Answer:
the correct answer is A
Explanation:
I took the test!
Answer:
A probably because its ionic
Here's the question ~
Heat treatment of muscular pain involves radiation of wavelength of about 900 nm (nm = 10-⁹ m). which spectral line of H - atom is suitable for this purpose ?
[ RH = 1 × 10⁵ cm-¹ ]
[ h = 6.6 × 10-³⁴ Js ]
[ c = 3 × 10⁸ m/s ]
Thanks for Answering !
Using the Rydberg formula, the spectral line of H - atom is suitable for this purpose is Paschen, ∞ → 3.
Using the Rydberg formula;1/λ = RH(1/nf^2 - 1/ni^2)
Given that;
λ = wavelength
RH = Rydberg constant
nf = final state
ni = initial state
When final state = 3 and initial state = ∞Then;
1/λ = 1 × 10^7 m-1 (1/3^2 - 1/ ∞^2)
1/λ = 1 × 10^7 m-1 (1/3^2 )
λ = 900 nm
Hence, the correct answer is Paschen, ∞ → 3
Learn more about the Rydberg formula; https://brainly.com/question/17753747
Explain two ways to restore the Florida Panther population.
Answer:
Explanation: encourage your legislators to support land acquisition programs such as Florida Forever and the Rural and Family Lands Protection Program.
Find the volume of hydrogen gas that reacts with 200 cm of nitrogen gas
measured at the same temperature and pressure.
N2 + 3H2(g) 2NH3(g)
Answer:
15 L
Explanation:
The important thing to remember about reactions that involve gases kept under the same conditions for pressure and temperature is that the mole ratios that exist between the gases are equivalent to volume ratios.
This can be proven using the ideal gas law equation for two gases kept at a temperature
T
and a pressure
P
.
P
⋅
V
1
=
n
1
⋅
R
⋅
T
→
the ideal gas law equation for the first gas
P
⋅
V
2
=
n
2
⋅
R
⋅
T
→
the ideal gas law equation for the second gas
Divided these two equations to get
P
⋅
V
1
P
⋅
V
2
=
n
1
⋅
R
⋅
T
n
2
⋅
R
⋅
T
This means that you have
n
1
n
2
=
V
1
V
2
→
the mole ratio is equivalent to the volume ratio
In your case, the balanced chemical equation looks like this
N
2(g]
+
3
H
2(g]
→
2
NH
3(g]
The problem tells you that this reaction takes place at constant temperature and pressure. You don't need to know the exact values, you just need to know that they are constant for all three chemical species.
You can thus say that since you have a
1
:
3
mole ratio between nitrogen gas and oxygen gas, you will also have a
1
:
3
the volume ratio between these two gases
n
N
2
n
H
2
=
V
N
2
V
H
2
=
1
3
The volume of hydrogen gas needed to react with that much nitrogen gas will thus be
5.0
L N
2
⋅
3
L H
2
1
L N
2
=
15 L H
2
nomenclature of this compound
spammers will be reported
Answer:
Nomenclature is the process of naming chemical compounds with different names so that they can be easily identified as separate chemicals. ... For example, organic compounds include molecules with carbon rings and/or chains with hydrogen atoms (see picture below).01-Jul-2014
Nomenclature: Iron (II) Chloride
Compound: FeCl2
Rank the following in terms of increasing ionization energy: Sulfur, oxygen, hydrogen, and fluorine.
Answer:
Ranked from lowest to highest:
Sulfur - 999.6 kJ/mol
Hydrogen - 13.5984 kJ/mol
Oxygen - 13.6181 kJ/mol
Fluorine - 17.4228 kJ/mol
A nuclear _ is a large chamber where fuel rods are located
The answer is going to be a nuclear reactor
2.3g of sodium metal is burned completely in oxygen of air.
(Na =23, O =16, at STP : 32g of O2 has 22.4L)
Find mass of the obtained oxide?
Find volume of the required air?
Answer:
mass of Na2O= 3.1 grams
volume of O2= 0.56 L
Explanation:
First what you need to do is establish the balanced equation for the reaction that they're giving you. In this case would be:
4Na + O2 > 2Na2O
And then, you can read the stequiometry of the reaction:
4 moles of Na react with one mole of oxygen to produce 2 moles of sodium oxide.
So now you know that you have 2.3 grams of sodium so you have to obtain the quantity of moles that are present in 2.3 grams of sodium. The molar mass the (the grams by which you will have exactly one mole) so all you have to do is divide 2.3g ÷ 23g/mol= 0.1 mol
So here you have 0.1 mol of sodium, and you know for a fact that for each 4 moles of sodium, one mole of oxygen reacts, so you simply divide the quantity of moles of sodium you have by the 4 moles of oxygen present in the balanced equation.
0.1 moles ÷ 4 moles = 0.025.
So for each 0.1 moles of sodium that react, 0.025 moles of Oxygen react.
Now what you need to do is to find the limitant reactor (the reactor that's according to the comparison to the balanced equation is in a smaller ratio to the other element, that would be in excess.
In this case, both elements are in a ratio that respects the balanced equation so neither of them is in excess or is limitant.
Now, to determine the amount of Na2O, you simply know that one mole of oxygen react to produce to moles of sodium oxide, So all you have to do is establish the factor of conversion:
0.025 moles O2 x 2 moles Na2O/ 1 mol O2= 0.05 moles of Na2O
Then you convert that to grams by multiplying 0.05 by the molar mass of Sodium oxide and it will be:
0.05 mol Na2O x 62 g/mol= 3.1 grams of Na2O
Now what you need to do is find the volume by which O2 is reacting in the reaction so you can use the equation of the ideal gas law.
PV=nRT at standard temperature and pressure (273 K and 1 Atm)
P=Pressure
V=Volume
n=Number of atoms
R=constant of gases (0.082 Atm L/ mol K)
T=Temperature
V=nRT/P (because you need to find the volume)
V= (0.025 mol)(0.082)(273 K)/1 atm
V=0.56 L
And there you go :)
What is the mass number (A) of an atom that has an atomic number (Z=26) with 29 neutrons and 26 electrons?
Atom information–
Atomic number (Z) = 26Protons (p⁺) = 26Neutrons (n⁰) = 29Electrons (e⁻) = 26The atomic number (Z) of an atom is the number of protons (p⁺) it hasThe mass number (A) of an atom is characterized by the sum of the amount of protons (p⁺) with its neutrons (n⁰)Substituting values –
[tex]\qquad[/tex] [tex]\twoheadrightarrow\bf A=p^{+}+n^{0}[/tex]
[tex]\qquad[/tex] [tex]\twoheadrightarrow\bf A=26+29[/tex]
[tex]\qquad[/tex] [tex]\twoheadrightarrow\bf A=55[/tex]
____________________________________________
If 48.3g of iron is completely rusted in oxygen to produce 62.5g of iron (III) oxide, how many grams of oxygen are involved in the reaction?
The amount of oxygen involved in the reaction would be 20.7 g
The equation of rusting of iron is as follows:
[tex]4Fe + 3O_2 ---> 2Fe_2O_3[/tex]
The mole ratio of Fe to O2 is 4:3.
Mole of 48.3 g Fe = mass/molar mass
= 48.3/56
= 0.8625 moles
Equivalent mole of O2 = 0.8625 x 3/4
= 0.6469 moles
Mass of 0.6469 moles O2 = mole x molar mass
= 0.6469 x 32
= 20.7 g
More on stoichiometric calculations can be found here: https://brainly.com/question/8062886?referrer=searchResults
how much percent of water should we add to sea water to change concentration from 3 to 2
Answer:
10 kg of water was added to the 20 kg of seawater to dilute it from 3% to 2%. Hope this helps!!!!!!
5. What is a chemical equation? What are the essentials of a chemical equation? What information is conveyed by a chemical equation? What are its limitations and how are they removed?
Answer:
A chemical equation is the symbolic representation of a chemical reaction in the form of symbols and formula. (i) It must refer to an actual chemical reaction. (ii) It should be molecular. For example, H, O, N should be written as H2, O2, N2. (iii) It should be balanced and conform to the law of conservation of matter.A chemical equation conveys both qualitative and quantitative information. Qualitatively, a chemical equation tells the names of the various reactants and the products.
21. Which of the following is the best way to clean up an acid spill?
A. Wash down the acid spill with plenty of water.
B. Wipe up the acid spill with paper towel.
C. Spread sawdust on the acid spill to absorb it.
D. Neutralize the acid spill with a base; then wash it with plenty of water.
T1
giving brainliest, more chemistry questions being uploaded
Answer:
We have the atoms, and we have the molar mass of Vanadium (listed in the periodic table) which should be 50.94g/mol.
The first step is to convert the 4.18 x 10^23 atoms into moles by dividing the atoms by Avogadro's number (6.02 x 10^23)
(4.18 x 10^23)/(6.02 x 10^23) = 0.694 moles
Now we know that moles is equal to the mass divided by the molar mass. So now that we have the moles and the molar mass of Vanadium, we can rearrange the equation to find mass. Once you have rearranged it, you have to multiply the moles by the molar mass.
So 0.694 moles x 50.94g/mol = 35.35g of V
What is the noble gas notation of Titanium in the ground state?
Look at the diagram below. What type of bond does it show?
Explanation:
it shows covalent bonds
The type of bond the diagram shows is covalent bond. As shown the sharing of electrons in the diagram.
What are bonds?Bonds are defined as any of the interactions that lead to atoms joining together to form molecules, ions, crystals, and other stable species that make up the familiar materials found in everyday life. The ability to build molecules is made possible by a chemical bond, which is a strong attraction between atoms, ions, or molecules. Chemical bonds that hold molecules together also form temporary connections vital for life.
Covalent bond are defined as a type of chemical link where atoms share electrons to create electron pairs. Low melting and boiling temperatures, low vaporization heat, low water solubility, and poor conductivity are four characteristics of covalent compounds.
Thus, the type of bond the diagram shows is covalent bond. As shown the sharing of electrons in the diagram.
To learn more about bonds, refer to the link below:
https://brainly.com/question/13559044
#SPJ2
good and bad effects of changes in materials in the environment
Answer:
Composting, recycling, technological development, water cycle and photosynthesis are changes that have good effects. Some changes have bad effect like pollution and destruction of habitat and lose of lives.
Explanation:
hope it helps
why are earthquakes different in New Madrid than in California.
nomenclature of this compound
Answer:
Nomenclature is the process of naming chemical compounds with different names so that they can be easily identified as separate chemicals. Inorganic compounds are compounds that do not deal with the formation of carbohydrates, or simply all other compounds that do not fit into the description of an organic compound.
Explanation:
select the best explanation for why methanol, ch3oh, cannot be used as a solvent for the deprotonation of a terminal alkyne by sodium amide, nanh2.
Answer:
d. Methanol is more acidic than the alkyne and will be deprotonated instead.
Explanation:
because acidity is the ability to lose H+, leaving an anion behind; acidity depends on the stability of the anion.
Speed is the rate of change of position expressed as _____ traveled per unit of time.
Answer:
distance traveled per unit of time.
Answer the following questions.
P1) Matching.
Complete the table with the data from the lab. First, calculate and enter the mole ratio in the chart, then enter the volumes of the precipitates.
The mole ratio can be seen below and the volume of each precipitate is 60 mL.
A mole ratio refers to a conversion factor that compares the quantities of two chemicals in moles in a chemical laboratory experiment.
Mole ratio For 1:
= 10 mL : 50 mL= 1 : 5 mLMole ratio For 2:
15 mL : 45 mL= 1 : 3 mLMole ratio For 3:
20 mL : 40 mL1 : 2 mLMole ratio For 4:
30 mL : 30 mL1 mL : 1 mLMole ratio For 5:
40 mL : 20 mL2 : 1 mLMole ratio For 6:
45 mL : 15 mL3 : 1 mLMole ratio For 7:
50 mL : 10 mL5 : 1 mLSince the parameters from the left side of the diagram are not shown, we will assume that the volumes for each precipitate are the addition of both volumes in each column.
By doing so, we have:
1.
(10 +50) mL = 60 mL2.
(15 + 45) mL = 60 mL3.
(20 + 40)mL = 60 mL4.
(30 + 30) mL = 60 mL5.
(40 + 20)mL = 60 mL6.
(45 + 15) mL = 60 mL7.
(50 + 10)mL = 60 mLLearn more about mole ratio here:
https://brainly.com/question/19099163
True or False? The energy carried by a sound
wave is blocked by collisition
between the particles in the
material the name is traveling
in
Answer:
true
Explanation:
i checked on moogle
Kingdom:
Domain:
I am made of many cells. My cells have
an organized nucleus, I have two
parents and eat food.
Guess Who?
please help
Answer:
SORRY IM LATE! at least i saw it.
Explanation:
Kingdom is Eucaryota
domain is eucarya
PLEASE HELP
When an electron in a hydrogen atom drops from the fifth energy level to the second energy level 4.58 x 10-19 J of energy is released What is the frequency of the photon that is produced?
Answer:
e=hf conversion
hope it helps! stay safe as always!
Formulate a hypothesis based on something recently observed.
And How could this hypothesis be tested?
Answer:
If garlic repels fleas, then a dog that is given garlic every day will not get fleas. Bacterial growth may be affected by moisture levels in the air. If sugar causes cavities, then people who eat a lot of candy may be more prone to cavities.
Explanation:
Find the molecular formula of ethylene glycol, used in antifreeze, if its empirical formula is CH3O and its molar mass is 62 g/mol.
The molecular formula of the ethylene glycol is C₂H₆O₂.
From the question given above, the following data were obtained:
Empirical formula = CH₃O Molar mass of compound = 62 g/mol Molecular formula =?Molecular formula = empirical × n = molar mass
[CH₃O]n = 62
[12 + (3×1) + 16]n = 62
31n = 62
Divide both side by 31
n = 62 / 31
n = 2
Molecular formula = [CH₃O]n
Molecular formula = [CH₃O]₂
Molecular formula = C₂H₆O₂
Learn more about empirical and molecular formula: https://brainly.com/question/25820990
15 POINTS AND BRAINLIEST
Martin hooked up the following circuit. He noticed that the light did not turn on. How could he fix the circuit to make it work?
A. Martin needs to have one wire coming from one side of the battery to the light bulb and one wire coming from the other side to the switch. To make a closed circuit, he can use a wire to connect the switch to the light bulb.
B. Martin needs to connect one wire from the switch to the battery and one wire from the battery to the light bulb. When he does this, it will be a closed circuit that allows electricity to flow.
C. Martin needs to turn the battery around. When he does this, it will become a closed circuit allowing electricity to flow through the circuit in a loop.
D. The switch is in the open position. If Martin lifts the switch, it will close the circuit and electricity will flow from the battery to the light bulb in a loop.
Question 17(Multiple Choice Worth 2 points)
(07.01 MC)
Answer: maybe D sorry if it's wrong
Explanation:
Select all the names that could be used to describe the figure
A parallelogram
B quadrilateral
c rhombus
D square
1017 Answered
Answer:
Quadrilateral because there is no parallel and equal
which are the only two elements liquid at room temperature?
Answer:
mercury and bromine are the only two elements
Explain the reason that maps must change over time
Explanation:
Because the place on the map can be changed to another shape by natural effects like faulting,folding , volcanism
Answer:
Maps must change over time as the geographical structures change from time o time. The roads and highways also change often due to the development activities .