7.35 KJ energy is gives off when 1.00 g Fe is reacted with excess oxygen according to the reaction.
The reaction between Fe and O is as below :
4 Fe(s) + 3 O₂(g) → 2 Fe₂O₃(g)
here , Δ H = - 1652 KJ
The enthalpy change is -1658 KJ. It means the reaction gives off 1652 heat or energy.
Heat released when 1.00g of is reacted with excessive oxygen:
Moles of Iron (Fe) = [tex]\frac{1g}{56g/mol}[/tex] = 0.0178 mol
According to reaction, When 4 moles of an Iron (Fe) reacts with 3 moles of Oxygen (O) it gives 1652 Kilo Joules of Energy.
Then 0.0178 Moles of Iron (Fe) will give :
∴ [tex]\frac{1652 KJ}{4}[/tex] × 0.0178 = 7.35 KJ
So, 1.00 g of Fe reacts with an excess of oxygen to release 7.35 KJ of energy.
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HELP ASAPPPPPPPPPPPPPPPP PLEASEEEEE
Answers choices
AgNO3
Al2(SO4)3
BaCl2
K2CrO2
Mg(NO3)2
Na2CrO4
Na2SO4
According to the infrographic, what happens to carbon after trees respire?
A. It cleans the soil of fungi.
B. It is stored in the roots and branches
C. It is released into the atmosphere.
D. It is turned to sugar and minerals.
one ball of lead has a volume of 90 cm and a mass of 1,017g. a larger ball of lead has a volume of 250 cm and a mass of 2,825g. complete the calculations and state whether or not the density changes.
The density of the balls, given the masses and volume of each balls did not change
How do I know whether or not the density changes?To Know if there is a change or not, we shall determine the density of both lead balls. Details below:
For the small ball
Mass of small ball = 1017 gVolume of small ball = 90 cm³Density of small ball = ?Density = mass / volume
Density of small ball = 1017 / 90
Density of small ball = 11.3 g/cm³
For the larger ball
Mass of larger ball = 2825 gVolume of larger ball = 250 cm³Density of larger ball = ?Density = mass / volume
Density of larger ball = 2825 / 250
Density of larger ball = 11.3 g/cm³
From the above calculations, we obtained:
Density of small ball = 11.3 g/cm³Density of arger ball = 11.3 g/cm³Thus, we can conclude that the density of the lead balls did not change
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Table gives the composition of three particles
As per the given statements : 1. Particle A is an atom because it has protons, electrons and neutrons.2. A, B and C are all particles of the same element. No, A, B and C are not the particles of same element as there no. of electrons differ. 3.Particles A and C are isotopes of the same element. Yes.
What is an atom?The smallest unit of matter in which it can be broken without exhibiting any charged particle is termed as atom. atom is made up of three particles of which Proton (+ivly charged) and electron (-ivly charged) are charged particles while neutron is a neutral particle , doesn't have any charge.
Isotopes:They are the particles of same element and have same no . of protons and electrons i.e. is same atomic number but they differ in no. of neutrons.
So bcz of the above reason in statement three Particles A and C are isotopes of the same element is correct.
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draw the organic product formed when 1−hexyne is treated with h2o, h2so4, and hgso4. click the draw structure button to launch the drawing utility.
The organic product formed when 1−hexyne is treated with the H₂O, H₂SO₄ and HgSO₄ is 2 - hexanone.
The reaction of the 1−hexyne is treated with the H₂O, H₂SO₄ and HgSO₄ is given as :
CH₃- CH₂ - CH₂ - CH₂ - C ≡ CH + H₂O / H₂SO₄ / HgSO₄ ----->
1 - hexyne CH₃- CH₂ - CH₂ - CH₂ - CO - CH₃
2 - hexanone
Thus, the when the 1 - hexyne react with the H₂O, H₂SO₄ and HgSO₄ is 2 - hexanone the product is formed is known as the 2 - hexanone. the above is the reaction for the formation of 2 - hexanone.
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Using the following balanced equation, 2 moles of C2H6 will produce how many total moles of products?
2 C2H6 + 7 O2 → 4 CO2 + 6 H2O
a. 2
b. 10
c. 4
d. 6
Combustion reaction of ethane gas gives 4 moles of carbon dioxide and 6 moles of water. Thus, total number of moles of products is 10.
What is combustion?Combustion is the reaction of compounds with atmospheric oxygen to produce carbon dioxide and water. Hydrocarbon gases such as methane, ethane etc. easily burn in oxygen.
The balanced reaction of ethane gas C₂H₆ with oxygen is given here. 2 moles of ethane gas combines with 7 moles of oxygen gas forming 4 moles of carbon dioxide and 6 moles of water.
Here, all the elements of the reaction are balanced in each side and thus, the total number of moles of products is 4 + 6 = 10. Thus, option b is correct.
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What is the volume of 1.78 moles of nitrogen gas (N2) at STP
Answer:
[tex]\huge\boxed{\sf v = 39.872\ dm\³}[/tex]
Explanation:
Given data:Moles = n = 1.78 moles
Molar volume = V = 22.4 dm³
Required:Volume = v = ?
Formula:v = n × V
Solution:v = 1.78 × 22.4
v = 39.872 dm³[tex]\rule[225]{225}{2}[/tex]
Why would it not be pratical to use water for a barometer on a regular basis? what other liquid might be a good option?.
Therefore, if you utilise water, you must have a barometer that is 13.534 times the length of a mercury barometer, which may be longer than 11 metres.
Additionally, mercury can reach the same temperature of the atmosphere more quickly than water since it has a lower specific heat than water and is a better heat conductor.
What is Barometer?
Barometer, a tool for calculating atmospheric pressure. A barometer can also be used to determine height because air pressure varies with elevation above or below sea level. Mercury and aneroid barometers are the two primary varieties.
A mercury column whose height can be precisely measured is balanced by atmospheric pressure in a mercury barometer. Mercury barometers are frequently adjusted for the local gravity value and the surrounding temperature in order to boost their accuracy.
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the ease with which the charge distribution in a molecule can be distorted by an external electrical field is called the . the ease with which the charge distribution in a molecule can be distorted by an external electrical field is called the . electronegativity hydrogen bonding volatility viscosity polarizability
The ease with which the charge distribution in a molecule can be distorted by an external electrical field is called the polarizability.
The polarizability can be defined as the the tendency of the matter, when they are subjected to an electric field, the electron cloud of the matter will distorted. as the number of electrons increases the polarizability of the atom increases. the polarizability tells us that how the electrons distorted around the atom.
Thus, the more the polarizability , the more the stability of the anion. the larger the atom size , the electron will more away from the nucleus, the mores polarizable.
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2. How many moles of carbon dioxide gas are in 0.667 liters?
0.034 mol of carbon dioxide gas, are there in 0.667 L.
We can assume that the volume of one mole of any gas is 22.4 L we know that the pressure of the gas is 1 atmosphere and that the temperature of a gas is 0C
This type is called standard temperature and pressure (STP).
This can be calculated by using the formula in which we can find the moles:
PV =nRT------(1)
Where P is the pressure
V is volume
T is the temperature in Kelvin
R is the ideal gas constant consistent with the units of volume and pressure.
0.667 L x 1 mol/22.4 L = 0.034 mol
And 0.667 liters of CO2 or any other gas at STP would contain 0.034 moles.
If the gas was at some other temperature or pressure, assuming they were “moderate,” you could calculate the number of moles by solving the following formula for n.
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What type of chemical bond holds Ca²+ and O²- together in
CaO?
Answer:
ionic
Explanation:
Since Ca is a metal and O is a non-metal, the bond is ionic.
nuclear decay occurs according to first-order kinetics. a nuclide decays in 23.0 minutes from 12.9 g to 2.04 g. what is the rate constant for the nuclide?
The rate constant for the nuclide according to first-order kinetics is 0.0802 per minute.
Nuclear Decay in First-Order Kinetics:
m(t) = Me∧(-αt)
where m(t) = mass of nuclide after decay at time t;
M = mass of nuclide before decay;
α = rate constant of decay;
t = time for the decay.
What is first-order kinetics?When a fixed percentage of the drug is excreted per unit of time, this is known as first-order kinetics.
For example, The amount of drug in the body has a direct relationship to the rate of removal. The amount of medication eliminated per unit of time increases with concentration. The medication concentration decreases by 50% for each half-life.
Now,
m(t) = Me∧(-αt)
⇒e∧(αt) = [tex]\frac{m}{m(t)}[/tex]
applying ln on both sides;
αt = ln([tex]\frac{m}{m(t)}[/tex])
α = [tex]\frac{ln(m/m(t))}{t}[/tex]
here t= 23 minutes, M = 12.9 grams, m(t) = 2.04 grams;
dropping these values in the above equation we get,
α = [tex]\frac{ln(m/m(t))}{t}[/tex]
α = 0.0802 per minute;
The rate constant for the nuclide according to first-order kinetics is 0.0802 per minute.
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My hypothesis is that the higher the concentration of thiosulphate is the faster the reaction rate is. In the lab, I added HCL to the thiosulphate and recorded the time. Then I had to determine the concentration of thiosulphate and the reaction rate. What are two non-human sources of error?
To solve such this we must know the concept of chemical reaction. Therefore, the rate of reaction increases as the concentration of HCl increases.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
The rate of reaction depends on the number of collisions among the reactants and their orientation. As the number of concentration of reactants increases, the number of collisions increases and the rate of reaction also increases.
Therefore, the rate of reaction increases as the concentration of HCl increases.
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cr31 has pka 5 3.80. find the ph of 0.010 m cr(clo4)3. what fraction of chromium is in the form cr(h2o)w21(oh)21?
The fraction of chromium in cr(h2o)w21(oh)21 is 0.000185.
Regardless of how strong or weak an acid is, it dissociates into water in a similar way.
H+ A -> H A-.
Its dissociation constant value is influenced by the acid's Ka value, which is defined as the acid's dissociation constant. If Ka is higher, the acid is more acidic, and vice versa if pKa is higher, the acid is more acidic.
More pKa is equal to -log(Ka), so if Ka is 10 then pKa is -1, and if Ka is 1000 then pKa is -3, meaning that the less acidic the solution is, the more pKa there is.
Consider that I had an acid with a C initial concentration. If a certain amount of A dissociates upon equilibrium, I obtain the equilibrium concentration of the acid as C-A and the equilibrium concentration of both H and the conjugate (Ac-) as A. because their stoichiometric coefficients are nearly equal for both.
You can write the Ka expression as follows using this information.
Ka is equal to [H] [Ac-] / [HAc].
A * A / C-A results from substitution.
Fraction of chromium= Ph/Pk
=0.010/53.80=0.000185.
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The formula h20means
Answer:
water
Explanation:
Which observations demonstrate that cellular respiration is a chemical reaction?
Select all that apply.
The cellular respiration is a chemical reaction carbon dioxide is one of the product, however it is not a reactant. Therefore, Option A is correct.
What is cellular respiration ?Cellular respiration is the process by which biological fuels are oxidized in the presence of an inorganic electron acceptor such as oxygen to produce large amounts of energy, which is then used to drive ATP production.
Cellular respiration is the process by which oxygen and glucose are converted into water and carbon dioxide. Water and carbon dioxide are byproducts of the process, and ATP is the energy that is produced.
The chemical process by which organic compounds release energy is known as respiration. Exergonic reactions transform the compounds into new ones. Energy is released during the hydrolysis of adenosine triphosphate (ATP) to adenosine diphosphate (ADP) and phosphoric acid (Pi) (it is an exergonic reaction).
Thus, option A is correct.
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Other than color, what evidence can you use to identify chemical changes?
Explanation:
There are several pieces of evidence that can be used to identify chemical changes, other than a change in color. Some of these include the production of a gas, the formation of a precipitate, a change in temperature, and a change in the state of matter (e.g. from a solid to a liquid or vice versa). For example, if a solid substance is added to a liquid and bubbles of gas are produced, this is evidence of a chemical change. Similarly, if two clear solutions are mixed together and a solid precipitate forms, this is also evidence of a chemical change. Additionally, if a substance is heated and it changes from a solid to a liquid or from a liquid to a gas, this is also evidence of a chemical change.
what is the molecular formula for an unsubstituted alkane of smallest molar mass which possess a sterogenic center
C7H16, see as the compounds who shows optical isomerism have a chiral carbon so an unsymmetrical alkane can show the optical isomerism. 6 carbon and 8 carbon alkane is not the answer. So, the smallest alkane is 7 carbon alkane is 3 methyl hexane which have 3rd carbon as chiral carbon.
What is Molar mass?
Molar mass is the amount of mass that makes up one mole of a substance. It may also be referred to as the mass of the substance, measured in grammes, that makes up one mole of the substance. There are 6.023 x 1023 molecules in a mole. It is known as Avogadro's number. The most significant concept in physical chemistry is molar mass. The molar mass, the molar mass formula, the molecular mass and its formula, the distinction between the molar and molecular masses, and the relative molar mass and its formula are all topics covered in this article.
For elements or molecules, molar mass is displayed. The molar mass is simply the element's mass represented in atomic mass units in the case of single elements or individual atoms. In other words, an individual atom's atomic mass and molar mass are same.
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rank the following ionic compounds based on increasing lattice energy. mgo, cacl2, nacl, nabr
The increasing order of lattice energy for the given ionic compounds is NaBr <NaCl< CaCl₂ < MgO.
Ionic compounds refer to compounds comprising of ions that form charged particles when an atom (or group of atoms) gains or loses electrons. A cation is an ion charged positively; an anion is an ion charged negatively. Lattice energy refers to the energy required to convert one mole of an ionic solid into gaseous ionic constituents. Alternatively, it refers to the energy that must be supplied to one mole of an ionic crystal in order to separate it into gaseous ions in a vacuum via an endothermic process. Lattice energy is the energy gap between the energy of the separate gaseous ions and the energy of the ionic solid. Lattice energy increases with decrease in size and increase in charge. Hence, based on this the order of increasing lattice energy is NaBr, NaCl, CaCl₂, and MgO.
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Neon ga i found to effue through a hole. Careful meaurement indicate that 1. 42x10^-1 mol effued in 5. 8 minute. How long would it take for the ame amount of xenon ga to effue through the ame hole under the ame condition?
1.42 × [tex]10^{-1}[/tex] mol would take 14.79 min to effuse.
How long would it take to effuse?
Mathematically,
Rate of effusion = [tex]\sqrt{1/M}[/tex] ; M= Molar mass
For comparative study between two subjects, we can write:
[tex]r_{2} / r_{1}[/tex]= [tex]\sqrt{m1/m2}[/tex]
In this case, Ne be gas 1 and Xe be gas 2,
∴ r(Xe) = r(Ne)[tex]\sqrt{20.1797/131.293}[/tex]
r(Xe) = 9.60×10[tex]^{-3}[/tex]mol/min
Thus, for Xe 9.60×10[tex]^{-3}[/tex] mol effuses in 1 minute,
1.42 × [tex]10^{-1}[/tex] would effuse in 1.42 × [tex]10^{-1}[/tex] /9.60×10[tex]^{-3}[/tex] = 14.79 min
Thus, 1.42 × [tex]10^{-1}[/tex] mol would take 14.79 min to effuse.
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How do you know which atoms make up a molecule?
The number of atoms equals the number of moles, or N A. Being triatomic, CO 2 1 molecule of CO2 has 1 atom of C and 2 of the total number of atoms, which is 0. 5 3 6. 023 10 23 = 9. 0345 10 23 atoms. C has 0. 5. 1. 6. 023 10 23 = 3. 0115 10 23 atoms, according to the formula.
What kind of atoms are found in molecules?A molecule is created when two atoms are joined by a chemical bond. A diatomic molecule in this instance (prefix di- means two). The two main diatomic molecules in the air you are inhaling are nitrogen gas and oxygen gas. N2 and O2 are the formulas for them.
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PLEASE HELP 100 POINTS!!!! AND GIVING BRAINLIEST!!!!!!!!
Why should a movie producer consider filming a new version of The First Men in the Moon? Create a 6-8 slide multimedia presentation to market your idea for this movie to a production company. Rubric Criteria Points Possible 20 (10) 11-19 (6-9) 6-10 (3-5) 0-5 (0-2) Points Earned Ideas & Content Relates Theme of Novel Provides analysis of character Accurate diagram of plot 20 Establishes a theme, relates an analysis of the protagonist, effectively summarizes the plot, and maintains a clear focus throughout. Establishes a theme, identifies some character traits of the protagonist, provides a summary of the plot, and maintains focus throughout. There are a few lapses in focus, but the theme is fairly clear. Presents somewhat of an analysis of character. The plot summary is mostly correct. It is difficult to figure out the theme of the novel. The character analysis is poor or not present. The plot summary does not accurately represent the story. Organization Structure Precision Focus 20 Strong organization; seamless transitions between ideas; Effective and precise content. Organization is appropriate but conventional; Attempt at a focused and precise sales pitch. Attempts at organization, inappropriate use of lists or bullets; content is unfocused and ideas are not developed No clear organizational framework or transitions. Ideas are vague or unfocused Voice Personality Sense of audience 20 Strong awareness of audience in the design. Students can clearly explain why they felt the vocabulary, audio and graphics chosen fit the target audience. Some awareness of audience in the design. Students can partially explain why they felt the vocabulary, audio and graphics chosen fit the target audience. Some awareness of audience in the design. Students find it difficult to explain how the vocabulary, audio and graphics chosen fit the target audience. Limited awareness of the needs and interests of the target audience. Images and Music Relevance to theme Effectiveness Imagery 10 Images and music stir a rich emotional res
Answer:-Science have researched more facts and cool things about it-It would have more facts and things to learn-The quality would be better and more understandingI just tried 3 quick ideas I hope it can help a bit
Explanation:
Answer:
the answer is you should know this already :)))))))))))))))))))))))))))))))))))))))))))))))))))
Guyton de Morveau, a French chemist, created a system for naming compounds that is still used today. For example, he said that a compound of zinc and chorine is called zinc chloride. Which of the
following is true about de Morveau's naming system?
A. The non-metallic atom is last.
B. The metallic atom is last.
C. The larger atom is first.
D. The smaller atom is first.
In de Morceau's nomenclature scheme, the smaller atom appears first.
What naming scheme is used?Nomenclature is an organism name system used in biological classification. Genus and species names, two Latinized nouns drawn from numerous sources, serve as indicators of the species to which the creature belongs.
Who created the current nomenclature for chemical substances?On August 26, 1743, Antoine-Laurent Lavoisier was born in Paris, France. He was a well-known French chemist and a key player in the 18th century chemical revolution. In addition to co-creating the current system for identifying chemical compounds, he established an experiment-based explanation of the chemical reactivity of oxygen.
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the end point in a titration of a 25.00 ml sample of aqueous h2so4 was reached by addition of 33. 87 ml of 0.4500 m naoh. the balanced titration reaction is: 2 naoh h2so4 ---> na2so4 2 h2o what is the molarity of h2so4?
The end point in a titration of a 25.00 mL aq H₂SO₄ was reached by addition of 33. 87 ml of 0.4500 m NaOH. The molarity of H₂SO₄ is 0.3048 M.
The balanced chemical reaction is given as,
2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O
For exact neutralization of Va(mL) of an acid having Molarity Mₐ and basicity Nₐ by V(b) ml of a base having molarity M(b) and acidity N(b).
N(a) M(a) V(a) = N(b) M(b) V(b)
For H₂SOy basicity ,n(a) = 2
For NaOH acidity n(b) = 1
Va (H₂SO₄) = 25.00 mL
Vb (NaOH) = 37.87 mL
Mb (NaOH) = 0.4500M
Ma (H2S04) = ?
Substitute the values to get the value of Ma,
2 × Ma × 25 mL = 1 × 0.4500 M × 33.87 mL
⇒ Ma = (1 × 0.4500 M × 33.87 mL) ÷ 50
⇒ Ma = 0.3048 M
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The solubility of slaked lime, Ca(OH)2, in water is 0.185 g/100.0 mL. What volume of 1.60×10-3 M HCl is needed to neutralize 14.5 mL of a saturated Ca(OH)2 solution?
Answer: To determine the volume of 1.60 x 10^-3 M HCl that is needed to neutralize 14.5 mL of a saturated Ca(OH)2 solution, we can first calculate the number of moles of Ca(OH)2 that are present in the solution. We can do this by using the solubility of Ca(OH)2 in water (0.185 g/100.0 mL) and the volume of the solution (14.5 mL):
0.185 g Ca(OH)2 / 100.0 mL * 14.5 mL = 0.026975 g Ca(OH)2
Next, we can use the molar mass of Ca(OH)2 (74.1 g/mol) to convert the mass of Ca(OH)2 to moles:
0.026975 g Ca(OH)2 / 74.1 g/mol = 0.003634 mol Ca(OH)2
Since the reaction between HCl and Ca(OH)2 is a 1:1 mole ratio, we can then determine the number of moles of HCl that are needed to neutralize the Ca(OH)2 by dividing the number of moles of Ca(OH)2 by 1:
0.003634 mol Ca(OH)2 / 1 = 0.003634 mol HCl
Finally, we can use the concentration of the HCl solution (1.60 x 10^-3 M) and the number of moles of HCl that are needed to determine the volume of HCl that is required:
0.003634 mol HCl / (1.60 x 10^-3 M) = 0.0230 L HCl
Therefore, 0.0230 L (or 23.0 mL) of 1.60 x 10^-3 M HCl is needed to neutralize 14.5 mL of a saturated Ca(OH)2 solution.
a sample of ore containing manganese weighed 1.2354 grams. this sample was heated in a solution of nitric acid, which dissolved the manganese ion producing manganese(iii) nitrate (mn(no3)3). the acidity of the solution was adjusted, and hydrogen sulfide gas was bubbled into the solution producing 0.2876 grams of manganese(iii) sulfide (mn2s3). what is the percentage of manganese in the original sample?
The manganese content of the original sample is approximately 5.09%.
To determine the manganese content of the original sample, we need to know the atomic weight of manganese and the molecular weights of manganese(III) nitrate and manganese(III) sulfide.
Manganese has an atomic weight of 54.94 g/mol.
Manganese (III) nitrate has a molecular weight of 158.03 g/mol Manganese (III) sulfide has a molecular weight of 160.13 g/mol
The first step is to calculate the weight of manganese in manganese(III) nitrate.
0.2876 g manganese (III) sulfide ÷ 160.13 g/mol manganese (III) sulfide = 0.0018 g manganese
The manganese weight of the original sample can then be determined from the manganese weight of manganese(III) sulfide.
0.0018 g manganese ÷ 0.2876 g manganese (III) sulfide = 0.0626 g manganese per 1.2354 g sample
Finally, the weight of manganese in the sample can be used to calculate the percentage of manganese in the sample.
(0.0626 g manganese ÷ 1.2354 g sample) × 100% = 5.09% manganese
Therefore, the manganese content of the original sample is approximately 5.09%.
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Uppoe you have 100,000-atom ample of a radioactive nuclide that decay with a half life of 2. 0 day. How many radioactive atom are left after 10 day?
After 10 days, there will be approximately 15,625 radioactive atoms left.
What is radioactive?
The process through which an unstable nucleus loses energy through radiation is known as radioactive decay, also recognised as nuclear decay, radioactive contamination, radioactive disintegration, as well as nuclear disintegration. A substance that has unstable nuclei is regarded as radioactive. Alpha decay, beta decay, and gamma decay are three of the most frequent types of decay, and they all involve the emission of one or even more particles. Beta decay is a result of the weak force, while the nuclear force and electromagnetism are in charge of the other two mechanisms. Electron capture, which occurs when an unstable nucleus seizes an inner electron in one of the electron shells, is the fourth common type of decay.
This is because the half life of the nuclide is 2 days, meaning that after 2 days, half of the 100,000 atoms will have decayed and only 50,000 atoms will remain. After 10 days, the number will have halved 6 times, leaving 15,625 atoms (50,000/2^6).
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Ian has been learning about different kinds of mixtures at school. While he was helping prepare dinner for his family, he noticed that some of the food they were making were different kinds of mixtures. What kind of mixture was their dinner if they were having spaghetti and meatballs?.
The mixture of spaghetti and meatballs is heterogeneous.
What are the different types of mixtures?Heterogeneous and homogeneous mixtures are the two types of mixtures. While homogeneous mixtures seem consistent throughout, heterogeneous mixtures have clearly discernible components. A solution, which can be a solid, liquid, or gas, is the most typical kind of homogenous mixture.
What is a homogenous mixture?A mixture is said to be homogenous if its composition is constant throughout. Because the dissolved salt is evenly distributed throughout the whole saltwater sample, the salt water described above is homogenous.
Which five types of heterogeneous mixtures are there?There are five different types of heterogeneous mixtures: suspensions, colloids, liquids, gases, and solids.
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What are the values of ΔS for the water, the surroundings, and the universe for the evaporation of water from an open pan at 25°C?
positive, negative, positive
negative, negative, negative
positive, negative, zero
positive, negative, negative
The values of ΔS for water, the surroundings and the universe for the evaporation of water from an open pan at 25°C are positive, negative and positive respectively.
The process involves conversion of water in the liquid state to water in the gaseous state.
H₂O(l)→H₂O (g)
The entropy of a gas is more than that of the entropy of a liquid. Therefore ΔS of water is positive.
In this process, energy from the surroundings needs to be suppiled in order for the conversion of liquid to gas. So, entropy of surroundings decreases. i.e ΔS of surroundings is negative.
The process is spontaneous which means that it obeys the second law of thermodynamics i.e the increase in entropy of liquid water is larger than the decrease in entropy of the surroundings. Therefore, ΔS universe is positive.
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4. Lithium + tin(IV) sulfite ® lithium sulfite + tin-
2Li2S + Sn(SO4)2 → 2Li2(SO4) + SnS2 is Balanced chemical equation.
What is Balanced chemical equation?
A balanced chemical equation is a chemical reaction that has equal numbers of moles of chemical substances both in the reactant and the product side.
A chemical equation is said to be balanced if the quantity of each type of atom in the reaction is the same on both the reactant and product sides.
In a balanced chemical equation, the mass and the change are both equal.
From the missing image that is attached below, we can see that the picture depicts that we have:
The reactant side:
3 molecules of CH₄ and 3 molecules of N₂Cl₄
The product side:
3 molecules of CCl₄, 3 molecules of N₂ and 6 molecules of H₂
Therefore, the balanced chemical equation for the reaction is:
3CH₄ + 3 N₂Cl₄ → 3 CCl₄ + 3N₂ + 6H₂
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