Answer:
x means unknown it is an unknown value.
For example if you have 2 x you have 2 u know values.
Explanation:
If you want us to explain it further please provide a picture.
What is X
Answer:-X mean an Unknown value in a question.
for example :- 2x = 4
→ Here, the value of x is not known but it can be known by solving the problem.
The solution is :-
=> 2x = 4
=> x = 4/2
=> x = 2
So, here the value of X is 2
Hence, we can say that "X is an unknown value in a question and solving that question gives the correct value of x"
-TheExtraterrestrial
A toy helicopter takes off and moves 2 m up and then 2 m back down. What
is the displacement of the helicopter?
A. 0 m
B. 2 m down
C. 2 m up
D. 4 m
Answer:
0m
Explanation:
2m up - 2m down =0m
HELP! ASAP! Iron (Fe) and copper (II) chloride (CuCl2) combine to form iron (III) chloride (FeCl3) and copper (Cu). If you start with 155,8 grams of
iron (Fe), how many grams of copper (Cu) will be produced?
2Fe + 3CuCl2 à 2FeCl3 + 3Cu
Answer: 30.978
Explanation:
From the equation 2 moles of Fe will result in 3 moles copper
so .325 moles Fe will result in .4875 moles Cu
Cu weights 63.546 gm per mole
.4875 moles * 63.546 gm / mole = 30.978 gm of Cu
Explain why this combination of compounds can or cannot make a buffer solution. Hint: apply definition of a buffer, mechanism of its action and consider whether the compound is acid (weak/strong) or base (weak/strong). HF (0.2 mol) and NaOH (0.1 mol)
Answer:
This combination can make a buffer
Explanation:
A buffer is defined as an aqueous mixture of a weak acid and its conjugate base, or vice versa.
In the problem, HF is a weak acid, and its conjugate base is F⁻.
When NaOH reacts with HF, F⁻, Na⁺ and H₂O are produced as follows:
NaOH + HF → F⁻ + Na⁺ + H₂O
As there are initially 0.2mol of HF and 0.1mol NaOH, after the reaction you will have:
0.1mol HF and 0.1mol F⁻. As both, the weak acic and the conjugate base are present:
This combination can make a bufferBrainiest and 10 Points
Which has a HIGHER frequency?
A. Visible
B. Ultraviolet
Answer:
B. Ultraviolet
Explanation:
UV has a higher frequency and shorter wavelength than visible light
I need help Type th temperature (in Kelvin) in the left column and the volumes in the right column, being sure to keep pairs of data together. then click resize window to fit data.
the data appears to be
linear
quadratic
exponential
logarithmic
Answer:
Linear
Explanation:
How many moles of zinc are in 0.535 g ?*
Answer:
0.00818 moles
Explanation:
Question 1
Where does photosynthesis happen in a plant cell?
O Cell membrane
O Cell wall
O Chloroplast
O Mitochondria
Answer:
Chloroplast
Explanation:
Photosynthesis happens in chloroplast of plants. Mitochondira is where the cellular respiration happens.
In Atom, what is a heavier sub-atomic particle than the others and explain why
The nucleons are havier in sub atomic particle like neutrons and protons.
fun fact i read in a book even 1cm³ of nucleons are around 2 million Kg which you can't pick up by hand even by machines like buldozer.
how do the hydrosphere and atmosphere interact? give an example
Answer:
Evaporation
Explanation:
Water in the ocean, rivers, lakes, etc. is part of the hydrosphere, and when that water evaporates it enters the atmosphere
Calculate the percent composition by mass of iron in Fe(NO3)3
Answer:
It's 23.14 percent
Explanation:
First, the mass of all the elements are:
N = 14
O = 16
Fe = 56
In this molecule you have 3 atoms of N, and 9 atoms of O, so:
3•14 = 42
16•9 = 144
The whole mass of the molecule is:
56 + 42 + 144 = 242
242/100 = 2.42, so 1% is 2.42
56/2.42 = 23.14%
What do all fossil fuels have in common?
O A. They are all liquids.
OB. They all contain crude oil.
O C. They all produce nitrogen as a combustion product.
O D. They are all nonrenewable energy sources.
Answer:
Your answer would be D, they are all non-renewable energy sources. Hope this helps!
Answer:
D. They are all nonrenewable energy sources.
What is the formula for calculating the pH of a solution
Observe: Click Reset (). The electrons in the outermost orbit, called valence electrons, help to create chemical bonds. Create a lithium atom (3 protons, 4 neutrons, 3 electrons). How many valence electrons are in a neutral lithium atom?
Answer:
There is one valence electron in a neutral lithium atom.
Explanation:
The number of valence electrons in a neutral lithium atom is equal to one.
What is a valence electron?Valence electrons can be described as the electrons filling the outermost shell of an atom while the electrons in the inner shell of an atom are known as core electrons. Lewis structures are used to determine the number of valence electrons and know the types of chemical bonds.
Valence electrons of an atom can be filled in the same or different orbitals and these electrons are responsible for the interaction between atoms and cause the formation of chemical bonds.
Only electrons occupied in the outermost shell can participate in the formation of a bond or a molecule and are responsible for the reactivity of the element.
The number of electrons in the neutral atom of lithium is 3. There is only one electron present on the outermost shell 2s-orbital.
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How many atoms in total are there in 7.35 mol of magnesium oxide (MgO)
molecules?
Answer:
4.42 x 10^24
Explanation:
When an acetic acid solution is titrated with sodium hydroxide, the slope of the titration curve (pH versus volume of NaOH added) increases when sodium hydroxide is first added. This change shows that ________
Answer:
When an acetic acid solution is titrated with sodium hydroxide, the slope of the titration curve (pH versus volume of NaOH added) increases when sodium hydroxide is first added. This change shows that acetic acid is being converted to sodium acetate.
Explanation:
ABOUT TITRATION - Titration is a chemical analysis method for determining the amount of a constituent in a sample by adding an exact known quantity of another substance to the measured sample with which the desired constituent reacts in a specific, known proportion. A burette, which is essentially a long, graduated measuring tube with a stopcock and a delivery tube at the bottom end, is used to gradually administer a standard solution of titrating reagent, or titrant.
It is feasible to identify a good visual color indicator for many titration processes that will signify the end point at, or very near to, the equivalence point.
Acid-base titrations, precipitation titrations, complex-formation titrations, and oxidation-reduction (redox) titrations are examples of such titrations, which are categorised according to the nature of the chemical reaction that occurs between the sample and the titrant.
Titrations of metal ions with the reagent disodium ethylenediaminetetraacetate are the most important titrations based on complex-formation processes (a salt of edetic acid, or EDTA).
Hence , the answer is that acetic acid is converted into sodium acetate.
When aqueous solutions of potassium nitrite and nitric acid are mixed, an aqueous solution of potassium nitrate and nitrous acid results. Write the net ionic equation for the reaction.
Nitric acid and potassium nitrite reacted together potassium nitrate and nitrous acid forms. The net ionic equation for the reaction is given below:
[tex]\rm K^{+} (aq)+ NO_{3} ^{-} (aq)\rightarrow KNO_{3}(s)[/tex]
What is ionic equation?A balanced reaction represents all the reactants and products in perfect stoichiometry. Thus, each element have to be equal in number on both side.
A balanced ionic equation represents all the ions participating in a reaction and with their charges balanced on both side and state of the reaction is given in brackets. Net ionic equation represents the formation of a solid precipitate.
The complete ionic equation of reaction of one mole of potassium nitrite with one mole of nitric acid is given below:
[tex]\rm K^{+} + NO_{2}^{-}(aq) + H^{+} (aq) +NO_{3}^{-}(aq) \rightarrow H^{+} (aq) + NO_{2}^{-}(aq) + KNO_{3} (s)[/tex]
Cancelling the aqueous ions from both sides we get the net ionic equation representing the formation of solid potassium nitrate as shown here:
[tex]\rm K^{+} (aq)+ NO_{3} ^{-} (aq)\rightarrow KNO_{3}(s)[/tex]
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a gas tank contains 15 moles of oxygen and 20 moles helium what is apertial pressure of helium in this mixture
Answer:
D0wnload Phot0Math......................
Explanation:
How many moles of solute are in a 1.50 M solution of HCl with a volume of 7.98 liters?
Answer:
[tex]\boxed {\boxed {\sf x\approx 12.0 \ moles \ HCl}}[/tex]
Explanation:
Molarity is a measure of concentration in moles per liter.
[tex]molarity= \frac{moles \ of \ solute}{liters \ of solution}[/tex]
We know the solution has a volume of 7.98 liters and it has a molarity of 1.50 M HCl.
1 molar (M) is 1 mole per liter, so the molarity is also 1.50 moles of HCl per liter.We know 2 values for the variables, but the value for moles of solute is unknown, so we use x.
molarity= 1.50 mol HCl/L moles of solute=xliters of solution = 7.98 LSubstitute the values into the formula.
[tex]1.50 \ mol \ HCl/L=\frac{x}{7.98 \ L}[/tex]
We are trying to solve for x, the moles of solute, so we must isolate the variable. It is being divided by 7.98 liters and the inverse of division is multiplication. Multiply both sides of the equation by 7.98 liters.
[tex]7.98 \ L *1.50 \ mol \ HCl/L=\frac{x}{7.98 \ L} * 7.98 \ L[/tex]
[tex]7.98 \ L *1.50 \ mol \ HCl/L=x[/tex]
The units of liters (L) cancel each other out.
[tex]7.98 *1.50 \ mol \ HCl=x[/tex]
[tex]11.97 \ mol \ HCl=x[/tex]
The original measurements of molarity and volume both have 3 significant figures, so our answer must have the same. For the number we found, that is the tenths place.
The 9 in the hundredth place tells us to round the 1 to a 2. We leave a 0 in the tenths place to ensure there are 3 significant figures.
[tex]12.0 \ mol \ HCl \approx x[/tex]
There are approximately 12.0 moles of solute in the solution.
8x10^-200 in significant figures PLEASE IVE BEEN STUCK ON IT FOR 2 HOURS
How many grams of ammonium fluoride, , must be dissolved to prepare 300. mL of a 0.234 M aqueous solution of the salt
Answer:
24.24 g
Explanation:
First we calculate how many moles are there in 300 mL of a 0.234 M solution, using the definition of molarity:
Molarity = moles / litersConverting 300 mL to L ⇒ 300 mL / 1000 = 0.300 L
0.234 M = moles / 0.300 Lmoles = 0.78 molesThen we convert 0.78 moles of NH₄F into grams, using its molar mass:
0.78 mol * 31.073 g/mol = 24.24 gWhat transition energy corresponds to an absorption line at 460 nm?
A. 6.52 x 10-19 J
B. 4.32 x 10-19 J
C. 4.45 x 10-19 J
D. 2.31 x 10-19 J
Answer:
B. 4.32 x 10-19 J is correct via a p e x
Explanation:
a. acidic
b. basic
; neutral
d. will not be affected
Find the molarity of 10% NaOH.[MOE 2003
a. 1.5
b! 2.5
c. 4
d. 0.4
10 ml of 2.5 N NaOH is mixed with 20 ml of
N HCI. The mixture is diluted to 100 ml. WI
is the nature of mixture?
IMOF 20
1. You didn't post the question to Number 1.
2.
10% means There's 10g in 100ml of this solution.
This is the weight/volume(w/v) expression of concentration.
So
We have Mass =10g
volume =100ml
Molarity = Moles of solute/volume of solution(in LITRES)
Moles=Mass/Molar mass
Molar mass of NaOH=40g/mol
Mole=10/40
=0.25mole
Volume =100ml =0.1Litres
MOLARITY=0.25/0.1 =
=2.5M
OPTION B.
3. NOTE: THE MOLARITY AND NORMALITY OF NAOH AND HCL ARE THE SAME(This doesn't happen for all compounds tho)
So We can take 2.5N(Normality) of NaOH to be 2.5M(Molarity) NaOH
I think you forgot to write the Normality of the second one. I'll take it to be 1N. Maybe you can then Input supposed value when you're solving on your own
So
1N HCl is same as 1M HCL
We were given their respective volumes
2.5M NaOH can also be written as 2.5mole/volume(in Liters)
The volume of NaOH =10ml or 0.01L
Moles = 2.5mole/L x 0.01L
You notice that Liters on top and bottom cancels out... leaving the moles
So
Mole=0.01x2.5 = 0.025moles of NaOH
we're gonna do the same for 1N HCl in 20ml(0.02L)
So
Mole = 1 x 0.02 =0.02moles
Total Mole = 0.02 + 0.025 =0.045moles
The Final Volume is 100ml as stated in the question. It was diluted to 100ml or 0.1L
So
Final Concentration In Molarity
= Total Moles/Volume in L
=0.045/0.1
=0.45M.
A student wishes to determine the chloride ion concentration in a water sample at 25 °C using a galvanic cell constructed with a graphite electrode and a half-cell of AgCl(s) + e⁻ → Ag(s) + Cl⁻(aq) E°red = 0.2223 V And a copper electrode with 0.500 M Cu²⁺ as the second half cell Cu²⁺(aq) + 2 e⁻ → Cu(s) E°red= 0.337 V The measured cell potential when the water sample was placed into the silver side of the cell was 0.0925 V. What is the standard cell potential for this cell in V?
The question is incomplete, the complete question is;
And a copper electrode with 0.500 M Cu²⁺ as the second half cell
Cu²⁺(aq) + 2 e⁻ → Cu(s) E°red= 0.337 V
The measured cell potential when the water sample was placed into the silver side of the cell was 0.0925 V.
A- What is the standard cell potential for this cell in V?
B- What is the value of the standard free energy (in kJ) for this reaction?
C- Write the balanced equation for the overall reaction in acidic solution?
D- And the measured cell potential is 0.0925, what is the concentration of chloride ions in the solution?
Answer:
See Explanation
Explanation:
a) E°cell = E°cathode - E°anode
E°cell = 0.337 V - 0.2223 V
E°cell = 0.1147 V
b) ΔG°cell = −nFE°cell
Where n=2 and F = 96500C
ΔG°cell =-(2 * 96500 * 0.1147 )
ΔG°cell =-22,137.1 J or -22.1371 KJ
c) 2Ag(s) + 2Cl⁻(aq) + Cu²⁺(aq) -----> 2AgCl(s) + Cu(s)
d) From Nernst Equation;
E= E°cell - 0.0592/n log Q
0.0925 = 0.1147 - 0.0592/2 log 1/[0.500] [Cl⁻]^2
0.0925 - 0.1147 = - 0.0592/2 log 1/[0.500] [Cl⁻]^2
-0.0222 = -0.0296 log 1/[0.500] [Cl⁻]^2
-0.0222/-0.0296 = log 1/[0.500] [Cl⁻]^2
0.75 = log 1/[0.500] [Cl⁻]^2
Antilog (0.75) = 1/[0.500] [Cl⁻]^2
5.6234 * 0.500 = [Cl⁻]^2
[Cl⁻] = √2.8117
[Cl⁻] = 1.68 M
A galvanic cell is a voltaic cell that produces electrical energy from the oxidation-reduction process. The standard cell potential of the cell is 0.1147 V.
What is standard cell potential?The standard cell potential is a difference between the electrode potential of the cathode and the anode of the cell.
The balanced overall reaction of the cell is given as,
[tex]\rm 2Ag(s) + 2Cl^{-}(aq) + Cu^{2+}(aq) \rightarrow 2AgCl(s) + Cu(s)[/tex]
The standard cell potential is calculated as:
[tex]\begin{aligned} \rm E^{\circ}cell &= \rm E^{\circ}cathode - E^{\circ} anode\\\\&= 0.337 - 0.2223 \\\\&= 0.1147\;\rm V\end{aligned}[/tex]
Therefore, 0.1147 V is the standard cell potential for the cell.
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Compound X has the molecular formula C6H10. X decolorizes bromine in carbon tetrachloride. X also shows IR absorption at about 3300 cm-1 . When treated with excess hydrogen and a nickel catalyst, X yields 2-methylpentane. The most likely structure for X is:
Answer:
The correct answer is - option D. (check image)
Explanation:
Alkynes and alkenes both decolorized bromine in carbon tetrachloride. The absorption of the IR at about 3300 cm-1 for the X here that are found in the terminal alkynes absorption range only. In presence of excess hydrogen and a nickel catalyst, x gives the 2-methyl pentane.
The most likely structure for X is: CH3-CH3-ch-CH2-C≡CH
A compound having double and triple bonds is called alkenes and alkynes. The most likely structure of the compound will be 2 -methyl -4- hexyne.
What is the molecular formula?
The molecular formula represents the chemical atomic proportions of the compound or the molecule through the symbols, and numbers.
Bromine is decolorized by the alkynes and alkenes. The absorption range is followed by the terminal alkynes and in excess hydrogen yields 2-methyl pentane.
Therefore, 2 - methyl - 4 - hexyne is most likely to be X.
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As the diagram model the processo se reproduction lomon) formand change formation Sexual reproduction results in a child that is different from its parents because
A. the child receives all of is genetic information from its mother
B. the child produces its own genetic information once it is formed
C. the child receives half of is genetic information from each parent
D. the child receives all of it's genetic information from it's father there
Answer:
The answer is C. the child receives half of is genetic information from each parent
Explanation:
hope this helps enjoy
write the manufacturing process of oxygen gas from liquid air
Answer:
Production of liquid oxygen from air Oxygen is generated by liquefaction of atmospheric air in the air separation unit (ASU). Cryogenic technique is the most commonly used for producing liquid oxygen for industrial and medical applications .
Explanation:
An air separation unit (ASU) uses continuous cryogenic distillation to continuously liquefy ambient air and separate the oxygen gas.
What is oxygen?Oxygen is the second largest abundant element in the atmosphere comprising 20.8% by volume. Despite being mostly used as a gas, oxygen is frequently stored as a liquid. Compared to high-pressure gaseous storage with a similar capacity, liquid storage is less expensive and bulkier.
A cryogenic storage tank, one or more vaporizers, and a pressure control system make up a typical storage system. The cryogenic tank is built similarly to a vacuum bottle.
The primary air compressor is where the ASU manufacturing process starts, and the product storage tanks' output is where it concludes. Moisture, carbon dioxide, and hydrocarbons are taken out of the air after it has been compressed and put through a purification system.
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A plot of binding energy per nucleon (Eb/ A) versus the mass number (A) shows that nuclei with a small mass number have a small binding energy per nucleon, as the mass number increases the binding energy per nucleon increases, and the value for the binding energy per nucleon has a maximum value for nuclei with a mass number around 60. Verify that this is the case by determining the binding energy per nucleon for each of the following four nuclei. (Let the mass of a proton be 1.0078 u, the mass of a neutron be 1.0087 u, the mass of 2H be 2.0141 u, the mass of 7Li be 7.0160 u, the mass of 62Ni be 61.9283 u, and the mass of 110Cd be 109.9030 u.
a. 2H
b. 7Li
c. 62Ni
d. 110Cd
Answer:
a) 1.12 MeV / nucleon
b) 5.62 MeV / nucleon
c) 8.80 MeV / nucleon
d) 8.56 MeV / nucleon
we can conclude that the binding energy has a maximum value for nuclei with a mass around 60
Explanation:
Binding energy = ( Δm * 931.5 ) MeV
Binding energy per nucleon = Binding energy in / Number of nucleon
a) ²H = 1 neutron , 1 proton = 2 nucleons
Given that the theoretical mass = 2.0141 u
Actual mass = 1.0078 u + 1.0087 u = 2.0165 u
Δm = 2.0165 u - 2.0141 u = 2.4 * 10^-3 u
∴ Binding energy per nucleon = ( 2.4 * 10^-3 * 931.5 ) MeV / 2 nucleons
= 1.12 MeV / nucleon
b) ⁷Li = 3 protons , 4 neutrons = 7 nucleons
theoretical mass = 7.0160 u
Actual mass = ( 3 * 1.0078 ) + ( 4 * 1.0087 ) = 7.0582 u
Δm = ( 7.0582 u - 7.0160 u ) = 0.0422 u
∴ Binding energy per nucleon = ( 0.0422 * 931.5 ) / 7
= 5.62 MeV / nucleon
C) ⁶²Ni = 28 protons , 34 neutrons = 62 nucleons
Theoretical mass = 61.9283 u
Actual mass = ( 28 * 1.0078 ) u + ( 34 * 1.0087 ) u
= 62.5142 u
Δm = 0.5859 u
∴ Binding energy per nucleon = ( 0.5859 * 931.5 ) / 62
= 8.80 MeV / nucleon
D) ¹¹⁰Cd = 48 protons , 62 neutrons = 110 nucleons
Theoretical mass = 109.9030 u
Actual mass = ( 48 * 1.0078 ) + ( 62 * 1.0087 )
= 110.9138 u
Δm = ( 110.9138 - 109.9030 ) = 1.0108 u
∴ Binding energy per nucleon = ( 1.0108 * 931.5 ) / 110
= 8.56 MeV / nucleon
hence we can conclude that the binding energy has a maximum value for nuclei with a mass around 60
Statement which represents following chemical reaction.
Answer:
Third option is the correct answer
Explanation:
A solution of sodium chloride and a precipitate of barium sulphate is formed.
1.
When 0.990g of Na3PO4.12H20 reacts with excess BaCl2.2H20 how many
moles of Ba3(PO4)2are produced?
The balanced reaction is
(Na3PO4)12H2O + 9(BaCl2)2H2O → 6Ba3(PO4)2 + 36NaCl + 10H2O
molar mass of (Na3PO4)12H2O = 380 g/mol
given mass of (Na3PO4)12H2O = 0.990 g
moles of (Na3PO4)12H2O = given mass/molar mass
moles of (Na3PO4)12H2O = 0.990/380= 0.0026 mole
one mole of (Na3PO4)12H2O forms 6 mole of Ba3(PO4)2
0.0026 mole of (Na3PO4)12H2O forms 0.0026×6 =
0.0156 mole of Ba3(PO4)2
mass of 0.0156 moles of Ba3(PO4)2 is = 0.0156 × 601.9 g = 9.40 gram
You start with 0.1 L of a 5.00 M solution, and you plan to dilute it to make a
solution with a concentration of 0.625 M. How much water did you add to
the container?
a) 800ML
b) 100ml
c)700ml
d)750ml