The reason why a separate dropper is used for each stock solution in reagent bottle is so as to prevent contamination of the reagents.
What is a Dropper?This is referred to as a short glass or plastic tube fitted with a rubber bulb which are found in reagents and is used to measure liquids by drops in the laboratory.
It is best for a separate dropper to be used for each stock solution in reagent bottle so as to prevent contamination of the reagents. This helps to ensure that the experiments which are performed are very accurate which is therefore the reason why it was chosen as the correct choice.
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Not yet answered Points possible: 1.00 The equivalence point of any acid-base titration can be determined visually from a titration curve by finding the place where Select one: O the curve levels off. O the curve has the steepest slope. O pH=7.
The volume of the base should be gradually increased, stopping once the equivalence point is achieved. At the volume halfway between the equivalence point and the acid, the acid's pKa is equal to the pH.
What is titration, for instance?Titration, sometimes referred to as titrimetry, is a method for calculating the concentration of a specific analyte in a mixture that is used in chemical qualitative analysis. Titration, which is also sometimes referred to as volumetric analysis, is a crucial analytical chemistry method.
What governs titration in its basic form?The following is the fundamental titration principle: The sample being studied is given a solution, referred to as a titrant or standard solution. A chemical is present in the titrant in a known concentration.
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describe one chemical property of group 1 metals that results from the atoms of each metal having only one valence electron.
Alkali metals have a high electropositive polarity.This is so that each alkali metal's atom can readily create a positive ion by releasing its lone valence electron.
What are group 1's chemical characteristics? Electronegativity is a chemical characteristic of Group 1 metals that derives from each metal's atom having only one valence electron.Alkali metals are another name for Group I elements.Sodium, lithium, potassium, cesium, francium, and rubidium are some of them.In seawater, you can find them.Electronegativity is a chemical characteristic of Group 1 metals that derives from each metal's atom having only one valence electron.This refers to the atoms' propensity to attract electrons. Elements from Group 1 have similar properties.All of them are supple silver metals.These metals are highly reactive and have low melting temperatures due to their low ionization energy.As you descend the table, this family becomes more reactive.To learn more about chemical property refer to:
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Consider the product of the following mechanism. How many distinct signals (peaks) would appear in the (proton- decoupled) 13C NMR spectrum for the product? H-Br product 2. 3 3 4 5
In the (proton-decoupled) 13C NMR spectrum for the product, 5, distinct signals (peaks) would show up.
A spectrum is a state that can fluctuate without gaps across a continuum and is not constrained to a particular range of values (plural: spectrums). The term was first used in optics to refer to the rainbow of hues visible light takes on after passing through a prism. As our knowledge of light increased, it became to encompass the full electromagnetic spectrum. Thus, it evolved into a mapping of a range of magnitudes (wavelengths) to a range of attributes, including the perceived "colors of the rainbow" and other properties that correspond to wavelengths outside of the visible light spectrum.
Since then, analogies with spectrum have been used to discuss subjects unrelated to optics. Thus, one could discuss the "spectrum of political opinion".
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Fill in the Blanks Type your answers in all of the blanks and submit While we haven't really discussed this yet, there is actually a mathematical relationship that links wavelength and energy. This is a very famous equation and takes the form E = hc/ 6.63 x 10-34 and c= the speed of light = 3 x 108 m/s. where h = planks constant = Use this equation to determine the Energy of the following photons: Type your answer here 1. A photon with a wavelength of 500 nm. E = Type your answer here J 1. A photon with a wavelength of 840 nm.
A photon with a wavelength of 500 nm. E = 3.98 X 10-13 J ~ 4X 10 J,A photon with a wavelength of 840 nm lambda is 986.241
Given: Energy (E) =hc/lambda, where, h = planck's Const. = 6.63 X 10 34 J sec, C= Speed of light= 3x 108 ms, Wavelength (in m)= lambda
(i) d = 500mm = 500x109m E= 6.63 X 10-34 JS x 3x 108 ms-1 5 x 107 = 5x107 mT, E = 3.98 X 10-13 J ~ 4X 10 J. 2) lambda= 840mm = 840X109 m = 8.40x 107m 840X109 m = 8.40x 107m, E= 6·63× 10-34 JSX 3X 108 ms/8.40 X 10-7m=2.37X/0, (iii) Given: E=5-15 X 10-19 E = bcJ = 5-15x10 195 = 6·63x10-34×3×108 lambda = 3.862 × 10 = 986.241. The wavelength refers to the distance among 2 sequential waves' intersection point. The term "corresponding points" describes two pts or particulate that are within the same phase, that is, pts that have finished exactly equal fragments of one‘s periodic motion. The distance among both identical points (adjoining crests) in adjoining cycles of the a sound wave transmitter perpetuated in space or through a wire is described as the wavelength. This distance is usually specified in wireless communication systems in metres (m), centimetres (cm), or millimetres (mm) (mm). Radio signals, light waves, and infra - red (heat) waves everybody has distinctive differences that they follow as they traverse space. Each wave has its own distinctive structure and length. The particular wavelength between peaks (high points).
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From your test data, list general properties that can be associated with each type of bonding in a solid.
Answer:
it is a soild only
Selective Uptake and Gas Transport in Chemically Modified PIMs
Selective uptake is the procedure with the aid of using which membranes in cells decide what molecules can cross in and what molecules can exit of a cell.
The studies aimed to expand chemically changed PIM-1s to be used in adsorption and fueloline separation processes. In particular, the nitrile institution in PIM-1 became transformed to numerous one of a kind purposeful organizations to control the interplay capacity of PIM-1 with one of a kind species. Synthesis of PIM-1 became done with the aid of using one of a kind methods, the usage of each the low (72h, 65 °C) and the excessive temperature (forty min, 160 °C) methods.
The response led to a aggregate of hydrolysis products. The composition of the polymer has a profound impact at the very last overall performance of the polymer. Powder samples of hydrolysed PIMs had been used withinside the studies. The discount of nitrile to number one amine became done the usage of borane dimethyl sulphide complex, ensuing in amine PIM-1.
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Write out the chemical equation and equilibrium constant expression (Law of Mass Action) for the acetic acid / acetate ion buffer system. Derive the Henderson-Hasselbach equation for this system.
The chemical equation for the acetic acid / acetate ion buffer system is CH3COOH -> CH3C00- + H+.
The Henderson-Hasselbalch equation establishes a connection between an acid's pKa and pH in aqueous solutions. When the concentration of the acid and its conjugate base, or the base and the corresponding conjugate acid, are known, the pH of a buffer solution can be determined with the use of this equation. The formula is: pH = pKa + log10 ([A-]/[HA]). In this equation, [A-] stands for the molar concentration of the conjugate base (of the acid), and [HA] for the weak acid.
Given acetic acid CH3COOH the Henderson-Hasselbach equation is:
CH3COOH -> CH3COO- + H+
Ka = ([CH3COO–]x[H+])/[CH3COOH]
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place the following substances in order of increasing boiling point. ch3ch2ch3 ch3och3 ch3ch2oh ch3ch2ch3 < ch 3och 3 < ch 3ch 2oh ch 3ch 2oh < ch3ch2ch3 < ch 3och 3 ch 3ch 2oh < ch 3och 3 < ch3ch2ch3 ch 3och 3 < ch3ch2ch3 < ch 3ch 2oh ch3ch2ch3 < ch 3ch 2oh < ch 3och 3
The substances in the increasing order of boiling point are
CH3CH2CH3<CH3OCH3<CH3CHO<CH3CH2OH
What is the boiling point of a compound?
The boiling point of organic compounds can reveal vital details about their structural makeup and physical features. The boiling point of a substance aids in identifying and describing it. When the air pressure and the vapour pressure of a liquid are equal, the liquid boils. The kinetic energy of a molecule affects vapour pressure.
Despite having similar molecular weights across the board, CH3CH2OH exhibits the most intermolecular h-bonding, giving it the greatest boiling point.
Lowest boiling point for CH3CH2CH3 due to weak van der Waals forces. Furthermore, CH3CHO has a higher boiling point than CH3OCH3 because it exhibits more interactions between dipoles.
Therefore the order of increasing boiling point goes CH3CH2CH3<CH3OCH3<CH3CHO<CH3CH2OH
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help me pls
Hydrogen gas is produced when we react magnesium
metal with hydrochloric acid:
Mg(s) + 2 HCl(aq) → MgCl₂(aq) + H₂(g) T
(a) If 4.50 g of hydrogen gas is collected at STP, what
volume of hydrogen does this represent?
(b) If 0.52 mol of magnesium completely reacted, what
amount of hydrogen gas (in moles) would be produced
at STP? How many grams of hydrogen is this?
The amount of CO2 produced at STP is 4.5 g, and the amount of hydrogen biogas is 0.03969 L.
For what does STP stand?The nominal atmospheric conditions at sea level are referred to as "standard temperature and pressure" (STP). The temperature and pressure are both zero degrees Celsius (atm).
How may STP be put to use?A Layer two wireless protocol called Spanning Pine Protocol (STP) is used to stop loops from forming within a topology of a network. STP was developed in order to prevent the issues that occur when pcs transfer files on a LAN with redundant pathways.
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What is water vapor has been released into the atmosphere it rises and cools turning back into liquid What is the process called?; What is it called when water goes back into the atmosphere?; What happens when water vapor rises into the atmosphere and cools?
The process of cools turning back into liquid is called condensation. the process of water goes back into the atmosphere is called evaporation. when water vapor rises into the atmosphere and cools is forms cloud.
What is water vapor has been released into the atmosphere it rises and cools turning back into liquid What is the process called as condensation. The condensation when the water vapor converts into the liquid sate. when water goes back into the atmosphere is called as evaporation . the evaporation is the process when the liquid turns to the water vapor.
when water vapor rises into the atmosphere and cools it will forms the cloud.
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classify the substances as atomic elements, molecular elements, molecular compounds, or ionic compounds.
Noble gases, which make up the majority of atomic atoms, are the most stable chemical elements. Since they are independent, they can exist. To create compounds, they can also go through chemical reactions. On the other hand, molecular elements are chemical substances that have at least two atoms of the same chemical element in them.
Generally speaking, ionic bonding can be seen in compounds where a metal is bound to a non-metal or a semi-metal. Molecular compounds are those that are made up entirely of non-metallic elements or semi-metals and non-metallic elements.
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Mateo should pull out the parsley plants and plant carrots instead.
*
1 point
True
False
This is a food chain puzzle. Note that, based on the information given, if Mateo should pull the Parley Plants and plant carrots, he will still have Swallow Tail Caterpillar to contend with. This is because as already stated, Swallow Tail Caterpillar love to eat carrot leaves. Without it's leaves, the carrot will wither and die. Hence the correct response is FALSE.
What is a food chain?A food chain is a network of linkages in a food web that begins with producer organisms and ends with an apex predator, detritivore, or decomposer species. A food chain also demonstrates how creatures are tied to one another by the food they consume. Each trophic level is represented by a distinct level of a food chain.
Food chains are significant because they reveal the complicated interactions that exist in ecosystems. They can illustrate how each creature is dependent on another for survival. Food chains also show what happens when there is a problem and a producer or eater is lost. Entire towns can be destroyed.
In the above example, the carrots and parsley are primary producers, the swallowtail is a secondary consumer, and the Robin is both a secondary and a tertiary consumer.
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Full Question:
Mateo has a garden. He loves growing all sorts Of plants in it that he can eat. Lettuce is one of his favorite things to eat from his garden. Recently, Mateo decided to start growing parsley in his garden. A few weeks after the parsley started to grow, Mateo looked out of his window. There were more birds in his garden than he had ever seen before! He went outside to see why so many birds had flown in.
Mateo saw something else surprising: his parsley plants were covered in caterpillars! And sadly, almost all of the parsley had been eaten. Mateo wanted to figure out what was going on, so he read a book on gardening. He learned that the birds are robins, and the caterpillars are swallowtail caterpillars. Here is what he read in his book:
Robin:
Robins Eat worms, caterpillars, snails, beetles, crickets, ants spiders, and even daddy long legs. They also eat fruits and berries from bushes and trees.
Swallow Tail Caterpillar:
Swallowtail caterpillars are picky eaters. They only eat carrot leaves and parsley leaves from vegetable gardens.
If Mateo wants to get rid Of the swallowtail caterpillars in his garden, what should he do?
Mateo should pull out the parsley plants and plant carrots instead.
True or False
A gas is produced when H3PO4 is added to an aqueous solution of which of the following? a) NaOH b)Ba(OH)2 c)Ba(NO3)2 d) Na2CO3
A gas produced when H3PO4 is added to an aqueous solution of Ba(NO3)2
Phosphoric acid is a weak acid. Phosphoric acid, also known as orthophosphoric acid, is a tricrotic acid that exists as a dense liquid. It is an irritant or corrosive to the skin, eyes, and other mucous membranes of both humans and laboratory animals. Its salts, though, exhibit a significantly lower irritancy potential. Phosphoric Acid can irritate the lungs. Repeated exposure may cause bronchitis to develop with cough, phlegm, and/or shortness of breath. * Long-term exposure to the liquid may cause drying and crack of the skin.
H3PO4 can donate three protons during a dissociation reaction H3PO4 has three steps of dissociation.
First ionization step: H3PO4(Aq)⇌H+(aq)+H2PO4−(aq)
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Which of the following features of a 1H NMR spectrum give useful information about the structure of a compound? Choose all answers that apply.
----------------------------------------
The spin-spin splitting of signals
The number of the signals
The area under the signals
The signal distance above the baseline
The chemical shift of the signals
The number of the signals
The chemical shift of the signals.
The spin-spin splitting of signals.
Count how many signal sets you have.
• This will tell you how many types of hydrogen-bearing carbons you have. Hydrogens attached to symmetry-equivalent carbons will give equivalent signals) . If you have asymmetric looking signals, there is a good chance that two or more different
signal sets may be overlapping
Check the integration of each signal set.
• 3HCH3 group 2HCH2 group 1HCH or OH group.The above are true if there isn’t any accidental overlapping. Clean CH3 or CH2 signal sets will normally have reasonable shape symmetry.Effective recognition and integration of signal sets can help you know how many CH3’s and
CH2’s you have in your molecule
Check diagnostic “chemical shift” windows of the lines
• Use yes-or-no checklist regarding the presence of key functional groups.Things can get more complicated if two or more functional groups are both affecting a common
signal set.Chemical shift information can quickly tell you whether hydrogens are attached to arenas or
alkenes, and tell whether a CH2 or CH3 or CH signal set is attached to a single bond oxygens or
a carbonyl or an aromatic.
The splitting (number of lines) in each signal set
• The splitting provides information about what is connected to a given carbon
a. N lines N-1 “neighbor” H’s (when working from spectrum to structure)
b. N neighbors N+1 lines (when predicting spectrum from structure)
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measure or estimate npp , it can become the most difficult or challenging in___biomes, because___.
Measure or estimate npp , it can become the most difficult or challenging in aquatic biomes, because in aquatic ecosystems, light and nutrients limit primary production.
Light, water, temperature, and mineral nutrients are the four main abiotic factors that typically regulate the amount of NPP on land, and all of these abiotic factors are undergoing rapid change as a result of human activity, with very unknown implications for both local and global NPP. Net primary production (NPP) is restricted by the availability of land, water, solar radiation, and soils, despite the fact that humans can affect that capacity through inputs and management. Aquatic productivity is the rate at which energy is converted into organic materials by photosynthetic and chemosynthetic autotrophs. The primary limiting elements in an aquatic ecosystem are salinity, temperature, sunshine, oxygen content, nutrition availability, and oxygen content.
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When sodium bromide, NaBr, dissolves in water, which of the following is formed in aqueous solution?
A) Na+ ---- H - O
|
H
B) Na+ ---- O - H
|
H
C) Br- ----- O - H
|
H
D) all of the above
E) none of the above
Br- ——- In an aqueous solution, O-H is generated as follows: Water and sodium bromide, NaBr, when dissolved,
The correct answer is C
How do valence electrons work?The electrons in an atom's outermost energy level or shell are known as valence electrons. With six valence electrons, oxygen has two in the 2s subshell и four in the 2p subshell. The oxygen valence electron configuration can be written as 2s22p.
Are valence electrons typically 8 in number?The octet rule states that in order for most biologically significant elements to remain stable, they must have eight electrons in the outermost shell. Despite having the 3n shell, which has a maximum capacity of 18 electrons, as their valence shell, some atoms can nonetheless be viable with an octet.
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How many moles are in MgO?; How many moles are in 10g of MgO?; What is the grams of MgO?; How many moles are in 20 grams of MgO?
the correct answer is 20g of MgO contains 0.5 moles
Amount of MgO, w = 20g
Molar mass of MgO, M = (24+16)g mol-¹ = 40g mol-1
To find:
No. of moles of MgO in 20g, n = ?
We know that,
No. of moles = given mass(w) molar mass(M)
:: no. of moles in 20g of MgO, n = 20g 40gmol-1 → n = 0.5 mol
The molar mass of a complex mixture is determined by dividing its weight by the amount of that chemical, represented as the number of moles in the test, expressed in moles. The molar mass of a material is a bulk characteristic instead of a molecular one.
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if the system is at equilibrium, waht would happen if the follwoing changes are applied?/the volume of the container incrased why
Conversely, if you decrease the pressure (by increasing the volume of the container), equilibrium will shift to the favor the side with the most moles of gas, since more moles will occupy a greater volume. If both side of the equation have the same number of moles of gas, then there will be no change in the position of equilibrium.
The word equilibrium means "equilibrium" and indicates that a chemical reaction is an equilibrium between the reactants and the products participating in the reaction.
Equilibrium describes the state of a process where observable properties such as color, temperature, pressure, and concentration show no change.
Chemical equilibrium is a dynamic state in which front and back reactions occur at rates such that the macroscopic composition of the mixture remains constant. The equilibrium symbol ⇌ thus symbolizes the fact that the reaction occurs in both forward and reverse directions.
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Predict the carbenoid addition products of the following reactions: trans-hex-3-ene + CH2I2, Zn(Cu) cis-hept-2-ene + CH2I2, Zn(Cu)
The reactions that result in the carbenoid addition products. Trans-hex-3-ene with CH2I2, Zn (a) (Cu). 3-Nitro-pent-2-ene. ALKENE HYBRIDIZATION When three atoms are joined to a carbon (that is, one of the bonds is a double bond).
What is the carbenoid addition products?
A gateway functional group is the double bond in an alkene. The basis for the remainder of your study of organic chemistry is laid by alkene reactions, which generate numerous additional functional groups. The most frequent reactions of double bonds change the pi bond into a sigma bond because single bonds (sigma bonds) are more stable than pi bonds. As an illustration, catalytic hydrogenation splits the H-H sigma bond into two C-H sigma bonds (Section 7-8). Exothermic (H° = approximately -80 to -120 kJ>mol or approximately -20 to -30 kcal>mol).
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describe the process by which fats and plant oils are turned into valuable foods such as margarine
Margarine is a fat that has been manufactured by hydrogenation of vegetable oils.
What is the process in which the fats are turned into foods?Fats are the types of nutrients that we can get from our diet. Fats are essential for our body but too much intake of fats may be harmful and dangerous. Fats give energy to our body to perform different functions.
Oils and fats can be refined for daily usage by removing the unwanted compounds that affect the quality of our food and diet. There are four steps by which the fats can be refined for daily usage which are degumming, bleaching, neutralizing and deodorizing.
Generally, fats and oils are formed by the process of a condensation reaction between a single molecule of glycerol and three molecules of fatty acids, three molecules of water are also made in this reaction.
So we can conclude that fats can be extracted from three methods: rendering, mechanical pressing, and extracting with volatile solvents.
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Which answer choice number matches the rate law expression for the reaction? (I'm struggling with differential rate law equations. Question and more information is on picture)
The correct rate law of the reaction is depicted by the expression that has been shown in option 4.
What is the rate law?We know that the rate law has to do with the expression that shows how the reaction is carrying on. In this case, we can see that the reaction is occurring between ammonia and boron fluoride.
The rate law would show us the individual order of reaction in each of the reactants that are in the reaction. As such, we can see that the correct rate law shows the changes in the concentration of the species has shown in the table.
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the aluminum sample is dissolved in hcl and h2 gas is produced and collected over water. the volume of h2 gas produced is 73.8 ml. what is the volume of gas, in liters? ***do not enter units with your answer. do not use scientific notation. correct significant figures are required\.\***
The volume of gas is 62.2 L
The balance chemical equation is
2Al + 6 H+ → 2Al3+ + 3H2
n al/nH2 = 2/3
nH2 = 3/2 nAl
nAl = given mass / molar mass = 42/27 = 1.56 mol
nH2 = 3 × 1.56/2 = 2.34 mol
so, accordingly to ideal generation PV = nRT
V = nRT/P
T = 30 degree celsius = 303K
V = 62.2 L
The amount of occupied three-dimensional space is measured in volume. It is typically expressed quantitatively using SI-derived units (such the cubic meter and liter) as well as other imperial or US-standard units (such as the gallon, quart, cubic inch). By the definition of length, volume and length are connected (cubed). The volume of a container is commonly understood to be its carrying capacity, or the amount of fluid (liquid or gas) that it could hold, as opposed to how much actual space the container occupies.
In the past, standardized containers were used to calculate volume first, followed by naturally occurring vessels of a similar shape. A number of simple three-dimensional shapes have volumes that can be calculated using mathematical methods.
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the solera system is a systematical aging and blending of spanish sherry where a portion of wine from each vintage year is removed and added to an older vintage. the oldest blend is then bottled and sold.
The solera system is the systematical aging and the blending of spanish sherry where a portion of wine from vintage year is removed and added an older vintage. oldest blend is then bottled and sold. this statement is true.
The solera system can be defined as the process used for liquids that aging liquids these are like wine, beer vinegar, the brandy. it is done by the fractional blending. the process is done in such a manner that the final product is the mixture of the ages. as the process continues for many years the average age will gradually increases.
Thus, The portion of the wine from each the vintage of year is removed and added to an older vintage, the oldest blend will bottled and then sold.
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the balanced equation for part 2 of the experiment is: zn (s) cu2 (aq) cu (s) zn2 (aq) this reaction is...
This reaction shows that Cu is reduced and Zn is oxidized and the reaction takes place spontaneously.
Those species are reduced readily which has high value of reduction potential. Here, Cu2+ has a reduction.
If the typical electrode potential for a redox reaction, Eo (redox reaction), is positive, the reaction is considered spontaneous. Redox reaction Eo (which is positive) will cause the reaction to move forward (spontaneous). (See voltaic and galvanic cells.)
A spontaneous reaction is one that favors the creation of products under the reaction's current conditions.
Free energy is released during spontaneous reactions, so the sign of G must be negative. There are four different possible combinations because both H and S can be positive or negative depending on the specific reaction's characteristics.
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Is nitric acid a strong or weak acid?; How is nitric acid classified?; Why is nitric acid classified as a strong acid?; Is nitric acid considered strong?
Nitric acid is a strong acid because it completely ionizes into hydronium (H₃O⁺) and nitrate (NO₃⁻) ions in aq. solutions.
The chemical formula for nitric acid is HNO₃, and it is an inorganic substance. It is a mineral acid that is extremely corrosive. The substance lacks any apparent color, however, older samples often have a yellowish tinge to them because of the degradation into oxides of nitrogen. The nitric acid that is available for purchase on the market has a volume of 68% in H₂O. Fumigating nitric acid is the name given to the solution if it reaches a concentration of greater than 86% HNO₃. Fumigating nitric acid can be further classified as either red-fuming nitric acid at concentrations greater than 86% or white-fuming nitric acid at concentrations greater than 95%. This distinction is made based on the amount of nitrogen dioxide that is present.
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calculate the theoretical oxygen demand (in mg/l) of a solution containing 450 mg of glucose (c6h12o6) in 2 liters of distilled water. (hint: write and balance the oxidation reaction of glucose) (4 pts)
The theoretical oxygen demand THOD=239.792 mg/L is given for the solution of 450 mg of glucose.
Theoretical Oxigen demand (THOD):
is the theoretical quantity of oxygen
required to oxidize the natural fraction of a
waste as much as carbon dioxide and water.
→ Csln = 450 mg C6H12O6 / 2 L H2O =225 mg/L sln.. mm C6H12O6 = 180.156 g/molbalanced reaction:C6H12O6+ 602 6CO2 + 6H2O mol C6H12O6 = 1 mol→ mass C6H12O6 (180.156 g/mol)(1 mol) = =180.156 gThe fee of ThOD is decided when180.156 g C6H12O6 devour mass O2 =.mm C6H1206 = 180.156 g/molbalanced reaction:C6H12O6+6O2 6CO2+6H2O mol C6H12O6 = 1molRightarrow massC6H12O6 = (180.156g / m * ol)(1mol) = 180.156 ghe fee of ThOD is decided when180.156 g C6H12O6 devour mass 02 =6(32) = 192 g Oxygen; then in an answer of225mg / L you have: → ThOD = (192/180.156)x 225mg / LThOD = 239.792mg / L.Read more about oxygen:
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of the three types of subatomic particles, only neutrons do not carry charge. protons carry a positive charge, and electrons carry a negative charge. protons and neutrons are bound in the nucleus, while electrons orbit the nucleus. when the number of each type of subatomic particle in an atom changes, the characteristics defining the atom also change. match the appropriate phrases with the type of subatomic particle that completes the defining characteristic.
To complete the definition joining and ordering the given phrases, the atom, protons, neutrons and electrons have been considered as a sequence.
Ordered definitions of atomic particlesIn the atom, the defining characteristics change when the amounts of groups of subatomic particles vary, that is, when the number of neurons, protons, or electrons changes.
The numbers of protons and neutrons vary equally because they are bound together in the nucleus.
The number of electrons is different from that of protons and neutrons, and these are orbiting around the nucleus.
Protons carry a positive charge
Electrons have a negative charge.
Neutrons have a neutral charge, that is, they have no charge.
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Using the balanced equation below,
how many grams of cesium fluoride
would be required to make 73.1 g of
cesium xenon heptafluoride?
CSF + XeF6 CsXeF7
To solve this problem, we can use the coefficients in the balanced chemical equation to determine the ratio of the amounts of each reactant and product. This will allow us to determine the amount of cesium fluoride needed to produce a given amount of cesium xenon heptafluoride.
In the given equation, we can see that for every 1 molecule of cesium fluoride, we get 1 molecule of cesium xenon heptafluoride. This means that the ratio of cesium fluoride to cesium xenon heptafluoride is 1:1.
We are given that we want to make 73.1 g of cesium xenon heptafluoride. Since the ratio of cesium fluoride to cesium xenon heptafluoride is 1:1, we can use the mass of cesium xenon heptafluoride to determine the mass of cesium fluoride needed. Specifically, we can set up the following equation:
CsF mass = CsXeF7 mass
Substituting the given values into this equation, we get:
CsF mass = 73.1 g
Solving this equation gives us a mass of 73.1 g of cesium fluoride.
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CH3OH(g) —> CO(g) + 2 H2(g) DH° = +91 kJ/molrxnThe reaction represented above goes essentially to completion. The reaction takes place in a rigid, insulated vesselthat is initially at 600 K.Which of the following statements about the bonds in the reactants and products is most accurate?(A) The sum of the bond enthalpies of the bonds in the reactant is greater than the sum of the bond enthalpies of the bonds in the products.(B) The sum of the bond enthalpies of the bonds in the reactant is less than the sum of the bond enthalpies of the bonds in the products.(C) The length of the bond between carbon and oxygen in CH3OH is shorter than the length of the bond between carbon and oxygenin CO.(D) All of the bonds in the reactant and products are polar.
CH3OH(g) —> CO(g) + 2 H2(g) The reaction takes place in a rigid, insulated vessel that is initially at 600 K. (B) The sum of the bond enthalpies of the bonds in the reactant is less than the sum of the bond enthalpies of the bonds in the products.
The term "bond enthalpies," which is also referred to as "bond energy," describes the strength and subsequently the stability of a chemical connection. The bond enthalpy of a chemical bond is the total energy required to dissolve 1 mole of that chemical bond. The single bond between oxygen and hydrogen, for instance, has a bond enthalpy of 463 kJ/mol. This means that a total energy of 463 kilojoules must be used to break a mole of hydrogen-oxygen single bonds. The fact that a chemical bond breaking process is always endothermic must constantly be kept in mind (because energy must be supplied to the molecule in order to break the chemical bonds that constitute it). As a result, whenever a chemical bond breaks, there is a positive enthalpy shift (H > 0). The creation of a chemical bond, on the other hand, is virtually invariably an endothermic process. There will be a negative enthalpy shift under these circumstances. The "mean bond enthalpy" or "average bond enthalpy" refers to the strength of a single bond within a molecule.
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which of the following are potential safety concerns for this lab? two of the answer choices below are correct...select the two correct answers. (grading note: for this type of question, canvas will award points for correct selections and deduct points for incorrect selections. make sure you are focusing on the safety concerns for this specific experiment.) group of answer choices broken glassware caustic bases (such as naoh) organic solvents (such as acetone or toluene) open flames
Since the flame test in this experiment requires the use of heat. Consequently, two potential risks include glassware shattering during the flame test and open flames. The correct answers are a and e.
What is a flame test?A qualitative test called the flame test is employed in chemistry to help identify or rule out the identity of a metal or metalloid ion present in an ionic compound. A distinctive color that can be seen with the eye may be released if the compound is placed in the flame of a gas burner.
Why do we do flame tests?The flame test is used to visually identify a metal or metalloid ion that is unknown.
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