Answer:
The nitrogen cycle
Explanation:
The nitrogen cycle is the process in which nitrogen (N₂) is converted to a biologically useful species (ammonia, NH₃).
We can also discard the other options given by the problem:
There is no phosphorus nor carbon in the reaction.The water cycle involves water changing phases (tipically from gas to liquid to gas again), instead of reacting and producing oxygen.To measure the concentration of an aqueous solution of , an analytical chemist adds strong acid to a sample of the solution and titrates it to the endpoint with of potassium permanganate solution. The balanced chemical equation for the reaction is:
The question is incomplete, the complete question is shown in the image attached.
Answer:
7.69%
Explanation:
The balanced equation of this reaction is shown in the image attached to this answer.
The reaction is redox because we can notice a change in the oxidation number of species from left to right in the reaction equation.
For instance, the oxidation number of oxygen was changed from -1 in H2O2 to zero in O2. Hence H2O2 was oxidized.
To calculate the percentage of H2O2 in the sample;
number of moles of KMnO4 = 137 ml/1000 * 0.230 M = 0.03151 moles of KMnO4
From the reaction equation;
2 moles of permanganate reacts with 5 moles of H2O2
0.03151 moles of permanganate reacts with 0.03151 moles * 5/2 = 0.079 moles of H202
Mass of H2O2 reacted = 0.079 moles of H202 * 34 gmol-1 = 2.69 g
Hence % by mass of H2O2 in the sample = 2.69 g/35 g * 100 = 7.69%
If the OH- concentration is 1 x 10^-2 , what is the ph
Answer:
the PH would be 12 the person was correct!
Explanation:
4.A 100 L sample of gas is at a pressure of 80 kPa and a temperature of 200 K. What volume does the same
sample of gas occupy at STP?
Answer:
V₂ = 107.84 L
Explanation:
Given data:
Initial volume = 100 L
Initial pressure = 80 KPa (80/101 =0.79 atm)
Initial temperature = 200 K
Final temperature =273 K
Final volume = ?
Final pressure = 1 atm
Formula:
P₁V₁/T₁ = P₂V₂/T₂
P₁ = Initial pressure
V₁ = Initial volume
T₁ = Initial temperature
P₂ = Final pressure
V₂ = Final volume
T₂ = Final temperature
Solution:
V₂ = P₁V₁T₂ /T₁P₂
V₂ = 0.79 atm × 100 L × 273 K / 200 K × 1 atm
V₂ =21567 atm.L.K /200 K.atm
V₂ = 107.84 L
2.Pressure is a force, what causes this force
Answer:
Pressure is a stress. It is a scalar given by the magnitude of the force per unit area. In a gas, it is the force per unit area exerted by the change of momentum of the molecules impinging on the surface. ... It is this force, acting on the surface of the solid, that we call the force due to pressure.
Explanation:
I hope this helps
Help please!
Describe Bohr’s model of the hydrogen atom
Explanation:
Bohr's model of the hydrogen atom is based on three postulates: (1) an electron moves around the nucleus in a circular orbit, (2) an electron's angular momentum in the orbit is quantized, and (3) the change in an electron's energy
What was the hiker's average velocity during part C of the hike?
10 km/min southwest
120 km/min west
0.13 km/min west
0.10 km/min north.
Answer:
0.13 km/min west
Explanation:
I just did the test.
How would I use the word evolution in a sentence?
What kind of ion forms when gallium (Ga) bonds with a non-metal
Answer:
Charged ion
Explanation:
Which of the following situations best shows deposition?
Answer:
chemistry, deposition occurs when molecules settle out of a solution. Deposition can be viewed as a reverse process to dissolution or particle re-entrainment. It is a phase change from the gaseous state to a solid, without passing through the liquid state, also called re-sublimation.
Explanation:
Examples include beaches, deltas, glacial moraines, sand dunes and salt domes. In severely cold temperatures frost will form on windows because the water vapor in the air comes into contact with a window and immediately forms ice without ever forming liquid water.
For the reaction, calculate how many grams of the product form when 2.8 g of Mg completely reacts.
Assume that there is more than enough of the other reactant.
2Mg(s)+O2(g)-->2MgO(s)
Answer:
4.64g MgO(s)
Explanation:
Given 2Mg(s) + O₂(g) => 2MgO(s)
2.8g excess (?)
=> 2.8g/24.31 g/mol
= 0.115 mol. Mg(s) => 0.115 mol. MgO(s)
grams MgO(s) produced = 40.31g/mol. x 0.115 mol. = 4.64g (Theoritical Yield)
Imagine you are a guest speaker for a kindergarten class and you have been asked to explain the chemical reaction occurring inside of a glow stick. What would you say
Answer:
Following are the solution to this question:
Explanation:
In this opinion, Tim Kane believed that its economy can not be badly affected by low manufacturing jobs in 1979, provided, in which an American industrial production had strong potential growth. Their view also opposes whatever Mr. Grove said of lower US employment particularly cos of increased production figures. Their opinion disputes as much as the American.
In Forbes, they wrote that All our industrial production is breaking records with increasing efficiency, despite a low number of industrial workers. Including Mr. grove, he favors beginning for small businesses. It was mainly due to the big advantage of smaller companies or the production of employment.
What process is most likely to immediately follow the replication of DNA?
Question 5 options:
Mitosis
Translation
Replication
Transcription ****************
The process is replication
In the process of cell division and synthesis of new DNA, the stage after replication is called as transcription at which the DNA segments are copied into a RNA molecule.
What is transcription?Replication is the process of dividing the a DNA segment into two equivalent strands. After replication, these two strands will pair with their complementary RNA strands and the second stage is called transcription.
The process of transcribing a section of DNA into RNA is known as transcription. Messenger RNA is created when specific DNA sequences are translated into RNA molecules that can encode proteins (mRNA).
Non-coding RNAs are RNA molecules that contain copies of other DNA sequences (ncRNAs). The RNA is termed as messenger RNA (mRNA) if the stretch of DNA is translated into an RNA molecule that encodes a protein. The mRNA then acts as a template for the translation of the protein.
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In the passage, you read about Dalia Kirschbaum, a geomorphologist. In her work, she uses weather data collected
by NASA satellites to study which events?
Answer:
Landslides
Explanation:
Answer:
Landslides
Explanation:
Correct on edge
GIVING BRAINLIEST FOR ANSWER!!! What type of bonding takes place between the two atoms?
Answer:
Its B
Explanation:
Answer:
I think the answer is polar covalent as there will be an unequal amount of electrons shared/available. An ionic bond will not take place because the valance shell of the larger atom contains more than 1 electron.
Which group below correctly list bases that completely dissociate in water
Explanation:
Where's the question?
NEED HELP HAVE TO TURN IN IN 5 MIN
The two types of alleles are... (select two) 1 recessive
2expressive
3 dominant
4 doughnut
Answer:
Recessive and Dominant
Explanation:
Answer:
4 doughnut
Explanation:
A ball is rolled at a velocity of 3 m/s and rolls for 5 seconds. How far does
the ball roll? *
Answer 15m
Explanation: Distance = Speed x Time
3 x 5 =15
Which part of a seed plant develops into sperm cells? o embryo pollen 0 seed O xylem
Answer:
Pollen
Explanation:
bc i take notes and also my sister studies bio
PLZ GIMME BRAINLIEST
Answer:
correct
Explanation:
List factors that make the bonding of carbon atoms unique.
Answer:
yessirrrrrrrrrrrrrr
Explanation:lets get ma boa
A 488.3 gram sample of an unknown substance (MM = 92.41 g/mol) is heated from -23.1 °C to 51.8 °C. (heat capacity of solid = 2.96 J/g・°C; heat capacity of liquid = 1.75 J/g・°C; ∆Hfus = 8.04 kJ/mol; Tfinal = 17.6 °C)
a) How much energy (in kJ) is absorbed/released to heat the solid?
b)How much energy (in kJ) is absorbed/released to melt the solid?
c)How much energy (in kJ) is absorbed/released to heat the liquid?
d) What is the total amount of energy that must be absorbed/released for the entire process?
Answer:
a) Q₁ = 58.82 KJ
b) Q₂ = 42.48 KJ
c) Q₃ = 29.22 KJ
d) Q = 130.52 KJ
Explanation:
a)
In order to find the energy absorbed to heat the solid, we will use:
[tex]Q_{1} = mC_{1}\Delta T_{1}[/tex]
where,
Q₁ = Heat absorbed for heating solid = ?
m = mass of solid = 488.3 g = 0.4883 kg
C₁ = Specific Heat Capacity of Solid = 2.96 J/g °C
ΔT₁ = Change in temperature of Solid = Melting Temperature - Initial Temp.
ΔT₁ = 17.6°C - (-23.1°C) = 40.7°C
Therefore,
[tex]Q_{1} = (488.3\ g)(2.96\ J/g\ ^{0}C)(40.7\ ^{0}C)[/tex]
Q₁ = 58.82 KJ
b)
In order to find the absorbed to melt the solid at 17.6°C, we will use:
[tex]Q_{2} = nH_{fus}[/tex]
where,
Q₂ = Heat absorbed for melting solid = ?
H_fus = Heat of Fusion = 8.04 KJ/mol
n = no. of moles = [tex]\frac{m}{MM} = \frac{488.3\ g}{92.41\ g/mol} = 5.28 mol[/tex]
Therefore,
[tex]Q_{2} = (5.28\ mol)(8.04\ KJ/mol)[/tex]
Q₂ = 42.48 KJ
c)
In order to find the energy absorbed to heat the liquid, we will use:
[tex]Q_{3} = m C_{3}\Delta T_{3}[/tex]
where,
Q₃ = Heat absorbed for heating Liquid = ?
m = mass of solid = 488.3 g = 0.4883 kg
C₃ = Specific Heat Capacity of Liquid = 1.75 J/g °C
ΔT₃ = Change in temperature of Liquid = Final Temp. - Melting Temp.
ΔT₃ = 51.8°C - 17.6°C = 34.2°C
Therefore,
[tex]Q_{3} = (488.3\ g)(1.75\ J/g\ ^{0}C)(34.2\ ^{0}C)[/tex]
Q₃ = 29.22 KJ
d)
Total amount of energy absorbed during entire process is:
[tex]Q = Q_{1} + Q_{2} + Q_{3}[/tex]
[tex]Q = 58.82\ KJ + 42.48\ KJ + 29.22\ KJ[/tex]
Q = 130.52 KJ
In order to heat a 488.3 g solid, 58.8 kJ are required. To melt the solid, 42.5 kJ are required. To heat the liquid, 29.2 kJ are required. The total amount of energy absorbed is 130.5 kJ.
Initially, a 488.3 g solid at -23.1 °C is heated up to 17.6 °C (melting point). We can calculate the heat required (Q₁) using the following expression.
[tex]Q_1 = c \times m \times \Delta T = \frac{2.96J}{g.\° C } \times 488.3g \times (17.6\° C-(-23.1\° C)) \times \frac{1kJ}{1000J} = 58.8 kJ[/tex]
where,
c: heat capacity of the solidm: massΔT: change in the temperatureAt 17.6 °C, we can calculate the heat (Q₂) required to melt the solid using the following expression.
[tex]Q_2 = \Delta H_{fus} \times \frac{m}{MM} = 8.04 kJ/mol \times \frac{488.3 g}{92.41g/mol} = 42.5kJ[/tex]
where,
∆Hfus: enthalpy of fusionm: massMM: molar massThe liquid is heated from 17.6 °C to 51.8 °C. We can calculate the heat required (Q₃) using the following expression.
[tex]Q_3 = c \times m \times \Delta T = \frac{1.75J}{g.\° C } \times 488.3g \times (51.8\° C-17.6\° C)) \times \frac{1kJ}{1000J} = 29.2 kJ[/tex]
c: heat capacity of the liquidm: massΔT: change in the temperatureThe total amount of energy absorbed (Q) is the sum of the energy absorbed in each step.
[tex]Q = Q_1 + Q_2 + Q_3 = 58.8kJ+42.5kJ+29.2kJ= 130.5kJ[/tex]
In order to heat a 488.3 g solid, 58.8 kJ are required. To melt the solid, 42.5 kJ are required. To heat the liquid, 29.2 kJ are required. The total amount of energy absorbed is 130.5 kJ.
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Mercury may have ice trapped in the crater floors near the planet’s north pole.
a. True
b. False
What is the mole ratio of ammonia (with a pKb of 4.75) to ammonium chloride in a buffer with a pH of 9.09
Answer:
0.692
Explanation:
To solve this problem we can use Henderson-Hasselbach's (H-H) equation:
pOH = pKb + log [tex](\frac{[NH_4Cl]}{[NH_3]})[/tex]In which pOH can be calculated from the pH:
pOH + pH = 14pOH = 14 - pH = 14 - 9.09pOH = 4.91Then we use the H-H equation to calculate[tex]\frac{[NH_4Cl]}{[NH_3]}[/tex]:
4.91 = 4.75 + log [tex](\frac{[NH_4Cl]}{[NH_3]})[/tex]0.16 = log [tex](\frac{[NH_4Cl]}{[NH_3]})[/tex][tex]10^{0.16}[/tex] = [tex]\frac{[NH_4Cl]}{[NH_3]}[/tex][tex]\frac{[NH_4Cl]}{[NH_3]}[/tex]= 1.44As the problem asks for the ratio of ammonia to ammonium chloride, we invert [tex]\frac{[NH_4Cl]}{[NH_3]}[/tex]:
[tex]\frac{[NH_3]}{[NH_4Cl]}=\frac{1}{1.44}[/tex] = 0.692The mole ratio of ammonia to ammonium chloride in a buffer with a pH of 9.09 is 0.692.
How we write Henderson Hasselbalch equation?Henderson Hasselbalch equation for the weak base (NH₃) and for their conjugate acid (NH₄Cl) will be written as:
pOH = pKb + log[NH₄Cl]/[NH₃], where
pKb = base dissociation constant = 4.75
pOH will be calculated from the given value of pH as:
pH + pOH = 14
pOH = 14 - 9.09 = 4.91
Now we these values in the above equation and we get,
4.91 = 4.75 + log[NH₄Cl]/[NH₃]
log[NH₄Cl]/[NH₃] = 0.16
[NH₄Cl]/[NH₃] = 10⁰°¹⁶
[NH₄Cl]/[NH₃] = 1.44
[NH₃]/[NH₄Cl] = 1/1.44
[NH₃]/[NH₄Cl] = 0.692
Hence, required mole ratio is 0.692.
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Also known as motion energy
Answer:
kinetic energy
Explanation:
Answer:
kenetic energy is the one
Whats the answer giving brainliest have a good day lol help
Answer: i would say north pole because the sunlight has to change directions to reach it if that makes since
Explanation: sorry if im wrong
A small cylinder of helium gas used for filling balloons has a volume of 2.20 L and a pressure of 14300 kPa at 25 ∘C. Part A How many balloons can you fill if each one has a volume of 1.20 L and a pressure of 1.22 atm at 25 ∘C?
Answer:
You can fill 212 balloons.
Explanation:
First we calculate the helium moles in the small cylinder, using PV=nRT:
P = 14300 kPa ⇒ 14300 * 0.009869 = 141.13 atmV = 2.20 Ln = ?R = 0.082 atm·L·mol⁻¹·K⁻¹T = 25 °C ⇒ 25 + 273.16 = 298.16 K141.13 atm * 2.20 L = n * 0.082 atm·L·mol⁻¹·K⁻¹ * 298.16 K
n = 12.70 molThen we calculate the number of moles that can fit in a single balloon:
1.22 atm * 1.20 L = n * 0.082 atm·L·mol⁻¹·K⁻¹ * 298.16 Kn = 0.0599 molFinally we divide the total number of available moles by the number of moles in a single balloon:
12.70 mol / 0.0599 mol = 212.09So the answer is that you can fill 212 balloons.
Cyclopropane rearranges to form propene in a reaction that follows first order kinetics. At 800 K, the specific rate constant for this reaction is 2.74 x 10 - 3 s - 1. Suppose we start with a cyclopropane concentration of 0.290 M. How long will it take for 99.0 % of the cyclopropane to disappear according to this reaction
Answer:
1866.4 secs
Explanation:
The integrated rate law for first order kinetics is given by;
[A] = [Ao] ^-kt
Where;
[A] = concentration of cyclopropane at time = t
[Ao] = initial concentration of cyclopropane
k = rate constant
t = time taken
From the question, we are told that 99% of cyclopropane disappeared hence;
[A] = 0.290 - (0.99 * 0.290)
[A] = 0.290 - 0.2871
[A] = 0.0029 M
Hence
0.0029 = 0.290 e^-2.74 x 10^ - 3 * t
0.0029/0.290 = e^-2.74 x 10^ - 3 * t
0.01 = e^-2.74 x 10^ - 3 * t
ln(0.01) = -2.74 x 10^ - 3 * t
-4.61 = -2.74 x 10^ - 3 * t
t= -4.61/-2.74 x 10^ - 3
t = 1866.4 secs
WILL GIVE BRAINLIEST TO ANSWER
Answer:
2.5 grams
Explanation:
you can see it on the graph
Need help assap
Will give brainly
Answer:
C!
Explanation:
only C
A: solid B: liquid : C: GAS
Answer:
C.
Explanation:
Gas molecules are always spread far apart, and have room to move freely, so the answer is C.
Discuss between renewable and nonrenewable resources .Give an example for each.
Answer:
demos los
Explanation:
Answer: Renewable resources can be used again and again. Non-Renewable resources can be used once
Explanation: Sunlight, water, wind, are the renewable resources
Petrol, coal, natural gas are examples of non-renewable resources.
will give brainliest
Answer:
Na2SO4 + Bi(NO3)3 = Bi2(SO4)3 + NaNO3