It is because black absorbs heat whereas white reflects heat
Answer:
Using dimensional analysis, we have....
4.515x1024 atoms x 1 mole/6.022x1023 atoms = 7.4975 moles = 7.498 moles of PD
So the official answer is 7.5
Explanation:
"Purellium Distinkamide" is a silly joke name for a made-up compound. The idea of this question is that no matter what the substance we are talking about is - water (H2O), hydrogen gas (H2), or even "Purellium Distinkamide" - a mole is always the same number of molecules, 6.022 x 1023. This is Avogadro's number and you have probably seen it around class a lot!
Answer:
c.
Explanation:
An Arrhenius acid increases the number of H+ ions in solution. They are the only positive ions in the solution.
Answer:
Boron has a larger radius and the protons in carbon exert more pull.
Explanation:
Remember than elements have greater radius as they are closer to the bottom left corner, so boron would have the larger radius here. Carbon has a smaller radius, which makes it easier for the protons in carbon to exert more pull.
Answer:
The student conclude that the sample of benzoic acid is impure.
Explanation:
The observed melting point of benzoic acid when a student melts his/her sample is low than the actual value. The reason for this might be:
(a) <u>The most probable reason is that the sample is impure. Impurities in the sample leads to lowering the value of the melting point.</u> The reason for the phenomenon is that when impurity is present in the compound, the pattern of the crystal lattice disturbs and thus it less amount of heat is require to break the lattice.
(b) There may be some experimental errors like:
- Non-uniform heating of the sample
- The sample is not tightly filled in the capillary if the student is following Kjeldahl's flask method.
- If the student is using melting point machine, there there might be some instrumental errors.
<u>The student conclude that the sample is impure.</u>