Endothermic reactions<span>. An </span>endothermic reaction occurs <span>when the energy used to break the bonds in the reactants is greater than the energy given out when bonds are formed in the products. This means that overall the </span>reaction<span> takes in energy, therefore there is a temperature decrease in the surroundings.</span>
Compound A: Acetophenone
Compound B: Propyl Benzene
The mass spectrum for compound A has a base peak at m/z = 105 which is for benzylidyneoxonium ion, and Compound B has a stable peak at m/z = 91 which is for Benzylium cation and rearranges to tropyllium cation and giving a peak at m/z at 91. And both compound A and B when treated with chromic acid produces Benzoic Acid.
Answer: SMALLEST is lithium
LARGEST is Fluorine
Explanation:
Answer:
Atomic radius of sodium = 227 pm
Atomic radius of potassium = 280 pm
Explanation:
Atomic radii trend along group:
As we move down the group atomic radii increased with increase of atomic number. The addition of electron in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased.
Consider the example of sodium and potassium.
Sodium is present above the potassium with in same group i.e, group one.
The atomic number of sodium is 11 and potassium 19.
So potassium will have larger atomic radius as compared to sodium.
Atomic radius of sodium = 227 pm
Atomic radius of potassium = 280 pm
Answer:
See explanation.
Explanation:
Hello,
In this case, for the described chemical reaction:
2 HCl(aq) + Mg(OH)2(aq) → MgCl2(aq) + 2 H2O(l)
We can notice there is a 2:1 molar ratio between the moles of hydrochloric acid and magnesium hydroxide, therefore, at the equivalence point:
And in terms of volumes and concentrations we verify:
So we use the given data to proof it:
Therefore, we can conclude the data is wrong by means of the 2:1 mole ratio that for sure was not taken into account. This is also supported by the fact that normalities are actually the same, but the nomality of magnesium hydroxide is the half of the hydrochloric acid normality since the acid is monoprotic and the base has two hydroxyl ions.
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