Answer is: 28 kJ.
Chemical reaction: A₂ + B₂ ⇄ 2AB.
Ea(forward) = 105 kJ/mol.
Ea(reverse) = 77 kJ/mol.
ΔH(reaction) = ?
<span>The enthalpy change of reaction is the change in the energy of the reactants to the products.
</span>ΔH(reaction) = Ea(forward) - Ea(reverse).
ΔH(reaction) = 105 kJ/mol - 77 kJ/mol.
ΔH(reaction) = 28 kJ/mol; this is endothermic reaction (ΔH <span>> 0).</span>
Explanation:
wavelength=speed of light/frequency
=(3×10^8)/2.99
=1.0033 × 10^8
Answer
Option D
When a grignard Reagent reacts with Ethylene Oxide... A Primary Alcohol is Formed.
CH2OCH2 + RMgX ==> RCH2CH2OMgX
When You Hydrolyze
You have
RCH2CH2OH
The Text written below may come in handy someday.
Hope you find it helpful.
One of the preparation of Alcohols is via Reaction with "Grignard Reagents" .
Grignard Reagents have the formula "RMgX"
Where R is an alkyl group eg CH₃, C₂H₅ etc
X is a halogen eg Cl,Br etc
Ethylmagnesiumbromide fits the description of grignard Reagent from what I wrote above.
The formula for Ethylmagnesiumbromide is
"C₂H₅MgBr"
Now
When grignard reagents react with Alkanals... They form alcohols.
Note this trend.
When a grignard reagent reacts with Methanal(Formaldehyde)... It forms a Primary Alcohol.
When a grignard reagent reacts with any other Alkanal besides Methanal(formaldehyde) ... it forms Secondary Alcohols.
Answer:
b. Mg & Cl
a. transferred
46
Explanation:
Ionic bonds form between metals and non-metals when electrons are transferred from one specie to another.
- The electrostatic attraction from the resulting ions forms the ionic bonds.
- A metal is electropositive and will readily donate electrons
- A non-metal is electronegative and will accept electrons.
- This creates two oppositely charge ions that attracts by means of ionic bonding.
Since Mg and Cl are the only metal - non-metal pair, and ionic bond will form between them.
2.
In the specie;
₄₇Ag¹⁺
47 is the atomic number of the element Ag.
The atomic number is the number of protons in an atom. For a specie in neutral state, the number of protons and electrons are the same.
- When an atom loses electron, it becomes positively charged.
- Here Ag has lost one electron and then, the number of electrons becomes 46.
- The number of protons is still 47
Are there any choices? Because from what the question is it seems like we need choices to help