D- If there is a color change that is indicative to that being a chemical change.
A, B, and C are examples of physical changes.
Cells have limitations, if the cell is stronger it targets other cells , when a cell is weak it possibly mean it’s disease.
<span>1. Balance the reaction
Cu + 2AgNO3 → Cu(NO3)2 + 2Ag
2. Find the limiting [divide moles of reactant by their balancing numbers]
Cu: 4.2/1 =4.2
AgNO3: 6.3/2= 3.15
AGNO3 is the limiting
How many moles of silver metal will be formed?
The ratio between the limiting reactant and silver is 2:2 or 1:1
therefore 6.3 moles of silver will be formed.
How many moles of excess reactant will be left?
Since each mole of copper is equal to 2 moles of AgNO3. divide 6.3 by 2 then minus it from coppers moles
6.3/2 = 3.15
4.2-3.15 = 1.05 moles of copper will be left
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Remember the fact
Randomness follows the order
#System A
As solid particles are dissolved in water their randomness increases so entropy increases
#System B
Gas is converted to liquid so entropy decreases as randomness decreases
