Answer:
B) Melting of a solid.
Explanation:
- Kindly, see the attached image.
- It is known that the substance has different 3 phases (solid, liquid, and gas).
- By heating, the substance converted from solid phase to liquid phase passing by a plateau that represents equilibrium between the two phases.
- By further heating, the solid completely converted into liquid phase, then converted to gaseous phase passing by a plateau that represents an equilibrium between the liquid an gaseous phase.
<em>The plateau at the lower temperature represent: B) Melting of a solid.</em>
Neutrons keep the Protons "in check", meaning Protons hold a very strong repulsive positive charge. The Neutrons counteract the repulsive force within a small space to keep the Nucleus stable.
I hope this helps! :)
Answer:
3
Explanation:
From the question:
Barium phosphate reacts with sulfuric acid to form barium sulfate and phosphoric acid.
The equation for the above reaction can be written as follow:
Ba3(PO4)2 + H2SO4 —> BaSO4 + H3PO4
Now, let us balance the equation in order to obtain the coefficient of H2SO4. This is illustrated below below:
Ba3(PO4)2 + H2SO4 —> BaSO4 + H3PO4
There are 3 atoms of Ba on the left side of the equation and 1 atom on the right side. It can be balance by putting 3 in front of BaSO4 as shown below:
Ba3(PO4)2 + H2SO4 —> 3BaSO4 + H3PO4
There are 3 atoms of SO4 on the right side and 1 atom on the left side. It can be balance by putting 3 in front of H2SO4 as shown below:
Ba3(PO4)2 + 3H2SO4 —> 3BaSO4 + H3PO4
Now, we can see that there 6 atoms of H on the left side and 3 atoms on the right side. It can be balance by putting 2 in front of H3PO4 as shown below:
Ba3(PO4)2 + 3H2SO4 —> 3BaSO4 + 2H3PO4
Now the equation is balanced.
The coefficient of sulphuric acid (H2SO4) is 3
macroscopic means to be seen with the naked eye and microscopic means to be visible only with a microscope.
Answer: option a and d
Explanation:
Option A- Benzene undergoes substitution reaction
Example : benzene reacts with chlorine to form chlorobenzene, in the presence of Iron
(iii) chloride as a catalyst
C6H6 + Cl2 ---> C6H5Cl + HCl
Option D- Benzene also undergoes addition reaction
Example: benzene reacts with hydrogen , in the presence of nickel as a catalyst to form
cyclohexane
C6H6 + 3H2 ---> C6H12
Reasons why Option B isn't the answer
Although benzeme has degree of unsaturation but it's not five degree of unsaturation.
Benzene has 6 carbon atoms and 4 degrees of unsaturation (1 ring and 3 double
bonds).
If you work backwards and double the degrees of unsaturation you have 8 degrees of
unsaturation instead of 5.
Option C - Benzene isn't a saturated hydrocarbon
