$1.$ A cylinder contains a mixture of hydrogen $($H$2)$ and of chlorine $($Cl$2).$ Compare, without doing any calculations, using words, such as: same, different, higher, lower, greater, and lesser. $(8$ points$)$

a$.$ The relative mass of the molecules $($consult a periodic table$).$

H $1\mathrm{.}00784$ x $2=2\mathrm{.}01568($H$2)$

Cl $35\mathrm{.}453$ x $2=70\mathrm{.}906($Cl$2)$

Therefore, Cl has a greater relative mass

b$.$ The temperature of each gas;

H $20$C HIGHER

Cl $0$C LOWER

Therefore, H has a higher temperature than Cl

c$.$ The average kinetic energy of the molecules;

d$.$ The average speed of the molecules. Different