Answer:
answering so the person who wanted brainliest can get it :D
<3
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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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%
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.
If the OH- concentration is 1 x 10^-2 , what is the ph
Answer:
the PH would be 12 the person was correct!
Explanation:
If equal masses of each substance absorb the same amount of heat, which substance undergoes the greatest temperature change
Answer:
See explanation
Explanation:
The heat capacity of a substance is determined by the chemical composition of the substance and its mass.
Now, if substances have equal masses, the substance with the lesser heat capacity undergoes the greater temperature change.
Hence, among the substances, the particular one with the lowest heat capacity is expected to undergo the greatest temperature change.
If equal masses of each substance absorb the same amount of heat, the substance which undergoes the greatest temperature change is: the one with the lowest specific heat capacity.
Specific heat capacity can be defined as the quantity of heat required to raise the temperature of a physical object or body per unit mass, by one degree Celsius (1°C) or one Kelvin (1 K).
This ultimately implies that, specific heat capacity is the quantity of heat absorbed or released per unit mass of a substance when its temperature increases by one degree Celsius (1°C) or one Kelvin (1 K).
Mathematically, the quantity of heat is given by the formula;
[tex]Q = mc\theta[/tex]
Where:
Q represents the quantity of heat.m represents the mass of an object.c is the specific heat capacity.[tex]\theta[/tex] is the change in temperature.Making [tex]\theta[/tex] the subject of formula, we have:
[tex]\theta = \frac{Q}{mc}[/tex]
Deductively, a substance undergoes the greatest temperature change when its specific heat capacity is lowest and its mass remains constant.
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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
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.
The moon is 260,000 miles away. How many feet is it from earth?
Answer:
1,372,800,000 Feet
Explanation:
1 Mile = 5280 Feet
260,000 Miles = 5280 × 260,000 Feet
260,000 Miles = 1,372,800,000 Feet
How many mL of 0.2860 M sulfuric acid are required to react with 58.42 mL of 0.09756 M iron(III) hydroxide
Answer:
0.05978 mL of 0.2860 M sulfuric acid is required to react with 58.42 mL of 0.09756 M iron (III) hydroxide.
Explanation:
The balanced reaction between tha surfuric acid and iron (III) hydroxide is:
Fe(OH)₃ + 3 H₂SO₄ → Fe(HSO₄)₃ + 3 H₂O
By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of reactants and products participate in the reaction:
Fe(OH)₃: 1 mole H₂SO₄: 3 molesFe(HSO₄)₃: 1 mole H₂O: 3 molesBeing molarity (M) the number of moles of solute that are dissolved in a given volume:
[tex]Molarity=\frac{number of moles}{volume}[/tex]
then the number of moles can be calculated as:
number of moles= molarity* volume
So, if 58.42 mL ( 0.05842 L) of 0.09756 M iron (III) hydroxide react, then it means that the number of moles that react are:
number of moles= 0.09756 M* 0.05842 L
number of moles= 0.005699 moles
Now it is possible to apply the following rule of three: if by stoichiometry 1 mole of Fe(OH) ₃ reacts with 3 moles of H₂SO₄, then 0.005699 moles of Fe(OH) ₃ with how many moles of H₂SO₄ does it react?
[tex]moles of H_{2} SO_{4} =\frac{0.005699 moles ofFe(OH)_{3}* 3moles of H_{2} SO_{4} }{1mole ofFe(OH)_{3}}[/tex]
moles of H₂SO₄= 0.017097
Being sulfuric acid 0.2860 M, it is replaced in the definition of molarity:
[tex]0.2860M=\frac{0.017097 moles}{volume}[/tex]
Solving for the volume:
[tex]volume=\frac{0.017097 moles}{0.2860 M}[/tex]
volume= 0.05978 mL
0.05978 mL of 0.2860 M sulfuric acid is required to react with 58.42 mL of 0.09756 M iron (III) hydroxide.
4.
What is the mass of 16.6 x 1023 molecules of barium nitrate?
a 721 grams
b 2541 grams
C 927 grams
d 4338 grams
Answer: 721 grams
Explanation:
The mass of 16.6 x 10²³ molecules of barium nitrate is 721 grams.
HOW TO CALCULATE MASS:The no of moles of a substance can be calculated by dividing the number of molecules in the substance by Avogadro's number. That is;Moles of substance = no. of molecules ÷ 6.02 × 10²³
no. of moles = 16.6 x 10²³ ÷ 6.02 × 10²³
no. of moles = 2.76moles
Molar mass of Ba(NO3)2 = 261.34 g/mol
Mass of barium nitrate = 261.34 × 2.76
Mass of barium nitrate = 721g
Therefore, the mass of 16.6 x 10²³ molecules of barium nitrate is 721 grams.
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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.
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)
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.
describe the major advantages and disadvantages asexual and sexual reproduction
idk how to do this pls someone help me its on edge
Answer:
Ok so i know i'm late but i hope this helps anyone else that sees it.
(not a sample response)
Explanation:
Some of the advantages of Asexual Reproduction include the process requiring less energy and taking less time. Some of the disadvantages of Asexual Reproduction is that there is no variation in the DNA and there is more competition for resources.
Some of the advantages of Sexual Reproduction include variation in DNA and less competition for resources. The disadvantages of Sexual Reproduction include the process requiring more energy and the process being slower.
Answer:
Advantages of sexual reproduction
1. The new organism can have different variations of DNA
2. Can lead to a genetic variation of new offsprings and generations
Disadvantages
1.Takes more energy
2.Takes more time
Advantages of asexual reproduction
1. Takes less energy
2. Takes less time
3. Skips pollination and fertilization
Disadvantages
1.Can't lead to different genetic variations of offspring and generations.
2. DNA is the exact same
Explanation:
I got it right
Can the existence of isotopes explain the difference in properties between diamond and graphite?
Answer:yes
Explanation:
Both diamond and graphite are the allotropes of pure carbon (Carbon-12), they have different properties due to different types of arrangement of carbon atoms within their structures.
What is the difference in the properties between diamond and graphite?Diamonds have a strong three-dimensional network of carbon atoms while Graphites have a two-dimensional sheet-like structure. In a diamond, the network is formed because of the presence of covalent bonds between the carbon atoms. In graphite, bonds are generally due to weak Van der Waal's forces of attraction.
Therefore, diamonds are hard in nature while graphites are soft in nature. The molecules in diamonds are closely packed, as a result, they have high density. But in graphite, there is a large gap between molecules so they have low density.
As the diamonds have no presence of pi electrons they do not conduct electricity. But, there is the presence of pi electrons in graphite so they conduct electricity.
Therefore, the existence of isotopes does not explain the difference in properties between diamond and graphite
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A solution of HCl with a volume of 25.00 mL is titrated to the endpoint, with 0.250 M
NaOH. If it takes 34.56 mL of NaOH, what is the original concentration of HCl in the
solution?
HCl(aq) + NaOH(aq) → H20(l)+ NaCl(aq)
Answer:
[tex]0.3456\ \text{M}[/tex]
Explanation:
[tex]V_1[/tex] = Volume of NaOH = 34.56 mL
[tex]V_2[/tex] = Volume of HCl = 25 mL
[tex]M_1[/tex] = Concentration of NaOH = 0.25 M
[tex]M_2[/tex] = Concentration of HCl
When endpoint is reached the number of moles of NaOH will be equal to the number of moles of HCl
[tex]M_1V_1=M_2V_2\\\Rightarrow M_2=\dfrac{M_1V_1}{V_2}\\\Rightarrow M_2=\dfrac{0.25\times 34.56}{25}\\\Rightarrow M_2=0.3456\ \text{M}[/tex]
Concentration of HCl is [tex]0.3456\ \text{M}[/tex].
Which of the following does NOT describe elements? can join together to form compounds all the particles are alike can be broken down into simpler substances have unique sets of properties
Answer:
Can be broken down into simpler substances.
Explanation:
Elements are made of atoms, and that is the simplest understood unit of the universe. :) nOw GiB mY 50000 points.
Answer:
Can be broken down into simpler substances
Explanation:
Because atoms cannot be created or destroyed in a chemical reaction
WILL GIVE BRAINLIEST TO ANSWER
Answer:
2.5 grams
Explanation:
you can see it on the graph
Write the empirical formula of at least four binary ionic compounds that could be formed from the following ions:
Mg+2, Pb+4, I−, O−2
Answer:
MgI₂, MgO, PbI₄, PbO₂
Explanation:
For an ionic compound to be formed, it must be neutral, that is the total positive charge must be equal to the total negative charge.
Mg²⁺ and I⁻: The neutral ionic compound requires 1 Mg²⁺ and 2 I⁻ and the resulting empirical formula is MgI₂.
Mg²⁺ and O²⁻: The neutral ionic compound requires 1 Mg²⁺ and 1 O²⁻ and the resulting empirical formula is MgO.
Pb⁴⁺ and I⁻: The neutral ionic compound requires 1 Pb⁴⁺ and 4 I⁻ and the resulting empirical formula is PbI₄.
Pb⁴⁺ and O²⁻: The neutral ionic compound requires 1 Pb⁴⁺ and 2 O²⁻ and the resulting empirical formula is PbO₂.
What is the electron configuration of an isolated Cl atom? Express your answer in condensed form in order of increasing orbital energy as a string without blank space between orbitals. For example, [He]2s22p2 should be entered as [He]2s^22p^2.
Answer: [tex][Ne]3s^23p^5[/tex]
Explanation:
Electronic configuration represents the total number of electrons that a neutral element contains. We add all the superscripts to know the number of electrons in an atom.
The electrons are filled according to Afbau's rule in order of increasing energies . Chlorine atom has 17 atomic number of 17 and has 17 electrons. The nearest noble gas is Neon with 10 electrons and thus the electronic configuration in terms of noble gas is:
[tex]Cl:17:[Ne]3s^23p^5[/tex]
Identify the two functional groups that react together to form the ester linkage between monomers in the PET polymer
Answer:
PET polymer or Polyethylene terephthalate is also known as Terylene. In the PET polymer, the ester linkage between the monomers is formed by the reaction of the OH group of ethylene diol (glycol) and the CO2H group of terephthalic acid.
In the family of polyester, PET is considered as the mostly used thermoplastic polymer resin.
It is used widely in clothing fibers, as liquid and food containers, and as a substance for engineering resins. In the United Kingdom it is known as terelyne, in the United States as Dacron, and in Russia as Lavsan.
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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If the nucleus of an atom is represented
as
24x11 the atom is?
Answer:
i think it Na (sodium)
Explanation:
will give brainliest
Answer:
Na2SO4 + Bi(NO3)3 = Bi2(SO4)3 + NaNO3
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:
How many moles of solute are present in a solution of 0.165 L of 0.39 M NaNO3?
Answer:
00.8755521
Explanation:
After the first steps in writing an equation, the equation is balanced by
Answer:
law of conservation of mass
Explanation:
self explanatory
After the first steps in writing an chemical equation, the equation is balanced by adding coefficients so that law of conservation of mass is obeyed.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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List factors that make the bonding of carbon atoms unique.
Answer:
yessirrrrrrrrrrrrrr
Explanation:lets get ma boa
swel
What is a mixture?
Answer:a substance made by mixing other substances together.
Explanation:trust me
If 280cm3 of hydrogen diffuses in 40secs, how long will it take for 490cm3 of a gas x, whose vapor density is 25 to diffuse under the same condition (RMM hydrogen =2)
The time taken by gas x : 350 s
Further explanationGraham's law: the rate of effusion of a gas is inversely proportional to the square root of its molar masses or
the effusion rates of two gases = the square root of the inverse of their molar masses:
[tex]\rm \dfrac{r_1}{r_2}=\sqrt{\dfrac{M_2}{M_1} }[/tex]
Molar mass = 2 x vapour density(VD)
r₁=rate Hydrogen = 280 cm³ / 40 s = 7 cm³/s
M₁=molar mass Hydrogen=2 g/mol
M₂=molar mass gas x=
[tex]\tt 2\times VD=2\times 25=50~g/mol[/tex]
[tex]\tt \dfrac{7}{r_2}=\sqrt{\dfrac{50}{2} }\\\\\dfrac{7}{r_2}=5\\\\r_2=1.4~cm^3/s[/tex]
[tex]\tt r_2=\dfrac{V_2}{t_2}\\\\t_2=\dfrac{V_2}{r_2}\\\\t_2=\dfrac{490~cm^3}{1.4~cm^3/s}\\\\t_2=350~s[/tex]
