Answer:
H2O
Explanation:
H2O melts at 0 Celsius while everything else melts at a lower degree temp
The H+ ion concentration of an aqueous solution is 1.0x10-8 M. What is the OH- ion concentration in the solution? Is this solution acidic, neutral, or basic?
Taking into account the definition of pH and pOH, the OH- ion concentration in the solution is 1×10⁻⁶ M and the solution is basic.
Definition of pHThe pH is a coefficient that indicates the degree of acidity or basicity of an aqueous solution and indicates the amount of hydrogen ions present in a solution or substance.
The pH is defined as:
pH= - log [H⁺]= - log [H₃O⁺]
Neutral pH is 7: if the number is higher, the solution is basic, and if it is lower, it is acidic.
Definition of pOHSimilarly, pOH indicates the amount of hydroxyl ions and is expressed as the logarithm of the concentration of OH⁻ ions, with the sign changed:
pOH= - log [OH⁻]
Relationship between pH and pOHThe relationship between pH and pOH can be established as:
pOH + pH= 14
[OH⁻] in this caseBeing [H⁺]=1×10⁻⁸ M, the pH is calculated as:
pH= - log (1×10⁻⁸ M)
Solving:
pH= 8
The solution is basic because the pH is greater than 7.
Being pH= 8, pOH is calculated as:
pOH + 8= 14
pOH= 14 - 8
pOH= 6
Replacing in the definition of pOH the concentration of OH⁻ ions is obtained:
- log [OH⁻]= 6
Solving:
[OH⁻]= 10⁻⁶
[OH⁻]=1×10⁻⁶ M
In summary, the [OH⁻] is 1×10⁻⁶ M.
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What is the chemical equation of table salt
Answer: NaCl
Explanation:
Table salt is made up of 1 atom of sodium (Na) and 1 atom of chlorine (Cl)
Which of the following has the largest ionization energy?
Responses
Na
K
Be
Ba
Answer:
k
Explanation:
ionization energy is the minimum energy required to remove an electron from the outermost energy level of an atom
so the electrons in beryllium are closer to the nucleus therefore more energy is required to loose the electrons because the two electrons are strongly held by the nucleus
What else affects how you will grow and develop
There are many factors that determine how a person can grow and develop, such as environmental factors, nutrition, genetics, and a good upbringing for better mental and physical development.
What factors contribute to a person's development?Many factors are required for a person's proper development, both mentally and physically, such as a child's upbringing, which helps a person make the right decisions in life, and nutrition and good genetics, which make a person physically strong.
Hence, there are many factors that determine how a person can grow and develop, such as environmental factors, nutrition, genetics, and a good upbringing for better mental and physical development.
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Consider the ions Ag^+ and S^2-.
How many protons and electrons does each of these ions possess?
protons in Ag^+
electrons in Ag^+
protons in S^2-
electrons in s^2-
[tex]Ag^+[/tex] would contain 46 electrons and 47 protons.
[tex]S^{2-[/tex] would contain 18 electrons and 16 protons.
Number of electrons and protons in ionsThe neutral ions of atoms have an equal number of electrons and protons. Since electrons are negatively charged and protons are positively charged, the number of negative and positive charges balances each other.
The atomic number of atoms is the number of protons in the atoms. Thus, Ag has a proton and electron number of 47 while S has 16 for each.
In order to form [tex]Ag^+[/tex], Ag will lose an electron. Thus the proton number remains at 47 while the electron number has been reduced to 46.
In order to form [tex]S^{2-[/tex], S will gain 2 electrons. Thus, the proton number remains at 16 while the electron number increases to 18.
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5.
How many moles are present in 2.50 x 10^23 molecules of C₂H6?
Mole (mol): the volume measured by the number of particles in a mole (6.02214 * 1023).
What is mole?The number of atoms in exactly 12 grams of pure carbon-12 is the molecular weight, or mole, and it has a value of one.
12.00 g C-12 is equal to 1 mol of C-12 atoms, or 6.022 x 1023 atoms.
The Avogadro's Number is the number of particles in a mole (6.0221421 x 1023).
6.022 ×1023 atoms
The same as one mole
6.022 ×1023 atoms
Conversion of Number of Atoms to Number of Molecules
Count the atoms in 2.45 mol of copper to determine its atomic weight.
The number of silver atoms in a silver ring is 1.1 x 1022. In the ring, how much silver is there in a mole?
2.45 mol Cu = 6.022 1023 atoms
1 mol equals 1.48 x 1024 atoms. Cu 1.1 1022 atoms 1 mol Ag = 1.8 10-2 mol with 6.022 1023 atoms.
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Choose all that apply please
Atom A could be strontium (Sr), oxygen (O), or aluminum (Al).
If both elements are member of Groups 1A-8A (not the Group B elements), indicate which of the following might be correct identities for each of these atoms?Strontium is an alkaline earth metal in group 2A of the periodic table, while oxygen and aluminum are both found in group 6A. Each of these elements has a Lewis Dot diagram with two electrons in the outer shell. Atom B could be tin (Sn), nitrogen (N), or phosphorous (P).Tin is a post-transition metal in group 14A, nitrogen is a non-metal in group 5A, and phosphorous is a non-metal in group 15A. All of these elements have five electrons in the outer shell, as shown in the Lewis Dot diagram. Each of these elements are appropriate for the given diagram and can be used to identify atom A and atom B.Yes, all of the choices you provided could be correct identities for the atoms shown in the Lewis Dot Diagram. Atom A, which has 2 dots in its outer shell, could be strontium (Sr) from Group 2A, oxygen (O) from Group 6A, or aluminum (Al) from Group 3A. Atom B, which has 5 dots in its outer shell, could be tin (Sn) from Group 4A, nitrogen (N) from Group 5A, or phosphorous (P) from Group 5A.The Lewis Dot Diagram is a visual representation of the electrons in a chemical bond. It is used to determine the number of valence electrons, which then helps to identify the elements in the bond. The number of dots around the element symbol in the Lewis Dot Diagram represent the number of valence electrons in the atom's outer shell.To learn more about The Lewis Dot Diagram refer to:
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If you leave your hand on a lightbulb while it's turn on eventually your hand get hot why is happening
If you leave your hand on a lightbulb while it is turned on, your hand will eventually get hot because heat will be transferred from the bulb to your hand by conduction.
What is conduction?Conduction is a heat transfer process through a solid body. In other words, it is a process whereby heat is transmitted through the movement of particles that are in contact with one another.
When a lightbulb is turned on, electrical energy is converted into light energy and this lights up the bulb. Some of the energy of light is also converted to heat and this makes the lightbulb heat up.
Thus, when you leave your hand on a lightbulb while it is on, heat will be transferred to it by direct contact, a method known as conduction.
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if we toss two ballanced dice, and let A be the event that the sum of the face values of two dice is 8, and B be the event that the face value of the first one is 3.calculate P(A/B).
Answer:
the graph shows that f(x)=[1/3]×
Which of the following choices could be an isomer of a compound with an empirical formula of C₂H₆O₂?
The compound that could be the isomer of C₂H₆O₂ is CHO. Option A
What is an isomer?We know that an isomer is the kind of compound that has the same molecular formula but does not have the same structural formula. The implication of this is that we would have to compounds that just have the same kind of the atoms but the arrangement of the atoms would not be the same.
We can then say that the isomers that we are talking about in the context of the question that we are trying to deal with here is the kind of isomers that do not have the same way in which the atoms of the elements that make up the compounds have been arranged in the compounds that are under study.
Thus, when we look up the compounds, we can see that the only empirical formula that is close to that of the compound that we have in the question as shown is the compound with the empirical formula CHO.
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Missing parts;
Which of the following choices could be an isomer of a compound with an empirical formula of C₄H₁₀O₃?
CHO
CH₂O
C₈H₂₀O₆
C₅H₁₁O₄
In the second experiment, bacteria are grown in a culture medium depleted of Na+. Under these conditions, when P3 is inactivated and a drug stimulates the activity of P1, the pH of the culture medium decreases unless a chelating agent (trapping Na+) is added to the culture medium.
Complete the following sentences. (2 attempts)
From the second experiment you conclude that in the presence of substrate S, the ___(A)___ results in the P1-dependent ____(B)____ of Na+ outside the bacteria. The Na+ ____(C)____ via P2 and this transport is coupled with H+ ___(D)___ leading to the formation of a proton motive force/Na+ gradient. The extracellular ___(E)___ re-enters the cell via P3 leading to ATP synthesis.
Options:
A: decarboxylation, carboxylation
B: export, import
C: re-enters, exits
D: export, import
E: H+, Na+
In the second experiment, bacteria are grown in a culture medium depleted of Na+. the culture medium is the gel or the liquid contains the nutrients and it is used to grow the bacteria.
In the experiment, The bacteria is grown in the culture medium. we conclude that , in the presence of the substrate S, the decarboxylation results in the P1 - dependent export of the Na⁺ outside the bacteria. The Na⁺ re-enters via P2 and this transport is coupled with the H⁺ exports leading to the formation of the proton motive force/ Na⁺ gradient.
The extracellular H⁺ reenters the cell via P3 leading to the ATP synthesis.
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The second experiment involves the growth of bacteria in a medium that lacks Na+. The liquid or gel used as the culture medium includes nutrients and is used to cultivate microorganisms.
The bacteria is cultivated in the experiment's culture medium. We come to the conclusion that the decarboxylation causes the Na+ to be exported from the bacteria in a P1-dependent manner when the substrate S is present. The proton motive force/Na+ gradient is created when the Na+ re-enters through P2 and is transported together with the H+ exports. Through P3, extracellular H+ returns to the cell and triggers the creation of ATP.
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How many miles will a person run during a 20 kilometer race?
Answer:
They would run 12.4274 miles.
Answer:
Explanation:
12.4274 miles.
the answer is probably rounded, so 12.43 or 12.4
Which choice is equivalent to the quotient below?
100
√25
OA. 2
OB. √2
O C.
O D.
NOT NE
The quotient of the given mathematical problem is equal to 2. Therefore, option A is correct.
What is the quotient?In arithmetic, a quotient can be described as a quantity produced by the division of two numbers. The quotient has used throughout mathematics and is referred to as the integer part of a division or as a fraction or a ratio.
A rational number is the quotient of two integers when the denominator is non-zero.
A real number r is rational, it can be expressed as a quotient of two integers with a non-zero denominator.
Given a real number r, r is rational if and only if there exist integers a and b such that[tex]{\displaystyle r={\tfrac {a}{b}}}, {\displaystyle b\neq 0}[/tex]
Given, the division of √100/√25
We can write the [tex]\sqrt{100} =\sqrt{25\times 4} =\sqrt{25} \sqrt{4}[/tex]
Now, [tex]\displaystyle \frac{\sqrt{100}}{\sqrt{25}}= \frac {\sqrt{25}\times \sqrt{4} }{ \sqrt{25}} =\sqrt{4} =2[/tex]
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Please answer my question.
The absolute configuration of the highlighted compound is L. The IUPAC name of the given compound is 2,3 dibromo pentane.
What is IUPAC nomenclature ?Organic compounds are named based on certain rules by IUPAC. The chain name is based on the number of carbon atoms in the longest chain of the molecules.
The configuration in which the OH groups of the second carbon comes down is called D- configuration and if it is above the plane it is called L- configuration.
The given compound is in L configuration since the OH group of the second carbon is above the plane.
The IUPAC name of the given compound is 2,3 dibromo pentane. It contains 5 carbons in the longest chain and substituent at the second and third carbon.
The Fischer projection of the given compound is shown as below .
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The absolute configuration of given compound is S configuration. Absolute configuration is the stereochemical description of both the spatial arrangement.
What is absolute configuration?Absolute configuration is the stereochemical description of both the spatial arrangement of the atoms inside a chiral molecular unit (or group). Since carbon is linked to four distinct substituents in organic compounds, absolute configuration is frequently significant.
The arrow should resemble a clock face since the fourth primary concern atom is positioned at the back. It can be an R-enantiomer if it is moving clockwise and an S-enantiomer if it is moving counterclockwise. The absolute configuration of given compound is S configuration.
Therefore, the absolute configuration of given compound is S configuration.
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Draw the structure of 2-methylbutan-1-ol as displayed formula.
The structure of 2-methylbutan-1-ol as displayed formula is CH3-CH(OH)-CH2-CH3}
The image attached below as displayed formula.
What is 2-methylbutan-1-ol?Generally, 2-Methylbutan-1-ol is an alcohol with the molecular formula C5H10O. It is a clear, colorless liquid with a sweet, fruity odor. It is also known as isoamyl alcohol or 3-methylbutanol.
It is a common constituent of many essential oils and is used as a solvent and a flavoring agent.
It is classified as secondary alcohol because the hydroxyl group is attached to a carbon atom that is bonded to two other carbon atoms.
CH3-CH(OH)-CH2-CH3}
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5. Last year the US produced 1.84 X 1010 lbs of phosphoric acid to be used in the manufacture of fertilizer. The average cost of the acid is $318/ton. What was the total value of the phosphoric acid produced?
Last year the US produced 1.84 X 1010 lbs of phosphoric acid to be used in the manufacture of fertilizer. The average cost of the acid is $318/ton. The total value of the phosphoric acid produced is $ 2925600000.
What is the average cost ?The term average cost is defined as the ratio of total cost to the number of units of a good produced. It is mathematically expressed as AC = TC/Q.
The average cost of the acid = $318/ton
18.4 × 10⁹ lbs = ( 18.4 × 10⁹ ) / 2000 tons
Cost = [( 18.4 × 10⁹ ) / 2000 ] × 318
Cost = $ 2925600000
Thus, The average cost of the acid is $318/ton. The total value of the phosphoric acid produced is $ 2925600000.
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The structures of four complex ions (W, X, Y, and Z) are shown below: Determine which, if any, of these complex ions are (i) geometric isomers, (ii) optical isomers, (iii) identical, or (iv) not related to any of the others as an isomer.
X and Z are the same compounds while W and Y are geometric isomers.
What are isomers?We have to note that the term isomers has to do with the compounds that have the same molecular formula but not the same structural formula. The implication of these is that the number of atoms of each of the elements that are in the isomers is the same but the atom to atom connectivity of the atoms in the compounds would differ.
Having this in mind, we should give a good look to the structures that we have in the question that we have. We need to look closely to see if there is any kind of relationship between the molecules that have been shown.
We can already see that there are some of the complex ions that we can be able to regard as the geometric isomers of each other based on the appearance of the structures.
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the diagram show changes of state between solid, liquid and gas. The atoms of a substance lose energy during the change of state. Before the change, the atoms are close together but are able to slide pas one another
The change that has been described is shown as L.
What is the change of state?We know that the term change of state has to do with the process by which there is an alteration in the physical state that the material is found to be in. In this case, we have a situation in which at the beginning, the atoms are close together but are able to slide pass one another.
We know that the former state that has been described here is the solid state and the liquid state is that in which the arrow may be pointing towards in the diagram as shown.
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Missing parts;
The diagram shows changes of state between solid, liquid, and gas. The atoms of a substance gain energy during a change of state. Before the change, the atoms are close together and cannot slide past one another. After the change, the substance can fill its container.
Which arrow represents the change of state described above?
L
M
N
O
A 1.35 m aqueous solution of compound X had a boiling point of
101.4°C. Which one of the following could be compound X? The
boiling point elevation constant for water is 0.52°C/m.
A) CH3CH2OH
B) C6H12O6
C) Na3PO4
D) KCl
E) CaCl2
When you put it into a table and separate the variables, you'll get 0.80 molecules.
Answer: KCl
That is the correct answer on pearson
a useful scientific name must have two characteristics:
A useful scientific name must have two characteristics and these include the following:
GenusSpeciesWhat is a scientific name?In Science, a scientific name is sometimes referred to as binomial nomenclature, binominal nomenclature, or binary nomenclature and it can be defined as a formal system that is typically used for naming species of living organisms, especially by giving each a name that is composed of two (2) main parts i.e Genus and Species.
What is a species?In Science, a species simply refers to a biological classification of related organisms that look alike or have the same (similar) characteristics and they are capable of mating (breeding) with one another in a cycle (different seasons).
In this context, we can reasonably infer and logically deduce that both Genus and Species are the two (2) main characteristics which all useful scientific names must have.
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A gas exerts a force of 180N over an area of 36m² at a Volume of 340ml. Calculate the pressure of the gas at a Volume of 540L
Answer:
5 Pa
Explanation:
To solve this problem, we first need to convert the volume of the gas in milliliters to liters. There are 1000 milliliters in a liter, so we can multiply the volume of the gas in milliliters by 1/1000 to get its volume in liters. This gives us a volume of 0.34 liters.
The pressure of a gas is equal to the force it exerts per unit area. The unit of pressure is the pascal (Pa). In this case, the force of the gas is 180N and the area over which it is exerting this force is 36m², so the pressure of the gas is 180N/36m² = 5 Pa.
If we change the volume of the gas to 540 liters, the pressure will not change. This is because the pressure of a gas is dependent on the force it exerts and the area over which it is exerted, and not on the volume of the gas itself. The pressure of the gas will remain 5 Pa regardless of its volume.
superficial zone chondrocytes can get compacted under physiological loading: a multiscale finite element analysis.
a. true
b. false
The statement "Superficial zone chondrocytes can get compacted under physiological loading: a multiscale finite element analysis" is true.
Superficial zone chondrocytes are the most exposed to mechanical loading and are therefore at risk of being compacted under physiological loading. A multiscale finite element analysis can be used to model and predict the mechanical behavior of cartilage under physiological loading, allowing for a better understanding of the factors that affect its mechanical properties.
This means that chondrocytes in the superficial zone of cartilage are at risk of being compacted under the physiological loading that it experiences in everyday life. A multiscale finite element analysis can be used to model and predict the mechanical behavior of cartilage under physiological loading, allowing for a better understanding of the factors that affect its mechanical properties.
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Beryllium would have a strong affinity to bond with sulfur because Beryllium and sulfur could both become stable by the transfer of ONE electron from Beryllium to sulfur.
Question 8 options:
True
False
Question 9 (1 point)
In a diatomic molecule of oxygen (two oxygen's bonded together), this combination must be through sharing of electrons and thus a covalent bond.
Question 9 options:
True
False
Question 10 (1 point)
While drawing the Lewis structure between two Nitrogen's, you'd have to have EACH nitrogen donate 3 electrons to be shared, and thus a triple covalent bond would form between them.
Question 10 options:
True
False
There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, the given statement is true.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
Beryllium would have a strong affinity to bond with sulfur because Beryllium and sulfur could both become stable by the transfer of ONE electron from Beryllium to sulfur.
Therefore, the given statement is true.
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Hydrogen peroxide can be prepared by the reaction of barium peroxide with sulfuric acid according to the reaction
BaO2(s)+H2SO4(aq)⟶BaSO4(s)+H2O2(aq)
How many milliliters of 4.75 M H2SO4(aq) are needed to react completely with 16.1 g BaO2(s)?
I figured it out and the answer is 20.
Hydrogen peroxide can be prepared by the reaction of barium peroxide with sulfuric acid, so, 13.26 ml of 4.75 M H₂SO₄ (aq) are needed to react completely with 16.1 g BaO₂ (s).
What is the significance of the reaction?In the reaction, there is 1 mole of BaO₂(s) that reacts with 1 mole of H₂SO₄(aq), so the moles of BaO₂ are 0.063 moles because the mass of this is 16.1 and the molar mass is 253.34 g/mol. So here, the same mole that is 0.063 is for H₂SO₄, and the volume of H₂SO₄ is 13.26 ml, which is gotten from the moles of solute/molarity that are 0.063 moles/ 4.75 M.
Hence, hydrogen peroxide can be prepared by the reaction of barium peroxide with sulfuric acid, so, 13.26 ml of 4.75 M H₂SO₄ (aq) are needed to react completely with 16.1 g BaO₂ (s).
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A scientist did a test to compare two substances: substance Q and substance R. At room temperature, both substances are liquid. When the scientist transferred the same amount of energy out of both substances, only one substance changed phase while the other did not. Which substance changed phase, and how did it change?
The substance that changed phase would have less heat capacity than the other thus the bonds in it were broken more easily.
What is a phase change?We have to note that the phase change has to do with the conversion of a liquid to a solid or the conversion of a liquid to a gas. A phase is essentially a given state of matter.
In the case of the question that we have here, we are told that the two substances that are tested are liquids. It is now clear that the substance that changed phase would have a lower heat capacity.
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Need help with this question ♂️
The most likely compound for the curve labeled C is sodium chloride according to the concept of solubility.
What is solubility?
Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.
The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible. The dependency of solubility on various factors is due to interactions between the particles, molecule or ions.
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Draw the structures of the following molecules.
1. 1-chloro-1-butyne
2. (Z)-4-Bromo-3-methyl-3-penten-1-yne
3. 4-Hexyn-1-ol
The structures of the compounds have been found in the image attached.
What is the structures?We know that the structure of a molecule would have to do with the way and the manner in which a compound can be written in on paper. It is a kind of a visible representation of the compound.
As such all of the atoms in the compound as well as the groups that we find in the molecule can well be represented in the structure of the compound when it has been shown as we have in the images that are attached to the answer below.
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1. If a reaction starts with 5 atoms of Hydrogen, how many will there be
after they react with 10 atoms of Oxygen?
Answer:
When a chemical reaction starts with 5 atoms of hydrogen, and the reaction goes into completion, it must give us 5 atoms of hydrogen.
This is in compliance with the law of conservation of mass which states that "in a chemical reaction, matter is neither created nor destroyed but converted from one form to another".
In chemical reactions, bonds are broken and new compounds are formed in the process. The same number of species at the start and end of the reaction must still be the same.
Explanation:
The key to predicting precipitation reactions is understanding that only :
The key to predicting precipitation reactions is understanding the solubility rules of the reactants.
Solubility rules determine which ions are soluble in water and which ions form an insoluble precipitate when combined in aqueous solution. These rules can be used to predict whether a reaction will result in a precipitate or not.
Predicting Precipitation Reactions: A Guide to Understanding Solubility RulesPrecipitation reactions are a common type of chemical reaction which involve two reactants combining together in an aqueous solution to form an insoluble precipitate. In order to predict whether a reaction will form a precipitate or not, one must understand the solubility rules of the reactants. This essay will discuss what solubility rules are, how they are used to predict precipitation reactions, and how to apply them in practice.
Solubility rules are a set of guidelines which determine which ions are soluble in water and which ions form an insoluble precipitate when combined in aqueous solution. Generally, two categories of ions are considered: those that are soluble in water, and those that are insoluble.
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What is the total number of moles of NO produced when 1 mole of O2 is completely consumed
Answer:
the answer is 3
Explanation:
When you put it into a table and separate the variables, you'll get 0.80 molecules. (can you give me Brainliest? )
