When the bottom of a pan of water is heated and the water expands becoming less dense than the surrounding water, it is forced upward. as it rises the water cools and sinks back to the bottom of the pan. This process is called what

gas

explanation:

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answer: e.   sour taste

explanation: acids are those substances which dissociates in water to give ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. acids are sour in taste. example: hcl

bases are those substances which dissociates in water to give ions or accepts ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. bases are bitter in taste. bases are slippery in nature.