Revision 3-Chemical Energy Changes Flashcards
What is a reactant?
A substance that takes part and changes in a chemical reaction e.g.Magnesium and Oxygen
What is a product?
Something that is formed out of two reactants reacting together in a chemical reaction e.g.Magnesium Oxide
What is the word equation for copper and oxygen?
Copper+Oxygen👉Copper Oxide
What is endothermic?
When the reacting mixture takes in the energy from the surroundings making the mixture and the surroundings cold
What is exothermic?
When the reacting mixture gives out energy to the surroundings making the surroundings and the mixture hot
How can you identify an endothermic reaction?
When the temperature of the mixture decreases
How can you identify an exothermic reaction?
When the temperature of the mixture increases
What is temperature?
It is a measurement
It is measured in Celsius
What is heat?
It is an energy
It is measured in joules
What is temperature in terms of particles?
The higher the temperature, the faster the particles travel because heat is energy. The hotter the mixture/object is means that the amount of energy in the particles is high
What is heat in terms of particles?
When the particles are heated they move quicker, no matter the size or weight of the object being heated
Name the three fossil fuels
Coal
Oil
Gas
Describe coal formation
A tree on a hill falls down (during photosynthesis) and rots away. It doesn’t decomposes in the swamp where it fell because there is no oxygen in it. Over millions of years the ground builds up and the tree is squashed in the layers (called compaction). The factories then drill down into the Earth to collect the coal
Describe oil formation
The animals die and collect on the sea bed. The layers build up and there is no oxygen (called compaction). The drills hit the sea bed and create oil puddles which they then collect
Describe gas formation
It is the same as oil formation but they burn it so it evaporates to make the gas
