The answer to the question what is true about the location of Polaris in the azimuth-altitude coordinate system, it is the letter "C" which is "Its altitude depends on the observer's altitude." For example, if the observer is in the equator, observer's altitude is zero and then the Polaris altitude is also zero.
Unsaturation (IHD) 2 hydrogen Needed
IHD = [(2n+2) -H]/2
(H: X=1, N=-1, O= zero)
Unsaturation:
Double bonds = 1
Rings = 1
Triple Bonds = 2
The degrees of unsaturation in a molecule are additive — a
molecule with one double bond has one degree of unsaturation, a molecule with
two double bonds has two degrees of unsaturation, and so forth.
Answer:
a) Ionic
Explanation:
Natural and artificial compounds can be formed from two or more metals.
If the difference in electronegativity between the metals is very large, these compounds may be bonded by a mixture of chemical bonds. Those can be metallic bonds and other types of bonds.
According to the electronegativity difference between two components, if it is equal or higher than 1.7 they are classified as ionic bonding. In this sense, if we have two metals with a very large difference of electronegativity. Let's suppose higher than 1.7, they will form an ionic bonding.
Finally, Answer is a) Ionic bonding when the difference in electronegativity is very large.
Answer:
-176.0 kJ/mol
Explanation:
Let's consider the following balanced reaction.
NH₃(g) + HCl(g) → NH₄Cl(s)
We can calculate the standard enthalpy change for the reaction (ΔH°rxn) using the following expression.
ΔH°rxn = 1 mol × ΔH°f(NH₄Cl(s)) - 1 mol × ΔH°f(NH₃(g)) - 1 mol × ΔH°f(HCl(g))
ΔH°rxn = 1 mol × (-314.4 kJ/mol) - 1 mol × (-46.1 kJ/mol) - 1 mol × (-92.3 kJ/mol)
ΔH°rxn = -176.0 kJ/mol
