Answer:
3.96×10^−22J
Explanation:
First find the frequency of the photon from the equation
c=fλ
∴f=c/λ
=3×10⁸m/s / 0.050×10^−2m
=6×10¹¹Hz.
Energy of such photons is quantized and given by
E=hf
=(6.6×10^−34)(6×10¹¹)
=3.96×10^−22J
Among electromagnetic waves, UV rays are most dangerous because exposure to these radiation cause serious problems in living organism. The energy of photon is 3.96×10⁻²²J.
What is electromagnetic wave?Electromagnetic wave is a wave which contain two component one is electric component and other is magnetic component. The electric and magnetic component are perpendicular to each other. There are so many wave that comes under electromagnetic wave like infrared wave , radio wave
There is a relation between energy of wave. frequency of wave, and wavelength of wave
Mathematically,
E=hc/λ
where,
E = energy of electromagnetic wave
h is planks constant having value 6.67×10⁻³⁴js
c is speed of light that is 3×10⁸m/s
λ is the wavelength of electromagnetic wave
frequency=speed of light/wavelength
=3×10⁸m/s / 0.050×10⁻²m
=6×10¹¹Hz.
E=h×frequency
=(6.6×10⁻³⁴)(6×10¹¹)
=3.96×10⁻²²J
Therefore, the energy of photon is 3.96×10⁻²²J.
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Mechanism of cell destruction of Poison oak
Which salt is produced when sulfuric acid and calcium hydroxide react completely.
Answer:
calcium sulphate and water
PLS, I NEED HELP!!!!
Next, you will gradually apply heat to the sugar and observe the effects. Your goal is to identify the point at which sugar begins to melt. To get started, follow these steps. Then, answer the question that follows.
Pour 1 tablespoon of sugar into a cooking pan. Spread it out across the surface of the pan. Place the pan on a stove.
Because all stoves are different, you’ll need to identify your low, medium, and high heat settings before proceeding to step 3.
Use the method below to gradually heat the pan until you see the sugar begin to melt. Once the sugar melts, note how much time has elapsed and the final heat setting. If at any point the pan begins to smoke, immediately turn off the heat source and remove the pan from the heat. Heat the pan for these times and temperatures, stopping when the sugar begins to melt:
5 minutes on low heat
5 minutes on medium-low heat
5 minutes on medium heat
5 minutes on medium-high heat
5 minutes on high heat
When the sugar melts, turn off the stove and remove the pan from the heat. Do not touch the hot pan except by its handle. Use hot pads or oven mitts if the pan’s handle isn’t insulated. Let the pan sit off the heat on a heat-resistant surface until it cools.
Approximately how many minutes did it take for the sugar to melt? What was the final heat setting?
Repeat the process given in part D using salt instead of sugar. Did the salt melt? If so, approximately how many minutes did it take for the salt to melt?
When a high amount of heat is supplied, the sugar melts faster than when a low amount of heat is supplied.
What is melting?The term melting has to do with the breakdown of the bonds that hold the molecules of a substance together. Melting occurs when heat is applied continously to a body.
Now, the time taken for the sugar to melt depends on the amount of heat supplied. In other words, when a high amount of heat is supplied, the sugar melts faster than when a low amount of heat is supplied.
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When a high amount of heat is supplied, the sugar melts faster than when a low amount of heat is supplied. low heat makes the sugar take awhile to melt. High heat was the final heat setting. I took about 8-10 minutes.
Find the final temperature when 10 grams of aluminum at 130 c mixes with 200 grams of water at 25 c. assume no water is lost as water vapor. specific heat values (c) for aluminum= 0.901 j/g c and water 4.18 j/g c
Answer:
About 26.12 C°
Explanation:
Following q = mc∆t, assuming q is the same
(10g)(130 - T)(0.901j/g*c) = (200.0g)(T - 25)(4.18j/g*c)
T = 26.12
A solar flare may cause charged particles to enter the earth's atmosphere.
true false
Answer:
True
Explanation:
This is because the Earths ionisphere was distrubed which makes radio communications.
For each reaction below, use the drop-down menus to select which compound will form a precipitate. Note: It is possible that no precipitates form.
Na2S + Cd(NO3)2 → CdS + 2NaNO3
FeCl3 + 3KOH → 3KCl + Fe(OH)3
Na2CO3 + Ba(NO3)2 → BaCO3 + 2NaNO3
Answer:
1. Cadmium sulfide
2. Iron (III) hrydroxide
3. Barium carbonate
1. Cadmium sulfide
2. Iron (III) hydroxide
3. Barium carbonate
These three will form a precipitate in the respective reactions.
What is a precipitate?
In chemistry, a solid is formed by a change in a solution, often due to a chemical reaction or change in temperature that decreases the solubility of a solid.
[tex]Na_2S + Cd(NO_3)_2[/tex] → [tex]CdS + 2NaNO_3[/tex]
cadmium sulfide will form a precipitate.
[tex]FeCl_3 + 3KOH[/tex]→ [tex]3KCl + Fe(OH)_3[/tex]
iron (III) hydroxide will form a precipitate.
[tex]Na_2CO_3 + Ba(NO_3)_2[/tex] → [tex]BaCO_3 + 2NaNO_3[/tex]
barium carbonate will form a precipitate.
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Select the correct answer.
A compound has a molecular weight of 112.124 atomic mass units and the empirical formula C3H4O. What is the molecular formula of the compound? Use the periodic table to help you.
A.
C6H8O
B.
C9H12O3
C.
C8H4O2
D.
C4H8O2
E.
C6H8O2
.
Answer:
E
Explanation:
The empirical formula has a mass of
3*C = 3*12 = 36
4*H = 4*1 = 4
1*O = 1 * 16 = 16 Add
Total = 56
The actual mass of the molecule in nature is 112
Multiplier = nature's mass / empirical formula mass
Values
Nature's mass = 112
Empirical mass = 56
Solution
Multiplier = Natures mass/Empirical Mass
Multiplier = 112 / 56
Multiplier = 2
Formula
Nature's formula = (Emperical Mass)_multiplier
Nature's formula = (C3H4O)_2 Multiply
Nature's formula = C6H8O2
Check
C6 = 6*C = 6*12 = 72
H8 = 8*H = 8*1 = 8
O2 = 2*O = 2*16 = 32 Add
Total 112 which checks with what is given.
If 321.5 grams of phosphorus chloride are made, how many grams of phosphorus were consumed?
If 321.5 grams of phosphorus chloride are made, then 168.235 grams of phosphorus were consumed.
What is the relation between mass & moles?Relation between the mass and moles of any substance will be represented as:
n = W/M, whereW = given massM = molar massMoles of phosphorous chloride = 321.5g / 74.55g/mol = 4.315 mole
Given chemical reaction is:
2K + Cl₂ → 2KCl
From the stoichiometry of the reaction:
2 moles of KCl = produced by 2 moles of K
4.315 moles of KCl = produced by 4.315 moles of K
Mass of potassium = (4.315mol)(39g/mol) = 168.235 g
Hence required mass of phosphorous is 168.235 g.
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What are some differences between pure substances and mixtures?
Answer:
. a pure substance consists only of one element or one compound.
. a mixture consists of two or more different substances, not chemically joined together
How much carbon dioxide do the people of earth add to the atmosphere in one year?.
Answer: About 43 billion tons
Explanation:
This is gonna be quite hard to explain.
NEED HELP ASAP!
What is the frequency of a wave that has a wavelength of 28m? Remember that c = 2.998 x 10^8 m/s
A.) 10 Hz
B.) 1.07 x 10^7 Hz
C.) 10.7 Hz
D.) 2.3 x 10^7 Hz
Answer:
Frequency = Speed/wavelength
Frequency = 2.998 x 10^8 m/s ÷ 28m
Frequency = 1.07 x 10^7 Hz
how many moles of HCI in 72 gm?
Suppose a particular electron has only two allowed energy levels. How many different wavelength photons (spectral lines) would result from all electron 3 transitions between these levels
Energy levels are the fixed places from the nucleus to the electrons of the atoms. Three possible wavelength photons are possible from the transitional levels.
What are spectral lines?Spectral lines are the dark or light uniform spectrum caused by the surplus or insufficient photons in the atom. They absorb and emit light in a certain frequency range.
Photons are transmitted from one energy level to another level of lower energy, three transitions from levels 1 - 2, 1 - 3, and 2 - 3 are possible.
Therefore, 3 spectral lines are possible.
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find the iupac name for this question
Answer:
3 - Methylpent-2-yn-1-ol
The joining of two smaller nuclei to form one larger nucleus is called...
Select one:
a. alpha decay.
b. beta decay.
c. nuclear fusion.
d. nuclear fission
The table describes a gas in four different containers Which container has gas stored at the highest temperature?
The container that has lowest temperature will store more amount of gas as compared to high temperature container.
Which container has gas stored at the highest temperature?At lowest temperature, the container stored the large amount of gas because at lower temperature the gases contract so more space is available for the storage of more gases.
So we can conclude that the container that has lowest temperature will store more amount of gas as compared to high temperature container.
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Short Essay!
Explain how scientists have used the concept of metallic bonding to account for many of the physical properties of metalssuch as electrical conductivity and malleability .
PLS HELP!!
Answer:
Explanation:
Because electrons are delocalized around positively charged nuclei, metallic bonding explains many properties of metals. Electrical conductivity: Most metals are excellent electrical conductors because the electrons in the electron sea are free to move and carry charge.
3. related to the amount of energy a wave carries and is
measured from the top or bottom of the wave to the middle
a. frequency
b. wavelength
c. amplitude
Answer:
c
Explanation:
because is the measurement of amplitude
For the reaction: P4 + 6C12 – 4 PC13
What mass of PCl3 forms in the reaction of 75.0 g P4 with 275 g Cl2?
Answer:
332.3g
Explanation:
hope this helps loves x
What is a chemical equation? What does it tell you?
Answer:
A chemical equation is the symbolic representation of a chemical reaction in the form of symbols and formulas.
ICE
OC
TINITIAL
37°C
MWATER
231g
Heat will flow from the warm water into the 0° C ice.
Energy will flow until all of the ice has become water
and has the same temperature as the original warm
water, Tfinal. The amount of energy the warm water lost
(which is equal to the amount of energy the ice gained
in order to melt) can be calculated by the equation we
learned last week.
MICE +
MWATER
2.65 4
-22.5°C
TFINAL
AELost = MWATER * SH WATER (TINITIAL -TFINAL)
Х
Once you make this calculation you will have the
amount of energy that is needed to melt your total
mass of ice, so just divide it by the mass of ice you
melted and you will have the heat of fusion of ice
(Hfus for H,O) in Joules per gram of ice. Remember to
repeat the experiment at least one more time using a
different amount of water, a different amount of ice, and
.
Answer:
Suppose that several objects composed of different materials are heated in the same manner. Will the objects warm up at equal rates? The answer: most likely not. Different materials would warm up at different rates because each material has its own specific heat capacity. The specific heat capacity refers to the amount of heat required to cause a unit of mass (say a gram or a kilogram) to change its temperature by 1°C. Specific heat capacities of various materials are often listed in textbooks. Standard metric units are Joules/kilogram/Kelvin (J/kg/K). More commonly used units are J/g/°C. Use the widget below to view specific heat capacities of various materials. Simply type in the name of a substance (aluminum, iron, copper, water, methanol, wood, etc.) and click on the Submit button; results will be displayed in a separate window.
Explanation:
One form of energy can transform into another form of energy.
17 Energy in a flashlight's battery changes from ________ energy to electrical energy.
Answer:
Chemical
Explanation:
Chemical energy is stored in the batteries of a flash light. When the flashlight is used, the Chemical energy that was stored, is then used to make Electrical energy for the flashlight. Then electrical energy is converted to heat in the filament of the flashlight bulb. Some of the heat is lost to the surroundings, and some is converted into light energy.
short paragraph about volcano and its features.
Consider the following statistic. As of January 2009, the USA has produced 60,000 metric tons of nuclear waste in 60 years of operating 104 nuclear power plants. On average, how much waste is produced by each plant on a monthly basis? 0. 8 tons per month 83. 3 tons per month 104 tons per month 866. 3 tons per month.
Answer: A
Explanation:
Which hydrocarbon is unsaturated?
Which of these statements is false? The least reactive elements are in the far right column. Elements at the bottom of a column have more protons than elements at the top of a column. Elements on the left side of a row always have higher atomic mass than elements on the right side of that row. Elements along the steplike line have some properties of metals and some properties of nonmetals.
Answer:
Elements on the left side of a row always have higher atomic mass than elements on the right side of that row.
Explanation:
the answer I have above should be correct because it’s false so it’s the right answer.
Classify: Heat that is transferred in a circular motion with warm particles rising and cool
particles sinking in a gas and liquid is called____
Convection
Conduction
Radiation
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Why do some cells make food molecules?
Answer:
All living cells release energy from food molecules through cellular breathing and/or fermentation. Some cells make food molecules using light energy through the process of (making food from light).
Making food from light- Photosynthesis
Breathing- Respiration
All living units give out power for a given time from food small complex units through formed of small units breathing and or fermentation. Some units make food small complex units using light power for a given time through the process of (making food from light).
Amino acids are monomers for which biochemicals? nucleic acids polysaccharides lipids polypeptides
Answer:
polypeptides in other words proteins.
Amino acids are monomers for polypeptides. Therefore, the correct option is option D.
The chemical substances known as amino acids are what make up proteins. They are crucial for the development, upkeep, and repair of our body's cells and tissues. The distinctive structure of amino acids, which consists of a core carbon atom joined to an amino group, a carboxyl group, a hydrogen atom, and a side chain known as the R-group that varies between different amino acids, is what makes them stand out from other compounds. There are 20 different amino acids that are frequently present in proteins, each of which has a unique configuration of atoms in its R-group.
Therefore, the correct option is option D.
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(1) it takes 40 ml of a 0.25 m naoh solution to neutralize 100 ml of an hcl solution. what is the concentration of the hcl solution?
Answer:
0.1M
Explanation:
Using Neutralisation formula,
MaVa=MbVb
>>(0.25)(40)=Mb(100)
Mb=0.1M