Answer:
it's the first two
Explanation:
A compound ‘X’ is used for drinking, has pH =7.Its acidified solution undergoes decomposition in presence of electricity to produce gases ‘Y’ and ‘Z’ The volume of Y is double than Z. Y is highly combustible whereas Z is supporter of combustion. Identify X, Y & Z and write the chemical reactions involved.
Answer:
X = Water (H2O) ; Y = Hydrogen ; Z = Oxygen
Explanation:
2(H2O) -------> 2H2 + O2
2.70g of Zn (s) reacts with 50.0 mL of 1.00 M HCl solution to produce hydrogen gas according to the reaction. (R = 0.08206 L·atm·K-1·mol-1) Zn(s) + 2HCl (aq) = ZnCl2 (aq) + H2(g) a) calculate mole of Zn used in this reaction b) calculate mole of HCl used in this reaction c) calculate which reactant is a limiting reactant d) calculate mole of hydrogen gas formed e) calculate volume of H2 gas at STP in Liters that will be produced during the reaction
Answer:
a. 0.0413 moles Zn
b. 0.0500 moles HCl
c. HCl is the limiting reactant
d. 0.0250 moles H₂
e. V = 0.56L
Explanation:
The reaction of Zn(s) with HCl is:
Zn(s) + 2HCl (aq) → ZnCl₂ (aq) + H₂(g)
Where 1 mole of Zn reacts with 2 moles of HCl.
a) To convert mass in grams to moles of a substance you need to use molar mass (Molar mass Zn: 65.38g/mol), thus:
2.70g Zn × (1mol / 65.38g) = 0.0413moles of Zn
b. Now, when you have a solution in molarity (Moles / L), you can know the moles of a volume of solution, thus:
Moles HCl:
50.0mL = 0.0500L × (1.00mol / L) = 0.0500 moles HCl
c. The limiting reactant is founded by using the chemical reaction as follows:
For a complete reaction of 0.0500 moles HCl you need:
0.0500 moles HCl × (1 mole Zn / 2 moles HCl) = 0.0250 moles Zn
As you have 0.0413 moles of Zn, and you need just 0.0250 moles for the complete reaction, Zn is the exces reactant and HCl is the limiting reactant
d.As HCl is limiting reactant and 2 moles of HCl react with 1 mole of H₂, moles of hydrogen formed are:
0.0500 moles HCl × (1 mole H₂ / 2 moles HCl) = 0.0250 moles H₂
e. Using PV = nRT, you can find volume of gas, thus:
PV = nRT
V = nRT / P
Where P is pressure 1atm at STP, n are moles, R is gas consant 0.08206Latm/molK and T is absolute temperature 273.15K at STP.
V = 0.0250molesₓ0.082atmL/molKₓ273.15K / 1atm
V = 0.56L
What is the acceleration of the object’s motion? 0.5 m/s2 -0.5 m/s2 2 m/s2 -2 m/s2
Answer: -2m/s2
Explanation:
Using the following equation ; acceleration = Change in velocity / time
i.e a = v - u / t
where 'a' = acceleration
v = final velocity
u = initial velocity
t = time
Therefore; from the graph we have acceleration to be, 0 - 6m/s / 3s = -2m/s2
Select the correct answer.
A sample of gas at 300 K has a volume of 2.0 liters. At what temperature will the volume decrease to 1.0 liter if the pressure is kept constant
A 600K
B 150K
C 250K
D 650K
150 k is the correct answer
Answer:
classify each as Convection, Conduction or Radiation
1. A hot air balloon rises, then falls.
2. A metal spoon gets hot when you leave it in a hot coffee.
3. You leave a poker in the fire and the handle starts to turn red with heat.
4. Bubbles moving in a lava lamp.
5. You put your hand near an incandescent light bulb and you can feel the heat.
6. The air inside an oven circulates to bake a cake.
7. The sunlight warms your face.
8. The air above a campfire swirls with smoke and sparks.
9. Ice melts in hot water.
10. The transmission of electromagnetic waves in a microwave oven.
Explanation:
Paul and Peter are weight lifters, Paul lifts 100kg barbell over his head 10 times in 1 minutes. Peter lifts 100kg barbell over his head 10 times in 10 seconds. Who has more power? Give your reasons.
Answer:
Peter
Explanation:
Peter has more power, as he is able to lift the same amount of weight as Paul in a much shorter time.
If Paul can lift 100kg 10 times in 1 minute, and Peter can lift 100kg 10 times in 10 seconds, Peter is 6 times stronger than Paul, because 1 minute, or 60 seconds, is 6 times longer than 10 seconds.
A student mixed 50 ml of 1.0 M HCl and 50 ml of 1.0 M NaOH in a coffee cup calorimeter and calculated the molar enthalpy change of the acid-base neutralization reaction to be –54 kJ/mol. He next tried the same experiment with 100 ml of 1.0 M HCl and 100 ml of 1.0 M NaOH. The calculated molar enthalpy change of reaction for his second trial was: Group of answer choices
Answer:
-54 kJ/mol
Explanation:
Given that:
A student mixed 50 ml of 1.0 M HCl and 50 ml of 1.0 M NaOH in a coffee cup calorimeter and calculated the molar enthalpy change of the acid-base neutralization reaction to be –54 kJ/mol
i.e
50 ml of 1.0 M HCl + 50 ml of 1.0 M NaOH -----> -54 kJ/mol
If he repeat the same experiment with :
100 ml of 1.0 M HCl + 100 ml of 1.0 M NaOH. ------> ????
From The experiment; the molar enthalpy of change of the acid-base neutralization reaction will be -54 kJ/mol
This is because : The second reaction requires 50 ml in order to neutralize the reaction, then the remaining 50 ml will be excess, Hence, there is no change in the enthalpy of the reaction.
Similarly; we can assume that :
In the first reaction; P moles of is used to liberate Q kJ heat ; then the change in molar enthalpy will be Q/P (kJ/mol).
SO; when he used 100 ml ;
then the amount of moles used is double, likewise the heat liberated will be doubled ;
So;
2P moles is used to liberate 2Q kJ heat ;
2P/2Q = Q/P ( kJ/mol) = -54 kJ/mol
Exposure of silver Chloride to sunlight for a long
duration turns grey due to
Answer:
Exposure of silver chloride to sunlight for a long duration turns grey due to photolytic decomposition i.e decomposition in the presence of sunlight.
Explanation:
When silver chloride, AgCl is exposed to sunlight for a long time, it will undergo decomposition as the sunlight provides sufficient energy needed to decomposed the salt, AgCl to metallic silver and chlorine gas. This can be seen in the equation below:
2AgCl —> 2Ag + Cl2
A chemical equilibrium between gaseous reactants and products is shown. N2(g) + 3H2(g) ⇌ 2NH3(g) How will the reaction be affected if the pressure on the system is decreased?
Answer:
reaction goes backward
as pressure decreases reaction shifts to more no of moles side that is 4 moles on left side
write the word equations and chemical equations of displacement reaction
A single displacement reaction, is a chemical reaction in which one (or more) element(s) replaces an\other element(s) in a compound. It can be represented generically as: A+B-C--->A-C+B.
I hope this helps..
Calculate the percent composition by mass of the following compounds that are important starting materials for synthetic polymers: a. C3H4O2 (acrylic acid, from which acrylic plastics are made) b. C4H6O2 (methyl acrylate, from which Plexiglas is made) c. C3H3N (acrylonitrile, from which Orlon is made)
Answer:
C₃H₄O₂ → 50% C; 5.5 % H; 44.5% O
C₄H₆O₂ → 56 % of C; 7 % of H; 37% of O
C₃H₃N → 68 % of C; 6 % of H; 26 % of N
Explanation:
We determine the molar mass of each compound:
C₃H₄O₂ → 72 g/mol
In 1 mol of acrylic acid (72 g), we have:
3 moles of C → 12 g/mol . 3 mol = 36 g of C
4 moles of H → 1 g/mol . 4 mol = 4 g of H
2 moles of O → 16g/mol . 2 mol = 32 g of O
Then in 100 g of salt, we may have:
100 . 36 / 72 = 50 % of C
4 . 100 / 72 = 5.5 % of H
32 . 100 / 72 = 44.5 % of O
C₄H₆O₂ → 86 g/mol
In 1 mol of methyl acrylate (86 g), we have:
4 moles of C → 12 g/mol . 4 mol = 48 g of C
6 moles of H → 1 g/mol . 6 mol = 6 g of H
2 moles of O → 16g/mol . 2 mol = 32 g of O
Then in 100 g of salt, we may have:
100 . 48 / 86 = 56 % of C
6 . 100 / 86 = 7 % of H
32 . 100 / 86 = 37 % of O
C₃H₃N → 53 g/mol
In 1 mol of acrylonitrile (53 g), we have:
3 moles of C → 12 g/mol . 3 mol = 36 g of C
3 moles of H → 1 g/mol . 3 mol = 3 g of H
1 mol of N → 14g/mol . 1 mol = 14 g of N
Then in 100 g of salt, we may have:
100 . 36 / 53 = 68 % of C
3 . 100 / 53 = 6 % of H
14 . 100 / 53 = 26 % of N
The pressure of a 1-L nitrogen gas sample at 25 ⁰C is 0.30 atm. The pressure of a 1-L oxygen gas sample at the same temperature is 0.25 atm. The oxygen gas sample is added to the nitrogen container. Argon gas is added to the mixture until the total pressure of the 1-L container reaches 1.00 atm, and the temperature is adjusted to 25 ⁰C. According to Dalton’s Law of Partial Pressures, the contribution of each gas to the total pressure of the gas mixture is: Nitrogen _____________ Oxygen _____________ Argon _____________
Answer:
Nitrogen = 0.3 atm
Oxygen = 0.25 atm
Argon = 0.45 atm
Explanation:
According to Dalton's law of partial pressure, the total pressure in the container is equal to sum of the partial pressures of the individual gases.
Given;
Total pressure of the gases, P_total = 1 atm
Pressure of nitrogen, P_nitrogen = 0.3 atm
Pressure of oxygen, P_oxygen = 0.25 atm
Pressure of argon, P_argon = ?
[tex]P_{total} = P_{nitrogen} + P_{oxygen} + P_{argon}\\\\1 \ atm= 0.3 \ atm + 0.25 \ atm + P_{argon}\\\\1 \ atm= 0.55 \ atm + P_{argon}\\\\ P_{argon} = 1 \ atm - 0.55 \ atm\\\\ P_{argon} = 0.45 \ atm[/tex]
Therefore, the contribution of each gas to the total pressure of the gas mixture is;
Nitrogen = 0.3 atm
Oxygen = 0.25 atm
Argon = 0.45 atm
In a solution, what is the substance that does the dissolving called? solvent solute saturated precipitate
The substance that does the dissolving is called Solvent
A solution is refereed to as a homogeneous mixture containing two or more substances. Solutions are commonly observed in liquids, although solutions of gases and solids can be possible. Every solution contains
SoluteSolventThe solute is referred to as the substance that is being dissolved to form a solute example Sugar, salt, etc.
The solvent is the substance that dissolves the solute example The solvent in the solution of water and sugar is Water .
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Pb2+(aq) + 2 e- --> Pb(s) Eo = -0.13V Zn2+(aq) + 2 e- --> Zn(s) Eo = -0.76V 9. Given the half-cell potentials above, when the reaction Zn(s) + Pb2+(aq) --> Zn2+(aq) + Pb(s) is made into a voltaic cell, the Ecell is: A. 0.63 V B. -0.63 V C. 0.89 D. 0.89
Answer: The [tex]E_{cell}[/tex] is 0.63 V
Explanation:
In the given reaction :
[tex]Zn(s)+Pb^{2+}(aq)\rightarrow Zn^{2+}(aq)+Pb(s)[/tex]
Here Zn undergoes oxidation by loss of electrons, thus act as anode. Lead undergoes reduction by gain of electrons and thus act as cathode.
[tex]E^0_{cell}=E^0_{cathode}- E^0_{anode}[/tex]
Where both [tex]E^0[/tex] are standard reduction potentials.
[tex]E^0_{[Pb^{2+}/Pb]}= -0.13V[/tex]
[tex]E^0_{[Zn^{2+}/Zn]}=-0.76V[/tex]
[tex]E^0_{cell}=E^0_{[Pb^{2+}/Pb]}- E^0_{[Zn^{2+}/Zn]}[/tex]
[tex]E^0_{cell}=-0.13-(-0.76)=0.63V[/tex]
Thus the [tex]E_{cell}[/tex] is 0.63 V
Formula to find mass percent of an element
Answer:
Explanation:
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Featured snippet from the web
To find the mass percent composition of an element, divide the mass contribution of the element by the total molecular mass. This number must then be multiplied by 100% to be expressed as a percent.
Which substance is a mixture? Table salt, gasoline, aluminum, carbon dioxide?
Answer:
b.) gasoline
Explanation:
The rest mentioned are pure substances/compounds which is not a mixture.
A substance is said to be a mixture if they are not able to get dissolved completely in the solution. Gasoline is a mixture. Thus, option B is correct.
What are mixtures?Mixtures are the substances that are formed by mixing two or more compounds that have been not able to show any chemical bond and linkage. They are physical combinations rather than chemicals.
Gasoline is a homogeneous mixture that is formed by the combination of hydrocarbons and differs from other substances that are pure substances or compounds.
Table salt, aluminum, and carbon dioxide are pure substances that are formed of the same type of molecules or atoms. Table salt is made of Na and Cl atoms, aluminum is made of a single atom, and carbon dioxide of carbon and oxygen atom.
Therefore, gasoline is a mixture.
Learn more about mixtures here:
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Ayuda por favor no entiendo nada voy a reprobar 2- Completa el siguiente cuadro indicando la cantidad de partículas subatómicas fundamentales para cada uno de los siguientes átomos: Atomos | N° atómico | N° de protones | N° de electrones | N° de neutrones 7 Li 20Ne 35Cl 31P 80Br 14C
Answer:
Explanation:
Litio -7 (⁷₃Li)
número de protones = 3
número de electrones = 3
número de neutrones = 4
Neon- 20 (²⁰₁₀Ne)
número de protones = 10
número de electrones = 10
número de neutrones = 10
Cloro - 35 (³⁵₁₇Cl)
número de protones = 17
número de electrones = 17
número de neutrones = 18
Fósforo - 31 (³¹₁₅P)
número de protones = 15
número de electrones = 15
número de neutrones = 16
Bromo - 80 (⁸⁰₃₅Br)
número de protones = 35
número de electrones = 35
número de neutrones = 45
Carbono - 14 (¹⁴₆C)
número de protones = 6
número de electrones = 6
número de neutrones = 8
help pls!!!!!!!!!!!!
Answer:
C, 3.00 moles
Explanation:
First, balance the equation.
4Al + 3O2 ---> 2Al2O3
From the balanced equation, assuming Al is limiting, the mole ratio of Al:Al2O3 = 4:2 = 2:1,
meaning every 2 moles of Al used, produces 1 mole of Al2O3.
So, since 1.5 moles of Al2O3 is produced,
the no. of moles of Al used = 1.5 x2
= 3.0 moles
= C
COMPUESTOS ORGANICOS Escribe el nombre correctamente de los siguientes compuestos orgánicos: necesito ayuda con esto por favor!
Answer:
a. p-bromofenol o 4-bromo-fenol.
b. Diisopropil éter.
c. p-nitrofenol o 4-nitro-fenol.
d. isopropil-fenil éter o fenóxido de isopropilo.
Explanation:
Hola.
En este caso, siguiente las normas IUPAC de nomenclatura orgánica, obtenemos los siguientes nombres:
a. p-bromofenol o 4-bromo-fenol: nota que el bromo es un radical presente en el cuarto carbono del fenol dado.
b. Diisopropil éter: en este caso, nota que el oxígeno central hace que la molécula sea un éter, cuyos radical son ambos isopropil.
c. p-nitrofenol o 4-nitro-fenol: nota que el nitro (NO2) es un radical presente en el cuarto carbono del fenol dado.
d. isopropil-fenil éter o fenóxido de isopropilo: nota que el oxígeno central hace que la molécula sea un éter, cuyos radical son isopropily y el otro fenil, por lo que se nombran en orden alfabético o de número de carbonos (de más a menos).
¡Saludos!
Which two properties define the critical point of matter in a phase diagram?
Answer:
C: pressure and temp
Explanation:
Why do alkenes not appear in the periodic table
Answer:
Alkenes are unsaturated hydrocarbons.
Alkenes do not appear in the periodic table because the periodic table consists only of elements.
Consider the balanced equation below. 8H2 + S8 Right arrow. 8H2S Based on the mole ratios, what can most likely be predicted? 1 mol of hydrogen will react with 1 mol of sulfur. 8 mol of hydrogen will react with 1 mol of sulfur. 8 mol of hydrogen will react with 8 mol of sulfur. 16 mol of hydrogen will react with 8 mol of sulfur.
Answer:
8 mol of hydrogen will react with 1 mol of sulfur.
Explanation:
We'll begin by writing the balanced equation for the reaction.
This is given below:
8H2 + S8 —> 8H2S
Now, let us carefully observe the mole ratio of the reactants.
This is illustrated:
The mole ratio of the reactants ( i.e H2 and S8) is 8 : 1
From the balanced equation above,
We can thus, concluded that:
8 moles of H2 will reacted with 1 mole of S8.
Answer:
b
Explanation:
edge 2021
A student lifts a box of books that weighs 350 N. The box is lifted 4.0 m. How much work does the student do on the box?
Explanation:
F=350N
d=4m
W=F*d
=350*4
=1400 NM
Examine the graph showing the half life of the radioactive isotope substance x. Based on this graph, what might be the best use of thos radioactive isotop?
Determining the age of the objects less than 50000 years old.
Long term radioactive dating such as in dating rocks
Short term radioactive imaging such as nuclear medicine.
Determining the age of objects over 1000000 years old
Answer:
Long term radioactive dating such as in dating rocks
Explanation:
If we examine the graph carefully, we will notice that the number of atoms falls to zero after about 40000 years. This is quite a long time! Many rock formations were formed thousands of years ago and their ages can only be measured by an isotope that has an equally long half life.
Hence for an isotope with such a long half-life, we can effectively measure the age of a rock formation that contains the particular isotope in question. Rocks are composed of diverse chemical isotopes which are normally used to determine the age of the rock formation. Since rocks were formed thousands of years ago, these isotopes must be capable of having a half-life of thousands of years also in order to be useful in measuring the age of rocks.
How do I write these decimal numbers in expanded form? 0.913, 0.205, 0.047, 0.480
Thanks! :)
Explanation:
To write a decimal in expanded form, write the number as a sum of its place values.
0.913 = 0.9 + 0.01 + 0.003
0.205 = 0.2 + 0.005
0.047 = 0.04 + 0.007
0.480 = 0.4 + 0.08
Why is making proteins important
(SOMEONE HELP!!! PLEASE) What are some similarities and differences between ionic and covalent bonds?
Answer:
Ionic and covalent bonds are different in many ways.
Explanation:
A covalent bond is where electrons are shared between several atoms and is apparent in H20 also known as water.
Ionic bonds occur when an atom "gives away" one of its electrons to another one, and due to this difference in charge, they are attracted to each other.
Here is a list of differences:
Ionic bonds are typically strongerCovalent bonds have atoms that are electrically neutral, while ionic bonds have electrically charged atomsCovalent bonds are far more common in nature than ionic bondsCovalent bonds from between two non metals, whereas ionic bonds are formed by a metal and a nonmetalIonic compounds are usually solid whereas Covalent compounds are usually liquid or gasCovalent bonds can form between two atoms of the same element, where this is not possible with ionic bonds.Here are some similarities:
Valence electrons are involved in both bonding processesThe result of both bonds is electrically neutral, even if each individual atom isn'tWhen atoms bond together, they release heat whether or not they are covalent or ionicBoth covalent and ionic bonds lead to stable compounds.Hope this helps!
help pls,,,,,,,,,,,,
What are two important fuels that comes out of the oil refining process?
Diesel fuel and kerosene.
Gasoline and diesel are used as fuels for motor vehicles.
Kerosene is used as jet fuel.
Naphthar is a major petrochemical feedstock.
I hope this helps..
A welding torch produces a flame by burning acetylene fuel in the presence of oxygen. This flame is used to melt a metal. Which energy transformation represents this process?
chemical energy into thermal energy
kinetic energy into potential energy
kinetic energy into electromagnetic energy
potential energy into chemical energy
Answer:
chemical energy into thermal energy
Explanation:
The reaction taking place is as follows
2C₂H₂ + 5O₂ = 4CO₂ + 2H₂O + Heat
In this reaction bonds present in acetylene is broken and new bond present in water and carbon dioxide are formed . In the whole process of bond breaking and bond formation , there is net loss of energy and that energy is released as heat energy .
Thus we can say that in the whole process , chemical energy is converted into heat energy .
Answer:
A: chemical energy into thermal energy.
Explanation:
The protoplasm of a living cell is made up of nucleus and what ?
Answer:Carbon containg molecules
Explanation:
Protoplasm is made up of necleus and carbon containing molecules
Answer:
Protoplasm is composed of a mixture of small molecules such as ions, amino acids, monosaccharides and water, and macromolecules such as nucleic acids, proteins, lipids and polysaccharides. In eukaryotes the protoplasm surrounding the cell nucleus is known as the cytoplasm and that inside the nucleus as the neoplasm.
Explanation: