Answer : False, there will be two lithium and one oxygen atoms in a unit molecular structure of lithium oxide.
Explanation:
Electronic configuration of lithium is :
In order to attain stable electronic configuration it will loose an electron and form positively charge cation.
The electronic configuration of oxygen is:
Oxygen being second most electronegative atom requires two electrons to attain noble gas configuration stability and form negatively charge ion with 2- charge.:
When two atom of lithium and oxygen comes together , one electron from each lithium atom get transferred to an oxygen atom which results in formation of lithium oxide.
Answer:
Explanation:
The question must be restated because you can calculate ΔH₂ from the other reactions only if you know the global ΔH, ΔH₁, and ΔH₃.
As stated by Hess’s law, the overall change in the enthalpy, ΔH, of a reaction does not depend of the path followed. Thus, when you have a series of reactions, the net change from the first reaction to the last reaction is equal to the sum of the ΔH values for the individdual reactions:
If you name ΔH₄, the overal change in the enthalpy to convert 1 to 4, but ΔH₁, ΔH₂, and ΔH₃ are the changes of the intermediate reactions that transform 1 in 2, 2 in 3, and 3 in 4, respectively, then, you can write, accordingly to Hess's law, you can write:
Then, assuming you know ΔH₄, ΔH₁, and ΔH₃, you can calculate ΔH₂ clearing from the previous equation:
- ΔH₂ = ΔH₄ - (ΔH₁ + ΔH₃) ← answer
Answer:
frequency = velocity of light /wavelength
wavelength = velocity / frequency
=3 x10^8 / 5.9 x 10^11
=0.508 x 10^-3.
Answer:
To interpret a 13C-NMR spectrum we will use some standards very simple. A 13C-NMR spectrum gives us the following information:
1. Indicates the number of non-equivalent carbons in the molecule.
2. Measuring the chemical shift we can intuit the environment
electronic and determine the next functional groups.
3. In this case we cannot count on integration since the different
carbons have different relaxation times.
The number of peaks in the spectrum indicates the number of types of carbon present in the analyzed substance.
The factors that influence the chemical shift of the signals in the 13C NMR are:
- electronegativity of carbon bound groups
-
carbon hybridization
Explanation:
The nuclear magnetic resonance of C13 is complementary to that of H1. This technique is used to determine the magnetic environment of carbon atoms.
Answer: C. 1000 Newton
Explanation:
Given that :
Weight of moon rover on earth = 6000 newton
Approximate of moon rover on moon will be?
Weight of an object (W) = mass(m) × acceleration due to gravity(g)
To get the mass of moon rover(m) :
m = weight / acceleration due to gravity
g on earth = 9.8m/s²
Hence,
mass of moon rover = 6000/ 9.8
= 612.244kg
Surface gravity on the moon is about 1.6m/s²
Hence ;
Weight of moon rover on the moon :
Mass of moon rover × 1.6m/s²
= 612.244 × 1.6m/s²
= 979.59 Newton
= 1000 Newton (nearest thousand)