Answer:
[tex]\mathbf{\lambda = 1.01 \times 10^{3} \ nm}[/tex]
Explanation:
To determine the wavelength; let's first calculate the energy (E) change of the transition by using the Rydberg constant [tex](R_H)[/tex]
[tex]\Delta E = R_H ( \dfrac{1}{n_i^2}- \dfrac{1}{n_f^2})[/tex]
[tex]\Delta E = 2. 18 \times 10^{-18} \ J ( \dfrac{1}{7^2}- \dfrac{1}{3^2})[/tex]
[tex]\Delta E = 1.977 \times 10^{-19 } \ J[/tex]
Now; to calculate the wavelength by using the formula:
[tex]\lambda = \dfrac{c*h}{\Delta E}[/tex]
[tex]\lambda = \dfrac{(3.00 \times 10^8 \ m/s) *(6.63 \times 10^{-34} \ J.s)}{1.977 \times 10^{-19 } \ J}[/tex]
[tex]\lambda = 1.01 \times 10^{-6} \ m[/tex]
To nanometers; we have:
[tex]\lambda = 1.01 \times 10^{-6} \ m \times \dfrac{1 \ nm}{ 1 \times 10^{-9} \ m}[/tex]
[tex]\mathbf{\lambda = 1.01 \times 10^{3} \ nm}[/tex]
How does rust form?
a. Through paint flaking off of a metal surface
b. Through a chemical reaction between iron and oxygen c. Through weathering
d. Through the physical mixing of iron and wa
Answer:
B. Through a chemical reaction between iron and oxygen
*
Malleability refers to the ability of a metal to...
be drawn into a wire
conduct electricity
be melted down to create alloys
O be hammered into shapes
Answer:
It would be to be hammered into shapes because malleability is how flexible a metal is.
Jill has decided that she wants to start conserving gasoline Jill is considered about the rising price of gas as well as by products from gas engines pollute the atmosphere what solution would help Jill solve this problem
A). deciding to drive her Carla until the price goes down
B). Deciding to ride her bicycle from work Instead of driving
C). Deciding to use premium unleaded instead of regular unleaded gasoline
D) Deciding to move to a city where smog from automobiles is not a problem
Answer:B
Explanation:
It is
According to law of conservation of energy and usage of renewable resources Jill should decide to ride her bicycle from work instead of driving.
What is law of conservation of energy?According to the law of conservation of energy, it is evident that energy is neither created nor destroyed rather it is restored at the end of a chemical reaction .
Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.
Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Julius Robert Mayer in the year 1842.
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Help!!! A radio station transmits its signal at 93.1 MHz. What is the wavelength signal ?
Answer:
3.22m
Explanation:
c=3×10^8m/s=speed of the light
lambda= wavelength=?
frequency=?
lambda=c÷frequency
lambda=(3×10^8)÷(93.1×10^6)
lambda=3.22m
The second-order reaction CH3CHO→CH4+CO has the reaction constant k of 6.73×10−5 L/mol s. If the initial concentration of CH3CHO is 0.551 mol/L, what is the concentration of CH3CHO after 45.0 seconds? Your answer should have 3 significant figures (three decimal places).
Answer:
[tex][CH_3CHO]=0.550M[/tex]
Explanation:
Hello.
In this case, since the rate law for this chemical reaction would be:
[tex]r=\frac{d[CH_3CHO]}{dt} =-k[CH_3CHO]^2[/tex]
The integrated rate law after its demonstration is:
[tex]\frac{1}{[CH_3CHO]} =kt+\frac{1}{[CH_3CHO]_0}[/tex]
Thus, for the given rate constant, initial concentration of CH3CHO and elapsed time, the resulting concentration is:
[tex]\frac{1}{[CH_3CHO]} =6.73x10^{-5}\frac{L}{mol*s}*45.0s +\frac{1}{0.551mol/L}\\\\\frac{1}{[CH_3CHO]}=3.03x10^{-3}L/mol+1.81L/mol[/tex]
[tex]\frac{1}{[CH_3CHO]} =1.82L/mol[/tex]
[tex][CH_3CHO]=0.550M[/tex]
Best regards!
helpp pls anything helpsss
Answer:go in the order from top to bottom.
Ammonium chloride= NH2Cl
chlorideIron(III) nitrate=Fe(NO3)3
Titanium(III) bromide=TiBr3
Copper(I) phosphide=Cu3P
Tin(IV) Selenide=SnSe2
Gallium arsenide=GaAs
Lead(II) sulfate=Pb(SO4)3
Beryllium Hydrogen Carbonate=Be(HCO3)2
Manganese(III) Sulfite=Mn2(SO3)3
Aluminium cyanide Al(CN)3.
The atoms of which element will gain electrons to form an ion?
A. mercury
B. bromine
C. beryllium
D. potassium
The temperatures on the inside and outside surface of a wall are 20°C and 5°C respectively. The wall is 8 m wide, 4 m high, and 0.2 m thick.
The thermal conductivity is 0.3 W/m.K.
1
The heat flux through the wall is negative
W/m2. Use two significant figures in your answer.
Answer:
Heat Flux = - 22.5 W/m²
Explanation:
We can use Fourier's Law of Heat Conduction:
q = -kAΔT/t
q/A = -KΔT/t
where,
q/A = Heat Flux = ?
K = Thermal Conductivity = 0.3 W/m.K
ΔT = Change in Temperature = 20°C - 5°C = 15K
t = Thickness = 0.2 m
Therefore,
Heat Flux = -(0.3 W/m.k)(15 k)/(0.2 m)
Heat Flux = - 22.5 W/m²
Negative sign shows the heat flowing out of the system.
20 POINTSSSS!!!!!!!!!!!
WHAT IS THE COLORS NOT THE GASES THE COLORS OF AN PLASMA BALL?
blue, red, and white colors.
Explanation:
→Blue→Red →WhiteYour AnswerGroup 17 elements form A. +1 ion B. -1 ion C. +7 ion D. -7 ion
Answer:
B
Explanation:
Use your periodic table to find out the charge on a Fl ion if your periodic table is constructed that way. In any event, the charge on Fl when it becomes an ion is -1. I don't think it has any other charge. So all of the elements in column 17 will have at least -1 in common.
How are ions made from neutral atoms?
Why?
O KATIE
yes
-
no
You have learned that not all atoms of an element are the same. Variation in the number of neutrons
results in different isotopes of the element. In this activity we will explore another variation that can take
place—the loss and gain of electrons. The exchange of electrons between atoms is a very common way for
chemical change to take place. We will see it many times throughout the year.
1. Use Model 1 to complete the following table.
see p. 2 for the model
Is the number of Is the number of Is the number of
Metal or protons the same panteons the same electrons the same
Charge
on the
Nonmetal in the atom in the atom in the atom
ion
and the ion? and the ion? and the ion?
Lithium
metal
no
1+
Magnesium
2+
Aluminum
yes
3+
Fluorine
1-
Oxygen nonmetal
Nitrogen
3-
2. Based on the table you completed in Question 1, what distinguishes a neutral atom from an ion?
Circle choice
Protons
Electrons
3. Examine the isotope symbols in Model 1.
a. Where is the ion charge located in the stope symbol?
Circle 2 choices: Top OR bottom + Left OR Right
be Is a charge indicated on the neutral atoms? If yes, where is it located?
No, charge is not indicated on an atom, because it is neutral
4. Which subatomic particle carries a positive charge?
no
2-
Inmut
Answer:
They can be turned into positive ions.
Explanation:
neutral atoms can be turned into positively charged ions by removing one or more electrons. Atoms that gain extra electrons become negatively charged. A neutral chlorine atom, for example, contains 17 protons and 17 electrons . By adding one more electron we get a negatively charged Ion with a net charge of negative 1
Assign the oxidation states of all the atoms in each of the following compounds. a) H2CrO4 b) H2SO4 c) K2Cr2O7 d) HNO3 e) Cr2O7 2
Answer:
(a) H = +1, Cr = +6, O = -2
(b) H = +1, S = +6, O = -2
(c) K = +1, Cr = +6, O = -2
(d) H = +1, N = +5, O = -2
(e) Cr = +6, O = -2
Explanation:
(a)
In H₂CrO₄
The oxidation state of Hydrogen (H) is +1
The oxidation state of Oxygen (O) is -2
To find the oxidation state of Cr,
Let the oxidation state of Cr be x
Then, (+1×2) + x + (-2×4) = 0
2+x-8 = 0
x = +6
Hence, oxidation state of Cr is +6
(b)
In H₂SO₄
The oxidation state of Hydrogen (H) is +1
The oxidation state of Oxygen (O) is -2
To find the oxidation state of Sulphur (S),
Let the oxidation state of Sulphur be x
∴ Then, (+1×2) + x + (-2×4) = 0
2+x-8 = 0
x = +6
Hence, the oxidation state of S is +6
(c)
In K₂Cr₂O₇
The oxidation state of Potassium (K) is +1
The oxidation state of Oxygen (O) is -2
To find the oxidation state of Chromium,
Let the oxidation state of Chromium be x
Then, (+1 ×2) + (x ×2) + (-2×7) = 0
+2 +2x -14 = 0
2x = +12
x = +6
Hence, the oxidation state of Chromium is +6
(d)
In HNO₃
The oxidation state of Hydrogen (H) is +1
The oxidation state of Oxygen (O) is -2
To find the oxidation state of NItrogen (N),
Let the oxidation state of Nitrogen be x
+1 + x + (-2×3) = 0
1 +x - 6 = 0
x = +5
Hence, the oxidation state of Nitrogen is +5
(d)
In Cr₂O₇²⁻
The oxidation state of Oxygen is -2
To the oxidation state of Chromium (Cr(,
Let the oxidation state of Chromium be x
Then, (2×x) + (-2×7) = -2
2x - 14 = -2
2x = +12
x = +6
Hence, the oxidation state of Chromium is +6
How much aluminum can be produced from 5.00 ton of Al2O3?
Answer:
Almost to exactly .5 tons
Explanation:
5 tons of Aluminum oxide will produce, 2.64 tons of Aluminum.
In a mole of aluminum oxide, the total extraction will yield 2 atoms of aluminum.
Thus, 102 grams (1 mole) of aluminum oxide will give 54 grams of aluminum.
In terms of kg:
0.102 kg aluminum oxide = 0.054 kg Aluminum
5 tons aluminum oxide = 4535.92 kg of aluminum oxide
Since, 0.102 kg aluminum oxide = 0.054 kg aluminum
4535.92 kg of aluminum oxide = [tex]\rm \dfrac{0.054}{0.102}\;\times\;4535.92[/tex] kg of aluminum
4535.92 kg of aluminum oxide = 2401.37 kg of Aluminum
2401.37 kg Aluminum = 2.64 ton of Aluminum.
Thus, 5 tons of Aluminum oxide will produce, 2.64 tons of Aluminum.
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Calculate the energy of a photon from an FM radio station at a frequency of 101.5 MHz. Express the answer in scientific notation. Use the caret symbol (^) before the exponent. Use an x for the times sign. Include correct unit(s). Pay attention to sig figs. Space things normally and consistently. *
Answer:
[tex]E=6.7\times 10^{-26}\ J[/tex]
Explanation:
Given that,
The frequency of an FM radio station is 101.5 MHz i.e. [tex]101.5\times 10^6\ Hz[/tex]
The energy of a photon is given by :
[tex]E=h\nu[/tex]
Where
h is Planck's constant
[tex]E=6.63\times 10^{-34}\times 101.5\times 10^6\\\\E=6.72\times 10^{-26}\ J[/tex]
or
[tex]E=6.7\times 10^{-26}\ J[/tex]
So, the energy of the photon is [tex]6.7\times 10^{-26}\ J[/tex]. Hence, this is the required solution.
HELP ME For which orbital are the values of the quantum numbers as
follows: n = 2, 1 = 1, m = -1,0, +1 ?
Answer: 2p..........................
Answer:
2p
Explanation:
If you help me i will give bra1niest. Guaranteed
Answer:lll
I looked and lll is the only one that wont make since so it’s lll
A photon of red light has wavelength 750 nm, a photon of
green light has wavelength 615 nm and a photon of violet light
has wavelength 420 nm. Which of the following radiations
has/have higher frequency?
Answer:
violet light
Explanation: ck12 says so
A friend uses an analogy of raisins in rising bread dough to describe galaxies in the expanding universe. Is your friend’s analogy strong? Explain.
An atom of tin becomes an cation when it forms an ionic bond with four atoms of chlorine. What is the charge
on the tin ion?
4-
4+
2-
2+
Explanation:
as it is cation so 4+
it loses four electron
A chemist determines by measurements that 0.030 moles of hydrogen gas participate in a chemical reaction. Calculate the mass of hydrogen gas that participates. Be sure your answer has the correct number of significant digits.
Answer:
0.060 g
Explanation:
Hydrogen gas is made up of 2 atoms of hydrogen [tex]H_2(g)[/tex].
From the formula for calculating mole:
mole = mass/molar mass
Molar mass of hydrogen gas = 2.016 g/mol
Hence, 0.030 mole hydrogen gas would weigh:
mass = molar mass x mole
= 2.016 x 0.030
= 0.06048 g
The mass of hydrogen gas that participated to the correct number of significant digits is, therefore, 0.060 g
What is A Chemical Bond- ASAP!
Answer:
B.
Explanation:
A chemical bond holds together attractions of atoms
I need help with the second one
Sorry, your photo isn't clear enough.
An atom of antimony has a mass number of 122. The atomic number of antimony is 51. Calculate the number of protons and neutrons in this atom – work must be shown to earn credit.
Answer:
The number of protons and neutrons of antimony is 51 and 71 respectively.
Explanation:
We have for antimony:
A: mass number = 122
Z: atomic number = 51
The atomic number is equal to the number of protons, hence the antimony has 51 protons.
The mass number is:
[tex] A = Z + N [/tex]
Where:
N: is the number of neutrons
Then, the number of neutrons is:
[tex] N = A - Z = 122 - 51 = 71 [/tex]
Therefore, the number of protons and neutrons of antimony is 51 and 71 respectively.
I hope it helps you!
What happens when a high pressure system goes towards a low pressure system?
Suppose you mix 100.0 g of water at 23.0 oC with 75.0 g of water at 75.7 oC. What will be the final temperature of the mixed water, in oC? Type answer:
Answer:
Explanation:
Let final temperature be T.
Heat lost by hot water
mass x specific heat x fall in temperature
75 x s x ( 75.7 - T )
Heat gained by cool water
= 100 x s x ( T - 23 )
heat lost= heat gained
75 x s x ( 75.7 - T ) = 100 x s x ( T - 23 )
5677.5 - 75 T= 100 T- 2300
175 T= 7977.5
T = 45.6⁰C .
The final temperature of the mixed water is 45.6 ⁰C.
The given parameters;
mass of the cold water, m = 100 ginitial temperature of the water, t₁ = 23 ⁰Cinitial temperature of the hot water, t₂ = 75.7⁰ Cmass of the hot water = 75 gspecific heat capacity of water is 4.184 J/g⁰CThe final temperature of the mixture is calculated as follows;
Based on the principle of conservation of energy;
Heat lost by hot water = heat gained by the cold water
mcΔθ₂ = mcΔθ₁
75 x 4.184 x (75.7 - T) = 100 x 4.184 x (T - 23)
75 x (75.7 - T) = 100 x (T - 23)
(75.7 - T) = 1.333(T - 23)
75.7 - T = 1.333T - 30.659
75.7 + 30.659 = 1.333T + T
106.359 = 2.333T
[tex]T = \frac{106.359}{2.333} \\\\T = 45.6 \ ^0C[/tex]
Thus, the final temperature of the mixed water is 45.6 ⁰C.
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An ideal gas is confined to a 10.0-L balloon at STP. What is
the new volume of the balloon when it is placed under
800. mmHg at 100°C?
Answer:
[tex]V_2= 13.0L[/tex]
Explanation:
Hello.
In this case, we can consider this problem related to ideal gases which are those that are not attracted or repulsed to each other, and can be studied via the ideal gas equation:
[tex]PV=nRT[/tex]
Thus, since we have two conditions and the moles of the gas have not changed, we can write:
[tex]\frac{P_1V_1}{T_1}= \frac{P_2V_2}{T_2}[/tex]
Because the initial conditions for 10.0 L of the gas are 1 atm and 273.15 K (STP) and the final conditions are 800 mmHg (1.053 atm), so the new volume is:
[tex]V_2=\frac{P_1V_1T_2}{T_1P_2}=\frac{1atm*10.0L*373.15K}{273.15K*1.053atm}\\\\V_2= 13.0L[/tex]
Best regards!
When the balloon placed under 800. mmHg, the new volume will be "13.0 L".
Ideal gas equationAccording to the question,
Pressure, P₁ = 1 atm
P₂ = 1.053 atm
Temperature, T₁ = 273.15 K
T₂ = 373.15 K
Volume, V₁ = 10.0 L
By using the Ideal gas equation,
→ PV = nRT
or,
→ [tex]\frac{P_1 V_1}{T_2} = \frac{P_2 V_2}{T_2}[/tex]
Then,
The new volume be:
→ V₂ = [tex]\frac{P_1 V_1 T_2}{T_1 P_2}[/tex]
By substituting the above values,
= [tex]\frac{1\times 10.0\times 373.15}{273.15\times 1.053}[/tex]
= 13.0 L
Thus the approach above is right.
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How much heat is required to change 150.0 g of water from 21.0 °C to 45.0°C
Answer:
When it asks how much heat it is required to change the temperature then it is called specific heat capacity, and when it says how much heat required TO CHANGE THE STATE then it is latent heat so here we will do by formula of
Q = mcT
where q is heat
m is mass
T is change in temperature which is going to be 24 here
put all the values you will get the answer
HOPE IT HELPS!
What are the three categories of carbohydrates in
food ingredients?
Answer:
1. simple carbohydrates or simple sugars such as table sugar and the sugar in milk, 2. complex carbohydrates such as starches and 3. dietary fiber.
Explanation:
What are some things that you can do to reduce your impact on desertification?
Answer:
Planting more trees - the roots of trees hold the soil together and help to reduce soil erosion from wind and rain.
Improving the quality of the soil - this can be managed by encouraging people to reduce the number of grazing animals they have and grow crops instead. The animal manure can be used to fertilise the crops grown. Growing crops in this way can improve the quality of the soil as it is held together by the roots of plants and protected from erosion. This type of farming is more sustainable.
Water management - water can be stored in earth dams in the wet season and used to irrigate crops during the dry season. This is an example of using appropriate technology to manage water supplies in the desert environment.
Explanation:
7th grade Science pls help
Answer:
I think its a compound : )