David decides to build an electromagnet to pick up the box of tacks he dropped on the floor. He did everything just like his teacher did in class with a D-cell battery, wire and nail But since he did not have any iron nails, he used a plastic nail from his baby brother's toy workbench to wrap the wire around. Which of
the following explains what happened when David hooked up the wire to the battery.
the electromagnet worked better when he hooked up a 9 von battery to replace the battery
the electromagnet did not work because the plastic nail acted as an insulator
the electromagnet did not work because the plastic nail allowed fewer cols in the electromagnet.
the electromagnet worked perfectly picking up all the tacks David dropped.

  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

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle