a.NH₃+HCl⇒NH₄Cl
b.volume HCl=150 ml
c. pH=4.82
Further explanationReaction
NH₃+HCl⇒NH₄Cl
The equivalence point⇒mol NH₃=HCl
Titration formula :
M₁V₁n₁=M₂V₂n₂(n=acid base valence, NH₃=HCl=1)
mol NH₃
[tex]\tt 2.5\times 30=75~mlmol[/tex]
mol HCl=75 mlmol
Volume HCl :[tex]\tt \dfrac{75}{0.5}=150~ml[/tex]
Volume total :
[tex]\tt 150+30=180~ml[/tex]
molarity of salt(NH₄Cl)mol NH₄Cl=mol NH₃=75 mlmol=0.075 mol
[tex]\tt M=\dfrac{0.075}{0.180}= 0.42[/tex]
pH of solutionDissociation of NH₄Cl at water to find [H₃O⁺]
[tex]\tt NH_4+H_2O\rightarrow NH_3+H_3O^+[/tex]
ICE at equilibrium :
0.41-x x x
Ka(Kw:Kb)= 10⁻¹⁴ : 1.8.10⁻⁵=5.6.10⁻¹⁰
[tex]\tt Ka=\dfrac{NH_3.H_3O}{NH_4}=\dfrac{x^2}{0.41}[/tex]
[H₃O⁺]=x :
[tex]\tt \sqrt{5.6.10^{-10}\times 0.41}=1.515.10^{-5}[/tex]
pH=-log[H₃O⁺]
[tex]\tt pH=5-log~1.515=4.82[/tex]
Choose the formula for ammonium.
ΝΗ,
b NH3
C
(NH)3N
Answer:
NH4+ will be ammonium, NH3 is ammonia which is the conjugate base of ammonium.
Explanation:
An electrochemical cell is composed of pure nickel and pure iron electrodes immersed in solutions of their divalent ions at room temperature (25°C). If the concentrations of Ni2+ and Fe2+ ions are 0.002 M and 0.40 M, respectively, what voltage is generated at 25°C? (The respective standard reduction potentials for Ni and Fe are −0.250 V and −0.440 V.)
Answer:
0.758 V.
Explanation:
Hello!
In this case, case when we include the effect of concentration on an electrochemical cell, we need to consider the Nerst equation at 25 °C:
[tex]E=E\°-\frac{0.0591}{n} log(Q)[/tex]
Whereas n stands for the number of moles of transferred electrons and Q the reaction quotient relating the concentration of the oxidized species over the concentration of the reduced species. In such a way, we can write the undergoing half-reactions in the cell, considering the iron's one is reversed because it has the most positive standard potential so it tends to reduction:
[tex]Fe^{2+}+2e^-\rightarrow Fe^0\ \ \ E\°=0.440V\\\\Ni^0\rightarrow Ni^{2+}+2e^-\ \ \ E\°=-0.250V[/tex]
It means that the concentration of the oxidized species is 0.002 M (that of nickel), that of the reduced species is 0.40 M and there are two moles of transferred electrons; therefore, the generated potential turns out:
[tex]E=(0.440V+0.250V)-\frac{0.0591}{2} log(\frac{0.002M}{0.40M} )\\\\E=0.758V[/tex]
Beat regards!
Chemistry work here. Please help as soon as possible. I have allot of questions that needs to be answered. Can someone do it for me?
Answer:
I dont know about the yield but I think mno2 is the limiting reactant
Which symbol in a chemical equation separates the reactants from the products?
Answer:
The arrow symbol in a chemical equation separates the reactants from products. A chemical reaction is process in which chemical changes leads to the formation of products from reactants.
Explanation:
Introduction:
Briefly describe the physical behavior you investigated.
What is the exploration about?
What are you trying to discover?
Relate to any previous work.
Use new vocabulary words, if you can.
Answer: im not sure if this is the best answer but i wrote, "This exploration is about how the volume of a gas varies with temperature, and what the effect does to the gas and what effect it has on the results."
Explanation: hope this helps.
This exploration is about how the volume of a gas varies with temperature, and what the effect does to the gas and what effect it has on the results."
Thus, For persons with autism, life can be incredibly stressful at times, and their behaviour may be an indication of their utter exasperation or suffering in reaction to a variety of pressures.
Some people struggle with the idea of time and sequencing, thus this can involve onerous tasks, meeting new people, experiencing unpleasant sensory stimuli, a change in routine, switching activities, or having to wait for anything.
The individual may have realized how effective their actions could be in influencing their environment. A behaviour that was initially a reaction to physical discomfort or frustration may later develop into a strategy for evading a request or getting rid of an uncomfortable circumstance.
Thus, This exploration is about how the volume of a gas varies with temperature, and what the effect does to the gas and what effect it has on the results."
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The question is Incomplete, the complete question is:
Briefly describe the physical behavior?
What is the exploration about?
What are you trying to discover?
Relate to any previous work.
Use new vocabulary words, if you can.
In the exploration, I was a bird trying to eat bugs placed in different backgrounds. Each bug was adifferent color, and the color either matched or stood out against the background. What I wastrying to discover was how creatures adapted to their environment and if blending in with theirenvironment helped them or hindered them. I discovered that yes, blending in with theenvironment helps creatures survive.
Please don’t answer if you just want points
What is the empirical formula of the substance C6H14010?*
Answer:
[tex]\mathrm {CH_24}[/tex]
Explanation:
To determine the molecular formula, enter the appropriate value for the molecular mass. We get [tex]CH_{2}4[/tex] as our answer to the question.
Si, C, Ni which one is higher in ionization energy?
Answer:
I hope your having a good day, here is the answer to your following question:
C is the most highest energy...i just looked at a Periodic Trends — Ionization Energy
If i get it Right give brainlest
Explanation:
Similar cells with the same function, all working together for the same purpose, form the 2nd level of organization in an organism. This level is called a(n)
Answer:
tissue
Explanation:
cell→tissue→organ→systems→organism
which type of experiment follows ethical standars?
A.Releasing contaminated waste into water system?
b. perfoming test on animals when the information can be obtained in other ways?
c. doing research on animals in which the animal experiences to fear or pain.
d. perfoming tests on people who cannot protect themselfs?
Answer:
A.Realesing contaminated waste into the water system
Explanation:
because if you you try it would really work
Which number completes the balanced chemical equation showing the process of rusting?
4Fe + 3O2 ---> ____Fe2O3
A. 1
B. 2
C. 4
D. 12
Answer:
B. 2
Explanation:
HAPPYYYY TURKEY BREAK
Answer:
2
Explanation:
sodium chloride is made from sodium and chloride. would you expect the properties of sodium chloride to be simliar to sodium or cloride
Answer:
No
Its a chemical change so the characteristics or chemical properties always differs thereby the properties of sodium chloride isn't similar to sodium or chloride
Sodium is a soft metal with a relatively low work function. Light corresponding to 476 kJmol−1 was shone on the sodium metal, and the electrons detected had a velocity of 9.57×105ms−1. What is the work function of sodium metal based on this data? The mass of an electron is 9.11×10−31kg.
Based on the data given, the work function of sodium metal is equal to [tex]7.91 \times 10^{-19}\;Joules[/tex].
Given the following data:
Mass of an electron = [tex]9.11\times10^{-31}\;kg[/tex].Photo electric work function = 476 kJ/mol.Velocity of electrons = [tex]9.57\times10^{5}\;m/s[/tex]Avogadro constant = [tex]6.02 \times 10^{23}[/tex]
To determine the work function of sodium metal based on this data:
Mathematically, the photoelectric effect is given by the formula:
[tex]K.E = hf - BE_i[/tex]
Where:
K.E represents the maximum kinetic energy of the ejected electron.f is photon frequency.h is Planck constant ([tex]6.626 \times 10^{-34}\;J.s[/tex]).[tex]BE_i[/tex] is the work function of the material.However, since we were given the photo electric work function of light that was shone on the sodium metal, we would calculate the work function of sodium metal as follows:
[tex]\phi = \frac{Photo \;electric\; work \;function}{Avoadro's\;number}[/tex]
[tex]\phi = \frac{476 \times 10^3}{6.02 \times 10^{23}} \\\\\phi = 7.91 \times 10^{-19}\;Joules[/tex]
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How many grams of copper (II) nitrate would be produced from 0.80 g of copper metal reacting with excess nitric acid?
Answer:
[tex]m_{Cu(NO_3)_2}=2.36 gCu(NO_3)_2[/tex]
Explanation:
Hello!
In this case, since the chemical reaction between copper and nitric acid is:
[tex]2HNO_3+Cu\rightarrow Cu(NO_3)_2+H_2[/tex]
By starting with 0.80 g of copper metal (molar mass = 63.54 g/mol) and considering the 1:1 mole ratio between copper and copper (II) nitrate (molar mass = 187.56 g/mol) we can compute that mass via stoichiometry as shown below:
[tex]m_{Cu(NO_3)_2}=0.80gCu*\frac{1molCu}{63.54gCu} *\frac{1molCu(NO_3)_2}{1molCu} *\frac{187.56gCu(NO_3)_2}{1molCu(NO_3)_2} \\\\m_{Cu(NO_3)_2}=2.36 gCu(NO_3)_2[/tex]
However, the real reaction between copper and nitric acid releases nitrogen oxide, yet it does not modify the calculations since the 1:1 mole ratio is still there:
[tex]4HNO_3+Cu\rightarrow Cu(NO_3)_2+2H_2O+2NO_2[/tex]
Best regards!
Amount of copper (II) nitrate would be produced is 2.25 gram
Molecular mass:Given that;
Amount of copper metal = 0.80 g
Find:
Amount of copper (II) nitrate would be produced
Computation:
Cu + 4HNO₃ → Cu(NO₃) + 2NO₂ + 2H₂O
Number of moles = Given mass / Molecular mass
Number of moles = 0.80 / 63.5
Number of moles = 0.012 mol
So,
n = Given mass / Molecular mass
0.012 = Given mass / 63.5 + (63.5 + 48)
Given mass = 2.25 gram
Amount of copper (II) nitrate would be produced = 2.25 gram
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The balanced half-reaction in which chlorine gas is reduced to the aqueous chloride ion is a ________ process. one-electron two-electron four-electron three-electron six-electron
Answer:
Two-electron.
Explanation:
Hello!
In this case, since the half-reaction by which chlorine is reduced to aqueous chloride ion is:
[tex]Cl^0_2\rightarrow 2Cl^-[/tex]
We can see each chlorine undergo a decrease of electrons by 1, it means that, since there are two chlorine atoms undergoing an electron decrease, we write:
[tex]Cl^0_2+2e^-\rightarrow 2Cl^-[/tex]
Which means this is a two-electron process.
Best regards!
208
11- Predict the basicity of H2SO4 in the following reaction.
NaOH + H2SO4 – NaHSO4 + H20
Answer:
1
Explanation:
1 hydrogen is displaced from H2so4 in the reaction
What is true of the orbitals in the 3d energy level?
A. They have higher energy than 2s orbitals.
B. They have lower energy than 4f orbitals.
C. Together, the five 3d orbitals can hold 10 electrons.
D. All of the above are true.
Answer:
D. All of the above are true.
Explanation:
All the given options in the problem are true.
According to Aufbau's principle, the sublevels with lower energy are filled before those with higher energies.
The order of filling according to their energies is;
1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p
We see that the 3d energy level is lower than 4f but higher than 2s.
Also, the 3d orbital has 5 subshells and each can hold a maximum of two electrons.
This gives a capacity of 10 electrons.
In the reaction 2 Na(s) + F2(g) --> 2NaF (s), Given 12.5 g of fluorine with enough sodium, what mass of sodium fluoride forms?
Answer:
the mass of sodium fluoride is 15
Explanation:
One mole of F₂ or 38 g produces two moles or 84 g of NaF. Hence, 12.5 g of F₂ will produce 27.6 g of NaF.
What is sodium fluoride?Sodium fluoride is an ionic compound formed by the reaction of sodium metal and fluorine atom . Sodium metal loses one electron to fluorine and thus two moles of sodium and fluorine molecule produces 2 moles of NaF.
The molar mass of F₂ is 38 g. The molar mass of NaF is 42 g/mol. Thus mass of two moles of NaF is 84 grams. As per the balanced reaction, one mole or 38 g of F₂ produces two moles or 84 g of NaF. Thus mass of NaF is calculated as follows:
Mass of NaF = (12.5 g × 84 g) /38 g.
= 27.6 g.
Therefore, the mass of NaF produced by 12.5 g of F₂ in this reaction is 27.6 grams.
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The 38 elements in groups 3 through 12 of the periodic table are called "Alkaline Earth Metals" O True O False
Answer:
FALSE
they're called transition metals
Answer:
false
Explanation:
The 38 elements in groups 3 through 12 of the periodic table are called "transition metals." As with all metals, the transition elements are both ductile and malleable, and conduct electricity and heat.
25 grams of radon-222 remains after 15.28 days. How much radon was in the original sample? Write an equation for the decay of radon-222.
Answer:
half-life = 3.8 days
total time of decay = 15.2 days
initial amount = 100. g
number of half-lives past: 15.2/3.8 = 4 half-lives
4 half-lives = 1/16 remains
100. g x 1/16 = 6.25 g
Write the net ionic equation. An aqueous solution of sodium carbonate is added to an aqueous solution of calcium chloride. Calcium carbonate is precipitated
Answer:
Ca + CO₃²⁻ → CaCO₃
Explanation:
Solution:
Sodium carbonate = Na₂CO₃
Calcium chloride = CaCl₂
Calcium carbonate is precipitated
Reaction equation:
Na₂CO₃ + CaCl₂ → CaCO₃ + 2NaCl
The net ionic equation:
2Na⁺ + CO₃²⁻ + Ca + 2Cl⁻ → CaCO₃ + 2Na⁺ + Cl⁻
the spectator ions which both appears on both sides will cancel out and leave behind the net ionic equation:
Ca + CO₃²⁻ → CaCO₃
Why series fatty acid carbons seen in double from?
Which one is being shown in this picture?
Answer:
B. REFRACTION.
Is shown in fig.
Which statement about Fe is supported by the modern atomic theory but not John Dalton’s theory?
A. The element iron is composed of small particles called atoms.
B. The electrons of iron have probable locations in a region of space around the nucleus.
C. Iron atoms combine with other atoms in whole number ratios to form compounds.
D. Chemical reactions that involve iron do not create new atoms of iron.
Answer:
The correct option is B
Explanation:
One of the claims of John Dalton's atomic theory is that atom is the smallest unit of matter (which suggests that there are no particles smaller than an atom in any matter). This claim has been disproved by the modern atomic theory which established that there are particles smaller than atom (called subatomic particles). These particles are electrons, protons and neutrons.
One of the modern atomic theory was by Neils Bohr, who proposed that electrons move in circular orbits around the central nucleus. Thus, the electrons of iron can also be said to be present in a region of space (circular path) around the nucleus. This proves that option B is the correct option as John Dalton's theory did not even recognize the electron(s) nor the nucleus.
Answer:
b
Explanation:
What is the reason for the trend in Electron Affinity? Select all that apply.
A. number of protons in the nucleus
B. number of energy levels around the nucleus C. number of neutrons in the nucleus
D. larger atomic mass number
E. number of valence electrons.
Answer:
i think it a and d
Explanation:
A chemistry student named Igor was performing a titration experiment. He used 500mL of 6M sulfuric acid, H2SO4(aq) to completely neutralize a 2.00 L solution of unknown concentration sodium hydrodixe, NaOH(aq). What is the concentration of the NaOH(aq) in molarity (M)?
Answer:
3 M
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
H2SO4 + 2NaOH —> Na2SO4 + 2H2O
From the balanced equation above, the following data were obtained:
Mole ratio of the acid, H2SO4 (nA) = 1
Mole ratio of the base, NaOH (nB) = 2
Next, the data obtained from the question. This include the following:
Volume of acid, H2SO4 (Va) = 500 mL
Molarity of acid, H2SO4 (Ma) = 6 M
Volume of base, NaOH (Vb) = 2 L
Molarity of base, NaOH (Mb) =?
Next, we shall convert 2 L to millilitres (mL). This can be obtained as follow:
1 L = 1000 mL
Therefore,
2 L = 2 L × 1000 mL /1 L
2 L = 2000 mL
Thus, 2 L is equivalent to 2000 mL.
Finally, we shall determine the molarity of the base, NaOH. This can be obtained as follow:
Volume of acid, H2SO4 (Va) = 500 mL
Molarity of acid, H2SO4 (Ma) = 6 M
Volume of base, NaOH (Vb) = 2000 mL
Mole ratio of the acid, H2SO4 (nA) = 1
Mole ratio of the base, NaOH (nB) = 2
Molarity of base, NaOH (Mb) =?
MaVa / M Vb = nA/nB
6 × 500 / Mb × 2000 = 1/2
3000 / Mb × 2000 = 1/2
Cross multiply
Mb × 2000 × 1 = 3000 × 2
Mb × 2000 = 6000
Divide both side by 2000
Mb = 6000 /2000
Mb = 3 M
Thus, the molarity of the base, NaOH is 3 M.
The pH of 0.259 M solution of an unknown acid is measured to be 2.353. What is the Ka of the acid?
Answer:
[tex]Ka=7.73x10^{-5}[/tex]
Explanation:
Hello!
In this case, since the pH is measure of the amount of hydrogen ions in solution, first given the pH we can compute the concentration of hydrogen ions via:
[tex]pH=-log([H^+])[/tex]
[tex][H^+]=10^{-pH}=10^{-2.353}=4.436x10^{-3}M[/tex]
Thus, since the ionization of the given acid, leads to the following equilibrium expression as it is a weak one:
[tex]Ka=\frac{[H^+][A^-]}{[HA]}[/tex]
We notice the concentration of hydrogen ions equal the concentration of the acids conjugate base, so we can compute:
[tex]Ka=\frac{4.436x10^{-3}*4.436x10^{-3}}{0.259-4.436x10^{-3}}\\\\Ka=7.73x10^{-5}[/tex]
Best regards!
Why do you think elements have these repeating patterns and groups of similar elements ? Explain your reasoning as much as you can.
Answer:
The elements in the periodic table are arranged in order of increasing atomic number. All of these elements display several other trends and we can use the periodic law and table formation to predict their chemical, physical, and atomic properties. Understanding these trends is done by analyzing the elements electron configuration; all elements prefer an octet formation and will gain or lose electrons to form that stable configuration.
Please give me brilliant answer
I need serious help
Answer:
with what may I ask?
Explanation:
enshdufhd
Answer:
No teooobh the awnser is carrot
Explanation:
how does a squirrel get prepare for the winter months?
Answer:
Well, I have pet squirrels, and I know they get acorns and other food, and dig up certain spots on the ground, then put their food in there. And they have food for the winter.
Question 24 (3 points)
Choose the element below that has correct information about the number of energy
levels/orbitals: (Use a period table to answer this question).
Lithium (Li) has one energy level
Sodium (Na) has three energy levels
Potassium (K) has three energy levels
Fluorine (F) has seven energy levels.
Answer:
sodium
Explanation: