Calculate the degree of hydrolysis of a 02.M solution of NaHCO3. Ka1 = 4.3x10-7 and Ka2 = 4.8x10-11.
The degree of hydrolysis of 02.M solution of NaHCO₃ = 2.33 * 10⁻⁸
Given data :
Concentration of NaHCO₃ = 0.2 M
Ka1 = 4.3 * 10⁻⁷
Ka2 = 4.8 * 10⁻¹¹
Determine the degree of hydrolysisNaHC0₃ ----> Na⁺ + HCO₃
where : Na⁺ is a stronger and HCO₃ is weaker
Therefore;
hydrolysis will occur at HCO₃
HCO₃ + excess water --> H₂CO₃ + OH⁻ --- kh
kh = hydrolysis constant
Also
Kh = Kw / Ka1
where ; Kw = ionic product of water ( 10⁻¹⁴ ) , Ka1 = dissociation constant
Finally the degree of hydrolysis is
Kh = ( 10⁻¹⁴ ) / 4.3 * 10⁻⁷
= 2.33 * 10⁻⁸
Hence we can conclude that The degree of hydrolysis of 02.M solution of NaHCO₃ = 2.33 * 10⁻⁸
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2. Which of the following is NOT a type of ESP?
Like liquids gases have definite shape and valume true or false?
Answer:
False
Explanation:
A gas has neither a definite shape nor a definite volume.
Which two photos show electric force in action?
D A
O B.
OC
D D
Answer:
b and d show electric force in action
Explanation:
What is the mass of a neutron close to
Answer:
The free neutron has a mass of 939,565,413.3 eV/c2, or 1.674927471×10−27 kg, or 1.00866491588 u. The neutron has a mean square radius of about 0.8×10−15 m, or 0.8 fm, and it is a spin-½ fermion.
Mass: 1.67492749804(95)×10−27 kg; 939.56542052(54) MeV/c2; 1.00866491588...
Composition: 1 up quark, 2 down quarks
Electric charge: 0 e; (−2±8)×10−22 e (experimental limits)
Magnetic polarizability: 3.7(20)×10−4 fm3
Claims • Evidence • Reasoning Make a claim about along which type of tectonic plate boundary this fault would be common. Provide evidence to support the claim and
explain your reasoning.
The continents of today contain remnants of their distant history. The presence of glaciers, fossils, and complementing coasts provides evidence of how the plates originally interacted. Plants and animals used to exist, and fossils when and where they did.
What is fossil ?Any surviving remnants, impression, or evidence of a once-living creature from a previous geological epoch is referred to as a fossil. Examples include fossilized bones, shells, exoskeletons, animal or microbe impressions in stone, amber-preserved artifacts, hair, petrified wood, oil, coal, and DNA traces.
There are four basic categories of fossils, each generated in a unique method and useful for conserving various kinds of animals. These include true form fossils, mold fossils, cast fossils, and trace fossils.
In river valleys, cliffs, hillsides, and man-made exposures like quarries and road cuts, sedimentary rocks of the appropriate age are exposed, and these are the places where fossils are most commonly found.
Thus, Plants and animals used to exist, and fossils when and where they did.
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A store sell 21 piece of clothing every 45 minutes.How long will it take the store to sell 100 pieces of clothing?
Explanation:
21 piece =45 mins
100 pieces= x
on cross multiplication
21x=45×100mins
21x =4500mins
x =4500mins÷21
=214.3mins or 3.57hrs
HURRY
Show step-by-step
If 20-g of O2 is mixed with 2-g of H2 and the mixture is ignited, what is the mass of water that may be produced?
Answer:
11.647g of water may be produced.
Explanation:
chemistry of the reaction:
2O2 + 2H2 ----> 2H2O + O2
64g + 4g yields 36g of water,
20g + 2g yields 11.647058824g of water
HELP WILL GIVE BRAINLIEST
What is heat energy indirectly measured by?
A. temperature
B. recording the motion of molecules
C. kinetics
Answer:
Temperature
Explanation:
.
Answer:
a
Explanation:
I just took the test
Which energy involves energy of motion or work?
kinetic energy or potential energy
kinetic energy
Explanation:
energy associated with motion is kinetic energy
Answer: Kinetic Energy
Explanation: Kinetic energy is the energy of mass in motion. The kinetic energy of an object is the energy it has because of its motion. ... Note that energy is a scalar quantity, i.e., it does not depend on direction, and it is always positive.
helppp
Balancing Equation
Answer:
Answer: C3H8 + 5O2 → 3CO2 + 4H2O.
Explanation:
HELP ME OUT PLS!!!!!!
During the first half of the lunar cycle, the amount of light visible to Earth gets larger and larger. During this half of the cycle, the moon is said to be:
O eclipse
O rotation
O waning
O waxing
How many moles of N2 will be produced if 3.5 moles of Oz react?
Answer:
2.3 mol of N2
Explanation:
mol N2 = 3.5 mol O2 x. 2 mol N2
3 mol O2. = 2.3 mol N2.
Write the equation for the reaction of carbonic acid with hydroxide to produce hydrogen carbonate and water
Answer:
HCO3− + OH− ⇌ CO32− + H2O (fast)
Between pH values of 8 and 10, all the above equilibrium reactions are significant
NEED HELP ASAP!!!! Select 3 pieces of evidence listed in the article that show how human behavior impacts the planet.
Question 4 options:
Development of synthetic drugs and fabrics
Increased biodiversity and fewer extinctions
Nuclear energy and bomb testing
Increased nitrogen fixation
Answer:
Development of synthetic drug and fabric
Nuclear energy and bomb testing
Increased nitrogen fixation
Explanation:
This is because these things help global warming and animal extinction
A molecular _________
will tell you how many and what
kinds of atoms are in a molecule, but not how they are
arranged.
Answer:
A molecular formulae________
will tell you how many and what
kinds of atoms are in a molecule, but not how they are
arranged.
25. An element has two stable isotopes. One isotope has a mass of 62.9 amu and an abundance of 69.2%.
The other isotope has a mass of 64.9 amu and an abundance of 30.8%. Show how to calculate the
average atomic mass of this element and give the value with the correct units and significant figures.
Don't just give the answer. Show your work
Show work:
Answer:
Answer:
Average Atomic Mass= 63.5 amu
Explanation:
Average Atomic Mass Equation:
(Mass 1)(% Abundance) +(Mass 2)(% Abundance)
Plug in Variables:
Make sure to convert the percentages into decimals. (Left two places)
Use the order of operations when solving.
(62.9)(0.692) + (64.9)(0.308) = AAM
Multiply each side
43.5268 + 19.9892 = AAM
Add the products together
63.516 = AAM
Add proper unit and satisfy the 3 significant figures needed
63.5 amu
Please answer asap!
Listed in the Item Bank are some key terms and expressions associated with the categories seen in the Venn Diagram. To find out
more information about items, some have more details available when you click on them. Drag and drop each item onto the proper
area of the diagram. If an item describes more than one category, be sure to place it in the overlapping space.
ITEM BANK: Move to Bottom
A ball is thrown up into the air and rises
until it begins to fall
Ball on the edge of a cliff
Can be transformed into other form of
energy
Gravitational, elastic, chemical
Increases with mass
Kinetic Energy
Both
Potential Energy
Based on the item bank, the various classification for each item are:
Both (Kinetic energy and Potential energy):
Increases with mass.Can be transformed into other form of energy.A ball is thrown up into the air and rises until it begins to fall.Potential energy:
Gravitational, elastic, chemical.What is energy?Energy can be defined as the ability to do work. Thus, energy must be possessed or transferred to an object or physical body before it can be used in doing a work or heating a system.
The forms of energy.In Science, there are different forms of energy and these include the following;
Gravitational energyPotential energyElastic energyChemical energyKinetic energyThe classification of the items.Both (Kinetic energy and Potential energy):
Increases with mass.Can be transformed into other form of energy.A ball is thrown up into the air and rises until it begins to fall.Potential energy:
Gravitational, elastic, chemical.Read more on potential energy here: https://brainly.com/question/1242059
what is dalang puppeteer
What about Kevlar makes it so strong? (1 point)
A. Kevlar is made with spider silk, a naturally strong material.
B. The molecules stack together in crystal-like structures.
C. The molecules are short and create density
D. The molecules in Kevlar form a cylindrical-like structure.
WILL GIVE BRAINLIEST
I believe the answer is (B) as molten Kevlar when spun into fiber, its polymers have a crystalline arrangement.
Hope that helped!
Answer:
The molecules stack together in crystal-like structures
Explanation:
i've taken the test
A 12 kilogram eagle is flying at 15 meters/sec. What is the kinetic energy (in joule) of the eagle? Use exact numbers; do not estimate.
The kinetic energy J of the eagle is mathematically given as
K.E=1350
What is the kinetic energy (in joule) of the eagle?Question Parameters:
A 12-kilogram eagle is flying at 15 meters/sec.
Generally, the equation for the kinetic energy is mathematically given as
K.E=1/2mv^2
Therefore
K.E=1/2(12)(15)^2
K.E=1350J
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Why are there often holes in slices of bread? The holes are created by bubbles of carbon dioxide gas (CO2) that form in the bread dough before and during baking. These bubbles form when single-celled organisms called yeast break down glucose (C6H12O6), a sugar in flour. In addition to carbon dioxide gas, a substance called ethanol (C2H6O) forms during this process.
In the chemical reaction described in the passage, which of the following are reactants?
The given reaction describes the decomposition of glucose into ethanol and carbon dioxide. This process is called fermentation. The reactant of this reaction is glucose.
What is fermentation ?Fermentation is the process of conversion of sugar molecule into other substance b the action of microbes such as yeast. In cellular respiration the glucose molecule is converting to carbon dioxide and water. Where as, in fermentation, the glucose is converting to carbon dioxide and ethanol.
The balanced chemical equation of the breaking of glucose into carbon dioxide and water is written as follows:
[tex]\rm C_{6}H_{12}O_{6} \rightarrow 2CO_{2} + 2C_{2}H_{5}OH.[/tex]
According to this reaction, one mole of glucose molecule gives 2 moles of carbon dioxide and 2 moles of ethanol. Hence, reactant in this reaction is glucose.
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The simple substances of matter are called:
molecules
elements
compounds
The correct answer is element
what is not a part of the digestive system
Answer: The spleen plays multiple supporting roles in the body. It acts as a filter for blood as part of the immune system
Explanation:
Answer:
The Pancreas is an organ located in the abdomen. It is not a part of the human digestive system, although it does produce the pancreatic juices that act as enzymes to HELP in digestion. In other words, the Pancreas plays an important role in converting the food we eat into fuel for the body's cell.
50 POINTS WILL GIVE BRAINLYEST!!!!!!!!!
If you are holding a really hot cup of hot chocolate, the heat from the mug will transfer to your hand.
Question 6 options:
True
False
Answer:
true
Explanation:
Heat travels from the hot cocoa in the cup to your hands. No energy is transferred. Heat is transferred from your hands to the hot cocoa in the cup.
If you are holding a really hot cup of hot chocolate, the heat from the mug will transfer to your hand is a true statement.
What is the transfer of heat?Heat transfer is any or all of a variety of processes that are thought to function as mechanisms to move entropy and energy from one place to another. Common names for the specific mechanisms include convection, heat radiation, and conduction (see thermal conduction).
The heat always transfers from a hot body to a cold body. The heat transfer from hot the cup to the hands until the temperature of the hand and the cup will be the same. There are three types of transfer of heat.
Therefore, it is true that the heat from the mug will travel to your hand if you are holding an extremely hot cup of hot chocolate.
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1. What is contained in the nucleus of an atom?
A. Protons only
B. Electrons only
C. Electrons and Protons
D. Protons and Neutrons
Answer:
Your answer is
D. Protons and Neutrons
Hope you have a great day!
Answer:
Protons and neutrons
Explanation:
Let's know some
Protons are positively charged particlesNeutrons are neutral charged particlesElectrons are negatively charged particles.Mass number of a element=No of protons+No of neutrons
Which is an example of kinetic energy?
0 A
an arrow in flight
B..a ball right before it is dropped
c. a warm bicycle chain
D. a gallon of gasoline
A
I m not sure ...........................
during a storm, a tree fell over into a river. use evidence to support your explanation of what happened to the tree?
Answer:
The wind knocked it over.
Explanation:
This is true because in many storms, there are very high wind speeds.
7. Which of the following medications should most likely not be taken prior to
operating heavy machinery?
a. Penicillin (antibiotic)
b. Famotidine (stomach)
C. Diphenhydramine (Benadryl)
d. Hydrochlorothiazide (diuretic)
Diphenhydramine medications should be taken by person who operate heavy machinery.
What is Medications?Medications refers to drugs or substances taken into the body to relieve of pains or symptoms of diseases.
What is Diphenhydramine?Diphenhydramine is also called Benadryl and is antihistamine take to relieve symptoms of pains, allergy, hay fever, and the common cold symptoms like cough, sneezing, sore throat, cold , cattarh and so on. It is used to treat dizziness, nausea, vomiting and motion sickness. Diphenhydramine can be taken to relax the body and fall asleep.
Therefore, Diphenhydramine medications should be taken by person who operate heavy machinery because it will help relive pains and symptoms of cold which can be due to vigorous activity of operating heavy machinery.
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what is the correct name for Sn3(PO4)2