In a redox chemical reaction, one species gets reduced and another gets oxidized. Manganese element is reduced in this reaction.
What is oxidized and reduced?In a redox reaction, the increase or decrease in the oxidation number and electrons results in the reduction and oxidation of the chemical species. The oxidation and reduction occur simultaneously in a reaction.
The oxidation number of Mn in permanganate ion was +8 on the left side and decreased to +4 on the right side of the equation. Potassium permanganate is an oxidizing agent that has reduced the manganese ion of the permanganate ion.
Therefore, manganese is reduced.
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Carbon-14 has a half-life of 5,730 years. How long will it take for 112. 5 g of a 120. 0-g sample to decay radioactively? 5,730 years 11,460 years 17,190 years 22,920 years.
The time taken by Carbon-14 to decay radioactively from 120g to 112.5g is 22,920 years.
How do we calculate the total time of decay?Time required for the whole radioactive decay of any substance will be calculated by using the below link:
T = (n)(t), where
t = half life time = 5730 yearsn = number of half life required for the decayInitial mass of Carbon-14 = 120g
Final mass of Carbon-14 = 112.5g
Left mass = 120 - 112 = 7.5g
Number of required half life for this will be:
1: 120 → 602: 60 → 303: 30 → 154: 15 → 7.54 half lives are required, now on putting values we get
T = (4)(5730) = 22,920 years
Hence required time for the decay is 22,920 years.
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Please help me? I am not understanding any of this
Answer:
Hydrogen
Explanation:
These are what hydrogen isotopes look like
is it true that a front is the boundry where two air masses meet
That's correct! When two different air masses meet, the boundary zone between them is called a front. The process of formation of the fronts is known as frontogenesis.
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Hope this helps! :)
Why did the Marshall Plan include aid for the defeated Axis powers?
Question
Answer:
One of the purposes of the Marshall Plan was to aid nations in economic recovery from WWII.
Explanation:
The Marshall Plan aided the defeated Axis powers because that's one of the reasons it was created, The Marshall Plan was supposed to rehabilitate the economies of the 17 western and southern European countries in order to create stable conditions for democracy to continue.
Solid potassium fluorine gas → solid potassium fluoride balanced
The balanced symbol equation for Solid potassium fluorine gas → solid potassium fluoride is 2 K + F₂ → 2 KF ⁻.
What is a balanced equation?The reactants are on the left side of the arrow in a balanced equation, while the products are on the right.
The moles in a compound are indicated by the number in front of the chemical formula. Subscripts indicate the number of atoms in a single molecule (numbers below an atom).
Thus, the balanced equation is 2 K + F₂ → 2 KF ⁻.
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Niels Bohr adapted the nuclear model.
Describe the change that Bohr made to the nuclear model.
Answer:
To remedy the stability problem, Bohr modified the Rutherford model by requiring that the electrons move in orbits of fixed size and energy.
SO2+02➡SO3
balance chemical equation
Answer:
2S02 + O2 ---> 2SO3
Its balanced now as Reactants = Products.
4 pt
Question 6
(05.06 LC)
The actual yield of a product in a reaction was measured as 2.80 g. If the theoretical yield of the
product for the reaction is 3.12 g, what is the percentage yield of the product? (4 points)
82.7%
85.2%
87.3%
89.7%
89.74% is the percentage yield of the product. Hence, option D is correct.
What is the meaning of percentage?The percentage can be calculated by dividing the value by the total value and then multiplying the result by 100.
Given data:
Actual yield of product = 2.80 g
Theoretical yield = 3.12 g
Percent yield = ?
Formula:
Percent yield = [tex]\frac{\;actual \;yield \;X \;100}{theoretical \;yield}[/tex]
by putting values in the formula,
Percent yield =[tex]\frac{2.80 g X 100}{ 3.12 g}[/tex]
Percent yield = 89.74%
Hence, option D is correct.
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A storage tank contains n, o, and co2. The partial pressure of n and o gas are 600 torr and 150 torr. The total pressure is 825 torr. What is the partial pressure and mole fraction of co2?
The partial pressure of carbon dioxide is 75 torr.
What is Dalton's theory?Dalton's theory of gas states that total pressure of the mixture of gas sample is equal to the sum of the partial pressure of all the gases present in that sample.
Given that,
Total pressure of mixture = 825 torrPartial pressure of Nitrogen = 600 torrPartial pressure of oxygen = 150 torrPartial pressure of carbon dioxide = ?On putting values, we get
Partial pressure of carbon dioxide = 825 - (600 + 150) = 75 torr
Hence Partial pressure of carbon dioxide is 75 torr.
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What is the maximum mass of ethyl alcohol you could boil with 1000 j of heat, starting from 20°c?
The amount of maximum mass of ethyl alcohol that could we boil with 1000 J of heat, starting from 20°C is 7.08 grams.
How do we calculate the mass?Mass of the ethyl alcohol will be calculated by using the below equation as:
Q = mcΔT, where
Q = absorbed heat = 1000 Jm = mass of ethyl alcohol = ?c = specific heat of ethyl alcohol = 2.42 J/g.°CΔT = change in temperature = (78.37°C - 20°C) = 58.37°COn putting all these values, we get
m = 1000 / (2.42)(58.37) = 7.079 = 7.08g
Hence required mass of ethyl alcohol is 7.08grams.
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Select the correct structure that
corresponds to the name.
3,3-dimethylcyclopentene
A. CH3,
B
CH3
C. both
CH3
CH3
Please help me asap!!
Answer:
B
Explanation:
The naming of the compound is given by IUPACNumbering of the carbon atoms start from the double bondThe methyl groups lie at the 3rd positionHence, its name will be :3,3 - dimethylcyclopentaneOption B shows the correct structureName the factors that liquefy atmospheric gas depend
Atmospheric gases can be liquefied by applying pressure and lowering temperature.
Consider the reaction hc2h3o2(aq) h2o(l) → h3o (aq) c2h3o2–(aq). Which species is the conjugate acid?a. C2h3o2-(aq)b. H2o(l)c. H3o (aq)d. Hc2h3o2(aq)e. Two of these
The species that is the conjugate acid is HC₂H₃O₂(aq). The correct option is d.
What are conjugate acid?Conjugates acids are those acids which are made when an acid donates a proton to a base according to Bronsted Lowry theory.
In other words, we can say that it is an acid with hydrogen ion. An example is water (base) reacting with an acid to form the hydronium ion (conjugate acid).
Thus, the correct option is d, HC₂H₃O₂(aq).
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CHEMISTRY PLS HELPPP
Which of the following molecules is optically active?
A. 3,3-dichloropent-1-ene
B. Butan-1-ol
C. 2-methylbutane
D. 2-bromopropanoic acid
Answer:
D
Explanation:
2-bromopropanoic acid is optically active because it contains chiral carbon bonded with 4 different atom ( CH3,H,COOH,Br).
Plsss helpssssssssSSS
If 70 grams of nitrogen gas will dissolve in a liter of solution at 1 atm of external
pressure. If the pressure is increased to 3 atmospheres, what would the solubility be?
Answer: Empirical formula, CH; Molecular formula, C2H2
Explanation:
16. How many moles of aluminum are needed to react completely with 1.2 mol of FeO?l
2 Al (s) + 3 FeO (s) → 3 Fe (s) + Al₂O, (s)
a. 1.2 mol
0.8 mol
c. 1.6 mol
d. 2.4 mol
Alpha Centauri IS
star that is about the same size as the IS Sun. John is using tennis balls to model how the Sun and Alpha
Centauri appear from Earth. He places one tennis ball one meter to his right to model the Sun. He places another tennis ball ten
meters to his left to model Alpha Centauri.
What does John notice about the tennis ball that is ten meters to his left?
es
It looks wider than the other tennis ball.
BI
It looks smaller than the other tennis ball
It looks different in color than the other tennis ball
It looks different in shape than the other tennis ball
Answer:
it looks smaller for sure ^_^
Part a
identify the problem that a car bumper is meant to address.
A car bumper is primarily meant to reduce the impact of damages to the front and rear ends of vehicles in case of collision.
Functions of car bumpersCars are equipped with bumpers both at the rear and front ends primarily for protective purposes.
The front end bumper reduces the impact of front collisions on the cooling system and the bonnet while the rear end bumper functions to protect the exhaust, the trunk, and several other parts in case of rear-end collisions.
Aside from protective functions, bumpers also serve to add beauty to cars.
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A sample of helium gas is
sealed in a container with a lid
that can be moved up and down.
Select all of the following that will result in an increase in pressure inside the container.
A. Decreasing volume
B. Increasing volume
C. Decreasing temperature
D. Increasing temperature
E. Adding one more mole of helium gas
F. Removing one mole of helium gas
P=nRT/V
P ≈ 1/V = decreasing volume
P ≈ T = increasing temperature
P ≈ n = adding one more mole of helium
Which of the following organisms have chlorophyll in their cells?
algae
green plants
some bacteria
all of the above
Answer:
all of the above
Explanation:
chlorophyll in found in virtually all photosynthetic organisms
How many grams of oxygen are needed to react with 25. 0 g of mg
The amount in grams of oxygen are needed to react with 25g of Mg is 16.48 grams.
How do we convert mass into moles?Mass into moles or vice versa of any substance will be calculated by using the below formula as:
n = W/M, where
W = given mass
M = molar mass
Moles of Magnesium = 25g / 24.3g/mol = 1.028 = 1.03 mol
Chemical reaction will be:
2Mg + O₂ → 2MgO
From the stoichiometry of the reaction it is clear that 1 mole of oxygen is reacts with 2 moles of magnesium, so 1.03 moles of magnesium will reacts with (1/2)(1.03) = 0.515 moles of oxygen.
Mass of oxygen = (0.515mol)(32g/mol) = 16.48g
Hence required mass of oxygen is 16.48 grams.
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Mechanical waves require a medium (matter) in order to travel, an example is _____________. Electromagnetic waves do not need a medium to travel and an example is ____________ A) light; sound B) sound; light C) air; space D) space; solid
Answer:
The answer is B. sound; light
Explanation:
Water and sound waves are mechanical and require a medium in order to travel. Light and radio waves are not mechanical but rather electromagnetic and do not need a medium.When the temperature and number of particles of a gas are constant, which of the following is also constant?
a. the product of the pressure and volume
b. the sum of the pressure and volume
c. the ratio of the pressure and volume
d. the difference of the pressure and volume
Find the minimum energy needed to eject electrons from a metal with a threshold frequency of 5. 65×1014 s−1
3.745 x [tex]10^{-19}J[/tex] is the minimum energy needed to eject electrons from a metal with a threshold frequency of 5.65 x [tex]10^{14}s^{-1}[/tex]
What is threshold frequency?The minimum frequency needed to cause electron ejection is referred to as the threshold frequency.
The energy carried by the incident light is E=hf
Where h is the Planck constant and f is the frequency of the light. The threshold frequency is the frequency that corresponds to the minimum energy needed to eject the electrons from the metal, so if we substitute the threshold frequency in the formula, we get the minimum energy the light must have to eject the electrons:
E=hf
h=6.63 x [tex]10^{-34}Js[/tex]
f=5.65 x [tex]10^{14}s^{-1}[/tex]
E=6.63 x [tex]10^{-34}Js[/tex] x 5.65 x [tex]10^{14}s^{-1}[/tex]
E= 3.745 x [tex]10^{-19}J[/tex]
Thus, 3.745 x [tex]10^{-19}J[/tex] is the minimum energy needed to eject electrons from a metal with a threshold frequency of 5.65 x [tex]10^{14}s^{-1}[/tex]
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Name these compounds according to IUPAC. (ASAPP)
The IUPAC name of the compound is propanal and acetone.
What is propanal and acetones?Propanal is also called propanaldehyde, and it is an aldehyde which has one double bond and oxygen.
Acetone is a ketone. Ketones have functional group of R2CO.
Thus, the IUPAC name of the compound is propanal and acetone.
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The buoyant force on an object in water is equal to the object's density. True or false
NO LINKS
Answer:
False
Bouyant force = volume of displaced fluid * density of fluid
An aqueous solution contains the following ions: cl−, ag , pb2 , no−3, and so2−4. More than one precipitate will form. Identify the precipitates
An aqueous solution contains the following ions Cl⁻, Ag⁺, Pb²⁺, NO₃⁻ & SO₄²⁻ and more than one precipitate will form are AgCl, PbCl₂, PbSO₄ & Ag₂SO₄.
What is precipitate?Precipitate is the insoluble compound which is present at the bottom of any chemical reaction in the solid state.
If in an aqueous solution Cl⁻, Ag⁺, Pb²⁺, NO₃⁻ & SO₄²⁻ ions are present then:
Compounds AgCl, PbCl₂, PbSO₄ & Ag₂SO₄ are not soluble in water as it is present in the form of precipitate.Pb(NO₃)₂ is fully soluble in water and will not make precipitate.Hence precipitates are AgCl, PbCl₂, PbSO₄ & Ag₂SO₄.
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a solution has a volume of 500 ml and contains 0.570 mol of nacl what is the molarity
Answer: 1.14 M
Explanation:
500 mL is equal to 0.5 L.
So, the molarity is (0.570)/(0.5) = 1.14 M
8Li2S --> 16Li +S8 how many moles of Li would be produced when 5 moles of Li2S react?
Answer:
10moles
Explanation:
mole ratio = 8:16
therefore
1 mole Li2S forms 2 moles Li
when 5 moles Li2S reacts
5 moles Li2S = 5 x 2 moles Li
= 10 moles Li