9.
force is a quantity that is measured using the standard metric unit known as the

a. m/s
b. meter
c. newton
d. joule

Newton is the unit of the force in standard metric.  

Option: C

Explanation:

The physical quantity which has both direction and magnitude is force. Force is also known as to be a pull or push of an object with respect to its mass that is responsible for the change in velocity (acceleration). To give motion for an object from one place to another force is to be applied on an object.

So, Force= mass x acceleration = kg x = Newton (N)

Symbolically Newton is represented as N.

  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

it has to be b, about 97 percent.