Fill in the following blanks with suitable words :
(a) Acids have a pH ___ than 7.
(b) Alkalis have a pH ___ than 7.
(c) Neutral substances have a pH of __
(d) The more acidic a solution, the ___ the pH.
(e) The more alkaline a solution, the ___ the pH.
Fill in the following blanks with suitable words: (a) A current is a flow of ... For this to happen there must be a ...circuit. (b) Current is measured in .... using an ..... placed in .... in a circuit.