Answer:
[tex]4.86\times10^{-7}\ \text{m}[/tex]
Explanation:
R = Rydberg constant = [tex]1.09677583\times 10^7\ \text{m}^{-1}[/tex]
[tex]n_1[/tex] = Principal quantum number of an energy level = 2
[tex]n_2[/tex] = Principal quantum number of an energy level for the atomic electron transition = 4
Wavelength is given by the Rydberg formula
[tex]\lambda^{-1}=R\left(\dfrac{1}{n_1^2}-\dfrac{1}{n_2^2}\right)\\\Rightarrow \lambda^{-1}=1.09677583\times 10^7\left(\dfrac{1}{2^2}-\dfrac{1}{4^2}\right)\\\Rightarrow \lambda=\left(1.09677583\times 10^7\left(\dfrac{1}{2^2}-\dfrac{1}{4^2}\right)\right)^{-1}\\\Rightarrow \lambda=4.86\times10^{-7}\ \text{m}[/tex]
The wavelength of the light emitted is [tex]4.86\times10^{-7}\ \text{m}[/tex].
Using the diagram above, answer the following questions:
6. True or False. The arrow labeled C represents a transfer of chemical energy to mechanical energy. Explain why this is true or false. –
7. True or False. The arrow labeled A represents a transfer of solar energy to chemical energy. Explain why this is true or false. –
8. Which arrow or arrows represent a release of carbon dioxide? What process is occurring at the arrow(s) you selected?
9. Which arrow or arrows indicate a process that cycles carbon from living or nonliving organisms? Describe the process or processes you selected.
10. Which arrow or arrows represent reactions that demonstrate a conservation of mass and energy? Explain your answer.
PLEASE HELP!
Answer:
6. false.
chemical energy to heat and mechanical. Mechanical that runs the factory in the photo, and Heat energy that rises up in the atmosphere to join the other carbon
molecules in the air. 7. True. The arrow letter A is the transfer of solar power
from the sun, to a chemical reaction to produce food for the plant, which is
called photosynthesis. The leaves in the plant has chlorophyll that absorbs light
energy and transforms it to food.8. The answer would be letter C and F. C because It is
during the burning of the fossil fuels that the carbon dioxide is release into
the atmosphere. When burning the fossil fuels the carbon that was inside the
fossils is released. This also happens with diesel and other forms of natural
gas. While, F is because plant
respiration releases some of the carbon remains of the photosynthesis. While
plants do absorb carbon dioxide, part of their end product also includes reformed
carbon dioxide. Most of the other processes in the phot uses carbon or absorbs
carbon dioxide to aid their sustenance.9. A carbon cycle for living things would be A or B to F
wherein the plants absorb carbon dioxide to aid their production of food, and
then releasing carbon dioxide again as a by product of their food production.
This also happen to aquatic plants.An example of a non-living carbon cycle would be, D or E to
C. This would be the absorption of the carbon on our sea waters or to our soil,
this then gets trapped in there until it is release like through the forms of
fossil fuel burning.10. The law of conservation of mass and energy states that
matter can neither be created nor destroyed, this is very much evident in the
carbon cycle. Because the carbon from the light energy from the sun, or in our
atmosphere, ends up back to our atmosphere just to continue its cycle. The fact
that the carbon cycle is a cycle not just a linear equation proves that energy
can neither be created nor destroyed.
Explanation:
What carpet Burns in a deficiency of O2 a mixture of CO and CO2 forms.Carbon Burns in excess O2 to form only CO2 and CO Burns in excess O2 to form only CO2. Calculate ΔH for C(graphite +1/2O2) →CO(g).
Answer:
Explanation:
From the combustion of carbon, the reactions occurring in limited oxygen conditions are:
[tex]C(graphite) + \dfrac{1}{2}O_{2(g)} \to CO_{(g)}[/tex]
[tex]C(graphite) + O_{2(g)} \to CO_{2(g)}[/tex]
If it occurs in excess, then any leftover CO changes to CO2. i.e.
[tex]C(graphite) + O_{2(g)} \to CO_{2(g)}[/tex] ---- (1)
[tex]CO_{(g)} + \dfrac{1}{2}O_{(g)} \to CO_{2(g)}[/tex] ----- (2)
From (1), the enthalpy change is:
[tex]\Delta H_{rxn1} = \Delta H^0_{fCO_2(g)} - ( \Delta H^0_{f C(graphite)}+ \Delta H^0_{fCO_2(g)}[/tex]
[tex]\Delta H_{rxn1} =-393.5 \ kJ/mol -(0+0)[/tex]
[tex]\Delta H_{rxn1} =-393.5 \ kJ/mol[/tex]
From (2), the enthalpy change is:
[tex]\Delta_{rxn2} = \Delta H^0_{fCO_2(g)} - ( \Delta H^0_{fCO(g)} + \dfrac{1}{2} \Delta H^0_{fO_2(g)})[/tex]
[tex]\Delta_{rxn2} = -393.5 \ kJ/mol -(-110.5 + \dfrac{1}{2}(0))[/tex]
[tex]\Delta_{rxn2} = -283.0 \ kJ/mol[/tex]
Subtracting (2) from (1), we get:
[tex]C(graphite) + O_{2(g)} \to CO_{2(g)} \ \ \ \Delta H_{rxn} = -393.5 \ kJ/mol}[/tex]
[tex]CO_{(g)} + \dfrac{1}{2} O_2(g) \to CO_{2(g)}} \ \ \ \Delta H _{rxn2} = -283.0 \ kJ/mol[/tex]
[tex]C(graphite) + O_{2(g)} \to CO (g) + \dfrac{1}{2}O_{2(g)} \ \ \ \Delta H_{rxn} = -110.5 \ kJ/mol[/tex]
[tex]C(graphite) + \dfrac{1}{2} O_{2(g)} \to CO (g) \ \ \ \Delta H_{rxn} = -110.5 \ kJ/mol[/tex]
The enthalpy change ΔH of the reaction = -110.5 kJ/mol
the earth's crust is part of which sphere?
Answer:
Lithosphere
Explanation:
The lithosphere is the solid, outer part of the Earth. The lithosphere includes the brittle upper portion of the mantle and the crust, the outermost layers of Earth's structure. It is bounded by the atmosphere above and the asthenosphere (another part of the upper mantle) below.
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Find the volume, in Liters, of 2.5 x 1024 molecules of chlorine gas at STP.
Answer:
V = 93.0 L
Explanation:
Hello!
In this case, when computing the PVT properties for an ideal gas, we need to use the following equation:
[tex]PV=nRT[/tex]
In such a way, for 2.5 x 10²⁴ molecules of chlorine at STP (273.15 K and 1.00 atm) we first need the moles based on the Avogadro's number:
[tex]n = 2.5x10^{24}molec*\frac{1mol}{6.022x10^{23}molec} = 4.15mol[/tex]
Now, we solve for volume on the ideal gas equation to obtain:
[tex]V=\frac{nRT}{P}[/tex]
So we plug in and get:
[tex]V=\frac{4.15mol**0.08206\frac{atm*L}{mol*K}*273.15K}{1.00atm}\\\\V=93.0L[/tex]
Best regards!
why are concerns like safety and recycling important in astronomy
Answer:
Keep the world safe and clean
Explanation:
safety = keep people inline and help them from making bad decisions
clean = keep the world from being polluted or trashy
Astronomy deals with the study of celestial objects such as moon, stars, sun, planets, etc.
Safety is the art of being protected from danger
Recycling is the process of waste conversion. That is, useful materials are generated from wastes.
Astronomers, in their exploration of extraterrestrial bodies, need to ensure that proper measures are taken to ensure their safety in these locations. Unhealthy practices such as deforestation and indiscriminate waste disposal may cause environmental hazards such as global warming. This is a threat to the atmosphere.
Therefore, wastes have to be converted to reusable products to discourage indiscriminate disposals. Hence the importance of the terms "safety" and "recycling" in astronomy.
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Which chemical equations show a precipitation reaction?
Select all the correct answers.
2NaNO3(aq) + NiCl2(aq) → 2NaCl(aq) + Ni(NO3)2(aq)
MgSO4(aq) + CaCl2(aq) → MgCl2(aq) + CaSO4(s)
AlBr3(aq) + 3LiI(aq) → AlI3(aq) + 3LiBr(aq)
FeCl2(aq) + Na2CO3(aq) → FeCO3(s) + 2NaCl(aq)
2AgNO3(aq) + Na2S(aq) → Ag2S(s) + 2NaNO3(aq)
The equations that show a precipitation reaction would be [tex]MgSO_4(aq) + CaCl_2(aq) --- > MgCl_2(aq) + CaSO_4(s)[/tex], [tex]FeCl_2(aq) + Na_2CO_3(aq) --- > FeCO_3(s) + 2NaCl(aq)[/tex], and [tex]2AgNO_3(aq) + Na_2S(aq) --- > Ag_2S(s) + 2NaNO_3(aq)[/tex]
What is a precipitation reaction?It is a reaction in which two soluble salts react in aqueous solutions to form one soluble and one insoluble salt.
Thus, all the equations with an insoluble salt as one of the products will qualify as precipitation reactions. The insoluble is designated as (s).
Hence, the following are precipitation reactions:
[tex]MgSO_4(aq) + CaCl_2(aq) --- > MgCl_2(aq) + CaSO_4(s)[/tex][tex]2AgNO_3(aq) + Na_2S(aq) --- > Ag_2S(s) + 2NaNO_3(aq)[/tex][tex]FeCl_2(aq) + Na_2CO_3(aq) --- > FeCO_3(s) + 2NaCl(aq)[/tex]More on precipitation reactions can be found here: https://brainly.com/question/24158764
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ANYONE CAN HELP ME WITH THIS PLEASE ?
Answer:
0.2g
Explanation:
mass=mole/molar mass
molar mass of oxygen is 32
6.06/32=0.19 or 0.2 units=grams
Number of atoms in 4.5 moles of Au?
The smallest unit of an element, which cannot be broken by any chemical means is called?
atom
compound
element unit
molecule
What is the number of electrons in an atom that has 26 protons and 30 neutrons?
Answer:
26
Explanation:
The number of electrons and protons are equal.
62.4 mL of an HNO3 solution were
titrated with 56.25 mL of a 0.235 M
KOH solution to reach the
equivalence point. What is the
molarity of the HNO3 solution?
The molarity of the HNO₃ solution : 0.212 M
Further explanationGiven
62.4 mL HNO₃
56.25 mL of a 0.235 M KOH
Required
Molarity HNO₃
Solution
Titration formula
M₁V₁n₁=M₂V₂n₂
1= HNO₃, 2 = KOH
n = acid base valence (amount of H⁺/OH⁻ released,for HNO₃ and KOH = 1)
Input the value :
M₁ x 62.4 x 1 = 0.235 x 56.25 x 1
[tex]\tt M_1=\dfrac{0.235\times 56.25\times 1}{62.4\times 1}\\\\M_1=0.212[/tex]
Answer:
0.212
Explanation:
How many moles of each element are in one mole of Sr(HCO,),? (3 points)
O 1 mole of strontium, 1 mole of hydrogen, 1 mole of carbon, 5 moles of O
O1mole of strontium, 2 moles of hydrogen, 2 moles of carbon, 6 moles of O
O 2 moles of strontium, 2 moles of hydrogen, 2 moles of carbon, 5 moles of O
O2 moles of strontium, 2 moles of hydrogen, 2 moles of carbon, 6 moles of O
Answer: 1 mole of strontium, 2 moles of hydrogen, 2 moles of carbon, 6 moles of O
Explanation: i think i’m not sure
A mole corresponds to the mass of a substance that contains particles of the substance.
The concept of moles are used in various ways:-
Chemical equation. Law of constant proportion.
According to the question, the formula required is:-
[tex]n=\frac{Number\ of\ molecules}{na}[/tex]
The Na is defined as the Avogadro constant is the proportionality factor that relates the number of constituent particles in a sample with the amount of substance in that sample.
According to the question, the compound is [tex]Sr(HCO_{3})_{2}[/tex].
Hence the correct option is 2, that is 1 mole of strontium, 2 moles of hydrogen, 2 moles of carbon, 6 moles of oxygen.
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9. Which of these is not a mixture? *
Solution
Alloy
Amalgam
They are all mixtures.
Answer:
They are all mixture
Explanation:
last option
How do you know a substance has dissolved?
it might look like it has disappeared, but in fact it has just mixed with the water to make a transparent
How many grams of H2O are in 34.53 moles of H2O??
Answer:
m=621.54g
Explanation:
number of moles= mass of H2O/molar mass of H2O
n=m/mm
make mass the subject of the formula
m=n*mm
find molar mass of water
H2O=1(16)+2(1)
mm= 18.0g/mol. n=34.53mol
hence, m=34.53mol*18.0g/mol
m=621.54g
ways of preventing rusting
Answer:
Here is your answer......
pleaseeee helpppp thank youu
Answer:
Answer: wellb. a type of gas is evolved ( hydrogen gas )
Which of the following describes hetereogeneous mixture... 1)A mixture that is easily separated, the components are different sixes and unevenly mixed. 2) A mixture that is very difficult to separate, the contents are evenly mixed and the mixture looks like a substance
Answer:
1)A mixture that is easily separated, the components are different sixes and unevenly mixed.
Explanation:
Mixtures are impure substances with usually indefinite composition. Their constituents often retains their identities. They can easily be separated into constituents by physical methods.
Homogenous mixtures have their constituents existing in only one phase.
Heterogeneous mixtures have their constituents existing in at least two different phases.
Heterogenous mixtures are easily separated due to the phase differences of its constituents. They are easily separated by physical processes compared to homogeneous mixtures.Which group in the periodic table contains the three elements with the highest electrical conductivities?
A. Group 8
B. Group 12
C. Group 11
D. Group 7
Answer:
C Group 11
Explanation:
Group 11, by modern IUPAC numbering, is a group of chemical elements in the periodic table, consisting of copper (Cu), silver (Ag), and gold (Au).
These elements show highest electrical conductivity.
Answer:
C Group 11
Explanation:
Group 11, by modern IUPAC numbering, is a group of chemical elements in the periodic table, consisting of copper (Cu), silver (Ag), and gold (Au).
These elements show highest electrical conductivity.
Explanation:
How are molecules built?
Bonding
Atomic Rays
Phase Changes
All of these
Light is a form of _____? A. gamma rays B. sound C. energy D. radio waves
Answer:
Explanation:
Energy
Which symbol can be used to indicate the pressure at which a chemical reaction is carried out?
25°C
OA
2 atm
Pt
Answer:
2 atm
Explanation:
The symbol 'atm' is used for pressure. Hence, the symbol used to indicate the pressure at which a chemical reaction is carried out can be, 2 atm.
QUESTION 3
Identify the number that has 3 significant figures.
O A. 100
OB. 12.0
O C. 120
OD. 123.00
Answer:
D
Explanation:
A sample of g of pure aluminum metal is added to mL of M hydrochloric acid. The volume of hydrogen gas produced at standard temperature and pressure is
Answer:
V = 11.2L are produced
Explanation:
... Sample of 27g of pure aluminium, 3added to 333 mL of 3.0 M HCl..
Based on the chemical reaction:
2Al(s) + 6HCl(aq) → 2AlC₃(aq) + 3H₂(g)
Where 3 moles of hydrogen are produced when 6 moles of hydrochloric acid reacts with 2 moles of Al.
To solve this question, we need to determine limiting reactant converting each reactant to moles. With limiting reactant and the chemical reaction we can find moles of hydrogen and its volume at STP (T=273.15K; P=1atm), thus:
Moles Al-Molar mass: 26.98g/mol-:
27g * (1mol / 26.98g) = 1mol of Al
Moles HCl:
333mL = 0.333L * (3mol/L) = 1mol HCl
For a complete reaction of 1 mole of HCl are required:
1mol HCl * (2mol Al / 6mol HCl) = 0.333 moles of Al. As there is 1 mole of Al, Al is in excess and HCl is limiting reactant.
Moles of Hydrogen produced are:
1mol HCl * (3 moles H₂ / 6 mol HCl) = 0.5moles H₂ are produced.
Using ideal gas law:
PV = nRT
V = nRT/P
Where V is volume
n are moles: 0.5mol
R is gas constant: 0.082atmL/molK
T is absolute temperature: 273.15K
P is pressure: 1atm.
Solving for V:
V = 0.5mol*0.082atmL/molK*273.15K / 1atm
V = 11.2L are producedCompare the orbital notations of the substances investigated in this experiment with their attraction to the magnet. What unique feature in the orbital notation could be used to predict an attraction to a magnet
Answer:
Number of unpaired electrons
Explanation:
We know that for the compounds listed, the nature of the electrons in the d orbitals affects their interaction with an applied magnetic field.
If there are unpaired d electrons present, the compound is paramagnetic and is more strongly attracted to a magnetic field.
Similarly, if there are paired d electrons, the compound is diamagnetic and is less strongly attracted to a magnetic field.
When baking soda and vinegar react, the surface bubbles. What does this most likely indicate?
a chemical change, because a precipitate is being formed
a chemical change, because a gas is being formed
a non chemical change, because a precipitate is being formed
a non-chemical change, because a gas is being formed
Answer: B
a chemical change, because a gas is being formed
Explanation:
Answer:
B
Mark Brainliest please
Explanation:
How many protons, neutrons, and electrons does Si^4-
Answer:
Silicon has 14 protons, 14 neutrons, and 14 electrons.
Explanation:
How can you identify a redox reaction?
O A. The number of protons has changed in an atom.
O B. Electrons have transferred from one atom to another.
O C. The charges on each side of the equation cancel.
O D. Metal atoms have rearranged in the compounds.
SUBMIT
PREVIOUS
Answer: The Correct Answer is Choice B.
Explanation: I just took the quiz.
ANSWER:
B. Electrons have transferred from one atom to another.
EXPLANATION:
An oxidation-reduction (redox) reaction is a reaction which involves the change in oxidation number of the atoms involved. Since the oxidation number changes, this means that one atom has to lose electrons and another has to accept electrons. The reactant that loses electrons is called REDUCING AGENT while the reactant that gains electrons is called OXIDIZING AGENT.
For example, in a reaction between iron and oxygen as follows:
4Fe+ 3O2→2Fe2O3
Iron is reduced from +2 to 0 because it accepts electrons from oxygen while oxygen is oxidized from -2 to 0 because it transfers electrons to iron.
Hence, a redox reaction can be identified by the transfer of electrons from one atom to another.
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magnesium nitrate is a strong electrolyte. Write the transformation that occurs when solid magnesium nitrate
The question is incomplete, the complete question is;
The compound magnesium nitrate is a strong electrolyte. Write the reaction when magnesium nitrate is put into water:
Answer:
Mg(NO3)2(s)--------->Mg^2+(aq) + 2NO3^-(aq)
Explanation:
When we say that a compound is a strong electrolyte, we mean that that the compound dissociates completely in solution to form its ions.
This means that all strong electrolytes attain 100% dissociation of the solid in water according to its stoichiometric equation.
For magnesium nitrate, the reaction equation is;
Mg(NO3)2(s)--------->Mg^2+(aq) + 2NO3^-(aq)
What Is an example of weather?
A. The average rainfall in Arizona over the pervious three months
B. The increase in temperature over North America over the past decade
C. The time for high tide in Daytona Beach today
D. The temperature and wind speed in Philadelphia today
