Let's begin with a pH of 1. This results in a neutral protonated carboxyl and two positive protonated five-amino-acids peptides for a net charge of +2, as this pH is below any given pKa value.
What does a peptide charge look like at various pH levels?What are the following five-amino-acid peptides' net charges at ph 1.0?
The peptide has a net charge of -1 above a pH of about 8 and +1 below a pH of about 3.5.
What is the net charge of arginine at pH 1?+2 Since the pKa value of the amino group is higher than the pH, we anticipate that it will be protonated. The R-group is also protonated. Positive charges are present on the amino and R-group.
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the aromatic region 7-8 ppm of the proton NMR spectrum of compounds with para disubstituted benzene rings such as phenacetin is often referred to as an AB pattern. this pattern has two doublet signals coupled to each other. explain the origin of this AB pattern
Because there are two mutually connected nuclei in aromatic ring of phenacetin that are not related to other protons and whose shift differences are equal to coupling constant, ring displays AB pattern.
Why do protons exist on benzene deshielded?The ring protons in benzene experience deshielding because their chemical shift is 7.3 parts per million (ppm) as opposed to 5.6 for the vinylic proton in cyclohexene, and because the induced magnetic field outside the ring has the same direction as the external field.
What frequency range does proton NMR show benzene protons?Around 6–8 ppm of benzene contains protons. Due to the deshielding action of the aromatic ring, this is higher than the protons in other hydrocarbons like alkanes and alkenes.
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Answer:Due to the presence of two mutually connected nuclei and a shift difference equal to the coupling constant, the aromatic ring of phenacetin exhibits the AB pattern.
Explanation:
T/F a branched molecular structure is stronger in the solid state and more viscous in the molten state than a linear structure for the same polymer:
The statement is True that a branched molecular structure is stronger in the solid state and more viscous in the molten state than a linear structure for the same polymer.
Cross-linked polymers are considered to be very strong and heat-resistant hence they can be used effectively for this purpose.
A polymer is obtained by the combination of small molecules called monomers. A polymer essentially consists of a regular repeating unit of small molecules called monomers.
A cross-linked polymer is actually a polymer in which covalent bonds are used to join polymer chains very together. Cross-linked polymers are strong and heat - resistant. Hence they can be used for this purpose.
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If HCl is added to a beaker of water
Does this make an acid, base, or neutral?
Why?
What range on the pH scale would this measure?
If HCl is added to a beaker of water, HCl will dissociate into ions and show acidic character. pH will be in the range of 0-7.
What is acid?Any material that when dissolved in water has an acidic taste, may alter the color of some indicators (such as reddening blue litmus paper), can react with some metals (such as iron) to release hydrogen, can combine with bases to produce salts, and can accelerate some chemical reactions.
Acids are examples of both organic chemicals that belong towards the carboxylic acid, sulfonate, as well as phenol groups as well as the inorganic substances classified as the mineral acids, such as sulfuric, nitric, hydrochloric, as well as phosphoric acids. If HCl is added to a beaker of water, HCl will dissociate into ions and show acidic character. pH will be in the range of 0-7.
Therefore, HCl will dissociate into ions and show acidic character. pH will be in the range of 0-7.
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which of the following options correctly describe how to calculate a molecular or formula mass for a compound? select all that apply.
Cations and anions have atomic masses that are almost identical to those of neutral elements. Ca(NO3)2 is an example of a formula. The formula/molecular mass is determined by adding the masses of the constituent elements in the right ratios.
How are the molecular mass and formula calculated?
By applying the relevant compound's chemical formula and atomic masses learned from the periodic table. The compound's formula or molecular mass is determined by adding the atomic masses in the right ratios. Which of the following statements best encapsulates the proper way to name a binary covalent compound? - With its roots and the prefix -ide, the second element is given a name.
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Typical outdoor air also has water vapor, H2O(g), mixed in with the other gases. Consider the molar mass and density of humid air compared to dry air.question: The molar mass of humid air is (less than / equal to / greater than) the molar mass of dry air. question: The density of humid air is (less than / equal to / greater than) the density of dry air
Dry air has a density of 1.3 g/L and a molar mass of 28.96 g/mol at 0 °C and 1.0 atm, respectively.
What in chemistry is a molar mass?Atomic mass M is the mass of a chemical compound divided by the molecular weight of the material. The formula for this is MB = m/nB, where m is the total mass of a sample of a pure substance and nB is the molecular weight of substance B.
Dry air contains 78% N2, 21% O2 and 1% Ar
Molar mass N2 = 28 g/mol
Molar mass O2 = 32 g/mol
Molar mass Ar = 39.95 g/mol
Calculate molar mass
Molar mass = 0.78 * 28 + 0.21*32 + 0.01 * 39.95
Molar mass = 28.96 g/mol
Calculate the density
At STP Molar volume is 22.4 mol/L
Density = molar mass / molar volume
Density = 28.96 / 22.4
Density = 1.3 g/L
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Question:
Map Sapling Learning Dry air (0% humidity) is approximately 78% N2, 21% O2, and 1% Ar by moles. Calculate the molar mass and density of dry air at 0 °C and 1.0 atm. Assume ideal behavior and use two significant figures in your answers Number Number g/ mol molar mass density Typical outdoor air also has water vapor, H20 (g), mixed in with the other gases. Consider the molar mass and density of humid air compared to dry air E the molar mass of dry air The molar mass of humid air is Select answer The density of humid air is Select answer the density of dry air. greater than equal to less than O Previous Next Check Answer Give Up & View Solution
chapter 9 review stoichiometry for each balanced equation identify the limiting reagent for the given combination of reactants
By dividing the number of moles of each reactant in the balanced chemical equation by its stoichiometric coefficient, you may determine which reactant is the limiting one.
When 5.00 g of mg react with 6.00 g of HCl, what is the limiting agent?Since just 2.00 g of Mg is needed for 6.00 g of HCl to react, the Mg (5.00 g) is excessive and HCl is the limiting reactant. We use the amount of HCl since it is the limiting reactant to calculate the number of grams of H2 that will be generated.
What reactant in a stoichiometric equation is the limiting one?The limiting reactant, also known as the limiting reagent, is the reactant that is used first during a chemical reaction, hence restricting the amount of product that can be produced.
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describe how this quantum energy model can account for the bright line/emission spectra that you see in this lab.
The bright line or emission spectra observed in a laboratory can be explained by the quantum energy model. In this model, atoms or molecules can only have specific, discrete energy levels.
When atoms are excited, for example by heating, electrons can jump to higher energy levels. When these electrons then drop back down to lower energy levels, they emit photons with specific energies, corresponding to the energy difference between the two levels. The photons emitted by the excited atoms are in the form of bright lines or emission spectra. This is why each element has its own unique set of emission lines, corresponding to its specific energy level transitions. The quantum energy model can thus account for the observation of bright lines or emission spectra in a laboratory.
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A 28.25 g sample of a metal, initially at 100.0⁰C, is mixed with 100.mL of water, initially at 24.5⁰C, in a coffee cup calorimeter. The water/metal mixture reaches an equilibrium temperature of 28.0⁰C. Calculate the specific heat of this metal in cal/g⁰C .
0.719 cal /g⁰ C is the specific heat of this metal. Calorimeters come in a wide range of designs. A common kind is a "bomb calorimeter,"
What is calorimeter?Calorimeter, a tool for estimating a material's heat capacity and measuring the heat produced during a physical, electrical, as well as chemical process.
Calorimeters come in a wide range of designs. A common kind is a "bomb calorimeter," which essentially consists of a cage within which the reaction occurs and a liquid, such water, around it that absorbs the energy of the reaction and raises temperature as a result.
Heat absorbed= heat released
4.18 × 100 (28.0 - 24.5) = 1463 1463 ÷ 28.25 ÷ (100 - 28.0)
= 1463 ÷ 28.25 ÷ 72
=0.719 cal /g⁰ C
Therefore, 0.719 cal /g⁰ C is the specific heat of this metal.
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A witting reagent is a ___, a species containing two oppositely charged atoms bonded to each other, which both have full octets. In the Wittig reagent, a negatively charged ___ atom is bonded to a positively charged ___ atom.
A Wittig reagent is a ylide, a species that contains two oppositely charged atoms bonded to each other, and both atoms have octets. In a Wittig reagent, a negatively charged carbon atom is bonded to a positively charged phosphorus atom.
An atom is a particle that consists of a nucleus of protons and neutrons surrounded by a cloud of electrons. The atom is the primary particle of the chemical factors, and the chemical factors are outstanding from every different by using the wide variety of protons which can be in their atoms.
the primary person to discover an atom become the Greek philosopher Democritus. He defined atoms as the essential or fundamental unit. in line with his concept; All count number includes atoms, which are the bits being counted as too small to be visible. Many atoms encompass a definitely charged nucleus along with protons and neutrons surrounded via a cloud of electrons charged negatively. An atom is any particle of the count at its most fundamental stage which includes as a minimum one proton. as a result, John Dalton is known as the father of atoms and the atomic principle.
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3 Cu + 8HNO3 --> 3 Cu(NO3)2 + 2 NO + 4 H2O In the above equation how many moles of water can be made when 103.5 grams of HNO3 are consumed?
Taking into account the reaction stoichiometry, 0.82 moles of water can be made when 103.5 grams of HNO₃ are consumed.
Reaction stoichiometryIn first place, the balanced reaction is:
3 Cu + 8 HNO₃ → 3 Cu(NO₃)₂ + 2 NO + 4 H₂O
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Cu: 3 molesHNO₃: 8 molesCu(NO₃)₂: 3 molesNO: 2 molesH₂O: 4 molesThe molar mass of the compounds is:
Cu: 63.54 g/moleHNO₃: 63 g/moleCu(NO₃)₂: 187.54 g/moleNO: 30 g/moleH₂O: 18 g/moleBy reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
Cu: 3 moles ×63.54 g/mole= 190.62 gramsHNO₃: 8 moles ×63 g/mole= 504 gramsCu(NO₃)₂: 3 moles ×187.54 g/mole= 562.62 gramsNO: 2 moles ×30 g/mole= 60 gramsH₂O: 4 moles ×18 g/mole= 72 gramsMass of water formedThe following rule of three can be applied: if by reaction stoichiometry 504 grams of HNO₃ form 4 moles of H₂O, 103.5 grams of HNO₃ form how many moles of H₂O?
moles of H₂O= (103.5 grams of HNO₃×4 moles of H₂O)÷504 grams of HNO₃
moles of H₂O= 0.82 moles
Finally, 0.82 moles of H₂O are made.
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When deciding which side of a biomolecule would orient itself toward the water in cytoplasm, the___groups would be directed toward the water molecules.
Biomolecules would point their hydrophilic (water-loving) groups in the direction of the water molecules in the cytoplasm. Amino, carboxyl, phosphate, and sulfurate groups are examples of hydrophilic groups.
One of a chemical substance's smallest units, a molecule possesses all of that substance's chemical characteristics. It consists of atoms that are chemically joined together in groups of two or more. An individual molecule's chemical characteristics are determined by the kind and configuration of its atoms. H2O, C6H12O6, and oxygen are a few examples of molecules that are frequently used (O2). Small gas molecules like oxygen and nitrogen, as well as massive macromolecules like proteins and DNA, are only a few examples of the wide variety of sizes of molecules. The principles of physics and chemistry control the behaviour of molecules, including their interactions with other molecules, their capacity to absorb or release energy, and their reactivity with other substances. It's critical in domains like these to comprehend the characteristics and behaviour of molecules.
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Developers are writing code and merging it into shared repositories several times a day, where it is tested automatically. Which of the following concepts does this BEST represent?
Functional testing
Storge procedures
Elasticity
Continuous integration
Hence option Continuous integration is correct choice.
This BEST represents the concept of Continuous Integration (CI).
A Dev Ops software development method called continuous integration (CI) enables developers to integrate code changes into a single repository for automated builds and tests. The build and unit test phases of the software release process are referred to as continuous integration. Every revision that is committed starts a build and test cycle. Code updates are automatically created, tested, and readied for deployment to production via continuous delivery.
What steps are taken in a continuous code cycle?
Continuous integration, continuous delivery, continuous deployment, and continuous testing are all components of ongoing development. The technique of continually adding new code commits to your source code is known as continuous integration.
Which four stages comprise the programming cycle?
Cycle of Program Development (PDLC) a procedure that contains five stages for developing a programme. analysis, design, development, testing, implementation, and maintenance of application software.
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A series of experiments were performed to determine the density of an unknown sample. The volume (mL) was plotted in the x-axis and the mass (g) was plotted in the y-axis. The linear regression line of best fit was calculated to be and the slope has units of g/mL: y = 0.103x + -0.017 Using the line of best fit, calculate the mass of the sample, g, that would be present in 23.489 mL of the sample.
Answer:
2.39 g
Explanation:
To calculate the mass of the sample at a volume of 23.489 mL, we can use the equation of the line of best fit:
y = 0.103x + -0.017
where y is the mass in grams and x is the volume in mL.
So, for a volume of 23.489 mL:
mass = 0.103 * 23.489 + -0.017
mass = 2.39 g
Therefore, the mass of the sample in 23.489 mL would be approximately 2.39 g.
Which of the following reactants is balanced
Answer:
What are the reactants
Explanation:
2.5 pts on a piece of paper, write balanced molecular, total ionic, and net ionic equations for the reaction between aqueous solutions of sodium hydroxide and nitric acid. select the number that corresponds to the sum of the coefficient for the net ionic equation.
A chemical equation is said to be balanced when the total charge and the number of atoms for each component of the reaction are the same for both the reactants and the products.
Balanced molecular equation:
NaOH(aq) + HNO3(aq) -> NaNO3(aq) + H2O(l)
Total ionic equation:
Na+(aq) + OH-(aq) + H+(aq) + NO3-(aq) -> Na+(aq) + NO3-(aq) + H2O(l)
Net ionic equation:
OH-(aq) + H+(aq) -> H2O(l)
The sum of the coefficients for the net ionic equation is 3.
Lye and caustic soda are other names for sodium hydroxide, an inorganic substance having the formula NaOH. It is a white, solid ionic substance made up of the cations sodium (Na+) and the anions hydroxide (OH).
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Which of the following is currently most often used to indicate the location of a signal on an IR spectrum? a. Vibration excitation (increase vibration) of the bonds. b. Rotational excitation (increase rotation) of the bonds c. Breaking of the bonds d. Electricfields appearing the molecule
The most popular technique for locating a signal on an IR (Infrared) spectrum is a. bond vibration excitation (increase in vibration). The basis for IR spectroscopy is light's interaction with molecules' vibrational modes.
Spectroscopy is the study of how electromagnetic radiation interacts with matter. It is a potent analytical method utilised in many disciplines, including physics, biology, and chemistry. In spectroscopy, a sample is subjected to electromagnetic radiation, and the interaction of the radiation with the sample that results is examined to learn more about the sample's structure, composition, and chemical and physical properties. There are various types of spectroscopy, such as IR (Infrared), UV-Vis (Ultraviolet-Visible), NMR (Nuclear Magnetic Resonance), and mass spectrometry. Each of these methods can be used for various studies and gathers data about the sample using various forms of electromagnetic radiation. To analyse the vibrational modes of bonds in a substance, IR spectroscopy, for instance, emits IR light.
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a cation and an anion have approximately the same ionic radius and combine in a 1:1 ratio. given this information, these two ions will most likely crystallize in a crystal structure similar to that of .
Cation and anion will likely crystallize in a crystal structure similar to that of an ionic compound. Ionic compounds typically have a repeating pattern of positively charged cations and negatively charged anions in a crystal lattice, with each cation surrounded by anions and vice versa. When cations and anions have similar ionic radii, it is likely that they will form an ionic crystal structure.
Ionic compounds are formed by the combination of a positively charged cation and a negatively charged anion. If a cation and anion have approximately the same ionic radius and combine in a 1:1 ratio, it is likely that they will crystallize in a crystal structure similar to that of a typical ionic compound. The crystal structure of an ionic compound is defined by the arrangement of ions in a repeating pattern. When cations and anions are of similar size and combine in a 1:1 ratio, the resulting crystal structure is typically an ordered arrangement of alternating cations and anions. This arrangement results in strong ionic bonds between the cation and anion, leading to a highly stable crystal structure.
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Classify each of the following as a component of a silicate ceramic, an oxide ceramic, or a nonoxide ceramic.MgSiO4, B4C, MoSi2
In the given examples, MgSiO4 is a component of a silicate ceramic, B4C is a component of a non-oxide ceramic, and MoSi2 is a component of an oxide ceramic.
Ceramics are a class -of materials that are commonly used in a wide range of applications, including structural materials, electrical and electronic components, and biomedical devices. There are three main categories of ceramics: silicate, oxide, and non-oxide.
Silicate ceramics: Silicate ceramics are made up of silicate minerals and are characterized by their high strength and toughness, good chemical resistance, and high temperature stability. They are commonly used in applications such as high-temperature furnace linings, electrical insulators, and structural materials.
Oxidhigh-temperaturee ceramics are made up of oxides and are characterized by their high electrical and thermal conductivity, high resistance to chemical attack, and high temperature stability. They are commonly used in applications such as electrical insulators, high-temperature furnace linings, and catalysts.
Non-oxide ceramics: Non-oxide ceramics are made up of materials other than thaarmourdes and are characterized by their high hardness, high melting temperature, and high strength. They are commonly used in applications such as cutting tools, armor, and wear-resistant coatings.
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CAN SOMEONE HELP WITH THIS QUESTION?✨
Answer:
17.03 cm^3
Explanation:
V=π r ^2 h
= π · (1.02)^2 · 5.21
≈17.03 cm^3
(Radius is 1.02 b/c the question gave us diameter which is 2 times the value of radius so to get to radius we just divide diameter by 2)
Determine the mass of CO2 and the mass of H2O produced by the combustion of 1.69 g of a compound with the empirical formula CH4O
What is the mass of CO2?
What is the mass of H2O?
The mass of water created by burning 1.69 g of such a substance having the equation CH4O is 1.18 g.
How can the quantity of CO2 be determined?The total atomic masses of every atom in a molecule make up its molecular mass.
We are aware that the atomic masses of carbon (12 u) and oxygen (16 u) are different.
Thus, the molar mass of atmospheric co2 (CO2) is equal to the sum of the atomic masses of carbon and oxygen (12 + 32) to get 44 u.
How can the weight of H2O be determined?We may determine the atomic weights of the elements using their periodic tables, and we discover that hydrogen does have an atomic masses of 1, while that of oxygen is 16. One water molecule's molecular weight may be calculated by using we add the contributions from each atom; that is, 2(1) + 1(16) = 18 grams/mole.
The following is the atoms of each element equation for the combustion of CH4O:
Carbon dioxide's (CO2) molecular mass is calculated as follows: (12 + 32) = 44 u; (atomic weight of C) + 2 atomic mass of O.
2CH4O + 3O2 ----> 2 CO2 + 4 H2O
Now, molar mass of CH4O = (12 + 1*4 + 16) g/mol = 32 g/mol
Hence, 1.05 g of CH4O = 1.05g/32 g/mol = 0.0328 mol
According to balanced equation, 2 mol CH4O on combustion gives 2 mol of CO2 (2 mol * 44 g/mol = 88 g CO2) [Molar mass of CO2 = 44g/mol]
Hence, from 0.0328 mol CH4O, CO2 generated = 88 g * 0.0328 mol/2 mol = 1.44 g
Once more, based on the balanced equation,
2 mol CH4O on combustion gives 4 mol of H2O (4 mol * 18 g/mol = 72 g H2O) [Molar mass of water = 18 g/mol]
Hence, 0.0328 mol CH4O on combustion gives 72g * 0.0328 mol/2 mol = 1.18 g of H2O
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An object displaces 4 mL of water when placed in a cup. If it has a mass of 96g, what is its density?
Answer:
Below
Explanation:
Density = mass / volume the volume = the amountof water displaced
Density = 96 g /4 cc = 24 g/cc ( cc and ml are the same )
Specify whether each of the items listed is hydrophilic or hydrophobic Triglycerides Carbohydrates Oil Cholesterol Glucose lons Polar compounds Water Lipids
Triglycerides, Oil, Cholesterol, and Lipids will come under hydrophobic. Carbohydrates, Glucose, Ions, Polar compounds, and water will come under hydrophilic.
Hydrophilic and hydrophobic are terms used to portray the interaction of molecules with water.
Hydrophilic molecules are those that are attracted to water and will generally dissolve in it. These molecules have polar nature, meaning they have a lopsided distribution of electrons, which permits them to frame hydrogen bonds with water molecules.
Hydrophobic molecules are those that repulse water and don't dissolve in it. These molecules have a nonpolar nature, meaning they have an even dispersion of electrons, which doesn't permit them to shape hydrogen bonds with water molecules.
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given 8.22 grams of CH4, how many grams of H2O are required?Please look at screenshot.
According to the stoichiometry of the given balanced chemical equation, 18.02 g of water are required for 1 mole of methane and 2 moles of water.
What is stoichiometry?It is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.
In the given chemical equation 1 mole of methane gives 2 moles of water, that is, 16 g methane gives 36 g water, thus, 8.22 g will give 8.22×36/16= 18.02 g of water are required.
Thus, 18.02 g of water are required for 1 mole of methane and 2 moles of water.
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alcohols can act as either acids or bases, similar to water. in the box below draw the products of the following reaction: you should include all products. include counter-ions, e.g., na , i-, in your submission, but draw them in their own separate sketcher. separate multiple products using the sign from the drop-down menu.
either acids each having a different sketcher.Separating several items using the drop-down menu's symbol is OH - H1 - I + H2O .
What three sorts of acids are there?Acids can often be split into three main categories.The first is binary acid, followed by oxyacid and carboxylic acid.All binary acids are represented by the symbol "H-A," which stands for a hydrogen connection to a nonmetal atom.
Why does water not function as an acid or a base?In water, hydrogen ions (OH-) combine with other molecules of water to generate hydronium ions, often known as hydrogen ions or simply H3O+ ions.The equilibrium between these hydroxyl & hydronium ions prevents the solution from being either acidic or alkaline.
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under certain conditions, ammonia reacts with oxygen to give nitrogen monoxide and water. determine the balanced equation for this reaction (using the smallest set of coefficients). which of these sets contains the coefficients of ammonia, oxygen, nitrogen monoxide and water in that balanced equation (in that order)?
If ammonia reacts with oxygen to give nitrogen monoxide and water, then[tex]$4N{{H}_{3}}(g)+5{{O}_{2}}(g)\to 4NO(g)+6{{H}_{2}}O(g)$[/tex] is the balanced equation for this reaction.
What is a balanced equation?
An equation for a chemical reaction is said to be balanced if both the reactants and the products have the same number of atoms and total charge for each component of the reaction. In other words, both sides of the reaction have an equal balance of mass and charge. The equation must be balanced so that each type of atom appears in equal amounts on both the left and right sides of the arrow. This is accomplished by altering the compounds' coefficients (numbers placed in front of compound formulas). In this example, the subscripts (tiny numbers to the right of some atoms, including iron and oxygen) are never altered.
Ammonia is an unpleasant-smelling, alkaline gas. It responds to oxygen in one of two ways: — Burning when oxygen is present
Dry ammonia gas does not ignite when it is passed over in an oxygen-filled container; instead, it burns in the atmosphere, producing a greenish-yellow flame that produces nitrogen and water.
[tex]4N{{H}_{3}}(g)+5{{O}_{2}}(g)[/tex]
When an oxygen and ammonia catalyst are present.
Nitric oxide, a colorless gas, is created when ammonia gas and oxygen are passed over platinum, which serves as a catalyst. Nitric oxide can then be further oxidised to produce nitrogen dioxide, a reddish-brown gas.
Water is created
Due to the exothermic nature of the reaction, platinum emits a reddish light.
[tex]$4N{{H}_{3}}(g)+5{{O}_{2}}(g)\to 4NO(g)+6{{H}_{2}}O(g)$[/tex]
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How many F atoms are in 5.54 g of F2?
1.6×10²³ atoms of F are there in 5.54 g of F[tex]_2[/tex]. It is also the smallest piece of substance with chemical element-like characteristics.
What is atom?The smallest unit of matter that may be split without producing electrically charged particles is the atom. It is also the smallest piece of substance with chemical element-like characteristics. As a result, the atom serves as the fundamental unit of chemistry.
Space makes up the majority of an atom. The remainder is made up of a cloud of electrons with negative charges around a positive-charged nucleus made up of protons and neutrons.
moles of F[tex]_2[/tex]=5.54 / 37.9=0.14
number of atoms of F[tex]_2[/tex] = 0.14×6.022×10²³=8.4×10²²atoms
number of atoms of F=2×8.4×10²²atoms=1.6×10²³ atoms
Therefore, 1.6×10²³ atoms of F are there in 5.54 g of F[tex]_2[/tex].
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draw any molecule that has more than one functional group (at least 2 functional groups). circle and name each functional group (it is okay to use the examples in the background information):
Methanol: have two functional groups.methanol formula is CH3OH .the functional groups are Alcohol(OH),Methyl(CH3).
Methanol, the simplest aliphatic alcohol and an organic molecule having the formula CH3OH, is also known as methyl alcohol, wood spirit, among other names (a methyl group linked to a hydroxyl group, often abbreviated as MeOH). It has a pronounced alcoholic odour resembling that of ethanol and is a colourless, light, volatile liquid that is combustible (potable alcohol). Methanol is a polar solvent that was originally primarily created by the destructive distillation of wood, thus the term "wood alcohol." Nowadays, industrial methanol production mostly involves hydrogenating carbon monoxide. A methyl group is joined to a polar hydroxyl group to form methanol.A substituent or moiety of a molecule known as a functional group is responsible for the molecule's distinctive chemical reactions. No matter how the rest of the molecule is made up, the same functional group will experience the same or a similar set of chemical events.
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____has a mass number of_______, 25 protons, and 30 neutrons.
Answer: 1) Mn 2) 55
Explanation:
One of the great aspects of the periodic table is that the amount of protons corresponds to the element’s atomic number. That said, 25 protons = 25 atomic number = Manganese (or Mn).
As for mass number, just add the number of protons to neutrons. 25 + 30 = 55
In order to calculate how many kilograms of urea (NH2CONH2), would be produced from the reaction of 4kg of ammonia (NH3) and a surplus (non-limiting) amount of carbon dioxide (CO2)2NH3 (g) + CO2 ——-> NH2CONH2 + H2O (l), you would need to knowThe molar masses of ammonia and urea.
Yes, in order to calculate the number of kilograms of urea that would be produced from the reaction of 4 kilograms of ammonia and a surplus amount of carbon dioxide.
Knowing the molar masses would allow you to determine the number of moles of ammonia and urea involved in the reaction, and from there, use the balanced chemical equation to calculate the number of moles of urea produced. Once you have the number of moles of urea, you can then convert that to kilograms by multiplying by the molar mass of urea.
For example, if the molar mass of ammonia is 17 g/mol and the molar mass of urea is 60 g/mol, you would first calculate the number of moles of ammonia present, which would be 4 kg / 17 g/mol = 235.29 moles. Using the balanced chemical equation and the number of moles of ammonia, you could then determine the number of moles of urea produced and convert that to kilograms using the molar mass of urea.
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Tarek would like to germinate pumpkin seeds for his science project. He wraps the seeds in a paper towel and thinks about what to do next. What conditions should Tarek use to germinate the seeds?
The pumpkin seeds have to wrap in the towel and wet the towel slightly then place it in a warm place. The pH condition should be about neutral.
What are conditions seed germination?The seed germination of every plants need optimum sunlight and temperature. As well they must be provide with wet condition if requires. The optimum temperature for pumpkin seed germination is 15 -16 degree Celsius.
High humidity and high temperature are reported to be good condition for pumpkin seed germination. Hence, the air must not be too dry.
First wrap the seeds in a sand paper towel and soak the seeds in warm water for 2- 3 hours. 6 inch peat pot is generally used to plant the seeds. And do not place them in very deeper soil moisture.
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