endothermic energy change
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positive energy change
more chemical energy when finished cause heat energy is changed to chemical
temp gets cold
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endothermic energy change
positive energy change
more chemical energy when finished cause heat energy is changed to chemical
temp gets cold
endothermic reaction profile
small curve to higher products line at the end
endothermic example reactions
decomposition reactions
acid + hydrocarbonate
exothermic energy change explanation
more energy released making bonds than is needed to break bonds
exothermic reaction profile
big curve to low products line at the bottom
endothermic energy change explanation
less energy released making bonds than is needed to break bonds
burning fuels example reactions
methane + oxygen
hydrogen + oxygen
propane (C3H8) + oxygen
acid and alkali example reactions
sulphuric acid + sodium hydroxide
acid + hydroxide
exothermic energy change
negative energy change
less chemical energy when finished cause some of the energy changed to heat energy
temp gets hot
exothermic example reactions
acid + alkali
burning fuels
displacement reactions
how to make a simple cell
2 different metals in an electrolyte
what is a battery
2 or more cells joined together
cathode
positive
reduction
how is current carried through the wires
electrons
what affects the potential difference of the cell
bigger the difference in reactivity of the metals = bigger potential difference
identity and/or conc of the electrolyte
how to recharge electrochemical cells
the reactions in the cell must be reversible so a current can drive them in the opposite directions and reform the orginal reactants
how is current carried through the electrolyte
ions
anode
negative
oxidation
which metal is the negative electrode and why
the ones that gives out electrons the easiest (most reactive 1)
