Nitrogen has an average atomic mass of 14.00674. it has two isotopes, n-14 and n-15, with atomic masses of 14.0031 amu and 15.001 amu, respectively. what is the abundance of n-15?
What quantity is represented by the metric system prefix deci-
3.01 Quiz: Atomic Number and the Periodic Law ps
Which of the following characteristics was not included in Dmitri Mendeleev's periodic table?
distribution of elements determined by electron configuration
What is the primary atomic characteristic that Mendeleev used to organize the periodic table?
Mendeleev left several blank spaces in his original periodic table. What did those spaces represent?
elements that had yet to be discovered
According to the periodic law, what is the relationship between elements and periods?
Element properties repeat from period to period.
Which of these sets of elements has similar properties? Consult the periodic table.
strontium, magnesium, calcium, beryllium
The answer is Dissemination of components controlled by electron design.
the Aufbau rule, the Pauli rejection guideline, and Hund's rule,tell you how to discover the electron designs of particles. As indicated by the aufbau standard, electrons possess the orbitals of most reduced vitality first, Pauli-prohibition rule, and Hund's Rule. The electronic setup of cations is doled out by evacuating electrons first in the peripheral p orbital, trailed by the s orbital lastly the d orbitals.
Cola has a ph of 3.5. this means that it has an excess of _______ ions and would be called a(n)________.
Answer: hydrogen ions , acid
pH or pOH is the measure of acidity or alkalinity of a solution.
pH is calculated by taking negative logarithm of hydrogen ion concentration.
Acids have pH ranging from 1 to 6.9, bases have pH ranging from 7.1 to 14 and neutral solutions have pH equal to 7.
Thus as pH is less than 7, the solution is acidic.
How do unbalanced forces affect its motion when the object is at rest?
Ethyl chloride (c2h5cl) boils at 12∘c. when liquid c2h5cl under pressure is sprayed on a room-temperature (25∘c) surface in air, the surface is cooled considerably. part a what does this observation tell us about the enthalpy of c2h5cl(g) as compared with c2h5cl(l)?
Since the surface where the liquid was sprayed cooled instantly, therefore we can say that some heat must be absorbed by the liquid to make that surface cooler. So since heat was absorbed by the liquid to become gas, hence the enthalpy of the C2H5Cl (g) is higher compared to C2H5Cl (l)
If a buffer solution is 0.250 M 0.250 M in a weak base ( K b = 8.0 × 10 − 5 ) Kb=8.0×10−5) and 0.540 M 0.540 M in its conjugate acid, what is the pH ?
Considering the Henderson- Hasselbalch equation for the calculation of the pOH of the basic buffer solution as:
pH + pOH = 14
So, pH = 14 - 4.43 = 9.57
What are similarities between Crystals and Polymer's. Please Help?!
There is little similarity between crystals and amorphous polymers.
However, many polymers (e. g, linear polyethylene, nylon, and Kevlar) are highly crystalline.
Thus, molecular crystals (e.g. dry ice, ice) and crystalline polymers share some similarities.
In both, the molecules are
• arranged in a regular repeating pattern
• bonded to each other by London dispersion forces
• poor conductors of heat and electricity
What are devices that move atomic nuclei at extremely high speeds