Given the Planck's constant and the speed of light, the energy of the ultraviolet light with a frequency of 9.58×10¹⁴ Hz is 6.35×10¯¹⁹ J (Option C)
Data obtained from the question Planck's constant (h) = 6.626×10¯³⁴ JsSpeed of light (v) = 3×10⁸ m/sFrequency (f) = 9.58×10¹⁴ HzEnergy (E) =? How to determine the energyThe energy of the ultraviolet light can be obtained as follow:
E = hf
E = 6.626×10¯³⁴ × 9.58×10¹⁴
E = 6.35×10¯¹⁹ J
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The ________________and ______________ of magma cause igneous rocks to form.
A: melting and cooling
B: cementation and compaction
C: weathering and erosion
D: heat and pressure
Answer:
option B
cementation and compaction
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You compare the gas generated from a reaction using two antacid tablets with the gas generated from a reaction using four antacid tablets (consider the antacid as the limiting reagent).
At constant pressure and temperature, how do the volumes of the gases compare?
The two reactions produce the same amount of gas.
The gas generated by four antacid tablets has a smaller volume.
The gas generated by two antacid tablets has a smaller volume.
Answer: The gas generated by two antacid tablets has a smaller volume.
Explanation:
Since the antiacid is the limiting reagent, we know that the more tablets there are, the more gas there will be.
This means that there will be more gas generated by the four antiacid tablets when compared to the two antiacid tablets, which gives us that the gas generated by the two antiacid tablets has a smaller volume.
In the following acid-base reaction,
HPO42- is the
H2PO4- (aq) + NH3(aq) → HPO42- (aq) + NH4+(aq)
А
B
С
acid
conjugate
acid
conjugate
base
Taking into account the Brønsted-Lowry acid-base theory, HPO₄⁻² is conjugate base of H₂PO₄⁻.
Brønsted-Lowry acid-base theoryThe Brønsted-Lowry acid-base theory (or the Brønsted-Lowry theory) identifies acids and bases based on whether the species accepts or donates protons or H⁺.
According to this theory, acids are proton donors while bases are proton acceptors.
So, reactions between acids and bases are H⁺ proton transfer reactions, causing the acid to form its conjugate base and the base to form its conjugated acid by exchanging a proton.
In other words, a conjugate base is an ion or molecule resulting from the acid that loses the proton, while a conjugate acid is an ion or molecule resulting from the base that gains the proton:
acid + base ⇄ conjugate base + conjugate acid
This caseIn this case, you know:
H₂PO₄⁻ + NH₃ → HPO₄⁻² + NH₄⁺
H₂PO₄⁻ behaves like acid because donates an H⁺ proton while NH₃ behaves like base because accepts an H⁺ proton from the acid.
So, NH₄⁺ is the conjugate acid of the NH₃ and HPO₄⁻² is conjugate base of H₂PO₄⁻.
In summary, HPO₄⁻² is conjugate base of H₂PO₄⁻.
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The density of chlorine gas at 0.970 atm and 29.8 °C is ________ g/L.
Answer:
d=3.95 g/l
Explanation:
1) Ideal gas equation:
pV = nRT
2) Transform the equation to compute density, d = m / V
n = mass in grams / molar mass = m / MM
pV = (m/MM) RT
=> pV = mRT/MM
=> m/V = pMM / (RT)
d = pMM / (RT)
p = 1.21 atm
MM = 83.80 g/mol (this is the atomic mass of krypton element)
T = 50 + 273.15 K = 323.15K
3) Compute:
d = (1.25 atm * 83.80 g/mol) / (0.0821 atm*liter /K*mol * 323.15K)
How many grams of oxygen gas are required to react completely with 2.8 g of solid sodium
in a synthesis reaction?
Explanation:
0.9 grams of oxygen gas we need.
Why is oxygen reduced in the reaction of hydrogen with oxygen to make water
Answer:
A. Oxygen pushes electrons towards the hydrogens.
Explanation:
The oxygen is reduced because it undergoes a partial gain of electrons. The oxygen atom in water has greater electron density near it than they did in the O₂ molecule.
What is Reduction Reaction ?
Reduction is a chemical reactions in which the number of electrons associated with an atom or a group of atoms is increased.
The electrons taken up by the substance reduced are supplied by another substance, which is thereby oxidized.
The hydrogen is oxidized because it added oxygen to form water.
Conversely the oxygen is reduced because it added hydrogen to form water.
Therefore, The oxygen is reduced because it undergoes a partial gain of electrons. The oxygen atom in water has greater electron density near it than they did in the O₂ molecule.
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Unwanted elements are removed from metals by a process called
a. mining
b. fission
c.refining
d. recycling
Answer:
C. Refining
Explanation:
Refining process removes elements from a substance
What is not a part of the digestive system
A. Large intestine
B. Small intestine
C.Trachea
D. Esophagus
Answer:
Trachea is not the part of digestive system
Explanation:
Trachea is the part of the respiratory system
Sodium hydroxide (0.400 mol) is allowed to react with an excess of sulfuric acid. How many moles of
sodium sulfate could be recovered from the products?
NaOH + H2SO4 → Na2SO4 + H20
Answer:
2 moles
Explanation:
In this reaction, the stoichiometry (mole ratio) is 1 mole of sulfuric acid reacting with 2 moles of sodium hydroxide (1:2 ratio)
2 Which of these rates of travel is slowest
a.5 kilometres per second
b.20 kilometres per minute
c.60 kilometres per hour
Answer:
60 kilometres per hour is the slowest rate of travel
Explanation:
we convert
20 kilometer per minute into kilometer per second
it comes out 1/3 kilometer per sec
Answer:
c
Explanation:
a- 5/1km per second
b-1/3km per second
c. 1/60km per second
the larger the denominator the smaller the fraction
Which one of these are a physical property? Select all that apply. a. Luster (shininess) Conducts Electricity Reactivity with water d. Temperature b. 0 0
the ability of atoms to attract electrons from surrounding atoms is called
Answer:
Electronegativity
Explanation:
The ability of an atom to attract itself an electron pair shared with another atom in a chemical bond.
Indicate the electron pair geometry and the molecular geometry for each of the six compounds.
Compound Electron pair geometry Molecular geometry
BeCl
2
linear
linear
SO
3
trigonal planar
trigonal planar
SO
2
trigonal planar
bent
SiCl
4
PF
3
SCl
2
A galvanic (voltaic) cell consists of an inert platinum electrode in a solution containing 1.0 M tin(IV) ion and 1.0 M tin(II) ion, and another inert platinum electrode in a solution containing 1.0 M cobalt(III) ion and 1.0 M cobalt(II) ion, connected by a salt bridge. Calculate the standard potential for this cell at 25°C. Standard reduction potentials can be found in the standard reduction potentials table.
In the galvanic or voltaic cell, the standard cell potential is 1.67 V. The standard potential is the difference between the reduction potential of cathode and anode.
What is an electrochemical cell?An electrochemical cell produces energy by a sponteanous chemical process. A galvanic or voltaic cell produces energy by a sponteanous chemical reaction.
Hence, given the standard reduction potentials;
Sn4+ + 2e- ==> Sn2+ Eº = 0.15 V (anode)
Co3+ + 2e- ==> Co2+ Eº = 1.82 V (cathode)
Eºcell = 1.82 V - 0.15 V = 1.67 V
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What is the thermodynamics equation?
please help. 15 points. will give brainliest.
Answer:
ΔU = Q − W
Explanation:
the branch of physical science that deals with the relations between heat and other forms of energy (such as mechanical, electrical, or chemical energy), and, by extension, of the relationships between all forms of energy.
ΔU is the change in internal energy U of the system. Q is the net heat transferred into the system—that is, Q is the sum of all heat transfer into and out of the system.
To what temperature must a sample of helium gas be cooled from 139ºC to reduce its volume from 3.1 L to 0.71 L at constant pressure?
Answer:
To what temperature must a sample of helium gas be cooled from 22.2 degrees C to reduce its volume from 1.00L to 100cm3 ?
Explanation:
what is the percent (mass/volume) if 22 g of kcl is added to 75 ml of water to make 83 ml of solution
Considering the definition of volume percentage, the mass/volume percent in this solution is 26.5%.
Definition of mass/volume percentMass/volume percent is a measure of concentration that indicates the number of grams of solute in each 100 mL of solution.
In other words, the volume percent of a component in the solution is defined as the ratio of the mass of solute that is present in a solution, relative to the volume of the solution, as a whole.
The volume percentage of a solution is determined by the following expression:
[tex]mass/volume percent=\frac{mass of solute}{volume of solution}100[/tex]
Mass/volume percent in the solutionIn this case, you know:
mass of solute= 22 gvolume of solution= 83 mLReplacing in the definition of mass/volume percent:
[tex]mass/volume percent=\frac{22 g}{83 mL}100[/tex]
Solving:
mass/volume percent= 26.5 %
Finally, the mass/volume percent in this solution is 26.5%.
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A 25 L tank of oxygen under a pressure of.80 atm would require what pressure to
decrease the volume to 1.0 L?
Answer:
20 atm
Explanation:
Use the equation P1 x V1 = P2 x V2.
1) Rearrange the equation with algebra to solve for P2.
P2 = (P1 x V1)/ V2
2) Plug in to the equation where V1 = 25L, P1 = 0.80 atm, and, V2 = 1 L
P2 = (25L x 0.80 atm)/ 1L
3) Solve: P2 = 20 atm
The pressure required to reduce the oxygen's volume to 1 L would be 20 atm.
Why do some animals migrate in and out of the coniferous forest? (select two) Food Cover Precipitation Temperature
Answer:Tep/Shel/
Explanation:
Answer:
it's food and procipitation
Explanation:
How do human population growth trends differ between developed nations and developing nations?
Answer:
Growing population
The worlds developing regions will see 1.2 billion people added, a 20.7% increase; while the population of developed countries will increase a mere 3.3% adding 41 million to the current 1.3 billion people.
the square below has anarea of 49ft2 what is the perimeter of the square
Answer:
28ft
Explanation:
if it's a square then each side is equal
the square root of 49 is 7
each side is 7 ft
7 ft times 4 sides is 28ft
Match each form of energy with its definition
Chemical energy
Kinetic energy
Potential energy
mechanical energy
energy of motion ----
the energy of the bonds between atoms-----
the sum of an object's kinetic and potential energies----
stored energy based on position or arrangement-------
Answer:
energy of motion is kinetic
energy of Bond between atom chemical energy
stored energy based on position or arrangement-potential
the sum of an object's kinetic and potential energies----mechinical
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Which of the following aqueous solutions would have the lowest freezing point?
0.1 M sodium chloride
0.1 M calcium phosphate
0.2 M potassium sulfide
0.3 M aluminum nitrate
0.3 M barium chloride
Answer:
0.1 M Calcium phosphate
Explanation:
Which is also
0.1mCal2
Consider the reaction.
A(aq)↽−−⇀2B(aq)=4.87×10−6 at 500 K
If a 2.00 M sample of A is heated to 500 K, what is the concentration of B at equilibrium?
Note the signs of equilibrium:-
Reaction don't procede forward or backwardConcentration of products and reactants remains same .So
if
Concentration of A is 2M then concentration of B should be same .
So equilibrium constant K is 1
[tex]\\ \rm\rightarrowtail K=\dfrac{[Products]^a}{[Reactants]^b}[/tex]
So
[B]=[A]^2[B]=2^2[B]=4MThe equilibrium constant K is the ratio of product of molar concentrations of products to the product of molar concentrations of reactants. The concentration of B in the given reaction is 0.0031 M.
What is rate of a reaction?Rate of a reaction is the rate of decrease in the concentration of the reactants or rate of increase in the concentration of products.
Consider the simple reaction A ⇄2B, the rate of the reaction can be written as follows:
rate = K [A]
Where, k is the equilibrium constant or rate constant and [A] is the concentration of reactant A. If A have any coefficients, then the coefficient number is written as power of the concentration term.
The equilibrium constant K = [B]²/ [A] it is given 4.87 ×10⁻⁶ . Thus concentration of B can be calculated as follows:
[B]² = K [A]
= (4.87 ×10⁻⁶)×2.00 M
=9×10⁻⁶
[B] = 0.0031 M
Hence, the concentration of the product B is 0.0031 M.
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Use the bond energy to calculate an approximate value of ΔH for the following reaction. Which is the more stable form of FNO2?
The Lewis structures in which there are no formal charges is the most stable. Hence, structure (b) is the more stable form of FNO2.
Lewis structureThe question is incomplete but I will try to answer you as much as I can. Now the equation is missing hence we can't numerically caculate the enthalpy chnage of the reaction from bond energies. However, we can do this using the formula; Σbond energy of reactants - bond energy of products.
Concerning the Lewis structures of FNO2, the most stable structure is structure (b) as shown in the image attached where the atoms have no formal charges.
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What properties of water are related to Oxidation?
Answer:
water has several important physical properties. Most of the physical properties of water are quite atypical e.g molar mass is 18.0151grams per mol and melting point is 0.00 degree
how many days it take to a year
Hey there!
January = 31 ☑️
February = 28 (sometimes 29 on a leap year) ☑️
March = 31 ☑️
April = 30 ☑️
May = 31 ☑️
June = 30 ☑️
July = 31 ☑️
August = 31 ☑️
September = 30 ☑️
October = 31 ☑️
November = 30 ☑️
December = 31 ☑️
Therefore, your answer is: 365
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state one possible mistake in a simple distillation setup and explain the significance of the mistake.
Answer:
liquid is heated. As the liquid is heated, the molecules within it gain the energy to escape the liquid phase and transition into the gas phase in the form of bubbles.
Explanation:
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Which statement is true about the total mass of the reactants during a chemical change?
A)It is destroyed during chemical reaction
B)It is less than the total mass of the products.
C)It is equal to the total mass of the products.
D)It is greater than the total mass of the products.
Answer:
c
Explanation:
mass is like matter it cant be created or destroyed so mass stays the same.
Answer:
C) It is equal to the total mass of the products.
Explanation:
The law of conservation of mass states that in a chemical reaction, the total mass of reactants is equal to the total mass of products.
- profparis
Which property of water makes it effective in protecting firefighters?
Answer:
water has a high specific heat
Explanation:
this should work as an answer