What experimental evidence led to the development of this atomic model from the one before it?
Scientists have changed the model of the atom as they
have gathered new evidence. One of the atomic models
is shown below.
O A few of the positive particles aimed at a gold foil
seemed to bounce back.
O The colors of light emitted from heated atoms had
very specific energies.
O Experiments with water vapor showed that elements
combine in specific proportions.
O Cathode rays were bent in the same way whenever a
magnet was brought near them.

b) phosphorus pentoxide

  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

where are the vectors ?

laticia draws the diagram below to show earth’s magnetic field.

answer

the arrows to the right of earth should point up.