[tex]\boxed{{\text{49}}{\text{.224 g}}}[/tex] of [tex]{\text{CC}}{{\text{l}}_4}[/tex] is produced by the reaction of 5.14 g of methane with an excess of chlorine.
Further explanation:
Stoichiometry of a reaction is used to determine the amount of species present in the reaction by the relationship between the reactants and products. It can be used to determine the moles of a chemical species when the moles of other chemical species present in the reaction is given.
Consider the general reaction,
[tex]{\text{A}} + 2{\text{B}}\to3{\text{C}}[/tex]
Here,
A and B are reactants.
C is the product.
One mole of A reacts with two moles of B to produce three moles of C. The stoichiometric ratio between A and B is 1:2, the stoichiometric ratio between A and C is 1:3 and the stoichiometric ratio between B and C is 2:3.
Limiting reagent:
A limiting reagent is the one that is completely consumed in a chemical reaction. The amount of product formed in any chemical reaction has to be in accordance with the limiting reagent of the reaction. The amount of product depends on the amount of limiting reagent since the product formation is not possible in the absence of it.
The given reaction occurs as follows:
[tex]{\text{C}}{{\text{H}}_4}\left(g\right) + 4{\text{C}}{{\text{l}}_2}\left(g\right)\to{\text{CC}}{{\text{l}}_4}\left(g\right)+4{\text{HCl}}\left(g\right)[/tex]
It is given that chlorine is present in an excess amount so methane [tex]\left({{\text{C}}{{\text{H}}_4}}\right)[/tex] is a limiting reagent and therefore it controls the amount of [tex]{\text{CC}}{{\text{l}}_4}[/tex] produced during the reaction.
The formula to calculate the amount of [tex]{\text{C}}{{\text{H}}_4}[/tex] is as follows:
[tex]{\text{Amount of C}}{{\text{H}}_4} = \frac{{{\text{Given mass of C}}{{\text{H}}_{\text{4}}}}}{{{\text{Molar mass of C}}{{\text{H}}_{\text{4}}}}}[/tex] …… (1)
The given mass of [tex]{\text{C}}{{\text{H}}_4}[/tex] is 5.14 g.
The molar mass of [tex]{\text{C}}{{\text{H}}_4}[/tex] is 16.04 g/mol.
Substitute these values in equation (1).
[tex]\begin{aligned}{\text{Amount of C}}{{\text{H}}_4} &= \left({{\text{5}}{\text{.14 g}}}\right)\left({\frac{{{\text{1 mol}}}}{{{\text{16}}{\text{.04 g}}}}}\right)\\ &= 0.32044\\&\approx{\mathbf{0}}{\mathbf{.320 mol}}\\\end{aligned}[/tex]
From the balanced chemical reaction, it is clear that 1 mole of [tex]{\text{C}}{{\text{H}}_4}[/tex] produces 1 mole of [tex]{\text{CC}}{{\text{l}}_4}[/tex] .
So the amount of [tex]{\text{CC}}{{\text{l}}_4}[/tex] is equal to that of [tex]{\text{C}}{{\text{H}}_4}[/tex] and thus the amount of [tex]{\text{CC}}{{\text{l}}_4}[/tex] is 0.320 mol.
The formula to calculate the mass of [tex]{\text{CC}}{{\text{l}}_4}[/tex] is as follows:
[tex]{\text{Mass of CC}}{{\text{l}}_4} = \left( {{\text{Moles of CC}}{{\text{l}}_4}}\right)\left({{\text{Molar mass of CC}}{{\text{l}}_4}}\right)[/tex]
…… (2)
The number of moles of [tex]{\text{CC}}{{\text{l}}_4}[/tex] is 0.320 mol.
The molar mass of [tex]{\text{CC}}{{\text{l}}_4}[/tex] is 153.82 g/mol.
Substitute these values in equation (2).
[tex]\begin{gathered}{\text{Mass of CC}}{{\text{l}}_4} = \left({{\text{0}}{\text{.320 mol}}}\right)\left({\frac{{{\text{153}}{\text{.82 g}}}}{{{\text{1 mol}}}}}\right)\\ = {\mathbf{49}}{\mathbf{.224 g}}\\\end{gathered}[/tex]
Therefore, the mass of [tex]{\text{CC}}{{\text{l}}_4}[/tex] produced is 49.224 g.
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Answer details:
Grade: Senior School
Subject: Chemistry
Chapter: Mole concept
Keywords: stoichiometry, reactant, product, limiting reagent, CCl4, CH4, Cl2, molar mass, given mass, amount of CH4, amount of CCl4, 49.224 g, mass of CCl4, 4Cl2, 4 HCl, 5.14 g, 16.04 g/mol.
Glucose is a simple sugar made up of carbon, hydrogen, and oxygen. What kind of molecule is
glucose?
A. Glucose is protein.
B. Glucose is a nucleic acid.
C. Glucose is an organic molecule.
D. Glucose is an inorganic molecule
Answer:
C
Explanation:
Edg
What is the formula for chlorine monoxide?
Final answer:
The formula for chlorine monoxide is Cl₂O, also known as dichlorine monoxide, which reacts with water to form hypochlorous acid.
Explanation:
The formula for chlorine monoxide is Cl₂O. This compound is also known as dichlorine monoxide. It is a yellowish-red gas and can be prepared through several reactions, including the reaction of chlorine gas with mercury oxide. Chlorine monoxide is notable for its role in the degradation of the ozone layer where, for example, it participates in the reaction cycle with ozone to form oxygen. In a reaction with water, it forms hypochlorous acid, illustrating its high water solubility and chemical reactivity.
A common product of acid-base neutralization reaction is
Final answer:
A common product of acid-base neutralization reaction is water and a salt.
Explanation:
A common product of acid-base neutralization reaction is water and a salt. In this reaction, an acid and a base react to form a salt and water. For example, when hydrochloric acid (HCl) reacts with sodium hydroxide (NaOH), the products are sodium chloride (NaCl) and water (H2O).
How much energy is required to raise the temperature of 3 g of silver from 15°C to 20°C?
The energy is required to raise the temperature of 3 g of silver from 15°C to 20°C is
Calculation:Specific heat capacity of silver (Csp) = 0.237 J/g°C
Given data,
Mass of silver in g (m) = 3g
Initial temperature (T1) = 15 °C
Final temperature (T2) = 20°C
Change in temperature (ΔT)= T2 - T1 = 20-15 = 5°C
Formula,
E = m×Csp×ΔT ...(I)
Put the value of all data in equation (i), we get
E = 3g × 0.237 J/g°C ×5°C
E = 3.555 J
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What is the missing part of the equation below?
²³⁸U₉₂→²³⁴Th₉₀ + ?
A. ⁴He₂
B. ⁴³⁸He₂
C. ⁴He₄
D. ²He₄
Answer:
A) ⁴He₂
Explanation:
²³⁸U₉₂ → ²³⁴Th₉₀ + A
To obtain the missing element (A), we have to first find it's atomic and mass numbers.
The mass number is the sum total of the protons and neutrons in an atom. It is usually equal to the superscript in an atom. for example in ²³⁸U₉₂ the mass number is 238.
The atomic number is the total of the protons in an atom. It is usually equal to the subscript in an atom. for example in ²³⁸U₉₂ the atomic number is 92.
In a chemical eqation, there's conservation of mass.
With this, mass number of products = mass number of reactants. same thing for the atomic number.
Mass number of Product = 238
Mass number of Reactant = 234 + x
238 = 234 + x
x = 238 - 234 = 4
Atomic number of product = 92
Atomic number of reactant = 90 + y
92 = 90 + y
y = 92 -90 = 2
So the atomic number of the missing element is 2 and its mass number is 4. ⁴A₂.
Among the elements, the only match is ⁴He₂. So the correct option is A
how much heat is released by 38 gram sample of water to freeze
When a 38 gram sample of water freezes it releases approximately 12.66 kJ of heat. This is because freezing is an exothermic process, meaning the substance releases energy in the form of heat.
Explanation:The process of freezing water is exothermic, meaning it releases heat. The amount of heat released when water freezes can be calculated using its enthalpy change upon freezing. For water, the enthalpy change upon freezing is approximately -6.0 kJ/mol. Here's how to calculate:
First, make sure that you have the appropriate conversion factors. Given that the molar mass of water is 18.015 g/mol, a 38 gram sample of water would be approximately 2.11 moles.Now use this information with the enthalpy change upon freezing (which is -6.0 kJ/mol) to calculate the amount of energy change (which will be measure in kJ). Multiply the number of moles by the enthalpy change: 2.11 moles * -6.0 kJ/mol = -12.66 kJ (negative because heat is being released). So, a 38 gram sample of water would release approximately 12.66 kJ of heat when it freezes.Learn more about Heat of freezing here:https://brainly.com/question/32765057
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When a 38 gram sample of water freezes it releases approximately 12.66 kJ of heat.
This is because freezing is an exothermic process, meaning the substance releases energy in the form of heat
To freeze a 38-gram sample of water, 12,692 joules of heat is released, calculated using the latent heat of fusion for water which is 334 J/g.To determine the amount of heat released when a 38-gram sample of water freezes, we must use the latent heat of fusion. The heat of fusion for water is 334 J/g. This value represents the amount of heat energy released or absorbed during the phase change of water from liquid to solid, and vice versa, without changing temperature.The formula to calculate the heat released is:
Heat released (Q) = mass (m) x heat of fusion (Lf)Given that: m = 38 grams and Lf = 334 J/g, we can plug in the values:
Q = 38 g x 334 J/g = 12,692 JTherefore, 12.66 kJ of heat is released when a 38-gram sample of water freezes.
Correct question is: How much heat is released by a 38-gram sample of water to freeze at its freezing point?
Do ionic or covalent substances tend to produce more ions in solution? ...?
the answer is A. ionic
Ionic compounds produce more ions in solution than covalent compounds, as they dissociate into their constituent ions, resulting in a greater number of dissolved particles compared to the individual molecules of covalent substances.
In solution, ionic compounds tend to produce more ions than covalent substances. When ionic compounds like sodium chloride (NaCl) dissolve in water, they separate into their constituent ions - for instance, NaCl yields one mole of Na+ ions and one mole of Cl⁻ ions, resulting in twice as many particles per mole as there were originally in the solid state.
On the other hand, covalent compounds typically dissolve in water as individual molecules without forming ions, such as glucose (C₆H₁₂O₆), which results in the same number of particles as moles dissolved.
For example, one mole of an ionic compound like NaCl will produce 2 moles of dissolved particles (ions), which is greater than the 1 mole of particles that results when one mole of a covalent compound, such as glucose, dissolves. This means that ionic substances affect the properties of solutions more significantly compared to an equivalent amount of dissolved covalent substances.
solute will continue to dissolve in a solvent until:
a) an equilibrium is reached
b) it is all dissolved
c) there is as much dissolved as there is not dissolved
Answer:
A) An equilibrium is reached
Explanation:
In chemistry class, you are given a density column with golden syrup, water, and oil. Your teacher gives you an unknown substance. The unknown substance is a solid, and it has been determined that the density of the unknown is 7.50 g/cm3. If this unknown solid was placed into the density tube, which of these best describe the outcome?
A) It would float on top of the oil.
B) It would sink directly to the bottom.
C) It would rest between the oil and the water.
D) It would float between the oil and the golden syrup.
Answer:
The correct answer is option B) It would sink directly to the bottom.
Explanation:
Hello!
Let's solve this!
Generally, solids have a higher density than liquids. In this case the densities are differentiated between the syrup, the oil and the water.
I think the solid would sink to the bottom.
After the explanation, we conclude that the correct answer is option B) It would sink directly to the bottom.
Elements consist of tiny particles called
Elements consist of tiny particles called atoms.
Atoms are the smallest units of an element that can participate in chemical reactions. They are incredibly tiny, with sizes on the order of 10^{-10} meters. Each element is made up of only one type of atom, and these atoms have a characteristic mass and chemical properties that are unique to that element.
Atoms themselves are composed of even smaller particles called subatomic particles. These include:
Protons: Positively charged particles located in the nucleus (center) of the atom.
Neutrons: Neutrally charged particles that are also found in the nucleus.
Electrons: Negatively charged particles that move around the nucleus in regions called electron clouds or shells.
While researchers have discovered that there are an excessive number of receptor sites for _________________, it is not the only neurotransmitter involved in schizophrenia.
Research indicates that schizophrenia is associated with an abundance of dopamine receptors, but glutamate and serotonin neurotransmitters are also involved, with implications for both symptom manifestation and treatment.
Explanation:While researchers have discovered that there are an excessive number of receptor sites for dopamine, it is indeed not the only neurotransmitter involved in schizophrenia. The dopamine hypothesis of schizophrenia proposes that an overabundance of dopamine or dopamine receptors is responsible for the onset and maintenance of the disorder. However, this view has evolved, and now it is understood that glutamate also plays a significant role, particularly in the non-competitive antagonism at NMDA receptors, which causes behavioral changes resembling schizophrenia in all three symptom domains - positive, negative, and cognitive. Additionally, serotonin levels may contribute to the disorder, with serotonergic drugs affecting symptomology and second-generation antipsychotics acting as 5HT-2 receptor antagonists. The complexity of neurotransmitter involvement indicates a more nuanced understanding of the etiology of schizophrenia, with the possibility that observed neurotransmitter differences could be a result of the disease, its treatment, or potentially causal to it.
You are presented with a white solid and told that due to careless labeling it is not clear if the substance is silver fluoride, calcium fluoride, or potassium bromide. When you transfer the solid to a beaker and add water, the solid dissolves to give a clear solution. Next a Na2SO4(aq) solution is added and a white precipitate forms. What is the identity of the unknown white solid?
What is the IUPAC name for the compound FeS?
Answer:
The correct answer is “Iron(II) sulfide.”
Explanation:
It is pretty obvious there is presented an iconic compound made by iron written as Fe and a sulfur, S that is a nonmental instead. A metal as iron will form a cation and a nonmetal an anion. The sulfur will need 2 electrons from iron in order to complete its octet and in this way the iron equilibrates the sulfur. It can give it 2, so that is why we write it in Roman numbers, and form the formula above.
Where does the term carbohydrate come from?
Multiple Choice 1. The equation 2NO2↔N2O4 shows a system (1 point) in chemical equilibrium. in physical equilibrium. that does not reach equilibrium. that does not change. 2. If an endothermic reaction is in equilibrium, what will happen when you increase the temperature? (1 point) More reactants form. More products form. No change in the amounts of products or reactants occurs. The system does not reach equilibrium again. 3. One way to determine the degree of saturation of a solid-liquid solution is to drop a crystal of the solute into the solution. If the crystal sits at the bottom of the container, the solution is (1 point) saturated. unsaturated. supersaturated. concentrated. 4. To calculate the molarity of a solution, you need to know the moles of solute and the (1 point) volume of the solvent. volume of the solution. mass of the solution. volume of the solute. 5. Which of the following foods would NOT taste acidic? (1 point) lime tomato orange celery 6. A base is defined as a compound that produces (1 point) hydroxide ions in solution. hydrogen ions in solution. hydronium ions in solution. sodium ions in solution. 7. The salt that is formed during the reaction between potassium hydroxide and hydrochloric acid is (1 point) NaCl. H2O. KCl. K2Cl. 8. An acid can be defined as (1 point) a proton acceptor. a proton donor. neither a proton donor nor a proton acceptor. both a proton donor and a proton acceptor. Fill in the Blank 9. A substance dissolves in water by breaking up into smaller pieces. These pieces of the same substance spread throughout the water. This process is known as ____________________. (1 point) 10. Stirring increases the rate of solution of a solid in a liquid because solute particles in solution are moved _____________ the surface of the solid. (1 point)
The questions cover various topics in chemistry including chemical equilibrium, reactions, acidity and basicity, solubility, and molarity. Among the key points are that the reaction 2NO2↔N2O4 forms a chemical equilibrium, an endothermic reaction in equilibrium produces more product when the temperature is increased, and a solution is saturated if a crystal of the solute sits at the bottom.
Explanation:1. The equation 2NO2↔N2O4 represents a chemical equilibrium.
2. If an endothermic reaction is in equilibrium, increasing the temperature will result in more products forming.
3. If a crystal of the solute sits at the bottom of the container, the solution is saturated.
4. To calculate the molarity of a solution, you need to know the moles of solute and the volume of the solution.
5. Out of the listed foods, celery would not taste acidic.
6. A base is defined as a compound that produces hydroxide ions in solution.
7. The salt formed during the reaction between potassium hydroxide and hydrochloric acid is KCl.
8. An acid can be defined as a proton donor.
9. A substance dissolves in water by breaking up into smaller pieces and spreading throughout the water. This process is known as solubility.
10. Stirring increases the rate of solution of a solid in a liquid because solute particles in solution are moved toward the surface of the solid.
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A car covers a distance of 112.6 km in 1.8 h. Calculate its speed in meters per second.
Answer: The speed of the car is 17.4 m/s
Explanation:
Speed is defined as the ratio of distance traveled to the time taken.
Mathematically,
[tex]\text{Speed}=\frac{\text{Distance traveled}}{\text{Time taken}}[/tex]
We are given:
Distance traveled = 112.6 km = 112600 m (Conversion used: 1 km = 1000 m)
Time taken = 1.8 hr = [tex]1.8\times 3600=6480s[/tex] (Conversion factor: 1 hr = 3600s)
Putting values in above equation, we get:
[tex]\text{Speed of car}=\frac{112600m}{6480s}=17.4m/s[/tex]
Hence, the speed of the car is 17.4 m/s
As longitudional waves travel, particles in the medium are pushed together and then pulled apart.we call this
In a chemical reaction, water decomposes to form hydrogen and oxygen. What is the correct term for the water?
A.
an element
B.
an atom
C.
a product
D.
a reactant
What is responsible for capillary action, a property of liquids?
a. surface tension
b. cohesive forces
c. adhesive forces
d. viscosity
e. two of these choices are correct.?
Answer:
e. two of these choices are correct (b) cohesive and c) adhesive)
Explanation:
Capillary action is essentially the rise of liquids through a narrow tube (region) called as a capillary. There are several forces that come into play in the context of capillary action.
If we consider a liquid like for example, water, then the cohesive forces are responsible for holding the water molecules together (intermolecular attractive force) while the adhesive forces acts between the water molecule and the walls of the capillary (force of attraction between unlike molecules). Surface tension can be defined as the energy required to increase the surface area of a liquid due to the cohesive forces. When adhesive forces become greater than the cohesive forces, the liquid tends to rise up a narrow tube . Thus, both adhesive and cohesive forces are responsible for capillary action.
Capillary action is caused by the combined effect of cohesive and adhesive forces, where the latter must be stronger than the former for the liquid to rise in the capillary tube. So the correct option is e.
Explanation:Capillary action is responsible for the movement of liquid within narrow spaces without the assistance of external forces, and it is a characteristic property of liquids. This phenomenon occurs due to both cohesive forces and adhesive forces. Cohesive forces are the intermolecular forces that hold a liquid together, whereas adhesive forces are the attractive forces between a liquid and the surface of the capillary. When a liquid is introduced to a capillary tube, these forces work against each other. If the adhesive forces between the liquid and the tube's material are stronger than the cohesive forces within the liquid, the liquid will rise in the tube. This is commonly observed with water in a glass capillary due to the strong adhesion between water molecules and the charged glass surface.
Therefore, the answer to the question, What is responsible for capillary action, a property of liquids? is e. Two of these choices are correct, as it is the combined effect of cohesive and adhesive forces that results in capillary action.
In an atom of barium, how many electrons have l = 0 and ml = 1.
Answer: 12 electrons
Explanation:
As the electrons move around the atom, they can move in any direction as long as they stay in their shell, and they are also constantly spinning. Shells or orbitals are specific distances from the nucleus and they are energy levels. Each of those shells has a name and there are a many ways that atomic shells are described.
First, the basic regions where electrons are found which is described using an "n" value, or the letters K, L, M, N, O, P, and Q. The "K" shell is the one closest to the nucleus, and "Q" is the farthest away. The second description looks at how electrons act inside of the shells, described with the "l" value which indicates in which suborbital an electron is found in (s, p, d, f, g, and h)
Quantum numbers are numbers associated with physical quantities conserved in certain quantum systems.
The main quantum number n This quantum number is related to both energy and the average distance between the nucleus and the electron. The values of this number, which corresponds to the number of the energy level, vary theoretically between 1 and infinity, but only atoms are known that have up to 8 energy levels in their fundamental state since the atomic number and the main quantum number are related by 2n2 = Z < 110.The secondary quantum number is L (l = 0,1,2,3,4,5,...,n-1), it indicates the shape of the orbitals and the sublevel of energy in which the electron is found. l = 0: Suborbit "s" (circular shape), it has a space for two electrons. l = 1: Suborbit "p" (flattened semicircular shape), it has three spaces for six electrons. l = 2: Sub-orbit "d" (lobular shape, with a nodal ring), it has five spaces for ten electrons. l = 3: Sub-orbit "f" (lobular with radial nodes), it has seven spaces for fourteen electrons. l = 4: Sub-orbit "g" (*), l = 5: Sub-orbit "h"The magnetic quantum number (m, ml), indicates the spatial orientation of the energy sublevel, "(m = -l,...,0,...,l)". For each value of l there are 2l+1 values of m.The spin quantum number (s, ms), Describes the intrinsic angular momentum of the electron. This angular momentum was originally interpreted in a classical way as the "self-rotation" of the electron on itself, and it was considered that given an axis the electron could do in two directions, opposite to each other. Therefore, the values that the spin quantum number can take are -1/2 and +1/2. In other words, each electron, in an orbit, spins on itself.So, L refers to the s subshell, so L=0 is related with the S-subshell. Ba is an atom found in the 6th shell, and it has the electronic configuration of [Xe]6s2 (1s2s2p3s3p4s3d4p5s4d5p6s), so there would be .12 electrons there because there are 6 s-orbitals with 2 electrons each. On the other hand, ml values rage from -L to L, and since the L value from this question is 0, there are no electrons that have both values of L=0 and ml=1. Since only one orbital of each type can have this magnetic quantum number and each orbital can host 2 electrons, we also have 12 electrons fitting this description.
Which of the following ions would represent the ion of an element from group 2A
the density of tungsten is 1210 lb ft3 what would be its specific volume. wanted all working :(
Answer: Specific volume of Tungsten is [tex]\frac{8.26*10^-^4ft^3}{lb}[/tex] .
Explanation: The density of Tungsten is given as 1210 lb per cubic feet and it asks to calculate its specific volume.
Density is directly proportional to the mass and inversely proportional to the volume where as specific volume is directly proportional to the volume and inversely proportional to the mass. It means, specific volume is the reciprocal of density.
specific volume = [tex]\frac{1}{density}[/tex]
Let's plug in the given value of the density in above formula:
specific volume = [tex]\frac{1}{1210lb*ft^-^3}[/tex]
specific volume = [tex]\frac{0.000826ft^3}{lb}[/tex]
If we want to write the answer in scientific notations then need to move the decimal four places to the left and so it becomes [tex]\frac{8.26*10^-^4ft^3}{lb}[/tex]
Why does iron not fit the pattern in column 7
Iron occurs 8 valence electron and column 7 elements have 7 valence electrons that's why iron will not be kept in column 7.
What is column?
The periodic table groupings are seen as vertical columns with numbers ranging from 1 through 18.
What is valence electrons?The count of electrons occupy in outermost orbital of the particular atom, can be introduced as valence electrons.
Such kind of elements which posses 7 valence electrons , will be placed in column 7. Iron has 8 valence electron but column 7 elements have 8 valence electron that's why iron will not be kept in column 7.
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17. When does radioactive decay occur?
A. when an atom gains electrons
B. when neutrons accumulate in the nucleus
C. when the nucleus decays
D. when an atom loses electrons
18. Why does radioactive decay occur?
A. Nuclear forces disintegrate protons.
B. The electric force and nuclear forces are in opposition to each other.
C. The electric force causes electrons to be released.
The correct options are as follows:
17. C.
Radioactive decay refers to the process by which an unstable atomic nucleus loses energy by giving out radiations. The radiations emit can be in form of alpha or beta particles or gamma rays. Radioactive decay is a random process, that is, one can not predict when it would happen. Radioactive decay occurs when the nucleus of an atom decay and no longer have enough binding energy to hold the atomic sub particles together.
18. B.
Radioactive decay occurs when the nucleus no longer have enough energy to hold the sub particles in the nucleus together. This situation always occur when there are excess protons or neutrons in the nucleus of the atom. In the nucleus of an atom, two forces are usually at work, nuclear and electrostatic forces. While proton experience both of these forces, neutron only experience the nuclear force. These two forces that are in opposition bring about radioactive decay.
Radioactive decay occurs when the nucleus of an atom decays. The correct answer is
C: when the nucleus decays.Radioactive decay occurs due to the electric force and nuclear forces being in opposition to each other.
B: The electric force and nuclear forces are in opposition to each other. What is Radioactive decayRadioactive decay involves the spontaneous transformation of unstable atomic nuclei into more stable configurations, resulting in the emission of particles or electromagnetic radiation.
Reasons
In an atomic nucleus, protons are positively charged particles, and they experience repulsive electric forces due to their like charges. However, nuclear forces, specifically the strong nuclear force, help hold the protons and neutrons together in the nucleus. When the balance between these forces is disrupted, such as when the nucleus becomes unstable, radioactive decay can occur as the nucleus seeks a more stable configuration.
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How many orbitals does the n=4 shell have ?
How many orbitals does the n = 4 shell have?
Answer is 16
how many grams of K2SO4 molar mass=174 g/mol would be needed to prepare 4.00 L of a 0.0510 M solution? ...?
What is the element above the element in Group 3, Period 4?
Fe2O3 + 2Al -> Al2O3 + 2Fe
Calculate the mass of iron metal (in grams) that can be prepared from 150 grams of aluminum and 250 grams of iron(III) oxide.
Help please!
Answer : The mass of iron metal needed are, 87.4 grams
Solution : Given,
Mass of Al = 150 g
Mass of [tex]Fe_2O_3[/tex] = 250 g
Molar mass of Al = 27 g/mole
Molar mass of [tex]Fe_2O_3[/tex] = 160 g/mole
Molar mass of Fe = 56 g/mole
First we have to calculate the moles of Al and [tex]Fe_2O_3[/tex].
[tex]\text{ Moles of }Al=\frac{\text{ Mass of }Al}{\text{ Molar mass of }Al}=\frac{150g}{27g/mole}=5.55moles[/tex]
[tex]\text{ Moles of }Fe_2O_3=\frac{\text{ Mass of }Fe_2O_3}{\text{ Molar mass of }Fe_2O_3}=\frac{250g}{160g/mole}=1.56moles[/tex]
Now we have to calculate the limiting and excess reagent.
The balanced chemical reaction is,
[tex]Fe_2O_3+2Al\rightarrow Al_2O_3+2Fe[/tex]
From the balanced reaction we conclude that
As, 2 mole of [tex]Al[/tex] react with 1 mole of [tex]Fe_2O_3[/tex]
So, 1.56 moles of [tex]Al[/tex] react with [tex]\frac{1.56}{2}=0.78[/tex] moles of [tex]Fe_2O_3[/tex]
From this we conclude that, [tex]Fe_2O_3[/tex] is an excess reagent because the given moles are greater than the required moles and [tex]Al[/tex] is a limiting reagent and it limits the formation of product.
Now we have to calculate the moles of [tex]Fe[/tex]
From the reaction, we conclude that
As, 2 mole of [tex]Al[/tex] react to give 2 mole of [tex]Fe[/tex]
So, 1.56 mole of [tex]Al[/tex] react to give 1.56 mole of [tex]Fe[/tex]
Now we have to calculate the mass of [tex]Fe[/tex]
[tex]\text{ Mass of }Fe=\text{ Moles of }Fe\times \text{ Molar mass of }Fe[/tex]
[tex]\text{ Mass of }Fe=(1.56moles)\times (56g/mole)=87.4g[/tex]
Thus, the mass of iron metal needed are, 87.4 grams
Measurements show that enthalpy of a mixture of gaseous reactants decreases by 228. kJ during a certain chemical reaction, which is carried out at a constant pressure. Furthermore, by carefully monitoring the volume change it is determined that -55kJ of work is done on the mixture during the reaction.
Calculate the change in energy of the gas mixture during the reaction.
Is the reaction exothermic or endothermic?
Answer:
-283 KJ, exothermic
Explanation:
We are given that
Enthalpy of a mixture of a gases reactants
Change in enthalpy=[tex]\Delat H[/tex]=-228 KJ
Where negative sign represents the enthalpy decreases.
Pressure=Constant.
Work don=w=-55 KJ
We have to calculate the change in energy of the gas mixture during the reaction.
At constant pressure, the change in enthalpy
[tex]\Delta H=\Delta U+P\Delta V[/tex]
Where w=[tex]-P\Delta V[/tex]
Where P=Constant
[tex]\Delta V=[/tex] Change in volume
[tex]\Delta U=[/tex] Change in energy
[tex]\Delta U=\Delta H-P\Delta V[/tex]
[tex]\Delta U=\Delta H+w[/tex]
Substitute the values then we get
[tex]\Delta U=-228-55=-283[/tex] KJ
Hence, the change in energy of the gas mixture during the reaction=-283 KJ
Change in enthalpy is negative it means the reaction is exothermic because the energy is evolved.
The reaction is exothermic, heat is evolved.
From the first law of thermodynamics we know that energy is neither created nor destroyed.
Therefore, the change in energy is obtained from the formula;
ΔU = ΔH + w
ΔU = change in energy
ΔH = Change in enthalpy (heat absorbed or evolved)
w = work done
ΔU = ?
w = -55kJ
ΔH = -228. kJ
ΔU= -228. kJ + ( -55kJ)
ΔU = -283 kJ
Learn more: https://brainly.com/question/4147359
What is the main difference between a homogeneous mixture and a heterogeneous mixture?
A.
The number of ingredients in each will differ.
B.
The components of a homogeneous mixture are evenly distributed.
C.
A homogeneous mixture is easier to make.
D.
The components of a heterogeneous mixture are spaced evenly throughout.
Final answer:
The main difference between a homogeneous mixture and a heterogeneous mixture is that the components of a homogeneous mixture are evenly distributed throughout, making any sample taken from the mixture have the same composition. Conversely, a heterogeneous mixture does not have a uniform composition, and its different components can usually be seen and separated physically.
Explanation:
The main difference between a homogeneous mixture and a heterogeneous mixture is how the components are distributed within the mixture. A homogeneous mixture has its components evenly distributed throughout, meaning any sample taken from the mixture will have the same composition. In contrast, a heterogeneous mixture does not have a uniform composition, and the different components can usually be seen and separated physically. An example of a homogeneous mixture could be a solution of sugar dissolved in water, where the sugar and water are so thoroughly mixed that the composition is the same throughout the solution. On the other hand, a mixture of sand and water serves as an example of a heterogeneous mixture because the sand and water do not uniformly mix, allowing the components to be seen and separated easily.