If one's hands are being warmed by holding them to one side of a flame, the predominant form of heat transfer is what process?
a. conduction
b. radiation
c. convection
d. vaporization

b. radiation

Explanation:

The correct choice is

b. radiation

Radiation is the process of heat transfer where no medium is required. Air is present between hands and flame and thermal conductivity of air is very low.

The hands are not in direct contact with the flame, hence conduction process of heat transfer is not possible.

In convection process of heat transfer, we have the warmer part of the medium moving towards the colder part. hence the convection is also not responsible for transfer of heat in this scenario

  1.the balanced   chemical equation is as below

cu +   2 ag(no)₃ → cu(no₃)₂   +2 ag

2.the   much silver   produced   is   50.9 g

step 1: find the   moles of cu

moles =   mass÷   molar mass

  from periodic table the molar mass of cu = 63.5 g/mol

moles is therefore = 15.00 g÷ 63.5 g/mol = 0.236   moles

step 2: use the mole ratio to determine the   moles of ag

from equation above   cu: ag   is 1: 2

therefore the moles of ag   =0.236   moles   x 2/1 =0.472   moles

step 3: find the mass   of ag

mass = moles x molar mass

from periodic table   the molar mass of ag =107.87 g/mol

mass   = 0.472   moles x 107.87 g/mol = 50.9 g

3.   the   much   silver   collected worth is   1.797 oz

  convert   50.9 g   to oz

that is   1 gram = 0.0353 oz

          50.9 grams =?   oz

by cross multiplication

={(50.9 grams x 0.0353 oz) / 1   gram}   =1.797 oz

this means that the temperature of both substances will be equal