Answer:
Salt bridge
Explanation:
Salt bridge is used in an electrolytic cell to transfer electrons from the anode to the cathode.
Salt bridge are used because they do not interfere with the constituents of the cell I.e the anode (+very electrode) and cathode(-ve electrode).
Examples of salt bridges are AgNO₃, KCl etc.
Salt bridge can be described as a tool used to link the oxidation half cell and reduction half cell in an electrolytic set-up or galvanic cell.
does temperature and pressure affect the solubilty of any solute
Answer:
Yes very much so, especially gases
Explanation:
Solubility of gases decrease with increasing pressure. Be familiar with Henry's Law.
- Hope that helps! Please let me know if you need further explanation.
Answer:
Yes, it does.
How are renewable fuels different from fossil fuels
Answer:
Renewable energy
Explanation:
on the other hand, typically emits less CO2 than fossil fuels. In fact, renewables like solar and wind power—apart from construction and maintenance—don't emit any CO2 at all. With renewable energy, you can breathe easier, stay cooler, and create a more comfortable world for generations to come.
Answer:
renewable energy comes from natural resources that can be replenished or replaced during an average human lifetime ; eg, Hydro, solar, wind etc.
fossil fuels can take thousands or even millions of years to naturally replenish; eg, natural gas, coal, oil.
Find [H3O+], [OH-], & pOH for a window-cleaning solution whose pH is 4.33.
Answer:
[tex][H_3O^+] = 1*10^{-4.33} \ M[/tex][tex][OH^-] = 1*10^{-9.67} \ M[/tex][tex]pOH = 9.67[/tex]Explanation:
Given;
pH of the solution = 4.33
H₃O+ is calculated as;
pH = -log[H₃O⁺]
4.33 = -log[H₃O⁺]
-4.33 = log[H₃O⁺]
10⁻⁴°³³ = [H₃O⁺]
[tex]Thus, [H_3O^+] = 1 *10^{-4.33}[/tex] M
[OH⁻] is calculated as;
[H₃O⁺] x [OH⁻] = 10⁻¹⁴
10⁻⁴°³³ x [OH⁻] = 10⁻¹⁴
[tex][OH^-] = \frac{10^{-14}}{10^{-4.33}} = 10^{-9.67}\\\\Thus, [OH^-] = 1*10^{-9.67} \ M[/tex]
pOH of the solution is calculated as;
pOH + pH = 14
pOH + 4.33 = 14
pOH = 14 - 4.33
pOH = 9.67
Thus, pOH of the solution is 9.67
Summary of the calculation:
[tex][H_3O^+] = 1*10^{-4.33} \ M[/tex][tex][OH^-] = 1*10^{-9.67} \ M[/tex][tex]pOH = 9.67[/tex]Na2O+H2O= 2NaOH how many grams of Na2O are required to produce 1.06*10^2 grams of NaOH
Answer:
77.5 grams of Na2O
Explanation:
Convert grams to mols.
1.06 x 10^2 grams x 1 mol NaOH/39.99
= 2.50 mols NaOH
Find the mole ratio of NaOH and Na2O
1:2
Convert mols NaOH to Na2O mols
2.50 mols NaOH x 1 mol Na2O/2 mols NaOH
= 1.25 mols Na2O
Convert to grams
1.25 mols Na2O x 61.98 grams Na2O/1 mol
= 77.5 grams Na2O required to produce 1.06 x 10^2 grams of NaOH
What is the law of redox reactions?
Answer:
. All redox reactions occur with a simultaneous change in the oxidation numbers of some atoms. At least two elements must change their oxidation numbers. When an oxidation number of an atom is increased in the course of a redox reaction, that atom is being oxidized
Explanation:
What happens to a neutral atom when an electron leaves
Compare and contrast monoprotic and polyprotic acids.
Select the single best answer.
Predict the pH (> 7, < 7, or = 7) of a LiHCO3 solution.
Answer:
LiHCO3 its PH >7
Explanation:
the real ph for it is 11.3 so it makes it more than 7
and if you know it is a conjugate base coming from the weak acid H2CO3 so LiHCO3 is a base
Convert 4.6 atm to mmHg.
A student dissolves 20g of potassium chloride in 100cm³ of water in a beaker. What is the concentration of the solution in g/dm³?
Answer:
The concentration of the solution is 2 g/dm³
Explanation:
The equation used to find the concentration of a solution is "c = m/v"
C= concentration
M= mass
V= volume
The question asks for the answer to be in decimeters, so you need to 100 cm³ to dm³. To do this, you divide 100 by 10, giving you 10 cm³. Then you just plug in your numbers into the formula: c = 20g/10dm³.
The concentration of the potassium chloride solution has been [tex]\rm 2\;\times\;10^-^3\;g/dm^3[/tex].
The concentration has been defined as the mass of sample present in a definite volume of the solution. The concentration has been given by the moles, molarity, g/ml, g/L etc.
The concentration attained by the student has been by dissolving 20 g of KCl in [tex]\rm 100\;cm^3[/tex] water has been given in [tex]\rm g/cm^3[/tex] as:
[tex]\rm \dfrac{g}{cm^3}=\dfrac{20\;g}{100\;cm^3}\\ \dfrac{g}{cm^3}=0.2\;g/cm^3[/tex]
The concentration of the solution obtained by the student has been [tex]\rm 0.2\;g/cm^3[/tex].
The conversion of [tex]\rm cm^3\;to\;dm^3[/tex] has been given as:
[tex]\rm 1\;g/cm^3=0.001\;g/dm^3[/tex]
The concentration of [tex]\rm 0.2\;g/cm^3[/tex] solution has been given as:
[tex]\rm 1\;g/cm^3=0.001\;g/dm^3\\0.2\;g/cm^3=0.2\;\times\;0.001\;g/dm^3\\0.2\;g/cm^3=2\;\times\;10^-^3\;g/dm^3[/tex]
The concentration of the potassium chloride solution has been [tex]\rm 2\;\times\;10^-^3\;g/dm^3[/tex].
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I am at the centre of the atom and contain both neutrons and protons. What am I?
and
Complete the sentence:
Atoms have no overall
charge because...
Answer:
Nucleus and atoms have no overall charge because each element has the same number of protons and electrons which cancel out each other.
A chemistry student mixes 25 milliliters of 3.0 M hydrochloric acid (HCl) with excess sodium hydroxide. The chemicals react according to this chemical equation:
HCl + NaOH → NaCl + H2O.
If the volume of the resulting solution is 68 milliliters, what is the concentration of sodium chloride?
Answer:
1.1 mol/liter
Explanation:
You would use the M1V1 = M2V2 equation to solve this.
We know M1 is 3.0 M, V1 is 25 milliliters, and V2 is 68 milliliters. We need to find M2.
To find M2, first plug in what you know.
(3.0 M)(25 mL) = M2(68 mL)
Then, divide everything by 68 mL to get M2 by itself
Your answer should be a quite large decimal but I rounded it to 1.1 mol/liter.
Answer:
The concentration of sodium chloride is 1.1 moles/liter.
Explanation:
Unlike bacteria, an animal cell contains
Answer:
Membrane
Explanation:
Unlike a bacteria , an animal cell contains membrane which bounds organelles.
What is the value for AG at 500 Kif AH = 27 kJ/mol and AS = 0.09 kJ/(mol-K)?
Answer: -18
Explanation:
Facts
What is the value for ΔG at 500 K if ΔH= 27 kJ/mol and ΔS = 0.09 kJ/(mol⋅K)?
Explanation: ΔG= -18 kJ/mol
Atom X contains seven protons and seven neutrons. Atom Z contains seven and eight neutrons. Which of the following statemenats correctly describes the two atoms?
A.They are isotopes
B.They are radioactive
C.They are atims of different elements.
D. They have the same mass number
Piz help!!!!
Answer:
A. They are isotopes.
Explanation:
An isotope is an element with the same number of protons but different number of neutrons resulting in a varied mass number/molecular weight.
Help me, I don’t understand
Answer:
option c
Explanation:
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What is the % of each element in Ni3{PO4) 2 ?
Answer:
nickel 48.1063%
Phosphorus 16.9245%
Oxygen 34.9692%
The percent composition of each element like nitrogen, oxygen and phosphorous in Ni₃(PO₄)₂ are 48.03%, 34.97% and 16.93% respectively.
How do we calculate % composition?Percent composition of any element present in any compound will be calculated as:
% comosition = (Mass of element / Mass of compound)×100%
Mass of Ni₃(PO₄)₂ compound = 366.02 g/mol
Molar mass of 3 Nitrogen atoms = 3×58.6 = 175.8 g/mol
Moar mass of 2 Phosphorous atoms = 2×31 = 62 g/mol
Moar mass of 8 Oxygen atoms = 8×16 = 128 g/mol
% comosition of Nitrogen = (175.8/366.02)×100% = 48.03%
% comosition of Oxygen = (128/366.02)×100% = 34.97%
% comosition of Phosphorous = (62/366.02)×100% = 16.93%
Hence % composition of nitrogen, oxygen and phosphorous is 48.03%, 34.97% and 16.93% respectively.
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How many senses does the human body have?
O A. 3
B. 5
Answer:
B
Explanation:
sight, hearing, smell, taste and touch
Answer:
Most easiest answer..
There are 5 senses in human body.☺️
If 8 moles of FeCl react with 8 moles of O2 what is the limiting reactant?
4FeCl3 + 302—2Fe2O3 + 3Cl2
A) FeCl3
B) 02
C) Fe203
D) Cl2
Answer:
A) FeCl₃
Explanation:
The only unclear part here is what the product is meant to be. But, I will put in the limiting reactant for both cases.
4 FeCl₃ + 3 O₂ ⇒ 2 Fe₂O₃ + 3 Cl₂
For Fe₂O₃:
Use the stoichiometry from the chemical equation to solve this problem.
You need 4 moles of FeCl₃ to make 2 moles of Fe₂O₃.
8 × (2/4) = 4 moles
You need 3 moles of O₂ to make 2 moles of Fe₂O₃.
8 × (2/3) = 5.3 moles
Since FeCl₃ made less product, it is the limiting reactant.
For Cl₂:
Do the same as above.
You need 4 moles of FeCl₃ to make 3 moles of Cl₂.
8 × (3/4) = 6 moles
You need 3 moles of O₂ to make 3 moles of Cl₂.
8 × (3/3) = 8 moles
Since FeCl₃ made less product, it is the limiting reactant.
Answer:
A) FeCl₃
Explanation:
Hope this helps
Use the term DNA in a sentence
about proteins.
The organic materials which are present in all organisms in the form of DNA or RNA are called nucleic acids. It is the basic genetic material of our body.
What is DNA?The group of molecules which are responsible for carrying and transmitting the hereditary characters or the genetic information from parents to the offsprings is known as Deoxy-ribonucleic acid or DNA.
The DNA is a polynucleotide molecule, the polypeptide chains are further folded in secondary, tertiary and quaternary structures to form different proteins. Every organism contains many genes in its DNA, different types of proteins can be formed.
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Give the value of the quantum number ℓ, if one exists, for a hydrogen atom whose orbital angular momentum has a magnitude of 6√(h/2π).
Answer:
For this angular momentum, no quantum number exist
Explanation:
From the question we are told that
The magnitude of the angular momentum is [tex]L = 6\sqrt{\frac{h}{2 \pi} }[/tex]
The generally formula for Orbital angular momentum is mathematically represented as
[tex]L = \sqrt{(l * (l + 1)) } * \frac{h}{2 \pi}[/tex]
Where [tex]l[/tex] is the quantum number
now
We can look at the given angular momentum in this form as
[tex]L = 6\sqrt{\frac{h}{2 \pi} } = \sqrt{36} * \sqrt{\frac{h}{2 \pi}} }[/tex]
comparing this equation to the generally equation for Orbital angular momentum
We see that there is no quantum number that would satisfy this equation
An example of a double replacement chemical reaction takes place in batteries. In an alkaline battery, Manganese oxide reacts with water to form a different manganese oxide and hydroxide. Which is the correct balanced equation for this?
Answer:
2MnO2 + H2O => Mn2O3 + 2OH is the correct balanced equation.
When manganese oxide reacts with water to form a different manganese oxide and hydroxide, the correct balanced equation for this is 2MnO₂ + H₂O ⇾ Mn₂O₃ + 2OH.
What do you mean by balanced chemical equation ?The term balance chemical equation is define as the equation which satisfy the law of conservation of mass, i.e., “Total mass of the products is equal to the total mass of all the reactants”.
If a chemical equation is not balanced, it will break the law of conservation of mass. It will indicate that either mass is created or destroyed, which is impossible.
Balanced chemical equations have the equal number and type of each atom on both sides of the equation.
Thus, When manganese oxide reacts with water to produce a different manganese oxide and hydroxide, the correct balanced equation for this reaction is 2MnO₂ + H₂O ⇾ Mn₂O₃ + 2OH.
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Identify earths lithospheric plates
Answer:
Lithospheric plates are regions of Earth's crust and upper mantle that are fractured into plates that move across a deeper plasticine mantle. Earth's crust is fractured into 13 major and approximately 20 total lithospheric plates.
Explanation:
I hope this helps
pH of a 0.00072 M HCl solution.
Answer:
3.14
Explanation:
pH=-log(H+)
- Hope that helps! Please let me know if you need further explanation.
Does anyone know how to solve this
Answer:
Beta
Explanation:
Beta has signal 0 above and -1 under
1. After clamping a buret to a ring stand, you notice that the set-up is tippy and unstable. What should you do to stabilize the set-up?
A. Move the buret clamp to a ring stand with a larger base.
B. Hold the buret in place by hand during the titration.
C. Use a different size buret that is more stable in the set-up
D. Clamp another buret to the ring stand to balance out the set-up.
Answer:
A. Move the buret clamp to a ring stand with a larger base.
Explanation:
The ring stands are used to hold burettes, light in weight to avoid loss of stability, that is why it is necessary to change the size of the ring stand so that it can support the buret that we are going to use. It is not recommended to balance it with the hand since it would give us an inaccurate result in the titration.
In order to stabilize the set-up, one has to move the buret clamp to a ring stand with a larger base.
The ring stand or the retort stand simply means an equipment that is used in supporting other equipment and glassware such as test tubes, flasks and burettes.In this case, since the the set-up is tippy and unstable, then it's possible that the ring size doesn't fit and one will need to move the buret clamp to a ring stand that has a larger base.In conclusion, the correct option is A.
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(Multiple Choice, 30 pts)
A student thinks that halogens are highly reactive because their electrons are weakly attracted to their nuclei. Which is evidence that disputes this student's idea?
A. Halogens react with alkali metals.
B. Halogens cannot react with noble gases.
C. Halogens tend to attract electrons when bonding.
D. Halogens have a full octet of electrons.
Answer:
c
Explanation:
¨Halogens being non metals have greater electronegativities hence, attract electrons and making the statement disputed. Nobel gases are highly stable; this explains why they are nonreactive. They do not form chemical bonds because they only have a little tendency to either gain or lose an electron; on the other hand, halogens are reactive because they only need one additional electron to complete their octet. ¨
i found that from another users answer for the same question
Answer:
answer c
Explanation:
What structure in a bacterial cell controls which substances enter and leave the cell?
Answer:
A cell membrane. A cell structure that controls which substances can enter or leave the cell. (found in all cells) In cells with cell walls, the cell membrane is located just inside the cell wall. In other cells, the cell membrane forms the outside boundary that separates the cell from its environment.
Hope this helps!
I am a subatomic particle
that is positively charged what am I?
The right answer is Proton.
Additional Information:
There are three types of subatomic particles. They are:
ProtonElectronNeutronProton is a positively charged particle,Electron is negatively charged particle and Neutron is charge less.
Hope it will be helpful to you...
rank the following in order of the packing of particles (density) from greatest to least:
solid
liquid
gas
