A compass needle points north because the north pole of the magnet inside it is attracted to the south pole of Earth's built-in magnet . <u><em>And irons are heavily attracked to magnet</em></u> .So this is why iron needles used in compasses .
Answer:
4.5
Explanation:
option c
as catalyst increases the reaction while activation energy is inversely proportional to rate of reaction, so option c is correct
Molar mass of CaO
(40 + 16)g
= 56g
hope it helps you
A.................. I think the answer