7. Write the chemical equations in symbols and formula for ti following word equations.
a. Silver chloride
Silver + Chlorine
b. Magnesium + Oxygen
Magnesium oxide
c. Iron + Sulphur
Iron (II) sulphide
d. Carbon + Oxygen
Carbon dioxide
e. Calcium + Oxygen
Calcium oxide

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.

level 4 to level 2 : ))

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.