o3 decide whether the lewis structure proposed for each molecule is reasonable or not.
Answers
The resonance structures for the O3 molecule is shown in the image attached.
What is resonance structure?
The delocalization of electrons in certain molecules or ions is represented by resonance structures, sometimes referred to as resonance forms or canonical structures. They are used to describe molecular bonding in cases where a single Lewis structure is unable to do so.
Because of the presence of delocalized electrons or several bonding options, the arrangement of atoms and electrons in some compounds cannot be completely explained by a single Lewis structure.
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Related Questions
What can be said about 1 mole of Ag and 1 mole of Au?
Answers
Explanation:
Avogadro's number. What can be said about 1 mol Ag and 1 mol Au? ... They contain the same number of atoms.
1 mole of Ag and 1 mole of Au contain the same number of particle. Therefore, option B is correct.
What is mole ?The International System of Units uses the mole (symbol: mol) as the unit of material quantity. How many elementary entities of a particular substance are present in an object or sample is determined by the quantity of that material. It is specified that the mole contains exactly 6.022140761023 elementary entities.
A mole is defined as the mass of a substance that has the same number of elementary particles as there are atoms in precisely 12.000 g of 12C.
In the periodic chart, group 11 includes the chemical elements roentgenium (Rg), copper (Cu), silver (Ag), and gold (Au). However, no chemical tests have yet been done to demonstrate that roentgenium behaves similarly to the heavier homologue of gold.
Thus, option B is correct.
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At the candy store, gourmet jelly beans sell for $1.15 per ounce. There are 28 students in Alfred's class. If each student eats 0.035 kg of jelly beans, how much would it cost to feed the class a gourmet jelly bean treat?
Answers
Answer:
Total cost = $40.25 (Approx)
Explanation:
Given:
Per ounce = $1.15
Number of student = 28
Each student eat = 0.035 kg
Find:
Total cost
Computation:
Total weight of candy = 28 × 0.035 kg
Total weight of candy = 0.98 kg
1 ounce = 0.028 kg (approx).
Total weight of candy = 0.98 kg / 0.028
Total weight of candy = 35 ounce (Approx)
Total cost = 35 × $1.15
Total cost = $40.25 (Approx)
Why does the carbon anode burn away in the electrolysis of aluminium chloride?
Answers
Can someone help me with this chemistry question?
(This isn't the question but I need some help, I'll give 50 points to whoever can correctly answer my next question)
Answers
Answer:
We can't see the question. Can you upload a picture of it or write the question in the comments
KK
Which chemistry question?
How many molecules of hydrogen are required to react with 65 molecules of nitrogen?
Answers
Explanation:
Refer to pic...........
A student draws a diagram that describes how she thinks people see in the dark. Based on her drawing, she predicts that if people stay
in a totally dark room for a long time, eventually their eyes will adjust to the darkness and they will be able to see.
When she tries this experiment in a totally dark room, it turns out that her prediction was incorrect, and that she is unable to adjust to
the darkness. What should she do with her drawing?
Because her drawing does not accurately represent what really happens, she should make a new version of it that better predicts what she
actually experienced in the dark room.
Because her drawing was not useful in making an accurate prediction, she should discard it and not use drawings anymore to make
predictions.
Because her drawing represents how she thinks the world works, she should not change it but should be confident that she can use it to
make accurate predictions.
O
Because her drawing represents how she thinks the world works, she should use it to make other predictions and keep checking them until
one of them turns out to be correct
Answers
Answer:
A: Because her drawing does not accurately represent what really happens, she should make a new version of it that better predicts what she actually experienced in the dark room.
why are chemical equations balanced?A. To show that the total mass can only change when the total number of moles of substances changes B. To show that the total number of moles of substances does not changeC. To show that the mass of atoms in the products must equal the mass of atoms in the reactants D. To show that the number and type of each atom does not change
Answers
In Chemistry, we always have to balance the equations, in many topics within the subject of Chemistry, it is required to do that, this is because we have to account for every atom in the reaction, on both sides, reactant and product, the same number of atoms that are on the reactants side must be on the products side. Therefore, the best answer for this question will be letter D
The incomplete table below shows selected characteristics of gas laws. Name Variables Constants Equation ? Pressure, volume Temperature, moles of gas PV = k Charles’s law ? ? V = kT Gay-Lussac’s law ? ? ? Combined gas law ? ? StartFraction P Subscript 1 Baseline V Subscript 1 Over T Subscript 1 EndFraction = StartFraction P Subscript 2 Baseline V Subscript 2 Over T Subscript 2 EndFraction What are the variables in Gay-Lussac’s law? pressure and volume pressure, temperature, and volume pressure and temperature volume, temperature, and moles of gas.
Answers
No. of moles of gas is constant at combined gas law and pressure, temperature and volume is variable.
What are gas laws?Gas laws tells about the behavior and characteristics of gas at different conditions.
Charles's Law:According to this law at constant pressure, volume of the gas is directly proportional to the temperature of the gas, and it is represent as:
V ∝ T or V = kT, where k = gas constant.
Gay Lussac's Law:According to this law pressure of the gas is directly proportional to the temperature of the gas, and it is represent as:
P ∝ T or P/T = k, where k = gas constant.
Boyle's Law:According to this law at constant temperature, pressure of the gas is inversely proportional to the volume of the gas, and it is represent as:
P ∝ 1/V or PV = k, where k = gas constant.
Combined gas law:Combined gas law is the combination of all three above laws at constant moles of gas and it is represented as:
PV/T = k.
Hence, pressure and temperature is variables at Gay Lussac's Law.
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Answer:
c
Explanation:
Which force prevents protons from repelling each other inside a nucleus?
the gravitational force
the weak nuclear force
the electromagnetic force
the strong nuclear force
Answers
Which force prevents protons from repelling each other inside a nucleus?
the gravitational force
the weak nuclear force
the electromagnetic force
the strong nuclear force
The force prevents protons from repelling each other inside a nucleus will be "the strong nuclear force".
What is nucleus?A central part around which other parts have been grouped or gathered is referred to as a nucleus; or core. The core of the club was made up of a few devoted friends.
What is nuclear force ?The force that holds protons as well as neutrons in a nucleus together would be known as the nuclear force.
The strong nuclear force across protons but also neutrons displaces the electromagnetic force of repulsion amongst positive protons in the nucleus.
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Dr. Michelle Wang at Cornell University studies DNA replication and protein synthesis. Her group researches how a protein called helicase unzips the DNA strand.
After DNA is unzipped, what is the next step in DNA replication?
A. Messenger RNA forms along the exposed DNA bases.
B. A chromosome with two identical strands of DNA is formed.
C. Nitrogen bases pair up with the DNA strands.
D. Ribosomes attach to DNA and move along the strand.
Answers
Answer:
C. Nitrogen bases pair up with the DNA strands.
Explanation:
The correct option would be that nitrogen bases pair up with DNA strands.
DNA replication is a process during which a DNA molecule makes a copy of itself. It represents one of the major processes of gene expression.
DNA replication happens in several steps and it involves several important enzymes: The steps can be summarized in chronological order as follows:
The double helix structure of the DNA is first unwound using a helicase enzyme.A short RNA sequence known as primer binds to each DNA strand. Binding is done at a single site on the leading strand while it is done at multiple sites on the lagging strand.An enzyme known as DNA polymerase then elongates the primers by adding nucleotide bases to grow new strands.Once elongation is complete, the primer disengage and the RNA nucleotide bases are replaced DNA equivalence, the okazaki fragments of the lagging strands is joined by a ligase, the nely synthesized strands are proofread and each strand winds up to their respective parent strand.Hence, the correct option would be that nitrogen bases pair up with the DNA strand.
Correct option: C.
A carbohydrate chemist plans to use blocking groups and activating groups in a research project. What type of experiment is the chemist likely planning?
a. polysaccharide hydrolysis
b. exhaustive methylation
c. solid-phase oligosaccharide synthesis
d. liquid chromatography mass spectrometry/mass spectrometry analysis
e. nuclear magnetic resonance analysis
Answers
The chemist is likely planning a solid-phase oligosaccharide synthesis experiment.
Solid-phase oligosaccharide synthesis involves the stepwise assembly of carbohydrate chains on a solid support using blocking groups and activating groups. The blocking groups protect specific functional groups to ensure selective reactions, while the activating groups enhance the reactivity of certain functional groups during the synthesis process. This method allows for the controlled and sequential addition of monosaccharide units to build up complex oligosaccharide structures. The resulting oligosaccharides can then be analyzed using various techniques such as nuclear magnetic resonance (NMR) analysis, liquid chromatography mass spectrometry/mass spectrometry (LC-MS/MS) analysis, or other analytical methods to characterize their structure and properties.
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if there is 5.0x10^-6 grams of As in 1200 grams of drinking water, what is the concentration of As in ppm?
Answers
The concentration in ppm is 5.0 ppm.
What is the ppm unit?Ppm stands for "parts per million." It is a unit of measurement that is used to express the concentration of a substance in a mixture. In ppm, the amount of a substance is expressed as the number of parts of the substance per million parts of the mixture.
It is important to note that ppm is a relatively small unit of measurement, and that concentrations in the range of thousands or even millions of ppm can still be harmful to humans and the environment.
Given that the unit microgram/ gram is the same as the ppm then we have that the concentration could be 5.0μg/g or 5.0 ppm
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gaseous ethane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . suppose 8.12 g of ethane is mixed with 13. g of oxygen. calculate the maximum mass of carbon dioxide that could be produced by the chemical reaction. be sure your answer has the correct number of significant digits.
Answers
Ethane is the limiting reactant, so no mass of ethane will be left over by the chemical reaction. All the mass will react, the 8.1 grams of ethane.
How much grams of ethane will react, explain.
First of all, we need to determine the reaction and the limiting reactant to work with the stoichiometry.
The equation is: 2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O
We define the moles of the reactants:
8.12 g / 30 g/mol = 0.270 moles of ethane
13g / 32 g/mol = 0.406 moles of oxygen
To determine the limiting reactant, we start with oxygen:
7 moles of O₂ can react with 2 moles of ethane
Then, 0.406 moles of O₂ will react with (0.406 . 2) / 7= 0.116 moles of ethane.
We do not have enough ethane, just only 0.07 moles to react.
Ethane is the limiting reactant, so no mass of ethane will be left over by the chemical reaction. All the mass will react, the 8.12grams of ethane.
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the figures represent the change in concentration of a over time for the reaction aa products. based on the half-life represented here, what is the order of the reaction?
Answers
The reaction is a first-order reaction with respect to a. This means that the rate of the reaction is directly proportional to the concentration of a. As the concentration of a decreases, the rate of the reaction also decreases.
In order to determine the order of the reaction, we need to first understand what the half-life represents. Half-life is the time taken for the concentration of a reactant to reduce by half its initial concentration. The half-life of a first-order reaction is independent of the initial concentration of the reactant.
Looking at the figures, we can see that the half-life of the reaction is constant. This indicates that the reaction follows a first-order reaction. In a first-order reaction, the rate of reaction is directly proportional to the concentration of one of the reactants.
In this case, the concentration of a is decreasing with time. Therefore, the reaction is a first-order reaction with respect to a. This means that the rate of the reaction is directly proportional to the concentration of a. As the concentration of a decreases, the rate of the reaction also decreases.
In conclusion, based on the constant half-life represented in the figures, the order of the reaction is first-order with respect to a. This means that the rate of the reaction is directly proportional to the concentration of a. The figures provide us with important information to determine the order of the reaction and its kinetics.
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How to find the partial pressure of a gas.
Answers
Answer:
The total pressure of a mixture of gases can be defined as the sum of the pressures of each individual gas: Ptotal=P1+P2+… +Pn. + P n . The partial pressure of an individual gas is equal to the total pressure multiplied by the mole fraction of that gas.
Using diving terms, partial pressure is calculated as: partial pressure = (total absolute pressure) × (volume fraction of gas component) For the component gas "i": pi = P × F.
Simon has collected three samples from the coral reef where he observes marine life. He must determine whether each one is a pure substance or a mixture.
A 4-column table with 3 rows. The first column has entries sample A, sample B, sample C. The second column labeled appearance has entries clear liquid, clear blue liquid, opaque whitish liquid. The third column labeled when heated has entries evaporates completely at 70 degrees C, boils at 90 degrees Cleaving blue crystals behind, boils at 100 degrees leaving white crystals behind. The fourth column labeled when left over time has entries appearance does not change, appearance does not change, dust appears to settle at the bottom.
Sample A is a
, Sample B is a
, and Sample C is a
.
Answers
Answer:
SAMPLE A - pure substance.
SAMPLE B - homogeneous mixture.
SAMPLE C - heterogeneous mixture.
Explanation:
Answer:
pure substance.
homogeneous mixture.
heterogeneous mixture.
Explanation:
what safety equipment do you need if you are working with a strong base
Answers
Answer:
Closed-toe shoes, long pants, a lab coat, safety glasses with side shields or splash goggles, and gloves.
Explanation:
PLZ HELP!!! QUESTIONS ARE BELOW!!! :D PLZ COMPLETELY ANSWER THE QUESTIONS WITH A GOOD ANSWER :)
Answers
Answer: sorry its lagging i hope this help fore 18.. =D
Explanation:
n,s is repeating the cycle of the inside
Answer/Explanation:
18, a,
I believe the n, and s represents North, South, or just the way the arrows are rotating repeatedly.
18, b,
The phenomenon re-occurring shows the alignment of magnetic dipoles with in a magnet, like inside. The arrows show a direction in the line with an external magnetic field in a way that it can produce its own magnetic fields that seem to travel from North to the South.
18, c,
Incorrect. Refrigerator magnets have multiple layers of magnification, they use opposite polarities to stay this way. If he puts the magnet sideways it may stick to the fridge
~ LadyBrain
Calculate the number of
electrons in p orbitals in 10.0 g
H7- ion in the ground state.
Answers
The H7- ion has one more electron than a neutral hydrogen atom (H), which has an electron configuration of 1s1.
Adding one electron to this configuration results in 1s2, which is the electron configuration of the H- ion. However, the H7- ion has seven extra electrons compared to a neutral hydrogen atom. We can fill these electrons in the following order:
1s2 2s2 2p3
The three electrons in the 2p subshell are in p orbitals. Therefore, the number of electrons in p orbitals in the H7- ion is 3.
To calculate the number of moles of H7- in 10.0 g, we first need to convert the mass to moles using the molar mass of H7-. The molar mass of H7- is: (7 x 1.00794 g/mol) + 1.00794 g/mol = 8.05558 g/mol
Therefore, the number of moles of H7- in 10.0 g is:
10.0 g / 8.05558 g/mol = 1.2412 mol
Finally, we can calculate the total number of electrons in p orbitals in 10.0 g of H7- ion in the ground state:
3 electrons/pair x 1 pair/ion x Avogadro's number x 1.2412 mol = 2.117 x 10^24 electrons
Therefore, there are approximately 2.117 x 10^24 electrons in p orbitals in 10.0 g of H7- ion in the ground state.
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Place the events of early european and asian trade in chronological order.1. Chinese traders established strong trade routes around the world2. Europeans wanted access to Chinese commodities3. China demanded gold as payment form European countries4. European countries plundered the Americas for gold
Answers
The chronological order of events in early European and Asian trade are:
Chinese traders established strong trade routes around the worldEuropeans wanted access to Chinese commoditiesChina demanded gold as payment form European countriesEuropean countries plundered the Americas for goldThe early European and Asian trade was characterized by the establishment of strong trade routes by the Chinese traders. This was a result of their desire to access Chinese commodities that were highly valued. In exchange for these goods, European countries were required to pay in gold which was seen as a valuable commodity by the Chinese.
As a result the European nations plundered the Americas in search of gold to trade with the Chinese. The events that took place in early European and Asian trade illustrate the significance of trade and commerce in the history of human civilization.It emphasizes the human desire for riches, power & status as well as the extent people will go to attain these things.
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HELP ME ASAPPP plsss
Answers
1. Which of the following is not among the first twenty elements? A. Chlorine B. Beryllium C. Iron D. Calcium 2. The number of atoms in one mole of an element is referred to as A. molecularity B. chemical symbol C. atomicity D. chemical element 3. What is the chemical symbol of Aluminum? A. AL B. Al C. aL D. al. 4. Which of the following is a heterogeneous mixture? A. Soft drink B. Air C. Flood C. Solution salt 5. Which of the following is false about mixtures? A. They can easily be separated by Chemical method B. They are not represented by chemical formula C. They can be homogenous or heterogeneous D. The constituents are physically combined 6. Which of the following elements is diatomic? A. Sodium B. Potassium C. Helium D. Oxygen 7. A diatomic element has ___________ number of atoms in one molecule of its element. A. one. B. two. C. three. D. four. 8. Which of the following is an example of a colloidal solution? A. Chalk in water B. Sand in water C. Sugar solution D. Solution of eggwhite 9. A mixture whose constituents are uniformly mixed is referred to as a A. homogeneous mixture B. suspension C. heterogeneous mixture D. colloidal solution 10. _____________ is a force that opposes motion when two surfaces are in contact with each other. A. Movement B. Pressure C. Friction D. gravity 11. _____________ is a substance, which cannot be split or broken down into any simpler form by an ordinary chemical process. A. Mixture B. Element C. Compound D. Metals. 12. Alloys are best classified as A. elements B. compounds C. mixtures D. non-metals 13. A type of force which occurs when a body moves constantly over another body is the _______ A. static force B. dynamic force C. magnetic force D. frictional force. 14. Which of the following is NOT a characteristic of friction? A. The ratio of the frictional force and the normal reaction is constant. B. The frictional force is always equal to the force applied through weight. C. Static frictional force is independent of the surface area in contact. D. Friction supports motion. 15. Use of ball or roller bearing on a turning wheel of a machine A. can cause wear and tear of the wheel B. reduces friction between the wheel and the body parts of the machine C. decreases the efficiency of the machine. D. hinders the productivity of the machine. 16. Another way of reducing friction is by A. painting B. alloying C. oiling D. braising 17. A block of wood weighs 4N lies on a horizontal table. Calculate the frictional force between the table and the wood if the coefficient of the static friction is 0.5. A. 1.0N B. 0.2N C. 2.0N D. 0.4N 18. A body of mass 2kg was moved uniformly by a force of 15N, if acceleration due to gravity is 15m/s, determine the coefficient of dynamic friction. A. 0.75 B. 1.5 C. 0.5 D. 1.75 19. The symbol for Beryllium is A. B. B. Be C. Bl D. Bm 20. K is the symbol of A. Calcium B. Chromium C. Potassium D. Krypton
Answers
Answer:
c. iron
Explanation:
iron's atomic number is 26
How many feet are in i yard
Answers
Answer:
3 feet is in one yard, which is 36 inches.
A solution contains 0.08 M acetic acid, HC 2 H 3 O 2 (K a = 1.7 × 10 −5 at 25°C), and 0.15 M sodium acetate, NaC 2 H 3 O 2 . What is the pH of the solution at 25°C? HC2H3O2(aq) + HOH(liq) <=> H3O+(aq) + C2H3O2-(aq) a. 7.05 b. 4.28 c. 5.04 d. 6.02 e.3.86
Answers
The given reaction is:HC2H3O2(aq) + HOH(liq) ⇌ H3O+(aq) + C2H3O2-(aq)The acid dissociation constant expression of HC2H3O2 is:K a = [H3O+][C2H3O2-] / [HC2H3O2]Given that,Concentration of HC2H3O2 = 0.08 MConcentration of NaC2H3O2 = 0.15 MKa = 1.7 × 10−5at 25°CInitially, HC2H3O2 is dissociated to produce H3O+and C2H3O2−ions.
The concentration of C2H3O2- ions increases because NaC2H3O2 is a salt of a weak acid and its solution hydrolyzes according to the following equation:NaC2H3O2(aq) + HOH(liq) ⇌ Na+(aq) + OH-(aq) + HC2H3O2-(aq)The chemical equation is shown below:HC2H3O2(aq) + HOH(liq) ⇌ H3O+(aq) + C2H3O2-(aq) Initial 0.08 0.00 0.00Change -x +x +xEquilibrium 0.08 - x x xNow, the expression for Ka is given as,
K a = [H3O+][C2H3O2-] / [HC2H3O2]1.7 × 10−5= (x)(x) / (0.08 - x)Since x << 0.08, therefore0.08 - x ≈ 0.08Applying the approximation gives1.7 × 10−5= (x)2 / (0.08)Taking the square root of both sides givesx = 1.7 × 10−3MNow, pH = -log[H3O+]pH = -log(1.7 × 10−3)pH = 2.77The pH of the solution is 2.77. Hence,
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What happens to the heat energy that leaves the milk?
Answers
Answer:
it gets cold or warm
Explanation:
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We have identified six types of solids (metallic, ionic, molecular, network, amorphous, alloys).
a Scoring: You must get all matches correct to get credit.
What particles make up each of these solids?
Clear All
metallic
ionic
molecular
network
amorphous
alloys lattice of metal atoms with other metal atoms in the lattice
positive and negative ions
molecules
metal atoms
covalently bonded networks with no long-range regularity
extended network of covalently bonded atoms
Answers
Particles make up each of these solids given below:
Metallic - Metal atom
Ionic - Positive and negative ions
Molecular - Molecules
Network - extended network of covalently bonded atom
Amorphous - Covalently bonded network with no
long-range regularity.
Alloy's - Lattice of metal atom with other metal atom
in the lattice.
What are the various solids' five different types?Solids fall into two main categories: crystalline and amorphous. Amorphous solids are disordered, whereas crystalline solids are well ordered at the atomic level. Crystalline solids come in four different varieties: molecular solids, network solids, ionic solids, and metallic solids.
Covalent, ionic, and molecular solids all share a similar property. These solids' electrons are localized, with very few exceptions. They are either found on an atom or an ion, or they are shared by two atoms or a small number of atoms.
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Could y’all help me name the molecular shapes?
Answers
Explanation:
1) Carbon dioxide
2) methane
3) methanal
4) borane
5) Ozone
6) 1,1,1,1-tetrachloro methane
7) ammonia
8) water
after ten years, 75 grams remain of a sample that was
originally 100 grams of some unknown radio isotope. find the half
life for this radio isotope
Answers
The half-life of the radioisotope, calculated based on the given information that after ten years only 75 grams remain from an initial 100 grams, is approximately 28.97 years.
To find the half-life of the radioisotope, we can use the formula for exponential decay:
N(t) = N₀ × (1/2)^(t / T₁/₂)
T₁/₂ is the half-life of the substance.
In this case, we know that the initial amount N₀ is 100 grams, and after ten years (t = 10), 75 grams remain (N(t) = 75 grams).
We can plug these values into the equation and solve for T₁/₂:
75 = 100 × (1/2)^(10 / T₁/₂)
Dividing both sides of the equation by 100:
0.75 = (1/2)^(10 / T₁/₂)
Taking the logarithm (base 2) of both sides to isolate the exponent:
log₂(0.75) = (10 / T₁/₂) × log₂(1/2)
Using the property log₂(a^b) = b × log₂(a):
log₂(0.75) = -10 / T₁/₂
Rearranging the equation:
T₁/₂ = -10 / log₂(0.75)
Using a calculator to evaluate the logarithm and perform the division:
T₁/₂ ≈ 29.13 years
Therefore, the half-life of the radioisotope is approximately 28.97 years.
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differentiate between Acidic radical and basic radical
Answers
Explanation:
Acidic radical
Acid radical is the ion formed after the removal of Hydrogen ion (H+) from an acid. Example: When H2SO4 loses H+ ion, it forms HSO4− which is an acid radical.
Basic radical
The ion formed after the removal of hydroxide ion (OH−) from a base is known as basic radical.
how many nitrogen atoms should appear on the right side of this equation 2AgNO3+Cu=?
Answers
Answer:
One.
Explanation:
Both sides of the equation need 2 Silver atoms, 1 Nitrogen, 3 Oxygen and 1 Copper to be balanced which is the same as the side of reactants.