Answer:
Option B.
Explanation:
- 2Pb(NO₃)₂ → 2PbO + 4NO₂ + O₂
First we <u>convert 9.90 g of Pb(NO₃)₂ into moles</u>, using its molar mass:
- 9.90 g ÷ 331.2 g/mol = 0.0299 mol Pb(NO₃)₂
Then we<u> convert moles of Pb(NO₃)₂ into moles of PbO</u>, using the stoichiometric coefficients:
- 0.0299 mol Pb(NO₃)₂ *
= 0.0299 mol PbO
Now we<u> convert 0.0299 mol PbO into grams</u>, using its molar mass:
- 0.0299 mol PbO * 223.2 g/mol = 6.67 g PbO
So <em>6.67 g is the theoretical yield</em>. With that in mind <u>we calculate the percent yield</u>:
- % yield = 5.51 / 6.67 * 100 % = 82.6%
So the correct answer is option B.
<h2>Answer:</h2>
The transferred energy by the energy will be converted into the kinetic energy of molecules. Which allow them to move more fastly then in solid.
<h3>Explanation:</h3>
In solid, molecule are moving but their motion is vibrational motion. They don't change their position. It means their kinetic energy is that much low to let them move freely.
But in case of liquid, molecules have much energy to move freely in the matter. Their bonds don't break, so the will be in liquid form.
This increase in kinetic energy is due to energy given by the internee.
Answer:
It is a neutral atom and does not carry a charge
Hello!
The answer is C. Hibernate during the cold winter months.
Why?
Alpine marmots are known for having a long hibernation duration which starts in October (winther) and ends in April (summer) (about 7 months). During this long period, they are able to reduce their bear beats from 200 per minute to just 30 or 38 beats, and their breaths from 60 breaths/minute to 1-3 breaths/minute, guaranteeing an extreme energy saving process.
Have a nice day!
Answer:
True
Explanation:
Yes.
The distance that the molecules move depends on their solubility in the solvent and the size of the molecules. Heavy molecules will travel slower and therefore travel a shorter distance in the time the chromatography is run.
We know from such things as felt tip pens that colourings can be soluble in different solvents. Water soluble felt pens have colours that are - well - water soluble. Permanent felt pens have colours that are insoluble in water but that are soluble in another solvent. This could well be alcohol.
The water soluble colours may also be soluble in alcohol. The solubility in alcohol will be different from the solubility in alcohol, and so the Rf value ( the distance travelled) will also be different.
Because of the complicated shapes of the colours, the colours may not have the same order in the Rf values in the different solvents.