Answers
Answer:
I don't know the help you are talking about.
Related Questions
What is the purpose of adding base in the aldol condensation reaction? choose the best answer.
Answers
Base is used in aldol condensation reaction
because it is an organic reaction to form enolate ion, the OH bond present in base help to remove Acidic hydrogen of enolate ion.
Please indicate which of the compounds will yield postive results for the permanganate, ninhydrin, and ceric ammonium nitrate tests by placing them in the appropriate boxes.
Answers
The compounds will yield Positive results for the permanganate, ninhydrin, and ceric ammonium nitrate tests are
permanganate test= ethene,
ninhydrin=aspasyic acid Phenylalanine
ceric ammonium nitrate test= methanol
What is a compound?Generally, A compound is simply defined as a substance made up of two or more different chemical elements held together by chemical bonds that are difficult to break.
In conclusion, For the permanganate test= ethene,
ninhydrin=aspasyic acid Phenylalanine
ceric ammonium nitrate test= methanol
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A sample has 0.2 moles of salt dissolved in 2 L of solution. What is the molarity
Don't put no random answer if you don't know it don't answer it please... TY :)
Answers
Molarity is the ratio of the moles and the volume of the solution in liters. The molarity of the 0.2 mole salt is 0.1 M.
What is molarity?The molarity of the solution is the molar concentration of the moles of the solute dissolved in a liter of solution. It is given as,
[tex]\rm Molarity (M) = \rm \dfrac{\text{moles of solute (n)}}{\text{volume (V) in liters}}[/tex]
Given,
Moles (n) of the salt = 0.2 mol
The volume of the solution (V) = 2 L
Substituting values in the above equation:
[tex]\begin{aligned} \rm M &= \dfrac{0.2}{2}\\\\&= 0.1 \;\rm M\end{aligned}[/tex]
Therefore, 0.1 M is the molarity of the sample.
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What is the mass of 3.01 x 10^23 atoms of copper
Answers
Answer: There are 31.8 grams of copper.
Explanation:
WILL GIVE BRAINLIEST
Mussels need both Ca2+ and CO32- to make their shells. The data showed that the ocean Ca2+ has not changed, so Ca2+ is not the problem.
To determine the CO32- concentration in the ocean, we can use the DIC measurement and the ocean’s pH.
Use the reaction equation above to answer the question on the relationship between pH and CO32- concentration.
Would a decrease in pH mean an increase or decrease in CO32- concentration?
Answers
Answer: Decrease
"Carbon dioxide reacts with seawater to form carbonic acid, which releases hydrogen ions, reducing pH"
Sourced from https://yaleclimateconnections.org/2008/06/covering-ocean-acidification-chemistry-and-considerations/
So basically the ocean is absorbing the CO32- and that lowers the pH as well lowers the amount of CO32- readily available.
This is all I could find on this subject though ;'(
what is the least measurement of black hole,
Answers
Answer:
Here is the correct answerblack hole in ourter space for the first time the scientific research
and development of the following layers lethargic
Explanation:
STUDY CORRECTION.
Please answer this question for me
Answers
Answer:
True.
Explanation:
Ternary acids end in -ic if the polyatomic anion ends in -ate.
True
Explanation:
It is clearly given in the hint
The phosphorus atom in pcl3 would be expected to have a:.
Answers
The phosphorus atom in Phosphorus trichloride (PCl₃) would be expected to have a partial positive charge.
What is a partial positive charge?A molecule has a partial positive charge when it presents differences in electric charges along the molecule.
A molecule that has a partial positive charge is said to be polar because can generate polar bonds.
Moreover, phosphorus trichloride (PCl₃) is a molecule that forms a colorless substance used in the inorganic chemistry industry.
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A gas sample has a volume of 30.0 mL at a pressure of 1.53 atm. If the volume increases to 50.1 mL and the temperature remains constant, the new pressure in atms will be
Answers
At constant temperature, if the volume of the sample of gas increases to the given value, the pressure decreases to 0.92atm.
Boyle's lawBoyle's law simply states that "the volume of any given quantity of gas is inversely proportional to its pressure as long as temperature remains constant.
Boyle's law is expressed as;
P₁V₁ = P₂V₂
Where P₁ is Initial Pressure, V₁ is Initial volume, P₂ is Final Pressure and V₂ is Final volume.
Given the data in the question question;
Initial volume of the gas V₁ = 30.0mL = 0.03LInitial pressure of the gas P₁ = 1.53atmFinal volume of the gas V₂ = 50.1mL = 0.0501LFinal pressure of the gas P₂ = ?We substitute our given values into the expression above to determine the new pressure.
P₁V₁ = P₂V₂
P₂ = P₁V₁ / V₂
P₂ = ( 1.53atm × 0.03L ) / 0.0501L
P₂ = 0.0459Latm / 0.0501L
P₂ = 0.92atm
Therefore, at constant temperature, if the volume of the sample of gas increases to the given value, the pressure decreases to 0.92atm.
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Consider an atom having four distinct energy levels. If an electron is able to make transitions between any two levels, how many different wavelengths of radiation could the atom emit?.
Answers
Energy levels are the electron shells where electrons are found at a fixed distance from the nucleus of the atom. The atom could emit 6 different wavelengths.
What is wavelength?
A wavelength is a distance between the adjacent crests in wave signals propagated in a system. Wavelength [tex](\rm \lambda )[/tex] is in inverse relation to the frequency of the wave.
When an electron jumps from energy level 1 to 2, 1 to 3, and 1 to 4 one wavelength each is present. Hence, making the total wavelength to be 3, in transition from the first energy level.
Similarly, from energy levels, 2 to 3 and 2 to 4, a total of 2 wavelengths, and from energy levels 3 to 4 one wavelength is produced.
So the total different wavelengths of the radiation that can be emitted will be 3 + 2 + 1 = 6.
Therefore, 6 different wavelengths of radiation will be emitted by the atom.
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How many moles of water are produced from the following reaction, when 275 kJ of energy is given off?
4 NH3 + 3 O2 → 2 N2 + 6 H2O ΔH = -1530 kJ
Answers
The moles of water are produced from the given reaction, when 275 kJ of energy is given off is 1.08 moles.
How do we calculate moles of water?The mole (symbol mol) is the SI base unit of material quantity. The amount of substance in an object or sample is a measure of how many elementary entities of a certain substance are present.
Given chemical reaction is:
4NH₃ + 3O₂ → 2N₂ + 6H₂O
From the stoichiometry of the reaction it is clear that 6 moles of water molecule is produced.
Actual moles will be calculated by using the enthalpy and energy value as:
Actual moles of H₂O = 275kJ × (6 mol H₂O)/1530kJ) = 1.08 moles.
Hence required moles of H₂O is 1.08 moles.
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What would the concentration of an NaOH solution be if 25 moles were used and 50 L were used?
0. 5 M
0. 5 M
2 M
, 2 M
1250 M
1250 M
25 M
Answers
Answer:
0.5 M
Explanation:
To find the concentration, you take the moles and divide that by the liters;
[tex]\frac{moles}{liters} =\frac{25 moles}{50 L} =0.5M[/tex]
I hope this helps!
Please Please Please help + show the work please! :)
Find the number of grams 9.30 x 10^-3 mole of SmO
Answers
So, there are about (9.30 * 10^-3)(160.36)=1.49 grams
Molar mass of SmO or sodium methylate is 160g/mol
Now
No of moles =Given mass /Molar massGiven mass
No of moles ×Molar mass9.3×10^{-3}×1601.488gA 1 liter solution was diluted to a molarity of 2 M by bringing the volume up to 4 liters. What was the initial molarity of the solution?
Answers
Answer:
8.0 mol/L
Explanation:
To do this problem you need to use C₁V₁=C₂V₂. C=concentration and V=volume. (Note: you dont want to use M₁V₁=M₂V₂ because this is measuring mass not concentration).
So, V₁= 1.0L
C₂=2 Mol/L
V₂= 4 L
C₁ is unknown.
you would plug this equation in like this:
(C₁)(1.0 L)=(2.0 Mol/L)(4.0L).
Do algebra to get C₁ alone.
C₁=[tex]\frac{(2.0 mol/L)(4.0L)}{1.0L} =8.0 mol/L[/tex]
The liters cancel out and you are left with mol/L or M
I hope this helps! good luck :)
PLEASE HELP ASAP
More info on picture.
This relationship is known as Graham's Law of Effusion. How many times heavier is the heavy gas compared to the light gas?
(In 3a and 3b the heavy gas took 118 seconds while the light gas took 41 seconds)
Answers
Answer:
A box of ideal gas has consists of light particles and heavy particles (the heavy ones have 16 times the mass of the light ones).
After Hunter drank a glass of milk, sugar levels in his blood increased. This stimulated the hormone insulin to be released. Insulin helped the sugar move from his blood into cells, so his blood sugar levels decreased.
Which statement explains what happened next?
Positive feedback caused his pancreas to stop secreting insulin.
Negative feedback caused his pancreas to stop secreting insulin.
Negative feedback caused his pancreas to produce more insulin.
Positive feedback caused his pancreas to produce more insulin.
Answers
Answer:
Negative feedback caused his pancreas to stop secreting insulin.
Explanation:
i took the test its correct
If the concentrations of a weak acid and its conjugate base are increased from 0.1 M and 0.05 M, respectively, to 0.2 M and 0.1 M, the solution's buffer capacity will _________.
Answers
If we increase the concentrations of a weak acid and its conjugate base by the amounts shown, the buffer capacity will remain the same.
What is buffer capacity?The term buffer capacity is generally used to describe how much of the acid or base that can be neutralized by a buffer before there can be a change in the pH.
In this case, if we increase the concentrations of a weak acid and its conjugate base by the amounts shown, the buffer capacity will remain the same.
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1. Given the following reaction, answer the questions that follow:
C3H8+5 02
3 CO₂ + 4H₂O
a) If you begin with 3.5 moles of C3H8 and 6.2 moles of O₂, find the moles of carbon dioxide produced_
b) Find the mass of CO₂ produced using your work in step (a) above.
Answers
Answer:
See below
Explanation:
From the equation you can see 5 mole O2 results in 3 moles CO2
( this is the limiting reagent because C3H8 : O2 is 1:5)
6.2 / 5 * 3 = 3.72 moles CO2 produced
CO2 weighs ~ 44 gm/mole 44 gm/mole * 3.72 mole = 163.68 gm of CO2
Describe the importance of plaster of paris
Answers
Answer:
plaster is important because of the many uses you can make out of plaster
A scuba tank has a pressure of 195 atm at a temperature of 10ºC. The volume of the tank is 350 L. How many moles of air are in the tank?
Answers
Answer:
The answer is 2939 moles.
Explanation:
To obtain the moles from these values you should apply the ideal gas formula because in a scuba tank all gas that you have inside is the air:
PV= nRT. (1)
Thus the moles number, n, is:
n = PV/ RT (2)
Where:
P is pressure: 195 atm;
V is volume: 350 L,
R is gas constant: 0,082 atm×L / mol×K
And T is temperature: 10°C, that must be converted in k, thus:
10°C + 273,15 = 283,15 K
Replacing these values in (2) the moles number, n, is:
2939 moles of air
how many grams of methane will you have from 3 moles of Sodium Acetate
Answers
Answer:
roughly about 246.1?
Explanation:
Which acid/base pair will give an equivalence point that cannot be predicted solely by a general knowledge of acid and base strength
Answers
The acid/base pair that give equivalence point that Cannot be predicted by general knowledge is NaOH and HCI ONH.
What is an Acid and base?An Acid is a substances that is corrosive in nature and turn blue lithmus paper to red which it react with base to produce salt and water.
Acid dissolve metals.
Base is a substance that turn red lihthmus paper to blue and react with acid to produce salt and water.
Therefore, The acid/base pair that give equivalence point that Cannot be predicted by general knowledge is NaOH and HCI ONH.
The question is incomplete as the options were not given. The options were gotten from another website.
Select the correct answer below:
ONaOH and HCI ONH,
HC ONH, and CH, COOH
NaOH and Christmas, COOH
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to show all work and cancel units as necessary.
the equation: 2CH4 + 130₂→ 8CO₂ + 10H₂O
How many moles of Carbon Dioxide can be produced if you begin the reaction with 4
moles of methane (CH4)?
How many moles of water can be produced if you begin the reaction with 4 moles of
methane (CH₂)?
How many moles of Oxygen gas will it take to produce 126 moles of water?
Answers
Answer:
Explanation:
1) For every 2 moles of methane consumed, 8 moles of carbon dioxide are produced. This means that if 4 moles of methane are consumed, the reaction can occur twice, meaning 8(2)=16 moles of carbon dioxide will be produced.
2) For every 2 moles of methane consumed, 10 moles of water are produced. This means that the reaction can occur twice, and hence 10(2)=20 moles of water will be produced.
3) For every 10 moles of water produced, 13 moles of oxygen gas are consumed. This means that if we want 126 moles of water, we need the reaction to occur 12.6 times, and thus 13(12.6)=163.8 moles of oxygen gas will be consumed.
5. How much water would need to be added to 750 mL of a 2.8 M HCl solution to
make a 1.0 M solution?
6. If I add 25 mL of water to 125 mL of a 0.15 M NaOH solution, what will the molarity of the diluted solution be?
7. If I add water to 100 mL of a 0.15 M NaOH solution until the final volume is 150 mL, what will the molarity of the diluted solution be?
8. How much 0.05 M HCl solution can be made by diluting 250 mL of 10 M HCl?
9. I have 345 mL of a 1.5 M NaCl solution. If I boil the water until the volume of the solution is 250 mL, what will the molarity of the solution be?
10.
How much water would I need to add to 500 mL of a 2.4 M KCl solution to make a 1.0 M solution
please help me
Answers
The values of molarity and volumes for the given questions are 2,100 mL, 0.75 M, 0.1 M, 50,000 mL, 2.07 M and 1,200 mL respectively.
What is the relation between the molarity & volume of solution?Relation between the molarity and volume of the solution will be shown by the following equation:
M₁V₁ = M₂V₂, where
M₁ & V₁ is the molarity and volume of one solution whereas M₂ & V₂ are the molarities and volume of the another solution.
Required volume of water needed to add at 750 mL of a 2.8 M HCl solution to make a 1.0 M solution will be calculated by using the above formula:V₂ = (750)(2.8) / (1) = 2,100 mL
Required molarity of diluted solution obtained on adding 25 mL of water to 125 mL of a 0.15 M NaOH solution will be calculated by using the above formula:M₂ = (0.15)(125) / (25) = 0.75 M
Required molarity of diluted solution obtained on adding 100 mL of a 0.15 M NaOH solution until the final volume is 150 mL will be calculated by using the above formula:M₂ = (100)(0.15) / (150) = 0.1 M
Required volume of HCl of 0.05M HCl can be made by diluting 250 mL of 10 M HCl will be calculated by using the above formula:V₂ = (10)(250) / (0.05) = 50,000 mL
Molarity of the resultant solution is:M₂ = (1.5)(345) / (250) = 2.07 M
Required volume of water to add on KCl solution is:V₂ = (2.4)(500) / (1) = 1,200 mL
Hence required values of molarity and volume are 2,100 mL, 0.75 M, 0.1 M, 50,000 mL, 2.07 M and 1,200 mL respectively.
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What is a commission?
A.
taking control of a situation
B.
a military unit
C.
a legal organization
D.
assigned to supervise soldiers
Answers
Answer:
B. a military unit
Explanation:
Under which of the following conditions of temperature and pressure would 1.0 mol of the real gas CO2(g) behave most like an ideal gas?
(1) 100 K and 0.1 atm
(2) 100 K and 10 atm
(3) 500 K and 0.1 atm
(4) 500 K and 10 atm
(5) none of above
Answers
Answer:
c. 800 K, 0.1 atm
Explanation:
Good luck in AP Chem
How many grams of NaCl required to form a 500ml solution with a molarity of 0. 5M , the molar mass of NaCl is 58. 5g/mol?
Answers
Answer:
14.625 gm
Explanation:
(x / 58.5 gm) / (500ml /1000 ml) = .5 x = 14.625 gm
The atomic symbol superscript 206 subscript 82 upper p b. represents lead-206 (pb-206), an isotope that has 82 protons and 124 neutrons. which atomic symbol could represent an isotope that undergoes radioactive decay to produce pb-206? superscript 238 subscript 92 upper u. superscript 222 subscript 87 upper p b superscript 178 subscript 72 upper h f. superscript 192 subscript 77 upper p b.
Answers
Answer: The atomic symbol represent an isotope that undergoes radioactive decay to produce Pb-206 can be, Polonium (Po).
Which two factors must be considered when predicting whether two substances will dissolve in each other?
A. number of bonds and size of the molecules
B. number of bonds and molecular shape
C. type of bonds and size of the molecules
D. type of bonds and molecular shape
Answers
The two factors must be considered when predicting whether two substances will dissolve in each other are type of bonds and size of the molecules are two factors.
What is solubility?Solubility is the ability of solute particles to dissolve in any solvent, and solubility is directly proportional to the dissolving ability of the solute.
Solubility of any substance depends on the type of the bond present in the solute molecule i.e. polar or non polar. And it is also depends on the size of the solute as size defines the surface tenssion of the substance.
Number of bonds and shape of molecules are also define the solubility but not at that extent as their type and shape.Hence type of bonds and size of the molecules are two factors.
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Which molecule is hexanal?
Answers
Answer:is A.
Explanation:Because six carbon straight chain aldehyde it is clear liquid with an atomspheric pressure boiling point of 131 degree Celsius.