Answer:
4. Option C. Pentane.
5. Option D.
Explanation:
4. Hydrocarbons are compound containing carbon and hydrogen only. Hydrocarbons are said to be saturated when they contain only carbon to carbon single bond. All alkanes are saturated hydrocarbon.
The correct answer is pentane.
5. Isomerism is the phenomenon whereby two or more compounds have the same molecular formula but different structural patterns. The compounds involved are called isomers.
A careful observation of the diagram above shows that only option D satisfied the definition of Isomerism as the two compound both have the same molecular formula as C3H8O but different structural patterns.
Note: option C does not contain isomers as Isomerism can not occur in a compound having just 1 carbon atom.
Answer:
D.) The nuclear model describes the atom as a dense, positive nucleus surrounded by a cloud of negative electrons.
Base on my research and further investigation about the said problem, the possbile answer would be this one.
<span>1. calculate the g of PbO in the 272 g lead crystal (19% PbO)
272 g x 19 /100 = xxx g PbO
xxx g PbO/molecular mass of PbO = moles PbO
2. write and balance the equation of neutralization of PbO and sodium sulfide.
PbO + sodium sulfide -> sodium oxide + lead sulfide
3. Calculate the moles of sodium sulfide that will react with the moles of PbO
4. Convert the moles of sodium sulfide to g of sodium sulfide</span>
First step is to balance the amount of atoms on each side
So for example if my equation that I have to balance is : Br2 -> Br-
First thing I would have to do would be :
Br2 -> 2Br-
Then I would have to balance the charges on both sides. So because there is a -2 charge on the right side I will have to add a -2 charge onto the right side as well. I would do this by :
Br2 + 2e- -> 2Br-
And now you can see the amount of atoms and the charges are balanced... So your overall reaction is now balanced too.
