Chemistry Module 3 Flashcards by Ariana Ahmed | Brainscape

Q

what happens in a chemical reaction?

A

formation of a new substance
eg. electrolysis of water, breaks down to h2 at the cathode and o2 at the anode

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Q

what happens in a physical reaction?

A

no formation of new substance
change in shape of state
eg. freezing of water to ice

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Q

indicators of chemical change?

A

change in temperature
change in colour: cooling of vessel changes 2no (red/brown colour) to n2o4 (colourless)
formation of odour
formation of a precipitate: silver nitrate + potassium chloride; from transparent to opaque
formation of bubble (gas): electrolysis

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Q

indicators

A

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