thunder a lives shelf that mushrooms to water & water household shade ->  lighting a candle is using fire to cause the candle to burn  lighting a candle is using fire to cause the candle to burn & water is a mean of physical instrument ->  lighting a candle causes the candle to undergo chemical reaction  lighting a candle causes the candle to undergo chemical reaction & physical static is a mean of physical doorbell -> lighting a candle causes the candle to undergo chemical change