Answer:
Given
[HONH2] = 0.45M
[OH-] = 5.26 x 10-6 M
HONH2 + H2O -------------> HONH3+ + OH-
Initial 0.45 55 0 0
at equilibrium 0.45-x 55-x x x
Given
[OH-] = x = 5.26 x 10-6 M
Therefore [HONH3+] = x = 5.26 x 10-6 M
pOH = -log[OH-] = -log(5.26 x 10-6) = 5.279
=> pH = 14- pOH = 8.72
From hendersen-hasselbach equaiton
8.72 = pKa + log(0.45/5.26 x 10-6)
=> pKa = 3.788
=> pKb = 14-3.788 = 10.21
percent of ionization = 5.26 x 10-6 * 100/0.45 = 1.17 x 10-3 %
concentration of NaOH required to make the same pH= [OH-] = 5.26 x 10-6 M
Percent of ionization of NaOH = [OH-]*100/NaOH = 5.26 x 10-6 *100/5.26 x 10-6 = 100%
PLEASE HELP RN ITS URGENT
Answer: transporting oxygen-rich blood to the body
Explanation:
why is there no reaction between copper and sodium chloride
remember I am talking of copper alone and not copper sulfate.
Answer:
If the solution is not in contact with air, nothing will happen. If the solution is in contact with air, it will be not a reaction between copper, water and sodium chloride..
in the end there will be no reaction
Where else has lead contamination of water occurred in recent history?
The diagrams below represent some respiratory structures in three organisms. The labeled structures in these organisms all have a similar function. What is the main function of the labeled structure(s) in each organism?
A)Circulation of blood
B)Digestion of food
C)Production of food
D)Exchange of gases
Answer:
D
Explanation:
Lungs, Moist skin , Gills is in the exchange of gases system
The correct answer is D.
The structure of human lungs is first demonstrated in an organism.
Lungs are the respiratory organs. They are made up of alveoli.Main Function :The main function of lungs is the gaseous exchange. This gaseous exchange occurs in the alveoli. Oxygen from atmosphere comes into the lungs through nostrils, nasal cavities, pharynx, larynx, trachea, bronchi and finally reaches the lungs. Then gaseous exchange occurs between blood and alveoli. Oxygen enters into the blood and carbon dioxide leaves the blood.The structure of Earthworms Moist skin is second demonstrated in an organism.
The earthworm has no special respiratory organs like lungs or gills. Respiration takes place through the body wall. The outer surface of the skin is richly supplied with blood capillaries which aid in the diffusion of gases. Oxygen diffuses through the skin into the blood while carbon dioxide from the blood diffuses out. The skin is kept moist by mucous and coelomic fluid and facilitates exchange of gases.The structure of Fish Gills is third demonstrated in an organism.
The gill filaments in fish have functions like lungs in people: it's the organ responsible for absorbing oxygen and expelling carbon dioxide. The gills also regulate levels of mineral ions and the pH of the blood, as well as being the primary site of nitrogenous waste excretion, in the form of ammonia.Learn more about Respiratory System here:
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Arrange the following lons in order
of increasing size
giving reasons
Na+, Mg2+, AL3+ (4Na,12Mg,13Al)
Answer:
na+then mg2+ then al3+
Explanation:
this is due to the distance between their nucleus and valence electron
How many TOTAL atoms make up the molecule 3K2SO4?
PLEASE ANSWER ASSSSPAPPPP
Answer:
CH4 + 2O2 ----> 2H2O + CO2
is chex mix an example of a element or compound?
Answer:
Chex mix is not an example of a element or compound.
Chex mix is an example of a mixture
l hope it helps
PLS HELP DECODE THIS
The number of protons and neutrons are used to determine the:
(C1) T (H4) M (A1) C (H2) A (F4) S
How many moles are in 6.38x10^22 molecules/atoms of CO2?
Answer:
0.106 moles
Explanation:
To solve this problem we will need to use Avogadro's number, it is the number of molecules (or atoms) in one mol.
We convert molecules into moles using that number:
6.38x10²² molecules ÷ 6.023x10²³ molecules/mol = 0.106 moles
There are 0.106 moles in 6.38x10²² molecules of CO₂.
what must happen for heat to be transferred by thermal conduction?
The transfer of heat between substances by thermal conduction is only possible when they are in direct contact with each other.
What is Thermal Conduction ?The transfer of heat from the hotter end to the colder end of object is known as conduction.
The spontaneous flow of Heat from a hotter to a colder body ie, heat is conducted from the hotplate of an electric stove to the saucepan when it is in contact with it.
The better the conductor, the more rapidly heat will be transferred.
Thus, The transfer of heat between substances by thermal conduction is only possible when they are in direct contact with each other.
Learn more about Conduction here ;
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help, please...I have no idea what I'm doing :D
Answer:
Hey!
Multiply the % × amu
27.88×(.922)= 25.71 lmk if you need help with the rest!Air Pollution Quiz - Match the terms e defintions
1) Air pollution
2) Acid rain
3) Smog
4) Ground level ozone
5) Global warming
6) Greenhouse effect
Answer:
1) F. harmful gases and solid particles that enter the atmosphere
2) C. pollutant gases react with water vapor
3) B. mixture of smoke, gas, and fog
4) E. sunlight interacts with pollutant gases
5) A. gradual increase in the overall temperature of the earth
6) D. gases are trapped by heat and raise the temperature of the atmosphere
hope this helps
When a chemical bond exists between two atoms, an electrical attraction exist between the __________ of each atom and the ___________ of the other atom no matter what type of bond you are talking about.
Answer:
c
Explanation:
treswdftgyuiuytredscfvghjk
Pb(NO3)2+K2CrO4 →PbrCrO4 +2KNO3 classify the chemical reaction
What kind of chemical reaction is H2SO4 + 2 KOH K2SO4 + 2 H2O
Provide an explanation for each of the following strange facts about Mercury:
1. Mercury’s atmosphere is incredibly thin.
2. The length of a Mercury year is about 1.5 times longer than a Mercury day.
3. The temperature range on Mercury is about 590 °C.
Answer:
Explanation:
1. Mercury’s atmosphere is incredibly thin.
It's thin because the atmosphere is made up of atoms blasted off its surface by the Solar wind and also consist of the stream particles coming from the outer layer of the sun
2. The length of a mercury year is about 1.5 times longer than a mercury a day.
Mercury revolves around the sun very quickly but rotates around its axis very very slowly
3.The temperature range on Mercury is about 590 °C.
During the day, temperatures on Mercury's surface can reach Very High But, the planet has no atmosphere to retain that heat
Pl help it’s for a grade I will give Brainly
Answer:
its B
Explanation:
please help i need to do good in this class
Answer:
Explanation:
di) number of protons is 12 for all, number of neutrons is 13 for mg- 25 and 14 for mg-26
How many atoms of silicon are in 0.75 mol of disilicon hexahydride, Si2H6? A.4.5x 1023 atoms B.6.02 x 1023 atoms C.8.0 x 1023 atoms D.9.0x1023 atoms
Answer:
D. 9.0x10²³ atoms
Explanation:
First we use Avogadro's number to calculate how many molecules of Si₂H₆ are there in 0.75 mol:
0.75 mol * 6.023x10²³ molecules/mol = 4.52x10²³ moleculesThere are 2 Si atoms in one Si₂H₆ molecule, that means that in 4.52x10²³ Si₂H₆ molecules there will be:
2 * 4.52x10²³ = 9.03x10²³ Si atomsThus the answer is option D.
2
Convert -27°C to Kelvin.
Answer:
-27 C converted to Kelvin is 246.15 Kelvin.
Explanation:
Hope this helps
Answer:
246.15K
Explanation:
Formula: (-27°)C + 273.15 = 246.15K
8.
Sulfur trìoxide decomposes to sulfur dioxide and oxygen gas as
shown in the following reaction:
2503 (g) 2502 (g) + O2 (g)
Given a 240.0 g sample of sulfur trioxide (MM = 80.1 g/mol), how many
grams of oxygen (MM = 32.0 g/mol) are produced, assuming the
decomposition goes to completion?
g
Your answer should be rounded to three significant figures. Do not include units in your
answer
Mass of Oxygen : 47.9
Further explanationGiven
2S03 (g)⇒ 2S02 (g) + O2 (g)
240 g SO3
Required
mass of Oxygen
Solution
mol SO3 :
= 240 g : 80.1 g/mol
= 2.996
From the equation, mol O2 :
= 1/2 x mol SO3
= 1/2 x 2.996
= 1.498
mass O2 :
= 1.498 mol x 32 g/mol
= 47.9
Taking into account the reaction stoichiometry, given a 240.0 g sample of sulfur trioxide, 47.95 grams of oxygen are produced, assuming the decomposition goes to completion.
Reaction stoichiometryIn first place, the balanced reaction is:
2 SO₃ → 2 SO₂ + O₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
SO₃: 2 molesSO₂: 2 moles O₂: 1 moleThe molar mass of the compounds is:
SO₃: 80.1 g/moleSO₂: 64.1 g/mole O₂: 32 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
SO₃: 2 moles ×80.1 g/mole= 160.2 gramsSO₂: 2 moles ×64.1 g/mole= 128.2 grams O₂: 1 mole ×32 g/mole= 32 gramsMass of oxygen producedThe following rule of three can be applied: if by reaction stoichiometry 160.2 grams of SO₃ form 32 grams of O₂, 240 grams of SO₃ form how much mass of O₂?
[tex]mass of O_{2} =\frac{240 grams of SO_{3}x 32 grams of O_{2} }{160.2grams of SO_{3}}[/tex]
mass of O₂= 47.94 grams
Given a 240.0 g sample of sulfur trioxide, 47.95 grams of oxygen are produced, assuming the decomposition goes to completion.
Learn more about the reaction stoichiometry:
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what is the name of the compoud H2Co2
I need help ASAP!!!!! What happens to water when it changes to ice?
- It's density increases
- mass increases
- volume increases
Hope this helps!
Answer:
first one
Explanation:
5. If all the particles in a material are made up of
several smaller particles, and every larger particle
is identical, is the material a pure substance or
not? Explain your reasoning.
Answer:
No. Because a pure substance, no matter if an element, compound, it can only contain one kind of particle .
Explanation:
The following are steps in the process of cloning a mouse. Arrange the steps in the correct order. (8.L.2.1) *
1. Stimulate cell division. 2. Implant the embryo into the surrogate mother. 3. Isolate donor cells 4. Transfer genetic material from donor to egg cell.
A. 4-2-3-1
B. 3-4-1-2
C. 3-2-4-1
D. 1-3-4-2
Answer:
C
Explanation:
I got A wrong so maybe
What conclusions can you make about the relationship between the volume of a gas and its pressure?
Answer:
[tex]V \alpha \frac{1}{P}[/tex]
Explanation:
According to Boyle's law, the volume of a given mass of gas is inversely proportional to its pressure at constant temperature.
This implies that, if the volume of a gas is halved, its pressure is doubled and vice versa.
This is mathematically represented as; [tex]V \alpha \frac{1}{P}[/tex] hence [tex]PV = K[/tex]. This is the mathematical statement of Boyle's law.
Because the rock is irregularly shaped, you used the
method to measure its volume.
Answer:Displacement method
Explanation:
Answer:
The first answer is: Because the rock is irregularly shaped, you used the displacement method to measure its volume.
The second answer is: You used calculations to indirectly find the density of the objects.
how many lbs are in 60 oz
Answer:
3 pounds 13 ounces
Explanation:
Math
Answer:
3.75
Explanation:
How many orbitals does the s subshell contain?
1
3
5
7
The correct answer to the question is that the s orbital contains only one subshell.
An orbital is a region in space where there is a high probability of finding an electron. The idea of orbital is an offshoot of the wave mechanical model of the atom.
The s orbital is spherically symmetrical. It contains only one subshell. Therefore, the correct answer to the question is that the s orbital contains only one subshell.
Learn more about orbital: https://brainly.com/question/18914648
Answer:
one orbital
Explanation:
Thus the s subshell has only one orbital, the p subshell has three orbitals, and so on