only for correct answer NEED CORRECT ANSWER ASAPPP for each question

4. Which of the following is the best example of diffraction?
a. Your voice echoing back when you shout into a canyon
b. A straw appearing to bend when you place it in a glass of water
C. A prism breaking a beam of light into its component colors
d. The music on your stereo getting louder when you turn up the volume

5. What is the main difference between refraction and diffraction?
a. Refraction is a phenomenon that affects light; diffraction is a phenomenon that affects
sound.
b. Refraction involves the bending of light; diffraction involves the bending and spreading
of light, usually around an obstacle.
c. Refraction usually happens in the atmosphere; diffraction usually happens closer to the
earth's surface.
d. Refraction involves changes to the density of light; diffraction involves changes to the
speed of light.

I think the answer is C. for 4. and then B. for 5.

  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

a straight line sloped