Answer: The value of is 0.0012 M and is .
Explanation:
pH is the negative logarithm of concentration of hydrogen ion.
It is given that pH is 2.89. So, the value of concentration of hydrogen ions is calculated as follows.
The relation between pH and pOH value is as follows.
pH + pOH = 14
0.0012 + pOH = 14
pOH = 14 - 0.0012 = 13.99
Now, pOH is the negative logarithm of concentration of hydroxide ions.
Hence, is calculated as follows.
Thus, we can conclude that the value of is 0.0012 M and is .
The first one shows greater amplitude because there is more space between the waves. The amplitude of a wave refers to the maximum amount of displacement of a particle on the medium from its rest position. In a sense, the amplitude is the distance from rest to crest. Similarly, the amplitude can be measured from the rest position to the trough position.
Answer:
Explanation:
The chlorine is present in group 17. It has seven valance electrons. It accept one electron to complete the octet and show -1 charge and from anion.
Cl⁻
Sodium is present in group one. It alkali metal. It loses one valance electron and show +1 charge. It form sodium cation.
Na⁺
Magnesium is present in group two. It loses its two valance electrons and show +2 charge. It form magnesium cation.
Mg⁺²
Oxygen is present in group 16. It has six valance electrons. It require two electrons to complete the octet and show -2 charge.
O⁻²
Aluminium is present in group 13. it has three valance electrons. It loses its three valance electrons and show +3 oxidation state
Al⁺³ (most common)
others = Al⁺¹, Al⁺²
Iron is present on group eight.
Fe⁺² , Fe⁺³ (most common)
others = Fe⁺⁴, Fe⁺⁵
Copper is present in group eleven.
Cu⁺¹ Cu⁺²
other = Cu⁺³
Zinc is present in group twelve. -2, 0, +1 , +2
Zn⁻², Zn⁺¹, Zn⁺²
Answer:
<h2>2.709 × 10²⁴ molecules</h2>
Explanation:
The number of molecules can be found by using the formula
N = n × L
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
N = 4.5 × 6.02 × 10²³
We have the final answer as
<h3>2.709 × 10²⁴ molecules</h3>
Hope this helps you
Answer:
A) The shared electrons in C-O bonds spend less time close to the carbon nucleus than the shared electrons in C-H bonds.
Explanation:
The electronegativity from H is 2.2, from C is 2.55 and from O is 3.44. This property is the measure of the attractive force between an atom and a pair of electrons.
So, the difference of electronegativity of H and C is smaller than the difference between O and C. Because oxygen is more electronegative, the electrons stay close to it in the bond C=O. So carbon has a partial positive charge in that bond. For the bond C-H, the shared electrons stay closes to carbon.