The element could be X is phosporus .
What is element?
An element is the fundamental item that can't be easily broken onto smaller of pieces. In chemistry and physics, an elementary is a substance that can't be broken down by non-nuclear reactions. In computing and the mathematics, an element is the distinct piece of a larger system or set.
Sol-An ionic compound is formed by the ions, which their charges replaced, so the compound Na₂X is formed by the ions Na⁺ and X⁻². Thus, X must gain two electrons to be stable at the octet, so it has 6 valence electrons. Because it can accommodate up to 12 electrons, the elememts expands the octet, do it must be in the 3rd period or higher.
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where was oxygen discovered?
Answer: nowhere from trees
Explanation:
g the electron geometry of a molecule depends on the number of regions of electron density around the central atom in a molecule. if a molecule presents 3 regions around the central atom, which would be the predicted electron geometry?
The predicted electron geometry is a trigonal planar geometry.
What is electron geometry?Molecular geometry is the three-dimensional arrangement of atoms that make up a molecule. This includes not only the general shape of the molecule, but also bond lengths, bond angles, torsion angles, and all other geometric parameters that determine the position of each atom.The arrangement of electron groups is determined by the number of electron groups. On the other hand, the molecular shape depends not only on the number of electron groups, but also on the number of lone pairs. If the electron groups are all bond pairs, they are named exactly like the electron group geometry. The two regions of electron density around the central atom of the molecule form a rectilinear geometry. The three regions form a trigonal planar geometry. Four regions form a tetrahedral geometry. The five regions form a trigonal bipyramidal geometry. Six regions form an octahedral geometry.To know more about electron geometry visit:
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Plant and animal cells are very similar, but they also contain certain differences. how are plant and animal cells different? choose three correct answers.
The plants and animal cells are different because:
-Vacuoles are much larger in plant cells than in animal cells because they hold more water to stay upright
-Plant cells have cell walls to provide a stronger external structure and animal cells do not.
-Special organelles called chloroplasts are found in plant cells and not in animal cells to allow them to produce their own food.
In the field of biology, cells can be described as the building blocks from which all life forms on Earth are built.
Plant cells have chloroplast through which light energy can be trapped. This light energy is used by plants to make their own food. The animal cells lack chloroplast because they do not make their own food.
Plants cells have the cell wall as the outermost covering whereas animal cells do not have a cell wall. The outermost covering of the animal cells is the cell membrane only.
A plant cell has a single, large vacuole in the middle of the cell that is used for maintaining turgidity and storing water. Animal cells do not have smaller and numerous vacuoles.
Although a part of your question is missing, you might be referring to this question:
Plant and animal cells are very similar, but they also contain certain differences. how are plant and animal cells different? choose three correct answers.
Vacuoles are much larger in plant cells than in animal cells because they hold more water to stay upright
Animal cells contain a nucleus and plant cells do not
Plant cells have cell walls to provide a stronger external structure and animal cells do not.
Plant and animal cells are both completely the same and they have no differences.
Special organelles called chloroplasts are found in plant cells and not in animal cells to allow them to produce their own food.
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Which of the following ions is a polyatomic ion?
OP³-
OOH
0²-
Mg
Polyatomic ion is OOH
Polyatomic ion are ion which consist of more than one atom and atom in a polyatomic ion are usually covalently bonded to one another and therefore stay together as a single or charged unit and here OOH there are two oxygen atom and one hydrogen atom that's it is polyatomic ion
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the difference in the atomic radii of fluorine and lithium is most similar to the difference in the atomic radii of which pair of elements?
As one proceeds through the periodic table from left to right, the atom of each element gets smaller. Lithium's higher atomic radius than that of fluorine is most comparable.
What is meant by atomic radii?Atomic radius, also known as atomic radius, is the total length between an atom's nucleus and its electron's outer orbital. The average or normal distance between the nucleus's center and the edge of the surrounding electron shells is what we refer to as an element's ionic radii.
Why do atomic radii occur?This is due to the fact that there are higher energy levels, resulting in a wider gap between electrons and protons. The attraction between the remaining electrons and the positive charges nucleus is also reduced as a result of electron shielding, allowing them to move further away from it. As a result, the size and atomic radius grows.
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how many grams of koh is required to produce 800 ml of 0.500 m naoh solution? enter the number only, not units
For every 800 ml of 0.500 m potassium oxide solution, one gramme of potassium hydroxide is needed.
The following knowledge is necessary to answer the question:
KOH has a molar mass of 56u.
Molarity is defined as Mass of Solute multiplied by 1000 or (Molar mass of Solute divided by mL of Solution).
Given are the values M=0.4 and V=800mL.
The formula yields the following result: 0.5 = Mass of KOH 1000/(56 800).
When it is solved, 8 grammes of KOH are required.
Molar mass simple: What is it?The molar mass of a substance is the weight of one mole of that substance, how many grammes are contained in one mole of a specific chemical is what is meant by the term "molar mass." The atomic masses used to calculate the molar mass are given in the periodic table.
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what mass, in grams, of cacl2 is required to prepare exactly 500 ml of a 0.24000000000000002 m solution of cacl2?
11.10 moles of cacl2 are required
Lets 0.24000000000000002m approx. be 0.2m
so, Molarity = 0.2m
volume = 500 ml
we know that
molarity = no. of moles of solute (cacl2) / volume of solutions
0.2m = n / 0.5 L
n = 0.1 moles of cacl2
now,
1 mole of cacl2 = 110.98 gm
so,
o.1 moles of cacl2 = 11.10 gm
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An experiment was carried out to find
out how the mass of potato chips
changed when they were left in sugar
solutions of different strengths. The
table of results is shown below. Would
you expect the value of X to be more or
less than 2.5g?
Answer:
the answer would be more than 2.5g
Explanation:
Which statement about exothermic reactions is true?
The reactants have more heat energy than the products.
The reactants have more heat energy than the products.
Energy from an outside source is continuously being added.
Energy from an outside source is continuously being added.
More heat is given off than is put into the reaction.
More heat is given off than is put into the reaction.
The reaction container always feels cold.
The reaction container always feels cold.
The statement true about Exothermic reaction is
The reactants have more heat energy than the products.
What is exothermic reaction ?
A chemical reaction that releases energy is called exothermic. In an exothermic reaction, more energy is released forming a bond in the product than is used to break the bond in the reactants. An exothermic reaction is accompanied by an increase in temperature of the reaction mixture.
If a reaction releases more energy than it absorbs, the reaction is exothermic and enthalpy will be negative. Think of this as an amount of heat leaving (or being subtracted from) the reaction. If a reaction absorbs or uses more energy than it releases, the reaction is endothermic, and enthalpy will be positive.
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what is the ph of a solution obtained by dissolving two extra-strength aspirin tablets, containing 450 mg of acetylsalicylic acid each, in 300 ml of water?
The ph of a solution obtained by dissolving two extra-strength aspirin tablets is 8.
The Concentration of solution is a measure of the quantity of solute that has been dissolved in a given amount of solvent or answer. A concentrated answer is one that has a rather huge quantity of dissolved solute.
Calculation:-
volume = 300 ml = 0.3 L
mass = 450 mg
molar mass C₉H₈O₄ = 180
mole = mass / molar mass
= 450/180
= 2.5 mol
Concentration = mole/volume
= 2.5 /0.3
= 8.33
PH = - llog[H+]
= 8.
The concentration of a substance is the quantity of solute found in a given amount of solution. Concentrations are normally expressed in terms of molarity, defined because of the variety of moles of solute in 1 L of answer.
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hydrochloric acid, hcl, is frequently used for titrations, but making a precise molarity of hcl is very difficult. instead, an approximate solution of hcl is made and then analyzed by titration with sodium hydroxide to determine its precise molarity. the titration reaction is hcl naoh nacl h2o. if 26.18 ml of 0.0995 m naoh is required to titrate 25.00 ml of hcl, what is the molarity of the hcl?
The molarity of the HCl 0.104 M
What is molarity?Molarity of a solute is defined as the ratio of number of moles of solute to the volume of solution (L). Solute molarity is sometimes omitted by enclosing the solute chemical formula in square brackets. For example, the concentration of chloride ions in solution can be written as [Cl⁻]. Molarity allows you to convert between the volume of a solution and the moles (or mass) of a solute.
For the given case,
HCl + NaOH --> NaCl + H2O
Since,
M₁V₁ = M₂V₂
M₁ = concentration of NaOH
V₁ = volume of NaOH
M₂ = concentration of HCl
V₂ = volume of HCl
Substitute the given values in the equation mentioned above:
26.18 × 0.0995 = M₂ × 25.00
2.60491 = 25 M₂
M₂ = 0.104 M
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On US Interstate system, the maximum speed is 121km/h. How far will you travel if you
maintained this speed for 3 hours and 20 minutes?
The distance that will be traveled by me on the US interstate system will be 403.3 km.
What is distance?Distance is the total length between two points. Distance is the total movement of an object without any regard to direction. We can define distance as to how much ground an object has covered despite its starting or ending point.
To calculate the distance traveled;
d = Vt
Where;
d = Distance traveled by me
V = Maximum speed
t = Time
Given:
V = 121 km/h
t = 3 hours 20 minute = 10/3 hours
Substituting the values in the formula
d = 121×10/3
d = 403.3 km
In conclusion, the distance traveled by me will be 403.3 km.
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2. after work-up, the product of the wittig reaction was recrystallized from hot isopropanol. you were told to do a gravity filtration using a heated stemless funnel if the solution appeared cloudy. what was the likely identity of compound that caused the cloudiness? it was also indicated that the filter should be washed with hot isopropanol if crystals started to form on the stemless funnel. why would hot isopropanol be used instead of cold isopropanol
The molecules of isopropyl alcohol do not stick collectively as strongly at room temperature as water molecules do, because of this the alcohol evaporates more quickly than water does.
DNA isn't soluble in ethanol, consequently, it will clump collectively and come to be visible. The colder the ethanol, the less soluble the DNA can be in it, which is why it's far critical for the ethanol to be kept bloodless.
Isopropyl Alcohol may also shape an ignitable vapor/air combination in closed tanks or boxes. Isopropyl Alcohol can react with AIR and OXYGEN over the years to shape unstable peroxides which can explode. Isopropyl Alcohol forms explosive combos, whilst heated, with ALUMINUM.
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which of the following element pairs would be most likely to form an ionic compound? a) hydrogen; carbon b) nitrogen; oxygen c) oxygen; carbon d) calcium; carbon e) sodium; potassium
Among the above given element pairs none of them are likely to form ionic compounds
Ionic bonds are basically the electrostatic attractions formed between oppositely charged ions in an ionic compound. Generally ionic bonds are often formed when electrons are transferred from metal atom to a non metal atom.
We can say that ionic bond is most likely formed between metal and nonmetal elements .
In the above given electron pairs none of the pairs given are likely to form ionic compounds as none of the pair is of a metal and a nonmetal. An element can be classified as a metal if its found on the left side of the periodic table while non metals are located on the right of the periodic table.
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Marie mixed 5 g of carbon with 5 g of lead oxide.
She heated the mixture strongly for 15 minutes in a fume cupboard.
After 15 minutes, Marie found some shiny beads in the mixture.
a.
i) Marie collected all the shiny beads from this experiment.
How could she test them to show they were metal?
_________________________________________________________
_________________________________________________________
ii) Marie’s test showed that the tiny beads were metal.
What metal were the beads likely to be?
________________________________________________________
b. Marie also expected carbon dioxide to be formed in this experiment.
i) In carbon dioxide, what element is combined with carbon?
__________________
ii) Where, apart from the air, did this element come from in this experiment?
__________________
c. Give one safety precaution Marie should take during this experiment.
1. Marie could test if the beads she collected were metals by seeing if they conducted electricity or by adding it to a dilute acid to see if hydrogen gas is evolved.
2. Since the reaction involved a metallic oxide, lead oxide, the metal would most probably be Lead.
3. The element that is combined with carbon in carbon dioxide is oxygen.
4. The element oxygen in this experiment comes from lead oxide.
5. Marie should wear goggles as a piece of safety equipment in this experiment.
What are some properties of metals?Metals are shiny hard substances that form positive ions by the loss o electrons.
Some properties of metals include;
high densityability to conduct heat and electricitymalleable and ductileproduces sound when struckLead is an example of metal whereas lead oxide is a compound of lead and oxygen.
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which of the following statements is/are correct? 1. a diamagnetic substance is strongly attracted to a magnetic field. 2. substances that retain their magnetism after they are withdrawn from a magnetic field are called ferromagnetic. 3. most transition metals and all lanthanide metals are ferromagnetic
The following statements are correct 2 only.
A diamagnetic material is strongly attracted to a magnetic field. A material that retains its magnetism after being removed from a magnetic field is said to be ferromagnetic. Most transition metals and all lanthanide metals are ferromagnetic. Paramagnetic compounds are attracted to magnetic fields, whereas diamagnetic compounds are repelled by magnetic fields.
Paramagnetic compounds have unpaired electrons whereas in diamagnetic compounds all electrons have paired spins. They stick to ferromagnetic materials such as iron and ferrous objects such as steel. This includes everything from the steel body of your car to your refrigerator door. It is also attracted to nickel, cobalt, and other rare earth elements.
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Draw a valid lewis structure for methane, ch4. What is the formal charge on the carbon atom?.
Methane is the common name for methane. In the organic molecule, it is the simplest hydrocarbon and a hydride of carbon. Tetrahedral in shape and with an exact bond angle of 109.50 in Lewis structure.
The methane molecule has the Lewis structure, Dots are used to indicate the positions of electrons surrounding the atoms in a molecule, while lines or pairs of dots are used to represent covalent connections between atoms in a Lewis structure. The goal of creating a Lewis dot structure is to locate the molecules' lone electron pairs in order to establish how chemical bonds are formed. Natural gas's primary component and the simplest alkane is methane, a chemical molecule with the molecular formula methane (one carbon atom bound to four hydrogen atoms).
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What is social anxiety disorder?
Answer:
You might get nervous and anxiety about meeting up in society
hat is the chemical symbol for magnesium?
Mo
Mn
Mg
Md
Answer:
The chemical symbol for Magnesium is Mg
Explanation:
As you can see on the periodic table Magnesium is in group two and has the element symbol of Mg
Hope this helps, have a great day!
A chemist runs the following decomposition reaction: C2H6 → 2 C + 3 H2
If she starts with 50.0 g of C2H6, how many grams of carbon will be made?
1) PbBr₂ (1) What ions are present? Which one will move towards the cathode? Which one will move towards the anode? Write the anode half equation. Write the cathode half equation. f) Write the overall redox reaction.
The ions are present in cations and anions.
The cathode Positively charged cations.
The anode is negative ions.
The oxidation occurs is Zn(s) = Zn2+ (aq) + (2e-).
A redox reaction combines two half-reactions into one complete formula. Electrons lost in the oxidation half-reaction are gained in the reduction half-reaction. Thus, a redox reaction is a chemical reaction in which electrons are transferred between the two species.
A substance that is reduced in a chemical reaction is called an oxidizing agent and a substance that is oxidized is called a reducing agent. Example of the redox reaction of zinc and copper. A reaction is complete when it reaches equilibrium, that is when the concentrations of reactants and products stop changing. If the equilibrium constant is very large.
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the salad is physical or chemichal change
Answer:
physical change
Explanation:
bcoz we make salad with raw vegetables and fruits
The salad is a physical change.
Making a fruit salad with raw fruits is a physical change because in this process chemical composition of fruits is not changed.
Telling the difference between a chemical change and a physical change seems trickier than it is. The main difference between a chemical change and a physical change is what happens to a substance’s composition. Here are the basic definitions of chemical and physical changes:
chemical change – a process in which chemical bonds are broken or created to make a new substance
physical change – a process in which a substance changes its state of matter, but chemical bonds stay intact
When matter undergoes a chemical change, it can’t return to its original state without additional reactions. But when it undergoes a physical change, it only needs to return to its original state of matter. The molecules of the substance haven’t been changed at all.
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in aqueous solutions, excess hydrogen ions bind to nearby water molecules, so it is generally considered more accurate to write h (aq) as h3o (aq). what is the name of the h3o ion?
In aqueous solutions, excess hydrogen ions bind to nearby water molecules, so it is generally considered more accurate to write h (aq) as H₃O (aq) then name of the H₃O ion is hydronium ion
The hydrogen ion in aqueous solution is no more than proton and a bare nucleus although it carries only a single unit of positive charge and this charge is concentrated into a volume of space that is only about a hundred million as large as volume occupied by smallest atom in case of water this will be the lone pair electron of the oxygen atom and the tiny proton will be buried within the lone pair and will form a shared electron bond with it and creating a hydronium ion means H₃O⁺ and here H₂O is the base and the product H₃O⁺ is the conjugate acid of water
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what is the relationship between the concentration of a solution and the amount of transmitted light through the solution?
Relationship between the concentration of a solution and the amount of transmitted light through the solution is directly proportional to the molar concentration of solution
Concentration is the amount solute that has been dissolved in a given amount of solvent or solution and the percentage of light by the colored solution can be detected and converted to absorbance of light and this is directly proportional and the absorbance is directly proportional to the concentration of the substances and the higher the concentration the higher its absorbance and this is because the proportion of light that get absorbed is affected by the number of molecule that it interact with it
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14.what volume, in milliliters, of 6.0 m naoh is needed to prepare 175 ml of 0.20 m naoh by dilution?
5.83ml of NaOH is needed to prepare 175 ml of 0.20 m by dilution.
Dilution is the process of “lowering the concentration of a solute in a solution by simply adding more solvent to the solution, such as water.” Diluting a solution enables adding more solvent without adding more solute.
into formula to find out the volume is ;
[tex]V_{1}[/tex][tex]N_{1}[/tex] = [tex]V_{2}N_{2}[/tex]
where [tex]V_{1}[/tex]= ?
[tex]V_{2}[/tex] = 175ml
[tex]N_{1}[/tex] = 6
[tex]N_{2}[/tex] = 0.2
So, ⇒ [tex]V_{1}[/tex]×6 = 175×0.2
[tex]V_{1}[/tex] = 5.83 ml
So, 5.83ml of NaOH is needed to prepare 175 ml of 0.20 m by dilution.
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why is it that carbon dioxide from carbonated beverages, pets, cattle, farm animals, and humans, yeast, dry ice, fireplaces, charcoal grills, campfires, wildfires, alcohol and ethanol is ok, and carbon dioxide from fossil fuel is bad?
The amount of carbon dioxide (CO2) released when burning fossil fuels is the primary factor in why fossil fuels are so destructive. The greenhouse effect and climate change are significantly impacted by the burning and release of CO2. Our planet warms because more CO2 in the atmosphere prevents sunlight from escaping back into space.
what are fossils?
A fossil is any preserved remnants, impression, or trace of any once-living organism from a previous geological epoch (from Classical Latin: fossilis, meaning "obtained by digging"). Bones, shells, exoskeletons, animal or microbe impressions in stone, items preserved in amber, hair, petrified wood, oil, coal, and DNA traces are a few examples.
The earth's natural mechanisms have controlled greenhouse gas output for millions of years. At a pretty constant rate, gases would be absorbed and released. Meanwhile, temperatures were kept at a level that allowed for the continuation of life on Earth. This is "a balancing act," according to the Environmental Protection Agency.As the Industrial Revolution got under way in the second part of the 1700s, humans began to alter the delicate balance. Since then, we have been continuously increasing the amount of greenhouse gases, particularly CO2, that are being injected into the atmosphere. These gases trap heat and cause global warming. Despite the fact that there are many greenhouse gases, some of which are more powerful than others, CO2 currently accounts for about 84 percent of all greenhouse gases produced by human activity, or about 30 billion tonnes annually.Although forestry and industrial operations also make significant contributions, the majority of this is caused by burning fossil fuels for transportation and power.
CO2 levels were at 270 parts per million before the Industrial Revolution (ppm). In 1960, CO2 concentrations were at 313 ppm.
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the absorbance and fluorescence of a molecule are shown on a spectrum. what can be concluded about the features of the spectrum?
According to the given condition, the
absorbance
is the signal at the highest energy, or longest wavelength. The
fluorescence
is the signal at the lowest energy, or shortest wavelength.
Absorbance is the
logarithm
of the ratio of incident to transmitted radiant power through a sample. It is also known as the measure of the capacity of a substance to absorb light in a specific wavelength.
Fluorescence is the
emission
of light by a substance that has absorbed light or other electromagnetic radiation. Fluorophores are molecules that absorb light in a specific wavelength and emit light in another wavelength.
Absorbance is measured by the principle of
Beer-Lambert's
law. It is also known as Beer's law. It states that the attenuation of light to the properties of the material through which the light is travelling. It is commonly used in chemical analysis and measurements of physical optics for photons and neutrons.
In comparison with absorbance and fluorescence, it is important to consider the specificity of each method. In absorbance, a light of certain wavelength is passed through the solution to measure the optical density or concentration.
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which one is correct?
you do a calculation on a molecule and determined that the energy of the highest occupied molecular orbital (homo) is -2.42 hartree, and the energy of the lowest unoccupied molecular orbital (lumo) is 0.65 hartree. what is the wavelength of the photon required to excite this molecule from its ground state, to its first excited state?
The wavelength of the photon required to excite this molecule from its ground state, to its first excited state is 1240 nm.
This is given by the equation:
wavelength = hc/(E_homo - E_lumo)
where h is Planck's constant =6.626070 * 10^-34 J.m , c is the speed of light = 3.0 x 10^8 m/s^2, and E_homo and E_lumo are the energies of the highest occupied molecular orbital and the lowest unoccupied molecular orbital, respectively.
In this particular case, the wavelength of the required photon would be:
wavelength = hc/(-2.42 hartree - 0.65 hartree)
= 6.626070 * 10^-34 X 3.0 x 10^8 / (-3.07)
= 1240 nm
Hence , The wavelength of the photon required to excite this molecule from its ground state, to its first excited state is 1240 nm.
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write the net ionic equation for the reaction between agno3aq and na2so4aq. be sure to include states of matter in your answer.
The net ionic equation for the reaction between agno3aq and na2so4aq would be 2Ag+(aq) + SO4^2-(aq) → Ag2SO4(s)
The net ionic equation shows the chemical species involve in the chemical reaction while the complete ionic equation also involves the spectator ions. The net ionic equation state whether precipitation occurs or not. If the chemical reaction has no net ionic equation it means all are aqueous from no precipitation occurring.
AgNO3 → Ag+ + NO3-
Na2SO4 → 2Na+ + SO4^2-
2AgNO3(aq) + Na2SO4(aq) → 2Ag+(aq) + 2NO3-(aq) + 2Na+(aq) +SO4^2-(aq)
2Ag+(aq) + 2NO3-(aq) + 2Na+(aq) +SO4^2-(aq) → Ag2SO4(s) + 2NaNO3(aq)
2AgNO3(aq) + Na2SO4(aq) → Ag2SO4(s) + 2NaNO3(aq)
We cancel the spectator ions (NO3^- and Na^+)
the net ionic equation with states of matter is:
2Ag+(aq) + SO4^2-(aq) → Ag2SO4(s)
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