Answer:
45 mins
Explanation:
it takes 45 minutes long
Which effect of the chemical industry is a positive one? (1 point)
O acid rain
O advancements in medicine
O building manufacturing
O pollution of water
In an ecosystem, the effect of the chemical industry which is a positive one is advancements in medicine.
What is an ecosystem?Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
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Energy Changes and chemical Reaction
The volume of oxygen is 14.7 litres.
What is volume?
volume is a measure of occupied three dimensional space.
Sol-Balanced chemical reaction: C₃H₈ + 5O₂ → 3CO₂ + 4H₂O.
m(C₃H₈-propane) = 5.53 g.
n(C₃H₈) = m(C₃H₈) ÷ M(C₃H₈).
n(C₃H₈) = 5.53 g ÷ 44.1 g/mol.
n(C₃H₈) = 0.125 mol.
From chemical reaction: n(C₃H₈) : n(O₂) = 1 : 5.
n(O₂) = 0.625 mol.
T = 25° = 298.15K.
p = 1.04 atm.
R = 0.08206 L·atm/mol·K.
Ideal gas law: p·V = n·R·T .
V(O₂) = n·R·T / p.
V(O₂) = 0.625 mol · 0.08206 L·atm/mol·K · 298.15 K / 1.04 atm.
V(O₂) = 14.7 L.
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what volume (in ml) of a 2.0 m solution of naoh is needed to prepare 494.4 ml of a 0.15 m solution of naoh
The volume of a 2.0 m solution of NaOH needed to prepare 494.4 ml of a 0.15 m solution of NaOH is 37.08 ml.
Dilution is defined as the process in which the concentration of a sample is decreased by adding more solvent. The dilution formula is given below.
C₁V₁ = C₂V₂
where C₁ = initial concentration of sample = 2.0 m
V₁ = initial volume of sample
C₂ = final concentration after dilution = 0.15 m
V₂ = total final volume after dilution = 494.4 ml
Plug in the values to the formula and solve for the volume of the solution needed.
V₁ = C₂V₂/C₁
V₁ = (0.15 m)(494.4 ml)/(2.0 m)
V₁ = 37.08 ml
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if 243 mg of mg(oh) 2 was neutralized with 0.0500 m hcl, what volume of hcl would you need for the neutralization?
volume of HCl would you need for the neutralization is 4 ml .
What is neutralization reaction ?
In chemistry, neutralization or neutralization (see spelling difference) is a chemical reaction in which acids and bases react quantitatively with each other. When reacting in water, neutralization does not generate excess hydrogen or hydroxide ions in solution. The pH of the neutralized solution depends on the acidity of the reactants.
In the context of chemical reactions, the term neutralization is used for reactions between acids and bases or alkalis. Historically, this reaction was expressed as
Example:
HCl + NaOH → NaCl + H2O
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The percent ionic character of a bond ______ with δen. An arbitrary value of ______ divides ionic from covalent bonding.
The percent ionic character of a bond increases with δen. An arbitrary value of 50% ionic character divides ionic from covalent bonding.
What is covalent bond explain?When two or more atoms share one or more couples of electrons, a covalent connection is created. These electrons are being drawn to the two neutrons and protons at the same time. A covalent bond is created when the difference between the two atoms' electrical configurations gets too small for an electrochemical reaction to happen and produce ions.
What characteristics do covalent bonds have?Bonds between atoms in covalent compounds share electrons. They possess distinctive physical characteristics, such as lower melting temperatures and electrical conductivity contrasted to ionic compounds, as a result of the sharing of electrons.
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why is longitudinal diffusion a more serious problem in gas chromatography than in liquid chromatography?
The longitudinal diffusion a more serious problem in gas chromatography than in liquid chromatography because the diffusion coefficient is much more larger in gas than the liquid.
What is Chromatography?Chromatography is a type of laboratory technique which is performed for the separation of the mixture of different elements into its components. The mixture firstly dissolved in a fluid solvent which is known as the mobile phase, that carries it through a system at which the material called the stationary phase is fixed.
Not all molecules present in the same solute show same behavior. Different molecules show different behaviour. This is due to mainly three reason which arr given as below:
Resistance to the transfer of matter. Longitudinal diffusionSwirl diffusionThe molecules of solute moves in different direction in the stationary phase, it is due to porosity of the particle that form it.
Thus, we concluded that the longitudinal diffusion a more serious problem in gas chromatography than in liquid chromatography because the diffusion coefficient is much more larger in gas than the liquid.
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The intermolecular force in which a hydrogen atom that is bonded to a highly electronegative atom is attracted to an unshared pair of electrons of an electronegative atom in a nearby molecule is known as _________ ________.
The intermolecular force in which a hydrogen atom that is bonded to a highly electronegative atom is attracted to an unshared pair of electrons of an electronegative atom in a nearby molecule is known as Hydrogen Bond.
An intermolecular force (IMF) known as a hydrogen bond is created when an electronegative atom with a single pair of electrons and a hydrogen atom connected to a strongly electronegative atom is in close proximity to one another. Between molecules, there are intermolecular forces (IMFs). Dispersion forces and regular dipole-dipole interactions are more examples. In general, hydrogen bonds are weaker than true covalent and ionic bonds but stronger than common dipole-dipole and dispersion forces.
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How many particles are in 0.75 moles of AgNO3?
Explanation:
Assume if its asking about molecule particle:
1 mol of AgNO3 = 6.022 x 10^23 molecules
0.75 mol of AgNO3 = 0.75 x 6.022 x 10^23
= 4.5165 x 10^23 molecules
Assume if its asking about atom particle:
AgNO3 has 5 elements
0.75 mol of AgNO3 = 0.75( 5 x 6.022 x 10^23)
= 2.2583 x 10^24 atoms
acetylene () is used in welding torches, because it produces an extremely hot flame when it burns. how many grams of carbon dioxide are formed in the combustion of 6.50 g of acetylene?
Acetylene (C₂H₂) is used in welding torches, because it produces an extremely hot flame when it burns. grams of carbon dioxide are formed in the combustion of 6.50 g of acetylene is 22 g.
the balanced reaction is given as :
2C₂H₂ + 5O₂ -----> 4CO₂ + 2H₂O
mass of C₂H₂ = 6.50 g
molar mass of C₂H₂ = 26 g/mol
number of moles of C₂H₂ = mass / molar mass
= 6.50 / 26
= 0.25 mol
2 moles of C₂H₂ produced 4 moles of CO₂
0.25 mol of C₂H₂ produced = (4 / 2) × 0.25 = 0.5 mol of CO₂ .
mass of CO₂ = molar mass × moles
= 44 × 0.5
= 22 g
Thus, Acetylene (C₂H₂) is used in welding torches, because it produces an extremely hot flame when it burns. grams of carbon dioxide are formed in the combustion of 6.50 g of acetylene is 22 g.
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what if you measurd out more Fe then you calculated but the same amount of CUSO4 How would your amount of CU produced be affected
Answer:
Increase
Explanation:
Fe + CuSO4 - - > Fe2(SO)3 + Cu
If concentration of Fe increases, it will increase the frequency of collisions between the two reactants. Therefore the amount of Cu will also increase.
if 5.01 moles of ti are mixed with 7.86 moles of cl2 and 2.47 moles of ticl4 are formed, what is the percent yield of this reaction? answer in percent to 3 significant figures.
Titanium is also utilized in the construction of portable computer housings and medical implants. Despite being the ninth most prevalent element in the crust of the Earth, titanium is relatively challenging to extract from its ores. Titanium-containing oxide minerals react with solid carbon and chlorine gas to produce titanium tetrachloride and carbrabon dioxide in the first step of the extraction process.
therefore,
5.01+7.86=12.87
12.87/2.47=19.1%
Yeild Percentage is 19.1%
Minerals are naturally occurring inorganic elements or compounds with an organized internal structure, a distinctive chemical composition, crystal shape, and physical characteristics. The yield percentage is 19.1%. Quartz, feldspar, mica, amphibole, olivine, titanium, and calcite are examples of common minerals.
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what is the ph of a solution obtained by dissolving two extra-strength aspirin tablets, containing 450 mg of acetylsalicylic acid each, in 300 ml of water?
The ph of a solution obtained by dissolving two extra-strength aspirin tablets is 8.
The Concentration of solution is a measure of the quantity of solute that has been dissolved in a given amount of solvent or answer. A concentrated answer is one that has a rather huge quantity of dissolved solute.
Calculation:-
volume = 300 ml = 0.3 L
mass = 450 mg
molar mass C₉H₈O₄ = 180
mole = mass / molar mass
= 450/180
= 2.5 mol
Concentration = mole/volume
= 2.5 /0.3
= 8.33
PH = - llog[H+]
= 8.
The concentration of a substance is the quantity of solute found in a given amount of solution. Concentrations are normally expressed in terms of molarity, defined because of the variety of moles of solute in 1 L of answer.
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given the table below that shows student's examples of proposed models of the atom: which model correctly describes the locations of protons and electrons in the wave-mechanical model of the atom?
The model accurately depicts where protons and electrons are in the wave. The proton is in the nucleus and the electron is where it is most likely to be. This is the mechanical model of the atom.
The electron was expected to move in circular orbits according to the Bohr model. On the other hand, orbitals are used in the wave mechanical model to characterise the electron positions. The two are not the same. Protons are located inside the nucleus in the wave mechanical model of an atom, but electrons are present where they are most likely to be.
A subatomic particle with a negative charge is an electron. A subatomic particle having a positive charge is called a proton. The strong nuclear force holds protons together in the nucleus of an atom. A type of subatomic particle without charge is the neutron (they are neutral).
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write a brief procedure outlining how would you prepare 250ml of a 0.150m solution of cocl2 from solid cocl2 and distilled water
4.87g of would be prepared 250mL of 0.150M solutions of COCl2 form solid COCl2 and distilled water.
Solution and solvent:
A solution is a homogeneous mixture of one or more solutes dissolved in a solvent. Note that the solvent is the substance that is present in the greatest amount. Many different kinds of solutions exist. For example, a solute can be a gas, a liquid, or a solid.
Let us consider that the solution is dissolved in the solvent.
Here the solution is cobalt(II) chloride and the solvent is distilled water.
The volume of solute is generally ignored, so we would dissolve
250ml . L / 10³ml. 0.150 M . 129.9g/ mol ≈ 4.87g
Therefore 4.87g of cobalt(II) chloride was in approximately 250mL distilled water to create the solution.
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Please help with the question!
Subtract the initial mass from final mass, i.e., vm.
why do primary alkyl halides typically undergo sn2 substitution reactions more rapidly than do secondary or tertiary alkyl halides
The SN2 reaction proceeds most quickly for primary carbons and there's less steric congestion for all of this backside assault.
Secondary as well as tertiary alkyl halides undergo the SN2 reaction more slowly than primary alkyl halides. Since there were only three little hydrogen atoms present, methyl halides interact in SN2 reactions the fastest among the simple alkyl halides.
Due to the fact that tertiary carbocations comprise three alkyl groups and secondary carbocations only have two, the former is more stable. Based on the inductive effect, tertiary carbocation is therefore more stable that secondary carbocation.
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b) if 3.25 moles of al and 1.92 moles of fe2o3 react together, what is the maximum amount of energy (dh) produced in this reaction?
The maximum amount of energy produced in this reaction is -1381.58J
What is mole?
It is defined as amount of a substance that contains exactly 6.02 × 10²³ ‘elementary entities’ of the given substance.
b) mole ratio = moles / balanced coefficient
mole ratio of Al = 3.25 mol/2 mol= 1.62
mole ratio of Fe2O3 = 1.92 mol/1 mole = 1.92
here , Al is the limiting reactant because of lower nole ratio, therefore it produces maximum amount of heat
Since 2 mole Al produces ∆H° rxn = -850.2J
1 mole Al produces ∆H° rxn = -850.2J/ 2
3.25 mole Al produce ∆H° rxn = (-850.2J/ 2) × 3.25
= -1381.58J
Hence energy ∆H = -1381.58J
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Explain why onions make you cry
if 2.50g of the organic fuel was reacted with 2.50g of oxygen and 1.00g of water was actually produced, what is the percent yield of this reaction?
The percent yield would be 40% if 2.50g of the organic fuel was reacted with 2.50g of oxygen and 1.00g of water was produced.
How is the percent yield of an organic molecule determined?
The percentage yield is a figure generated to represent the discrepancy between an experiment's theoretical and actual yields. There are by-products and desired products while experimenting with various solutions or producing chemical solutions.To calculate the yield percentage: Multiply by 100 after dividing the actual yield obtained in the lab by the estimated theoretical yield.For instance, your percent yield would be as follows if you started with 100 grams of compound A and produced 80 grams of product B: 80% yield is equal to (80 grams B / 100 grams A) × 100.To learn more about percent yield, follow the link https://brainly.com/question/12704041
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explain why there is a difference in percent of mass change of the eggs in the different sucrose solutions.
There is a difference in the rate of mass change because eggs gain mass when kept in hypotonic solution, whereas they lose mass when kept in hypertonic solution.
What is hypertonic and hypotonic solution?Hypertonic solutions contain high concentrations of solutes compared to other solutions. The opposite solution with a lower concentration is called a hypotonic solution. Cells are considered hypotonic when placed in a hypertonic solution.
Hypotonic solution refers to a solution that contains a lesser amount of solute than the solute concentration of another solution through a semipermeable membrane.
Thus, eggs placed in high concentrations of sucrose lost the most weight. So the higher the sucrose concentration, the more water the egg will lose.
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suppose that 60 ml of 0.1 m naoh is required to completely neutralize the amine group of glycine in an analyte solution. what quantity of glycine is present in the analyte?
The quantity of glycine present in analyte as measured by titration is 3mmol.
This titration calculation can be done using dimensional analysis. All values should first be converted to scientific notation: 60 mL NaOH is equal to 6 x 10-2 L NaOH. 1 x 10-1 mol NaOH/L NaOH is equal to 0.1 M NaOH. For every mole of glycine present in the analyte, 2 moles of NaOH have been supplied at the second equivalence point. This is due to the fact that one OH- was necessary to scavenge the COOH group, and a second OH- was required to scavenge the amine. To take this into consideration, we must adjust our computation. Finally: (6 x 10-2 L NaOH) x (10-1 mol NaOH / L NaOH) x (1 mol glycine / 2 mol NaOH) = 3 x 10-3 mol = 3.0 mmol glycine.
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Can yall help me with this
The phrase "axial tilt" is essential to understanding why the season change , the words or phrases from the article provided context clues to the meaning of the phrase " axial tilt" is orbits and 23.5 degree offset.
The axial tilt also called as obliquity. The axial tilt is the angle between the objects rotational axis and its orbital axis , perpendicular to the orbital plane. The axial tilt is about 23.5 degree. due to this the sun shines on different latitudes with different angle.
Thus, The phrase "axial tilt" is essential to understanding why the season change , the words or phrases from the article provided context clues to the meaning of the phrase " axial tilt" is orbits and 23.5 degree offset.
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Answer:
A: 2 and 4
Explanation:
ttt
* i need to make a 2.00 m solution of sodium hydroxide. i have a 11.9 m solution of naoh on the shelf. how many ml of the 11.9 m solution of naoh do i need to make 2 liters of the 2.00 m naoh solution?
336 ml of the 11.9 m solution of NaOH do i need to make 2 liters of the 2.00 m NaOH solution
What is Chemical reaction ?
Chemical reactions happen absolutely everywhere. While we sometimes associate chemical reactions with the sterile environment of test tubes and laboratories, nothing is farther from the truth. In fact, a vast number of transformations are creating a dizzying and almost incomprehensible series of new matter and energy changes in our world every second of every day. In nature, chemical reactions can be much more difficult to control and in some cases much more complex than in the laboratory, and generally occur whether you want it or not!In the woods A raging fire, the slow rusting process of iron over the years in the presence of oxygen and water, or the delicate ripening of fruit on a tree, the transformation of various chemicals, etc... (reactants ) into another group of substances (products) is a so-called chemical reaction.
use M1V1=M2V2
V1 = M2V2/M1 = 336 ml .
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a 5.00 g sample of a compound containing only chlorine and oxygen contains 1.94 g of chlorine. what is the empirical formula of this compound?
The empirical formula of this compound is ClO₇.
If a 5.00 g sample of a compound containing only chlorine and oxygen contains 1.94 g of chlorine, then the mass of its oxygen is the difference between the mass of the sample and the mass of its chlorine.
mass compound = mass oxygen + mass chlorine
mass oxygen = mass compound - mass chlorine
mass oxygen = 5.00 g - 1.94 g
mass oxygen = 3.06 g
Determine the number of moles of each component by dividing the mass by its respective molar mass.
moles oxygen = mass oxygen / MM
moles oxygen = 3.06 g / 15.9994 g/mol
moles oxygen = 0.1912571721
moles chlorine = mass chlorine/ MM
moles chlorine = 1.94 g / 70.9060 g/mol
moles chlorine = 0.02736016698
Get the ratio between the two components to determine its empirical formula.
moles oxygen : moles chlorine = 0.1912571721 : 0.02736016698
moles oxygen : moles chlorine = 7 : 1
Hence, he empirical formula of this compound is ClO₇.
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concentrated nitric acid usually has a density of 1.4 g/ml and is 70% hno3 by mass (the rest is water). find the concentration of water in such a solution in mol/l.
The concentration of water in such a solution in mol/l is 0.0157 M.
Molar concentration is a measure of the concentration of a chemical species, particularly of a solute in an answer, in phrases of quantity of a substance per unit quantity of solution. In chemistry, the most commonly used unit for molarity is the range of moles consistent with liter, having the unit symbol mol/L or mol/dm³ in the SI unit.
Molarity (M) is the quantity of a substance in a certain volume of solution. Molarity is described as the moles of a solute consistent with liters of an answer. Molarity is likewise called the molar attention of a solution.
Calculation:-
The density of the solution is 1.41 g/mL.
1000 g of the solution will have a volume = Mass/ Density
= 1000 / 1.41
=709 ml.
The mass percent of nitric acid is 70%.
1000 g of the solution will have = 1000× 70/100
=690 g of nitric acid.
The molarity of the solution is = Mass of nitric acid / The molar mass of nitric acid ×Volume of solution.
Mass of nitric acid = 700 / 63×709
= 0.0157 M.
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an oxygen-containing compound shows strong, broad ir absorption at 3200 - 3500 cm-1. what is the functional group present?
An oxygen containing compound shows strong, broad ir absorption at 3200 - 3500 cm⁻¹ the functional group present is carboxylic acid
A carboxylic acid is the functional group combine the feature of alcohol and ketones because it has both the OH bond and C=O bond and therefore carboxylic acid show a very strong and broad band covering a wide range between 2800 to 3500 cm⁻¹ for the OH strech and the range 2850 to 3000cm⁻¹ belong to saturated system while peak 3000 to 3100 indicate an unsaturated system and ir absorption is caused by the interaction between the IR electric field vector and the molecular dipole transition moments related to the molecular vibration
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a system is compressed from 50 l to 5 l at a constant pressure of 10 atm. what is the amouint of work done?
When a system is compressed from 50 liters to 5 liters at a constant pressure of 10 atmospheres, how much work is done must be determined. Therefore, worked on is equal to p delta v less. P stands for pressure and refers to atmosphere. Therefore, we must convert it to newtons per square meter.
The equivalent of 10 atmosphere is 10 times 10 1, 3, and 5. The final volume and its beginning volume are the Newton perimeter square and changing volume. The total number of letters is five.
Additionally, we must afterwards convert into meter cube. Now, one letter equals ten to the power three minus m cube. In order to get 15 times 10 to the power of 3 meter cube, we increase it by 10 to the monastery's -50 L.
What is Constant pressure ?volume-temperature (constant pressure) When pressure is constant, a gas's volume and temperature are directly inversely related. When pressure is constant, the volume to temperature ratio remains constant. The term "Charles' law" or "Gay-law" Lussac's refers to this relationship.
When we say that the gases are under constant pressure, we mean that the pressures do not change depending on where we are in the cylinder. Both gases fill the entire space and, as you mentioned, exert different pressures. The partial pressure of a gas is the pressure it exerts within a mixture.
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how many moles of potassium hydroxide would have to be added to 125 ml of a 0.420 m hydrocyanic acid solution, in order to prepare a buffer with a ph of 9.230?
0.021 moles of KCN are required, to prepare a buffer with a pH of 9.230
What is a buffer solution?A buffer, an aqueous solution consists of a mixture of a weak acid and its conjugate base or vice versa. Addition of a small amount of strong acid or strong base hardly changes the pH.
Given,
Volume = 125 mL
Concentration of HCN = 0.420 M
pH = 9.230
Moles of HCN = Volume × Concentration
= 0.125 × 0.420
= 0.0525 moles
HCN + KOH ⇄ KCN + H₂O
0.0525 + X ⇄ 0 [initially]
(0.0525 - X) + 0 ⇄ X [At equilibrium]
pH = pKₐ + log [salt]/[acid]
9.230 = 9.31 + log [salt]/[acid]
-0.08 = log [salt]/[acid]
0.83 = [salt]/[acid]
X / (0.0525 - X) = 0.83
X = 0.021 moles of KCN
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he quantum mechanical description of the shaped volumes of space occupied by electrons in an atom are called
Shaped volumes around the nucleus which are occupied by electrons are called Atomic Orbitals.
The quantum mechanical refinement of Bohr's orbit is an orbital. In contrast to his idea of a straightforward circular orbit with a constant radius, orbitals are regions of space that were calculated analytically and have varying possibilities of hosting an electron. A Quantum Mechanical Description of Electrons Around the Nucleus
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20 PTS!!
An experiment that tests only one factor at a time by using a comparison of a control group and an experimental group is... A) a dependent variable B) an independent variable C) a controlled experiment D) a theory