The pH of a 0.64 M solution of pyridine (C₅H₅N) is 9.52.
What is pH ?A figure expressing the acidity or alkalinity of a solution on a logarithmic scale on which 7 is neutral, lower values are more acid and higher values more alkaline.
The equation for the protonation of the base pyridine is the following:
C₅H₅N + H₂O ⇄ C₅H₅NH⁺ + OH⁻ (1)
Kb = 1.7 × 10⁻⁹ (Given)
To calculate the pH of the solution we need to use the following equation:
pH + pOH = 14
pH = 14 - pOH
=14 - [-log[OH⁻]]
= 14 + log[OH⁻]
Now, we need to find the concentration of the OH⁻ ions. Since pyridine is a weak base, at the equilibrium we have (eq 1):
C₅H₅N + H₂O ⇄ C₅H₅NH⁺ + OH⁻
0.64 - x x x
After entering the values of [C₅H₅N] = 0.64-x, [C₅H₅NH⁺] = x, and [OH⁻] = x, into equation (2) we can find the concentration of OH⁻:
1.7 × 10⁻⁹ =[C₅H₅NH⁺] [OH⁻] / [C₅H₅N]
= x . x / 0.64-x
1.7 × 10⁻⁹ (0.64-x) - x² = 0
Solving the above quadratic equation for x, we have :
x₁ = -3.32 x 10⁻⁵x₂ = 3.32 x 10⁻⁵Now, We can calculate the pH, after taking the positive value, x₂, (concentrations cannot be negative) and entering into above equation :
pH = 14 + log[OH⁻]
= 14 + log (3.32 x 10⁻⁵)
= 9.52
Therefore, the pH of the solution of pyridine is 9.52.
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How many moles of CH3CH2Br are contained in 422 mL of 0.0950 M CH3CH2Br solution?
Coffe is a solution of organic substance in water
Answer:
Verdadero!
no se en que mas quieres que te ayude? o cual realmente quieres que sea la respuesta?
ZnS (s) + AIP(s) → AI₂S₂(s) + Zn P₂(s)
Answer:
3 ZnS (s) + 2 AIP(s) ---> AI₂S₃(s) + Zn₃P₂(s)
Explanation:
I believe you are asking for this reaction to be balanced. However, after looking more closely, those are not the products that would be created from the reactants. Assuming this is a double-displacement reaction, and taking the most common charges of the ions into consideration, the actual products would be AI₂S₃(s) + Zn₃P₂(s). I apologize if I assumed incorrectly.
For an equation to be balanced, there needs to be the same amount of each element on both sides of the equation.
The unbalanced equation:
ZnS (s) + AIP(s) ---> AI₂S₃(s) + Zn₃P₂(s)
Reactants: 1 zinc, 1 sulfur, 1 aluminum, 1 phosphorus
Products: 3 zinc, 3 sulfur, 2 aluminum, 2 phosphorus
As you can see, there is an unequal amount of each element on the reactants and products side. To balance the equation, coefficients in front of the compound(s) will be necessary.
The balanced equation:
3 ZnS (s) + 2 AIP(s) ---> AI₂S₃(s) + Zn₃P₂(s)
Reactants: 3 zinc, 3 sulfur, 2 aluminum, 2 phosphorus
Products: 3 zinc, 3 sulfur, 2 aluminum, 2 phosphorus
CH3CH₂OH + 0₂ → CO₂ + H₂O
CH3 CH₂OH + 30₂ → 2CO₂ + 3H₂O
What is one advantage of wind and hydroelectric power?
A. They are effective in any type of environment.
B. Neither harms wildlife.
C. Neither produces pollutants.
D. Both are inexpensive.
What is one advantage of wind and hydroelectric power?
A. They are effective in any type of environment.
B. Neither harms wildlife.
C. Neither produces pollutants.
D. Both are inexpensive.
Explanation:
one of the qnswer is flood control, irrigation support, and clean drinking water
explain how magic numbers are related to nuclear stabilize
Answer:
A magic number is a number of nucleons (either protons or neutrons, individually) that form complete bands within the atomic nucleus. As a result, atomic nuclei with a magic number of protons or neutrons are significantly more persistent than other nuclei.
Is CaO a molecular compound?
Answer:
It's a Ionic compound
Explanation:
To tell if CaO (Calcium oxide) is ionic or covalent (also called molecular) we look at the Periodic Table that and see that Ca is a metal and O is a non-metal. When we have a metal and a non-metal the compound is usually considered ionic.
Because we have a metal and non-metal in CaO there will be a difference in electronegativity between the metal and non-metal. This difference results in an electron(s) being transferred from the metal (lower electronegativity) to the non-metal (higher electronegativity). The results in the metal becoming a postitive ion and the non-metal a negative ion. The two opposite charges are attracted and form the ionic bond between atoms in Calcium oxide.
IUPAC NAME OF CH3CH2CH(CH3)CH2CH(C3H7)-CH3?
Answer:
the IUPAC name is: 2-ethyl-3-methyl-pentanal
Answer:
Thus IUPAC name is: 3-methylpentane. Was this answer helpful?
Explanation:
hope it will help you
Which of the following is a heterogeneous mixture?
a) milk
b) air
c) oil and vinegar
d) vinegar in water
Answer:
c) oil and vinegar
Explanation:
A heterogeneous mixture is a mixture that does not have a "uniform composition" (meaning that the entire mixture is not thoroughly mixed to be the exact same. In different parts of the mixture, there is a non-consistent / differing composition.)
Oil and vinegar, as you may know, do not thoroughly mix when put together--different parts of the mixture are made of different compositions. Some parts are made of oil, and some are a concentration of vinegar, but because they are not able to be mixed entirely, the mixture is considered a heterogeneous mixture. If you were to take different samples of different parts of the liquid, you would have a clear separation of oil and vinegar.
Milk is thoroughly milk--if you take out a tablespoon, it will be milk entirely--and it will have the same composition as all of the other milk in the bottle.
Air is complicated--and it can be described as either, but the question was likely intending the answer of oil and vinegar.
Vinegar and water do thoroughly mix. Vinegar absorbs water on a molecular level, so the mixture is thoroughly mixed when put together.
(Hope this helps!)
for the following reaction how many grams of h20 will be produced if you react 3.7 grams of B2H6? B2h6 +3O2-2hbo2+ 2 H20
Answer:
4.8 g H₂O
Explanation:
To find the mass of water, you need to (1) convert grams B₂H₆ to moles B₂H₆ (via molar mass from periodic table), then (2) convert moles B₂H₆ to moles H₂O (via mole-to-mole ratio from reaction coefficients), and then (3) convert moles H₂O to grams H₂O (via molar mass from periodic table).
It is important to arrange the ratios/conversions in a way that allows for the cancellation of units (the desired unit should be in the numerator). The final answer should have 2 sig figs because the given value (3.7 grams) has 2 sig figs.
Molar Mass (B₂H₆): 2(10.811 g/mol) + 6(1.008 g/mol)
Molar Mass (B₂H₆): 27.67 g/mol
1 B₂H₆ + 3 O₂ ---> 2 HBO₂ + 2 H₂O
^ ^
Molar Mass (H₂O): 15.998 g/mol + 2(1.008 g/mol)
Molar Mass (H₂O): 18.014 g/mol
3.7 g B₂H₆ 1 mole 2 moles H₂O 18.014 g
---------------- x --------------- x ----------------------- x ----------------- = 4.8 g H₂O
27.67 g 1 mole B₂H₆ 1 mole
3-chloropropylamine what is?
Answer:
a chemical compound
Which of the following tool components is unlikely to present a hazard
Gloves is the tool component which will unlikely present a hazard in this scenario.
What is Hazard?
This is referred to as potential source of harm when performing various types of activities.
Gloves will unlikely cause harm as it is used to prevent the risk of electric shock when handling electrical devices which is why it is the most appropriate choice.
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Assume that a normal curve is a good model for this data set. If 10,000 more observations were collected, what percentage of the observations would be greater than 98.02? In other words, what percentage of the area under the normal distribution curve would lie above 98.02 on the x-axis?
A) 5.9%
B) 2.96%
C) 2.5%
D) 0.0%
The percentage of the area under the normal distribution curve would lie above 98.02 on the x-axis is 2.5 % , option C is the answer.
What is Normal Distribution ?Normal Distribution is a probability distribution which is symmetric about the mean , The frequency is more near the mean and less far from the mean.
It is given in the data that
10,000 more observations were collected
the percentage of the observations would be greater than 98.02 = ?
According to the 68-95-99.7 rule,
It states that approximately
68% of the observations lie within σ of µ
95% of the observations lie within 2σ of µ.
99.7% of the observations lie within 3σ of µ.
The percentage of the observation between various intervals is attached in the image in the answer.
2.1 percent of the population is distributed in the intervals between two and three standard deviations , which is the zone above 2SD and below 3SD.
As 2.1 % is approximate , Therefore from the given option , 2.5%
The percentage of the area under the normal distribution curve would lie above 98.02 on the x-axis is 2.5 % , option C is the answer.
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Use the graph below to answer the following question. Observe the ionization energy needed to remove the 10th and 11th electrons. What does this indicate?
The ionization energy will increase substantially when 11th electron is removed compared to when the 10th electron is removed.
What is ionization energy?Ionization energy is the energy required to remove one or more electrons from a neutral atom in its gaseous state to form a positively-charged ion.
The ionization energy increases steadily as successive electrons are removed from an atom. A substantial increase in ionization energy occurs with the removal of an electron from a filled inner shell.
The 10th electrons is the last electron in the L shell of atoms. The 11th electron is the first electron in a filled inner shell.
Therefore, ionization energy will increase substantially when 11th electron is removed compared to when the 10th electron is removed.
Note that there was no attached graph and the answer was given based on the general trend observed in ionization energies.
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Pyroxene and Olivine are two minerals formed by the cooling of lava, whereas quartz and feldspar are formed as magma cools.
a. Based on the way they form, which two minerals will be comparatively bigger in size?
b. Why? Provide scientific evidence to support your answer
Quartz and Feldspar will be comparatively larger in size since they are formed from cooling of magma while Pyroxene and Olivine are formed by the cooling of lava.
What is the difference between magma and Lava?Magma is molten rock that is found deep within the earth's crust whereas Lava is molten rocks that comes up and flows on the earth's surface.
Minerals formed from magma and lava have comparatively different sizes.
Minerals formed from magma are larger in size than minerals formed from Lava. This is because minerals formed from magma undergo slower cooling, and thus, have a longer time to grow in size. However, minerals formed from lava have a relatively shorter cooling time and do not grow into very large sizes.
Therefore, Quartz and Feldspar will be comparatively larger in size since they are formed from cooling of magma while Pyroxene and Olivine are formed by the cooling of lava.
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What are the noble gas configurations for
-Li
-Na
-K
The noble gas configurations for
Li= [He] 2s¹, Na=[Ne] 3s¹ and K =[Ar] 4s¹.
Noble gas configurations are the term for the electronic configurations of the atoms for which the electronic configuration becomes very larger i.e, for the higher atomic numbers.
For the noble gas electronic configurations, the noble gas, which is before that atom is written.
So, the Lithium can be represented as [He] 2s¹.
So, the Sodium can be represented as [Ne] 3s¹.
So, the Potassium can be represented as [Ar] 4s¹.
Hence, the noble gas configurations for Lithium= [He] 2s¹, Sodium=[Ne] 3s¹ and potassium =[Ar] 4s¹.
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A scientist places a large beaker containing 325 g of 50degree Celsius water into a microwave. He has to run the microwave for 3 minutes until the water reaches a temperature at 92 degree Celsius. Calculate the amount of energy absorbed by the water.
The amount of energy absorbed by the 325g of water is 57,057J. Details about calorimetry can be found below.
How to calculate energy?The energy absorbed by a mass of substance can be calculated using the following formula;
Q = mc∆T
Where;
Q = quantity of heat absorbedm = mass of substancec = specific heat capacity∆T = change in temperatureQ = 325g × 4.18 × (92 - 50)
Q = 57,057J
Therefore, the amount of energy absorbed by the 325g of water is 57,057J.
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Which Ions oxidize aluminum?
Li^+, Ca^2+, Ag+, Sn^2+
Aluminum can be oxidized by [tex]Li^{+}[/tex] and [tex]Ca^{2+}[/tex]
What is oxidizing?Some of the metal corrodes (or oxidizes) and forms the corresponding metal oxide on the surface as a result of a chemical reaction between the metal surface and the oxygen in the air. The corrosion products that occur in some metals, like steel, are highly apparent and loose.
According to reactivity series (The array of metals in the descending order of their reactivities is referred to as the metals' reactivity series. It is sometimes referred to as the metals in the activity series.)
Lithium and calcium ions are more reactive than aluminum ion and they are less electronegative.
Since silver and tin are more electronegative than aluminum so, they cannot oxidize aluminum.
∴ [tex]Li^{+}[/tex] and [tex]Ca^{+2}[/tex] ions can oxidize aluminum.
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water boils at 100 degrees celsius at sea level. If the water in this experiment did not boil to 100 degrees celsius, what could the reason be?
Answer:
It depends on how high you are above sea level
Explanation:
I did an experiment in my Scince class that showed, the less air that is around water will lessen it’s boiling level. We put water in a glass beaker inside of our vacuum chamber, we made a vacuum in he chamber. Making a vacuum is like being on a mountain, the less air the lower the boiling point. The water then began to boil due to the water evaporating. When we reached to maximum vacuum that we could the water started to boil at 61°C. No the water was not very hot, it was just warm water that just so happened to also be boiling, cool right!!! Anyways, we played with dry ice the next day.
Hoped this helped.
Hope I earned your star rating or helpful rating from this.
the air pressure around the experiment is lower than at sea level
How do I draw energy level diagrams?
Energy levels inside an atom are the specific energies that electrons can have when energy occupies specific orbitals. Electrons can be excited to higher energy levels by absorbing energy from the surroundings, an equivalent light is emitted when an electron returns from a high energy state to a lower one. Representation of this diagrammatic is known as the energy level diagram.
Which of the following hereditary conditions is characterized by abnormally shaped blood cells?
Acne
Heart disease
Sickle cell anemia
Type 1 diabetes
Answer:
Sickle cell anemia
Explanation:
is an inherited genetic abnormality of hemoglobin (the oxygen-carrying protein found in red blood cells) characterized by sickle (crescent)-shaped red blood cells and chronic anemia caused by excessive destruction of the abnormal red blood cells.
Answer:
Sickle cell
Explanation:
I just took the test and it was correct.
6a. 0.898 mol sample of hydrogen gas at a temperature of 20.0 °C is found to occupy a volume of 24.5 liters. The pressure of this gas sample is
mm Hg.
6b. A sample of helium gas collected at a pressure of 991 mm Hg and a temperature of 300 K has a mass of 2.82 grams. The volume of the sample is
L.
8a. What volume is occupied by a 0.814 mol sample of xenon gas at a temperature of 0 °C and a pressure of 1 atm?
8b. A 1.21 mol sample of oxygen gas occupies a volume of
L at STP.
9b.What volume of carbon dioxide is produced when 7.95 liters of butane (C4H10) react according to the following reaction? (All gases are at the same temperature and pressure.)
butane (C4H10)(g) + oxygen(g) carbon dioxide(g) + water(g)
liters carbon dioxide
10b. What volume of carbon dioxide is produced when 0.504 mol of calcium carbonate reacts completely according to the following reaction at 0°C and 1 atm?
calcium carbonate ( s ) calcium oxide ( s ) + carbon dioxide ( g )
liters carbon dioxide
Gas law refers to the relationship between the temperature, volume and pressure of a gas.
What is gas laws?The term gas law refers to the relationship between the temperature, volume and pressure of a gas.
6a) PV =nRT
P = nRT/V
P = 0.898 * 0.082 * 293/24.5
P = 0.88 atm
6b) Number of moles of helium = 2.82 g/4 g/mol = 0.705 moles
Pressure = 991 mm Hg or 1.3 atm
V = nRT/P
V = 0.705 * 0.082 * 300/1.3
V = 13.3 L
8a) V = nRT/P
V = 0.814 * 0.082 * 273/1
V = 18.22 L
8b) 1 mole of oxygen occupies 22.4 L
1.21 mole of oxygen occupies 1.21 mole * 22.4 L/ 1 mole
= 27.1 l
9b) C4H10(g) + 13/2O2 -----> 4CO2 + 5H20
1 moles of butane produces 4 moles of CO2, It then follows that the volume of carbon dioxide produced is 4( 7.95 liters) = 31.8 litres
10b) CaCO3 ------> CO2 + CaO
Since the reaction is 1:1, 0.504 mol of CO2 is produced
PV =nRT
V = 0.504 * 0.082 * 273/1 atm
V = 11.3 L
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please help with this answe i do not how to to do it it
Answer:
1.20 M (3 s.f.)
Explanation:
In this question, we are trying to find the concentration of KCl after dilution. Note that the number of moles of KCl does not change.
[tex]g \div \frac{g}{mol} = g \times \frac{mol}{g} = mol[/tex]
Number of moles of KCl
= 44.7 ÷74.55
= 0.59960 mol (5 s.f.)
New volume
= 500 mL
= (500 ÷1000) L
= 0.5 L
Concentration after dilution
= 0.59960 ÷0.5
= 1.1992 mol/L
= 1.20 M (3 s.f.)
* M is the symbol for Molarity, which is also equal to mol/L
What is an open system?
A. A system that allows energy to move in and out but not mass
B. A system that allows energy and mass to move in and out of it
C. A system that allows mass to move in and out but not energy
OD. A system that does not allow energy or mass to move in or out of
it
Answer:
An open system is :-
B. A system that allows energy and mass to move in and out of it.
Example :-
Water boiling in a pot on a stove. (Without lid).
For each substance that can move across the dialysis membrane, determine whether it will move into the blood, out of the blood,
or in both directions,
Moves into the blood
Moves out of the blood
Moves in both directions
water
Ducose
urea
Na, K, and Ca ions
The movements of the substance across the dialysis membrane are as following: water: Moves in both directions.
Glucose: Moves into the blood.
Urea: Moves out of the blood.
Na, K, and Ca ions: Moves in both directions.
What is dialysis?Dialysis is a process of filtration and purification of blood by a machine. This machine helped those people whose kidney stop working and doesn't purify the blood.
Thus, the correct options are: water: Moves in both directions.
Glucose: Moves into the blood.
Urea: Moves out of the blood.
Na, K, and Ca ions: Moves in both directions.
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Chromium (III) oxide reacts with hydrogen sulfide gas to form chromium (III) sulfide and water. To produce 421 g of cr2s3, how many moles of cr2o3 and grams of cr2o3 are required?
Cr₂O₃ ( s ) + 3H₂S ( g ) → Cr₂S₃ ( s ) + 3H₂O ( l )
mol Cr₂S₃ = 421 : 200.19 g/mol = 2.103
mol Cr₂O₃ ≈ mol Cr₂S₃ = 2.103 ( equivalent coefficient)
mass Cr₂O₃ = 2.103 x 151.99 g/mol = 319.63 gr
The physical matter of which living or nonliving things are composed is called a ___
(Fill in the blank one word)
100 POINTS TO WHO EVER IS CORRECT!
Answer:
Substance
Explanation:
Any physical matter despite of living or non living things are composed by a set of molecules or atoms commonly known as substance
On specific living things are composed of biomolecules or cells where as non living things are composed of molecules and atoms
Answer:
Substances
Physical matters are divided into 3 states
solid stateLiquid stateGaseous stateAs per randomness of particles the order is
Gaseous>Liquid>SolidHazmat Poison gas is in what class?
HAZMAT Class 6 Toxic and infectious substances.
Answer:
CLASS 2 Gases
Explanation:
Hope this helps
Enter the coefficient of C₂H6O that correctly balances the equation:
C₂H60+302 → 2CO2 + 3H₂O
Answer:
1 C₂H₆O
Explanation:
The given equation:
C₂H₆O + 3 O₂ ---> 2 CO₂ + 3 H₂O
Reactants: 2 carbon, 6 hydrogen, 7 oxygen
Products: 2 carbon, 6 hydrogen, 7 oxygen
As you can see, the amount of each element on both sides is identical. Therefore, the reaction is already balanced. This means that the coefficient in front of C₂H₆O is 1. When writing the equation, writing the one is insignificant and usually left out.
Why is there a delay for the tides to react to the Moon's and Sun's gravitational effect?
A. Gravity is one of the slower forces in nature having to travel great distances.
B. The gravitational forces must overcome inertia and friction for the tides to take effect on water.
C. Water is relatively immune to the force of gravity delaying the tidal process.
D. There is no delay because the effects of gravity is constantly acting on bodies of water.
There is no delay because the effects of gravity are constantly acting on bodies of water. Hence, option D is correct.
What is the gravitational effect?Gravitation or just gravity is the force of attraction between any two bodies.
The Moon exerts over twice the gravitational pull of the Sun on Earth's tides because of its proximity to Earth. -The lunar tidal bulges are about twice the size of the solar tidal bulges. -The Sun's contribution to the tides is less than that of the Moon.
When the sun and moon are perfectly unaligned (they form a 90-degree angle relative to the earth), there are still tides because the moon's gravitational gradient is stronger than the sun's. The sun's gravitational gradient never completely cancels out the moon's.
Hence, option D is correct.
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