Answer:
[tex]S^0 \rightarrow S^{+4}+4e^-[/tex]
Explanation:
Hello,
In this case, for the reaction:
[tex]K_2Cr_2O_7 + H_2O + S \rightarrow SO_2 + KOH + Cr_2O_3[/tex]
We first must assign the oxidation state of each element:
[tex]K^{+1}_2Cr^{+6}_2O_7^{+2} + H_2^{+1}O^{-2} + S^0 \rightarrow S^{+4}O_2^{-2} + K^{+1}O^{-2}H^{+1} + Cr_2^{+3}O_3^{-2}[/tex]
Thus, we should remember that the oxidation half-reaction applies for the element undergoing an increase in its oxidation state, such case is sulfur, for which passes from 0 to +4 as shown below:
[tex]S^0 \rightarrow S^{+4}+4e^-[/tex]
It means, that four electrons were lost due to the effect of the strong oxidizing agent, potassium dichromate.
Best regards.
PLEASE!
SEE ATTACHED.
Answer:
Here's what I get
Explanation:
A. Prepare Ca(NO₃)₂ solution
Scoopula — to transfer the solid to an Erlenmeyer flask
Erlenmeyer flask — to hold the solid for weighing and to prepare the solution
Volumetric flask — to hold the liquid
Funnel — to transfer the solution to the volumetric flask
Wash bottle — to fill the volumetric flask to the mark
B. Weigh K₂SO₄
Scoopula — to transfer the solid to a weighing bottle
Weighing bottle — to hold the solid for weighing.
C. Add acetic acid to a volumetric flask
Volumetric flask — to hold the acid
Pipet —to measure out the acid and transfer it to the flask
Pipet bulb — safety feature for the pipet and for control of the acid volume.
D. Add NaOH to an acid
Beaker — to hold the NaOH solution
Ring stand — to hold a buret
Buret clamp — to hold the buret
Funnel — to transfer the solution to a buret
Buret — to hold the NaOH solution for addition to the acid
What does a particular point on a line of a phase diagram represent ?
Answer:
What does a particular point on a line of a phase diagram represent ?
Explanation:
The lines on the phase diagram represent combinations of pressures and temperatures at which two phases coexist in equilibrium.
The phase diagram's lines depict mixtures of pressures as well as temperatures where two phases can peacefully coexist.
What is a phase diagram?A phase diagram shows a visual representation of particular chemical-physical states across various pressures and temperatures.
What is a phase?A phase would be an area of space where a molecule's physical characteristics have been all essentially uniform.
The phase diagram's lines depict mixtures of pressures as well as temperatures where two phases can peacefully coexist.
To know more about the phase diagram
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Is glue a liquid or a solid
Answer:
White school glue is liquid because its long polymers can slide over and along one another. It does not flow easily, though; it is quite viscous. The addition of some chemicals—such as a borax solution (or sodium tetraborate decahydrate dissolved in water)—can cause cross-links to form between the polymers.
Explanation:
Answer:
It is a liquid :]
PLEASEE HELPP ME WITH THIS QUESTION I REALLY NEED A GOOD EXPLANATION AND BE SPECIFIC PLEASE WILL MARK BRAINIEST FOR CORRECT ANSWER!!!!!!!!
QUESTION: Describe the three parts of a seed and give the function of each.
Answer:
The three parts of the seed are the embryo, endosperm and the seed coat.
Explanation:
The embryo is the young multicellular organism before it emerges from the seed. The endosperm is a source of stored food which consists mostly of starches. The seed coat consists of one or more protective layers that encase the seed.
Hope this helps x
What is the purpose of the arrow in a chemical equation?
O A.
It indicates the direction in which the reaction occurs.
Св.
It separates the elements from the compounds.
O C.
It indicates the direction of increase in the number of molecules.
D.
It indicates the direction of heat movement in a reaction.
Reset
Next
Answer:
A) It indicates the direction in which the reaction occurs.
Explanation:
The reason we don't use equals signs (=) in chemical reactions is because of the Identity Property of Equality (if a = b then b = a), which would allow us to reverse reactions. Reactions can't just be reversed (since some don't even occur); we need to know what is reacting to make what. Thus, we use the arrow, or yields symbol to denote this.
The substances to the left of the sign are the reactants, the ones that are reacting, and the ones on the right are the products, the ones that are being produced from the reactants. The arrow is an excellent way to represent the direction the reaction occurs in as the way it's written clearly demonstrates direction.
Hope this helps!
At which electrade in a voltaic cell does redaction always occar?
Answer:cathode
Explanation:It is also known as the galvanic cell or electrochemical cell. In the voltaic cell, the oxidation occurs at an anode which is a negative electrode and the reduction occurs at the cathode which is a positive electrode.
David prepared the potassium phosphate solution by adding 46.3g to 250 mL of water. Kim needs 0.10M potassium phosphate solution. How many stock solutions does she need if she wants to mix 150 ml of diluent?
Answer:
17.2mL
Explanation:
Step 1:
Determination of the molarity of potassium phosphate K3PO4 solution.
This is illustrated below:
Mass of K3PO4 = 46.3g
Molar Mass of K3PO4 = (39x3) + 31 + (16x4) = 212g/mol
Mole of K3PO4 =..?
Mole = Mass /Molar Mass
Mole of K3PO4 = 46.3/212 = 0.218 mole
Volume of water = 250mL = 250/1000 = 0.25L
Molarity = mole /Volume
Molarity of K3PO4 = 0.218/0.25
Molarity of K3PO4 = 0.872M
Step 2:
Determination of the volume of the stock solution of K3PO4 needed.
Molarity of stock solution (M1) = 0.872M
Volume of stock solution needed (V1) =..?
Molarity of diluted solution (M2) = 0.1M
Volume of diluted solution (V2) = 150mL
The volume of the stock solution needed can be obtained as follow:
M1V1 = M2V2
0.872 x V1 = 0.1 x 150
Divide both side by 0.872
V1 = (0.1 x 150)/0.872
V1 = 17.2mL
Therefore, the volume of the stock solution needed is 17.2mL
what is the mass of oxygen in 10g of water
Answer:
8.90g
Explanation:
2×O=2×16.00=32.00g
mass=0.278×32.00g=8.90g
In a solution at 25 degrees Celsius the H is 3.5 x 10^-6 M. What is the OH
Answer:
Explanation:
[ H⁺] = 3.5 x 10⁻⁶ M .
[ H⁺] [ OH⁻] = 10⁻¹⁴
[ OH⁻] x 3.5 x 10⁻⁶ = 10⁻¹⁴
[ OH⁻] = 2.857 x 10⁻⁹ M .
We now consider three moles of ideal gas at the same initial state (3.0 L at 273 K). This time, we will first perform an isobaric compression, then an isothermal expansion to bring the gas to the final state with the same volume of 3.0 L, and at temperature 110 K. Hint (a) How much work (in J) is done on the gas during the isobaric compression? Wcompression = J (b) How much work (in J) is done on the gas during the isothermal expansion? Wexpansion = J
Answer:
Explanation:
check the image
a)
The workdone on the gas during during the isobaric compression
W = pΔV
= nRΔT
= 2 * 8.314 * (273-110)
=2710J
b) The workdone on the gas during during the isothermal expansion
[tex]W= nRT_fIn(\frac{V_f}{V_i} )\\\\2*8.314*110In\frac{110}{273} \\\\=-1662.6J[/tex]
Answer:
a) The work done during the isobaric compression is 4060.91 J.
b) The work done during the isothermal expansion is 2489.58 J.
Explanation:
a) Here we have two different processes. We calculate the work done during the isobaric compression using the following formula:
[tex] W= -P. (V₂ - V₁) [/tex]
Since the process is isobaric, the pressure is constant. First we need to find this value. In order to do that, we use the ideal gas equation:
[tex] p.V= n.R.T [/tex]
[tex] p= [n.R.T] ÷ V = [3 mol × 0.082 (L.atm÷mol.K) × 273 K] ÷ 3 L [/tex]
p = 22.39 atm
Now, we need to find V₂. We do this using Charles' law:
[tex] V₁/T₁ = V₂/T₂ [/tex]
[tex] V₂ = V₁/T₁ × T₂ = 3 L ÷ 273 K × 110 K [/tex]
V₂ = 1.21 L
Now we are in condition to calculate the work done during the isobaric compression:
[tex] W= -P. (V₂ - V₁) [/tex]
[tex] W= -22.39 atm. (1.21 - 3) L [/tex]
W= 40. 07 L.atm
We multiply this value by 101.325 to convert it to joules: W= 4060.91 J
b) To calculate the work done during the isothermal expansion, we use the following equation:
[tex] W = n.R.T. ln (V₂/V₁) [/tex]
[tex] W = 3 mol ×0.082 (L.atm/mol.K) × 110 K × ln (3L / 1.21 L) [/tex]
W= 24.57 L.atm
We convert this value to joules: W= 2489.58 J
A solution with a concentration of 0.0640 g/L CsOH contains 1.260 g CsOH. What is the volume of the solution?
Answer:
19.7 L
Explanation:
Answer:
The answer is 19.7
Explanation:
1. A chemical reaction is taking place between two reactants dissolved in a liter of water. If an
additional liter of pure water is added to the reaction mixture, what will be the effect on the
reaction rate?
Answer: The reaction rate will DECREASE.
Explanation:
Chemical reaction occurs through the combination of chemical reactants to form new products. The rate if this reaction is affected by the following factors:
- the chemical nature of the reacting substances,
- the state of subdivision (one large lump versus many small particles) of the reactants,
- the temperature of the reactants,
- the concentration of the reactants, and
- the presence of a catalyst.
When additional liter of pure water is added to the reaction mixture, collision between reactant molecules is reduced The dilution causes the concentration of the reactants to reduce. This in turn affects the rate of chemical reactions as the decreased concentration of reactants leads to a decrease in the reaction rate.
An unknown substance has a melting point of -77°C. Is this substance likely to be an ionic compound?
Answer:
No. it,s not possible.
Explanation:
Because you know that ionic compound is having large inter-molecular forces. -77C* is for a compound having v.very small inter-molecular forces.you must know that M.B is directly varing with inter-molecular forces.
Which compound has the highest boiling point? Ethane, Propane, Butane, Pentane, Hexane
Answer:
Hexane
Explanation:
These are hydrocarbons from the same group with general formula CnH2n+2.
So, the more molecular mass are (the more number of carbons) the higher boiling point will be.
Hexane has the most number of carbon atoms(6) , so the highest molecular mass and the highest boiling point.
a container holds four times as many moles of CO2 as O2. if the total pressure in the container is 20. atm, what is the pressure exerted by carbon dioxide?
Answer:
The answer is "16"
Explanation:
In the question given, it asks about the partial carbon dioxide ([tex]CO_2[/tex]) pressure, which is directly related to the oxygen ([tex]O_2[/tex]) to carbon dioxide ([tex]CO_2[/tex]) mole ratio, which is 1 to 4.
Hydrogen sulfate reacts with gallium chlorate to produce hydrogen chlorate and gallium sulfate(write the balanced chemical equation,and word reaction)
Answer:
[tex]3H_2S+2Ga(ClO_3)_3\rightarrow Ga_2S_3+6HClO_3[/tex]
Explanation:
Hello,
In this case, the described chemical reaction is:
[tex]H_2S+Ga(ClO_3)_3\rightarrow Ga_2S_3+HClO_3[/tex]
After balancing, we must assure the same quantity of atoms of all the elements at both reactants and products:
[tex]3H_2S+2Ga(ClO_3)_3\rightarrow Ga_2S_3+6HClO_3[/tex]
Thus, we find two galliums, three sulfurs, six chlorines, six hydrogens and eighteen oxygens at both reactants and products.
Best regards.
Balance the equation below, using the smallest whole-number coefficients. ____Fe(s) + ____ O2(g) + ____ H2O(l) → ____Fe(OH)2(s)
Answer:
2Fe(s) + O₂(g) + 2H₂O(l) → 2Fe(OH)₂(s)
Explanation:
Balanced equation willl be:
[tex]2Fe(s) + O_2(g) + 2H_2O(l) - > 2Fe(OH)_2[/tex]
What is balance equation with example?A balanced chemical equation occurs when the number of the atoms involved in the reactants side is equal to the number of atoms in the products side. In this chemical reaction, nitrogen (N2) reacts with hydrogen (H) to produce ammonia (NH3). The reactants are nitrogen and hydrogen, and the product is ammonia.
What is the rule of balance?On a separate sheet of paper, make a claim in which you mathematically state the rule of balance - that is, the rule that one must use to determine if two weights placed on opposite sides of the fulcrum will balance each other.
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Combustion of hydrocarbons such as undecane (C_11H_24) produces carbon dioxide, a "greenhouse gas." Greenhouse gases in the Earth's atmosphere can trap the Sun's heat, raising the average temperature of the Earth. For this reason there has been a great deal of international discussion about whether to regulate the production of carbon dioxide.
1. Write a balanced chemical equation, including physical state symbols, for the combustion of liquid undecane into gaseous carbon dioxide and gaseous water.
2. Suppose 0.260 kg of undecane are burned in air at a pressure of exactly 1 atm and a temperature of 13.0°C. Calculate the volume of carbon dioxide gas that is produced. Be sure your answer has the correct number of significant digits.
Answer:
Volume of carbon dioxide is 428.23 L.
Explanation:
Below is the chemical reaction or chemical equation for the combustion of hydrocarbons such as undecane into carbon dioxide.
[tex]C_{11}H_{24}(l) + 17O_{2}(g) \to 11CO_{2} (g) + 12H_2O(g)[/tex]
Here, undecane is in liquid form that reacts with gaseous oxygen (combustion) and produces carbon dioxide and water as a product in the gaseous form.
The molar mass of undecane = [tex]156.31 g/mol.[/tex]
[tex]\text{Number of moles} = \frac{260g}{156.31g/mol} = 1.66 \ mol.[/tex]
From the equation, it can be seen that 1 mole of undecane produces 11 moles of carbon dioxide. Therefore, 1.66 mol will produce 18.26 mol of carbon dioxide.
Now find the volume of 18.26 mol of carbon dioxide when the temperature is 13 degrees Celsius and pressure is 1 atm.
[tex]V = \frac{nRT}{P} \\[/tex]
[tex]V = \frac{18.26 \times 0.082 \times 286 \ K}{1atm} \\[/tex]
[tex]V = 428.23 \ L[/tex]
Select the correct image
Trees with light brown bark dominate an ecosystem. The ecosystem has populations of insects that thrive on the tree bark. Over time, some
Insect species developed certain physical characteristics that helped them thrive on the tree bark. These physical characteristics also helped the
Insects defend themselves from predators. Which insect species is probably the species with the new physical characteristics?
Answer:
I think the insect would be the one in the second photo reading from left to right
Explanation:
the other insects:
the first of the first photo is a change of what would be the external surface of the insect, it is not the insect itself.
In the third photo, the insect has short legs with little grip, which indicates that it does not climb large areas on top, and finally, the 4 image is of an insect that lives in desert areas and is poorly coordinated in areas of high heat. and sand.
These are the reasons why I chose photo number two reading from left to right
Answer:
I would say that your answer would be the second one.( the red one)
Explanation:
because the legs it has seem like it would grip onto trees fairly well.
How does a dna molecule make a copy of itself
Answer:
See below
Explanation:
The process through which DNA replicates itself in the course of the cell division shall be DNA replication. There was a mistake. A 'Y' shape is generated by the separation of the two individual DNA strands called a 'field' replication. These two different strands act as models for the creation of new DNA strands
Hope this helps.
Which is an example of antiracist behavior?
A. Tyler smiles at a joke made in his driver education class about Asian drivers.
B.Tyler makes a joke about the high number of African Americans dropping out of school.
C.Tyler suggests that an ethnic studies course be taught at his school
D. All of the above
Answer:
C.
Explanation:
In C.) Tyler is not suggesting that one race is better than another he is only suggesting his own non biased opinion on what courses should be taught at his school.
Answer:
Explanation:
C
Olivia, a Latina student, is told that she can check only two books out of the library at a time, but Leann, a white student, is told that she can check out as many books as she wants. The best way for a white person to help end this type of white privilege is to say:
A. that this difference in treatment should stop now .
B. that it's better than it used to be
C. that it's worse in other countries
D. that people of color are overly sensitive .
Answer:
a
Explanation:
the others are rude, and rather support this, while a helps to support the ending of white privlige
Answer:
A. Definitely!
Explanation:
If everyone says that in other country that's worst and let it go, racism will never stop! Saying that people of color are overly sensitive is also racist because everyone can be sensitive. There color of skin change nothing! They are humans like everyone and if they want to defend themself, they have the right! Racism still exist and it needs to stop after all these years of sufferance and pain. White people are not better that people of color. Everyone deserve to be equal. Thank you.
Identify the conjugate base in each pairs
1)RCOOH. RCOO
2)H2PO+. H2PO4
3)RNH2.RNH3+
4)H2CO3.HCO3-
Answer: 1) [tex]RCOO^-[/tex]
2) [tex]H_2PO_4^-[/tex]
3) [tex]RNH_2[/tex]
4) [tex]HCO_3^-[/tex]
Explanation:
According to the Bronsted-Lowry conjugate acid-base theory, an acid is defined as a substance which looses donates protons and thus forming conjugate base and a base is defined as a substance which accepts protons and thus forming conjugate acid.
1) [tex]RCOOH\rightarrow RCOO^-+H^+[/tex]
Here, [tex]RCOOH[/tex] is loosing a proton, thus it is considered as an acid and after losing a proton, it forms [tex]RCOO^-[/tex] which is a conjugate base.
2) [tex]H_3PO_4\rightarrow H_2PO_4^-+H^+[/tex]
Here, [tex]H_3PO_4[/tex] is loosing a proton, thus it is considered as an acid and after losing a proton, it forms [tex]H_2PO_4^-[/tex] which is a conjugate base.
3) [tex]RNH_3^+\rightarrow RNH_2+H^+[/tex]
Here, [tex]RNH_3^+[/tex] is loosing a proton, thus it is considered as an acid and after losing a proton, it forms [tex]RNH_2[/tex] which is a conjugate base.
4) [tex]H_2CO_3\rightarrow HCO_3^-+H^+[/tex]
Here, [tex]H_2CO_3[/tex] is loosing a proton, thus it is considered as an acid and after losing a proton, it forms [tex]HCO_3^-[/tex] which is a conjugate base.
Ca+HCI—>CaCI2+H2, what is the reaction?
Answer:
single replacement reaction
Explanation:
This is a kind of single replacement reaction where you switch either cations or anions. Here you switched Ca for H and produced Cacl2 and H2 gas by itself.
Answer:
It is a displacement reaction
why do we need to standardize EDTA in determination of water hardness?
Answer:
a specific amount edta is added to a specific amount of distilled water
Explanation:
calculate the number of chloride ions in 6.8 g of zinc chloride
Answer:
The correct answer is 0.300 * 10^23 ions.
Explanation:
Based on the given question, there is a need to find the number of chloride ions in the mentioned 6.8 grams of zinc chloride compound.
The moles of zinc chloride (ZnCl2) is,
= mass of zinc + 2 mass of chlorine
= 65.38 + 2 (35.45)
=65.38 + 70.90
= 136.28 grams (The molecular mass of zinc is 65.38 and the molecular mass of chlorine is 35.45)
Thus, 136.28 g of ZnCl2 contains 70.90 grams of chlorine
Therefore, 6.8 grams of ZnCl2 will comprise = (70.90/136.28) * 6.8
= 3.537 g of chlorine
70.90 g of Cl comprise 6.022*10^23 chlorine, thus, 3.537 g of Cl will comprise (6.022*10^23/70.90) * 3.537
= 0.300 * 10^23 ions of chlorine.
How many bonding electrons are present in PO43- ?
Justine’s hair dryer has a resistance of 20 Ohms when first turned on. How much current does the hair dryer draw from the 110.-V line in Justine’s house? (Answer in amps)
Answer:
5.5 amps
Explanation:
V = I*R
110 = 20I
I = 5.5
Calculate the pH of a solution having the following ion concentrations at 298 K. [H+] = 4.6 × 10^-2 M
Answer:
The pH of the solution is 1.34, being an acidic pH.
Explanation:
pH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance. The acronym pH stands for hydrogen potential.
The pH scale ranges from 0 to 14. Values less than 7 indicate the acidity range and those greater than 7 indicate alkalinity or basicity. Value 7 is considered neutral. Mathematically, pH is the negative logarithm of the molar concentration of hydrogen or proton ions (H⁺) or hydronium ions (H₃O⁺).
pH= - log [H⁺] = - log [H₃O⁺]
In this case, [H⁺]= 4.6*10⁻² M. Replacing:
pH= - log 4.6*10⁻²
Solving:
pH= 1.34
The pH of the solution is 1.34, being an acidic pH.
Write the formula of the conjugate base for acid HF. Express your answer as a chemical formula or an ion. nothing Request Answer Part B Write the name of the conjugate base found in part A. Spell out the full name of the compound or ion. Request Answer Part C Write the formula of the conjugate base for acid H2O. Express your answer as a chemical formula or an ion. nothing Request Answer Part D Write the name of the conjugate base found in part C. Spell out the full name of the compound or ion. Request Answer Part E Write the formula of the conjugate base for acid H2CO3. Express your answer as a chemical formula or an ion. nothing Request Answer Part F Write the name of the conjugate base found in part E. Spell out the full name of the compound or ion. Request Answer Part G Write the formula of the conjugate base for acid HSO−4. Express your answer as a chemical formula or an ion. nothing Request Answer Part H Write the name of the conjugate base found in part G. Spell out the full name of the compound or ion.
Answer:
Explanation:
HF acid
F ⁻ conjugate base , name is fluoride ion .
H₂O acid
OH⁻ conjugate base , name hydroxide ion
H₂CO₃ acid ,
HCO₃⁻ conjugate base , name bicarbonate ion .
HSO₄⁻ acid bisulphate ion
SO₄⁻² ion , conjugate base ,name sulphate ion .