The hydronium ion concentration [H₃O⁺]=7.826 x 10⁻⁶
Further explanationIn general, the weak acid ionization reaction
HA (aq) ---> H⁺ (aq) + A⁻ (aq)
Ka's value
[tex]\large {\boxed {\bold {Ka \: = \: \frac {[H ^ +] [A ^ -]} {[HA]}}}}[/tex]
Reaction
HCN(aq) + H₂O(l) ⇌ H₃O⁺(aq) + CN⁻ (aq)
0.125
x x x
0.125-x x x
[tex]\tt Ka=\dfrac{[H_3O^+][CN^-]}{[HCN^-]}[/tex]
[tex]\tt 4.9\times 10^{-10}=\dfrac{x^2}{0.125-x}\approx \dfrac{x^2}{0.125}\\\\x^2=6.125\times 10^{-11}\\\\x=7.826\times 10^{-6}[/tex]
what feature has disneyland's management added to lengthen the visitor's stay
Answer:
where are the options?
Explanation:
What is the purpose of a catalyst?
O A. To change the potential energy of the reactants
O B. To lower the activation energy of a reaction
O C. To increase the kinetic energy of the reactants
O D. To shift the equilibrium position of a reaction
Answer:
To lower the activation energy of a reaction
Explanation:
i just took the test and got it right ...... i hope this helps :)
4. Which of the following is the most stable isotope?
Polonium-210
Uranium-237
Francium-227
Plutonium-238
Half-life
(hr)
3,310
162
0.04
768,000
A. Polonium-210
B. Uranium-237
C. Francium-227
D. Plutonium-238
Answer: D. Plutonium-238 is the most stable isotope
Explanation:
Radioactivity is the process of unstable isotopes to stable isotopes by decay, by emitting certain particles (such as alpha (α), beta (β), gamma (γ) particles)
General formulas used in decay:
T = duration of decay
t 1/2 = half-life
N₀ = the number of initial radioactive atoms
Nt = the number of radioactive atoms left after decaying during T time
Half-life shows the time it takes for an atom to get half of its initial mass (to decay to half of its initial mass)
The longer the half-life indicates the stability of the atom
Half-life (hr) of isotopes :
Polonium-210 : 3,310
Uranium-237 : 162
Francium-227 : 0.04
Plutonium-238 : 768,000
The half-life value above shows that Plutonium-238 has the longest time, making it the most stable
The longer the half life of an isotope higher will be its stability. Here, among the given isotopes, plutonium - 238 has the greater half life. Hence it is the mist stable one.
What is half life ?Heavy unstable radioactive isotopes undergoes nuclear decay through the emission of charged particles such as alpha or beta. The unstable isotopes then converts to other stable nuclei or to isotopes with more half life.
Half life of a radioactive isotope is the time required to decay the half of initial amount of the isotope. It is inversely proportional to the decay constant of the nuclear decay.
Among the given isotopes, Pu-238 has the longer half life time. Longer half time means more time to get decayed by half then more stability. Thus, Pu-238 is the most stable one.
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Item 3
Which part of the cell contains the genetic instructions and information?
pores
nucleus
cell wall
plasma membrane
Answer: B.
Explanation:
The nucleus is a membrane-enclosed organelle found in most eukaryotic cells. The nucleus is the largest organelle in the cell and contains most of the cell's genetic information (mitochondria also contain DNA, called mitochondrial DNA, but it makes up just a small percentage of the cell's overall DNA content).
Hope this helps!
Answer:
nuke-leus
Explanation:
What volume of hydrogen is formed when 3.00 g of
magnesium react with an excess of dilute sulfuric acid is
carried out under room temperature and pressure at 1 atm.
Answer:
Volume of hydrogen gas formed = 3.1 L
Explanation:
Given data:
Mass of magnesium = 3.00 g
Temperature = room = 27°C (27+273 = 300 K)
Pressure = 1 atm
Volume of hydrogen gas formed = ?
Solution:
Chemical equation:
Mg + H₂SO₄ → MgSO₄ + H₂
Number of moles of Mg:
Number of moles = mass/molar mass
Number of moles = 3.00 g/ 24 g/mol
Number of moles = 0.125 mol
Now we will compare the moles Mg with hydrogen.
Mg : H₂
1 : 1
0.125 : 0.125
Volume of hydrogen:
PV = nRT
1 atm × V = 0.125 mol × 0.0821 atm.L /K.mol × 300 k
V = 3.1atm.L/1 atm
V = 3.1 L
If a solid has a density greater than 1 g/ml will it sink or float?
Answer:
if an object weighs more than an equal volume of water, it is more dense and will sink, and if it weighs less than an equal volume of water, it is less dense and will float. Remember that the density of water is about 1 g/cm3.
What mass of NH4NO3 would you need to make 250.0mL of a 0.78M solution?
A) 0.20 g
B) 13g
C) 16g
D)2.5x102g
Answer:
a
Explanation:
How many valence electrons would be used in drawing the Lewis Structure CF4?
Answer:
32
Explanation:
You have 7 valance electrons in fluorine, and you have 4 of them. 7*4=28. Then, you have 4 valance electrons on carbon. So 28+4=32
If you change a substance into a new substance
Answer:
Explanation: Chemical changes cause a substance to change into an entirely substance with a new chemical formula. And chemical changes are also known as chemical reaction.
What is an individual living entity called?
tissue
cell
organism
organ
Answer:
it is organism the third one
The image below shows uncharged particles bouncing around.
State of Matter
Which state of matter is most likely represented in the image? (5 points)
Gas
Solid
Liquid
Plasma
This problem is providing information about the states of matter and a given diagram showing a molecular arrangement it has. Thus, we can start off by analyzing the attached file, which shows molecular arrangements and movements each state exhibits.
Solids are quite organized so that they are able to form molecular networks in which molecules vibrate but do not displace anywhere. Liquid molecules are close enough to have small movements and vibrations but are not able to form any organized network.
Gases, however, exhibit no molecular organization but large movements inside the container whose walls the gas constantly crash against. Plasma do not have any order neither yet it contains ions.
In such a way, since the given diagram do not have any apparent order or ion, we infer this is about a gas that moves into the container and crash against its walls.
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https://brainly.com/question/18538345https://brainly.com/question/9402776What is the end
result of a chemical reaction?
Chemical reactions occur when chemical bonds between atoms are formed or broken. The substances that go into a chemical reaction are called the reactants, and the substances produced at the end of the reaction are known as the products.
The end of a chemical reaction is the product.
What is a chemical reaction?
A chemical reaction contains a reactant that reacts to form products. The reactant can be more than two, and the product can be two or more.
Food spoiling is a chemical reaction because it has an unpleasant odor, taste, and color change. Fruits undergo a chemical shift as they ripen. For instance, both the texture and color may change.
When we balance a chemical process, the number of moles or atoms on the left must match the amount on the right. Thus, the atoms participating in such a chemical process are discovered to have mass.
Chemical elements are uncontaminated by impurities or other elements and are pure substances made up of just one type of atom. They are found in the crust of the earth. Carbon, hydrogen, and oxygen are some examples.
Therefore, the end is the product.
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Which of the following is NOT a
physical property?
A melting point
B state of matter
C density
D flammability
Which of the following would be a warning sign that information about a weight loss medication is not reliable science?
Answer: The correct answer is B.
Explanation: The scientists and all test subjects involved in the investigation work for the company that sells the medication and science product or similar is only considered as reliable if it has been tested following the scientific method and if there are not interests that can affect the process.
Consider an isolated system (no heat, matter, work exchange with the environment) consisting of three internal compartments: A on the left, B in the center, and C on the right.Initially the central volume B is filled with an ideal gas at 298K andtheothertwo are empty. Consider the following two processes:a.The valve to the A side is opened, the gas expands freely into compartment A, and the system comesto equilibrium. Then, the valve to the C compartment is opened, and the system comes to equilibrium. b.Both valves are opened simultaneously, the gas expands freely into both compartments, and the system comes to its equilibrium. Which process produces more entropy
Answer:
Both processes produce equal entropy
Explanation:
Three compartments : A , B , C
A to the left, B in center, C on the right
compartment B is filled at 298 k while A and C is empty
The process that produces more entropy is: both processes and this is because the system is an isolated system with no heat matter and work exchange with the environment. and also entropy is independent of the path a process follows so either valve been open does not affect the entropy in the system because the change in the internal energy of an isolated system = 0
What are some factors that affect weather?
A. altitude, topography, and latitude
B. atm pressure, wind, and temp
C. visibility, altitude, and geography
The diagram shows structures that represent different levels of organization in a human. Which is the simplest level of organization?
W
X
Y
Z
Answer: the answer is Z
Explanation:
Becuase the order from smallest to largest would be:
Y: Cell
Z: Tissue
W: Organ
X: Organ system
the sun has the same diameter as jupiter?
What ionic substance is being used to illustrate the concept of lattice energy in Model 1?
Answer:
magnesium oxide
Explanation:
hope this helps
7. A cyclist starting from rest accelerates at a rate of 6 m/s until she reaches 30 m/s. How long
does it take her to accelerate?
Answer:
Explanation:
The given values are:
a= 6m/s²
u= 0 m/s
v = 30 m/s
t= ?
The formula is :
[tex]a=\frac{v-u}{t}[/tex]
thus,
[tex]t=\frac{v-u}{a}\\t=\frac{30-0}{6}\\t= 5 seconds[/tex]
What is the density if the mass is 25 g and the volume is 114 mL?
Answer:
0.219 g/mL.
Explanation:
From the question given above, the following data were obtained:
Mass = 25 g
Volume = 114 mL
Density =.....?
Density of a substance is simply defined as the mass of the substance per unit volume of the substance. Mathematically, it is expressed as:
Density = mass /volume
With the above formula, we can obtain the density of the substance given in the question above as follow:
Mass = 25 g
Volume = 114 mL
Density =.....?
Density = mass /volume
Density = 25/114
Density = 0.219 g/mL
Therefore, the density of the substance is 0.219 g/mL
You have three mugs of tea:
a. Is a small mug. It is 100°F
b. Is a large mug. It is 120°F
c. Is a small mug. It is 120°F
Put these mugs in order. Start with the mug with the SMALLEST amount of thermal energy first and end with the mug with the LARGEST amount of thermal energy.
__2__ C. is a small mug. It is 120°F
__3__ A. is a small mug. It is 100°F
__1__ B. is a large mug. It is 120°F
Answer:
ACB
Explanation:
Thermal energy is the average sum of all kinetic energy of all the molecules of gases. The correct order of mug in decreasing thermal energy is C>A>B.
What is Thermal energy?
Thermal energy is a energy which is possess by a moving object. It is directly proportional to kinetic energy of the molecules. It is very difficult to find the correct value of kinetic energy so we find average kinetic energy. Which is very easy to calculate as compared to calculating kinetic energy. Average kinetic energy is directly proportional to temperature. It is not dependent on the type of gases or mass of gases.
Mathematically,
K.E=2/3KT
Where,
K= Boltzmann constant
T is the temperature
Between A and C whose volume is same, 120°F is the highest temperature so, C will have high thermal energy than A. C will have lowest thermal energy as it has volume larger than that of A and C.
Therefore, the correct order of mug in decreasing thermal energy is C>A>B.
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How many C atoms are there in a sample of C,H, that contains 6.59 x 1026 H atoms?
A. 1.98 x 1027 C atoms
B. 2.47 x 1026 C atoms
C. 4.94 x 1026 C atoms
D. 3.17 x 1024 C atoms
Answer:
bill gates
Explanation:
Fluorine has seven electrons in its outermost shell. It will most likely try to join with an atom with _____.
seven electrons in its outermost shell
two electrons in its outermost shell
one electron in its outermost shell
eight electrons in its first shell
Answer:
Its either with itself to become fluoride Fl2 or with an alkali metal (elements in group 1) to achieve a stable electronic configuration or octet structure
Explanation:
A Geiger counter used in several applications over the course of a typical day produces on the average 100 counts per second. The tube is in the form of a cylinder 5 cm in diameter by 20 cm long and is filled with a mixture of 90% argon and 10% ethanol to a pressure of 0.1 atmosphere. In the Geiger-Muller region, each output count results from the formation of about 1010 ion-electron pairs. How long will it take for one-third of the quenching gas to be used up, thus necessitating replacement of the tube
Answer:
As it is given that
[tex]activity=\lambda= 100\\[/tex]
[tex]Number~of ~counts=100/second\\[/tex]
Using formula
[tex]ln(\frac{N}{N_o})=-\lambda\cdot t\\\\[/tex]
or
[tex]-\frac{ln(\frac{N}{N_o})}{\lambda}= t\\\\[/tex]
where [tex]N=\frac{N_o}{3}[/tex]
[tex]-\frac{ln(\frac{1}{3})}{100}= t\\\\\-\frac{-1.0986}{100}=t\\\\[/tex]
[tex]\frac{1.0986}{100}=t\\1.0986\cdot 10^{-2}seconds=t\\[/tex]
DONT DO A RANDOM ANSWER OR ILL REPORT, ILL GIVE BRAINLIEST AND ALOT OF POINTS IF YOU SAY THE CORRECT ONE!! students who enjoy completing worksheets with specific directions are likely to be what kind of thinkers?
Cl2 is a stable diatomic molecule. It can be decomposed to form two Cl atoms as
shown below.
Cl2 → 2Cl(9)
Predict the change in enthalpy (AH) of this reaction.
A) AH is (-); endothermic
B) AH is (+); endothermic
C) AH is (-); exothermic
D) AH is (+); exothermic
E) AH = 0; thermoneutral
Answer:
Option B: ΔH is (+); endothermic
Explanation:
From the reaction Cl2 → 2Cl(g) given, we can see that the number of moles on the left hand side is 1 while on right hand side, it is 2. This means the number of moles are increasing and it means that the randomness of the system has increased. Also, the bonds are being broken down.
Therefore, the reaction is endothermic. In endothermic reactions, ΔH is positive.
Thus, the correct option is option B.
Answer:
b
Explanation:
ah
A certain shade of blue has a frequency of 7.08×1014 Hz. What is the energy of exactly one photon of this light? Planck's constant ℎ=6.626×10−34 J⋅s.
Answer:
We have the final answer as
[tex]4.69 \times {10}^{ - 19} \: \: J[/tex]
Explanation:
To find the energy of a photon of this light we use the formula
E = hfwhere
E is the energy
f is the frequency
h is the Planck's constant which is
6.626 × 10-³⁴ Js
From the question
f = 7.08×10¹⁴ Hz
We have
E = 7.08×10¹⁴ × 6.626 × 10-³⁴
We have the final answer as
[tex]4.69 \times {10}^{ - 19} \: \: J[/tex]
Hope this helps you
Is a nickel coin magnetic
Answer:
Yes
Explanation:
Because it was false because it has been the substance abuse permalink
In this lesson, you learned about the properties that distinguish one element from another.
In this assignment, you will describe elements, isotopes, and ions.
