Determine the value of Kc for the following reaction if the equilibrium concentrations are as follows: [H2]eq = 0.14 M, [Br2]eq = 0.39 M, [HBr]eq = 1.6 M.
H2(g) + Br2(g) ⇌ 2 HBr(g)
Answers
The equilibrium constant (Kc) can be determined by using the concentrations of the species involved in the reaction at equilibrium. For the given reaction:
H2(g) + Br2(g) ⇌ 2 HBr(g)
The equilibrium constant expression is:
Kc = [HBr]eq² / ([H2]eq * [Br2]eq)
Substituting the given equilibrium concentrations:
Kc = (1.6 M)² / ((0.14 M) * (0.39 M))
Calculating the value:
Kc = 2.56 / 0.0546
Kc ≈ 46.98
Therefore, the value of Kc for the given reaction is approximately 46.98.
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Related Questions
Substance Density (grams/cm3)Chloroform - 1.5Ebony wood - 1.2Mahogany wood - 0.85Oil - 0.9Water - 1.023.Water, chloroform, and oil are poured into a container and form three layers. How are the fluids layered from top to bottom?Select one:a. Chloroform, water, oil.b. Oil, water, chloroform.c. Water, chloroform, oil.d. Water, oil, chloroform.
Answers
Answer
b. Oil, water, chloroform.
Explanation
Between water, chloroform, and oil, chloroform is the most dense substance (1.5 g/cm3), followed by water which has a density of 1.0 g/cm3. The least dense substance is oil with density of 0.9 g/cm3. Therefore, the oil will be at the top, followed by water, then chloroform will be at the bottom.
The fluids layered from top to bottom are oil, water and chloroform. Therefore, the correct option is option B.
A fluid is defined as a substance that has the ability to flow and conform to its surroundings. They can be found in both liquids and gases, among other forms. Liquids, like water, have a specified volume but no clear shape, whereas gases, like the air, have neither a specific volume nor shape. We need fluids to survive every day. Since water makes up the majority of the fluid in our bodies, they are essential for our survival. Fluids are also essential in many industrial processes, such as manufacturing, energy production, and transportation.
Therefore, the correct option is option B.
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MARKING BRAINLIEST!!
Students learned that the job of the nucleus of an animal cell is to control all of the cell's activities.
A. Which organ system has a similar function?
B. Respiratory system
C. Circulatory system
D. Nervous system
Muscular system
Answers
of those listed, the most significant role for nitrogen in the atmosphere is to
Answers
Of those listed, the most significant role for nitrogen in the atmosphere is to act as a major component of the air we breathe.
Most nitrogen enters ecosystems via certain kinds of bacteria in soil and plant roots that convert nitrogen gas into ammonia (NH3). This process is called nitrogen fixation. A very small amount of nitrogen is fixed via lightning interacting with the air. Nitrogen makes up about 78% of Earth's atmosphere and is essential for the survival of many living organisms, including humans. Additionally, nitrogen is involved in the cycling of nutrients in ecosystems and plays a critical role in the growth and development of plants.
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Elemental bromine reacts vigorously with elemental sodium metal to form a white solid. Does this characteristic of elemental bromine represent a physical or a chemical property?
Answers
The characteristic of elemental bromine reacting vigorously with elemental sodium metal to form a white solid represents a chemical property.
Chemical characteristics define how substances react or change chemically. A white solid forms when elemental bromine and sodium metal combine, suggesting a chemical transition.
However, a substance's physical attributes can be detected or quantified without changing its chemical composition. Colour, density, melting, and boiling points are physical qualities.
It is a chemical property of elemental bromine to react with sodium metal and generate a new compound.
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24. Explain why memberwise assignment can cause problems with a class that contains a pointer member.
Answers
Memberwise assignment can cause problems with a class that contains a pointer member because it can lead to shallow copying and memory management issues. When memberwise assignment occurs, each member of the source object is copied directly to the target object. In the case of a pointer member, only the pointer's address is copied, not the memory it points to.
Memberwise assignment refers to the process of copying the values of one object's members into another object's members. This process can cause problems with a class that contains a pointer member because when memberwise assignment occurs, the pointer is copied but not the memory it points to. This can result in two objects pointing to the same memory location, which can lead to unexpected behavior if changes are made to the memory through one object's pointer. Additionally, if one object is deleted or goes out of scope, the memory pointed to by its pointer member will also be deleted, leaving the other object's pointer pointing to invalid memory. To avoid these problems, it is recommended to implement a copy constructor and/or copy assignment operator that properly handles the pointer member, such as creating a deep copy of the pointed-to memory rather than simply copying the pointer itself.
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3. DNA replication occurs:
a. During cell division
b. Continuously
C. Before cell division
d. Only once in the life of the organism
e. Only in gametes
Answers
Answer:
b
Explanation:
A system of ideas that explains many related observations and is supported by a large body of evidence collected through scientific investigation is considered a
Answers
Answer:
Theory
Explanation:
Science is empirical in nature. It massively depends on the gathering of a large body of evidence to support one's idea.
In the scientific method, observations are subjected to rigorous experimentation until a large data of empirical evidences support such idea.
When such idea has been supported by massive empirical evidence, we now call it a theory.
PLEASE I NEED HELP! Which postulate of Dalton's atomic model was later changed and why?
Answers
In Dalton Theory the atom of the same element has same mass found also wrong because some elements show different atoms having different masses.
Why postulate of Dalton's atomic model was later changed?That postulate of the Dalton atomic theory was changed that atom is indivisible particle and can be subdivided into smaller particles was later changed and then this statement comes forward that because the atoms can be divided into three more particles which are electron, proton and neutron.
1. The first statement of the Dalton's theory got wrong because due to the indivisibility of the atom.
2. The atom is the smallest particle also found wrong because the atom is further divided in the proton, electron and neutron.
3. The atom of the same element has same mass found also wrong because some elements show different atoms having different masses.
So we can conclude that in Dalton theory the atom of the same element has same mass found also wrong because some elements show different atoms having different masses.
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calculate the composition, in weight percent, of an alloy that contains 105 kg of iron, 0.2 kg of carbon, and 1.0 kg of chromium.
Answers
The mass percentage of carbon in weight percent, of an alloy that contains 105 kg of iron, 0.2 kg of carbon, and 1.0 kg of chromium is 0.016.
The mass percent formula for each element is: Typically, mass is measured in grammes. Mass percent is sometimes known as weight percentage or w/w%. The molar mass is the sum of all the atom masses in one mole of the substance. The total of all mass percentages should equal 100%. The masses included in the equations above must all be stated in grammes, and each component's chemical formula needs to be expressed as the secondary units on its corresponding numerical amount. Therefore, if a different unit is used to indicate the quantity of a solute, solvent, and solution
mass percentage of C= 0.2 /12 = 0.016
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You're paid $25 per hour for your job. How much would you earn in cents per second?
Answers
Answer:
0.694 cents per second
Explanation:
25x100=2500 cents per hour, 2500/60 = 41.67 per minute and 41.67/60=0.694 cents per second
Describe two ways the material in this lesson illustrates the importance of creativity in scientific investigation
Answers
Answer:
Dalton used creativity to modify Proust's experiment and interpret the results. Millikan used creativity to develop a way to measure the charge on an electron. Thomson used creativity to interpret the results of the cathode ray tube experiment.
Explanation:
Creativity enables scientists to devise new ways of solving old problems.
I do not know what your material contains, however, creativity is key in scientific investigation. The term "science" is coined from the Latin word "scientia" which means knowledge.
In science, we endeavor to create new knowledge through research and innovation. This requires that a scientist must think of new and efficient ways of solving old problems. This underscores the centrality of creativity in scientific investigation.
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Using an analogy of a water balloon, describe the function of the bladder.
Answers
Answer:
A bladder is like a balloon, because it holds urine, just like a balloon holds air. The urethra's function is to excrete urine from the human body.
Explanation:
A bladder and a balloon are similar, because it is the bladder which clasp urine, whereas a balloon clench air. The role of urethra is to eliminate urine from our human body.
What is bladder?The hollow organ which is in triangle shape and found in the lower abdomen just like a balloon is defined as the bladder. The urinary bladder is also known as a temporary reservoir of urine. Urine is reserved in the urinary bladder till it is removed out through the urethra.
As a result of the contraction of the wall of the urinary bladder, urine is eliminated from the body from time to time. The urine contains waste and extra fluid left over the body which has to be eliminated.
The bladder resembles the water balloon in that it holds urine in the similar way as the water balloon clench water. The water balloon pops when the amount of water exceeds than it can hold.
Thus the function of bladder and water balloon are found to be same.
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Which is a positive effect of using chemistry?
O The synthesis of drugs to disease may increase adverse reactions in others.
O The use of herbicides to increase resistance in tolerant plants.
O Fertilizer runoff from farms into natural waters will purify water systems.
O Energy can be generated without burning fossil fuels.
Answers
The positive effect of using chemistry is the generation of energy without fossil fuels.
Chemistry is the branch of science that deals with the study of the nature, properties and composition of matter as well as the changes that matter undergoes. Chemistry has really contributed positively to the advancement of the society.
Lately, there has been a lot of emphasis on alternative sources of energy apart from fossil fuels. One such options is the use of hydrogen fuels. Chemistry has been at the forefront of this research.
Hence, one positive effect of using chemistry is that energy can be generated without burning fossil fuels.
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Answer:
its D.
Explanation:
A certain polyatomic ion contains 49 protons and 50 electrons. What's the net charge of this ion?Question options:A) +1B) +2C) –1D) –2
Answers
Explanation:
We have to find the net charge of a polyatomic ion that contains 49 protons and 50 electrons.
n° of protons = 49 n° of electrons = 50
The charge of each electron is -1 and the charge of each proton is +1.
charge of electron = -1 charge of proton = +1
Finally the net charge will be:
Net charge = n° of electrons * charge of electron + n° of protons * charge of proton
Net charge = 50 * (-1) + 49 * (+1)
Net charge = -1
Answer: C) -1
how can we calculate the energy efficiency of the fuel cell is it through 1) the electrical energy divided by the chemical energy , or 2) the energy output divided by energy input, and what does the (energy input) mean if the redox reaction occurs spontaneous?
Answers
The energy efficiency of a fuel cell can be calculated by dividing the electrical energy output by the energy input. In a fuel cell, the energy input refers to the chemical energy stored in the fuel that is converted to electrical energy through a redox reaction.
This redox reaction is spontaneous, meaning that it releases energy when it occurs. Therefore, energy input is calculated by measuring the heat released by the reaction, which is proportional to the chemical energy of fuel. The energy output is determined by measuring the electrical energy produced by fuel cell. The energy efficiency is expressed as percentage, where the higher the percentage, more efficient the fuel cell is in converting chemical energy to electrical energy.
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balancing chemical equations!
need help!!!
don’t mind how i wrote it.
Answers
Answer:
2 KCIO₃ → 2 KCI + 3 O₂
Explanation:
A chemical equation is balanced when the number of atoms of each element is equal on both sides of the equation.
You have already identified the initial number of atoms of each element on both sides of the equation. As a rule of thumb, we balance the number of oxygen and hydrogen atoms last.
However, since all the other elements are already balanced, we shall start by balancing the number of oxygen atoms.
The lowest common multiple of 2 and 3 is 6. Thus, we shall ensure that both sides of the equation has 6 oxygen atoms.
2 KCIO₃ → KCI + 3 O₂
Reactants
K --- 2
C--- 2
I --- 2
O --- 6
Products
K --- 1
C --- 1
I --- 1
O --- 6
Notice that number of K, C and I atoms on the left-hand side of the equation has also changed.
2 KCIO₃ → 2 KCI + 3 O₂
Reactants
K --- 2
C --- 2
I --- 2
O --- 6
Products
K --- 2
C --- 2
I --- 2
O --- 6
The equation is now balanced.
if a resting axon increases its permeability to sodium ions:____
Answers
If a resting axon increases its permeability to sodium ions, it will undergo depolarization.
The resting membrane potential of a neuron is maintained by the unequal distribution of ions across the cell membrane. At rest, the axon has a negative charge inside compared to the outside, primarily due to the higher concentration of sodium ions outside the cell and higher concentration of potassium ions inside the cell.
When the permeability of the axon membrane to sodium ions increases, more sodium ions can flow into the cell. This influx of positively charged sodium ions depolarizes the cell membrane, reducing the electrical potential difference across the membrane. As a result, the inside of the axon becomes less negative.
This increase in sodium permeability can be due to various factors such as the opening of voltage-gated sodium channels or the binding of specific molecules that increase sodium permeability. Depolarization plays a crucial role in initiating and propagating action potentials along the axon, allowing for the transmission of electrical signals in the nervous system.
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What isotope remains after the alpha decay of polonium-212.
Answers
Polonium - 212 when goes through alpha radiation or alpha emission it gives isotope lead - 206 has atomic number 82.
What is isotope ?Isotopes are members of a family of an element that all have the exactly same number of protons but they contain different numbers of neutrons in there structure. The number of protons in a nucleus verify the element's atomic number of the molecule.
Elements having same atomic number but they are differ in mass number are called as isotopes . There are many isotopes present in periodic table. Atomic number is denoted by Z while mass number is denoted by M.
for example ; Carbon have different isotope i.e. C₁₂,C₁₃,C₁₄
Thus , lead - 206 which having atomic number 82 is isotope remains after the decay of alpha radiation of polonium - 212.
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Which factor would be most likely to shrink the size of an atom’s electron cloud?
A. Forming a positive ion.
B. Removing a proton.
C. Adding an energy level.
D. Adding a valence electron to an existing energy level.
Answers
Answer:
A. Forming a positive ion!
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if a 348 g sample of water (Cp= 2.06 J/g°C) at 127 °C is cooled to 103 "C, find the change in enthalpy of the system
Answers
The enthalpy of reaction once you have m, the mass of your reactants, s, the specific heat of your product, and T, the temperature change from your reaction.
How do you find the change in enthalpy of a system?The enthalpy of reaction once you have m, the mass of your reactants, s, the specific heat of your product, and T, the temperature change from your reaction. To solve, simply enter your values into the formula Δ H = m x s x ΔT and multiply. At constant pressure, enthalpy is a state function whose change indicates the amount of heat transferred from a system to its surroundings. The change in a system's internal energy is the sum of the heat transferred and the work done.Therefore,
Weight water = 348 g
Specific Heat capacity Cp = 2.06 J/g °c
Temperature change ΔT = 127 -103 = 24
Change in enthalpy of the System ΔH = m Cp ΔT
= 348 x 2.06 x 24= 17205.12 J.
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liquids separate into layers during an extraction/while using a separatory funnel based upon...
Answers
Liquids separate into layers during an extraction/while using a separatory funnel based upon their densities.
The Separatory funnel is used to divide two immiscible liquids, or liquids that are incapable of mixing or dissolving with one another.
When two immiscible liquids are introduced into a separatory funnel and left undisturbed, they will form two distinct layers based on their respective densities.
What is a separatory funnel and how does it work?
The separatory funnel is a laboratory glassware that is used for separating two immiscible liquids with different densities.
It is made up of a conical shape glass container with a tap and stopper. One of the liquids is added to the separatory funnel, and the other is added on top.
The tap is then opened, and the bottom layer is released.
The tap is then closed, and the top layer is poured into another container.
The principle of separating funnel is based upon the difference in the densities of the two immiscible liquids.
When two immiscible liquids, one denser than the other are placed in a separating funnel and allowed to stand undisturbed for some time, the liquids will form two distinct layers.
The denser liquid forms the lower layer while the less dense liquid forms the upper layer.
When the tap of the separating funnel is opened, the denser liquid will flow out first, followed by the less dense liquid.
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The number of moles of Cl - ions needed to combine completely with 0.25 mole of Mg 2 ions is: 0.125 0.75 0.25 0.50
Answers
Answer:
The answer is 0.50
Explanation:
What is true about a neutral atom? *
a. The number of electrons and protons are always the same.
b. The number of neutrons is always the same as the number of electrons.
c. The number of protons may change.
d. The mass number can be found by knowing the number of electrons.
e. The mass number can be found by knowing the number of neutrons of the atom.
Answers
Please help!
True or false? Strong acids such as nitric acid ionise completely when dissolved in water.
Answers
How are archaeological finds dated?
Answers
Explanation:
Archaeologists use that assumption, called the law of superposition, to help determine a relative chronology for the site itself. Then, they use contextual clues and absolute dating techniques to help point to the age of the artifacts found in each layer.
Answer:
Radiotherapy
Explanation:
If some solid sodium solid hydroxide is added to a solution that is 0.010–molar in (CH3)3CCl and 0.10–molar in NaOH, which of the following is true? (Assume the temperature and volume remain constant.)answer choicesa. Both the reaction rate and k increase.b. Both the reaction rate and k decrease.c. Both the reaction rate and k remain the same.d. The reaction rate increases but k remains the same.e. The reaction rate decreases but k remains the same.
Answers
If some solid sodium hydroxide is added to a solution that is 0.010–molar in (CH₃)₃CCl and 0.10–molar in NaOH, the reaction rate increases but k remains the same. Therefore, option D is correct.
In this scenario, when solid sodium hydroxide (NaOH) is added to a solution containing (CH₃)₃CCl and NaOH, a reaction between (CH₃)₃CCl and NaOH takes place. The balanced chemical equation for this reaction is:
(CH₃)₃CCl + NaOH ⇒ (CH₃)₃COH + NaCl
The reaction rate is determined by the concentration of the reactants. In this case, the concentration of (CH₃)₃CCl remains constant because only solid NaOH is added.
The rate constant depends on the specific reaction and the conditions under which it occurs. Since the temperature and volume remain constant, the rate constant (k) will also remain constant.
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What is an oxidizing agent ?
Answers
Answer:
A substance that tends to bring about oxidation by being reduced and gaining electrons
Explanation:
Answer:
An oxidizing agent is a substance that takes negatively charged electrons "away" from a substance or object; usually taking these electrons for itself it can also transport the electrons from an object and "give" them to another substance or object. The object that has been oxidized will then have a positive charge after losing the negative electrons and the substance receiving the electrons will become negative.
Explanation:
Examples include halogens, potassium nitrate, and nitric acid.
Are two atoms of the same element identical?
Answers
Answer:
No they are not identical.
Explanation:
They are not identical because there are many ranges of states that the electrons could have.
I hope it helps! Have a great day!
Muffin ^^
Answer:
No.
Explanation:
It could vary so it wouldn’t be identical.
I hope it helps! Have a great day!
bren~
A _____ state is when the electron is closest to the nucleus.
Answers
Answer:
ground state
Explanation:
A ground state is when the electron is closest to the nucleus.
What is the ground state of an atom?The ground state of an electron is the state of the lowest energy for that electron. The nucleus is surrounded by electrons that occupy orbitals of varying energy levels.
When an electron jumps to an energy state greater than its ground state, then it is in an excited state. An electron can become excited from the ground state to the excited state if it is given extra energy in the form of a photon, or packet of light.
An electron occupies the lowest energy level that is closer to the nucleus when the electron is present in the ground state.
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Physical properties are used to classify and compare substances. Physical
properties can include density, thermal conductivity, electrical conductivity,
solubility, magnetism, melting point, and boiling point. Which statement is
correct about all of these physical properties?
They involve a change in the state of matter.
They involve the production of new substances.
They can be measured only after a change in state.
They are independent of the amount of the sample present.
Answers
Answer:
Physical properties involve a change in the state of matter.
Explanation:
A chemical change would change the chemical composition.
A physical change would change the state of matter, for example solid to liquid to gas are changes in state. So, this means when water changes states of matter it is a physical change.