Answer:
Calculate the pOH for a solution with a hydroxide ion, (OH-) of concentration of 6.49 X 10-11 M.
Calculate the pH.
Note: the answers should have three significant figures
The pOH is: Blank 1
The pH is: Blank 2
Explanation:
Explain how humans get muscle cramps
Answer:
Humans get muscle cramps when they start sport movemement wih out training and there is a store of calorie and amino acids so when it heated fastly there were some disease like muscle cramps
For the reaction shown, find the limiting reactant for each of the initial quantities of reactants 4Cr + 3o2 -> 2Cr2O3 d)14.8 mol Cr; 10.3 mol O2
Answer: O2
Explanation:
The balanced chemical equation is:
4 Cr + 3 O2 ---> 2 Cr2O3
4 mol of Cr reacts with 3 mol of O2 to form 2 mol of Cr2O3
For 14.8 mol of Cr, 11.1 mol of O2 is required
But we have 10.3 mol of O2
So, O2 is the limiting reagent
What is the total number of atoms contained in 3.63 moles of nickel?
Answer:
Explanation:
1 mole of nickel contains 6.02 * 10^23 atoms
3.63 mols of nickel contain x atoms.
What you have is a proportion. A proportion consists of 2 ratios or 4 parts.
Of the 4 parts, you know three of them. The problem is to solve for the 4th.
1/3.63 = 6.02*10^23 / x Cross multiply
x = 3.63 * 6.02* 10^23 Combine the right.
Answer: x = 2.19*10^24 atoms
What are some other type of chemical reactions? What makes them different?
The more solute is broken down in solution the less conductive the solutions is. True or False
Answer:
False.
Explanation:
If the answer to this question was true, then that would mean that the more the solute is broken down, the less it'll dissolve... and everyone know that this doesn't make sense. I hope I explained this is an easy manner so you could understand! Good luck! :)
The more solute is broken down in solution the more conductive the solutions is and the statement is False.
What effects the conductive nature of a solution?
Conductivity depends upon solvation of ions present in solution. Greater the solvation of ions, lesser is the conductivity.
Solvation is the process in which molecules of a solvent attract the particles of a solute.
The main forces in solvation are ion-dipole and hydrogen bonding attractions.
The more concentrated a solution is, the greater the conductivity measured (if the solute is a conductor in solution). This is because the higher the concentration of the solute, the more ions will be available to carry electric charge.
Therefore, the more solute is broken down in solution the more conductive the solutions is and the statement is False.
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The ground electron configuration of a Tc atom is (Kr) 5s2 4d5. What is the electron configuration of a Tc3 ion
Answer:
2:1 of Tc in the periodic table
Calculate how many grams of oxygen form when 2.72 g of KCIOg reacts completely given the
following equation:
2 KCI03 (s)
- 2 KCI (s) + 302 (g)
1.06g
Please refer to the image attached.
You first find the number of moles (n) for KClO3 as you have been given the mass. So n = mass/Mr gives you the moles that is 0.022 mol
Next you use the ratio 2:3 as per the equation where it's 2KClO3 ---> 3O2 so you just cross multiply and get the moles for oxygen.
Now that you know the number of moles for oxygen, you can use the same moles equation that you used earlier to find the mass. mass=n×Mr and so you get the answer as 1.06g of oxygen.
The ________________and ______________ of magma cause igneous rocks to form.
Answer:
The solidifying/cooling and crystallizing of magma causes igneous rocks to form.
How many moles of PbCl2 are produced
if 14 moles of AICI3 are consumed?
3Pb(NO3)2 + 2AlCl3
>
3PbCl2 + 2A1(NO3)3
Answer:21 moles of PbCl2 formed
how many moles of glucose do I have if I have 26 grams of glucose
Answer:
0.1443194637888042 moles
Explanation:
Hope This Helps
Have A Great Day
~Zero~
what are chemical reaction
Example:-
Burning of waxWe cannot pull back the reaction to get wax back .
Answer:
Explanation:
The permanent change in which a new substance is formed is called a chemical reaction.
For example:
i)Burning of wood
ii)Cooking rice
iii)Forming curd from milk
The burning of wood is a chemical reaction because it is a permanent change and it cannot be reversed. Once it is done, it is over it can't be done again. And in the case of example iii, the milk turns into curd by chemical reaction. A new substance i.e curd is formed from the milk.
Hope you understood!
7.06 equilibrium lab report
Chemical equilibrium is a dynamic equilibrium whereby the forward and backward reactions are occurring at the same rate.
What is chemical equilibrium?Chemical equilibrium refers to a situation in which the forward reactions and the backward reactions in a reversible reaction are occurring at the same same same rate.
Factors that affect equilibrium include:
temperature pressure concentrationFor a closed reaction system in equilibrium, the equilibrium position of the reaction will adjust to nullify any changes imposed on the system.
Therefore, chemical equilibrium is a dynamic equilibrium.
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6. Two flasks at the same temperature are joined by a glass tube with a stopcock. Flask A is a 4.0 L flask containing
N2(e) at 2.0 atm, while flask B is a 10.0 L flask containing CO(g) at 1.4 atm. What is the final pressure in the flasks
after the stopcock is opened?
Hints:
Determine the final volume for the gases leasy!).
.
The final pressure in the flasks (containing N₂ and CO) after the stopcock is opened is 1.57 atm
How to determine the mole in flask AVolume (V) = 4 L Pressure (P) = 2 atm Temperature (T) = STP = 273 KGas constant (R) = 0.0821 atm.L/Kmol Number of mole (n) =?n = PV / RT
n = (2 × 4) / (0.0821 × 273)
n = 0.357 mole
How to determine the mole in flask BVolume (V) = 10 L Pressure (P) = 1.4 atm Temperature (T) = STP = 273 KGas constant (R) = 0.0821 atm.L/Kmol Number of mole (n) =?n = PV / RT
n = (1.4 × 10) / (0.0821 × 273)
n = 0.625 mole
How to determine the final pressure Total volume (V) = 4 + 10 = 14 L Total mole (n) = 0.357 + 0.625 = 0.982 moleTemperature (T) = STP = 273 KGas constant (R) = 0.0821 atm.L/Kmol Pressure (P) =?P = nRT / V
P = (0.982 × 0.0821 × 273) / 14
P = 1.57 atm
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explain how sound is produced and travel from one place to another.
Answer:
vibration of particles...........
If 0.380 mol of barium nitrate is allowed to react with an excess of phosphoric acid, how many moles of barium phosphate could be formed?
Ba (NO3)2+ H3PO4 → Ba3(PO4)2+ HNO3
If 0.380 mol of barium nitrate is allowed to react with an excess of phosphoric acid, 0.127 moles of barium phosphate could be formed.
How to calculate number of moles?The number of moles of a compound can be calculated stoichiometrically as follows:
Based on this question, the following chemical equation is given:
Ba (NO3)2+ H3PO4 → Ba3(PO4)2+ HNO3
The balanced equation is as follows:
3Ba(NO3)2 + 2H3PO4 → Ba3(PO4)2 + 6HNO3
3 moles of barium nitrate produces 1 mole of barium phosphate
Therefore, 0.380 moles of barium nitrate will produce 0.380/3 = 0.127moles of barium phosphate.
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The weak ionization constant (Ka)
for H2CO3 is equal to:
A
B
(H2CO3]
[H+] [HCO3-)
[H+][HCO3-)
[H2CO3]
Carbonic acid is a weak acid. Its weak ionization constant (Ka) is equal to:
Ka = [H⁺] [HCO₃⁻] / [H₂CO₃]
What is a weak acid?A weak acid is an acid that dissociates partially in the water.
The equation for the acid dissociation of carbonic acid is:
H₂CO₃ ⇄ H⁺ + HCO₃⁻
The weak ionization constant (Ka) is the equilibrium constant for this reaction, that is, the product of the concentration of the products divided by the product of the concentrations of the reactants, all of them raised to their stoichiometric coefficients.
Ka = [H⁺] [HCO₃⁻] / [H₂CO₃]
Carbonic acid is a weak acid. Its weak ionization constant (Ka) is equal to:
Ka = [H⁺] [HCO₃⁻] / [H₂CO₃]
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How many orbitals are in Phosphorus
(Squirrels gather and store acorns for the winter, which is an example of a ___________ adaptation.)
A. Mimicry
B. Behavioral
C. Structural
D. Environmental
Answer:
C
Explanation:
A 260.0 −mL buffer solution initially contains 2.5×10−2 M of HCHO2 and 2.5×10−2 M of NaCHO2
What mass of the correct reagent should you add (in grams)?
Express your answer using two significant figures.
The mass of HCHO2 and NaCHO2 to be added to the buffer solution are 0.23g and 0.44g respectively
Data;
Volume of solution = 260mLconc. of HCHO2 = 2.5*10^-2Mconc. of NaCHO2 = 2.5*10^-2MMass of Reagent AddedTo calculate the mass of reagent added, let's start with HCHO2
The mass of HCHO2 to be added is the number of moles of HCHO2 multiplied by it's molar mass.
[tex]260*10^-^3 * 2.5*10^-^2 * 46 = 0.229 = 0.23g[/tex]
The mass of NaCHO2 to be added in the buffer solution is
[tex]260*10^-^3*2.5*10^-^2*68 = 0.442 = 0.44g[/tex]
The mass of HCHO2 and NaCHO2 to be added to the buffer solution are 0.23g and 0.44g respectively
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3. Calculate the mass of NH3 that can be produced from the reaction of 125 g of NCI:
according to the following equation:
NCl3 + 3 H2O → NH3 + 3 HOCI
The mass of NH₃ : = 17.629 g
Further explanation
A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.
Given
125 g NCl₃
Required
The mass of NH₃
Solution
mol NCl₃(molar mass : : 120.5 g/mol)
= 125 g : 120.5 g/mol
= 1.037
From the equation, mol ratio NCl₃ : NH₃ = 1 : 1, so mol NH₃ = 1.037
Mass NH₃(molar mass : 17 g/mol) :
= 1.037 x 17
= 17.629 g
Acid rain can be caused by all of the following except..
Select one:
A. automobile exhaust.
B. coal-burning power plants.
C. earthquakes.
D. volcanic eruptions.
(I’ve come to the conclusion that they all can cause acid rain, so I am at a loss as to which one doesn’t.)
Answer:
Earthquakes
I might be wrong. Hope this helps
Answer:
earthquake
Explanation:
they all can cause house break and people die dangerous
What is the most metallic character with low ionization energies
Answer:
Metals tend to lose electrons in chemical reactions, as indicated by their low ionization energies. Within a compound, metal atoms have relatively low attraction for electrons, as indicated by their low electronegativities.
Criteria and constraints help determine which solutions will be applied when extracting materials from pomace in which way
might a specific criterion be applied to this situation? (1 point)
The use of pomace for pharmaceuticals might be chosen if a food company does not have access to a
production plant for extracting chemicals
The use of pomace for pharmaceuticals might be chosen if minimizing production costs is desired
a
The use of pomace for animal feed might be chosen if a food company does not have access to a
production plant for extracting chemicals
The use of pomace for animal feed might be chosen if minimizing production costs is desired.
Answer:
The use of pomace for animal feed might be chosen if minimizing production costs is desired
Explanation:
i've taken the test
The use of pomace for animal feed might be chosen if minimizing production costs is desired. Therefore, the correct option is option D.
What is pomace?The solid byproduct of pressing grapes, olives, or even other fruits for juice or oil is known as pomace or marc. It includes the fruit's skins, pulp, seeds, or stems. Pomace brandy has traditionally been made from grape pomace. Currently, it is primarily used as fertilizer, animal feed, or to extract bioactive substances like polyphenols.
The Latin word "pomum" is where "pommace" comes from. The phrase "pomace" was first used by the English to describe the byproduct of making cider. Pomace wine, which had an alcohol concentration of three to four percent, was very common during the Middle Ages. The use of pomace for animal feed might be chosen if minimizing production costs is desired.
Therefore, the correct option is option D.
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How many carbon atoms are there in 5 molecules of C6H12O6?
Answer:
6
Explanation:
Glucose has a chemical formula of: C6H12O6 That means glucose is made of 6 carbon atoms, 12 hydrogen atoms and 6 oxygen atoms.
NH4NO3+Zn(OH)2
Balance the equation
Answer:
Balanced equation: Zn (NO 3) 2 + 2 NH 4 OH = 2 NH 4 NO 3 + Zn (OH) 2 Reaction type: double replacement
Explanation:
A solution consists of 35.00 g of CuSO4 dissolved in 250.0 mL of water. The molar mass of Cu is 63.55 g/mol the molar mass of S is 32.07 g/mol, and the molar mass of O is 16.00 g/mol. What is the molarity of the solution?
The molarity of a solution that contains 35.00 g of CuSO4 dissolved in 250.0 mL of water is 0.88M.
How to calculate molarity?The molarity of a solution can be calculated using the following formula:
Molarity = no of moles/volume
According to this question, a solution consists of 35.00 g of CuSO4 dissolved in 250.0 mL of water.
no.of moles of CuSO4 = 35g ÷ 159.6g/mol
no. of moles of CuSO4 = 0.22 moles
Therefore; molarity of CuSO4 solution is calculated as follows:
M = 0.22 ÷ 0.25
M = 0.88M
Therefore, the molarity of a solution that contains 35.00 g of CuSO4 dissolved in 250.0 mL of water is 0.88M.
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1s22s22p63s23p3
what element does this represent
Answer:
Its phosphorus (P)
Explanation:
In writing the electron configuration for Phosphorus the first two electrons will go in the 1s orbital. Since 1s can only hold two electrons the next 2 electrons for Phosphorous go in the 2s orbital. The next six electrons will go in the 2p orbital. The p orbital can hold up to six electrons. We'll put six in the 2p orbital and then put the next two electrons in the 3s. Since the 3s if now full we'll move to the 3p where we'll place the remaining three electrons. Therefore the Phosphorus electron configuration will be 1s22s22p63s23p3.
How many moles of neon gas are there 25.0 L of gas or 5.0°C with a pressure of 89.9 KPa?
Now
[tex]\\ \rm\rightarrowtail PV=nRT[/tex]
[tex]\\ \rm\rightarrowtail n=\dfrac{PV}{RT}[/tex]
[tex]\\ \rm\rightarrowtail n=\dfrac{89.9(25)}{5R}[/tex]
[tex]\\ \rm\rightarrowtail n=89.9(5)/R[/tex]
[tex]\\ \rm\rightarrowtail n=449.5/R mol[/tex]
How should the solute and solvent be mixed in the container?.
Fill to the 250-mL mark with water after mixing a tiny amount of water with the solute to dissolve it.
how many moles of methane are produced when 4.53 mol co2 reacts
Answer:
2.25 moles
Explanation:
thats correct answer
Thank you