While BrI5 is not a common molecule and potentially not real, based on similar molecular structures, it would most likely be a polar molecule with polar bonds due to its presumed asymmetry and the difference in electronegativity between bromine and iodine.
Explanation:The molecule in question, BrI5 (bromine pentaiodide), does not appear to exist or is not common in chemical literature. However, assuming it follows similar principles of molecular polarity, we can deduce its polarity based on the provided information. A molecule is polar if it has polar bonds and is not symmetric, meaning that the polarities do not cancel out. Conversely, a molecule is nonpolar if it has polar bonds but is symmetric, such that the polarization cancels out, or if there are no polar bonds present.
Since BrI5 is hypothetically a molecule consisting of a central atom of bromine with five iodine atoms surrounding it, its structure would likely be asymmetric due to the odd number of atoms, leading to an uneven distribution of charge. Thus, if BrI5 did exist, it would most likely have polar bonds (as bromine and iodine have different electronegativities) and would not be symmetric; hence, it would be a polar molecule with polar bonds.
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which part of the blood is correctly paired with its function
Determine the kinds of intermolecular forces that are present in each element or compound. o2 nbr3 ch4 hf
O2 experiences London dispersion forces, NBr3 experiences dipole-dipole interaction, CH4 experiences London dispersion forces, and HF experiences hydrogen bonding due to the presence of a hydrogen atom bonded to a highly electronegative atom.
Explanation:The given molecules show different types of intermolecular forces. Oxygen gas (O2) is a non-polar molecule and it interacts through London dispersion forces, the weakest form of forces. Nitrogen tribromide (NBr3) has polar bonds, so this compound's main intermolecular force would be dipole-dipole interaction. Methane (CH4) is non-polar, so the intermolecular forces are due to London dispersion forces. Hydrogen Fluoride (HF) experiences hydrogen bonding because it contains a hydrogen atom bonded to a more electronegative atom, fluorine.
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If 1495 J of heat is needed to raise the temperature of a 319 g sample of a metal from 55.0°C to 66.0°C, what is the specific heat capacity of the metal?
Trans-2-butene does not exhibit a signal in the double-bond region of the spectrum (1600–1850 cm−1); however, ir spectroscopy is still helpful in identifying the presence of the double bond. identify the other signal that would indicate the presence of a c=c bond.
Trans-2-butene's C=C double bond can be indicated by IR absorption signals of C-H stretching near 3100 cm⁻¹ for the =CH₂ group, 3020 cm⁻¹ for the –CH= group and C-H out-of-plane bending near 915 cm⁻¹ and 1000 cm⁻¹
To indicate the presence of a C=C double bond in trans-2-butene despite the absence of a distinct signal in the double bond region of the infrared spectrum (1600–1850 cm−1), one would look for other characteristic IR absorption signals. These include the C-H stretching vibrations associated with alkenes, found around 3100 cm⁻¹ for the =CH2 group and around 3020 cm⁻¹ for the –CH= group. Additionally, the out-of-plane bending vibrations of the C-H bonds at the terminal =CH2 group occur near 915 cm⁻¹ and those of the –CH= grouping near 1000 cm⁻¹. These peaks would be indicative of the alkenic C-H bonds as opposed to alkane C-H stretches, which occur at slightly different frequencies.
Question 7 unsaved liquid water can store more heat energy than an equal amount of any other naturally occurring substance because liquid water question 7 options: 1) covers 71% of earth's surface 2) has its greatest density at 4°c 3) has the higher specific heat 4) can be changed into a solid or a gas
A small 23 kilogram canoe is floating downriver at a speed of 1 m/s. What is the canoe's kinetic energy?
Pentane (c5h12) undergoes combustion with excess oxygen to produce water and carbon dioxide. how many liters of water are produced when 50.5 grams of pentane combustion with excess oxygen at stp?
Write the lewis structure for mgi2. draw the lewis dot structure for mgi2. include all lone pairs of electrons.
The Lewis structure for MgI2 shows 3 lone pairs of electrons on each I atom and no lone pairs on the Mg atom.
Explanation:The Lewis structure for MgI2 can be drawn by following a few steps:
Calculate the total number of valence electrons for MgI2.Put the least electronegative atom, Mg, in the center and put the I atoms around it.Connect the central atom (Mg) to each of the I atoms using a single bond. This will account for 2 electrons.Place the remaining electrons as lone pairs around the I atoms.If any electrons remain, place them as lone pairs around the central Mg atom.The final Lewis structure for MgI2 will have 3 lone pairs of electrons on each I atom and no lone pairs on the Mg atom.
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Now, imagine a cow who eats grass (which is mostly non- digestible cellulose) all day long. How does a cow get any energy out of that cellulose?
Cows can derive energy from cellulose-rich grass due to the presence of symbiotic bacteria in their digestive system, which secrete an enzyme called cellulase, breaking down cellulose into usable glucose monomers. Their multiple-chambered stomach and appendix further facilitate cellulose digestion. This unique adaptation allows cows and other ruminants to utilize cellulose as an energy source.
Explanation:Cows and other herbivores are able to derive energy from cellulose-rich grass due to symbiotic bacteria that reside in their rumen, a part of their digestive system. These bacteria secrete an enzyme called cellulase which breaks down cellulose into glucose monomers, providing a viable energy source for the animal. Herbivores, such as cows, buffalos, and horses, possess a multiple-chambered stomach where cellulose digestion mostly occurs, and also an appendix where bacteria help in further breaking down cellulose.
Cellulose is composed of glucose monomers packed tightly as extended long chains, giving it its high tensile strength and rigidity, an important attribute for plant cells. It's interesting to note that every other glucose monomer in cellulose is flipped over, which adds to its complexity and indigestibility in many animals including humans. However, the unique digestive system of ruminants, rooms for cellulase-secreting bacteria such as those in the rumen and appendix, enable them to utilize cellulose as an energy source.
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Which formula represents an organic compound?cah2c4h8h2o2p2o5?
What is the molecular geometry around each carbon atom in a saturated hydrocarbon?
the molecular egometry around each carbon atom in a staurated hydro carbon is tetrahydral
Chemistry to make tomato soup, you add one can of water to the condensed soup. why is this dilution?
Which of the following are indicators of a chemical change? Select all that apply. color change temperature change precipitate formation gas formation cutting a solid into smaller pieces
Answer: color change , temperature change, precipitate formation, gas formation
Explanation:
A physical change is defined as the change in which shape, size of the atoms change. No new substance gets formed in these reactions.
Example: cutting a solid into smaller pieces
A chemical change is defined as the change in which change in chemical composition of atoms takes place. A new substance is formed in these reactions.
Characteristics of chemical reaction:
1. Change in color
2. Formation of precipitate
3. Energy is lost or absorbed
The ability to attract an electron for bonding is called:
A. Electrostatic attraction
B. Electronegativity
C. Delocalized electron attraction
D. Polar bonding
The ability to attract an electron for bonding is called Electronegativity. Hence, option C is correct.
What is an atom?An atom consists of a central nucleus that is usually surrounded by one or more electrons.
Electronegativity is a measure of an atom's ability to attract shared electrons to itself.
The more strongly an atom attracts the electrons in its bonds, the larger its electronegativity.
Hence, option C is correct.
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Choose the molecule or compound that exhibits dispersion forces as its strongest intermolecular force.choose the molecule or compound that exhibits dispersion forces as its strongest intermolecular force.cohbrcl2naclall of these have intermolecular forces stronger than dispersion.
Chlorine (Cl2) exhibits dispersion forces as its strongest intermolecular force. HBr exhibits dipole-dipole forces, and Co and NaCl show stronger forms of bonding (metallic and ionic, respectively). Larger, heavier atoms or molecules generally display stronger dispersion forces due to their greater number of electrons.
Explanation:The molecule or compound that exhibits dispersion forces as its strongest intermolecular force among Co, HBr, Cl2, and NaCl is Cl2. Dispersion forces are the only type of intermolecular force that occurs between noble gas atoms and nonpolar molecules such as Cl2. They arise as a result of fluctuations in electron density in an atom or molecule, that create temporary regions of positive and negative charge. These forces can attract nearby oppositely charged regions in neighboring molecules.
In the provided list, Hydrogen Bromide (HBr) exhibits dipole-dipole forces which are stronger than dispersion forces because it's a polar molecule. Cobalt (Co) is a metal and exhibits metallic bonding which is stronger than the dispersion forces. Sodium chloride (NaCl) forms an ionic compound and hence shows ionic bonding, which is much stronger than the dispersion forces.
Molecules with larger and heavier atoms, like chlorine (Cl2) , generally exhibit stronger dispersion forces compared to the smaller and lighter atoms, because of the presence of more electrons that can create temporary poles. At room temperature, Cl2 is a gas, but its dispersion forces allow it to condense into a liquid or solid under the right conditions.
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One mole of air at 310 k confined in a cylinder under a heavy piston occupies a volume of 4.9 l. the heat capacity of air under constant volume is 5 2 r. find the new volume of the gas if 3.9 kj is transferred to the air. answer in units of l
An empty 10 ml volumetric flask weighs 10.2634 g. when filled to the mark with distilled water and weighed again in the air at 20 oc, the mass is 20.2144 g. what is the true volume of the flask at 20 oc?
Explanation:
It is known that density of water at [tex]20^{o}C[/tex] is 998,29 [tex]kg/m^{3}[/tex] or 0.998 g/ml (as 1 [tex]kg/m^{3}[/tex] = 0.001 g/ml).
Therefore, calculate mass of water as follows.
Mass of water = Final mass - initial mass
= 20.2144 g - 10.2634 g
= 9.951 g
As we known that density is the amount of mass present in a unit volume.
Mathematically, Density = [tex]\frac{mass}{volume}[/tex]
Therefore, putting the given values into the above formula we will calculate the volume as follows.
Density = [tex]\frac{mass}{volume}[/tex]
0.998 g/ml = [tex]\frac{9.951 g}{Volume}[/tex]
Volume = 9.97 ml
Thus, we can conclude that volume of the flask at [tex]20^{o}C[/tex] is 9.97 ml.
The true volume of the flask at 20°C is 8.30145 mL.
The true volume of the flask can be calculated using the difference in mass before and after adding water.
Weigh the empty flask: 10.2634 gWeigh the filled flask: 20.2144 gSubtract the mass of the empty flask from the mass of the filled flask to get the mass of the water added: 20.2144 g - 10.2634 g = 9.9510 gSince 1 mL of water weighs 1 g, the volume of water added is 8.30145 mLTherefore, the true volume of the flask at 20°C is 8.30145 mL.
Correct question is: An empty 10 ml volumetric flask weighs 10.2634 g. when filled to the mark with distilled water and weighed again in the air at 20°C , the mass is 20.2144 g. What is the true volume of the flask at 20°C ?
131i has a half-life of 8.04 days. assuming you start with a 1.53 mg sample of 131i, how many mg will remain after 13.0 days __________?
a.0.835
b.0.268
c.0.422
d.0.440
e.0.499
0.499 mg will remain after 13.0 days. So, the correct answer is (E).
What is Half life?The time which is required for a quantity to reduce to half of its initial value is defined as Half life. This is commonly used in nuclear physics to for the description of unstable atoms undergo radioactive decay or how much time stable atoms survive.
Formula for Half Life,
t1/2 = ln 2 / λ
where,
t1/2 is half-life
λ is radioactive decay constant
For given information,
here, t1/2 = 8.04 days
so, 8.04 days = ln 2 / λ
λ = ln 2 / 8.04 days
As per Radioactive decay law,
[tex]N_t = N_o[/tex]e∧(-λt)
where,
[tex]N_t[/tex] is amount of compound at t time,
[tex]N_o[/tex] is amount of compound at t = 0 time
t is time taken to decay
λ is radioactive decay constant.
[tex]N_o[/tex] = 1.53 mg
λ = ln 2 / 8.04 days = 0.693 / 8.04 days
t = 13.0 days
By substituting,
[tex]N_t[/tex]= 1.53 mg e∧{(-0.693/8.04 days) x 13.0 days)}
[tex]N_t[/tex] = 0.4989 mg = 0.0.499 mg
Hence, mass of remaining sample after 13.0 days = 0.499 mg
Thus, 0.499 mg will remain after 13.0 days. So, the correct answer is (E).
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a substance with a higher specific heat will take more energy to raise its temperature ?
True or False
Answer:
True
Explanation:
Which metal can replace Cr in Cr2O3
Answer:
Aluminium.
Explanation:
Hello,
In this case, the most appropriated metal turns out being the Aluminum since it is higher in the activity series than nickel. Don't forget that activity series is an empirical tool used to predict products in displacement reactions and reactivity of metals with water and acids in replacement reactions and ore extraction.
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Write the overall equation for the conversion of pyruvate to acetyl coa. express your answer as a chemical equation.
Final answer:
The conversion of pyruvate to acetyl CoA is represented by the equation: C3H3O3- + CoA-SH + NAD+ → CH3-C-S-CoA + CO2 + NADH + H+. This step catalyzed by the pyruvate dehydrogenase complex involves oxidative decarboxylation and connects glycolysis to the Krebs cycle.
Explanation:
The conversion of pyruvate to acetyl CoA is a critical step that links glycolysis, the initial phase of glucose catabolism, to the Krebs cycle, where further energy extraction occurs. The overall chemical equation representing the conversion of pyruvate (a three-carbon molecule) to acetyl CoA (a two-carbon molecule) is:
C3H3O3- (pyruvate) + CoA-SH + NAD+ → CH3-C-S-CoA (acetyl CoA) + CO2 + NADH + H+
This process, known as pyruvate oxidation, is catalyzed by the multi-enzyme complex pyruvate dehydrogenase. It involves the oxidative decarboxylation of pyruvate, resulting in one molecule of carbon dioxide and the reduction of NAD+ to NADH. The transferred acetyl group is then bound to Coenzyme A, forming acetyl CoA, which subsequently enters the Krebs cycle within the mitochondria.
What is the mass in grams of na 2 co 3 (s) (molar mass = 105.98 g/mol) that, when dissolved in 125 ml of water, will make a 0.15 m aqueous solution?
Answer:
[tex]m_{Na_2CO_3}=2.0gNa_2CO_3[/tex]
Explanation:
Hello,
In this case, we consider the equation defining molarity, in order to compute the mass that is present into 125 mL of an aqueous 0.15M of sodium carbonate (solute), Na₂CO₃ as shown below:
[tex]M=\frac{n_{solute}}{V_{solution}}[/tex]
Now, since the unknown is the mass which comes from the moles, by solving for it and subsequently using its molar mass, one obtains:
[tex]m_{Na_2CO_3}=125mL*\frac{1L}{1000mL}*0.15\frac{mol{Na_2CO_3}}{L}*\frac{105.98gNa_2CO_3}{1mol{Na_2CO_3}} \\m_{Na_2CO_3}=2.0gNa_2CO_3[/tex]
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what is the density of a smaple if it weight 3.5 grams and has a volume of 2cm^3
A stock bottle of concentrated hydrochloric acid is a 37% (w/w) hcl solution. what is the molarity of this solution? how many moles of hcl are in a 10 ml sample of this concentrated acid? the density of 37% hcl is 1.19 g/ml.
What is the ph of a 0.45 m solution of aniline (c6h5nh2)? (pkb 9.40)?
The pH of a 0.45 M solution of aniline (C6H5NH2) is 9.4.
Explanation:The pH of a 0.45 M solution of aniline (C6H5NH2) can be calculated using the given pKb value of 9.40.
To find the pH, we need to find the pOH first using the pKb value:
pOH = 14 - pKb = 14 - 9.40 = 4.6
Then, we can use the equation pH + pOH = 14 to find the pH:
pH = 14 - pOH = 14 - 4.6 = 9.4
Therefore, the pH of the solution is 9.4.
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The pH of a 0.45 M solution of aniline, given that its pKb is 9.40, is calculated to be approximately 10.99 after taking into account the equilibrium constant Kb for aniline and the concentration of OH- ions introduced on the ionization of aniline.
Explanation:To calculate the pH of a 0.45 M solution of aniline (C6H5NH2), we need to take into account its pKb value, 9.40. Aniline is a weak base, and we can use the formula pOH = pKb - log[(base)/(acid)]. First, we have to calculate the equilibrium constant Kb for aniline which is Kw/Ka = 10^-14 / Ka. We know Ka equals 10^-5.6, hence Kb for aniline = 10^-14 / 10^-5.6 = 4.3 × 10^-10.
Next, using an approximation approach and the ICE table, we calculate the concentration of OH- introduced by aniline when it ionizes, and find it to be roughly 9.7 × 10-4 M. The pOH of the solution is then -log(9.7 × 10-4) which equals 3.01. To get the pH, we subtract this from 14 (since pH + pOH = 14), yielding a pH for the solution of approximately 10.99.
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a gas occupies 3.5 l at standard presure. find the volume of the gas when the pressure is 1140 mm hg
The question concerns Boyle's Law in physics, which states that pressure and volume of a gas are inversely related at a constant temperature. Using the provided initial conditions and the final pressure, the final volume of the gas can be calculated using Boyle's Law to be approximately 2.33 L.
Explanation:The subject matter of this question falls under the concept of gases in Physics, especially where Boyle's Law is applicable. Boyle's Law states that the pressure (P) and volume (V) of a gas have an inverse relationship when the temperature is kept constant. In other words, an increase in pressure causes a decrease in volume and vice versa.
To solve the student's question, we'll use the equation of Boyle's Law: P1*V1 = P2*V2, where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume.
In this case, the standard pressure (P1), which is generally 760 mm Hg, and the initial volume (V1) is 3.5 L. The final pressure, P2, is given as 1140 mm Hg, and we need to find the final volume (V2).
Substituting the values we know into the Boyle's Law equation: (760mm Hg * 3.5 L) = (1140 mm Hg * V2) Solving for 'V2' gives us a final volume of approximately 2.33 L. Therefore, the volume of the gas when the pressure is 1140 mm Hg will be about 2.33 L.
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Fe2o3 (molar mass = 159.7 g/mol) reacts with co (molar mass = 28.0 g/mol) according to the equation fe2o3(s) + 3 co(g) → 3 co2(g) + 2 fe(s). when 352 g fe2o3 reacts with excess co, how much fe (iron) is produced? 1. 4.41 mol fe 2. 0.907 mol fe 3. 147 g fe 4. 25.1 mol fe
When 352 g of Fe₂O₃ reacts with excess CO, it produces 4.41 mol of Fe.
To determine how much Fe (iron) is produced when 352 g of Fe₂O₃ reacts with excess CO, follow these steps:
Calculate moles of Fe₂O₃:
The molar mass of Fe₂O₃ is 159.7 g/mol.
Moles of Fe₂O₃ = 352 g / 159.7 g/mol = 2.20 mol Fe₂O₃.
Determine the mole ratio of Fe₂O₃ to Fe using the balanced equation:
The balanced equation is Fe₂O₃ + 3CO → 3CO₂ + 2Fe.
1 mol of Fe₂O₃ produces 2 mol of Fe.
Calculate moles of Fe produced:
Moles of Fe = 2.20 mol Fe₂O₃ * 2 mol Fe / 1 mol Fe₂O₃ = 4.40 mol Fe.
Convert moles of Fe to grams:
The molar mass of Fe is 55.85 g/mol.
Mass of Fe = 4.40 mol * 55.85 g/mol = 245.74 g of Fe.
The correct answer is option 1: 4.41 mol Fe.
On a piece of paper, calculate the number of moles of kool-aid® powder needed to make 100 ml of a 0.1 m solution.
Why do all humans have similar features? A. They have the same number and kinds of chromosomes. B. They have identical alleles. C. They have different alleles. D. Their genes do not allow for any variation.
a waxing moon means the moon is becoming a waht
A waxing moon means that the moon is increasing in the illuminated portion visible from Earth, growing each day from a new moon to a full moon. In contrast, the waning moon is decreasing in illumination following the full moon.
A waxing moon indicates that the moon is increasing or growing larger. This occurs during the portion of the lunar cycle from the new moon to the full moon. As the moon waxes, the lighted portion that is visible from Earth gets larger each day. For example, during the waxing gibbous phase, more than half but less than all of the moon's near side is illuminated, and it keeps growing until it is a full moon.
In contrast, a waning moon is one that is decreasing or growing smaller, which happens during the portion of the lunar cycle when the lighted portion seen from Earth gets smaller each day after the full moon. Notably, the waxing and waning periods of the lunar cycle each last about 14.8 days within the roughly 29.5-day lunar month.