Answer: When an iron nail immersed in the solution of copper sulphate than iron displaces copper from the solution of copper sulphate because iron is more reactive than copper. Therefore copper sulphate solution colour changes from blue to pale green.
Answer:
Atom has the tendency to attain stable electronic configuration of the nearest noble gas in accordance with the duplet and octet rule.hence,when an atom gains electron it becomes negatively charged and that is its negative charge making it an anion
Answer:
A. Changing water from liquid to solid is an example of a physical change
Explanation:
Answer: A Ruler
Explanation:A Ruler is a common instrument used for measuring the length of small objects. It usually has four units of measurement to choose from: millimeter, centimeter, inch, and foot.