Answer:
two valence states: trivalent chromium (Cr III) and hexavalent chromium (Cr VI)
hope this helps, i can change it if it doesn't.
60 points! please help me! i will appreciate it
Answer:
[tex]\huge\boxed{\sf v = 0.017 \ L}[/tex]
Explanation:
Given Data:
Mass = m = 0.08 g
Molar mass of C₂H₂F₄ = (12×2) + (1×2) + (19×4)
= 24 + 2 + 76 = 102 g/mol
Pressure = P = 1.14 atm
Temperature = T = 19.1 °C + 273 = 292.1 K
Gas Constant = R = 0.08206 L atm K⁻¹ mol⁻¹
Required:
Volume = v = ?
Formula:
Pv = nRT
Solution:
Firstly, finding moles (n)
[tex]\displaystyle n = \frac{mass}{molar \ mass} \\\\n = \frac{0.08 }{102} \\\\n =0.0008 \ mol[/tex]
Now, Finding volume (v)
Rearranging formula
[tex]\displaystyle v = \frac{nRT}{P} \\\\v = \frac{(0.0008)(0.08206)(292.1)}{1.14} \\\\v = \frac{0.019}{1.14} \\\\v = 0.017 \ L\\\\\rule[225]{225}{2}[/tex]
4. The students predict that the reaction will release a lot of energy. What question could help
provide support for the prediction?
Take a reaction among lime water
[tex]\\ \rm\rightarrowtail CaO+H_2O=Ca(OH)_2[/tex]
If it releases heat
The question must include
+Heat sign or ∆ symbol∆H must be +veAnswer:
hope it's helpful to you
The process that breaks down granite into sediment is deposition
True
false
Complete the mechanism for the reaction of butanone with NaBH4 followed by the addition of aqueous acid. Butanone is a 4 carbon chain where carbon 2 is double bonded to oxygen. This reacts with N a B H 4, followed by H 3 O plus to give the final product. Step 1: draw curved arrows. ⟶ Step 2: Draw the charged organic intermediate product. Include nonbonding electrons and charges. Omit the counterion. −→−−H3O+ Step 3: Draw the final product
The formation of a primary alcohol from a ketone involves the use of a ketone and NaBH4 followed by an acid workup.
Formation of a primary alcoholThe question is unclear but clearly relates to the formation of a primary alcohol. The first step in this reaction is the attack of the NaBH4 on the carbonyl carbon of butanone.
The reaction sequence is completed by an acid work up in which an acidic hydrogen is abstracted by the nucleophile to yield a primary alcohol.
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what is the molarity of a solution in which 65.3 NaNO3, are disssolved in enough water to make 1250 mL of solution?
Answer:
1242
Explanation:
We have more solid volatiles than our other giant members.
what planet is this or planets
Answer:
Jupiter
Explanation:
it's big and the ring around it
The colour of outer zone of candle flame is _________.
A. orange
B. blue
C. red
D. yellow
Answer:
Explanation:
At the outer zone of candle flame, there are more oxygen available for the combustion reaction. So the flame is yellow in color.
The answer is D. yellow.
Answer:
B. blue
Explanation:
The candle's flame is divided into three zones: blue on the outside, yellow in the midst, and black on the inside. This is the result of the wax that is formed after the meltdown of the candle.
I am joyous to assist you at any time.
How is the hfusion used to calculate the energy needed to melt a mass of
solid?
Answer:
You can use fusion to measure the amount of energy required to melt a given amount of a solid at its melting point temperature.
Explanation:
A chemist wants to make a solution using a crystalline solid and water. Which action would speed up the solution-making process?
A
Heat the water while adding the crystalline solid.
B
Slowly cool the water while adding the crystalline solid.
C
Divide the water into smaller batches, adding a little of the solid to each.
The action that would speed up the solution making process is : ( A ) Heat the water while adding the crystalline solid
Ways to increase solution making processWhen preparing a solution or trying to dissolve a crystalline solid in water there are three ways which can be used to speed up the solution making process or dissolving the solid faster. and they are
Increase in temperature of water Divide the solid into smaller particles before adding them Increasing the stirring rateFrom the options listed above the best action is to heat the water while adding the crystalline solid.
Hence we can conclude that The action that would speed up the solution making process is : ( A ) Heat the water while adding the crystalline solid.
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Answer: A
Explanation: heat the water
Use the bond energy to calculate an approximate value of δh for the following reaction. Which is the more stable form of fno2?
The enthalpy of reaction or ∆H reaction is the difference between the bond energy of the reactants and the bond energy of the products.
What is ∆H reaction?The term ∆H reaction refers to the heat that is evolved or absorbed in a chemical reaction. It is also known as the enthalpy of reaction.
The question is incoherent but I will try to answer as much as possible. Using the values of bond energy, ∆H reaction = Bond energy of reactants - bond energy of products. This will give us the enthalpy of reaction.
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How many potassium ions are needed to bond with a phosphate ion?.
Two compounds might have spots with the same rf value in a chromatography experiment and not be identical compounds. Which proposed chromatography experiment could best help determine whether the compounds are identical?.
The repeat of the original chromatography experiment with a different solvent might could best help determine whether the compounds are identical.
What is chromatography?Chromatography is a technique used in the laboratory to physically separate two different objects and/or materials.
In chromatography, these materials are separated into two phases called the stationary phase and the movement phase.
Chromatography is also used to purify a given substance and thus determine its exact composition.
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What are the solutions to problems caused by nitrogen gas in solution at certain depths?
Please Help!!!! 50 points
The solutions to problems caused by nitrogen gas in solution at certain depths is by discouraging deep diving.
What is Diving?
This involves moving around under water with the aid of special breathing equipment.
Limiting the depth of a dive should he encouraged as the maximum depth limit for a diver to use compressed air is 30 to 50 meters.
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Draw the alkyl bromide(s) you would use in a malonic ester synthesis of ethyl 2-methyl-4-pentenoate
The structure of the alkyl bromides used in a malonic ester synthesis of ethyl 2-methyl-4-pentenoate are as drawn in the attached image.
Ethyl 2-methyl-4-pentenoate by Malonic ester synthesis.The malonic ester synthesis is a chemical reaction characterized by the alkylation of diethyl malonate or a similar ester of malonic acid at the carbon alpha (directly adjacent) to both carbonyl groups, and subsequently converted to a substituted acetic acid.
Hence, it follows from the structure of Ethyl 2-methyl-4-pentenoate that the alkyl bromides used are Ethyl bromide and methyl bromide.
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The structure of alkyl bromide that would be used in a malonic ester synthesis of ethyl 2-methyl-4-pentenoate are ethyl bromide and methyl bromide.
What is alkyl bromide?
When halogens such as Br, Cl, I, attched to the sp3 carbon atom of alkyl group, they called alkyl halides.
Here, bromide is attached to an alkyl group.
Ethyl bromide and methyl bromide are the alkyl halides used in synthesis of ethyl 2-methyl-4-pentenoate
Thus, ethyl bromide and methyl bromide are the alkyl bromides.
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For many Arrhenius acid base reactions (e.g., NaOH HCl, or KOH HNO3) the enthalpy change is the same regardless of which acid and which base are used. Why do you think this is so
Answer:
that's because
Explanation:
as far as my knowledge is concerned
HCl(g) + H2O ⇄ H3O+ (aq) + Cl– (aq)
or, more simply (and truer to the original theory):
HCl(g) ⇄ H+ (aq) + Cl– (aq) or HCl(aq)
Convert −55 ◦C to Kelvin
Answer:
-459.67 good luck and hope you pass
why is solar energy a viable alternative energy resource?
Solar energy is a viable alternative energy resource due to its high usage application.
Why is solar energy a viable alternative energy resource?The solar energy is considered as a viable alternative energy resource because this energy can used in the form of electricity for operating all electrical devices present in our homes.
So we can conclude that solar energy is a viable alternative energy resource due to its high usage application.
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Answer:
It has an endless supply is the answer.
2CuCl2 + 4KI → 2CuI + 4KCl + I2
a. When 0.64 grams of CuCl2 reacts with 0.78 grams of KI, how many grams of I2 are formed?
b. What is the limiting reactant?
PLEASE I NEED HELP
What happens to the sunlight when it reaches the Earth's surface?
O
All of the sunlight is reflected from the Earth's surface and radiated
back into space
O
Some of the sunlight is captured as heat on Earth, and some of it is
radiated back to space.
O
All of the sunlight is absorbed by the Earth's surface
Answer:
the second one
Explanation:
Scientific laws commonly answer which questions about the world?
1. Why?
2. How?
3. How many?
4. What?
Answer:
How
Explanation: In science a person has to be curious on how things work. Key word how. Why makes sense but how is the better answer. How many is a specific question. But it doesn't involve the whole spectrum of science. What also doesn't make sense.
A scientific law is a proposition that states what consistently takes place under specific circumstances. The law of conservation of mass and the law of conservation of energy are two other examples of physical science laws. The correct option is 2.
A scientific law only describes an occurrence in the natural world; it makes no attempt to explain how it happens. It is only the outcome of several observations and is supported by empirical evidence.
The definition of a naturally occurring phenomenon in the world is scientific law. It clarifies how something occurs. Equations or formulas in mathematics are used to express laws.
Thus the correct option is 2.
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1. How many moles are in 15.5 g of SO2
2. Find the mass of 1.50 mol C3H8?
3. How many moles is 1.50 x 1023 molecules of NH3 ?
4. Convert 2.50 x 1025 formula units of NaCl into grams.
5. Convert 3.60 mol CO2 into molecules
1. The number of mole in 15.5 g of SO₂ is 0.242 mole
2. The mass of 1.50 mole of C₃H₈ is 66 g
3. The number of mole of NH₃ that contains 1.5×10²³ molecules is 0.249 moles
4. The mass of NaCl that contains 2.5×10²⁵ formula units is 2429.4 g
5. The number of molecules present in 3.6 moles of CO₂ is 2.167×10²⁴ molecules
1. How to determine the mole of SO₂Mass of SO₂ = 15.5 gMolar mass of SO₂ = 32 + (2×16) = 64 g/mol Mole of SO₂ =?Mole = mass / molar mass
Mole of SO₂ = 15.5 / 64
Mole of SO₂ = 0.242 mole
2. How to determine the mass of C₃H₈Mole of C₃H₈ = 1.5 moleMolar mass of C₃H₈ = 44 g/mol Mass of C₃H₈ =?Mass = mole × molar mass
Mass of C₃H₈ = 1.5 × 44
Mass of C₃H₈ = 66 g
3. How to determine the mole of NH₃From Avogadro's hypothesis,
6.02×10²³ molecules = 1 mole of NH₃
Therefore,
1.5×10²³ molecules = 1.5×10²³ / 6.02×10²³
1.5×10²³ molecules = 0.249 mole of NH₃
4. How to determine the mass of NaCl6.02×10²³ units = 58.5 g of NaCl
Therefore,
2.5×10²⁵ units = (2.5×10²⁵ × 58.5) / 6.02×10²³
2.5×10²⁵ units = 2429.4 g of NaCl
5. How to determine the number of molecules1 mole of CO₂ = 6.02×10²³ molecules
Therefore,
3.6 moles of CO₂ = 3.6 × 6.02×10²³
3.6 moles of CO₂ = 2.167×10²⁴ molecules
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Assign an oxidation number to each element in the reaction. co(g) 2h2(g) → ch3oh(g) in co, the oxidation number of c is , and that of o is . in h2, the oxidation number of h is . in ch3oh, the oxidation number of c is , that of o is , and that of h is .
The oxidation state is the number of electrons gained and donated. The oxidation state of C is +2, O is -2, H is 0, and in methanol, C is +1, H is +1, and O is -2.
What is the oxidation number?The oxidation number denotes the number of electrons donated and gained after the bond formation. In general, the oxidation state of free elements is zero, and of hydrogen when the bond to non-metal is +1 and with metals is -1.
The chemical reaction is given as,
[tex]\rm CO + 2H_{2} \rightarrow CH_{3}OH[/tex]
Here,
The oxidation number of carbon in carbon monoxide will be +2, and oxygen will be -2.
The oxidation number of hydrogen in dihydrogen will be zero, and in methanol, the oxidation number of carbon will be +1, hydrogen will be +1 and oxygen will be -2.
Therefore, the oxidation number of oxygen is -2 most of the time.
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What is the coefficient of the permanganate ion when the following equation is balanced? mno4- br- → mn2 br2 (acidic solution)
In acidic solition, the coefficient of permanganate ion in the balanced redox equation is 2.
How can a redox equation be balanced?A redox equation showing a reduction and an oxidation reaction occurring simultaneously.
To balance redox equations, the atoms reacting as well as the electrons transferred are balanced.
In the reaction of permanganate ion and bromide ion in acidic solution, the balanced redox equation is given as follows:
2 MnO4- + 10Br- + 16 H+ → 2 Mn2+ 5 Br2 + 8 H2OTherefore, the coefficient of permanganate ion in the balanced redox equation is 2.
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The coefficient of the permanganate ion of the MNO₄ - Br- → MN₂ + Br₂ is 2.
What is a redox reaction?A redox equation depicting a simultaneous reduction and oxidation reaction.
The atoms reacting as well as the electrons transferred must be balanced to balance redox equations.
The balanced redox equation for the reaction of permanganate ion and bromide ion in acidic solution is:
[tex]\rm 2 MnO_4- + 10Br^- + 16 H^+ \rightarrow2 Mn_2+ 5 Br_2 + 8 H_2O[/tex]
Thus, the coefficient of the permanganate ion of the MNO₄ - Br- → MN₂ + Br₂ is 2.
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UHHH HELP I STUCK IN THIS ONE
Answer:
I believe it's B oxygen
Explanation:
Answer:
D, carbon dioxide.
Explanation:
In order to survive, animals need oxygen, food, and shelter.
PLEASE HURRY THIS IS DUE IN 4 MINUTES!!! 3. In the understory, all of the following are true except
A. The understory has a hot, humid environment.
B. Leaves are bigger in the understory than the other layers because not much sunlight reaches this area.
C. Jaguars and leopards live in the understory.
D. Insects, bees, ants, and beetles live in the understory.
Answer:
WHERES THE UNDER STORY! POST IT QUICK AND ILL HELP
Explanation:
___________ in the stomach are responsible for the mechanical digestion that takes place there.
what are 2 of the characteristics of temporary physical change
Answer:
Temporary in nature.
No new substance is formed.
Explanation:
Temporary in nature: Does not affect the internal structure of a substance, only the molecules are rearranged.
No new substance is formed: Most of the physical changes are reversible. We can obtain the substance back even after the change.
hope this helps
have an awesome day -TJ
Answer:
Doesnot affect the internal structure of the substance.no new substance is formed.temporary in nature...fast please 20 points
Answer:
Horse SS and Horse Ss
Explanation:
The horse look the same except for Horse ss
4. when cu(oh), is heated, it decomposes to black cuo and h,o. consider, how
many grams of cuo will be formed from the decomposition of 6.59 g of cu(oh)?
if only 5.17 g of cuo are produced instead, what is the percent yield?
The percent yield of CuO is 96%. The percentage yield shows the extent to which reactants are converted to products.
What is percent yield?The percent yield is the actual yield divided by the theroretical yield multiplied by 100.
Now we have the equation;
2Cu(OH)2 → 2CuO + 2H2O
Number of moles of Cu(OH)2 = 6.59 g/98 g/mol = 0.067 moles
Since 2 mole of Cu(OH)2 yeilds 2 moles of CuO
0.067 moles alos yields 0.067 moles of CuO
Mass of CuO = 80 g/mol * 0.067 moles of CuO = 5.36 g
Hence, percent yield = 5.17 g/5.36 g * 100 = 96%
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Balanced equation for formation of potassium suberate from cyclooctene
The balanced equations for the formation of potassium suberate from cyclooctene are;
3KMnO4 + 3C8H18 + 4H2O --> 3C8H17(OH)2 + 2MnO2 + 2KOH and
3C8H14(OH)2 + 6KMnO4 ----> 3KCOO(CH2)6 COOK + 6MnO2 + 6H20
What is potassium suberate ?
The compound potassium suberate is obtained from cyclooctene. The first step in the process is the oxidation of cyclooctene using potassium permanganate as follows;
3KMnO4 + 3C8H18 + 4H2O --> 3C8H17(OH)2 + 2MnO2 + 2KOH
This is followed by the production of potassium suberate from the reaction equation;
3C8H14(OH)2 + 6KMnO4 ----> 3KCOO(CH2)6 COOK + 6MnO2 + 6H20
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Balanced chemical equation for the formation of potassium suberate from the cyclooctene is 3KMnO₄+3C₈H₁₈+4H₂O→3C₈H₁₇(OH)₂+2MnO₂+2KOH &
3C₈H₁₄(OH)₂+6KMnO₄→3KCOO(CH₂)₆COOK+6MnO₂+6H₂O
What is balanced equation?Those equation in which number of each entities present on both sids of the given chemical equation is same is known as balanced equation.
Formation of potassium suberate from the cyclooctene will be complete in following two steps:
(1). In first step oxidation of cyclooctene is done by using potassium permanganate.
3KMnO₄ + 3C₈H₁₈ + 4H₂O → 3C₈H₁₇(OH)₂ + 2MnO₂ + 2KOH
(2). In the second step final product is obtained as a result of the oxidation as.
3C₈H₁₄(OH)₂ + 6KMnO₄ → 3KCOO(CH₂)₆COOK + 6MnO₂ + 6H₂O
Hence the balanced chemical reaction for the formation of potassium suberate is discussed above.
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