Based on the half-life of the radioactive sample and the properties of nuclear reactions, the correct options are:
option Aoption Coption Coption Doption Boption A.option C.option CWhat is half-life?Half-life is the time taken for half the amount of atoms in an a radioactive element to decay.
1. After three half-lives, (1/2)³ of the original amount will remain = 1/8
1/8 of 16 = 2 ; option A
2. The balanced nuclear equation is given below:
action below:
/64 → /62 + 4He 2 ; option C
3. The trend of proton-to-neutron ratio as elements become heavier is that heavier elements have a greater amount of neutrons per proton; option C
4. The loss in mass of a compound composed of multiple atom types than those of the individual atoms they are made of is due to energy stored in the bonds in the nucleus known as the binding energy; option D
5. Initially, 12 g of carbon-14 was present
After one half-life, 6 g of carbon-14 remained, and 6 g of carbon-12 was present.
After two half-lives, 3 g of carbon-14 remained, and 9 grams of carbon-12 was present.
Age of the carbon sample = 5730 * 2 = 11460 years; option B
6. A major argument against nuclear power plants is that they produce radioactive waste materials; option A.
7. A common source of radiation that humans are exposed to come from outer space in the form of ultraviolet rays; option C.
8. The balanced nuclear reaction is:
/92+/0 → /36+ 1/0 + 143Ba 56 ; option C
In conclusion, nuclear reaction results in changes in the nucleus of atoms.
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Consider these steps involved in bacterial reproduction.
X: Cell wall and membrane divide and separate.
Y: Genetic material is replicated.
Z: Two independent cells form.
Which list shows the correct order of steps of when a single cell reproduces?
X → Y → Z
Z → X → Y
Y → X → Z
Y → Z → X
The steps in which a bacterial cell reproduces is Y → X → Z Option C
What is reproduction?The term reproduction refers to the process by which new organisms appear. We know that reproduction must involve the fusion of male and female gametes to yield an offspring. The fusion of the male and female gametes can be described by genetics.
Now we know that bacteria are single cell organisms and that they tend to reproduce by cell division or as-exually. This implies that the fusion of gametes do not occur here.
Hence, the correct order for the steps that are involved in the reproduction of bacterial cells are;
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Answer:
C. Y X Z
Explanation:
The chemical breakdown of starch that occurs in the mouth is due to the enzyme action of:_______.
Because of the enzyme action of Amylase, the chemical breakdown of starch happens in the mouth.
It is an enzyme, simply a type of protein that aids in breaking down the carbohydrates in your body. The main two glands as the pancreas and salivary glands help in making amylase in your mouth.
A small amount of amylase is also present in your urine and blood. If the levels present in your body are high then it causes health problems.
The amylase test performs to know the amount of amylase present in your body. This test is called as "amy test".
The normal range of Amylase in the human body is 40 to 140 U/L or 0.38 to 1.42 microkat/L.
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What is the change in enthalpy at 25°c and 1 atm for the production of 3. 00 mol sn(s)? sn(s) sno2(s) → 2sno(s); δh° = 16. 2 kj
The addition of the product of volume and pressure along with internal energy is called enthalpy. The change in the enthalpy at 1 atm is 24.3 kJ. Thus, option d is correct.
What is enthalpy?Enthalpy is the measurement of the heat or the energy present in a system that has a constant pressure in the thermodynamic system.
The balanced equation is shown as,
Sn (s) + SnO₂ (s) → 2SnO (s) , ΔH° = 16.2 kJ
The enthalpy change for the reaction is for 2 moles of Tin(II) oxide. So, for 3 moles of Tin(II) oxide produced in the reaction the enthalpy change will be given as,
= (16.2 kJ × 3 mol) ÷ 2 mol
= 24.3 kJ
Therefore, option d. 24.3 kJ is the enthalpy change.
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Your question is incomplete, but most probably your full question was, What Is The Change In Enthalpy At 25°C And 1 Atm For The Production Of 3.00 Mol SnO(S)? Sn (s) + SnO₂ (s) → 2SnO (s) , ΔH° = 16.2 kJ.
-24.3 kJ-16.2 kJ16.2 kJ24.3 kJ5.4 kJa. True or
b. False:
Nadh and Fadh2 donate electrons to the electron transport chain at the same point.
The statement NADH and FADH2 donates electrons to the electron transport chain at the same point is true.
Aerobic cellular respirationThe third stage of aerobic cellular respiration in living cells is oxidative phosphorylation. It involves the electron transport chain and chemiomosis, two separate processes. In order to create a proton pump (gradient) that will be used to fuel ATP production, the electron transport chain includes the transfer of electrons from one molecule to another.The initial electron donors in the electron transport chain are the reduced electron carriers NADH and FADH2, which are created during the Kreb cycle (the second stage of cellular respiration).In this step NADH and FADH2, donates electrons to the electron transport chain at the same time. Hence, with the above details we can conclude that the given statement is true.
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What would the corresponding
concentration values of OH- be for
the pH values: 1, 3, 5, 7, 9, 11?
The corresponding concentration values of OH⁻ for the pH values
of following are -
1- 10⁻¹
3- 10⁻³
5- 10⁻⁵
7- 10⁻⁷
9- 10⁻⁹
11- 10⁻¹¹
What do you mean by the pH value ?
pH is a logarithmic measure of the hydrogen ion concentration of an aqueous solution pH = -log[H+]
pH describes how acidic or basic an aqueous solution is, where a pH below 7 is acidic and a pH greater than 7 is basic. pH of 7 is considered neutral .
Functions of OH− :
OH− functions as a base .
Hydroxide is a diatomic anion with chemical formula OH−. It consists of an oxygen and hydrogen atom held together by a single covalent bond, and carries a negative electric charge.
Hence, this way pH values of these concentrations are mentioned .
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All simple metal with acid reactions are ____ displacement reactions.
Answer:
single displacement
Explanation:
the metal replaces the hydrogen of the acid to for a salt and hydrogen gas
Match the following vocabulary words with their correct definitions.
1. single displacement
2. reactant
3. double displacement
4. product
One of the starting substances
involved in a chemical reaction.
lons in aqueous compounds
exchange cations and anions
respectively.
A substance formed as a result of a
chemical reaction.
One element replaces another in a
compound.
Single displacement
One element replaces another in a compound.Reactant
One of the starting substances involved in a chemical reaction.Double displacement
Ions in aqueous compounds exchange cations and anions respectively.Product
A substance formed as a result of a chemical reaction.What is the color of the indicator thymol blue in a solution that has a ph of 11?.
Answer:
Red
Explanation:
Red color is evidenced when thymol blue indicator is in a solution having a pH of 11. A pH of 11 means that the solution is basic or alkaline. Therefore, the indicator turns red, indicating that the solution is alkaline.
When thymol blue indicator is in a acidic solution, the indicator remains blue.
What can be said about this reaction when the concentration of 2-phosphoglycerate is 0.490 mm and the concentration of 3-phosphoglycerate is 2.90 mm at 25°c?
The reaction is at equilibrium. Option C
What is the equilibrium constant?The term equilibrium constant refers to a value that shows the extent to which reactants are converted into products in the reaction.
We know that;
∆G =∆G'° + RT In Keq
∆G'° = −4.40 kJ/mol
R = 8.314 J/K/mol
T = 25 + 273 = 298 K
Thus;
∆G = −4.40 * 10^3 + (8.314 * 298 * ln[2.90 * 10^-3/0.490 * 10^-3]
∆G = −4.40 * 10^3 + 4.40 * 10^3
∆G = 0
Hence, the reaction is at equilibrium.
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1) Consider the following metabolic reaction:
2-Phosphoglycerate ® 3-Phosphoglycerate DG°' = −4.40 kJ/mol
What can be said about this reaction when the concentration of 2-phosphoglycerate is 0.490 mM and the concentration of 3-phosphoglycerate is 2.90 mM at 25°C?
I. This reaction is endergonic under these conditions.
II. This reaction is exergonic under these conditions.
III. This reaction is at equilibrium under these conditions.
IV. This reaction is not favorable under standard conditions.
A) I, IV
B) II only
C) III only
D) IV only
E) None of the above
2) Consider the following metabolic reaction:
As a gaseous element condenses, the atoms become ________ and they have ________ attraction for one another.
As a gaseous element condenses, the atoms become close together and they have more attraction for one another.
What is condensation?
Condensation is the transformation of water from its gaseous or vaporous state into its liquid state. It typically occurs when warm airborne vapor comes into contact with a cold surface. When gas molecules transfer their energy to a cooler surface, they begin to slow down and attract one another, forming a liquid.Examples:
Dew in the morning occurs when moisture in the air condenses on grass that has been chilled over night.Droplets on the soda can. Moisture from the warm outer air condenses on the outside of the can due to its cool surface.A foggy windscreen. The moisture in the air in your automobile is increased by the breath and body heat of the passengers. The moisture condenses as droplets that fog your window when there is enough moisture present and a chilly enough windscreen.Learn more about the condensation with the help of the given link:
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How many milliliters of 0. 0140 m na2s2o3 solution are needed to dissolve 0. 590 g of agbr? agbr(s) 2na2s2o3(aq)→na3ag(s2o3)2(aq) nabr(aq)
The molarity of the solution can be used to give the moles and the volume of the solution. The 0.0140 M sodium thiosulfate needs 225 ml of volume.
What is molarity?Molarity is the property of the solution that is given by the ratio of the moles of the solute to the volume of the solution in liters.
Given,
Molarity of Sodium thiosulfate = 0.0140 M
Mass of solute (AgBr) = 0.590 gm
Molar mass of AgBr = 187.77 g/mol
First moles from the mass can be calculated as,
Moles = mass ÷ molar mass
n = 0.590 g ÷ 187.77 g/mol
= 0.00314 moles
Now, the volume of the solution from molarity is calculated as,
Volume = moles ÷ molarity
= 0.00314 moles ÷ 0.0140
= 0.225 L
Therefore, 225 mL is the volume required.
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An overpack containing four one-liter metal cans of NA1993, Compounds, cleaning liquid, a Class 3 (Flammable liquid), PG III, being offered for transportation by highway, may qualify for _______________
An overpack containing four one-liter metal cans of NA1993, Compounds, cleaning liquid, a Class 3 (Flammable liquid), PG III, being offered for transportation by highway, may qualify for specification packaging. This is further explained below.
What is specification packaging?Generally, The term "specification packaging" refers to a package that meets one of the packaging specifications or standards listed in this subchapter's parts 178 or 179.
In conclusion, It's possible that an overpack that contains four metal cans of one liter each filled with NA1993, Compounds, cleaning liquid, a Class 3 (Flammable liquid), PG III, and that's being provided for transportation on the highway might qualify as specified packing.
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What is the molality of a solution containing 3. 0 moles of nacl and 100. 0 moles of water?
The molality of a solution containing 3. 0 moles of NaCl and 100. 0 moles of water is 30 mol/kg.
The number of moles of solute in a solution equal to 1 kg or 1000 g of solvent is referred to as its molality. Mole per kilogram of solvent is the SI unit for molality.
Given:
3.0 moles of NaCl in 100 moles of water.
To find:
The molality of the solution
The moles of solute (NaCl) = 3.0 moles
The mass of solvent (water) = 100 moles (0.1 kg/mol)
Molality of a solution = Number of Moles of solute/ Mass of solvent(kg)
= 3.0 moles/0.1 kg/mol
= 30 mol/kg
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Why do night bird have extraordinary night vision
Answer:
The low light eye sight depends on the rod cells of the eye,and the birds have more amount of rod cell in their eyes, that's why they have an extraordinary night vision
Reaction rate is increased by an increase in kinetic energy
of the reacting particles when their
is _____________
increased
A . Collision theory
B . Surface Area
C . Temperature
D. Concentration
Answer:
Reaction rate is increased by an increase in kinetic energy
of the reacting particles when their
is _temperature_
increased
A . Collision theory
B . Surface Area
C . Temperature
D. Concentration
In a chemical hot pack, iron powder and oxygen react to form iron oxide in the presence of a catalyst. This reaction causes the temperature of the hot pack to increase. This process is
Answer:
exothermic
Explanation:
exothermic reactions give off heat.....or the temp of the substances increases
You are asked to weigh approximately 0. 4g of acetylsalicylic acid to the nearest mg. When you enter the data in grams in your lab notebook, how many significant figures will you record ?.
Number of significant figures will be 1.
Given:
weight of acetylsalicylic acid = 0. 4g
Significant figures are the digits of value which carry meaning towards the resolution of the measurement. They are also called significant figures in chemistry. All the experimental measurements have some kind of uncertainty associated with them.
When we convert 0.4g acetylsalicylic acid to mg we get value 400mg
when we convert 400mg to gram we get value of 0.4 gram
Since 0 before a decimal is not significant so there is only one significant figure that is 4.
How do you determine the number of significant figures?The zero to the left of a decimal value less than one is meaningless.All trailing zeros that are placeholders are meaningless.The presence of zeros between non-zero numbers is significant.Non-zero numbers are all significant.If a number contains more digits than the desired number of significant digits, it is rounded.Why 'Hidden Figures' is so important?It's an important story for a variety of reasons, and it comes at a time when people are looking to Hollywood more than ever to tell stories that represent them. Hidden Figures is that movie for many, and it's critical that everyone sees these women in action. This is why. This film tells a story that you've probably never heard before.
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Heat transferred laterally in the atmosphere by horizontal wind movements is a process called?
Answer:
Advection
Explanation:
Advection refers to the process over which heat transferred laterally in the atmosphere by horizontal wind movement.
A sample 0. 100 moles of a gas is collected at at stp. What is the volume of the gas in liters?
A sample 0. 100 moles of a gas is collected at at STP . 2.24 is the volume of the gas in liters.
The STP means standard temperature and pressure.
At STP,
Temperature = 0 °C =273 K
Pressure = 1 atm
We get value of volume by using ideal gas equation,
PV = nRT
P is the pressure of the gas = 1 atmV is the volume occupied by the gas = ?n is the number of the moles = 1 moleT is the temperature of the gas = 273 K or 0 °CR universal gas constant = 8.31 J/ mole × KCalculation,
Since, one mole of a gas occupy 22.4 L volume at STP
So, for 0.1 mole volume occupy = 22.4L × 0.1 mole/1 mole = 2.24L
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find the relative molecular mass of MgCo3
The molecular mass of MgCO3 is 84.313 grams/mol.
How Does The molecular Mass Calculator Work?The standard atomic weights for that element are listed in a table, and each atom is compared to those values. The molar mass calculator displays the findings in a table at the bottom that includes the number of atoms, the atomic weights of the constituent elements, and the molecule's molecular weight. It provides a solution for a molecular formula's overall mass.From there, we dissect the components of the formula for magnesium carbonate: an atom of magnesium, an atom of carbon, an atom of oxygen, etc.You will need to unpack any bracketed expressions because (yet) we don't have brackets implemented. They have no impact on weight in any case. Multiply each element by how many times the structure in brackets appears. For instance: C6H5-3PCCO becomes C18H15-3PCCO.The relative molecular mass of MgCo3
Symbol Mg C O
Atoms 1 1 3
Name Magnesium Carbon Oxygen
Atomic 12 6 8
Molar Mass 24.305 12.011 15.999
Total 24.305 12.011 47.997=84.313
The molecular mass of MgCO3 is 84.313 grams/mol.
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A 45. 0 l gas cylinder contains 988 g he at 23 °c. what is the pressure inside the cylinder? (r = 0. 08206 l⋅atm/mol⋅k)
a. 10. 4 atm
b. 533 atm
c. 41. 4 atm
d. 133 atm
e. 101 atm
A 45. 0 L gas cylinder contains 988 g He at 23 °C then pressure inside the cylinder is 134.67 atm.
Calculation,
Formula used :The ideal gas equation is given as,
PV = nRT ....(i)
Where , P is pressure of the gas = ?
V = volume of the gas = 45. 0 L
R = universal gas constant = 0. 08206 L⋅atm/mol⋅K
T = Temperature = 23 °C = 23 + 273 = 299 K
n = number of moles = given mass/ molar mass = 988 g/4 = 247 moles
Putting the value of P , V , T , R and n in equation (i) we get
P×45. 0 L = 247 moles× 0. 08206 L⋅atm/mol⋅K×299 K
P = 247 moles× 0. 08206 L⋅atm/mol⋅K×299 K /45. 0 L = 134.67 atm
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Calculate how many moles of nh3 form when each quantity of reactant completely reacts?
3.6 moles [tex]NH_{3}[/tex] required when each quantity of reactant completely reacts.
The ratio of the mole quantities of any two compounds present in a balanced chemical reaction is known as the mole ratio. A reaction's product yield can be predicted using mole ratios, as can the amount of reactant required to produce a specific amount of result.
The balanced chemical equation is :
[tex]3N_{2} H_{4}[/tex](l) → [tex]4NH_{3}[/tex](g) + [tex]N_{2}[/tex](g)
Given is = 2.6 mol [tex]N_{2} H_{4}[/tex]
As we see, 3 moles of [tex]N_{2} H_{4}[/tex] reacts with 4 moles of [tex]NH_{3}[/tex].
Therefore,
n( [tex]NH_{3}[/tex]) = n( [tex]N_{2} H_{4}[/tex] ) × [tex]\frac{4}{3}[/tex]
n( [tex]NH_{3}[/tex]) = [tex]2.6mol^{*} \frac{4mol}{3mol}[/tex]
n( [tex]NH_{3}[/tex]) = 3.6 moles.
Therefores, 3.6 moles [tex]NH_{3}[/tex] required when each quantity of reactant completely reacts.
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During transpeptidation, nucleophilic attack occurs between the α-amine group in the ____ site and the esterified carbon in the ____ site.
During transpeptidation, nucleophilic attack occurs between the α-amine group in the A site and the esterified carbon in the P site
What is transpeptidation ?A chemical process in which an amino acid residue or peptide residue is transferred from one amino compound to another. This process occurs when a protease reversibly converts one peptide to another.
a process where one or more amino acids are transferred from one peptide chain to another, as in the case of a transpeptidase activity, or where a peptide chain itself is produced, as in the case of the production of a bacterial cell wall.Peptidoglycan glyco-syltransferases create the glycan strands (PGTs). The most popular class of antibiotics' fatal targets are enzymes termed transpeptidases (TPs), which produce the peptide crosslinks: using beta-lactamsLearn more about Transpeptidation reaction here:
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If you reacted 93.7 grams of iron with excess copper sulfate solution, what mass of copper would you expect to make? you may need to balance the equation first. fe cuso4 -> cu feso4
Answer is although the question should have 3 significant figures.
What is significant figures? Chemical equationFe + CuSO4 --> Cu + FeSO4
It is already balanced
Molar ratios1 mol Fe : 1 mol CuSO4 : 1 mol Cu : 1 mol FeSO4
atomic masses of Fe and CuFe: 55.8 g/mol
Cu: 63.5 g/mol
number of moles of Fenumber of moles = mass in grams / atomic mass = 93.7 g / 55.8 g/mol = 1.679 mol
number of moles of Cu:1 mol Fe / 1 mol Cu => 1.679 mol Fe / 1.679 mole Cu
mass of Cu in 1.679 moles Cumass = atomic mass * number of atoms = 63.5 g/mol * 1.679 moles = 106.6 g = 107 rounded to 3 significant figures.
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Please help,
How could you tell a Ca(NO3)2 solution from a Zn(NO3)2 solution?
Answer:
you better give me brainliest
Explanation:
Zinc nitrate and calcium nitrate solution can be distinguished by reaction with ammonium hydroxide. Zinc forms a white gelatinous ppt. whereas there is no precipitation of calcium hydroxide even with excess of ammonium hydroxide
How many electrons are transferred in the given redox reaction? zn 2agno3⟶2ag zn(no3)2
The electrons are transferred in the given redox reaction are 2 electrons.
what is redox reaction?When oxidation and reduction that is gaining of electron and loosing of electrons takes place simultaneously in a chemical reaction then it would be known as redox reaction.
In terms of oxygen the gaining of oxygen is oxidation and loosing of oxygen is reduction.
In the given chemical reaction the transfer of two electrons will be as follows
Zn₂ (2e) + AgNo₃ → 2Ag (2e) + Zn(NO₃)₂
It is clear from the reaction their is transfer of two electrons zinc is loosing 2 electrons undergoes to oxidation while silver gets reduced.
Therefore, transfer of only two electrons.
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In Birkeland and Eyde's process, ____ is prepared from atmospheric oxygen and nitrogen.
Synthetic fertilizer
What is Birkeland and Eyde's process?
It is a process developed by two scientists - Kristian Birkeland and Sam Eyde - to fix atmospheric nitrogen for the production of fertilizer.
The nitrogen oxide produced is then used in the production of nitric acid and eventually, the production of synthetic fertilizer.
First, nitrogen is fixed into nitrogen oxide:
[tex]N_2 + O_2 --- > 2NO[/tex]
Then, the NO is oxidized:
[tex]2NO + O_2 -- > 2NO_2[/tex]
The nitrous oxide produced is then dissolved in water to form nitric acid:
[tex]3NO_2 + H_2O --- > 2HNO_3 + NO[/tex]
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A gas has a volume of 27. 5 L at 302 k and 1. 40 atm. How many moles are in the sample of gas?
There are 1.554 moles are in the sample of gas when a gas has a volume of 27. 5 L at 302 K and 1. 40 atm.
Calculation,
The given question is solved by the using of ideal gas equation which is shown below.
PV = nRT .... ( i )
where , P is he pressure of the gas = 1. 40 atm
V is the volume occupied by the gas = 27.5 L
R is the universal gas constant = 0.082 L atm/K mol
T is the temperature = 302 K
n is he number of moles of the gas = ?
By putting the value of pressure P , volume V , Universal gas constant and temperature T in the equation ( i ) we get the number of moles.
1. 40 atm × 27.5 L = n × 0.082 L atm/K mol× 302 K
n = 1. 40 atm × 27.5 L/0.082 L atm/K mol× 302 K = 1.554 mole
There are 1.554 moles are in the sample of gas
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How many protons, neutrons and electrons, in that order are present in the anion formed by one atom of 79se? group of answer choices 34, 34, 45 34, 45, 34 32, 45, 34 34, 45, 36 36, 45, 36
There are 34 protons , 45 neutrons and 36 electrons, in that order are present in the anion formed by one atom of 79Se .
Calculation
The number of electron / protons ( present in the nucleus ) of the atom is equal to atomic number .
The sum of number of electron / protons ( present in the nucleus ) and neutrons ( present in the nucleus ) of the atom is called atomic mass.
The atomic number of Se = 34
The Mass number or atomic mass of Se = 79
The anion of Se = [tex]Se^{-2}[/tex]
It means two electron loss by Se and form [tex]Se^{-2}[/tex] .
So , the difference between number of electrons and protons = 2
Hence , number of electron and proton in [tex]Se^{-2}[/tex] anion is 34 ( two less than number of protons ) and 36
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When solutions of sodium sulfide and copper(ii) sulfate are mixed, a precipitate of copper(ii) sulfide is formed. what is the net ionic equation for this reaction?
When solutions of sodium sulfide and copper(ii) sulfate are mixed, a precipitate of copper(ii) sulfide is formed. The net ionic equation for this reaction is Cu⁺² (aq) + S⁻² (aq) → CuS (s).
What is Balanced Chemical Equation ?The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.
Now first write the balanced chemical equation
CuSO₄ (aq) + Na₂S (aq) → CuS(s) + Na₂SO₄ (aq)
Now write the net ionic equation
Cu⁺² (aq) + SO₄⁻² (aq) + 2Na⁺ (aq) + S⁻² (aq) → CuS (s) + 2Na⁺ + SO₄⁻² (aq)
So the net ionic equation is
Cu⁺² (aq) + S⁻² (aq) → CuS (s)
Thus from the above conclusion we can say that When solutions of sodium sulfide and copper(ii) sulfate are mixed, a precipitate of copper(ii) sulfide is formed. The net ionic equation for this reaction is Cu⁺² (aq) + S⁻² (aq) → CuS (s).
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