energy source fuelled by water
Tidal
Name an example of the renewable energy source fuelled by the sun’s light
Solar
Name an example of the renewable energy source fuelled by the wind
Wind turbines
Name the renewable energy source fuelled by volcanoes
Geothermal
Give an example of the renewable energy source. ‘Biomass’
Pulp/paper mills
Define efficiency
A way that uses the least amount of energy
The total energy stored before = ?
The total energy stored after
Name the 5 types of energy stores
Kinetic, gravitational potential, thermal, elastic potential, chemical.
How can you calculate efficiency?
Total energy out / total useful energy
Why are metals good conductors?
They have free moving electrons.
How is conduction in solids caused?
By vibrations passing from one atom to another.
What is heat measured in?
Joules ( J )
What is temperature measured in?
Degrees celsius ( c )
True or false? Convection in a liquid begins with conduction through its container
True
True or false? Convection in gases occur when the gas expands, becomes more dense and rises.
False. It expands, becomes LESS dense and rises, allowing it to rise in the first place above the more dense air around it.
Which energy store does an objects energy move to when it is dropped from a great height
It moves from gravitational potential to kinetic
Which energy store is in a battery?
Chemical
Which energy store does a hot water bottles energy go into?
Trick question: it goes from its thermal store to yours
How does a battery in a smartphone conserve energy?
It transfers chemical energy to infra red light waves and internal energy.
