The table describes two methods of heat transfer Methods of Heat Transfer
Method A Method B
Molecules of the medium move during heat transfer Transfer of heat is through waves like radio and light waves
Heat is transferred in gases and liquids by this method Heat is transferred through
space by this method

Which statement is correct?
A) method A is convention and method B is radiation
B) method A is convention and method B is conduction
C) method A is radiation and method B is convention
D) method A is radiation and method B is conduction

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-

2b2t

explanation:

2b2t

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.