The hydrogen emission spectrum is shown below. What is the energy of the
486 nm emission line? (The speed of light in a vacuum is 3.00 x 10^8 m/s, and Planck's constant is 6.626 x 10^-34 Jos.)
A. 2.44 x 10^18 J
B. 7.33 x 10^26 J
C. 6.17 x 10^14 J
D. 4.09 x 10^-19 J
Answers
Answer:
D
Explanation:
answer is in photo above
Related Questions
19
Gold reacts with the elements in Group 7 of the periodic table.
0.175 g of gold reacts with chlorine.
The equation for the reaction is:
2 Au + 3 Cl2 - 2 AuCla
Calculate the mass of chlorine needed to react with 0.175 g of gold.
Give your answer in mg
Relative atomic masses (Ar): Cl = 35.5 Au = 197
Answers
Answer: The mass of chlorine gas required is 94.6 mg
Explanation:
The number of moles is defined as the ratio of the mass of a substance to its molar mass.
The equation used is:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] ......(1)
Given mass of gold = 0.175 g
Molar mass of gold = 197 g/mol
Plugging values in equation 1:
[tex]\text{Moles of gold}=\frac{0.175g}{197g/mol}=0.000888 mol[/tex]
The given chemical equation follows:
[tex]2Au+3Cl_2\rightarrow 2AuCl_3[/tex]
By the stoichiometry of the reaction:
If 2 moles of gold reacts with 3 moles of chlorine gas
So, 0.000888 moles of gold will react with = of chlorine gas
Molar mass of chlorine gas = 71 g/mol
Plugging values in equation 1:
[tex]\text{Mass of chlorine gas}=(0.001332mol\times 71g/mol)=0.0946g=94.6mg[/tex] (Conversion factor: 1 g = 1000 mg)
Hence, the mass of chlorine gas required is 94.6 mg
Standardization of a Borax solution (Na2B4O7). You are given a 1.044 M solution of H2SO4. It takes 2.63 mL of this H2SO4 to reach the end point. Knowing it takes 1 H2SO4 to neutralize 2 Na2B4O7, what was the concentration of this Borax solution?
Answers
The question is incomplete, the complete question is:
Standardization of a Borax solution (Na2B4O7). A student titrates a 20.00 mL sample of an aqueous borax solution with 1.044 M H2SO4. It takes 2.63 mL of acid to reach the equivalence point. Knowing it takes 1 H2SO4 to neutralize 2 Na2B4O7, what was the concentration of this Borax solution?
Answer: The concentration of borax solution is 0.069 M.
Explanation:
To calculate the concentration of borax solution, the formula used is:
[tex]n_1C_1V_1=n_2C_2V_2[/tex] ....(1)
where,
[tex]n_1, C_1\text{ and }V_1[/tex] are the n-factor, concentration and volume of sulfuric acid
[tex]n_2,C_2\text{ and }V_2[/tex] are the n-factor, concentration and volume of borax solution.
We are given:
[tex]n_1=1\\C_1=1.044M\\V_1=2.63mL\\n_2=2\\C_2=?M\\V_2=20mL[/tex]
Putting values in equation 1, we get:
[tex]1\times 1.044\times 2.63=2\times C_2\times 20\\\\C_2=\frac{1\times 1.044\times 2.63}{2\times 20}\\\\C_2=0.069M[/tex]
Hence, the concentration of borax solution is 0.069 M.
Write the net ionic equation for this precipitation reaction. Include physical states. 2LiCl(aq)+Pb(CH3COO)2(aq)⟶PbCl2(s)+2LiCH3COO(aq)
Answers
Answer:
[tex]{ \bf{ 2 Cl{}^{ - } _{(aq)} + Pb {}^{2 + } _{(aq)} \: ⟶ \: PbCl _{2(s)}}}[/tex]
Iron oxide reacts with aluminum to give aluminum oxide and iron, what kind of chemical is this?
A) Combustion
B) decomposition
C) replacement
D) synthesis
Answers
Answer:
[tex]{ \tt{c). \: replacement}}[/tex]
C) replacement
Iron(III) oxide (Fe2O3) reacts with aluminium(Al) to form aluminium oxide(Al2O3) and molten iron(Fe). This is a replacement reaction
What point A on the phase diagram called?
liquid
(374°C/218 atm)
A
solid
pressure (atm)
gas
temperature (°C)
OA.
the melting point
OB.
the boiling point
Ос.
the freezing point
OD
the critical point
OE.
the triple point
Answers
Answer:
D) the critical point
Explanation:
Point A is the critical point in phase diagram. This is the highest temperature and pressure at which a pure material can exist in vapor/liquid equilibrium. Pretty cool!
Give reason for the following:
(a) Silver nitrate solution is kept in coloured bottles.
(b) Molybdenum is used in the manufacture of ammonia.
(c) Blue solution of copper sulphate changes to green when a piece of iron is added to this solution.
Answers
Answer:
a) In the presence of light silver nitrate decompose to form silver. hence to prevent the decomposition it is kept in dark coloured bottles.
b) Molybdenum is used in the manufacture of ammonium because molybdenum acts as a promoter which increases the efficiency of the catalyst Iron, resulting in better yield of ammonia.
c) When an iron nail immersed in the solution of copper sulphate than iron displaces copper from the solution of copper sulphate because iron is more reactive than copper. Therefore copper sulphate solution colour changes from blue to pale green.
ionic bonds show which characteristics that arent seen in covalent bonds
Answers
balance equation P2O5 + H20 - - - - > H3PO4
Help me.....
Answers
Answer:
Search by reactants (P 2O 5, H 2O) and by products (H 3PO 4)
H2O + P2O5 → H3PO4
H2O + HNO3 + P2O5 → H3PO4 + N2O5
Which describes the molecule below?
O
A. A lipid with three unsaturated fatty acids
O
B. A lipid with three saturated fatty acids
O C. A lipid with two unsaturated fatty acids and one saturated fatty
acid
O D. A lipid with two saturated fatty acids and one unsaturated fatty
acid
Answers
The molecule is described as the, A. lipid with three unsaturated fatty acids.
A collection of two or more atoms bonded together by attractive forces known as chemical bonds is referred to as a molecule. In the given question, the molecule shown in diagram is a lipid, or triglyceride, with three fatty acids and a glycerol backbone. Unsaturated fatty acids are those with double or triple bonds in their molecular makeup.
Depending on how many double or triple bonds are typically there in its structure, a fatty acid can either be polysaturated or monounsaturated. Generally, there are three unsaturated fatty acids in this lipid, all of which contain one double bond in their structures.
Read more about molecule on:
https://brainly.com/question/30337264
#SPJ1
ways to manage non-biodegradable waste wisely
Answers
Answer:
Non-biodegradable wastes can be managed by practicing the concept of 3Rs—Reduce, Reuse, and Recycle.
...
Management Of Non-Biodegradable Wastes
Use fountain pen in place of a ballpoint pen,
Use old newspapers for packaging, and.
Use cloth napkins in place of disposable ones.
Explanation:
there!
¿A qué se refiere cuando se dice que el trabajo científico es cualitativo y cuantitativo? Por favor
Answers
Answer:
ver explicacion
Explanation:
La investigación cualitativa tiene que ver con la investigación que implica la recopilación de datos no numéricos, mientras que la investigación cuantitativa tiene que ver con la recopilación de datos numéricos.
La investigación científica a menudo tiene que ver con la observación y la realización de inferencias. Este aspecto de la investigación científica es cualitativo.
Al mismo tiempo, es posible que también se requieran gráficos, tablas y cuadros para la presentación de datos en ciertos tipos de investigación científica. Esta es ahora una investigación cuantitativa.
Por tanto, la investigación científica es tanto cualitativa como cuantitativa
4. How much heat required to convert (heat up) 16 gm of ice to 125°C of steam
Cice = 2.03 J/gm.°C,
L = 2.264 J/gm
Cwater = 4.184 J/gm.°C
4 = 0.334 J/gm
Csteam = 1.996 J/gm.°C
Answers
Answer: it requires the amount of heat that it takes to make it steam
Explanation:
An ideal gas is a gas.
Perfect
Theoretical
Real
Answers
Answer:
An ideal gas is a theoretical gas composed of many randomly moving point particles that are not subject to interparticle interactions. The ideal gas concept is useful because it obeys the ideal gas law, a simplified equation of state, and is amenable to analysis under statistical mechanics.
An ideal gas is theoretical
Which best describes a mixture?
It has a single composition, and it has a set of characteristics that does not change.
O It can have different compositions, but it has a set of characteristics that does not change.
O It has a single composition, but it has a set of characteristics that does change.
It can have different compositions, and it has a set of characteristics that does change.
Mark this and return
Save and yit
Answers
Answer:
I think the answer would be b, sorry if I'm wrong(EDIT: ITS ACTUALLY AAAAA)
Which of the following would be expected to have the highest viscosity? CH3CH2OH, HOCH2OH, CH3CH2CH3
О НОСН2ОН
O They are all the same.
О СН3СН2ОН
O CH3CH2CH3
Answers
Answer: Out of the given options [tex]HOCH_{2}OH[/tex] is expected to have the highest viscosity.
Explanation:
The resistance occurred in the flow of a liquid substance is called viscosity.
More stronger is the intermolecular forces present in a substance more will be its resistance in its flow. Hence, more will be its viscosity.
For example, [tex]HOCH_{2}OH[/tex] has strong intermolecular hydrogen bonding than the one's present in [tex]CH_{3}CH_{2}OH[/tex] and [tex]CH_{3}CH_{2}CH_{3}[/tex]. This is because two-OH groups are present over here.
Thus, we can conclude that out of the given options [tex]HOCH_{2}OH[/tex] is expected to have the highest viscosity.
How is alkyne converted to acetone?
Answers
Answer:
Propyne can be converted to the acetone when it is made to undergo the reaction with mercuric sulphate followed by hydrolysis and thus, resultant product, thus formed is acetone.
Explanation:
Question 9 of 10
Which functional group does the molecule below have?
Answers
Answer:
Hydroxyl
Explanation:
A P E X
An earthquake occurs at 8:15:35 PM, and a seismic station detects the P-
wave at 8:20:05 PM. What was the travel time for the P-wave to this
seismic station? *
- 3 minutes and 30 secs
-4 minutes and 30 secs
-5 minutes and 30 secs
-6 minutes and 30 secs
Answers
Answer:
5 minutes 35 seconds because an earthquake travels underground faster than on the surface
Which statements are true of the reaction below? 2Na(s) + Cl2(g) ---> 2NaCl(s)

A.
Na(s) is a reactant.

B.
NaCl is a product.

C.
NaCl is a liquid.

D.
Cl2 is a solid.
Answers
Answer:
A and B are both true
Explanation:
Na is REACTING with Cl2 to PRODUCE NaCl
a glucose molocule is the
Answers
Answer: Glucose (C6H12O6) is a hexose -- a monosaccharide containing six carbon atoms. Glucose is an aldehyde (contains a -CHO group). Five of the carbons plus an oxygen atom form a loop called a "pyranose ring", the most stable form for six-carbon aldoses.
Explanation:.
URGENT HELP
26. A solution of hydrogen peroxide is 23.3% H2O2 by mass and has a density of 1.11
g/cm”. The molarity of the solution is:
a) 7.14 M
b) 0.259 M
c) 7.60 M
d) 7.93 M
e) none of these
Answers
QUESTION ABOUT IONIC COMPUND DUE IN 7 MINUTES URGENT!!!!!!!!!!!!!
Answers
Answer:
NH2S4. . ...............................,..
Which group on the periodic table contains chemical elements that are shiny and conduct electricity?
A.
Metalloids
B.
Nonmetals
C.
Representative elements
D.
Metals
Answers
Elements that are shiny, solid, conducts electricity, has atomic mass of 108 is metal.
Help, quick, pls
What is a displacement reaction?
Answers
[tex]\begin{aligned} -5x+4y &= 3\\\\ x&=2y-15 \end{aligned}[/tex]
When does carbon dioxide absorb the most heat energy?
during freezing
during deposition
during sublimation
during condensation
Answers
Answer:
it happenes during sublimation
Answer:
C
Explanation:
Edg
Terry usually rides his bike 15mph. If his riding speed is reduced by 3mph how far can he ride in 1.7 hours
Answers
Answer:
20.4 Miles
Explanation:
If Terry's riding speed is reduced by 3mph, he would be riding at 12mph.
12*1.7 = 20.4 miles
(miles per hour literally means how many miles you can travel in an hour at your current speed)
2. What is the name of the lens of a microscope through which the image is viewed?
a. objective
c. diaphragm
b. eyepiece
d. stage
Answers
Answer:
b
Explanation:
the ocular lens or eyepiece lens ...so its b
Which statement best describes why industry uses heterogeneous catalysts?
They tend to be more stable.
They are all gases at room temperature.
They form strong bonds with reactant molecules.
They cause stronger bonds to form between molecules.
Answers
Answer:
They tend to be more stable
Explanation:
A heterogeneous catalyst is a type of catalyst that exist in a phase which is different from the phases of the reacting mixture or specie or the products and the reactants are absorbed into sites on the catalyst for binding
The heterogeneous catalyst is used in industry because of its main advantage, which is its ease and simplicity of separation from the mixture of the reaction using a straightforward process such as filtration to recover and reuse a costly (heterogeneous) catalyst
Therefore, industry uses the heterogeneous catalyst because the catalyst tend to be more stable and can be easily recovered and reused in its original form
Answer:
A. They tend to be more stable.
Explanation:
Got a 100 on E2020.
A student is performing an experiment that requires measuring the boiling point of water. The accepted
value for the boiling point of pure water is 100.0°C. In the experiment, the student measured the boiling
point to be 99.2°C. What is the percent error in the student's experiment?
Answers
Answer:
.8°c my fingers jfjfjkfkrhrb
5. Discuss the phenomena of sunrise and sunset seen on Earth and describe how they will be different from the perspective of outer space. PLS IM OFFERING 15 POINTS PLSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS
Answers
Answer:
deez
Explanation: