1. Johan started attending swimming lessons. On the first day, he
suffered from pain on his body as he had used a wrong technique to
jump into the water . Explain the reason for Johan's
injury. (Relate to water surface tension).

14. complete and balance the equations for the single displacement reactions. a. zn + pb(no3)2 -> b. al + niso4 -> 15. complete and balance the equations for the double displacement reactions. a. agno3(aq) + nacl(aq) -> b. mg(no3)2(aq) + koh(aq) -> 16. complete and balance the equations for the combustion reactions. a. __ ch4 + o2 -> b. __ c3h6 + o2 -> c. + o2 ->

Explain which group an element with the electron configuration 1s2 2s2 2p6 3s2 3p6 3d1 4s2 belongs to.

What are the chemical names of these compounds? ke: mg3n2: reset next