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chemistry - Coggle Diagram
chemistry
chemical symbols and formulae
consists of one or two letters
always starts with a capital letter any other letter is lower case
a chemical formula is used to represent an element or compound in balanced chemical equations
exothermic and end thermic reactions
endothermic
decrease in temperature
energy is taken from surroundings
if the energy change on a energy level digram is positive is positive its endothermic
exothermic
increase of temperature
if the energy change on a energy level diagram is negative its exothermic
energy is given out to its surrounding
a thermometer is used to measure temperature change
in a polystyrene cup should be used in a practical that measures heat change
chemical equations
a word equation represents a chemical reaction using the names of the substances involved
word equations do not show any chemical symbols
they use this form; reactants ----> products