Answer:25 grams
Explanation:
when an element exists in nature by itself, it must have a charge of
An element existing in nature by itself, such as a neutral atom, will have an overall charge of zero due to the balanced number of protons and electrons.
Explanation:When an element exists in nature by itself, it is in the form of a neutral atom, which means it must have an overall charge of zero. This neutrality is achieved because the atom has an equal number of protons and electrons, and since protons and electrons carry equal but opposite charges, their charges cancel each other out. The proton carries a positive charge, and the electron carries a negative charge, both with a magnitude of 1.60×10-19 coulombs (C). Neutral atoms may form molecules by sharing electrons via covalent bonds but still retain no net charge unless they lose or gain electrons to become ions. Therefore, in its most stable form, an element on its own will exhibit a charge of zero.
If the pressure in the room is 759.2 torr and the vapor pressure of water is 23.8 torr, what is the pressure of hydrogen gas in the collection tube?
The partial pressure of Hydrogen gas can directly be calculated by simply taking the difference of the overall pressure and the vapour pressure of water. That is:
P (H2 gas) = 759.2 torr – 23.8 torr
P (H2 gas) = 735.4 torr
The reaction between aluminum and iron(iii) oxide can generate temperatures approaching 3000°c and is used in welding metals: 2al + fe2o3 â al2o3 +2fe in one process, 118 g of al are reacted with 601 g of fe2o3. calculate the mass (in grams) of al2o3 formed, and determine the amount of excess reagent left at the end of the reaction. mass of al2o3 formed:
The calculated mass of [tex]Al_2O_3[/tex] formed should be approximately 223.04 g.
Given reaction: [tex]2Al + Fe_2O_3[/tex] → [tex]Al_2O_3 + 2Fe[/tex]
Calculate the moles of Al and [tex]Fe_2O_3[/tex]:
Molar mass of Al = 26.98 g/mol
Molar mass of [tex]Fe_2O_3[/tex] = (55.85 g/mol * 2) + (16.00 g/mol * 3)
= 159.70 g/mol
Moles of Al = 118 g / 26.98 g/mol
≈ 4.37 moles
Moles of [tex]Fe_2O_3[/tex] = 601 g / 159.70 g/mol
≈ 3.76 moles
Determine the limiting reactant:
The balanced equation shows that 2 moles of Al react with 1 mole of [tex]Fe_2O_3[/tex]. So, for the given moles of [tex]Fe_2O_3[/tex], Al is the limiting reactant.
Calculate the moles of [tex]Al_2O_3[/tex] formed:
From the balanced equation, 2 moles of Al produce 1 mole of [tex]Al_2O_3[/tex].
Moles of [tex]Al_2O_3[/tex] formed = 4.37 moles Al / 2
≈ 2.19 moles
Calculate the mass of [tex]Al_2O_3[/tex] formed:
Molar mass of [tex]Al_2O_3[/tex] = (26.98 g/mol * 2) + (16.00 g/mol * 3)
= 101.96 g/mol
Mass of [tex]Al_2O_3[/tex] formed = 2.19 moles * 101.96 g/mol
≈ 223.04 g
Therefore, the calculated mass of [tex]Al_2O_3[/tex] formed should be approximately 223.04 g.
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To calculate the mass of Al2O3 formed and the amount of excess reagent left in the reaction between aluminum and iron(III) oxide, we need to perform stoichiometric calculations that involve converting grams to moles, identifying the limiting reagent, applying stoichiometric ratios to determine product amounts, and converting moles back to grams.
Explanation:To answer this question, we need to apply the concept of stoichiometry, which is a branch of chemistry that deals with the relative quantities of reactants and products in chemical reactions. As the balanced chemical equation for the reaction between aluminum and iron(III) oxide is given as 2Al + Fe2O3 → Al2O3 + 2Fe, this suggests that 2 moles of aluminum react with 1 mole of iron(III) oxide to produce 1 mole of aluminum oxide and 2 moles of iron.
To find the mass of Al2O3 formed, we would convert the given mass of Al and Fe2O3 to moles using their respective molar masses, see which reagent is the limiting reagent, and then use this information to determine the mass of Al2O3 formed in the reaction. The limiting reagent in a chemical reaction is the reactant that is completely consumed and determines the maximum amount of product that can be formed. Once the limiting reagent is consumed, the reaction stops, leaving the other reactant in excess.
By converting the remaining mass of the excess reagent left at the end of the reaction back to grams, we would calculate the mass of the excess reagent left. This involves a multi-step process encompassing the conversion of mass to moles, comparison of molar amounts, application of stoichiometry to find product amounts, and conversion of moles back to grams.
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What tool does the US government use to keep track of inflation throughout the years?
A. The Value Calculator
B. The Consumer Price Index
C. The Monetary Supply
D. The Inflation Scale
The chemical equation below shows the combustion of methane (CH4).
CH4 + 2O2 mc031-1.jpg CO2 + 2H2O
The molar mass of oxygen gas (O2) is 32.00 g/mol. The molar mass of carbon dioxide (CO2) is 44.01 g/mol. What mass of CO2, in grams, will form when 8.94 g O2 completely react?
3.25
6.15
13.0
53.0
Answer:
B
Explanation:
edg 2020
What is the most effective way to differentiate between potassium feldspar and plagioclase feldspar?
Calcium hydroxide reacts with carbon dioxide to form calcium carbonate (balanced equation given below). if you start with 155 ml of a 1.25 m solution of calcium hydroxide and add 10.0 g of carbon dioxide, how much calcium carbonate would be formed?
Nuclear power plants have the greatest environmental impact during __________. A) operation B) mining C) waste disposal D) construction E) none of the above
The enzyme α-amylase increases the rate at which starch is broken down into smaller oligosaccharides. it does this by
a. decreasing the equilibrium constant of the reaction.
b. increasing the change in free energy of the reaction.
c. decreasing the change in free energy of the reaction.
d. increasing the change in entropy of the reaction.
e. lowering the activation energy of the reaction.
The enzyme α-amylase increases the rate of starch breakdown by lowering the activation energy of the reaction, which is option (e). Enzymes act as catalysts in metabolic processes, and their activity can be influenced by environmental factors such as pH and temperature.
The enzyme α-amylase increases the rate at which starch is broken down into smaller oligosaccharides by lowering the activation energy of the reaction. This process does not require altering the equilibrium constant or the change in free energy; rather, it involves facilitating the reaction so that the energy barrier is lower, allowing the reactants to convert into products more easily. In the options provided, the correct answer to how α-amylase increases the rate of the reaction is (e) lowering the activation energy of the reaction.
An enzyme's role is to act as a catalyst, speeding up chemical reactions without being consumed or permanently changed by the reaction. Enzymes are crucial for metabolic processes, such as the hydrolysis of starch into sugars like glucose and maltose, which are used by cells as a source of energy and carbon. Parameters that can influence the activity of α-amylase include pH and temperature, which if not optimal, can reduce the rate of the reaction.
What is the purpose of DNA? A) manufactures proteins Eliminate B) reduces activation energy C) stores hereditary information D) to aid in facilitated diffusion
Identify the product of radioactive decay and classify the given nuclear reactions accordingly.
The product of radioactive decay :
₂He⁴ ₋₁e⁰γ ₁e⁰ Further explanationThe atomic nucleus can experience decay into 2 particles or more due to the instability of its atomic nucleus.
Usually radioactive elements have an unstable atomic nucleus.
The main particles are emitted by radioactive elements so that they generally decay are alpha (α), beta (β) and gamma (γ) particles
General formulas used in decay:
[tex] \large {\boxed {Nt = No. (\frac {1} {2}) ^ {\frac {T} {t1 / 2}}}} [/tex]
Information:
T = duration of decay
t1 / 2 = elemental half-life
N₀ = the number of initial radioactive atoms
Nt = the number of radioactive atoms left after decaying during T time
At the core, the reaction applies the law of eternity
• 1. energy
the energy before and after the reaction is the same
• 2. atomic number
the number of atomic numbers before and after the same
• 3. mass number
the number of mass numbers before and after the same
Particles that play a role in core reactions include
• alpha α particles ₂He⁴
atomic number decreases by 2, mass number decreases by 4
• beta β ₋₁e⁰ particles
atomic number remains the same , mass number decreases by -1
• gamma particles γ
Core reactions that occur usually release high energy
• positron particles ₁e⁰
atomic number remains the same , mass number decreases by +1
In general, the core reaction equation can be written:
X + a ---> Y + b + Q
X = target core
a = particle fired
Y = new core
b = the particle produced
Q = heat energy
or can be written simply
X (a, b) Y
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2NH4Cl(s)+Ba(OH)2⋅8H2O(s)→2NH3(aq)+BaCl2(aq)+10H2O(l) The ΔH for this reaction is 54.8 kJ . How much energy would be absorbed if 24.7 g of NH4Cl reacts?
What is the magnitude of the dipole moment formed by separating a proton and an electron by 85 pm ?
The dipole moment (p) resulting from the separation of a proton and an electron by 85 pm is approximately 3.7 Debye. This is calculated using the formula p = (+e) * (85 x 10^-12 m), where e is the elementary charge.
The magnitude of the dipole moment formed by separating a proton and an electron by 85 pm is indeed approximately 3.7 D (Debye).
Dipole moment formula: The dipole moment (p) of a molecule is calculated as the product of the charge (q) separated by the distance (D) between the charges. In this case, the charges are the electron (-e) and the proton (+e), and the distance is 85 pm (picometers).
Plugging in values: e = 1.602 x 10^-19 C, D = 85 x 10^-12 m, and the distance needs to be converted to meters: 85 pm = 85 x 10^-12 m.
Calculation: p = (+e) * (85 x 10^-12 m) = 1.602 x 10^-19 C * 85 x 10^-12 m ≈ 3.7 x 10^-30 C⋅m.
Converting to Debye: Since the Debye unit (D) is a convenient unit for dipole moments, we convert the result: 3.7 x 10^-30 C⋅m ≈ 3.7 D.
Therefore, the magnitude of the dipole moment in this case is approximately 3.7 Debye.
What volume of 18 m sulfuric acid must be used to prepare 1.80 l of 0.215 m h2so4?
To prepare 1.80 L of a 0.215 M H2SO4 solution, you will need to use 21.5 mL of 18 M sulfuric acid.
Explanation:To calculate the volume of 18 M sulfuric acid needed, we can use the formula:
M1V1 = M2V2
Where M1 is the initial molarity, V1 is the initial volume, M2 is the final molarity, and V2 is the final volume.
Plugging in the given values:
(0.215 M)(1.80 L) = (18 M)V2
Solving for V2:
V2 = (0.215 M)(1.80 L) / (18 M) = 0.0215 L = 21.5 mL
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To prepare 1.80 L of 0.215 M H2SO4, you would need to use 21.5 mL of 18 M sulfuric acid. This is calculated using the formula for dilution: C1V1 = C2V2.
Explanation:To answer this question, you need to use the formula for dilution of solutions: C1V1 = C2V2. Here, C1 is the initial concentration(18 M), V1 is the volume of this concentrated solution that we're trying to find, C2 is the final concentration(0.215 M), and V2 is the final volume(1.80 L).
When we plug these numbers into the formula, we get the equation 18 M × V1 = 0.215 M × 1.80 L. Solving for V1 gives us V1 = (0.215 M × 1.80 L) / (18 M) = 0.0215 L or 21.5 mL.
So, to prepare 1.80 L of 0.215 M H2SO4, you would need to use 21.5 mL of 18 M sulfuric acid solution.
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Which statements are true of all scientific endeavors? Check all that apply.
All scientific endeavors are time consuming.
All scientific endeavors are expensive.
All scientific endeavors are supported by evidence.
All scientific endeavors are a systemic process.
All scientific endeavors involve observation.
All scientific endeavors involve experimentation.
All scientific endeavors involve the collection of information.
Answer:
i think its C
Explanation:
Given that 0.403 g of nitrogen combines with 0.0864 g of hydrogen and H is assigned an atomic mass of 1.00 amu calculate the atomic mass of nitrogen based on the formula NH.
Given,
Mass of nitrogen = 0.403 g
Mass of hydrogen = 0.0864 g
Atomic mass of H = 1 amu
Moles = mass / molar mass
Molar mass of H₂ = 1 x 2 = 2 g/mol
Moles of hydrogen = 0.0864 g / 2 g/mol = 0.0432 moles
Nitrogen combines with hydrogen hence the chemical equation is:
N₂ + 3H₂ → 2NH₃
As per the balanced chemical reaction, 3 moles of H₂ combines with 1 mole of N₂
or, 1 mole of H₂ combines with 1/3rd mole of N₂
Therefore, 0.0432 moles of H₂ will combine with (1/3 x 0.0432 moles of N₂)
Moles of N₂ = 0.0144 mol
Molar mass = mass / moles
Molar mass of N₂ = (0.043 g N₂) / (0.0144 mol N₂) = 2.986 g/mol of N₂
Atomic mass of N = 2.986/2 = 1.493 amu
27 POINTS!!
Use the following table of a school bus during morning pickups to calculate its average speed between 0 h and 2.34 h.
please show work :)
16.34 km/2.34 h = 6.98 km/h
A chemist requires 0.811 mol Na2CO3 for a reaction. How many grams does this correspond to?
Which statement describes how NO2- reacts in this equilibrium H2SO3(aq) + NO2-(aq) HSO3-(aq) + HNO2(aq)
A deficiency of ADH in the body causes which disease
Give the conjugate acid for each compound below. co3^2-
Select which intermolecular forces of attraction are present between ch3ch2nh2 molecules.
The intermolecular forces present between [tex]{\text{C}}{{\text{H}}_3}{\text{C}}{{\text{H}}_2}{\text{N}}{{\text{H}}_2}[/tex] molecules are
[tex]\boxed{{\text{hydrogen bonding and dispersion forces}}}[/tex]
Further Explanation:
Intermolecular forces:
The forces that exist between the molecules are known as intermolecular forces (IMF). IMF includes both attractive as well as repulsive forces. They are electrostatic in nature and determine the bulk properties of the substances like melting and boiling points. Molecules are held in any substance due to these forces.
The various types of intermolecular forces are as follows:
1. Hydrogen bonding:
It is an attractive force that exists between hydrogen and more electronegative elements like N, O, F. It can either be intermolecular or intramolecular. Intermolecular hydrogen bonding is the one that occurs between different molecules. For example, the bond between HF and [tex]{{\text{H}}_{\text{2}}}{\text{O}}[/tex] is an intermolecular hydrogen bond. Intramolecular hydrogen bonding occurs between various parts of the same molecule. Ortho-nitro phenol and salicylaldehyde show this type of bonding.
2. Ion-dipole forces:
It is an attractive force that occurs between an ion and a molecule consisting of a dipole. The force between [tex]{\text{N}}{{\text{a}}^ + }[/tex] and water molecule is an example of this force.
3. Ion-induced dipole forces:
It is an attractive force that occurs between an ion and a nonpolar molecule. It induces a dipole in the molecule, resulting in ion-induced dipole force. The bond between [tex]{\text{F}}{{\text{e}}^{2 + }}[/tex] and oxygen molecule is an example of such kind of bond.
In [tex]{\mathbf{C}}{{\mathbf{H}}_{\mathbf{3}}}{\mathbf{C}}{{\mathbf{H}}_{\mathbf{2}}}{\mathbf{N}}{{\mathbf{H}}_{\mathbf{2}}}[/tex] , there is a presence of amine group [tex]\left({{\text{ - N}}{{\text{H}}_2}}\right)[/tex] having a highly electronegative N atom. So it can form hydrogen bonds with hydrogen atom of solvent molecule like water. Also, a hydrocarbon chain [tex]\left({{\text{ - C}}{{\text{H}}_3}{\text{C}}{{\text{H}}_2}}\right)[/tex] is present in the molecule and we know dispersion forces exist between atoms and molecules. So [tex]{\text{C}}{{\text{H}}_3}{\text{C}}{{\text{H}}_2}{\text{N}}{{\text{H}}_2}[/tex] has both dispersion forces as well as hydrogen bonds between its molecules.
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Answer details:
Grade: Senior School
Subject: Chemistry
Chapter: Ionic and covalent bonding
Keywords: Intermolecular forces, CH3CHNH2, hydrogen bonding, dispersion forces, -NH2, -CH3CH2, amine, hydrocarbon, atoms, molecules.
Which list of elements contains two metalloids?
write the balance equation for dehydration
of cyclohexanol
The balanced equation is written as;
C₆H₁₁OH (cyclohexanol) → C₆H₁₀(cyclohexene) + H₂O (water)
How to determine the equationThe balanced chemical equation for the dehydration of cyclohexanol C₆H₁₁OH to form cyclohexene (C6H10) is as follows:
C₆H₁₁OH (cyclohexanol) → C₆H₁₀(cyclohexene) + H₂O (water)
This equation represents the removal of a water molecule (H2O) from cyclohexanol to produce cyclohexene.
The process is typically carried out with the help of an acid catalyst, such as concentrated sulfuric acid (H₂SO₄).
The balanced equation shows that one molecule of cyclohexanol yields one molecule of cyclohexene and one molecule of water.
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The dehydration of cyclohexanol results in the formation of cyclohexene and water. This reaction is acid-catalyzed and proceeds through protonation, formation of a carbocation, and deprotonation steps. The balanced equation is C₆H₁₂O → C₆H₁₀ + H₂O.
Dehydration of Cyclohexanol
The process of dehydration involves the removal of water (H₂O) from a molecule. The dehydration of cyclohexanol (C₆H₁₂O) to form cyclohexene (C₆H₁₀) is an example of this type of reaction. This reaction is typically catalyzed by an acid such as phosphoric acid (H₃PO₄) or sulfuric acid (H₂SO₄).
Balanced Equation:C₆H₁₂O (cyclohexanol) → C₆H₁₀ (cyclohexene) + H₂O
The following is a step-by-step mechanism for the dehydration of cyclohexanol:Protonation: Cyclohexanol receives a proton (H⁺) from the acid catalyst, forming a protonated cyclohexanol.Formation of Carbocation: The protonated cyclohexanol loses a water molecule, forming a carbocation intermediate.Deprotonation: The carbocation loses a proton, resulting in the formation of cyclohexene.The final product, cyclohexene, is an alkene that results from the elimination of water from cyclohexanol.
23492u undergoes alpha decay. what is the atomic number of the resulting element.
what is stab pull?
A. color, denser crust sinks into mallet
B. folding and crumpling and sliding up word to create a mountain
C. when edges become denser and gravity pulls then down word and away from one another
D. currents just beneath the earths crust flow very slowly, causing moment of the plates move above them
Stab pull is the process by which the Earth's tectonic plates move apart at their edges due to the force of gravity at divergent plate boundaries. It leads to the formation of mountains and volcanic activity.
Explanation:Stab pull refers to the process by which the Earth's tectonic plates move apart at their edges due to the force of gravity. This occurs at divergent plate boundaries, where the edges of the leaves become denser and sink downwards and away from each other. As a result, new crust is created from magma upwelling beneath the leaves, leading to the formation of mountains and volcanic activity.
For example, the East African Rift System is a prime location for stab pull. The African Plate is splitting apart along this boundary, causing the formation of the Great Rift Valley and the creation of a new crust.
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mixtures cannot be separated by physical means how is a pure substance different from a mixture how is a pure substance different from a mixture the pure substance different from a mixture
Answer:
the mixture is made of one substance
Explanation:
I did the quiz
Alkenes: draw the product of 1-chloro-2-ethylcyclohexene with hydrogen gas and a platinum catalyst
A gas occupies 22.4 l at stp and 14.5 l at 100c and 2.00 atm pressure. how many moles of gas did the system gain or lose?
To find the number of moles of gas gained or lost, we can use the ideal gas law equation. By substituting the given values into the equation and simplifying, we find that the system gained or lost 0.921 moles of gas.
Explanation:To find the number of moles of gas gained or lost, we will use the ideal gas law equation:
P1V1 / T1 = P2V2 / T2
Using the given information:
P1 = 1 atm, V1 = 22.4 L (at STP), T1 = 273 K
P2 = 2.00 atm, V2 = 14.5 L, T2 = 100 °C = 373 K
Substituting the values into the equation:
(1 atm)(22.4 L) / (273 K) = (2.00 atm)(14.5 L) / (373 K)
Simplifying the equation:
Moles gained or lost = (1 atm)(22.4 L)(373 K) / (273 K)(2.00 atm)(14.5 L)
Calculating the result:
Moles gained or lost = 0.921 moles
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Which statement best reflects a change in weather
Today is cloudy, but tomorrow will be clear and sunny.
The average rainfall has decreased over the past five years.
Ocean temperatures are projected to increase over time.
Glaciers are melting more rapidly now than in the past 100 years.
The answer is A,Today is cloudy, but tomorrow will be clear and sunny.
Hope this helped :) have a nice day (: