C. NaOH
C. Cu (OH)
A. HCl
How many moles of electrons is required to deposit 5.6g of iron from a solution of iron (2) tetraoxosulphate(6)
Answer:
0.20 mol
Explanation:
Let's consider the reduction of iron from an aqueous solution of iron (II).
Fe²⁺ + 2 e⁻ ⇒ Fe
The molar mass of Fe is 55.85 g/mol. The moles corresponding to 5.6 g of Fe are:
5.6 g × 1 mol/55.85 g = 0.10 mol
2 moles of electrons are required to deposit 1 mole of Fe. The moles of electrons required to deposit 0.10 moles of Fe are
0.10 mol Fe × 2 mol e⁻/1 mol Fe = 0.20 mol e⁻
0.20 mol of electrons is required to deposit 5.6g of iron from a solution of iron (2) tetraoxosulphate(6)
The reduction of iron from an aqueous solution of iron (II).
[tex]Fe^{+2} +2e^{-} \rightarrow Fe[/tex]
The formula for number of moles is as follows:-
[tex]Number \ of \ moles=\frac{Mass}{Molar\ mass}[/tex]
The molar mass of Fe is 55.85 g/mol. The moles corresponding to 5.6 g of Fe are:
[tex]5.6 g \times\frac{1\ mol}{55.85\ g} = 0.10 \ mol[/tex]
2 moles of electrons are required to deposit 1 mole of Fe. The moles of electrons required to deposit 0.10 moles of Fe are:-
[tex]0.10 mol Fe\times\frac{2\ mol\ e^{-} }{1\ mol\ e^{-}} = 0.20 \ mol e^{-}[/tex]
Hence, 0.20 mol of electrons is required to deposit 5.6g of iron.
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Write the empirical formula for the hydrated KAl(SO4)2, based on your experimental results and answer to Question 2. Show all work including units.
Hint: if the ratio of moles of H2O to moles of anhydrous KAl(SO4)2 was 4, then the empirical formula would be: KAl(SO4)2•4H2O.
Answer to Question 2:
Ratio of 2:3
Answer:
Therefore mole ratio is [tex]H_{2}O[/tex] : [tex]KAl(SO_{4} )_{2}[/tex] is 12 :1
Empirical formula is [tex]KAl(SO_{4} )_{2}. 12 H_{2}O[/tex].
Explanation:
The chemical formula of a hydrate
Moles of anhydrous [tex]KAl(SO_{4} )_{2}[/tex]
Molar mass of [tex]KAl(SO_{4} )_{2}[/tex] = 258.21 g /mol
Mass of anhydrous [tex]KAl(SO_{4} )_{2}[/tex] = [mass of aluminum cup + alum after 2nd heating] –[ mass of empty cup]
= 3.5 g – 2.4 g
= 1.1 g
Moles of [tex]KAl(SO_{4} )_{2}[/tex]= mass / molar mass
= 1.1 g / 258.21 g per mol
= 0.00426 mol [tex]KAl(SO_{4} )_{2}[/tex]
The mole ratio of the H2O to [tex]KAl(SO_{4} )_{2}[/tex]
Mole ratio = moles of H2O/ moles of [tex]KAl(SO_{4} )_{2}[/tex]
= 0.05 mol H2O / 0.00462 mol [tex]KAl(SO_{4} )_{2}[/tex]
= 11.7
We can round the 11.7 to closest whole number = 12
Therefore mole ratio is [tex]H_{2}O[/tex] : [tex]KAl(SO_{4} )_{2}[/tex] is 12 :1
Empirical formula = [tex]KAl(SO_{4} )_{2}. 12 H_{2}O[/tex]
So we have 12 moles of water as the water of hydration in the empirical formula.
Alum hydrate is that the white crystalline solid after heating it'll start melting due to the water of hydration present in it then again solid will remain within the aluminum cup once all the water is given off within the sort of vapors.
b) if the scholar used 2.20 g of the sample but within the calculation, he started with 2.0 g sample then
when the mass of water is calculated using this data the mass of water is going to be higher therefore it gives more moles of water within the hydrate.
So the final answer is going to be artificially high.
Balance the following chemical equations.
Fe + H2S04 ------->Fe2(SO4)3 + H2
C2H6 + O2-------> H2O + CO2
KOH + H3PO4 ------->K3PO4 + H2O
SnO2 + H2-------> Sn + H2O
NH3 + O2 ------->NO + H2O
KNO3 + H2CO3-------> K2CO3 + HNO3
B2Br6 + HNO3 ------->B(NO3)3 + HBr
BF3 + Li2SO3 ------->B2(SO3)3 + LiF
9. (NH4)3PO4 + Pb(NO3)4-------> Pb3(PO4)4 + NH4NO3
SeCl6 + O2 ------->SeO2 + Cl2
Answer:
fe oo andffffe
aiejand iefjwe
eekkfwefwe f
opw fwfwfew
efefwefwefwi
Explanation:
Which of the following about a balanced chemical reactions is
NOT true?
O A properly written chemical equation will include the states of matter
for every substance in the reaction.
O The number of atoms of each element must be the same for both
reactants and products.
A balanced chemical equation must follow the Law of Conservation
of Matter
A balanced chemical equation must always include coefficients on
every reactant and product.
Answer:
A balanced chemical equation must always include coefficients on every reactant and product.
Explanation:
A balanced chemical equation does not need to include coefficients on every reactant and product.
For example, below is a balanced chemical equation in which the reactants and the products have no coefficients whatsoever:
NaOH(aq) + HCl (aq) -----> NaCl (s) + H2O (l)
Of course, a properly written chemical equation must include the states of matter of all the substances in the reaction and the number of atoms of each element must balance both in the reactant and product sides of the equation. Generally, a balanced chemical equation must obey the law of conservation of matter which opines that matter can neither be created nor destroyed but can only be converted from one form to another.
Hence, that a balanced chemical equation must always include coefficients on every reactant and product is not true.
If a quantity of this substance existed as a solid at a pressure of 0.75 atm and a temperature of 50°C, what phase
change(s) would occur if the temperature increased to 500°C?
a. Freezing and deposition
b. Melting and freezing
c. Condensation and sublimation
d. Melting and vaporization
Element 'X' forms a chloride with the formula XCl2, which is a solid with high melting point. X would most likely be in the same group of the periodic table as:
I) Si
2) Al
3) Mg
4) Na
pls pls answer fast
Answer:
Mg
Explanation:
Mg forms 2+ ions and mgcl2 has a melting point over 700°C I believe.
PLZ HELL ME WITH MY WORK
Answer:
Ba
Explanation:
How many Calcium (CA) atoms are in carbon tetrachloride
Answer:
5
Explanation:
Carbon tetrachloride has molecular formula as CCl4 , so from this it is evident that there are 4 atoms of Chlorine & 1 atom of carbon is present, in total 5 molecules are present in carbon tetra
Answer:
its 5
Explanation:
Cuál es tejidos conforman el sistema de tejido fundamental
Explanation:
Los tejidos que conforman el tejido fundamental son los siguientes:
-Parénquima
-Colénquima
-Esclerénquima.
El tejido fundamental constituye la parte principal del cuerpo de la planta porque intervienen en funciones tan importantes para el desarrollo y sostenimiento de la planta como el proceso de la fotosíntesis, el almacenamiento de agua y de nutrientes .
What volume of 0.200 M Na2CO3 (Mm = 106 g/mol) solution contains 53.0 g of Na2CO3?
Question 1 options:
0.200 L of solution
0.400 L of solution
0.500 L of solution
1.60 L of solution
2.50 L of solution
Answer:
volume in Liter = 2.50 L
Explanation:
Given:
Na2CO3 = 0.2 M
Molar mass of Na2CO3 = 106 g/mol
Mass of Na2CO3 solution = 53 gram
Find:
Volume of Na2CO3
Computation:
Number of mol of Na2CO3 = (53 g) / (1.06 x 10² g/mol)
Number of mol of Na2CO3 = 0.5 mol
M = Number of mol / volume in Liter
0.2 = 0.5/ volume in Liter
volume in Liter = 0.5 / 0.2
volume in Liter = 2.50 L
Nồng độ mol của 200ml dung dịch Nacl chứa 0,5 mol chất tan là :
Answer:
Explanation:
2,5M
Answer:
2,5m
Explanation:
c=n:v
. Why a chlorine atom with an atomic number of 17 will be negatively charged when its valance shell gains an electron.
Explanation:
When chlorine bonds and becomes stable, (had a full outer electron shell), because we know that chlorine has 7 electrons in it’s outer shell, it requires 1 to gain noble gas structure. So, when if bonds with an element and then becomes stable, the gaining of an electron means it becomes a negatively charged ion. (an ion being a charged particle.)
1.37 gram of cupric oxide on reduction with hydrogen gas gives 1.098gram of copper and in next experiment 1.17 gram of copper produce 1.476gram of copper oxide illustrate this satisfy law of definite proportion
Answer: This satisfies the law of definite proportion or constant proportion and it can be proven below.
Explanation:
The law of constant or definite proportion states that all pure samples of the same compound no matter how they are made; are made up of the same elements combined in the same proportion by mass. The can be verified by finding the ratio of copper to oxygen in the both experiment listed above.
In the first experiment:
1.37 g of cupric oxide contains 1.098 g copper therefore oxygen = 1.37 − 1.098
=0.272 g
The ratio of copper to oxygen is=
1.098 ÷ 0.272
= 4:1
In the SECOND or next experiment:
1.476 g of cupric oxide contains 1.17 g copper Therefore oxygen = 1.476−1.17
=0.306g
The ratio of copper to oxygen is =
=1.176 ÷ 0.306
=3.8:1
Which is approximately≃4:1.
In conclusion, despite the different methods of the experiments, composition of copper of copper in the two different samples are the same and the cupric oxide obtained from different sources contain the same elements ( copper and oxygen) combined in the SAME ratio.
1. Necesitas un "cubo concentrado" (de esos que se usan para sazonar las comidas Maggie, ricostilla) dos vasos de vidrio o plástico y agua (caliente y fría). 2.Agrega al vaso con agua fria la mitad de un cubo concentrado y déjala reposar unos minutos. Prepara el segundo vaso con agua caliente y agrégale la otra mitad del cubo. 3. Argumenta tus observaciones en relación con lo observado y con la teoria vista. ¿Como influye la temperatura en este experimento?
In the following acid-base reaction,
Cl- is the
HCI(g) + H2O(l) →H30+(aq) + Cl(aq)
acid
base
conjugate
base
Answer:
conjugate base
Explanation:
The following equation is given in this question:
HCI(g) + H2O(l) → H30+(aq) + Cl-(aq)
In accordance to Brønsted–Lowry acid–base theory, an acid is a substance that loses an hydrogen ion (H+) or proton in an aqueous solution. This theory further indicated that the substance formed after an acid loses its hydrogen ion is called a CONJUGATE BASE.
In the above equation, HCl is the acid because it loses H+ while the substance formed after the loss of H+, which is Cl- is a conjugate base.
can anyone help me in my chemistry homework?
Answer:
what is in your chemistry home work I can try for...
Answer:
1: A substance made by mixing other substances together.
2: Solutions, Suspensions, Colloids and Emulsion.
3: A particular kind of matter with uniform properties.
4: A homogenous mixture is that mixture in which the components mix with each other and its composition is uniform throughout the solution. A heterogenous mixture is that mixture in which the composition is not uniform throughout and different components are observed.
5: A solution is a homogeneous mixture of two or more components in which the particle size is smaller than 1 nm. Common examples of solutions are the sugar in water and salt in water solutions, soda water, etc. In a solution, all the components appear as a single phase.
6: A solution forms when one substance dissolves in another. The substance that dissolves is called the solute. The substance that dissolves it is called the solvent. For example, polar solvents dissolve polar solutes, and nonpolar solvents dissolve nonpolar solutes.
7: Common examples of suspension include the mixture of chalk and water, muddy water, the mixture of flour and water, a mixture of dust particles and air, fog, milk of magnesia, etc. Q2. Give the definition of suspension. Ans: A suspension is a heterogeneous mixture of two or more substances.
8: The Tyndall effect is light scattering by particles in a colloid or in a very fine suspension.
Explanation:
what mass of aluminium is produced from 100g of aluminium oxide?
Answer:
This answer is 108g mass of aluminum is produced from 100g of aluminum oxide
Cavendish’s name for hydrogen gas was "inflammable air." The word inflammable means "to burn." (Note that in is not a prefix in this word.) Why did Cavendish use this name?
Answer:
The gas formed in the experiment could catch fire easily. So, he named the gas inflammable air.
This was the answer straight from Plato. I hope that this helped you, please mark me the brainiest, like and rate my answer if it did! :)
Explanation:
This was the answer straight from Plato. I hope that this helped you, please mark me the brainiest, like and rate my answer if it did! :)
Answer:
The gas formed in the experiment could catch fire easily. So, he named the gas inflammable air.
Explanation: your welcome
The concentration of hydronium ions is greater than 1 × 10–7 for acidic solutions. True False
The concentration of hydronium ions (H₃O⁺) is generally greater than 1 × 10⁻⁷ for all acidic solutions: True.
What is an acidic solution?An acidic solution can be defined as a type of aqeous solution that has a high concentration of hydrogen ions (H⁺), which is typically greater than that of pure water.
As a result of the fact that an acidic solution has a power of hydrogen ions (pH) below 7, the concentration of hydronium ions (H₃O⁺) derived from the protonation of water would be greater than 1 × 10⁻⁷ for all acidic solutions.
In conclusion, we can deduce that a property of all acidic solution is a concentration of hydronium ions (H₃O⁺) that is greater than 1 × 10⁻⁷.
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Plz Help I have One more time To retake and I can't fail it..
Answer:
A
Explanation:
I think the answer would be A
plz answer (d) explain
Cu2+ is reduced to Cu.
Change in oxidation state is from +2 to 0
the setup below was used to investigate the reaction between metals and water
i.)identify solid X and state its purpose
ii.)write a chemical equation for the reaction that produces the flame
Answer:
I hope it helps you
Explanation:
make me brainlest
Solid X is glass wool and is used to generate the flow of steam .Chemical equation for reaction between metal and water is metal hydroxide and hydrogen gas.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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Jack was camping. He put a can of baked beans on his campfire, without opening the lid. The can exploded. What happened?
Answer:
Too much steam expands within the can, causing it to explode
Explanation:
Beans contain water, and when water is heated, steam is created. As the steam increases, there's less and less room for it to go. The built up pressure causes the can to explode.
is c10H8 a conductor
Answer:
No
Explanation:
Napthalene cannot conduct electricity
El tipo de enlace en los compuestos: NaF , SO2 e I2 ,son respectivamente de acuerdo a sus electronegatividades que son las siguientes: Na = 0.9 F= 4.0 S= 2.6 I =2.7 F=4.0
Respuesta:
NaF: Enlace iónico
SO₂: Enlace covalente polar
I₂: Enlace covalente apolar
Explicación:
El tipo de enlace entre 2 elementos depende de la diferencia de electronegatividad.
Si ΔEN = 0, el enlace es covalente apolar.Si 0 < ΔEN ≤ 1.7 , el enlace es covalente polar.Si ΔEN > 1.7 , el enlace es covalente iónico.NaF
ΔEN = |EN(Na)-EN(F)| = |0.9-4.0| = 3.1
El enlace es iónico.
SO₂
ΔEN = |EN(S)-EN(O)| = |2.6-3.5| = 0.9
El enlace es covalente polar.
I₂
ΔEN = |EN(I)-EN(I)| = |2.7-2.7| = 0
El enlace es covalente apolar.
Match the vocabulary words with their definitions.
1. an instrument to measure magnetism
megawatt
2. a system for the production of controlled nuclear energy
reactor
3. a million watts; thousand kilowatts
infrared
4. invisible radiation with waves longer than red
magnetometer
5. an engine in which a wheel turns by the force of wind, water, or steam
turbine
Answer:
1. magnetometer, 2. reactor, 3. megawatt, 4. infrared, 5. turbine.
Explanation:
A magnetometer is an electronic instrument used to measure magnetic fields.
(1. an instrument to measure magnetism - magnetometer)
A reactor is a device used for the production of controlled nuclear energy, there are two principles in which nuclear reactors can be based: (i) Fission, (ii) Fusion.
(2. a system for the production of controlled nuclear energy - reactor)
A million watts equals a megawatt, a power SI unit.
(3. a million watts; thousand kilowatts - megawatt)
Infrared radiation corresponds to electromagnetic waves whose wavelength is between 0.7 to 1000 micrometers.
(4. invisible radiation with waves longer than red - infrared)
A turbine is mechanical device which generates mechanical work at the expense of fluid energy.
(5. An engine in which a wheel turns by the force of wind, water or steam - turbine)
Describe how you would prepare a supersaturated solution
Answer:
A supersaturated solution contains more dissolved solute than required for preparing a saturated solution and can be prepared by heating a saturated solution, adding more solute, and then cooling it gently. Excess dissolved solute crystallizes by seeding supersaturated solution with a few crystals of the solute.
Explanation:
Cual es la longitud de onda de un foton emitido durante la transicion desde el stado n=5 al estado n=3 en atomo Hidrogeno? Dar como respuesta de la longitud de onda en nm (nanometros)
Answer:
1302 nm
Explanation:
Del formulario de Rydberg para longitud de onda
1 / λ = R (1 / nf ^ 2 - 1 / ni ^ 2)
1 / λ = 1.097 × 10 ^ 7 (1/3 ^ 2 - 1/5 ^ 2)
1 / λ = 1.097 × 10 ^ 7 (0.11 - 0.04)
1 / λ = 1.097 × 10 ^ 7 (0.07)
= 1,302 × 10 ^ -6 m
o 1302 nm
calculate the volume in L od 2.11mol/L CuSo4(aq) solution that contains 0.41 mol copper(2) sulfate
Answer:
0.194L
Explanation:
Molarity of a solution is its molar concentration, and can be calculated using the formula:
Molarity = no. of moles (n) ÷ volume (V)
According to this question, the molar concentration/molarity of a solution of copper sulfate (CuSO4) is 2.11mol/L and contains 0.41 mol CuSO4. The volume can be calculated as follows;
Volume = no. of moles ÷ molarity
Volume = 0.41mol ÷ 2.11mol/L
V = 0.194 liter
Calculate the mass percent of carbon,oxygen, nitrogen and hydrogen in acetamide, C2H5NO.
Molar Mass:
O=16, N=14,C=12, H =1.
Answer:
40.68 % C
23.73 % N
8.47% H
27.12% O
Explanation:
The mass percent of an element X in a compound is calculated as the molar mass (MM) of X multiplied by the number of atoms of X in the compound, divided into the molecular weight (MW) of the compound, as follows:
mass percent of X = (MM(X) x number of atoms of X)/MW compound x 100
Thus, we first calculate the MW of acetamide (C₂H₅NO) by using the molar mass of the chemical elements C, H, N and O:
MW(C₂H₅NO) = (12 g/mol C x 2) + (1 g/mol H x 5) + 14 g/mol N + 16 g/mol O = 59 g/mol
Now, we can calculate the mass percent of each element (C, H, N, O) in C₂H₅NO:
Mass percent of C (2 atoms of C in 1 molecule of C₂H₅NO):% mass C = (12 g/mol x 2)/(59 g/mol) x 100 = 40.68 %
Mass percent of N (1 atom of N in 1 molecule of C₂H₅NO):% mass N = (14 g/mol x 1)/(59 g/mol) x 100 = 23.73 %
Mass percent of H (5 atoms of H in 1 molecule of C₂H₅NO):
% mass H = (1 g/mol x 5)/(59 g/mol) x 100 = 8.47 %
Mass percent of O (1 atom of O in 1 molecule of C₂H₅NO):
% mass O = (16 g/mol x 1)/(59 g/mol) x 100 = 27.12 %
The sum of the mass percents has to be equal to 100%:
40.68 % C + 23.73 % N + 8.47% H + 27.12% O = 100%
