Based on the standard heat of formation of aluminium oxide, the heat of the reaction of the decomposition of aluminium oxide is +3339.6 kJ
What is the heat of reaction?The heat or enthalpy of a reaction is the amount of heat evolved or absorbed when reactant molecules when reactants form products.
Considering the given reaction:
2 Al2O3(s) -> 2 Al(s) + 3 O2(g)The heat of formation of aluminum oxide is -1669.8 kJ/mol.
The heat of the reaction of the decomposition of aluminium oxide is calculated as follows:
Heat of reaction = Heat of formation of products - Heat of formation of reactants
Heat of reaction = {3 × ΔHf°O2 (g) + 2 × ΔHf° Al(s)} - 2 × ΔHf° Al2O3 (s)
Since the standard enthalpy of formation,ΔHf°, of an element in its most stable form is equal to zero.
ΔH°rxn = (3 × 0 + 2 × 0) - 2 × -1669.8 kJ/
ΔH°rxn = +3339.6 kJ
Therefore, the heat of the reaction of the decomposition of aluminium oxide is +3339.6 kJ
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Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the Periodic Table. Write the electronic configuration of these two elements. Which of these will be more electronegative? Why?
Answer:
Electronic configuration of nitrogen: K=2 L=5
Electronic configuration of phosphorus : K = 2 L = 8 M = 5
The element nitrogen will be more electronegative because of the smaller size of its atom. nitrogen accepts electrons more easily.
Explanation:
Explanation:
The atomic number of nitrogen is 7 , so its electronic configuration will be 2 , 5The atomic number of phosphorus is 15 , so its electronic configuration is 2 , 8, 5Nitrogen is more electronegative than phosphorus.
Reason :-
From top to bottom down a group, electronegativity decreases.
Explanation :-
Number of shell increases down a group, so there is an increased distance b/w the valence electrons and nucleus, or a greater atomic radius.
Since nitrogen has a smaller atomic radius than phosphorus, the attraction of its nucleus towards the incoming electron is more than phosphorus. So , because of smaller atomic size nitrogen accepts electrons more easily.
How many electrons does calcian have to gain or lose to have 8 valence electrons
Answer:
two electrons
Explanation:
Calcium atoms will lose two electrons in order to achieve the noble gas configuration of argon.
According to the kinetic theory of gases, an ideal gas molecule
Answer:
According to the kinetic theory of gases, in an ideal gas between two successive collisions, a gas molecule travels in a straight line.
According to the kinetic theory of gases, an ideal gas molecule move in a straight line between two successive collisions.
What is the kinetic theory of the gases?The kinetic theory of gases says that the gas is many large numbers of subatomic particles, which randomly motion always.
They move on a straight plane and only change their path when they collide with other molecules or the container's walls.
Thus, according to the kinetic theory of gases, an ideal gas molecule move in a straight line between two successive collisions.
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HELLO MAY I GET HELP AGAIN?
Answer:
( c ) sunlight.
Explanation:
the leaves are closer to the sunlight they require.
A glass container was initially charged with 1.95 moles of a gas sample at 3.75 atm and 21.7 °C. Some of the gas was released as the temperature was increased to 28.1 °C, so the final pressure in the container was reduced to 0.998 atm. What quantity in moles of the gas sample are present at the end?
Answer:
45830.4 moles
Explanation:
Ideal gas law is the hypothetical equation in which the pressure, volume, and temperature of the gas are directly related. It can be denoted as:
PV = nRT
The ideal gas law is:
PV = nRT
where,
P = Pressure
V = Volume
R = Gas constant
T =Temperature
n = moles
Given:
Moles in container = 1.95
Temperture = 294.85 K
Pressure = 3.75 atm
Volume =?
Substituting the values:
V = nRT/P
V = 1.95 × 0.082 × 294 / 3.75
Volume = 12.5 L
Now, the condition when changed, such that temperature is 301.25 K, pressure is 0.998 atm, and Volume is 12.5 L, then moles will be equal to:
PV/RT = n
0.998 × 12.5 / 0.082 × 301.25 = n
n = 45830.4 moles
Therefore, 0.521 moles is still present in the container.
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An atom moving at its root mean square velocity at 100. °c has a wavelength of. Which atom is it? assume that the atom is the most abundant isotope of an element.
The atom that moves at its rms velocity at 100°C with a wavelength of 2.31 * 10 m is : SULPHUR ( s )
Determine the molar mass of the atomTo determine the atom we will have to determine the molar mass of the atom
Applying De Broglie equation
λ = h / mv
Vrms = [tex]\sqrt{\frac{3RT}{M} }[/tex] ---- ( 1 )
Where : λ = 2.31 * 10⁻¹¹, R = 8.314 J / k.mol, T = 373 K, h = 6.626 * 10⁻³⁴ J.s
From equation ( 1 )
M = ( h² Ua ) / 3RT*λ² --- ( 2 )
where : Ua ( mass of an atom ) = 6.022 * 10²³, h = 6.626 * 10⁻³⁴, R = 8.314 J / k.mol, λ = 2.31 * 10⁻¹¹, T = 373 K
Insert values into equation ( 2 )
M ( molar mass ) = 32 g/mol
Sulphur has a molar mass of 32 g/mol therefore the atom is sulphur.
Hence we can conclude that The atom that moves at its rms velocity at 100°C with a wavelength of 2.31 * 10 m is : SULPHUR ( s ).
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The world is divided into large areas based on their average temperatures and precipitation. what are these areas called?
climate continents
climate zones
global areas
global regions
The world is divided into large areas based on their average temperatures and precipitation is called climate zones.
What is climatic zone?The principal zones that are demarcated by lines of latitude due to which the earth can be divided on the basis of climate. Tropical zone, Subtropics zone, Temperate zone and Cold zone are the four types of climatic zones.
So we can conclude that large areas based on their average temperatures and precipitation is called climate zones.
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The world is divided into large areas called climate zones based on their average temperatures and precipitation.
What are climate zones?Climate zones are areas of the Earth that results from differences in climate such as temperature, humidity, amount of precipitation etc.
Climate zones of the globe are as follows:
Temperate Arctic or polarSubtropical TropicalTherefore, it can be said that the world is divided into large areas called climate zones based on their average temperatures and precipitation.
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i don’t really know how to do this and need help
Answer:
3,550,000
Explanation:
3 significant figures is a number which has 3 figures
and zeros ( zero is not a figure )
Answer:
3550,000
Explanation:
Rounding rule:
If > 5 enter one
If < 5 rounding
Note:
< = less than
> = greater than.
Solve:
Base on the given:
it < 5 rounding
Thus,
3545,530 ≈ 3550,000
~Lenvy~
a system with 1 mole of an ideal gas changes its volume from 10 L to 1 L by isothermal compressoin. What is the change in entropy of the system
Answer:
ΔS=2.303 n Rlog(
V
1
V
2
)
=2.303×10×8.314log(
10
100
)=191.47 JK
−1
Thus ΔS=191.47JK
−1
Explanation:
Besides chlorine what are the chemical sanitizers approved for operations.
Iodine and quaternary ammonium are chemical sanitizers approved for operations.
What is a Sanitizer?These are chemicals which help to remove pathogens from the surface of materials.
Iodine and quaternary ammonium are able to do that in a safe manner. This is therefore the reason why both of them were approved as sanitizers and chosen as the most appropriate options.
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How does learning about elements,compounds and i turns allow us to understand the matter around us
Answer:
shows how anything like each thing is composed of for instance see how water is made of: hydrogen and oxygen which makes it a compound
The elements are the basic things by which everything in the world is build up. Different elements combine to form compounds. There are various kinds of inorganic and organic compounds around us that create the matter.
What are elements ?Elements are the basic things of any substance in the world. There are 118 known elements which can be found in the modern periodic table. These elements include metals, gases, and semi metals.
Atoms of same elements forms molecules. Atoms of different elements combines to form the compounds. There are various types of compounds such as ionic compounds, covalent compounds, coordination complex etc.
Water is a compound formed from the elements hydrogen and oxygen. The table salt we use every day is a compound, sodium chloride. Similarly we can find there are many compounds that we use everyday are creating the matter in the world.
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Hello people ~
Which of the following fibres is used for making parachutes?
A. Plastic
B. Terelyne
C. Nylon
D. Taylor swift
Answer:
C. Nylon
Explanation:
Nylon is a synthetic fiber, strong, elastic, and holds excellent abrasion resistance. Therefore it is used for making parachutes and ropes for rock climbing.
Answer:
Nylon
Explanation:
Nylon is a synthetic fibre not natural so long lastingIt is highly elastic and strong material.It is water proof also so used for making parachutesThe reaction between alcohols and carboxylic acids is called
Explanation:
When a carboxylic acid is treated with an alcohol and an acid catalyst, an ester is formed (along with water). This reaction is called the Fischer esterification.
The reaction between alcohols and carboxylic acids is called Fischer esterification.
What is Fischer esterification?Fischer Esterification is an organic reaction that produces an ester by converting carboxylic acids in the presence of excess alcohol and a strong acid catalyst.
This ester is created in the presence of water.
Thus, the reaction between alcohols and carboxylic acids is called Fischer esterification.
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What does the spheres represent?
Please help?
Answer:
the N at the top is north bottom is south w on your left is west and e of your right is east
Complete the mechanism for the reaction of butanone with NaBH4 followed by the addition of aqueous acid. Butanone is a 4 carbon chain where carbon 2 is double bonded to oxygen. This reacts with N a B H 4, followed by H 3 O plus to give the final product. Step 1: draw curved arrows. ⟶ Step 2: Draw the charged organic intermediate product. Include nonbonding electrons and charges. Omit the counterion. −→−−H3O+ Step 3: Draw the final product
The formation of a primary alcohol from a ketone involves the use of a ketone and NaBH4 followed by an acid workup.
Formation of a primary alcoholThe question is unclear but clearly relates to the formation of a primary alcohol. The first step in this reaction is the attack of the NaBH4 on the carbonyl carbon of butanone.
The reaction sequence is completed by an acid work up in which an acidic hydrogen is abstracted by the nucleophile to yield a primary alcohol.
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(1.) Once we confirm other planetary systems, what do you think the
next stage of exploration should be?
The next stage of exploration should be gathering information about the planetary system.
What is the next stage of exploration?Once we confirm other planetary systems, the next stage of exploration should be the use of instruments that helps us to collect information about that planetary objects so we can conclude that the next stage of exploration should be gathering information about the planetary system.
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What is the greatest degree of ionic character found in a sulfur bond
Answer:
Chlorine
Explanation:
Which element is likely to have a high thermal conductivity? antimony carbon chlorine sodium
The element which is likely to have a high thermal conductivity among given options is sodium.
What is thermal conductivity?Thermal conductivity of any substance is define as the capability of the substance to carry heat or transfer of heat.
As we know that metals are the good conductors of heat and non-metals are bad conductors, so we exclude carbon, antimony and chlorine atom from this group as they are non-metals. And sodium atom has the thermal capability.
Hence option (4) is correct.
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Answer: Option (4) is correct
Explanation:
Which of the following elements has the largest electronegativity?
Fluorine (F)
Bromine (Br)
Lithium (LI)
Calcium (Ca)
Answer:
FLUORINE
Explanation:
It has 5 electrons In Its 2P shell!
Answer:
Fluorine
Explanation:
because it has a score of 4.0 which is the highest possible
5.00 L of a gas is known to contain 0.965 mol. If the amount of gas is increased to 1.80 mol, what new volume will result ( at an unchanged temperature and pressure) ?
SHOW YOUR SOLUTION.
At an unchanged temperature and pressure, if the amount of gas increased by the given value, the final or new volume of the gas is 9.33L
Avogadro's lawAvogadro's law states that equal volumes of different gases contain an equal number of molecules provided temperature and pressure remains in the same conditions. It is expressed;
V₁/n₁ = V₂/n₂
Given the data in the question;
Initial volume; V₁ = 5.0L Initial amount of gas; n₁ = 0.965mol Final amount of gas; n₂ = 1.80mol Final volume; V₂ = ?To determine the new volume, we substitute our given values into the expression above.
V₁/n₁ = V₂/n₂
V₁n₂ = V₂n₁
V₂ = V₁n₂/n₁
[tex]V_2 = \frac{5.00L * 1.80mol}{0.965mol}\\\\V_2 = \frac{5.00L * 1.80}{0.965}\\\\V_2 = \frac{9L}{0.965} \\\\V_2 = 9.22L[/tex]
Therefore, at an unchanged temperature and pressure, if the amount of gas increased by the given value, the final or new volume of the gas is 9.33L
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Which is more active? a. Iron or copper? ___________________
Answer:
iron
Explanation:
has more magnetic metal
Between iron and copper metals, iron is more active than copper metal as it is present above Co in the electrochemical series.
What is electrochemical series?Electrochemical series is a type of reactivity series in which metals are arranged from bottom to the top in the increasing order of their reactivity.
As we know that reactivity is directly proportional to the activity of any element. In the electrochemical series iron is situated at the top position as compared to the copper metal.
So, iron is more active.
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Draw the structures, including stereochemistry, of the two intermediates and the final product. Use wedge‑and‑dash bonds and hydrogens on chirality centers
The structures of the two intermediates and the final product of the Grubbs catalysis reaction are shown in the attached image, with emphasis on the stereochemistry of the two intermediates and the end product.
What are intermediates?Intermediates are those species which are formed during the process of any chemical reaction which in turn finally converts into products.
Stereochemistry is a discipline of chemistry that studies the three-dimensional structure of molecules and how it influences their physical and chemical properties.
According to the question it is discussing about the Grubbs catalysis reaction which is a transition metal carbene series complex in which mixture of two optical active compounds are obtained which are the intermediates which finally gives product after reduction.
Hence the required structures are shown in the attached image.
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how many atoms of HCl are needed to produce 0.62 moles of hydrogen gas
Answer:
0.2 moles
Explanation:
The equation is given by;
2HCl => H² + Cl²
According to stoichiometry;
[tex] \frac{n \: hcl}{2} = \frac{n \: h {}^{2} }{1} [/tex]
[tex]nhcl = 2 \times nh {}^{2} [/tex]
To produce 0.62 moles of H² gas we need,
nHCL=2×0.62=1.24 moles
Using the relation;
number of moles:Number of atoms/Avogadro's constant
We can then say;
N(numb. of atoms)=n×Na
Number of atoms=1.24×6.02×10²³
Number of atoms=7.5852×10²³ atoms
What is the difference between solvation and dissociation
Answer:
The key difference between dissociation and solvation is that dissociation is the breakdown of a substance into the atoms or ions from which the substance is made of whereas solvation is the dissolution of a substance in a solvent due to the attraction forces between solvent molecules and the components.
Explanation:
Solvation refers to the process of surrounding solute particles with solvent molecules, leading to the formation of a solution. Dissociation specifically refers to the breaking apart of ionic compounds or molecules into their constituent ions when dissolved in a solvent.
Solvation occurs due to the attractive forces between the solute and solvent molecules, such as dipole-dipole interactions or hydrogen bonding. The result of solvation is the formation of a homogeneous solution where the solute particles are evenly distributed at the molecular level within the solvent.
Ionic compounds are composed of positively charged cations and negatively charged anions held together by electrostatic forces. When an ionic compound is dissolved in a solvent, such as water, the solvent molecules interact with the compound's ions, pulling them apart and surrounding them.
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Consider the combustion reaction for acetylene. 2c2h2(l) 5o2(g) right arrow. 4co2(g) 2h2o(g) if the acetylene tank contains 37.0 mol of c2h2 and the oxygen tank contains 81.0 mol of o2, what is the limiting reactant for this reaction? c2h2 o2 co2 h2o
The limiting reactant for the combustion reaction for acetylene is oxygen.
What is limiting reagent?Limiting reagents are those reagent which is present in less quantity as compared to the other reagent present for the formation of product.
Given chemical reaction is:
2C₂H₂(l) + 5O₂(g) → 4CO₂(g) + 2H₂O(g)
From the stoichiometry of the reaction, it is clear that:
2 moles of C₂H₂ = react with 5 moles of O₂
37 moles of C₂H₂ = react with 5/2×37=92.5 moles of O₂
And given moles of oxygen is 81 moles.
81 moles of O₂ = reacts with 2/5×81=32.4 moles of C₂H₂
And given moles of C₂H₂ = 81 moles.
Hence, O₂ is the limiting reagent.
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Answer:
O2 is the limiting reactant.
How does the buffer maintain the ph of the solution when an acid is added to it?.
Answer: By reacting with the hydrogen ions.
Explanation:
The molar mass of sucrose (C12H22O11) is 342. 3 g/mol. A chemist has a 0. 500-mol sample of sucrose. What is the mass, in grams, of this sample? 171 grams 342 grams 500 grams 684 grams.
Mass is the weight of the compound or the molecule in a sample that is given in grams. The mass of sucrose in the sample is 171 gms.
What is mass?The mass of the compound is the product of the molar mass of the compound and the number of moles of the compound in a sample.
Given,
The molar mass (m.w.t) of sucrose = 342.3 g/mol
Number of moles (n) of sucrose = 0.500 moles
The mass of sucrose is calculated as:
[tex]\begin{aligned} \rm mass &= \rm molar\; mass \times moles \\\\&= 342.3 \times 0.500\\\\&= 171.15 \;\rm gm\end{aligned}[/tex]
Therefore. the mass of sucrose in the sample is option A. 171 gms.
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Which of the following is pure compound?
Ethanol,petrol,steel ,tapwater
Answer:
tap water Is the pure substance
Answer:
Ethanol is pure
Explanation:
Purity meaning homogenious molecules/atoms, steel is a mix of iron and carbon, tapwater has minerals in it + fluoride etc, petrol has oxane and ethanol in it. ethanol is only ethanol and is inherently pure
Describe how electron arrangements are given using Lewis structures.
Answer:
The Lewis structure indicates that each Cl atom has three pairs of electrons that are not used in bonding (called lone pairs) and one shared pair of electrons (written between the atoms). A dash (or line) is sometimes used to indicate a shared pair of electrons: A single shared pair of electrons is called a single bond.
Explanation:
The single most important factor influencing potassium ion secretion is ________
The single most important factor influencing potassium ion secretion is its concentration in blood plasma.
What is Plasma?
This is the liquid portion of the blood and serves as the transport medium for nutrients in the body.
When there is a high concentration in the plasma, it maximizes the concentration gradient which favors its secretion into the urinary fluid.
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The single most important factor influencing potassium ion secretion is concentration.
What is Plasma?This is the liquid part of the blood present in the body and it transports nutrients throughout the body.
Whenever in the body there is high concentration of potassium ion as a result of which concentration gradient increases which in turn favors the secretion of potassium ion into the urinary fluid.
Hence concentration is the important factor.
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