Answer:
white light is made up of all colors of the rainbow
Explanation:
The white light of the sun is made up of all the colors of the rainbow. Therefore, option (4) is correct.
How is a rainbow formed?A rainbow can be described as a meteorological phenomenon that is caused by refraction, reflection, and dispersion of light in water results in a spectrum of light appear in the sky. It occurs in the form of a multicolored circular arc in the sky directly opposite the Sun.
Rainbows can be full circles but we normally see only an arc of illuminated droplets above the ground. In a primary rainbow, the arc indicates red on the outer and violet on the inner side. When the light is refracted when entering a water droplet, then reflected inside the back of the droplet and refracted again.
When the light enters a water droplet, it slows down and bends as it goes from air to denser water. The light reflects back the inside of the droplet and when light exits the droplet, it creates a rainbow.
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An unknown metal with a mass of 54.0 g required 773 J of energy in order to change its temperature from 63.0 C to 100.0 C. What is the identity of this metal?
Answer:
Metal is copper.
Explanation:
Mass of a metal, m = 54 g
Heat energy required, Q = 773 J
The temperature changes from 63.0 °C to 100.0 °C.
We need to identify the metal. Heat required to raise the temperature is given by :
[tex]Q=mc\Delta T[/tex]
c is specific heat of the metal
We can identify the metal by finding its specific heat.
[tex]c=\dfrac{Q}{m\Delta T}\\\\c=\dfrac{773}{54\times (100-63)}\\\\=0.386\ J/g^{\circ} C[/tex]
The metal is copper. Its specific heat is [tex]0.386\ J/g^{\circ} C[/tex].
Write the balanced nuclear equation for the alpha decay of each isotope.
200/84Po
nuclear equation:
thorium-229
nuclear equation:
244/96Cm
nuclear equation:
bismuth-210
nuclear equation:
Explanation:
First, a quick revision of radioactive decay:
During alpha decay, an alpha particle is emitted from the nucleus —- it is the equivalent of a helium atom (i.e. it has a mass of 4 and an atomic number of 2). So, let's take the following question:
Polonium-210 is a radioisotope that decays by alpha-emission. Write a balanced nuclear equation for the alpha decay of polonium-210.
In symbols, the equation becomes
210/84Po--->?+4/2HE
The sums of the superscripts and of the subscripts must be the same on each side of the equation.
Take 4 away from the mass number (210-4 = 206)
Take 2 away from the atomic number (84-2 = 82). Lead is element number 82.
So, the equation is
210/84 Po--->206/82Pb+4/2He
Now let's try one for beta decay — remember that, in beta decay, a neutron turns into a proton and emits an electron from the nucleus (we call this a beta particle)
Write a balanced nuclear equation for the beta decay of cerium-144)
In nuclear equations, we write an electron as 0^-1e.
144/58Ce-->144/59Pr+^0-1e
Here's a fission reaction.
A nucleus of uranium-235 absorbs a neutron and splits in a chain reaction to form lanthanum-145, another product, and three neutrons. What is the other product?
We write a neutron as 1/0n, so the equation is
235/92U +1/0n--->145/57La+X+3 1/0n
Sum of superscripts on left = 236. Sum of superscripts on right = 148. So X
must have mass number = 236 – 148 = 88.
Sum of subscripts on left = 92. Sum of subscripts on right = 57. So X
must have atomic number = 92 – 57 = 35. Element 35 is bromine.
The nuclear equation is
235/92U+1/0n--->145/57La+88/35Br+31/0N
A nuclear decay leads to the formation of a product that has a different isotope from that of the parent.
What is a nuclear equation?A nuclear equation has to do with an equation in which one isotope is transformed into a different isotope.
For 200/84Po;
200/84Po ----> 4/2 He + 196/82Pb
For 244/96Cm
244/96Cm -----> 4/2 He + 240/94Pu
For bismuth-210
210/83Bi -----> 4/2 He + 206/81Tl
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Why it important not to mix the test solution in one well with the solution in another week on your spot plate
Depending on the factors, combining two chemicals that aren't designed to interact might result in an explosion, an unintended chemical reaction, or a misleading result.
What is explosion ?An explosion is a sudden increase in volume accompanied by a tremendous energy release that typically results in the production of high temperatures and the discharge of high-pressure gases. High explosive detonations produce supersonic explosions that move through shock waves.
Explosions often fall into one of three categories: chemical, mechanical, or nuclear. Every kind of explosion has the potential to be devastating and serious, wreaking unimaginable damage on the local populace, environment, and infrastructure.
What causes gamma ray bursts is one of the largest unsolved questions of all. These bursts, which happen around once every day, are the most powerful explosions known to science.
Thus, depending on the factors, combining two chemicals that aren't designed to interact might result in an explosion, an unintended chemical reaction.
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fully explain, why each characteristic would or would not favor the formation of an amorphous solid
Answer:
Crystalline solids have regular ordered arrays of components held together by uniform intermolecular forces, whereas the components of amorphous solids are not arranged in regular arrays. The learning objective of this module is to know the characteristic properties of crystalline and amorphous solids. When cleaved or broken, they produce fragments with irregular, often curved surfaces; and they have poorly defined patterns when exposed to x-rays because their components are not arranged in a regular array. An amorphous, translucent solid is called a glass.
The heat of vaporization of an unknown liquid is 1,340 Joules per gram. What is the minimum number of Joules needed to change 20.0 grams of the liquid to vapor at the boiling point?
Answer:
The temperature of a boiling liquid remains constant until all of the liquid has been converted to a gas.For example, the amount of heat necessary to change one gram of water to steam at its boiling point at one atmosphere of pressure, the heat of vaporization of water, is approximately 540 calories.
Explanation:
A student is performing a titration on a solution of HNO3 with an unknown concentration. They used a solution of KOH that they determined the concentration to be 8.2 x 10-2 M beforehand. They use an aliquot of 15.0 mL of HNO3 to titrate.
a. If the equivalence point is reached after the addition of 18.5 mL of titrant, what was the original pH of the analyte? [1.00]
b. What would the pH of the analyte be at the equivalence point? [You should be able to figure this out yourself!]
c. If the student over-titrates the analyte and adds 19.2 mL of titrant, what would the pH of the analyte be? [11.22]
d. If the student under-titrates and only adds 10.0 mL of titrant, what is the pH of the analyte? [1.56]
e. Draw a titration curve for this question.
1. Show the short-hand electron configuration for Hafnium (Hf - atomic number 72), starting from [Kr].
2. What are the valence electrons for hafnium.
3. Explain why the 5d and 4f electrons for hafnium are not generally involved in chemical reactions.
Answer:
1. [tex]Hf:[Kr]4f^{14}5d^26s^2[/tex]
2. The valence electrons are 4.
3. Due to poor shielding of inner electrons.
Explanation:
Electronic configuration represents the total number of electrons that a neutral element contains. We add all the superscripts to know the number of electrons in an atom.
The element Hafnium (Hf) has atomic number of 72 and the nearest noble gas is Krypton has 36 electrons.
The electrons are filled according to Afbau's rule in order of increasing energies.
[tex]Hf:72:[Kr]4f^{14}5d^26s^2[/tex]
As Hafnium is a d block element amd it has 2 electrons in 5d and 2 electrons in 6s.
The eletrons in 5d and 4f are poorly shielded by the inner electrons and thus experience strong nuclear charge and thus do not participate in bonding.
Why are regions that receive more solar energy more likely to develop hurricanes
Explanation:
Plants are more likely to thrive in those regions. Those regions have more water evaporation. Regions that receive more solar energy are typically drier.
Place the following compounds in order from lowest to greatest vapor pressure. CH3CH2CH2CH3 CH3CH2OH CH3CH2CH3 NaF A B C D (Enter the letter corresponding to each compound.)
Answer:
C
Explanation:
There are 3 factors that affect the vapor pressure of a liquid, they are;
surface area
intermolecular forces and
temperature.
If we consider the options, we will notice that NaF is held together by strong ionic bonds in its crystal lattice. Also, CH3CH2OH is held together both by dispersion forces and strong hydrogen bonds.
However, CH3CH2CH2CH3 and CH3CH2CH3 are only held together by weak dispersion forces. Which of them is expected to have the weakest magnitude of intermolecular forces? We must know that larger and heavier molecules exhibit stronger dispersion forces than smaller and lighter ones.
This implies that the magnitude of intermolecular forces in CH3CH2CH2CH3 is much greater than that in CH3CH2CH3. Hence at the same temperature, CH3CH2CH3 has the greatest vapour pressure among the four substances listed in the question.
Why do leavening gases expand faster at higher altitudes
Answer:
Cakes, breads and other foods that contain leavening agents rise more quickly at higher altitudes, because gases produced by the agents expand faster than at sea level. The loaves may collapse if the gases dissipate before the proper temperature is reached. Most baking recipes can be adjusted for high altitudes.
Explanation:
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What is Entropy of reaction?
Answer:
The entropy change in a chemical reaction is given by the sum of the entropies of the products minus the sum of the entropies of the reactants.
Explanation:
Hope it helps
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According to the ,cell theory where do cells come from?
Answer:
cells come from pre existing cells
What's the percentage of C in CO2
Answer:
27.29%
Explanation:
Please, help me
The following reagents are required for laboratory practice.
Answer:
A
Explanation:
Answer:
A is the answer for this question
Please I need help!!!!
Answer:
the answer is b I am sure
Which is best represented by the equation?
2Mg + 02 → 2MgO
O A. Law of Conservation of Energy
O B. Law of Conservation of Mass
O C. Law of Superposition
Why are half-reactions used in redox reactions?
A) They make it possible to neglect the electrons that are being transferred.
B) they make it easier to keep track of spectator ions
C) They make it easier to see the oxidation and reduction parts of the reactions separately.
d) They make balancing the number of atoms in the reaction unnecassary
Answer:
c. they make it easier to see the oxidation and reduction parts of the reactions separately
Explanation:
just took the quiz :)
Methane CH4 gas and oxygen O2 gas react to form carbon dioxide CO2 gas and water H2O vapor. Suppose you have 11.0 mol of CH4 and 7.0 mol of O2 in a reactor. Suppose as much as possible of the CH4 reacts. How much will be left? Round your answer to the nearest 0.1 mol
Answer:
The number of moles of CH₄ that will remain is 7.5 moles
Explanation:
Complete combustion reaction of oxygen and methane is given as;
CH₄ + 2O₂ → CO₂ + 2H₂O
comparing the number of moles of methane and oxygen in the reaction above, the amount of methane used in the reaction is calculated as follows;
2 moles of O₂ -----------> 1 mole of CH₄
7 moles of O₂ ------------> x moles of CH₄
x = 7 / 2
x = 3.5 moles of CH₄
Total moles of CH₄ in the reactor = 11.0 moles
The number of moles that will remain = 11.0 moles - 3.5 moles
The number of moles that will remain = 7.5 moles
Therefore, the number of moles of CH₄ that will remain is 7.5 moles
What is the molar mass of 81.50 g of gas
exerting a pressure of 1.75 atm on the
walls of a 4.92 L container at 307 K?
The molar mass of gas = 238.29 g/mol
Further explanationGiven
mass = 81.5 g
P=1.75 atm
V=4.92 L
T=307 K
Required
molar mass
Solution
The gas equation can be written
[tex]\large{\boxed{\bold{PV=nRT}}[/tex]
[tex]\tt n=\dfrac{mass}{molar~mass}[/tex]
So the equation becomes :
[tex]\tt Molar~mass=\dfrac{mRT}{PV}[/tex]
Input the value :
[tex]\tt M=\dfrac{81.5\times 0.082\times 307}{1.75\times 4.92}\\\\M=238.29~g/mol[/tex]
Answer:
239
Explanation:
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What element is found in group 4 and period 5?
Answer:
answering so the person who wanted brainliest can get it :D
<3
Which TWO trends do the data show TWO answers Giving Brainliest Explain your answer:)
Answer:
C and D
Explanation:
C: You can tell from the pattern there is obviously a cycle it is following
D: When the line spikes you can see there are multiple warm temp spikes
Answer:
C and D is the answer. Plz mark as brainliest.
Explanation:
A sample of an unknown metal has a mass of 22.4g. A graduated cylinder contains 3.2 ml of water. After the metal sample is added to the graduated cylinder, the water level reads 4.7 ml. Calculate the density of the metal
Answer:
d = 14.9 g/mL
Explanation:
Given data:
Mass of metal = 22.4 g
Volume of eater = 3.2 mL
Volume of water + metal = 4.7 mL
Density of metal = ?
Solution:
Volume of metal:
Volume of metal = volume of water+ metal - volume of water
Volume of metal = 4.7 mL - 3.2 mL
Volume of metal = 1.5 mL
Density of metal:
d = m/v
d = density
m = mass
v = volume
d = 22.4 g/ 1.5 mL
d = 14.9 g/mL
15 POINTS PLS ANSWER CORRECTLY AND FAST
Drag the tiles to the boxes to form correct pairs.
Read the excerpts from Mark Twain's Adventures of Huckleberry Finn.
Match each of these examples of external conflict with the type of conflich
It reflects.
1. character versus character
2. character versus nature
3. character versus society
a. Huck travels down the dangerous and
long Mississippi River.
b. Huck helps Jim, a runaway slave,
even though he knows his community
would not approve.
c. Huck stops con men named the duke and
Dauphin from cheating the townspeople.
The order it would go in is character versus nature character versus society and finally character versus character
hope this helps
The first example is that of conflict between character versus nature followed by character versus character and character versus society.
What is a conflict?
Conflict is defined as an activity which occurs between two persons who are though conscious but not rational.It is usually defined in terms of wants of a person , needs or obligations.
There are four types of conflict , 1) self conflict which is the conflict with self 2) conflict with others based on differences on opinions 3)conflict with environment in order to adjust withe the environmental problems and 4) conflict with supernatural in opposition to the belief in super natural powers.
Conflict can also be emotional,intellectual as well as theoretical,intellectual conflict is also a sub class of cultural conflict.
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PLASE ANSWER NOW! How many days and hours does a lunar cycle last? A lunar cycle last ___ days and ___ hours.
Answer:
How Long Is The Lunar Cycle: Each lunar cycle lasts 27 days, 7 hours and 43 minutes. This means that the moon takes almost 28 days to complete a full orbit around the earth. Over this course, the moon goes through several phases, which alters its appearance and even the pattern of movement in the sky.
Explanation:
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Answer:
27 days and 7 hours
Explanation:
im guessing on this one but im pretty sure its correct it also says that our moon completes the cycle in 29.5 days.
what is the smallest division on 4 balance
Answer:0.1g
Explanation:
Answer: The smallest scale division is a tenth of a centimeter or 1 mm.
Explanation: I got this from a website but I hope it helps!
When bonding to other elements, it is easier for a sodium atom to gain seven electrons than to lose one electron.
Answer:
it's easier to lose one electron because it's less work for the atom to do and easier to lose one than gain a whole 7, because the atom wants to gain a full outer shell as soon as possible
Write an equation that shows the formation of a cesium ion from a neutral cesium atom.
Answer:
Cesium is an Element in the Periodic table with atomic number 55, symbol Cs and belongs to the first group of the metals which is Alkali metals.
Ionization energy (IE) is defined as the amount of energy consumed by a ground state gaseous atom to discharge an electron which will results in a formation of a Cation
It forms ions be releasing the electron
[tex]Cs(g) + IE[/tex] → [tex]Cs^+ + e^-[/tex] IE= 38.939 KJ
which climate zone gets the smallest amount of solar energy throughout the year brainly
giving brainliest
Answer: A.
Explanation: The poles get the least amount of sunlight throughout the year.
How do other factors shape earths surface
Answer:
Other factors shape earths surface are:
Factors that Shape Earth's Surface.
Unit Notes.
Plate Tectonics. Continental Drift. ...
Results of plate movement. ...
Weathering. ...
Erosion and Deposition.
Use the ideal gas law formula (PV = nRT R = 0.0821 L atm/mol K) to determine the volume of 1.00
mole of a gas under the following conditions:
T= 273 K P = 2.00 atm
V=_
IL
T = 546 K, P = 1.00 atm
V =
L L
T = 409.5 K P = 1.50 atm
V=L
Answer:
11.2 , 44.8 , 22.4
Explanation:
on edge
The volume with the help of the ideal gas equation for the first condition is 11.2L, the second condition is 44.8L, and for the third condition is 22.4L.
Ideal gas equation[tex]PV=nRT[/tex]
where P =pressure, V = volume, n = moles of gas, R = rydberg constant, and T = temperature.
Rearrange the above equation for the calculation of Volume as follows,
[tex]V=\frac{nRT}{P}[/tex]
We can calculate the volume for the first condition as follows,
Substitute 0.0821 Latm/Kmol for R, 273 K for T, 2atm for P, 1 for n in the above equation,
[tex]V=\frac{1 mol\times0.0821Latm\ Kmol\times273K}{2 atm} \\=11.20 L[/tex]
For the second condition,
[tex]V=\frac{1mol\times0.0821 L atm/mol K\times546K}{1 atm} =44.8L[/tex]
For third condition,
[tex]V=\frac{1mol\times0.0821 L atm/mol K\times409.5K}{1.50 atm} =22.4L[/tex]
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