Answer:
The purpose of burette reading is to tell you how much solution has been dispensed, instead of telling you how much the burette contains. Unlike other volumetric glassware, the zero scale on a burette is written on top. Measurement scale on the burette is at 0.10 intervals. All burette readings are given to an accuracy of 0.05 mL.
Make sure your eye is at the same level of the meniscus to avoid an error. For water and most liquids, the meniscus is concave or like a U shape. Read the center of the meniscus or the bottom of the U-shape.
A zoomed-in section of the burette between 20.5 milliliters and 18.5 milliliters shows the level of the solution in the burette. There is a concave meniscus at the surface of the solution. There are 3 eyes on the right side of the burette looking at the level of the solution from above, at, and below the meniscus. The eye above the meniscus reads the solution level to be at 19.42 milliliters. The eye at the same level as the meniscus reads the level of the solution to be 19.5 milliliters. The eye below the meniscus reads the level of the solution to be 19.62 milliliters. The correct measurement of the solution level is 19.5 millimeters.
Figure: How to read the meniscus. The correct reading is 19.50 mL. Due to parallax error, the reading can be 19.62 mL or 19.42 mL.
The first and final reading of the burette should be recorded. The difference between the first and final reading is called the titer.
Readings should be recorded to the nearest 0.05 mL. Examples of readings: 22.05, 23.00, and 23.05 mL.
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Explanation:
cerium has four stable naturally occurring isotopes which are listed in the table with their isotopic masses and their percent abundances. isotope mass (u) percent abundance (%) ce136 135.907 0.186 ce138 137.905 0.251 ce140 139.905 88.449 ce142 141.909 11.114 calculate the average atomic mass for cerium.
The correct answer is cerium 141,911amu.
A unit atomic mass is defined as one-twelfth of the mass of a single carbon-12 atom. The atomic mass of an element is the atomic mass. Average atomic mass is the weighted average of the atomic masses of all isotopes of that element.
To answer this question, a formula is written to calculate the average atomic mass of cerium. (135.90714 amu × 0.0019 )+ ( 137.90599 amu × 0.0025 )+ ( 139.90543 amu * 0.8843 )+(Ce−142 × 0.1113)
= 140.116
Solving the equation for Ce-142 gives an atomic weight of 141.911 amu.
The correct answer is 141,911 amu.
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if 156 ml of wet h 2 is collected over water at 24 degrees c and a barometric pressure of 737 torr, how many grams of zn have been consumed? (the vapor pressure of water is 22.38 torr.)
If 156 ml of wet h 2 is collected over water at 24 degrees c and a barometric pressure of 737 torr then about 0.391 grams of zinc. is consumed.
Utilizing the idea of gas laws, specifically Dalton's Law of Partial Pressures, which states that the total pressure of a gas mixture is equal to the sum of the barometric pressure partial pressures of the various gases in the mixture, we may solve this problem.
The wet H2 gas that is gathered over the water in this instance can be thought of as a combination of two gases: H2 gas and water vapour. The total pressure of this mixture, which was measured at 737 torr, must be converted into partial pressure of the H2 gas in order to calculate the amount of Zn that was consumed.
The partial pressure of the water vapour must first be determined using the water vapour pressure.the pressure at 24 degrees Celsius, or 22.38 torr. The following equation can be used to calculate the partial pressure of water vapour:
Water vapour pressure is determined by multiplying it by the ratio of the volume of water to the volume of gas collected.
We might presume that the volume of water collected is insignificant in comparison to the 156 ml of gas that was collected. Therefore:
Water vapour partial pressure is equal to 22.38 torr times (0.156 L / 0.156 L) to equal 22.38 torr.
The partial pressure of the H2 gas can then be determined using Dalton's Law of Partial Pressures:
Total pressure minus the partial pressure of water vapour equals partial pressure of H2 gas.
H2 gas partial pressure is equal to 737 torr minus 22.38 torr, or 714.62 torr.
now that we Assuming that the reaction between Zn and HCl that produced the H2 gas proceeded to completion, use the ideal gas law to compute the quantity of H2 gas that was produced. The reaction's chemically balanced equation is as follows:
ZnCl2 + H2 = Zn + 2HCl
What is the ideal gas law?
PV = nRT
where R is the gas constant, n is the number of moles, P is the pressure, V is the volume, and T is the temperature in Kelvin. To determine the amount of moles, we can rearrange this equation as follows:
n = PV / RT
We must change the temperature to Kelvin, the volume to litres, and the
pressure to atmospheres:
714.62 torr/760 torr/atm = 0.939 atm is the pressure.
Volume equals 0.156 L or 156 ml per one litre.
24 degrees Fahrenheit degrees Celsius plus 273.15 equals 297.15 K.
R is 0.08206 L atm/mol K, which is the gas constant. Therefore:
n is equal to (0.939 atm) x (0.161 L) / (0.08206 L atm/mol K) x (297.15 K) = 0.00599 mol.
The balanced chemical equation states that 1 mole of zinc will result in 1 mole of hydrogen gas. This means that 0.00599 mol of zinc was also used.
Using the molar mass of zinc, which is 65.38 g/mol, we can finally determine the mass of zinc that was consumed:
Zn consumption mass equals 0.00599 mol x 65.38 g/mol = 0.391 g
Therefore, the process used up about 0.391 grammes of zinc.
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Lewis dot structure for CBry
Lewis dot structure for CBr₄ can be seen in the figure.
The Lewis structure is the writing of the atomic symbol along with the valence electrons. Valence electrons are marked with dots or small crosses. Composed of one C atom and 4 Br atoms. The electron configuration of the C atom and the Br atom is as follows:
₆C= 2 4
₃₅Br = 2 8 18 7
₃₅Br = 2 8 18 7
₃₅Br = 2 8 18 7
₃₅Br = 2 8 18 7
The C atom needs 4 more electrons to reach stability while the Br atom needs one more electron to achieve stability. So that the C atom will donate one electron to each Br to be used together and each Br donates one electron to C to be used together. In writing the Lewis structure, the C atom serves as the central atom surrounded by Br atoms.
The correct question:
Lewis dot structure for CBr₄?
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which gases contribute to the greenhouse effect?nitrogen and heliumcarbon dioxide and methanecarbon dioxide and heliumnitrogen and methane
The gases that contribute to the greenhouse effect are carbon dioxide and methane.
What is greenhouse effect?The term "greenhouse effect" refers to the phenomenon that takes place when gases in the atmosphere of Earth capture heat from the sun. The result of this process is that the Earth is significantly warmer than it would be if its atmosphere did not exist. One of the factors that contributes to the fact that Earth is a suitable place to live is the greenhouse effect. Carbon dioxide, methane, nitrous oxide, hydrochlorofluorocarbons (HCFCs), hydrofluorocarbons (HFCs), and ozone in the lower atmosphere are the primary greenhouse gases whose concentrations are rising.
The natural greenhouse effect on Earth is being altered as a result of human activity. The release of more carbon dioxide into the atmosphere results from the combustion of fossil fuels such as coal and oil. The amount of carbon dioxide and other greenhouse gases in our atmosphere has been shown to be rising, according to observations made by NASA. An excessive amount of these greenhouse gases can cause the atmosphere of the Earth to trap more and more heat, which in turn causes the temperature of the Earth to rise.
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For the reaction given in Part A, ΔS∘rxn 25.0 J/K . What is the standard Gibbs free energy of the reaction, ΔG∘rxn∘? Express your answer numerically in kilojoules.
The usual change in gibbs free energy is -23.4 kJ.
Gibbs free energy, sometimes referred to as the Gibbs function, Gibbs energy, or free enthalpy, is a unit used to quantify the most work that can be performed in a thermodynamic system while maintaining constant temperature and pressure.
The formula G°=RTlnK connects G° with K. At equilibrium, products are preferred over reactants if G° 0, and K > 1. Reactants are preferred over products at equilibrium if G° > 0, K 1, and.
The system is in equilibrium if G = 0. If G>0, the procedure doesn't happen spontaneously as written; instead, it happens spontaneously the other way around.
ΔG = ΔH - TΔS
0 = ΔH - TΔS
TΔS = ΔH
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Are group 1 metals chlorides bases?
Answer: True I guess
Explanation: I’m new here but I guess it’s it’s true?
how many grams of sodium nitrate would you need to make 100 ml of a saturated solution at 25 degrees c
36.4 grams of sodium nitrate would you need to make 100 ml of a saturated solution at 25 degrees c
To make a saturated solution of sodium nitrate at 25 degrees c, you would need to measure out 36.4 grams of sodium nitrate for every 100 ml.
This is calculated using the solubility of sodium nitrate at 25 degrees c, which is 0.364 g/ml.
To make a saturated solution, multiply this value by the desired volume of solution, which in this case is 100 ml.
This gives us 36.4 grams of sodium nitrate.
ideal gas law which states that the pressure of a gas is equal to the number of moles of the gas multiplied by its temperature and the universal gas constant, divided by the volume of the container.
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the thermite reaction is performed using 8.6 g fe2o3 and 1.8 g powdered al metal. which reactant is in excess and by how much?
E. Fe2O3 ; 3.3 g is correct, Fe2O3 is the reactant and 3.3 g is excess .
The equation shows that for every 1.8 g of Al, 8.6 g of Fe2O3 is needed. Fe2O3 is an oxide of iron and is also known as ferric oxide or hematite. It is a red-brown material that is insoluble in water and is used in a variety of industrial applications.In this reaction, 1.8 g Al is used, meaning 8.6 g of Fe2O3 is needed. Since only 8.6 g of Fe2O3 is used, there is an excess of 3.3 g of Fe2O3.
Equation: 8.6 g Fe2O3 + 1.8 g Al → Al2O3 + 2Fe
Therefore 3.3g of the reactant Fe2O3 is excesss
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complete question:The thermite reaction is performed using 8.6 g Fe 2O 3 and 1.8 g powdered Al metal. Which reactant is in excess and by how much?
Fe2O3 + 2 Al → Al2O3 + 2Fe
A. Al; 0.3 g
B. Fe2O3; 2.0 g
C. Al; 2.1 g
D. Al; 1.1 g
E. Fe2O3; 3.3 g
if you had used a diprotic acid with a higher ka value, how would that have affected the volume of naoh required to reach the equivalence point (if at all)?
If you had used a diprotic acid with a higher Ka value, the volume of NaOH required to reach the equivalence point would have been higher.
This is because a higher Ka value indicates a stronger acid, and so more NaOH is needed to neutralize the acid. The amount of NaOH needed to reach the equivalence point would be directly proportional to the Ka value of the acid.
To accurately determine the endpoint, indicators such as phenolphthalein or methyl orange can be used in order to detect the change in color as the endpoint is reached. Finally, the moles of acid can be calculated from the volume of NaOH added to reach the equivalence point, as the moles of acid are equal to the moles of NaOH added.
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This diagram shows an oceanic plate plunging beneath a continental plate at a subduction zone. Subduction in this setting causes parts of the overriding continental plate to melt into magma, which rises upward through the plate.
An example of this process can be seen at the subduction zone along the western edge of South America. The Nazca plate (oceanic) plunges beneath the South American plate (continental). As in other oceanic-continental subduction zones, this process causes magma to rise and form a volcanic arc on the overriding continental plate (not on the subducting oceanic plate). Also, a trench does indeed form in a subduction zone setting. However, the trench forms on the ocean floor where the two plates meet.
Note that the phenomenon described above is called the Volcanic Arc Formation at a Subduction Zone.
What is the Subduction Zone and what is a Volcanic Arc?A volcanic arc (also called as a magmatic arc[1]: 6.2 ) is a belt of volcanoes created above a subducting oceanic tectonic plate, with the belt organized in the shape of an arc as seen from above. Volcanic arcs often run parallel to oceanic trenches, with the arc being further away from the subducting plate than the trench.
Plate tectonic boundaries where two plates converge and one plate is shoved beneath the other are known as subduction zones. Geohazards such as earthquakes and volcanoes are the outcome of this process.
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KCI (S)
Cao (s)
SiO2 (s)
Compound
Conductive
CO2 (s)
No
No
No
No
Based on the student's data, can they determine which substances are ionic, and which are covalent?
A. No, as ionic compounds are only conductive in an aqueous (water) solution.
B. Yes, as all of these compounds are ionic since they are not conductive.
C. No, as covalent compounds are only conductive in an aqueous (water) solution.
D. Yes, as all of these compounds are covalent since they are not conductive.
Yes, as all of these compounds are covalent since they are not conductive.
Based on the information provided by the students, it is not possible to determine whether the compounds are ionic or covalent by solely examining their conductivity. The students tested the conductivity of the compounds in their solid form, but the conductivity of a compound does not necessarily indicate its type of bonding. Ionic compounds can be conductive in an aqueous solution, but not in their pure solid form, while covalent compounds are typically not conductive in either form. The fact that none of the compounds are conductive in the students' experiment does not mean that they are covalent. To determine the type of bonding in a compound, other factors such as chemical formula, crystal structure, and electronegativity difference between the elements must be considered.
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after the dna duplicates, how many chromosomes are present in the nucleus?
Answer:
Once mitosis is complete, the cell has two groups of 46 chromosomes, each enclosed with their own nuclear membrane. The cell then splits in two by a process called cytokinesis, creating two clones of the original cell, each with 46 monovalent chromosomes.
what was the industrial revolution?
Answer:The Industrial Revolution transformed economies that had been based on agriculture and handicrafts into economies based on large-scale industry, mechanized manufacturing, and the factory system.
Explanation:
the student places the same mass of agoh(s) into 50.0ml of different solutions with specific ph values and measures the concentration of ag ions in each solution after equilibrium is reached. based on the data in the table, what can be concluded about the solubility of agoh?
The solubility of AgOH is dependent on pH. The solubility of a salt is determined by the balance between the rate at which the salt dissolves and the rate at which it precipitates.
By examining the concentration of Ag ions in each solution with different pH values, it can be concluded that the solubility of AgOH is dependent on the pH. If the pH is high, the concentration of Ag ions will be high, indicating a higher solubility. If the pH is low, the concentration of Ag ions will be low, indicating a lower solubility. The solubility of AgOH can be described by the common ion effect, which states that the solubility of a salt will decrease as the concentration of one of its ions increases in solution.
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4fe(s) 3o2(g) 2fe2o3(g) in a certain reaction, 27.3 g of iron reacts with 45.8 g of oxygen. what is the limiting reactant?
In a specific reaction, 27.3 g of iron and 45.8 g of oxygen combine to form 4fe(s) 3o2(g) 2fe2o3(g). Fe serves as the limiting reactant.
We can only produce 0.247 mol of ferric oxide because dioxygen is obviously in stoichiometric excess and iron is the limiting reagent. A decomposition reaction is 4Fe(s) + 3O2(g) arrow 2Fe2O3(s). 4 moles of Fe react to produce 2 moles of iron(III) oxide, according to the reaction. Iron is oxidised in this reaction when oxygen is added to it. The oxidising agent in this case is oxygen. An oxidising agent is a chemical that undergoes a redox reaction that either accepts or acquires electrons or has a tendency to add oxygen atoms.Since the ratio of carbon monoxide to ferric oxide in the balanced chemical equation is lower than it is in the provided masses, carbon monoxide is the limiting reagent.
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explain how the same chemical signal can have one effect on cell-type a, a different effect on cell-type b and no effect on cell-type c.
A chemical signal can have different effects on different types of cells due to the different receptors and signaling pathways present on each cell type.
What is chemical signal ?Chemical signals are molecules used for communication between organisms. They are emitted by one organism and are detected by another organism, which then responds in some way. Chemical signals can be used for a variety of purposes, including finding mates, repulsing competitors and predators, establishing territories, and coordinating group activities. Examples of chemical signals include hormones, pheromones, and volatile organic compounds.
Cell-type A may have a receptor for the chemical signal that is linked to a particular signaling pathway, causing it to activate a certain response. Cell-type B may have a different receptor for the same chemical signal, which is linked to a different signaling pathway, leading to a different response. Cell-type C may not have any receptor for the chemical signal, meaning that the signal cannot bind to the cell and therefore has no effect.
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A compound has a percent composition of 24.74% potassium, 34.76% manganese, and 40.50% oxygen. Assuming that the mass of the compound is 100g what is the compounds empirical formula
A compound has a percent composition of 24.74% potassium, 34.76% manganese, and 40.50% oxygen. The compound's empirical formula is KMnO₄.
What is empirical formula ?The term empirical formula is defined as a chemical compound is the simplest whole number ratio of atoms present in a compound.
Step 1:
Give:
Mass of the compound is 100 grams
24.74% = potassium
Molar mass of K = 39.10 g/mol
34.76% = manganese
Molar mass of Mn= 54.94 g/mol
40.50% = oxygen
Molar mass = 16.00 g/mol
Step 2:
Calculate moles of potassium
Moles K = mass K / molar mass K
Moles K = 24.74 grams / 39.10 g/mol
Moles K = 0.6327 moles
Step 3:
Calculate moles of Mn
Moles Mn = 34.76 grams / 54.94 g/mol
Moles Mn = 0.6327 moles
Step 4:
Calculate moles of O
Moles O = 40.50 grams / 16.00 g/mol
Moles O = 2.53
Step 5:
Calculate the mol ratio
We divide by the smallest amount of mol
K: 0.6327 / 0.6327 = 1
Mn: 0.6327/0.6327 = 1
O: 2.53 / 0.6327 = 4
Then the empirical formula is KMnO₄.
Thus, the compound's empirical formula is KMnO₄.
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a container with rigid walls holds n moles of a monatomic ideal gas. part a in terms of n , how many moles of the gas must be removed from the container to double the pressure while also doubling the rms speed of the gas atoms? express your answer in terms of n .
A container with rigid walls holds n moles of a monatomic ideal gas. part a in terms of n. The number of moles of the gas to be removed is n/3.
The pressure of a monatomic ideal gas is proportional to its number of atoms, and the root-mean-square (rms) speed of its atoms is proportional to the square root of its temperature. Doubling the pressure and rms speed of the gas atoms requires a 4-fold increase in the temperature. To increase the temperature, we need to remove a certain number of moles of gas from the container.
Since the number of atoms in the container determines the pressure, removing moles of gas from the container reduces the pressure. To double the pressure, we need to remove half of the initial number of moles, or n/2 moles, from the container.
To also double the rms speed, we need to further remove n/4 moles, so that the final number of moles is n/4.
Thus, the total number of moles to be removed is n/2 + n/4 = n/3.
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explain why one molecule of nabh4 will reduce only twomolecules of m-acetylbenzaldehyde to form thecorresponding product.
Only two molecules of m-acetylbenzaldehyde need to be reduced by one molecule of nabh4 to produce the desired result because there are only two functional groups that may react with NaBH4, namely the ketone and the aldehyde.
But NaBH4 has four Hs present to protonate the molecule. Meso substances have no optical activity. Aldehydes and ketones are the only compounds that NaBH4, a weak reducing agent, will reduce. NaBH4 can only reduce 2 molecules since it only has 4 hydride ions, and one molecule acting as the substrate will require 2 hydride ions for reduction. A stereoisomer having two or more chiral centers but no optical activity because of an internal plane of symmetry is referred to as a meso compound. Compounds known as mesomers have no net rotation of polarized light in the plane.
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Determine the empirical formula of a compound that is 68.42% Cr and 31.58% O bymass.CrOCrO15Cr4O3Cr2O3
The empirical formula of a compound that is 68.42% Cr and 31.58% O will be CrO₂.
To determine the empirical formula, we first need to convert the percentage composition to mass.
For 68.42 g Cr per 100 g of compound, we have:
68.42 g Cr / 51.996 g/mol = 1.307 mol Cr
For 31.58 g O per 100 g of compound, we have:
31.58 g O / 16.00 g/mol = 1.974 mol O
To simplify the mole ratio, we divide both mole numbers by the smaller one:
1.307 mol Cr / 1.307 mol Cr = 1.000 mol Cr
1.974 mol O / 1.307 mol O = 1.509 mol O
So the empirical formula is CrO₂, where the subscripts are the rounded mole ratio.
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--The given question is incorrect, the correct question is
"Determine the empirical formula of a compound that is 68.42% Cr and 31.58% O by mass."--
Question 3(Multiple Choice Worth 1 points)
(01.01 LC)
Which of the following is usually done last in the scientific method of investigation?
1. Ask a question
2. Test with an experiment
3. Analyze data and draw conclusions
3. Do background research and 4.construct a hypothesis
Answer:
33333333333333333333333
What separates a compound from a molecule?
A molecule refers to a basic unit of a substance that is composed of two or more atoms bonded together, while a compound refers to a substance made up of two or more different elements chemically combined in a fixed ratio.
A molecule is a basic unit of a chemical substance that consists of two or more atoms bonded together. It is the smallest particle of a substance that retains the chemical properties of the substance. A molecule can be composed of elements of the same type (such as O2, a molecule of oxygen), or elements of different types (such as H2O, a molecule of water).
A compound, on the other hand, is a substance made up of two or more different elements combined chemically in a fixed ratio. The elements in a compound are combined through chemical bonds, forming a new substance with unique properties that are different from those of the individual elements. In other words, a compound is a type of molecule that is composed of elements from two or more different types.
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calcium carbonate (caco3) is an important component of coral reefs. how many moles are in 98.6 g of caco3? type in your answer using the correct number of significant figures.
There are approximately 0.986 moles of CaCO3 in 98.6 g of the substance
Calcium carbonate (CaCO3) is an important component of coral reefs and has a molar mass of 100.09 g/mol. To find the number of moles in 98.6 g of CaCO3, we can use the formula:
number of moles = mass of substance / molar mass of substance
number of moles = 98.6 g / 100.09 g/mol
number of moles = 0.986 mol
So, there are approximately 0.986 moles of CaCO3 in 98.6 g of the substance. This answer has three significant figures, which is consistent with the number of significant figures in the mass of CaCO3 that was provided. In chemistry, it is important to always keep track of significant figures and to round the final answer to the correct number of significant figures.
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if the experiment was started with a wet flask, would the experimental value of the enthalpy of vaporization be higher, lower, or the same as the actual value? explain.
If the experiment was started with a wet flask, the experimental value of the enthalpy of vaporization would likely be lower than the actual value.
The enthalpy of vaporization, also known as the heat of vaporization, is the amount of heat energy required to change a substance from a liquid to a gas at a constant temperature. In a wet flask, some of the heat energy supplied to the substance will be absorbed by the water on the flask and will not be used to vaporize the substance. This means that it will take more heat energy to vaporize the substance than the amount recorded in the experiment, leading to a lower experimental value of the enthalpy of vaporization. Therefore, starting the experiment with a wet flask can introduce measurement errors and lower the accuracy of the experimental value of the enthalpy of vaporization. It is important to carefully control all variables and avoid any potential sources of error in experiments like this.
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what gas is produced in the reaction thus necessitating the need for loosely capped vials to allow it to escape?
The gas produced in the reaction thus necessitating the need for loosely capped vials to allow it to escape is nitrogen.
What are the main uses of nitrogen?
1. Fertilizer: Nitrogen is an essential nutrient for plants, and is often added to fertilizers to help plants grow.
2. Refrigerant: Nitrogen is used as a refrigerant in air conditioning and refrigeration systems.
3. Industrial Production: Nitrogen is used in a variety of industrial processes, such as the production of steel, rubber, plastics and other products.
4. Fuel: Nitrogen is used in the production of liquid fuels such as diesel and jet fuel.
5. Food Preservation: Nitrogen is used to preserve food by preventing the growth of bacteria and other microorganisms.
6. Medical: Nitrogen is used as a medical gas in the treatment of certain medical conditions.
When nitrogen is produced in a chemical reaction, it must be allowed to escape from the reaction vessel. If the reaction vessel is tightly capped, the pressure inside the reaction vessel will increase due to the presence of the nitrogen gas, which can cause the vessel to rupture. To prevent this from happening, the reaction vessel must be loosely capped to allow the nitrogen gas to escape.
Therefore, nitrogen is the correct answer.
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convert 70 mmhg and 120 mmhg into both si and psi pressure units. in blood pressure readings, are these absolute pressure or gauge pressure? how do they compare with atmospheric pressure (compare 1 atm to si, psi, and mmhg pressure units)?
70 mmHg will be converted to 9.333 kpa pressure SI unit and 20 mmHg will be converted to 16kpa pressure SI units.
Blood pressure is measured in mmHg because mercury is used in the manufacturing of thermometers, so it is convenient to measure the pressure by rise in height of mercury in the thermometer.
The pressure measured by the thermometer is always gauge pressure, given by:
P(gauge) = P(absolute) - P(atmospheric)
Absolute pressure for 70 mmHg is 110.658kpa whereas absolute pressure for 120 mmHg is 117.325kpa
70 mmHg and 120 mmHg can be converted into SI pressure units as:
760 mmHg=101.325kpa
70 mmHg= 70 ×101.325/760
=9.333kpa
Thus, 70 mmHg will be 9.333kpa
∴120 mmHg=120 ×101.325/760
=16kpa
Thus, 120 mmHg will be 16kpa
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if the external pressure were to decrease (for example at high elevation), how would this effect the boiling point of a pure liquid?
As atmospheric pressure decreases, water boils at decrease temperatures. At sea level, water boils at 212 °F. With every 500-ft boom in elevation, the boiling factor of water is decreased through simply beneath neath 1 °F.
At 7,500 ft, for example, water boils at approximately 198 °F. When the strain above a liquid is reduced, the vapor strain had to result in boiling is likewise reduced, and the boiling factor of the liquid decreases. The strain of gas above a liquid impacts the boiling factor. In an open gadget that is known as atmospheric strain. The extra the strain, the greater power required for drinks to boil, and the better the boiling factor. The boiling factor of a liquid will increase with boom in strain. Since a liquid vaporizes whilst molecules circulate quicker and farther aside however even as growing strain, you're making use of an outside pressure to maintain molecules in the direction of every other.
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JUST 43 PLEASE
Consider a solution contains both c5h5n and c5h5nhno3. Calculate the ratio [c5h5n]/[c5h5nhno3+] if the solution has the following pH values
The pOH expresses the hydroxide ion concentration of a solution. We can find out the value of pOH from the given values of pH.
What is pH?The pH of a solution is defined as the negative logarithm to the base 10 of the value of hydronium ion concentration in moles per litre.
pH = -log [ H₃O⁺]
pH + pOH = 14
According to Henderson Hasselbalch equation:
pOH = pKb + log [C₆H₅NH⁺] / [C₆H₅N]
a. pOH = 14 - 4.50 = 9.5
9.5 = 9.42 + log [C₆H₅NH⁺] / [C₆H₅N]
log [C₆H₅NH⁺] / [C₆H₅N] = 0.08
[C₆H₅NH⁺] / [C₆H₅N] = 1.20
[C₆H₅N] / [C₆H₅NH⁺] = 0.83
b. pOH = 8.77
-0.65 = log [C₆H₅NH⁺] / [C₆H₅N]
[C₆H₅NH⁺] / [C₆H₅N] = 0.22
[C₆H₅N] / [C₆H₅NH⁺] = 4.54
c. pOH = 9
-0.42 = log [C₆H₅NH⁺] / [C₆H₅N]
[C₆H₅NH⁺] / [C₆H₅N] = 0.38
[C₆H₅N] / [C₆H₅NH⁺] = 2.63
d. pOH = 8.5
-0.92 = log [C₆H₅NH⁺] / [C₆H₅N]
log [C₆H₅NH⁺] / [C₆H₅N] = 0.12
[C₆H₅N] / [C₆H₅NH⁺] = 8.33
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suppose that aqueous solutions of cesium hydroxide and iron nitrate are mixed. what is the name of the compound or compounds that precipitate?
When aqueous solutions of cesium hydroxide (CsOH) and iron nitrate (Fe(NO3)2) are mixed, a reaction occurs resulting in the precipitation of a compound. The chemical reaction is as follows:
CsOH + Fe(NO3)2 -> CsNO3 + Fe(OH)2
The precipitate that forms is Fe(OH)2, which is ferrous hydroxide. This compound is an insoluble salt that separates from the solution as a solid.
The solubility of Fe (OH)2 depends on the conditions of the reaction, including the concentration of the reactants, the temperature, and the pH of the solution. In general, Fe (OH)2 is not very soluble in water, so it readily forms a precipitate when it is produced in excess.
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in the atmosphere of the sun, which of these elements are least likely to be ionized? group of answer choices hydrogen and helium helium and calcium calcium and many heavier atoms unobtainium
The two elements that are least likely to be ionized in the atmosphere of the sun are hydrogen and helium.
Hydrogen and helium are the two lightest elements and have the lowest ionization energies. This means that they require the most energy to be ionized and they are very stable in the sun’s atmosphere. In contrast, calcium and many heavier atoms have higher ionization energies and are more likely to be ionized in the sun’s atmosphere. Unobtainium is a fictional element and does not exist, so it is not possible to answer this question for it.
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