The Ka : 1.671 x 10⁻⁷
Further explanationGiven
Reaction
HA (aq) + H2O (l) ←→ A- (aq) + H3O+ (aq).
0.3 M HA
pH = 3.65
Required
Ka
Solution
pH = - log [H3O+]
[tex]\tt [H_3O^+]=10^{-3.65}=2.239\times 10^{-4}[/tex]
ICE method :
HA (aq) ←→ A- (aq) + H3O+ (aq).
0.3 0 0
2.239.10⁻⁴ 2.239.10⁻⁴ 2.239.10⁻⁴
0.3-2.239.10⁻⁴ 2.239.10⁻⁴ 2.239.10⁻⁴
[tex]\tt Ka=\dfrac{[H_3O^+][A^-]}{[HA]}\\\\Ka=\dfrac{(2.239.10^{-4}){^2}}{0.3-2.239.10^{-4}}\\\\Ka=1.671\times 10^{-7}[/tex]
On the microscopic level, which answer best explains the concept of energy
transfer as heat when a hand is placed in water that is 50 °C. Body temperature is
37 °C. Choose the correct answer. *
Answer:
See explanation
Explanation:
The question is incomplete but i will try to help you the much i can.
You see, we already know about the fact that energy is transferred from a hotter object to a cooler object. This is largely because of the collision of the molecules of a hotter body with the molecules of a cooler body ultimately leading to a transfer of energy from the hotter body to the cooler body. This now makes the temperature of the cooler body to rise.
Keep in mind that temperature is a measure of the average kinetic energy of the molecules in a body.
Hence, since the water is at a higher temperature, energy is transferred from the water to the hand and the temperature of the hand rises accordingly.
explain why iron can displace copper from copper II nitrate solution, but copper cannot displace iron from iron III nitrate solution
Answer:
Iron metal is more reactive than copper.
Explanation:
Iron metal is more reactive than copper. ... Cu is less reactive than iron, therefore, cannot replace iron from iron sulphate (FeSO4). we have already seen that iron is more reactive than copper. So that means that in this reaction, copper is less reactive than iron. That means copper cannot displace iron. It cannot kick out iron from a sulfate.
Use what you have learned about the types of energy that travel from the Sun to Earth to match each term with its description.
Infrared Radiation
Ultraviolet Radiation
Radiation
Electromagnetic Waves
Visible Light
How Sun’s energy travels to Earth
Causes skin cancer and sunburn
Made of colors that the eye can see
Takes the form of heat
Transfer of energy from Sun
The type of energy is given as under :
How Sun’s energy travels to Earth - Electromagnetic WavesCauses skin cancer and sunburn - Ultraviolet RadiationMade of colors that the eye can see - Visible LightTakes the form of heat - Infrared RadiationTransfer of energy from Sun - Radiation.How is the tranfer of energy form sun to earth ?The sun transfers energy to the earth in the form of electromagnetic waves and the warm up the earth's upper air.
Some of the radiation that enters the earth get absorbed by the land surface. The sun is ths responcible for the energy distribution.
The visible light is part of wavelength that carries colors the human eyes can see. The infrared is the range that transfers the heat from the sun.
Find out more information about the Earth.
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Stars making a circular motion across the sky is evidence of
Answer:
because they are actually moving, or because they reflect our motion through space.
Explanation:
Stars making a circular motion across the sky is evidence of the earth's rotation.
This is because when the earth rotates it appears to us like the stars are moving.
Liquids and solids are referred to as "condensed phases" because the attractive forces cause molecules to become stationary. leave little space between the molecules. create large spaces between the molecules. that hold the molecules together are negligible.
Answer:
leave little space between the molecules.
Explanation:
Matter is made up of small particles called molecules. These molecules present in matter are arranged inside its bulk.
In liquids and solids, the molecules are arranged very close together in such a way that there is only a little space between them. This is why liquids and solids are referred to as "condensed phases".
They are quite unlike gases where there is a lot of space between gas molecules.
Answer:
B
Explanation:
What does it mean for a solution to be supersaturated?
A. More solute has dissolved than should be possible.
B. More solute can still be dissolved in the solvent.
C. The dissolving speed was increased through heating.
D. The maximum amount of solute has been dissolved.
Explanation:
A supersaturated solution is a solution that contains more than the maximum amount of solute that is capable of being dissolved at a given temperature. The recrystallization of the excess dissolved solute in a supersaturated solution can be initiated by the addition of a tiny crystal of solute, called a seed crystal.
Supersaturated solutions have much more dissolved solute as saturated solutions, and then they can dissolve greater solute than that of the solution can at a specific temperature.
What is supersaturated solution?
Whenever the concentration of even a solute surpasses the concentration determined by the quantity equilibrium solubility, the chemical solution is said to be supersaturated.
.
A solution, which includes more than just the maximum quantity of solute that may be dissolved at a particular temperature is called a supersaturated solution. The injection of a microscopic crystal of solute, known as a seed crystal, can start the recrystallization of additional dissolving solute in a supersaturated solution.
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Convert 12.0 g of FeO into moles.
Answer:
of FeO into moles.ififdjdjjfjdjfjfjfjfjfjfjfjfjfjfjf
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 0.167moles are there in 12.0 g of FeO into moles.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number. The stoichiometry represents the number of moles.
Mathematically,
number of moles of FeO =given mass of FeO ÷ molar mass of FeO
Molar mass of FeO =71.8444 g/mol
mass of FeO = 12.0 g
Substituting all the given values in the above equation, we get
number of moles of FeO = 12.0 ÷71.84
number of moles of FeO =0.167moles
Therefore, 0.167moles are there in 12.0 g of FeO into moles.
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The Rio Grande river flows through the South Texas Plains ecoregion of Texas. The river is a major source of water for cities and farms in the area. Sometimes, so much of the Rio Grande's water is used that the river does not reach the Gulf of Mexico. How does the loss of river water affect ocean plants near the mouth of the river?
Answer:
What are the answer choices
Explanation:
Answer:
The answer choices are
Explanation:
A. The ocean plants cause more weathering.
B. More algae grows and competes for resources.
C. the slow water causes more erosion.
D. Less sediment is deposited in the soil.
But the answer is (D. Less sediment is deposited in the soil.)
According to this Bohr model, in what period would this element be found?
Answer:
yes
Explanation:
yes
H.C.F of 64 and 96 is
Answer: 32
Explanation: but you can find them on goggle
why handpicking is necessary after winnowing?
please mark as brainliest
This answers may help you
Which condition most likely causes a V-shaped valley to form? A Fast-moving river B Deposition of rock C Erosion by wind D Slow-moving glacier
Answer:
C
Explanation:
5.6 x 10^3 cm = ___m
Answer:
56 m
Explanation:
5.6 x 10^3 = 5600
5600 / 100 = 56m
What is the result of the following calculation? Record to the correct number of significant figures. 7.94 g + 0.0132 g = ?
Select one:
a) 7.95 g
b) 7.9 g
c) 7.953 g
d) 7.9532 g
To solve such we need to know the concept behind significant figures. Addition, subtraction, multiplication and division follow the rules of significant figures. Therefore, the correct option is option A that is 7.95 g.
What is significant figures?
Significant figures of a number in positional notation are digits in the number that are reliable and necessary to indicate the quantity of something.
Rules for counting the significant figures are :
Zeroes before non zero digits are not significant
Zeros between non zero digits are significant.
Zeroes after non zero digits are not significant.
When we add two decimal numbers then, the final answer would be according to the number which have least significant number.
7.94 g + 0.0132 g = 7.95g
Since among 7.94 and 0.0132, 7.94 has the least significant numbers that is 3. So, answer should have 3 significant figures, answer will be 7.95.
Therefore, the correct option is option A that is 7.95 g.
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what are the uses of glycerin?
Explanation:
This medication is used as a moisturizer to treat or prevent dry, rough, scaly, itchy skin and minor skin irritations (e.g., diaper rash, skin burns from radiation therapy). Emollients are substances that soften and moisturize the skin and decrease itching and flaking.
reserve one spot for dmndburgess thx
Answer:
thanks for the points have a nice day :D
Explanation:
Is BaOH2 soluble or insoluble in water?
Answer:
Explanation:
Tough question.
The answer is very dependent on the temperature of the water. At 0o C, less than 5 grams is soluble in water.
The curve increases as the temperature increases. At 80oC about 35 grams is soluble in water 100 mL of water. So Ba(OH)2 is very soluble at higher temperatures.
Maybe the question can be resolved just a little better at room temperature. The solubility is still less than 5 grams / 100 mL. That makes it slightly soluble or more soluble than other things.
So to answer the question, you need to specify the temperature. I would say it is, but be prepared to defend your answer.
What is rate of reaction? Discuss in brief slow and fast reactions.
7. A mix of two gases is in a balloon at room temperature. One gas becomes a liquid when placed in a household freezer, while the second one stays as a gas. How would you expect the volume
change when the balloon is placed in the freezer?
A. It shrinks gradually
B. It shrinks gradually, then suddenly gets a lot bigger
C. It shrinks gradually, then suddenly gets a lot smaller
D. It grows gradually
E. It grows rapidly
Please help :(((
Answer:
it shrinks gradually, then suddenly gets a lot smaller.
Explanation:
During the initial cooling the balloon begins to shrink. At the point where the 2nd gas turns to liquid the volume reduces drastically because liquids take up much less volume than their gas counterparts.
Answer:
do you go to hphs?
Explanation:
cuz i need this for chemistry:/
When a fast moving particle runs into a slower moving particle
what happens ?
Answer:
It depends upon the mass of the particles also. Assuming equal mass, then the slower moving particle gains some energy, and the faster-moving particle loses energy. However, if the slower moving particle had greater mass, it could transfer energy to the faster-moving particle.
Explanation:
Hope I could help! :)
Which statement describes the components of a mixture?
1.
Each component gains new properties.
2.
Each component loses its original properties.
3.
The proportions of components can vary.
4.
The proportions of components cannot vary.
Answer: 3
Answer: The proportions of components can vary.
Explanation:
A mixture is a combination that has to do with two or more substances. Some characteristics or properties of mixtures are that the substances that are added together retain their properties.
Also, the proportion of the components can vary and the components can be separated.
Therefore, the answer to the question will be option 3 "The proportions of components can vary".
The only way an object's speed or direction of motion can be changed is if a(n) _______ force acts on it.
A.
frictional
B.
unbalanced
C.
balanced
D.
electrical
Answer:
unbalanced
Explanation:
got in right on study islands
30 POINTS!!! Please Help With this!!!!
A chemical reaction is shown below. Fe +H,0 – Fe 0,+H What are the products in the equation? A FeO, only B Fe only C Fe and H2O D Fe 0, and H
Anita did not make the track team this year, and she feels really disappointed and upset. What question would most likely redirect her thinking and provide a solution?
Answer:
Anita did not make the track team this year, and she feels really disappointed and upset. What question would most likely redirect her thinking and provide a solution?
Why did this terrible thing happen to me?
What other sports can I try this spring?
Why does everything I attempt go wrong?
Why did Karen get on the team but I didn't?
Answer - What other sports can I try this spring?
Explanation:
Failures and successes are part of our daily lives as humans. It can be very challenging for one to accept his or her failures and bring oneself above it.
when failure occur, the best way to reverse the negative impacts it brings is to move forward and decide on what next to do.
The actions that must be taken in the processes should be quite productive enough to bring back the results one desired.
When the effects of failures prove irreversible, one would then give the mind a diversion and help his or herself think their way though the failure that was encountered.
Is heat a form of kinetic energy or potential energy?
What is the Name of the Covalent Compound, Se3P4?
Answer:
For example, the compound FeSO4 is called iron(II) sulfate, because it contains Fe2+.
Explanation:
please mark me as brainliest thank you
Which of the samples contains the most atoms? Use evidence from the table to explain your answer.
Answer: Sodium/Na
Explanation: Molar mass is basically a measure of how heavy 6.02 x 10^23 atoms of a substance is, measured in grams.
So, if Sodium has the lowest molar mass then that means it’s molecules are very light. I’ll give a comparison: if you have 10 kilograms of bricks and 10 kilograms of feathers, will you have more feathers or bricks? Feathers, of course.
Mathematically it looks like this
50g/22.99g/mol = 2.17 mol
2.17 mol • 6.02 x 10^23 = 1.31 x 10^24 atoms
50g/58.93g/mol = 0.85 mol
You can see that as molar mass increases that the number of moles, and consequently, atoms, decreases.
Hope this helped
1 mole = 6.02 x 10^23 molecules. 1 mole= 22.4 L How many liters does 5.0 x 10^24 molecules occupy? .37 L 1.3 x10^49 L 190L or 6.7 x 10^49
Answer:
185.92 L
Explanation:
Given data:
1 mole = 6.022× 10²³ molecules
1 mole = 22.4 L
Volume occupy by 5.0× 10²⁴ molecules
Solution:
1 mole = 6.022× 10²³ molecules
5.0× 10²⁴ molecules × 1 mole / 6.022× 10²³ molecules
0.83× 10¹ mol
8.3 moles
1 mole occupy 22.4 L
8.3 mol × 22.4 L / 1 mol
185.92 L
When we add friction into the skate park what happens to the skater? Skate park questions
Answer:
If you put friction in to skating rink then obvioulsy the skaters wont be able to glide and skate.
Explanation:
friction is power that disturbes the moving power. places like skating rink and slides try to have the least amount of friction.