Answer:
it's a chemical change
Explanation:
When two different chemical substances are mixed they are no longer the same and can not be changed back so therefore it's a Chemical reaction.
1) Chemical equation
Cu + 2AgNO3 ---> Cu (NO3)2 + 2Ag
2) molar ratios
1 mol Cu: 2 moles AgNO3 : 1 mol Cu (NO3)2 : 2 mol Ag
3) Convert 12. 83 * 10^23 atoms of Cu in moles
12.83 * 10 ^ 23 atoms / (6.02 * 10^23 atoms / mol) = 2.131 mol Cu
4) Use the proportions
2.131 mol Cu * 2 mol Ag / 1 mol Cu = 4.262 mol Ag
5) Use the atomic mass of silver to convert 4.262 mol in grams
mass = number of moles * atomic mass = 4.262 mol * 107.9 g / mol = 459.9 grams
Answer: 459.9 g
Answer:
true
Explanation:
drought is a period of unusually persistent dry weather that persists long enough to cause serious problems such as crop damage and/or water supply shortages. The severity of the drought depends upon the degree of moisture deficiency, the duration, and the size of the affected area.
It depends on what is is mixed on
Answer:
4687.5 mL
Explanation:
Given that the density of the substance = 8.96 g/mL
Mass = 42.0 kg
The conversion of kg into g is shown below as:
1 kg = 1000 g
So, mass = 42.0 × 1000 g = 42000 g
Volume = ?
So, volume:
The volume of the 42.0 kg of the substance = 4687.5 mL