The pH refers to the negative logarithm of the hydrogen ion concentration of a solution.
What is pH?The term pH refers to the negative logarithm of the hydrogen ion concentration of a solution. Let us now solve each question.
a) Since pH = 2.90
[H^+] = Antilog(-2.90) = 1.26 * 10^-3 M
[OH^-] = 1 * 10^-14/ 1.26 * 10^-3 = 7.9 * 10^-12 M
pOH = 14 - 2.90 = 11.1
b) Since pH = 3. 86
[H^+] = Antilog(-3.86) = 1.38 * 10^-4 M
[OH^-] = 1 * 10^-14/ 1.38 * 10^-4 = 7.2 * 10^-11 M
pOH = 14 - 3.86 = 10.14
c)Since pH = 10.81
[H^+] = Antilog(-10.81) = 1.55 * 10^-11 M
[OH^-] = 1 * 10^-14/ 1.55 * 10^-11 = 6.5 * 10^-4 M
pOH = 14 - 10.81 = 3.19
d) Since pH = 4.11
[H^+] = Antilog(-4.11) = 7.8 * 10^-5 M
[OH^-] = 1 * 10^-14/7.8 * 10^-5 = 1.3 * 10^-10M
pOH = 14 - 4.11 = 9.89
e) Since pH = 11.61
[H^+] = Antilog(-11.61) =2.45 * 10^-12 M
[OH^-] = 1 * 10^-14/2.45 * 10^-12 = 4.1 * 10^-3 M
pOH = 14 - 11.61 = 2.39
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In a thermonuclear device, the volume is 0.05L of gas and a pressure
of 4.0x106 atm. When the bomb goes off, it relases a gas into the
atmosphere at 1.0 atm, what is the volume of the gas after the
explosion?
Answer:
2 x 10^5 liters
Explanation:
P1V1 = P2 V2
P1V1 / P2 = V2 = .05 *4 x 10^6 / 1 = .2 x 10^6 liters
What will be the ratio of the mean free path of the air molecules at 80 °c to their mean free path at stp?.
Answer:
1.00
Explanation:
I honestly have no idea. I found this online and apparently it was correct. I thought at first I would use d = RT/(Nₐ * P *π (2r)². Since all values besides T are constant, I thought the ratio would just be (273+80)/273 since 273 is standard temperature in Kelvin. However, I think the answer is 1.00 since the pressure would also increase since it is a rigid container, effectively cancelling out the increase in temperature.
The ratio of the mean free path of air molecules at 80 °C to their mean free path at STP is approximately 0.934.
What is mean free path?The mean free path (MFP) of gas molecules is the average distance they travel between collisions with other molecules. It depends on the temperature, pressure, and molecular size of the gas. The MFP of air molecules at standard temperature and pressure (STP) is about 68 nanometers.
To find the ratio of the mean free path of air molecules at 80 °C to their mean free path at STP, we need to use the following formula:
Ratio = (MFP at 80 °C) / (MFP at STP)
The MFP at 80 °C can be calculated using the kinetic theory of gases, which states that:
MFP = (k × T) / (sqrt(2) × pi × d² × P)
where k is Boltzmann's constant, T is the temperature in Kelvin, d is the molecular diameter, and P is the pressure.
For air molecules, d is about 0.364 nanometers. At 80 °C (353 K), the pressure of air is about 101.3 kPa. Plugging these values into the formula, we get:
MFP at 80 °C = (1.38 × 10⁻²³ J/K ×353 K) / (sqrt(2) × 3.14 ×(0.364 × 10⁻⁹m)² ×101.3 × 10³ Pa)
MFP at 80 °C = 63.5 nanometers
Now we can calculate the ratio:
ratio = (MFP at 80 °C) / (MFP at STP)
ratio = 63.5 nm / 68 nm
ratio ≈ 0.934
Therefore, the ratio of the mean free path of air molecules at 80 °C to their mean free path at STP is approximately 0.934.
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What is oxidized and what is reduced in this reaction? cu(s) 2agno3(aq) → cu(no3)2(aq) 2ag(s) cu is reduced and ag is oxidized. ag is reduced and cu is oxidized. no3 is oxidized and cu is reduced. ag is oxidized and no3 is reduced.
From the reaction equation, Cu is oxidized in the reaction while Ag is reduced.
What is a redox reaction?The term redox reaction has to do with a reaction in which a specie is oxidized and another is reduced.
Here the reaction equation is; Cu(s) + 2AgNO3(aq) → Cu(NO3)2(aq) 2Ag(s) Cu. We can see that Cu is oxidized in the reaction while Ag is reduced.
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Answer:
this is your sign to take a small break and go drink some water
Explanation:
edge 2022
How many molecules are there in 11.00 moles of carbon dioxide, CO2?
Answer:
Moles= 11/44 = 0.25 molesof CO2. Click to see full answer Considering this, how many moles of carbon are in 1 mole of co2? A mole of CO2molecules (we usually just say “a mole of CO2”) has one moleof carbonatoms and two molesof oxygen atoms.
Exxplanation:
When warm air is forced upward
along a cold front, what might
happen?
A. A thunderstorm can form.
B. A hurricane can form.
C. A dry spell occurs.
D. Clear sky appears.
Answer:
A. A thunderstorm can form.
Explanation:
When it meets warmer air a cold front forms and clouds will appear as the warm air rises and then cools. This may lead to heavy rain along the cold front.
Given that E
o
= 0. 52 V for the reduction Cu+(aq) + e− → Cu(s), calculate E
o
, ΔG
o
, and K for the following reaction at 25°C:
2Cu+(aq) ⇌ Cu2+(aq) + Cu(s)
The equilibrium constant of the reaction is 1.21 * 10^6 while the change in free energy is -34.7 kJ.
What is equilirium constant?The equilibrium constant shows the extent of conversion of reactants to products.
Now we know from the Nernst equation that;
Ecell = E°cell - 0.0592/n logQ
E°cell = 0.52−0.16=0.36 V
Since Ecell = 0 V at equilibrium,
0 = 0.36 - 0.0592/1 log K
0.36 = 0.0592/1 log K
log K = 0.36/ 0.0592
K = antiog (0.36/ 0.0592)
K = 1.21 * 10^6
ΔG = -RT lnK
ΔG =-(8.314 * 298 * ln1.21 * 10^6)
ΔG =-34.7 kJ
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i. TRUE OR FALSE STATEMENTS
state whether the following statements are true or false and correct the false statements
1. Atoms of all elements follow octate rule.
2. All the electrons in atoms are termed as valance electron.
3. The ionic bond is not-directional.
4. Ionic compound exist in crystalline form.
5. Covalent compounds have low melting points.
6. All covalent compounds exist as giant aggregates.
7. Covalent bond is formed due to mutual sharing of electrons.
8. Covalent compounds are good conductors of electricity.
Answer:
a)true. b)true c)false d)true e)false f)false g)true h)true
Some calcifiers can use bicarbonate (HCO3-) to make their shells. How will they be affected by the decrease in pH
The removal of this ion from water by the calcifiers will definitely decrease the pH of water.
What is the bicarbonate ion?The bicarbonate ion is the ion that is designated as HCO3-. We must notice that this ion is present in abundant amounts in the sea. This amount definitely make the sea slightly alkaline.
Now we must note that the removal of this ion from water by the calcifiers that require it to make their shell will definitely decrease the pH of water.
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Determine from the balanced chemical reaction if
the derived mole ratio is correct or incorrect.
2 FeBr3 + 3Na2S → Fe2S3 + 6NaBr
1 moles NaBr
1 moles Nas
Answer:
Explanation:
It's not 1:1 as the ratio implies
There's a 6 in front of the NaBr
There's a 3 in front of the Na2S
Arguement
The ratio is (6 NaBr // 3 Na2S}
Answer
The ratio is {2 NaBr:: 1 Na2S}
Consider the chemical equation. 2nbr3 3naoh right arrow. n2 3nabr 3hobr if there are 40 mol of nbr3 and 48 mol of naoh, what is the excess reactant? n2 nbr3 naoh hobr
Following the equation and the stoichiometry of the reaction, excess reactant.
What is excess reactant?The excess reactant has to do with that reactant that is present in more amount than is required in the reaction.
In this case, we have the reaction; 2NBr3 + 3NaOH ---> N2 + 3NaBr + 3HOBr.
If 2 moles of NBr3 reacts with 3 moles of NaOH
x moles of NBr3 reacts with 48 moles of NaOH
x = 32 moles
Hence, NBr3 is the excess reactant.
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What is the molar mass of Ca(NO3)2?
102. 2 g/mol
134. 1 g/mol
164. 1 g/mol
204. 2 g/mol
Answer:
The answer is 164.1 g/mol
Explanation:
Please Help.
If 40.0 grams of HCI were dissolved in enough water to make a solution with a total volume of 3.0 liters, what would be the molarity of the solution?
Answer:
About 0.37 M.
Explanation:
Recall that molarity is defined by moles of solute over total liters of solution:
[tex]\displaystyle \text{Molarity} = \frac{\text{ mols solute}}{\text{ L soln.}}[/tex]
Determine the amount of moles of HCl in 40.0 grams. The molecular weight of HCl is 36.46 g/mol:
[tex]\displaystyle 40.0\text{ g HCl} \cdot \frac{1\text{ mol HCl}}{36.46\text{ g HCl}} = 1.10\text{ mol HCl}[/tex]
Therefore, the molarity of the 3.0 L solution is:
[tex]\displaystyle\text{Molarity} = \frac{1.10\text{ mol}}{3.0\text{ L}} =0.37\text{ M}[/tex]
In conclusion, the molarity of the solution is about 0.37 M.
Where do you all of the extra "stuff" in your bodies came from as you were growing ?
Answer:
from food ,cells grow ,tissue gro,organs grow body systems grow.......
Can someone please help me? :(
Answer:
Explanation:
I think the answer is Heart & stomach, but is this really a chemistry question? or Biology? :D
Answer:
A: heart
Explanation:
A muscle cell is also known as a myocyte when referring to either a cardiac muscle cell (cardiomyocyte), or a smooth muscle cell as these are both small cells.
Is water solvent or solute
Answer:
Water is a solvent.
Explanation:
What is solvent? Solvent is substance, ordinarily a liquid, in which other materials dissolve to form a solution.
If I have 22,9 moles of a gas at a pressure of 12.4 atm and a volume of 24 liters, what is the temperature?
Answer:
160 K, using 2 SF,
Explanation:
Ideal Gas law, rearrange to solve for T (K), answer about 158.3 round to 2SF
PV = nRT
what are three ways of measuring the amount of substance?
Answer:
Measure its mass
Measure its volume
Measure its number of moles
Explanation:
-
1. N2 + 3H2 → 2NH3
If you form 5.24 moles of NH3 from the above reaction, how many moles of N2 were
present at the start of the reaction?
Answer: 2.62 moles
Explanation:
For every 2 moles of ammonia that are produced, 1 mole of nitrogen is consumed.
This means that if 5.24 moles of ammonia are produced, 5.24/2=2.62 moles of nitrogen are consumed.
a liquid has a low boiling point and is a poor conductor of electricity. The liquid could be which of the following? select all that apply
a. H2O
b. CaCl2
c. CH4
d. FePO4
The liquid which has a low boiling point and is a poor conductor of electricity is Methane (CH4).
What is covalent Compounds?Covalent Compounds are compounds with low boiling point and are poor conductors of heat and electricity. Covalent compounds have strong intra-molecular bonds. This is because the atoms within the covalent molecules are very tightly held together.
Methane (CH4) is a liquid that has a low boiling point and is a poor conductor of electricity.
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what is the industrial application of nitrogen monoxide
Answer:
it can be in the production of nitric acid
Answer:
Explanation:
Nitrogen oxides are used in the production of nitric acid, lacquers, dyes, and other chemicals. Nitrogen oxides are also used in rocket fuels, nitration of organic chemicals, and the manufacture of explosives.
What splits into carbon and oxygen atoms
the periodic table has 18 groups and 7
An isotope of copper, on bombardment with protons, undergoes a nuclear reaction yielding element X as shown below. The group number of element X is: 2963Cu+11H 601n+α+211H+X.
Which term describes this change?
deposition
evaporation
melting
sublimation
Hi! I'm hoping someone can help me with this please thank you XD
The volume of a gas is 204mL when the pressure is 925kPa. At constant temperature, what's the final pressure if the volume increases to 306ml
Answer:
I don't know that anwser sorry
Which term describes this reaction? upper c upper h subscript 3 upper b r (a q) plus upper o upper h superscript minus (a q) right arrow upper c upper h subscript 3 upper o upper h (a q) plus upper b r superscript minus (a q). addition condensation elimination substitution
The reaction is a substitution reaction since bromide ion was replaced by hydroxide ion.
What is a chemical reaction?A chemical reaction is a change which results in a the permanent rearrangements of the atoms and constituents of a substance such that new substances are formed.
The given reaction is a as follows:
[tex]CH_3Br (aq) + OH^{-} (aq) \rightarrow CH_3OH (aq) + Br^{-} (aq) \\ [/tex]
Bromide ion was replaced by hydroxide ion.
Therefore, the reaction is a substitution reaction.
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Answer: D-substitution
Other person is right its
Explanation:
i have a question on y=mx+b which is the y?
Answer:
the b is the y-intercept of the line :D
Explain why the addition of a catalyst can make a reaction occur that doesn't normally occur at room temperature even when AG<0.
A catalyst can cause a reaction to occur that does not normally happen at room temperature by reducing the activation energy needed to undergo the reaction.
What is a catalyst?Catalysts are substances, often enzymes, used to speed up or commence a chemical reaction. They do this by reducing the necessary energy amount needed to begin the reaction, known as activation energy, or simply by changing the way in which the reaction takes place, which can allow for a reaction to take place even at room temperature when it would otherwise not occur.
Therefore, we can confirm that a catalyst can cause a reaction to occur that does not normally happen at room temperature by reducing the activation energy needed to undergo the reaction.
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Would a precipitate form if a solution of calcium acetate were mixed with a solution of sodium phosphate
A mixture of calcium acetate and sodium phosphate would produce [tex]Ca_3(PO_4)_2[/tex] as a precipitate.
Precipitation reactionPrecipitates are insoluble salt formed from the reaction of two soluble salts.
The equation of the reaction between calcium acetate and sodium phosphate is represented by the equation below:
[tex]3Ca(C_2H_3O_2)_2 + 2Na_3PO_4 --- > Ca_3(PO_4)_2 + 6NaC_2H_3O_2[/tex]
The [tex]Ca_3(PO_4)_2[/tex] produced in the reaction is an insoluble salt and, hence, a precipitate.
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Compare and contrast conduction, convection, and
radiation as part of heat energy
Answer:
In conduction, heat transfer takes place between objects by direct contact. In convection, the heat transfer takes within the fluid. In radiation, heat transfer occurs through electromagnetic waves without involving particles. The heat transfer takes place due to the difference in temperature.
I need helpppppppppp, please. What type of radioactive elements does Seabrook Station, New Hampshire's have?
Answer:
NRC: Seabrook nuke plant ran safely in 2020, concrete degradation being monitored. SEABROOK — According to federal experts, annual inspections throughout 2020 show NextEra Energy Seabrook's nuclear power plant again ran safely over the past year.
Explanation: