If spin is not included, there are 4 different waves functions correspond to the first excited level n = 2 for hydrogen.
What are wave function?In quantum mechanics, a wave function is a variable quantity that mathematically describes a particle's wave characteristics.
The probability of a particle being present at a given point in space and time is related to the value of the particle's wave function.
Thus, there are 4 different waves functions correspond to the first excited level n = 2 for hydrogen.
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The Earth's orbit is a(n) ___shape.
.
Answer:
elliptical/ellipse
Explanation:
» Concepts
Astronomer Johannes Kepler discovered and founded his three laws of planetary motion. One of these laws states that the orbit of all planets, including Earth, is in an elliptical shape rather than a circle.
I need this table filled out. 'in this project, you will create models of various atomic nuclei and how they change during radioactive
decay, fission, or fusion. first, you will complete a table that summarizes how the structure of the nuclei
changes during each of these processes. this will help you plan your models.
The model of atoms undergoing nuclear fission will decrease in size while that of atoms undergoing nuclear fusion will increase in size.
What is radioactive decay?Radioactive decay is a process in radioactivity in which the nucleus of atoms spontaneously breakdown or decay to produce smaller atomic nucleus with the emission of radiation.
Nuclear fusion involves the merging together of the nucleus of two or more smaller atoms to produce a larger atom whereas nuclear fission is the splitting of the nucleus of larger atoms into smaller atomic nuclei.
Therefore, the model of atoms undergoing nuclear fission will decrease in size while that of atoms undergoing nuclear fusion will increase in size.
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Answer:
This is for the table
Explanation:
Sorry for my handwriting
the half life for strontium-90 is 29 years. how many half-lives did the sample go through at the end of 87 year
= 87 : 29
= 3 half lives
am i doing this right??? if not how can i change it?!
Answer:
yes you are doing it right my chemistry teacher said said so
A laser with a power output of 2. 15 mw at a wavelength of 413 nm is projected onto calcium metal
Each photon will give one electron, thereby the number of photons given each second are [tex]4.46\;\times\;10^{15}[/tex]. The power carried by the electrons is 0.255 mW.
What is a laser?
A laser is a light-emitting device that enables the process of optical amplification to deduce electromagnetic radiations.
The given laser has a power output of 2.15 mW and a wavelength is 413 nm.
The energy of each photon emitted is given as:
[tex]E=h\nu=\dfrac{hc}{\lambda}=\rm \dfrac{(6.63 \;\times\; 10^{-34} m^2 kg s^{-1}) \;\times (3.0 \;\times\; 10^8 m s^{-1})}{413 \;\times\; 10^{-9} m}=4.81 \;\times\;10^{-19}[/tex]
The number of photons ejected at 2.15 mW is given as:
[tex]\rm \dfrac{2.15\;\times\;10^-^3\; J}{4.81\;\times\;10^-^1^9J}=4.46\;\times\;10^1^5 \;photons[/tex]
Each photon will give one electron, thereby the number of photons given each second are [tex]4.46\;\times\;10^{15}[/tex].
With the work function of 2.71 eV, the power carried by the electrons is given as:
[tex]KE_{e}=h\nu-\Phi=\rm 4.81\;\times\;10^{-19} J - 2.71 eV\;\times\; \dfrac{1.60 \;\times 10^{-19} J}{1 eV}=6.34 \;\times 10^{-20}[/tex]
The power carried by all the electrons ejected is given as:
[tex]P_{e}=\rm (4.02\;\times\;10^1^5 s^{-1}) \;\times\; (6.34 \;\times\; 10^{-20} J)=0.255 \;mW[/tex]
The power carried by the electrons is 0.255 mW.
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Difference between dipole dipole and hydrogen bonding
Hydrogen bonds are stronger than the dipole dipole attraction force present in any molecule.
What is bonding in molecules?Bonding is a type of attraction force which is present between the different atoms or elements of any substance.
Dipole dipole attraction force is a weak force as compared to the hydrogen bonding and present between any two oppositely charged atoms.Hydrogen bond is present between the hydrogen atom and more electronegative atoms like O, S, N and F.Hence main difference is that hydrogen bond is only present between the hydrogen atom and more electronegative.
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Why does the handle of a metal spoon get hotter than a wooden spoon
would?
A. The metal spoon gets more convection heating.
B. The metal spoon is a better thermal conductor.
C. The metal spoon is a better thermal insulator.
D. The metal spoon has a higher total mass.
Answer:B
Explanation:
The metal spoon is a better thermal conductor. Hence, option B is correct.
What is a thermal conductor?A thermal conductor is a material that allows the energy in the form of heat, to be transferred within the material, without any movement of the material itself.
Metals are good conductors. Laying on the metal handle of the metal cooking pot. It appears that the pot is sitting on top of a campfire.
Since metal is a good conductor of energy, the spoon gets hot because heat is transferred through the metal pot to its handle, and then to the metal spoon.
Hence, option B is correct.
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100 points litterly please help which term applies to what happens to visible light when it interacts with transparent glass
Answer:
The light goes through
Explanation:
The light goes through the transparent glass without being reflected or absorbed, for example, a window is a transparent glass, you never see light being reflected off of a window
Hope this helps (:
Grams of potassium chloride per 100 g of water (experimental) in the original solution. Show calculation
The mass of potassium chloride with solubility 253.9 g/mL present in 100 grams of solution is 25.4 grams.
What is concentration?Concentration is given as the quantity of the solute present in the solution. The water at 25 degrees Celsius has density of 0.9982 g/mL.
The mass of the 100 grams of water is given as:
[tex]\rm Density=\dfrac{mass}{volume}\\\\0.9982\;g/mol=\dfrac{100\;grams}{Volume}\\\\Volume=100.180\;mL[/tex]
The solubility of potassium chloride is 253.9 g/mL
The grams of potassium chloride in the 100 grams solution will be:
[tex]\rm Mass\;of\;potassium\;chloride=\dfrac{253.9}{1000}\;\times\;100.81\;g\\\\Mass\;of\;potassium\;chloride=\25.4\;g[/tex]
Thus, the mass of potassium chloride present in 100 grams of water is 25.4 grams.
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The equation that describes the change in temperature of a solvent due to a solute is AT6 = i xKb x molality. How much salt would one need to add to 1 kg water to change the boiling temperature
by 5°C? Give your answer in moles. Show your work. (Kb =
0.51°Cfor water and i = 2 for NaCl.
4.9 moles of salt are required to be added to 1 kg water to change the boiling temperature
by 5°C.
What is the moles of Salt required to change the temperature of water by 5°C?Based on the given equation, the molality of the solution is calculated as follows:
Molality = change in temperature/ Kb × IChange in temperature = 5 °C
Kb = 0.51
i = 2
Molality = 5/0.51 × 2 = 4.9 molal
Also, Molality = moles/kg of water
Moles of salt = molality × kg of water
Moles of salt = 4.9 × 1 = 4.9 moles.
Therefore, 4.9 moles of salt are required to be added to 1 kg water to change the boiling temperature
by 5°C.
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PLEASE HELP ASAP
Calculate the enthalpy change for the reaction 2K + S + K2S using the following thermochemical reactions. K+S → KSAH = +32.5 kJ KS + K + KS AH = +38.2 kJ
The enthalpy change for the reaction 2K + S + K2S using the following thermochemical reactions is mathematically given as
dn=70.7kg
What is the enthalpy change for the reaction?Generally, the equation for the Chemical reaction is mathematically given as
2k+s----->K2S
Therefore
KS+K----->K2S
Therefore
dn=dn1+dn2
dn=32.5+38.2
dn=70.7kg
In conclusion, the enthalpy change is
dn=70.7kg
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A student placed a glass slide containing a small piece of onion under the lens of a microscope. The image shows the view seen in the microscope at a magnification of 30X
The total question is not found here but the onion structures that we can see with 30 X are the cell wall and an important vacuole.
What is 30X magnification?The 30X magnification does not exist, nowadays the current objective lens comes in 20X, and 40X.
Using this magnification, we might see plant cells that divide to produce cell walls between daughter cells after a process called mitosis.
In conclusion, the total question is not found here but the onion structures that we can see with 30 X are the cell wall and an important vacuole.
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How many grams and moles contain:
a. 3.011 × 10^24 atoms CO².
b. 9.033 × 10^22 molecules N².
Answer:
A.3.011 x 10^24 atoms CO²
[tex] \overline{ \quad \quad \quad \quad\quad\quad\quad\quad\quad}[/tex]
hope it helps!
93.0 grams of water to moles
Answer:
5.1622 mol This is the answer for your questions
A new penny has a mass of 2.49 g and a volume of 0.349 cm3. is the penny made of pure copper?
Looking at the density of the penny which is 7.1347 g/cm³, it can be concluded that it is not made from copper.
What is density?It is the ratio of the mass of a substance to its volume.
Mathematically; density = mass/volume
In this case, the mass of the coin is 2.49 g, and the volume is 0.349 cm³. Thus:
Density of coin = 2.49/0.349 = 7.1347 g/cm³
The density of copper is 8.96 g/cm³ at room temperature.
Hence, the penny is not made of copper.
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What are the main problems associated with nuclear electricity generation?
Check all that apply.
The disposal of radioactive waste.
Is the most expensive source of energy.
The danger of a nuclear accident.
Nuclear electricity generation requires a lot of fuel.
None to above.
Answer: The disposal of radioactive waste.
Is the most expensive source of energy.
Nuclear electricity generation requires a lot of fuel.
Explanation: This are the main problems of Nuclear Electricity Generation.
Which quantity is equivalent to the product of the absolute index of refraction of water and the speed of light in water?
The quantity which is equivalent to the product of the absolute index of refraction of water and the speed of light in water system is the speed of light in vacuum.
What is the speed of light?Speed of light is the rate of speed though the light travels. To find the speed of light in any medium, the following formula is used.
[tex]v=\dfrac{c}{n}[/tex]
Here, (n) is the index of reaction and (c) is the speed of light in the vacuum. The speed of light in the vacuum is almost equal to the 3.0×10⁸ m/s.
Now the quantity which is equivalent to the product of the absolute index of refraction of water and the speed of light in water has to be find out.
The above formula can be written as,
[tex]v=\dfrac{c}{n}\\vn=c\\c=vn[/tex]
Here, the product of index of refraction and speed of light is equal to the speed of light in vacuum. This will be true for water as well.
Thus, the quantity which is equivalent to the product of the absolute index of refraction of water and the speed of light in water system is the speed of light in vacuum.
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Which two changes would increase the density of ocean water?
A. increasing the amount of light that enters it
B. decreasing its temperature
C. Decreasing its salinity
D. increasing the amount of water that evaporates from it
REMEMBER 2 answers
Where dose the energy that drives the rock cycle come from
Answer:
It comes from the sun.
What is the change in entropy of 250 g of steam at 100 ∘c when it is condensed to water at 100 ∘c?
Entropy change is the randomness of the thermodynamic system. The change in the entropy when the water is condensed is 1573 J/K.
What is the entropy change?An entropy change is a product of mass and the ratio of the enthalpy of vaporization to the temperature.
Given,
Enthalpy of vapourization = 2257 J/gK
The temperature in kelvin = 373 k
The change in entropy is calculated as:
[tex]\begin{aligned} \rm \Delta S &= \rm m (\dfrac{\Delta H_{vap}}{T})\\\\&= 260 (\dfrac{2257}{373})\\\\&= 1573.24\;\rm J/K\end{aligned}[/tex]
Therefore, the change in entropy is 1574 J/K.
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Why are atoms considered the building blocks life?
How many moles of oxygen are contained in. 752 moles of calcium carbonate?
Answer:
2.256 moles of oxygen atoms
Explanation:
CaCo3 is calcium carbonate
every mole of calc carb has 3 moles of O atoms
.752 moles of this has 3 times as many moles of Oxygen atoms
According to the mole concept , there are 2.256 moles of oxygen in 0.752 moles of calcium carbonate.
What is a mole?Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.
It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.
It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass in grams present in one mole of atoms is its atomic mass.
As 1 mole of calcium carbonate has 3 moles of oxygen ,
∴ in 0.752 moles of calcium carbonate there are 0.752×3=2.256 moles.
Thus,there are 2.256 moles of oxygen in 0.752 moles of calcium carbonate.
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Chemical equation reaction between h2co3 and ba(oh)2
The chemical equation between Ba(OH)2 and H2CO3 is Ba(OH)₂ + H₂CO₃ → BaCO₃ + 2 H₂O.
What is a balanced equation?A balanced equation has the reactants are on the left side of the arrow, whereas the products are on the right.
The number in front of a chemical formula denotes the number of moles in a compound. The number of atoms in a single molecule is indicated by subscripts (numbers below an atom).
Thus, the chemical equation is Ba(OH)₂ + H₂CO₃ → BaCO₃ + 2H₂O.
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Rules for naming ionic compounds wiht transition metal
Rules for naming ionic compounds with transition metal requires the elementary name of metal followed the anion name with suffix ide.
What are ionic compounds?Ionic compounds are made up of ions, which are charged particles that occur when an atom (or group of atoms) acquires or loses electrons. Generally cations are metals and anions are non metals in it.
Following rules will be considered during naming:
First determine the metal's elemental name.Give the nonmetal its elemental name and the suffix -ide.Use roman numerals to denote positive charge when naming metals that can have distinct oxidation states.Name the polyatomic ions according to their names.Hence rules for naming are listed above.
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Calculate after 2.00 y, 1.986 g of a radioisotope
remains from a sample that had an original mass of
2.000 g.
a. calculate the half-life.
b. how much of the radioisotope remains after 10.00 y?
Answer!
After 2 years, 1.986 g of a radioisotope material remains from a sample of the original mass of 2g, what is the half-life of the sample? - Radioactive decay occurs according to the formula:
A = A0 * exp(-ln(2) * t/T1/2)
The Original activity or mass A0 will decay to be A after time t where T1/2 is the decay time or half-life. If you fill in the values for A, A0 and t (= 2 years) you will end up with a value of approximately 188 years for the half-life.
What is the final temperature (in °C) of 120.1 g of water (specific heat = 4.184 J/g･°C) at 24.20°C that absorbed 950.0 J of heat?
i need help someone help me the chem 101 is due tomorrow
From the calculations, the final temperature of the object is 26.1 °C.
What is specific heat capacity?The specific heat capacity is defined as the temperature that is required to raise 1 Kg of a substance through a temperature rise of 1 K.
When;
H = 950.0 J
T1 = 24.20°C
m = 120.1 g
c = 4.184 J/g･°C
T2 = ?
H = mc(T2 - T1)
950 = 120.1 * 4.184(T2 - 24.2)
950 = 502.5T2 - 12160.5
950 + 12160.5 = 502.5T2
T2 = 950 + 12160.5/502.5
T2 = 26.1 °C
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What is the critical angle for the interface between water and diamond?
The critical angle for the interface between water and diamond is 33.4 degrees.
What is the critical angle?The greatest angle at which a ray of light traveling through one transparent medium can hit the border between that medium and a second of lower refractive index.
It strikes the border without being completely reflected within the first medium is called the critical angle in optics.
Thus, the critical angle for the interface between water and diamond is 33.4 degrees.
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HELP HELP HELP HELP
Answer(s):
Template: reactants ⇒ products
1. [tex]Ag+KNO_3[/tex] ⇒ [tex]AgNO_3 + K[/tex]
2. [tex]Zn+AgNO_3[/tex] ⇒ [tex]Zn(NO_3)_2 + Ag[/tex]
3. [tex]Al + H_2SO_4[/tex] ⇒ [tex]Al_2(SO_4)_3 + H_2[/tex]
4. [tex]Cl_2+KI[/tex] ⇒ [tex]HCl + I_2[/tex]
5. [tex]Li + H_2O[/tex] ⇒ [tex]LiOH + H_2[/tex]
6. [tex]Cu + FeSO_4[/tex] ⇒ [tex]CuSO_4 + Fe[/tex]
7. [tex]Na + H_2O[/tex] ⇒ [tex]NaOH + H_2[/tex]
8. [tex]Fe+Pb(NO_3)_2[/tex] ⇒ [tex]Fe(NO_3)_2 + Pb[/tex]
9. [tex]Cu+H_2O[/tex] ⇒ [tex]CuO + H_2[/tex]
10. [tex]Cu+Al_2(SO_4)_3[/tex] ⇒ [tex]CuSO_4 + Al[/tex]
11. [tex]Al + Pb(NO_3)_2[/tex] ⇒ [tex]Al(NO_3)_3 + Pb[/tex]
What is a chemical equation?
A chemical equation consists of the chemical formulas of the reactants (on the left) and the products (on the right). The two are separated by an arrow symbol (“→” usually read aloud as “yields”). Each individual substance's chemical formula is separated from others by a plus sign.
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*: (=' :') this
•.. (,('')('') helped :)
Plutonium-32 has a half-life of 14. 2 days. After 99. 4 days, how much of what was originally a 499. 2 gram sample remains?
The amount of sample of Plutonium-32 which is remained after 99.4 days is 3.9 grams.
How do we calculate the remaining amount?Remaining amount of any substance after the decay will be calculated by using the below equation:
N = N₀[tex](\frac{1}{2})^{\frac{T}{t}}[/tex], where
N = remained quantity = ?
N₀ = original quantity = 499.2g
T = total time = 99.4 days
t = half life time = 14.2 days
T/t = 99.4/14.2 = 7
On putting all these values in the above equation, we get
N = (499.2)(0.5)⁷
N = (499.2)(0.0078) = 3.9g
Hence remaining mass of Plutonium-32 is 3.9 g.
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How much heat is required to change temperature of 10g of water from 4°C to 8°C? (Water has a specific heat of 4.18)?
0 J 167.2 J 165.4 J 160.2 J
Answer: 167.2 J
Explanation: