Answers
Answer:
D.All chemicals are potentially dangerous
Explanation:
No chemical is toxicologically neutral
Related Questions
In compliance with conservation of energy, Einstein explained that in the photoelectric effect, the energy of a photon (hv) absorbed by a metal is the sum of the work function (Φ), the minimum energy needed to dislodge an electron from the metal’s surface, and the kinetic energy (Ek) of the electron: hv = Φ + Ek. When light of wavelength 358.1 nm falls on the surface of potassium metal, the speed (u) of the dislodged electron is 6.40 x 10⁵ m7s. (a) What is Ek (½mu²) of the dislodged electron? (b) What is Φ (in J) of potassium?
Please match word and definition < electrons and electric current move easily 1. electric current < Prevents electrons from moving 2. insulator flow of an electrical charge in a circuit 3. electric circuit 4. conductor provides a path for electrons to flow
Be sure to answer all parts. (a) How many atoms are directly bonded to the central atom in a trigonal planar molecule? i. two ii. three iii. six iv. eight (b) How many atoms are directly bonded to the central atom in a trigonal bipyramidal molecule? i. three ii. four iii. five iv. six (c) How many atoms are directly bonded to the central atom in an octahedral molecule? i. three ii. four iii. six iv. eight
Develop expressions for the mole fraction of reacting species functions of the reaction coordinate for: A system initially containing 2 mol NH3 and 5 mol O2 and undergoing the reaction: 4NH3 (g) + 5O2 (g) ® 4NO (g) + 6 H20 (g) A system initially containing 3 mol NO2, 4 mol NH3, and 1 mol N2 and undergoing the reaction: 6NO2 (g) + 8NH3 (g) ® 7N2 (g) +12H2O (g)
Answers
The chemical reaction has been the low energy reaction containing electrons rearrangement, while nuclear reactions have been the higher energy reactions with change in nuclei.
What are nuclear reactions ?
The term nuclear reactions is defined as when there has been the including the change in the nuclei of the atom. However, the reaction has been known as the chemical reaction when the change has been processed in the electrons with the rearrangement.
The nuclear reactions have made up of a more amount of energy to be liberated, while the amount of energy included in the chemical reaction has been smaller.
Thus, the chemical reaction has been the low energy reaction including electrons rearrangement, while nuclear reactions have been the high energy reactions with change in nuclei.
For more information about the nuclear reactions, refer to the link:
#SPJ2
Answers
The theoretical yield : = 10.251 g
Further explanation
Given
Reaction
3H₂(g)+N₂(g)→2NH₃(g)
1.81 g H₂
10.2 g N₂
2.19 g NH₃
Required
The theoretical yield
Solution
Find limiting reactant :
H₂ : 1.81 g : 2 g/mol = 0.905 mol
N₂ : 10.2 g : 28 g/mol = 0.364 mol
mol : coefficient
H₂ = 0.905 : 3 = 0.302
N₂ = 0.364 : 1 = 0.364
H₂ as a limiting reactant(smaller ratio)
Moles NH₃ based on H₂, so mol NH₃ :
= 2/3 x mol H₂
= 2/3 x 0.905
=0.603
Mass NH₃ :
= mol x MW
=0.603 x 17 g/mol
= 10.251 g
Answers
Answer:
Esterification reaction
Explanation:
When we have to go from an acid to an ester we can use the esterification reaction. On this reaction, an alcohol reacts with a carboxylic acid on acid medium to produce an ester and water. (See figure).
In this case, we need the methyl ester, therefore we have to choose the appropriate alcohol, so we have to use the methanol as reactive if we have to produce the methyl ester.
Answers
Answer:
2.90
Explanation:
Any buffer system can be described with the reaction:
Where is the acid and
is the base. Additionally, the calculation of the pH of any buffer system can be made with the Henderson-Hasselbach equation:
With all this in mind, we can write the reaction for our buffer system:
In this case, the acid is with a concentration of 0.413 M and the base is
with a concentration of 0.237 M. We can calculate the pKa value if we do the "-Log Ka", so:
Now, we can plug the values into the Henderson-Hasselbach
The pH value would be 2.90
I hope it helps!
(B) effect of a magnetic field on nucleus spin
(C) masses of the atoms involved in the bond
(D) the type of vibration being observed
Answers
Answer:
The factors that govern the position of an IR absorption peak are:
(A) strength of the bond
(C) masses of the atoms involved in the bond
(D) the type of vibration being observed
Explanation:
In infrared spectroscopy the molecules absorb the frequencies that are characteristic of their structure. These absorptions occur at resonance frequencies, that is, the frequency of the absorbed radiation coincides with the frequency of vibration. The energies are affected by the shape of molecular potential energy surfaces, the masses of atoms and the associated vibronic coupling. The resonance frequencies are also related to the strength of the bond and the mass of the atoms at each end of it. Therefore, the frequency of vibrations is associated with a particular normal movement mode and a particular type of link.
Answers
The reactions that would have the smallest value of K is
A + B → 2 C; E°cell = -0.030 V
Option A
Generally the equation for the number of electrons transferred is mathematically given as
where
T= Temperature
F=25C(298K)
R = Gas constant
R= 8.314 J/K.mol
F = Faraday's constant
F= 96500 C
We see from the equation that the E-cell is directly proportional to K(equilibrium constant of the reaction)
Hence, The reactions that would have the smallest value of K is
A + B → 2 C; E°cell = -0.030 V
For more information on Reaction
Answer:
The reaction with smallest value of K is :
A + B → 2 C; E°cell = -0.030 V
Explanation:
where :
n = number of electrons transferred
F = Faraday's constant = 96500 C
= standard electrode potential of the cell
R = Gas constant = 8.314 J/K.mol
T = temperature of the reaction =
= equilibrium constant of the reaction
As we cans see, that standard electrode potential of the cell is directly linked to the equilibrium constant of the reaction.
- Higher
higher will be the value of K.
- Lower
So, the reaction with smallest value of electrode potential will have smallest value of equilibrium constant. And that reaction is:
A + B → 2 C;