Answers
The amount of energy that is required to change 20.0 g of an unknown substance from -15.0 °C to 7.0 °C is q = +49.65 kJ.
What is energy?Energy is the ability to do tasks. It can exist in various forms, including potential, kinetic, thermal, electrical, chemical, and nuclear.
At -15°c, it will be solid, to increase the amount of heat to raise
temp from -15°C to 40°C.
(20.0) (3.3J/g°c) x 15°C) = 330 J.
At -10°C, it is in which phase transformation takes place from sold to wound.
ΔHfue = 0.945 J/gx 20g = 18.93.
After that, it will be in want and it will be in liquid form 40°C.
To 7°C, then.
922 m Cgas 47
=(20g) (1455/g°c) (17)
493005.
Total Energy = q1 + ΔHfus + q2
47 = 7.0°C - 10°C) = 14°C -
2 330J18.95 + 49300J
q = 49648.9 3. 9
q = +49.65 KJ
Therefore, the amount of energy is q = +49.65 KJ.
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Related Questions
write the chemucal equation of a0.036MHNO2 Solution
Answers
The chemical equation of the dissociation of 0.036M HNO₂ solution is given below:
HNO₂ (aq) ⇄ H⁺ (aq) + NO₂⁻ (aq)What is a chemical equation?A chemical equation is an equation that uses the formula of compounds to show the reaction between substances to form products.
In a chemical equation, the reactants are written on the left-hand side of the equation, while the products are written on the right-hand side of the reaction.
Chemical equations are balanced by adding numerical coefficients in front of the compounds.
An example of a chemical equation is the equation of the dissociation of the acid nitrous acid, HNO₂.
HNO₂ (aq) ⇄ H⁺ (aq) + NO₂⁻ (aq)The acid, nitrous acid, HNO₂ is a weak acid that dissociates partially to produce hydrogen ions.
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Identify the options below that are not true of standard cell potentials Select all that apply: A galvanic cell generates electric current spontaneously only if the cell potential is positive The anode is the species with the greater standard reduction potential. Standard cell potential is dependent on the stoichiometry of the overall reaction. Agalvanic cell generates electric current spontaneously only if the cell potential is negative.
Answers
The options which are not true of standard cell potentials are the anode are option B, C, and D.
The standard cell potential refers to the potential difference between the cathode and anode and measures the potential of equilibrium. The standard potentials are all measured at 298 K, 1 atm, and with 1 M solutions. In a galvanic cell, current is generated when electrons flow externally through the circuit from the anode to the cathode due to a difference in potential energy between the two electrodes in the electrochemical cell. A galvanic cell generates electric current spontaneously if its cell potential is positive. Standard cell potential is determined calculated as the standard reduction potential of the cathode minus the standard reduction potential of the anode. The cathode is always the species with the greater standard reduction potential, while the anode is the species with the lower standard reduction potential. The reduction potentials are not scaled by the stoichiometric coefficients when calculating the standard cell potential.
Note: The question is incomplete. The complete question probably is: Identify the options below that are not true of standard cell potentials Select all that apply: A) A galvanic cell generates electric current spontaneously only if the cell potential is positive. B) The anode is the species with the greater standard reduction potential. C) Standard cell potential is dependent on the stoichiometry of the overall reaction. D) A galvanic cell generates electric current spontaneously only if the cell potential is negative.
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true or false, gravity only acts on heavy objects
Answers
Answer: False
Explanation: Certain types of rocks are light and gravity can hold them down,
For example: A pencil is on the desk due to the gravity pulling it down.
=)
Calculate the bond dissociation energy for a N-H bond in NH3 using the information from the following reaction and the data provided.
Bond Bond Energy (kJ/mol)
C-H 414
C-C 347
Câ¡N 894
O-H 464
C=O 736
C-O 360
A. 543 kJ
B. 80 kJ
C. 389 kJ
D. 834 kJ
E. 1167 kJ
Answers
The bond dissociation energy of 543 kJ/mol for a N-H bond in NH3. Hence, the answer is A. 543 kJ.
The bond dissociation energy for a N-H bond in NH3 can be calculated using the information from the following reaction and the data provided. The equation for the reaction is:
NH3 → H2 + N.
The bond dissociation energy for a N-H bond in NH3 can be calculated by subtracting the sum of the bond energies of the C-H and C-C bonds in NH3 from the sum of the bond energies of the O-H and C=O bonds in H2 and N.
The bond energies of the C-H and C-C bonds in NH3 are 414 kJ/mol and 347 kJ/mol, respectively. The bond energies of the O-H and C=O bonds in H2 and N are 464 kJ/mol and 736 kJ/mol, respectively.
Therefore, the bond dissociation energy for a N-H bond in NH3 can be calculated by subtracting the sum of 414 kJ/mol and 347 kJ/mol from the sum of 464 kJ/mol and 736 kJ/mol.
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The first five ionization energies of an unknown element are listed in the table above. which of the following statements correctly identifies the element and cites the evidence supporting the identification?
Answers
B) Al because the large difference between the third and forth ionization energies.
What is ionization energy?
Ionization energy (also called ionization potential) is the amount of energy required to remove an electron from an isolated atom or molecule in chemistry and physics. There is an ionization energy for each successively removed electron. However, the ionization energy associated with the removal of the first (most loosely held) electron is most commonly used.
The ionization energy of a chemical element, expressed in joules or electron volts, is usually measured in a discharge tube in which rapidly moving electrons produced by an electric current collide with gas atoms of the element, releasing one of them will be electronic.
B) Al because the large difference between the third and forth ionization energies.
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What is Kp for the following reaction:
Cl2(g) + I2(g) -> 2ICl(g) ∆Gorxn = -27.9 kJ
Answers
The Kp of the reaction is 7.8 * 10^4.
What is the Kp?We know that the equilibrium constant of the reaction has to do with the manner in which the reactant can nbe able to be converted into products. In this case, we are looking at the reaction in which we are having the production of the ICl molecule.
Let us recall that;
∆G = -RTlnK
∆G = change in free energy
R = gas constant
T = absolute temperature
K = equilibrium constant.
When we substitute the values, we would now have;
lnKp =∆G/-RT
lnKp = -27.9 * 10^3/-(298 * 8.314)
lnKp = 11.3
Kp = 7.8 * 10^4
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which of the following functional groups generally causes a compound to have the HIGHEST boiling point, assuming the molecular weight is constant?
carboxylic acid, amide, alcohol, nitrile, or ester
Answers
The carboxylic acid are the functional groups generally causes a compound to have the HIGHEST boiling point, assuming the molecular weight is constant.
Carboxylic acids have better boiling factors than aldehydes, ketones or even alcohols of similar molecular mass. It is because of their. More large affiliation of carboxylic acid thru van der Waals pressure of attraction.
Carboxylic acids have better boiling factor than carbonyl compounds and alcohols because of the presence of intramolecular hydrogen bonding. Since carboxylic acids can shape a couple of set of hydrogen bonds, their boiling factors are typically better than the ones of different molecules of the identical molecular weight (MW). This could bring about a better temperature at which boiling could occur. We can see that the most important carboxylic acid from our solution alternatives is pentanoic acid.
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Which of these statements correctly describes the electronic charge distribution in a molecule? I. The charge density around each atom is the same as it is in the free atom. II. The electronic charge is distributed equally around each atom in the molecule. III. Electrons are attracted preferentially to atoms with high electronegativity. IV. Electronic charge density is enhanced in the space between atoms to form a bond. V. Electrons are always shared between atoms and never transferred from one atom to another. a. I only b. II and III only c. III and IV only d. II only e. V only
Answers
statement correctly describes the electronic charge distribution in a molecule-Option 2 The electronic charge is distributed equally around each atom in the molecule.
When charged matter is positioned in an electromagnetic field, it encounters a force due to its physical property of electrical charges. A positive or negative electric charge can exist (commonly carried by protons and electrons respectively). Like charges repel each other and, while unlike goods become more expensive one another. Coulomb, unit of electrical charges in the m long system, which serves as the foundation for the SI physical unit. C is the abbreviation. The coulomb is defined as the amount of electricity transferred in one second by a one-ampere current. Charge (exhibited by protons) and negative charge are indeed the two types of charge (exhibited by electrons.
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write the comparison between daltons atomic theory and modern atomic theory?
Answers
Dalton’s atomic theory is the oldest theory about the atom. In 1808, John Dalton published his theory, which was composed of several postulates that were built based on his experiments and laws of chemical combination. A number of scientists later contributed to the development of modern atomic theory, which is different from Dalton’s atomic theory and has more advanced facts about the atom and its behavior. The key difference between Dalton’s Atomic Theory and Modern Atomic Theory is that the structure and properties of atom according to Dalton’s theory are different from the structure and properties proposed by the modern atomic theory.
Difference :Dalton’s atomic theory is a theory about indivisible particles called atoms which are the smallest particles of all matter. Modern atomic theory is the theory that explains the fully detailed structure of an atom.
Structure of AtomAccording to Dalton’s atomic theory, atoms are indivisible particles. Modern atomic theory says that atoms are composed of subatomic particles; protons, electrons, and neutrons.
IsotopesDalton’s theory does not explain details about isotopes. It states that all atoms of the same element are identical. Modern atomic theory explains details about isotopes having a different number of neutrons and the same number of protons.
ElectronsDalton couldn’t give details about electrons. Modern atomic theory explains the location, reactions, and behavior of electrons.
Chemical ReactionsDalton’s atomic theory explains that atoms are the smallest particle that can be engaged in reactions. Modern atomic theory states that subatomic particles can participate in reactions.
2 of the same type of questions. Will give lots of points and mark as brainliest!!!! Anything helps! Thanks in advance :)
Answers
Answer:
14. 2NH4Cl(aq) + K2S(aq) => 2KCl(aq) + (NH4)2S(aq)
15. 3KCl(aq) + Na3PO4(aq) = 3NaCl(aq) + K3PO4(aq)
Explanation:
14. 2NH4Cl(aq) + K2S(aq) => 2KCl(aq) + (NH4)2S(aq)
NH4 = 2
Cl = 2
K = 2
S = 1
15. 3KCl(aq) + Na3PO4(aq) = 3NaCl(aq) + K3PO4(aq)
K = 3
Cl = 3
Na = 3
PO4 = 1
20 PTS Which explains the differences in the distribution of solar energy on Earth's surface? (1 point)
A. Earth’s climate system determines how much energy is absorbed from the sun.
B. Earth’s gravitational force pulls the sun’s rays away from the equator.
C. Earth’s solar energy is dependent on air currents.
D. Earth’s curved shape and tilt on its axis do not allow the sun’s rays to fall evenly on its surface.
Answers
The differences in the distribution of solar energy on Earth's surface is due to Earth’s curved shape and tilt on its axis do not allow the sun’s rays to fall evenly on its surface.
The correct option is D.
What is solar energy?Solar energy refers to the energy produced by the Sun.
Solar energy is in the form of heat energy, light energy, and ultraviolet radiation.
The shape of the affects the amount of solar energy that reaches any region of the earth. The earth is spherical in shape. Hence, there is an uneven distribution of solar energy from the sun o the Earth. also, the tilt of the earth affects the amount of solar energy that reaches any region of the earth.
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Aloud is an astronomer. He is trying to find evidence that a galaxy has supermassive black hole at its center. What should he look for? A. Neutron star B quasar C pulsar D black matter
Answers
Aloud is trying to find evidence that a galaxy has supermassive black hole at its center. He should look for the black matter in the center of the Earth. Thus, the correct option is D.
What is the Black matter?Black matter or dark matter is composed of the particles which do not absorb, reflect, or emit light rays, so they cannot be detected by observing electromagnetic radiations. Dark matter is the material which cannot be seen directly through the eyes.
Dark matter play an important role in the formation of galaxies. Many researchers use the astronomical surveys to build maps of the location where dark matter in the universe is found based on how the light from the distant galaxies bends as it travels to us.
Thus, the matter which fall into a black hole arranges itself in the shape of a disk which is thick at the outer edge, while it is thin along the inner ring of the disk.
Therefore, the correct option is D.
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When analyzing allylic halogenation reactions of alkenes using nbs and light, the predominant product is the one that derives from reacting bromine at the site of the radical indicated by the most stable allyl radical intermediate contributing structure.
TRUE OR FALSE
Answers
True. The product that results from the reacting bromine is the dominating one when NBS and light are used to study allylic halogenation processes of alkenes.
Describe allylic.A carboxyl group is referred to as allylic and vinylic carbon if it is indirectly or directly attached with a double bonds in a structure. Vinylic charcoal comprises one of the atomic nuclei that create (or share) double bond, which is the primary differential among allylic versus vinylic carbon.
What does allylic impact mean?A chemical process known as an allylic reorganization or allylic shift occurs if the double binding in an allyl pharmaceutical molecule moves to the following carbon atom. In nucleophilic attack, it occurs.
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Why do sodium and chlorine have the same shielding effect
Answers
Sodium and chlorine have the same shielding effect because they have the same number of innermost electrons that shield their valence electrons.
What is the shielding effect of an element?The shielding effect of an element is the electron shielding effect that valence electrons experience from the attraction of the positively-charged nucleus as a result of the inner electrons in the element.
The completely filled electron shells in the interior of an atom of an element shield or protect the electron found in the valence shell or outermost shell.
Considering why sodium and chlorine have the same shielding effect:
The electronic configuration of sodium and chlorine are 2, 8, 1 and 2,8, 7 respectively.
They both have 10 innermost electrons that shield their valence electrons.
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Provided below is the IR and 'H NMR for a compound having the molecular formula of C,H,O, Using this information, determine the degrees of unsaturation for this structure and solve and draw the structure responsible for these spectral data. To validate your answer, you need to assign the type of bond (ie, stretch) responsible for each peak highlighted by a box in the IR. You must also assign each 'H NMR peak (a)-(e) to the correct set of protons in your proposed structure. The integration for each peak has been provided for you. You must label the multiplicity observed for each peak. Is your structure consistent with all of this data? If not, chances are you do not have the correct structure, or the peaks have been assigned incorrectly. In your peer review, offer feedback concerning the accuracy of the submitted structures and spectral assignments. If you believe the answers are incorrect, then you need to provided explanation. In the end, you should all be getting the same correct structure. Please draw the final structure in the box provided underneath the NMR. TH NMR - for clarity, expansions have been provided for peaks that are not a singlets. Proposed Structure: Remember to assign it to the NMR per instructions. IR FREQUENCY TABLE (in wavenumber) Frequency Range (om ) Intensity Group A. Alky! C-H (stretching) Isopropy. -CH(CH), tert-Butyl, -C(CH) ( -5) and 2853-2002 1380-1385 1365-1370 1385-1395 - 1366 (m) and B. Alkenyl C-H(stretching) C- (stretching) R-CH-CH, m) (v) 3010-3095 1620-1600 085-1000 905-920 80-900 (6) (out of plane >C-H bondinga) and BCHCH cafe Esses se s8 s (8) 675-730 960-975 (6) (s) -3300 2100-2260 (8) () cle-RCH-CHR trans-RCH-CHR C. Alkyny! C H (stretching) C-C (stretching) D. Aromatic Ar-H(stretching) Aromatic substitution type (C-Hout-of-plane bendings) Monosubstituted o-Disubstituted m-Disubstituted -3030 and (very s) (very s) (s) 690-710 730-770 735-770 680-725 750-810 800-860 and (very s) (very s) 3590-3650 3200-3550 2500-3000 (sharp ) (broad, s) (broad, p-Disubstituted E. Alcohol, Phenols, and Carboxylic Acids O H (stretching) Alcohols, phenols (dilute solutions) Alcohols, phenols (hydrogen bonded) Carboxylic acids (hydrogen bonded) F. Aldehydes, Ketones, Esters, and Carboxylic Acids C-O (stretching) Aldehydes Ketones Esters Carboxylic acids Amides G. Amines N- H H. Nitriles CON 1630-1780 1690-1740 1680-1750 1735-1750 1710-1780 1630-1690 (s) (s) (s) (s) (s) (5) 3300-3500 (m) 2220-2260 (m) weak edium w - variatie p rowity Abbreviations strong m NMR CHEMICAL SHIFT TABLE (in ppm) CHARACTERISTIC PROTON CHEMICAL SHIFTS Type of Preton Structure Chemical Shin, ppm Cycopropane CHE Primary R-CH Secondary R-CH: Tertiary R; C-11 Vinylic C=C-H Acetylanic triple bond.CC-H Aromate Ar-H Benzyle Arc- Allylic CHCCH Fluorides H-C-F Chlorides H-C-a Bromides H-C-Br Iodides H-C- Alcohol H-C-OH Ethors H-C-OR 33-4 Esters RCOO-C- 3.7-4.1 Esters H-C-COOR 2-22 Acids H-C-COOH 2-26 Carbonyl Compounds H-C-C-0 2-27 Aldehydie R-CH-)C=0 9-10 Hydroxylic R-C-OH 1-55 Phenolie Ar-OH 4-12 Enolic C-C-OH 15-17 Carboxylic ROOOH 10.5-12 Amino RNH, 1-5
Answers
The degree of unsaturation, C-H/2+1. and where C = no. of carbon, H = no. of hydrogen Molecular formula: C7H14O2, 7-14/2+1 = 1. Therefore structure will have one double bond or ring
IR analysis
the band at around 1700 cm-1 is due to the carbonyl group
the band at around 2850 - 2950 cm-1 is due to aliphatic CH stretching
(image) - LINK ATTACHED
1H NMR analysis
the triplet at 4.5 ppm is due to methylene proton attached to an oxygen
the singlet at 2.1 ppm is due to methyl proton attached to the carbonyl group
the quartet at around 1.55 ppm is due to methylene proton attached to another methylene group
the multiplet at 1.5 ppm is due to CH proton attached to two methyl group and one methylene group
the doublet at around 0.9 ppm is due to two methyl proton attached to CH
based on the above analysis the structure of the compound is - image
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Hess's Law states that the enthalpy change of an overall process is equal to the sum of the enthalpy changes of its individual steps.
Use the \Delta H data given to calculate the \Delta H for the reaction: C2H4 + H2 \Delta H\rightarrow C2H6
C2H6 + 3.5 O2 \rightarrow 2CO2 + 3H2O \Delta H= -1560 kj
C2H4 + 3 O2 \rightarrow 2CO2 + 2H2O \Delta H= -1411 kj
2H2 + O2 \rightarrow 2H2O \Delta H= -572 kj
\Delta H= ?
Answers
Delta H for the reaction: C2H4 (g) + H2 (g) --> C2H6 (g) is -137kJ
What does Hess's law indicate about a reaction's enthalpy?
According to Hess's law, all intermediate reactions that can be separated into the main reaction have standard enthalpies that add up to the same value when the main reaction is carried out at the same temperature.
If the initial and ending circumstances are the same, the enthalpy change for a reaction is independent of the number of ways a product might be produced. An exothermic process is indicated by a reaction's negative enthalpy change, whereas an endothermic process is shown by a reaction's positive enthalpy change.
C2H4 (g) + 3 O2 (g) --> 2 CO2 (g) + 2 H2O (l) Delta H = -1411. kJ
2 CO2 (g) + 3 H2O (l) --> C2H6 (g) + 3½ O2 (g) Delta H = +1560. kJ
H2 (g) + ½O2 (g) --> H2O (l) Delta H = -285.8 kJ
C2H4 (g) + H2 (g) --> C2H6 (g) Delta H = -137. kJ
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is the Halloween clock reaction a physical or chemical change
Answers
Answer:
IT IS A CHEMICAL CHANGE
Explanation:
The Old Nassau reaction or Halloween reaction is a chemical clock reaction in which a clear solution turns orange and then black
Answer:
It's a chemical change.
Explain what is wrong with the following electron configuration:
1s 2 2s 2 2p 6 3s 2 3p 6 4s 3 3d 10 4p 1
Answers
In the given electronic configuration, the 4 s subshell has 3 electrons which is not possible as the s subshell can accomodate a maximum of only two electrons.
What is electronic configuration?
Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
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balance the equation
Answers
The balanced form of the chemical equations given in the image are as follows:
Cu + 2H₂SO₄ → CuSO₄ + SO₂ + 2H₂O4Al + 3O₂ → 2Al₂O₃2Fe + 3Cl₂ → 2FeCl₃2C₂H₆ + 7O₂ → 4CO₂ + 6H₂OAl₂O₃ + 2NaOH + 3H₂O → 2Na(Al(OH)₄)Cu + 4HNO₃ → CU(NO₃)₂ + 2NO₂ + 2H₂O2F₂ + 2KOH → 2KF + F₂O + H₂OWhat is a balanced equation?A balanced chemical equation is an equation that obeys the law of conservation of mass i.e. the number of atoms of each element on both sides of the equation are the same.
A chemical equation is balanced with the aid of coefficients, which are numbers placed in front of each compound or element as a multiplying factor.
According to this question, some chemical equations were given in the image attached. The balanced form of these equations are in the main answer part.
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According to the National 4 chemistry text, reactive metals will quickly react with all three of the following:
A) Oxygen, water and weak acids
B) Hydrogen, helium and sulfuric acid
C) Water, hydrogen and hydrochloric acid
D) Salt, oxygen and strong bases
Answers
The reactive metals will quickly react with all three of the salt, oxygen, and strong bases. Therefore, option D is correct.
What are metals?Metal can be described as a material that, when freshly prepared, and polished shows a lustrous appearance, and conducts electricity and heat relatively well. Metals are typically ductile and malleable. These properties are the result of the metallic bond between the molecules of the metal.
Metal can be a chemical element such as iron and an alloy such as stainless steel, and a molecular compound such as polymeric sulfur nitride.
Metals are inclined to create cations through electron loss. Most will react with oxygen in the air to produce oxides. Some others, such as platinum, palladium, and gold, do not react with the atmosphere.
The oxides of metals are basic, as opposed to those of nonmetals are acidic or neutral. Therefore, reactive metals react with oxygen and strong bases.
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given the pathways of glycolysis and gluconeogenesis, identify regulatory steps, regulatory molecules, and whether the molecules are activators or inhibitors, especially molecules such as amp, atp, acetyl-coa, citrate, and fructose-2,6-bisphosphate.
Answers
Gluconeogenesis and glycolysis are mutually regulated. *AMP: Glycolysis is encouraged because cells need ATP. Citrate and acetyl-CoA reporting on the citric acid cycle. Because the cell is creating energy and intermediates for biosynthetic processes when [C] is high, gluconeogenesis is encouraged.
What do you call molecules?Any atoms joined by chemical bonds are referred to be molecules in general. A molecule consisting of atoms from several elements is referred to as a compound. Molecules make up all chemicals.
Is a person a molecule?The vast array of molecules that make up the human body are all combinations of just a few dozen basic constituents: the periodic table's chemical elements. But each atom's abundance is very different from the others.
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A 35.20 g sample of liquid antimony at 747.0 °C is poured into a mold and allowed to cool to 28.0 °C. How many kJ of energy are released in this process. Report the answer as a positive number.
boiling point = 1.440×103 °C delta16-1.GIFHvap(1.440×103 °C) = 1.605×103 J/g
melting point = 631.0 °C delta16-1.GIFHfus(631.0 °C) = 161.1 J/g
specific heat solid = 0.2090 J/g°C
specific heat liquid = 0.2590 J/g°C
Please help..I keep getting the wrong answer.
35.20g*(.2090/1)(631.0-747)= 40925.87
35.20g*(161.1/1)=5670.72
35.20g*(.2590/1)*(28.0-631.0)= -5497.4
41.09919 k/J is not the right answer...help?
Answers
A 35.20g sample of liquid antimony at 747.0 celcius. The heat released in the process in KJ is 11.
The given sample of liquid antimony is cooled from 747.0°C to 28.0°C
Since the melting point of antimony is 631.0°C, the liquid is cooled from 747.0°C to 631.0°C, then the phase of antimony is changed from liquid to solid at 631.0°C, and temperature of solid is changed from 63 1.0C to 631 .0°C
Specific heat of solid and liquid antimony is 0.2090J/g^0C and
and enthalpy of fusion at 631.0°C is 161.1 J/g.
Calculate the heat released in the overall procedure as follows:
Q=q^747.0° C to 631.0°C +Q solidifying at 631.0° C q631.0° C to 28.0°C
=mCΔT+(-mΔH^solidifying )+mcΔT
-35.20 gx0.2590 J/g°631.0°C-747.0°C)+(35.20 gx161.1 J/g)
=+35.20 g× 0.2090J/g^o C × (28.0°C-631.0°C)
=--1057.55 J -5670.72 J-4436.15 J
=11164.42 J
11.164 j
Hence, the heat released in the process in kJ is 11
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Your friend is having trouble writing the electron configuration for Nickel (Ni). In your own words describe how you would teach your friend how to write an electron configuration, and then write the configuration for Ni.
Answers
The electronic configuration of nickel is [Ar] 3d⁸ 4s².
What is electronic configuration?
The arrangement of electrons within an atom's orbitals is known as its electronic configuration. The atomic number, which is equal to the number of protons in every neutral atom, is the set quantity of electrons that make up each neutral atom.
What is Nickel ?
A hard silver-white metallic element that can be hammered into shape, polished to a high sheen, is resistant to wearing away, and is mostly utilized in alloys.
Therefore, the electronic configuration of nickel is [Ar] 3d⁸ 4s².
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Can you please help with number 30?
Answers
1. The water potential of the solution would be - 9.68 bars.
2. The net flow of water would be from the root into the solution.
What is water potential?The water potential of a solution is the tendency of water molecules to move from one solution into another solution when the two are separated by a selectively permeable membrane.
The solute potential of the solution can be calculated as:
solute potential = -iCRT. Where i is the van 't Hoff index, C is the molarity, R is the ideal gas constant, and T is the temperature in Kelvin.
For the solution, C = 0.4 M, T = 22 + 273 = 295 K
Solute potential = 1 x 0.4 x 0.082 x 295
= - 9.68 bars
Since the pressure potential of the solution is zero (no physical pressure is applied to the solution), the solute potential is the same as the water potential of the solution.
Now, the solution has a water potential of -9.68 bars while the root has a water potential of -5.4 bars. This means that the root has more water potential than the solution. Thus, water molecules will move from the root into the solution.
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What are the coefficients when the following equations are balanced? sb o2 --> sb4o6 h2s cl2 --> s8 hcl
Answers
The balanced reaction with correct coefficients for the given chemical reaction is given as,
4Sb + 3O₂ → Sb₄O₆
H₂S + Cl₂ → S + 2HCl
Balanced chemical equations are defined as the equations that have the same number and type of each atom on both sides of the equation. The coefficients in a balanced equation must be in the simplest whole number ratio. In a balanced chemical equation mass is always conserved.
The equation Sb + O₂ → Sb₄O₆ is written after balancing as 4Sb + 3O₂ → Sb₄O₆. Therefore, its coefficients are 4 and 3.
The equation H₂S + Cl₂ → S + HCl is written after balancing as H₂S + Cl₂ → S + 2HCl. Therefore, its coefficient is 2.
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the first reaction in the citric acid cycle is irreversible so once an acetyl-coa enters, the cycle, it must complete the cycle. true or false
Answers
Answer:
True
Explanation:
The first reaction in the Citric Acid cycle is the reaction between acetyl-CoA and oxaloacetate to form citrate. This reaction is irreversible, which means that once acetyl-CoA enters the cycle, it must complete the cycle. This step is irreversible because it is highly exergonic.
The following molecular equation represents the reaction that occurs when aqueous solutions of lead(II) nitrate and barium bromide are combined.
Pb(NO2)3(aq)+BaBr2(aq) = PbBr2(s)+Ba(NO3)2(aq)
Write the balanced net ionic equation for the reaction.
Answers
The balanced net ionic equation for the reaction that occurs when aqueous solutions of lead(II) nitrate and barium bromide is,
Pb2+ (aq.) + 2Br-(aq.) -------------> PbBr2
Lead(II) nitrate, Pb(NO3)2 and barium bromide, BaBr2, are soluble in aqueous solution. This which means that they dissociate completely to form cations and anions when dissolved in water.
Pb(NO2)3 (aq.) + BaBr2(aq.) -----------> PbBr2 (s) + Ba(NO3)2 (aq.)
Balanced net ionic equation for the reaction is the chemical equation that shows only those elements, compounds, and ions that are directly involved in the chemical reaction. Net ionic equations must be balanced by both mass and charge. Balancing by mass means ensuring that there are equal masses of each element on the product and reactant sides. Balancing by charge means making sure that the overall charge is the same on both sides of the equation.
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Calculate The De Broglie Wavelength Of A Neutron Traveling At 1% The Speed Of Light. Enter Your Answer In Picometers
Answers
Answer:
0.132 pm
Explanation:
De Broglie Wavelength is
[tex]{\displaystyle ~\lambda ={\frac {h}{mv}}.}[/tex]
or
wavelength = h / (m * v)
To calculate the De Broglie wavelength of a neutron traveling at 1% the speed of light, you will need to know the mass of the neutron and the speed of light. The mass of a neutron is about 1.675 x 10^-27 kilograms, and the speed of light is about 3.00*10^8 meters per second.
Plugging in these values, you get:
wavelength = 6.626 x 10^-34 J * s / (1.675 x 10^-27 kg * (0.01 * 3.00x10^8 m/s))
Simplifying this equation, you get:
wavelength = 1.3186x10^-13 meters
(1.3186x10^-13 meters) * (1 picometer / 10^-12 meter) =
0.132 picometers
Overall question: What is the molality of
a 3.25 M aqueous solution of ethanol,
C2H5OH?
From previous steps, you know:
Moles of ethanol = 3.25 moles
Mass of solvent = 828 g
m = [?]
mol C₂H5OH
kg H₂O
Molality (mol/kg)
Enter
Answers
Answer:
Explanation: Molar mass of ethanol = 46g/mole.
Moles of ethanol= 3.25 moles
Molality = moles of ethanol/ Mass of solvent in kg
Mass in kg = 828/1000kg=0.828
Molality= 3.25×0.828 Mol per kg
Molality=3.92 Mole/kg
m= mass of ethanol
moles= mass/molar mass
mass= moles ×molar mass
mass= 3.25×46= 149.5 gram
calcium+magnesium=
words only
Answers
Answer:
Calcium and magnesium do not combine or react with each other to form a compound. They are both alkaline earth metals, but they do not react with each other under normal conditions. It is possible to create a compound by combining them with other elements, but the specific compound would depend on the elements used. For example, calcium and magnesium can be combined with chlorine to form calcium chloride and magnesium chloride.