Answer : The balanced chemical reaction will be:
[tex]2H_2+O_2\rightarrow 2H_2O[/tex]
Explanation :
Balanced chemical reaction : It is defined as the reaction in which the number of atoms of individual elements present on reactant side must be equal to the product side.
If the amount of atoms of each type on the left and right sides of a reaction differs then to balance the equation by adding coefficient in the front of the elements or molecule or compound in the chemical equation.
The coefficient tell us about that how many molecules or atoms present in the chemical equation.
As per question, when 2 molecules of hydrogen gas and 1 molecule of oxygen gas react to yield 2 molecules of water.
The balanced chemical reaction will be:
[tex]2H_2+O_2\rightarrow 2H_2O[/tex]
Which of the following statements about the periodic table's organization is true? (Select all that apply.)
It is organized by reactivity.
It is organized by families.
It is organized by atomic number.
It is organized by atomic mass.
It is organized by periods and groups.
describe at least two changes the wax has undergone over time
Find and report the reduction potentials of lithium, sodium, and potassium.
The electrode potential values of [tex]{\text{L}}{{\text{i}}^ + }[/tex] ,[tex]{\text{N}}{{\text{a}}^ + }[/tex] and [tex]{{\text{K}}^ + }[/tex] are [tex]\boxed{ - 3.045{\text{ V}}}[/tex] , [tex]\boxed{ - {\text{2}}{\text{.714 V}}}[/tex] and [tex]\boxed{ - {\text{2}}{\text{.925 V}}}[/tex]respectively.
Further explanation:
Electrochemical cells are the devices that are used to generate an electric current from the energy released by the spontaneous redox reaction. Redox reactions involve the transfer of electrons between the chemical species by oxidation and reduction process. The oxidation process represents the loss of electrons and reduction process represents the gain of electrons.
In order to determine the standard reduction potential, the electrode is coupled with standard hydrogen electrode as illustrated in the attached image. The SHE acts as anode and the metal electrode acts as the cathode. The value of reduction potential for hydrogen has been assigned as 0.00 V.
The formula to calculate cell potential [tex]\left( {{E_{{\text{cell}}}}} \right)[/tex] of the reaction when the reduction occurs as cathode and oxidation occur at anode is as follows:
[tex]{E_{{\text{cell}}}} = {E_{{\text{cathode}}}} - {E_{{\text{anode}}}}[/tex]
The expression of Nernst equation that relates the reduction potential of a half or full electrochemical cell reaction to the standard electrode potential is given as,
[tex]{E_{{\text{cell}}}} = E_{{\text{cell}}}^\circ - \dfrac{{2.303RT}}{{nF}}\log \dfrac{{\left[ P \right]}}{{\left[ R \right]}}[/tex] ……. (1)
Here,
[tex]{E_{{\text{cell}}}}[/tex] is cell potential.
[tex]E_{{\text{cell}}}^\circ[/tex] is standard cell potential.
[tex]R[/tex] is gas constant and is equal to [tex]8.314{\text{ J/K}} \cdot {\text{mol}}[/tex].
[tex]T[/tex] is temperature.
[tex]n[/tex] denotes the number of moles of electrons transferred in the reaction.
[tex]F[/tex] is Faraday constant and is equal to [tex]95484.56{\text{ C/mol}}[/tex] .
[tex]\left[ P \right][/tex] is the concentration of product.
[tex]\left[ R \right][/tex] is the concentration of reactant.
At standard temperature [tex]25\;^\circ {\text{C}}\left( {298{\text{ K}}} \right)[/tex] the value of [tex]\dfrac{{2.303RT}}{F}[/tex] is equal to [tex]0.0592{\text{ V}}[/tex]. Thus the equation(1) is written as,
[tex]{E_{{\text{cell}}}} = E_{{\text{cell}}}^\circ - \dfrac{{0.0591}}{n}\log \dfrac{{\left[ P \right]}}{{\left[ R \right]}}[/tex] …… (2)
Knowing the concentration of the electrolyte solutions taken in the cathodic compartment and substituting the values in the Nernst equation gives the reduction potential for the half cell.
The electrode potential values of [tex]{\mathbf{L}}{{\mathbf{i}}^{\mathbf{ + }}}[/tex] ,[tex]{\mathbf{N}}{{\mathbf{a}}^{\mathbf{ + }}}[/tex] and [tex]{{\mathbf{K}}^{\mathbf{ + }}}[/tex] are [tex]{\mathbf{ - 3}}{\mathbf{.045 V}}[/tex], [tex]{\mathbf{ - 2}}{\mathbf{.714 V}}[/tex] and [tex]{\mathbf{ - 2}}{\mathbf{.925 V}}[/tex] respectively as determined with respect to standard hydrogen electrode at [tex]{\mathbf{298 K}}[/tex].
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Answer details:
Grade: Senior School
Subject: Chemistry
Chapter: Electrochemistry
Keywords: Electrochemical cells, Redox reactions, Oxidation, reduction, cell potential, half-cell, Nernst equation and Faraday constant.
The reduction potential describes the ease with which electrons are accepted by chemical species.
The term reduction potential is a measure of the ease with which a chemical specie accepts electrons and becomes "reduced". The more negative the reduction potential of a chemical specie, the more difficult it is for that chemical specie to accept electrons and become reduced.
The reduction potentials of lithium, sodium, and potassium are as follows;
Lithium = -3.04 VSodium = -2.71 VPotassium = -2.93 VLearn more: https://brainly.com/question/11969651
Is 2Na + Cl --> 2 NaCl a balanced chemical equation? Is it obeying the law of conservation of matter?
Question 4 options:
Yes it is balanced. It has the same number of Na and Cl on both the reactant side and the product side.
No it is not balanced. It has more Cl on the product side than the reactant side.
No it is not balanced it has more Na on the reactant side than the product side.
Answer : No it is not balanced. it has more Cl on the product side than the reactant side.
Explanation :
The given chemical equation is,
[tex]2Na+Cl\rightarrow 2NaCl[/tex]
But the net balanced chemical equation is,
[tex]2Na+Cl_2\rightarrow 2NaCl[/tex]
Law of conservation of matter : In a chemical reaction, the mass of products must be equal to the mass of reactants.
For Net balanced chemical equation:The mass of reactant side, 2Na + [tex]Cl_2[/tex] = 2(23) + 2(35.5) = 117
The mass of product side, 2NaCl = 2(23 + 35.5) = 117
This means, the mass of product is equal to the mass of reactant. The mass remains conserved.
For Given chemical equation:The mass of reactant side, 2Na + Cl = 2(23) + 35.5 = 81.5
The mass of product side, 2NaCl = 2(23 + 35.5) = 117
This means, the mass of product is not equal to the mass of reactant. The mass is not conserved.
How does heat transfer occur?
A. from warm objects to colder ones and vice versa
B. only from warm objects to colder ones
C. in many different directions
D. only from cold objects to warmer ones
List 3 properties of metalloids.
Metalloids are those elements which possess the characters of both metals and non-metals .
What do you mean by metalloids ?A metalloid is an element that has properties between metals and nonmetals. Metalloids can also be called semimetals.
Important use of metalloid is -:
Metalloids are useful in the semiconductor industry.
Properties of metalloids are -:
Metalloids are all solid at room temperature. They can form alloys with other metals. It is a much poorer conductor of heat and electricity than the metals.These mentioned properties describes about the properties of metalloids.
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5.which element has 2 more protons than nickel?
Answer:
The answer is Zinc
Explanation:
The number of protons is the atomic number. Looking a periodic table, you can see this atomic number for all elements.
Nickel has twenty-eight protons, so, their atomic number is twenty-eight.
Zinc has as atomic number thirty. so, Zinc has thirty protons. Two more than Nickel.
An object with a density of 1.7 g/ml will float in water
True or False
how do the leathery pads on the bottom of camel's feet help a camel? It is for a web quest thing
Potassium and sodium chloride are similar in charge and they both have the same anion. When comparing sodium chloride (36 g / 100 mL at 0 oC) and potassium chloride, which has a higher solubility at 0 oC?
How many days have passed if 4.80 mg of calcium-47 decayed to 1.2 mg of calcium-47?
The question refers to nuclear physics and can be interpreted using the concept of half-life. In the given scenario, three half-lives have passed in the decay of calcium-47 from 4.80 mg to 1.2 mg. Therefore, the time passed is three times the half-life of calcium-47.
Explanation:This question can be solved using the concept of half-life, which is widely used in nuclear physics and radioactive decay calculations. Since the half-life represents the time taken for half of a substance to decay, you can use the known half-life of Calcium-47, if provided, to figure out the time that has passed. Given we started with 4.80 mg and are left with 1.2 mg of Calcium-47 implies three half-lives have passed (as 4.80 mg to 2.4 mg is one half-life, 2.4 mg to 1.2 mg is a second half-life and finally 1.2 mg to 0.6 mg is the third half-life). Therefore, the time elapsed is equal to three times the half-life.
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How many grams of oxygen are formed when 8.20 moles of KOH are formed? 4 KO(s) + 2 H2O(l) → 4 KOH(s) + O2(g)
Answer : The mass of oxygen formed are 65.6 grams.
Explanation :
First we have to calculate the moles of [tex]O_2[/tex]
The given balance chemical reaction is:
[tex]4KO(s)+2H_2O(l)rightarrow 4KOH(s)+O_2(g)[/tex]
From the balanced chemical reaction we conclude that,
As, when 4 moles of KOH formed then 1 mole of [tex]O_2[/tex] will be formed
So, when 8.20 moles of KOH formed then [tex]\frac{8.20}{4}=2.05[/tex] mole of [tex]O_2[/tex] will be formed
Now we have to calculate the mass of [tex]O_2[/tex]
[tex]\text{ Mass of }O_2=\text{ Moles of }O_2\times \text{ Molar mass of }O_2[/tex]
Molar mass of [tex]O_2[/tex] = 32 g/mole
[tex]\text{ Mass of }O_2=(2.05moles)\times (32g/mole)=65.6g[/tex]
Therefore, the mass of oxygen formed are 65.6 grams.
The metal atoms in iron are held together by what
Which substances will make a salt when combined? Vinegar and antacids Soda and wine Soap and ammonia Fertilizer and detergent
Salt is usually formed during neutralization reactions, that is the reaction of an acid and a base. This is illustrated as follows:
HX + YOH --> XY + H2O
where XY is the salt
From the given choices, the only pair of acid and base is:
Vinegar and antacids
Answer is: vinegar and antacids.
Neutralizationis is reaction in which an acid (in this example vinegar or acetic acid CH₃COOH) and a base (in this example antacid, aluminium hydroxide, magnesium hydroxide or some other base) react quantitatively with each other.
Balanced chemical reaction of vinegar and antacid:
2CH₃COOH(aq) + Mg(OH)₂(aq) → (CH₃COO)₂Mg(s) + 2H₂O(l).
Magnesium acetate ((CH₃COO)₂Mg) is a salt.
How does the jet stream help move storms across North America?
how does a substances temperature change when the average kinetic energy of its particles increases and they decrease
What tool uses the genotypes of parents to predict the possibility of the phenotypes of the offspring? it is punnet square
What is the main role of a hormone?
To provide energy to the cells all over the body after release into the circulation
To carry information to cells in the body at different places from where it's released into the blood
To carry respiratory gases in the blood
To go out of and then into the nerve axon as part of the wave of excitation sending messages from one place to another
PLEASE NO INCORRECT ANSWERS
Answer is: To carry information to cells in the body at different places from where it's released into the blood.
Hormones are chemical messengers that travel through the blood and body fluids to organs and tissues to modify and control functions.
For example, estrogen and testosterone are hormones.
Testosterone is synthesized in several steps from cholesterol and is converted in the liver. It is the male sex hormone and an anabolic steroid.
Estrogen is synthesis in theca interna cells in the ovary, by the synthesis of androstenedione from cholesterol. It is the primary female sex hormone.
In science, Jill is learning about solids such as brass, bronze, and steel. How should she classify these materials?
C. Homogeneous mixtures These alloys are homogeneous mixtures because they have a uniform composition throughout.
Answer:
Homogeneous Mixture
Explanation:
How many atoms of phosphorus are in 5.40 mol of copper(II) phosphate?
Answer:
There are
4.09
×
10
24
atoms of phosphorus in
3.40 mol
copper(II) phosphate.
Explanation:
The formula unit for copper(II) phosphate is
Cu
3
(PO
4
)
2
. If the formula unit represents 1 mole of copper(II) phosphate , then there are 2 moles of phosphorus per 1 mole copper(II) phosphate formula units.
One mole of atoms =
6.022
×
10
23
atoms
.
During the process of answering this question, we will go from:
mol Cu
3
(PO
4
)
2
→
mol P
→
atoms P
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Mol Cu
3
(PO
4
)
2
to
Mol P
Multiply mol
Cu
3
(PO
4
)
2
by mol ratio between
P
and
Cu
3
(PO
4
)
2
, 2:1.
3.40
mol Cu
3
(PO
4
)
2
×
2
mol P
1
mol Cu
3
(PO
4
)
2
=
6.80 mol P
Mol P
→
Atoms P
Multiply mol
P
by
6.022
×
10
23
atoms/mol
.
6.8
mol P
×
6.022
×
10
23
atoms P
1
mol P
=
4.09
×
10
24
atoms P
rounded to three sig figs
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
You can put all the steps into one equation.
3.40
mol Cu
3
(PO
4
)
2
×
2
mol P
1
mol Cu
3
(PO
4
)
2
×
6.022
×
10
23
atoms P
1
mol P
=
4.09
×
10
24
atoms P
In 5.40 moles of copper(II) phosphate, there are 6.50 x 1024 atoms of phosphorus.
Explanation:The number of atoms in a certain amount of a substance can be determined using Avogadro's number, which is 6.022 x 1023 atoms/mole. First, we need to determine the mole ratio between phosphorus and copper(II) phosphate. The formula for copper(II) phosphate is Cu3(PO4)2, meaning each molecule contains two phosphorus atoms. Therefore, in 5.40 moles of copper(II) phosphate, there are 2 times 5.40, or 10.80 moles of phosphorus. To find the number of atoms, we multiply the number of moles by Avogadro's number: 10.80 moles x 6.022 x 1023 atoms/mole = 6.50 x 1024 phosphorus atoms.
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n ideal gas is stored in a container at constant volume. If the temperature (T) were increased to 3T, what would be the change in pressure (P)?
A. The pressure will remain unchanged.
B. The pressure will increase by 1.5P.
C. The pressure will decrease by 3P.
D. The pressure will increase by 3P.
Scientists have established that some of the layers of Earth are solid, some are liquid, and some are semi-fluid. Explain how the scientists are able to determine the liquid and solid layers. Use at least two pieces of evidence to support your answer.
Answer: Several studies has been made in order to understand the layers of the earth. Some of the evidences that proved the existence of solid and liquid layers are as follows-
According to the concept of Isostacy, the earth's crust is a like a solid wooden block, that floats over a vast liquid which is compared here with the mantle. Due to the variation in the crustal density, the crust sinks or gets uplifted.From the geophysical point of view, the study of the seismic waves made clear that the earth is comprised of three distinct layers such as the crust, mantle and the core. Crust refers to to top layer, mantle is the middle part and core is the interior part of the earth which is divided into two types, inner core (solid in nature) and outer core (liquid in nature).Which contribution added to Rutherford's discovery of a positive nucleus?
Atoms are indivisible.
Electrons are scattered in an atom.
Neutrons are inside the nucleus of an atom.
Atoms of the same element have the same properties.
C : " Neutrons are inside the nucleus of an atom" is the answer because, Rutherford theorized if the neutrons were in the center and the electrons were orbiting in separate energy levels the protons would be in the nucleus to keep the neutrons from floating. If the nucleus has neutral and positive particles, then it will be positive nucleus. Hope this helps
The discovery that added to Rutherford's discovery of a positive nucleus is neutrons are inside the nucleus of an atom.
Rutherford, through his ground breaking experiment with a thin gold foil was able to show that the nucleus is composed of a positively charged core called the nucleus.
In addition to this discovery, Chadwick in 1932 discovered the neutrons which are neutral particles but are also contained in the nucleus. They contribute to the mass of the atom.
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What does the law say about energy?
What about energy can change and what does not change, according to the law?
Final answer:
The Law of Conservation of Energy states that energy cannot be created or destroyed but can only change form. This law is fundamental to understanding the behavior of energy in various systems.
Explanation:
The question pertains to the basic laws that govern energy behavior in physics. The main law that defines what happens to energy is known as the Law of Conservation of Energy. This pivotal law asserts that energy cannot be created or destroyed, but can only change from one form to another.
For instance, electrical energy can be converted into thermal energy, kinetic energy can be transformed into potential energy, and so forth.
In a physical process, energy may seem to 'disappear' as it changes form, such as when friction converts kinetic energy into heat energy that is dispersed into the environment. However, the total energy before and after the process remains the same, affirming that energy is conserved.
Furthermore, looking at the broader perspective, the energy within a closed system remains constant over time. The only changes that occur are the forms of energy; for example, within an ecosystem, the chemical energy in food is converted into kinetic energy by animals, and ultimately into heat energy when it is used by organisms.
Ultimately, energy might leave the planet in the form of heat radiating into space, but overall, it stays within the Earth-sun system, converting and moving from one place to another.
what do animal cells need in order to maintain homeostasis A. light energy B. carbon dioxide C. chemical energy D.carbon monoxide
which kind of energy dose a stretched rubber band have
can someone plz help with This question thxs
Which of the following is a reasonable ground-state electron configuration?
a. 1s2 1p6 2s2 2p6 3s2
b. 1s2 2s2 2p6 3s2 3p6 4s2 4d8
c. 1s2 2s2 2p6 3p6
d. 1s1 2s2 2p6 3s1
Answer:
b) 1s2 2s2 2p6 3s2 3p6 4s2 4d8
Explanation:
Electron configuration of an atom is given based on the Aufbau principle which states that electrons are arranged in orbitals such that the lower energy orbitals are filled first. The increasing energy order of orbitals is:
1s < 2s < 2p < 3s < 3p < 4s < 3d < 4p....
s, p ,d orbitals can accommodate a maximum of 2,6 and 8 electrons respectively.
Based on the above ordering, the most reasonable ground state configuration would be:
1s2 2s2 2p6 3s2 3p6 4s2 4d8
Which low-energy state of condensed matter is characterized by structural rigidity and resistance to changes of shape or volume? gas liquid plasma solid
solid
extra charecters cuz i need them
Which of the following is a possible formula unit?
CaK2
BF3
Br2O
K2Cl
The answer is AlF3. Hopes this helps.
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Which picture shows straining
I think it's B F D
Which picture shows filter paper being used I think C
Which picture shows pieces of iron being separated I think E
Which picture show dissolving I think A which picture shows evaporation I think D CAN YOU CHECK IF IM RIGHT PLEASEWEEEEE I ONLY HAVE 8 minutes until the bus comesss sooo hurryyyrrrr
Answer:
Figure A depicts dissolution, B and F depict straining. Figure C depicts the use of filter paper. Figure D shows the evaporation process. Figure E shows separation with the help of a magnet.
Explanation:
The techniques mentioned in the images are separation techniques.
Straining is the separation process in which the particles are separated on the basis of size with the help of a filter. The filter will set the cut-off value and the particles are separated.
In Figure B with the help of a strainer, the water from the spaghetti is removed. So figure B possesses straining.
In figure F the tea leaves are separated from the tea with a strainer. Thus Figure F also depicts the straining technique.
The use of filter paper is made to differentiate the particles of very small size. In figure C, filter paper is used to separate the solute in the solution.
The separation of iron is made with the use of a magnet. Magnet has the ability to attract iron towards it.
In figure E, iron nails are being separated with the help of a magnet.
Dissolving is the process of making two solutes miscible in a solution. In figure A, sugar was made to dissolve in water making a miscible solution. Sand is allowed to dissolve in water making an immiscible solution.
Evaporation is the process of converting liquid to vapor form.
Figure D posses the evaporation process in which water is evaporated in the form of vapor, leaving the salt behind.
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