Answer:
B
Explanation:
CH4 + 2 O2 → CO2 + 2 H20
12 + I X 4 → → 2 ( I X2 + 16 )
16 → → 36
25, 5 → → ?
amount of H2O = 36 X 25,5 / 16 = 57. 39
One mole or 16 g of methane gas reacts with excess oxygen to give 2 moles or 36 g of water. Then, the mass of water produced from 25.5 g of methane is 57.3 g.
What is combustion?Combustion is the reaction of a gas with the atmospheric oxygen producing water and carbon dioxide. The hydrocarbon gases such as methane, ethane etc easily undergo combustion reaction.
As per the given balanced reaction, one mole of methane gas CH4 produces two moles of water.
molar mass of methane = 16 g/mol
molar mass of water = 18 g/mol
mass of 2 moles of water = 36 g.
Hence, 16 g methane gas produce 36 g of water.
The mass of water produced from 25.5 grams of methane gas is then calculated as follows:
mass of water = 25.5 × 36 / 16 = 57.3 g.
Therefore, 57.3 g of water is produced in this reaction from 25.5 g of methane.
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hich of the following is a typical cost associated with renting?
a.
closing costs
b.
down payment
c.
property tax
d.
security deposit
Answer:
D
Explanation:
The other three are related to
a. selling a home
b. buying a home
c. owning a home
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One method used commercially to peel potatoes is to soak them in a solution of NaOH for a short time and then remove them from the NaOH. The peel will have separated from the potato and so it can then easily be sprayed off to yield beautifully peeled potatoes! The NaOH solution however, must be analyzed periodically to make sure its concentration is adequate for the reaction In one such analysis, 45.7 mL of 0.500 M H2SO4 is required to react completely with a 20.0 mL sample of the NaOH solution. The products of the reaction are Na2SO4 and water. What is the concentration of the starting NaOH solution?a. 1.14 M b. 2.28 M c. 0.438 M d. 0.500 M e. 0.571M
Answer:
b. 2.28 M
Explanation:
The reaction of neutralization of NaOH with H2SO4 is:
2NaOH + H2SO4 → Na2SO4 + 2H2O
Where 2 moles of NaOH react per mole of H2SO4
To solve the concentration of NaOH we need to find the moles of H2SO4. Using the chemical equation we can find the moles of NaOH that react and with the volume the molar concentration as follows:
Moles H2SO4:
45.7mL = 0.0457L * (0.500mol/L) = 0.02285 moles H2SO4
Moles NaOH:
0.02285 moles H2SO4 * (2moles NaOH / 1 mol H2SO4) = 0.0457moles NaOH
Molarity NaOH:
0.0457moles NaOH / 0.020L =
2.28M
Right option:
b. 2.28 MThe concentration of the starting NaOH solution is:
b. 2.28 M
Neutralization reaction:
The reaction of neutralization of NaOH with H₂SO₄ is:
2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O
Calculation for concentration of NaOH:We need to find the moles of H₂SO₄. Using the chemical equation we can find the moles of NaOH.
Moles of H₂SO₄:
45.7mL = 0.0457L * (0.500mol/L) = 0.02285 moles of H₂SO₄
Moles of NaOH:
0.02285 moles H₂SO₄ * (2moles NaOH / 1 mol H₂SO₄) = 0.0457moles NaOH
Molarity of NaOH:
0.0457moles NaOH / 0.020L =2.28M
Thus, the concentration of the starting NaOH solution is: 2.28 M.
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To determine the mass of CO2 that forms from a given mass of CaCO3, which of the following must be known? Check all that apply.
To determine the mass of CO₂, the following must be known :
the molar mass of CaCO₃ the mole ratio of CaCO₃ to CO₂ the molar mass of CO₂Further explanationReaction
Decomposition of CaCO₃
CaCO₃ ⇒ CaO + CO₂
Given the mass of CaCO₃, so to determine the mass of CO₂ :
1. Find the mol of CaCO₃ from the molar mass of CaCO₃
[tex]\tt n_{CaCO_3}=\dfrac{mass~CaCO_3}{MW~CaCO_3}[/tex]
2. Find the mole ratio of CaCO₃ : CO₂(from equation = 1 : 1)
[tex]\tt n_{CaCO_3}\div n_{CO_2}=1\div 1[/tex]
3. Find the mass of CO₂ from the molar mass of CO₂
[tex]\tt mass_{CO_2}=n_{CO_2}\times MW_{CO_2}[/tex]
Answer:
1 3 and 5
Explanation:
Describe how you would prepare 5.00 × 102 mL of a 1.75 M H2SO4 solution, starting with an 8.61 M stock solution of H2SO4
We prepare the volume of the 8.61 M stock solution of 0.102 L, then we dilute it by adding water to 0.5 L
Further explanationGiven
5.00 × 10² mL of a 1.75 M H₂SO₄ solution
8.61 M stock solution
Required
The volume of stock solution
Solution
Molarity from 8.61 M to 1.75 M ⇒Dilution
We can use dilution formula :
[tex]\tt \boxed{\bold{M_1.V_1=M_2.V_2}}[/tex]
M₁=8.61 M
V₂=500 ml = 0.5 L
M₂=1.75 M
[tex]\tt V_1=\dfrac{M_2.V_2}{M_1}\\\\V_1=\dfrac{1.75\times 0.5}{8.61}\\\\V_1=0.102~L[/tex]
How does electroplating happen?
A. A thin layer of metal is removed from a cathode.
B. Metal ions form a solid layer on a metal cathode.
C. Metal on a cathode forms ions in solution.
D. Metal ions in solution form a precipitate.
(Answer is B.)
Answer:
B
Explanation:
An electroplating happen when metal ions form a solid layer on a metal cathode. Therefore, option B is correct.
What is an electroplating ?The term electroplating is defined as the process of aligning another metal on the metal. Electroplating is usually used to change the physical properties of an object.
An electroplating is accomplished by an electroplating apparatus that contain a brine solution, a battery, wires, and alligator clips that kept carbon rods attached to the metal to be electroplated and the metal to be layered.
This process is used to give objects increased wear resistance, corrosion protection or aesthetic appeal and greater thickness. While electroplating is like advanced technology. It is primarily used to change the physical properties of an object.
Thus, option B is correct.
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The following half-reaction method is used to balance oxidation-reduction equations.
(1) Determine which atoms change oxidation state from reactant to product in the reaction.
(2) Identify and write half reactions (oxidation and reduction).
(3) Return to the original chemical equation to balance it.
(a) Insert the coefficients from the half reactions first.
(b) Inspect the number of each atom on each side for all elements.
Which important step is missing from this procedure?
Check other reactions similar to this one.
Name the elements that are involved in the reaction.
Make sure the reduction half reaction is identified first.
Balance the half reactions based on the number of electrons.
Answer:
its (D) Balance the half reactions based on the number of electrons.
Explanation:
Answer:
D ✔️
Explanation:
"Balance the half reactions based on the number of electrons."
Fill in the coefficients that will balance the following reaction: (Note: Use 1 as coefficient where appropriate.) NaCl + CaS → Na2S + CaCl2
Answer:
the answer is
2,1,1,1
Explanation:
Which trait can a plant acquire during its lifetime?
O A. A damaged stem
OB. A blue flower color
O C. A long, narrow leaf shape
O D. A smooth seed texture
Answer:
OB
Explanation:
wat does aquire mean
Answer:
a
Explanation:
a damaged stem
If an element has 3 valence electrons, what charge will likely form on its ion
The element will lose electrons to become stable if the valence shell contains 3 or fewer electrons. The production of cations is a sign of electron loss. The species having positive charge are called cations. As a result, the ion will get a positive charge.
What is ion ?An atom or molecule with a net electrical charge is known as an ion. Conventionally, the charge of an electron is thought to be negative; this charge is equal to and opposite to the charge of a proton, which is thought to be positive.
An atom will shed its valence electrons in order to become a charged ion and create an ionic bond with another atom if it lacks one to three of them.
A positive ion is created by taking electrons from a neutral atom, whereas a negative ion is created by adding electrons to a neutral atom. The quantity of protons remains constant during the formation of an ion.
Thus, the ion will get a positive charge.
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A sample of Neon and Helium gases at 298 K have a total pressure of 29 atm. If the partial pressure of He is 6 atm, what is the mole fraction of neon?
Please please please help please
Arrange the following 0.10 M aqueous solutions in order of increasing pH:
a. NaOH
b. HBr
c. NaCH3CO2
d. KBr
e. NH4Br.
Answer:
The correct answer is HBr<NH4Br<KBr<NaCH3CO2<NaOH.
Explanation:
When salt is added to the water, the formation of acid and base takes place. The pH helps in predicting the basicity, acidity, and neutrality of a compound.
It is known that NaOH is a strong base, thus, its solution will be basic, and therefore, the pH of NaOH will be greater than 7.
The solution of HBr will be acidic as HBr is the strong acid, thus, its pH will be less than 7.
In dissolving NaCH3CO2 in water, the formation of CH3COOH, which is a weak acid, and NaOH that is, a strong base takes place. Therefore, as NaOH is the strong base, the solution will be basic, and the pH of NaCH3CO2 will be greater than 7.
On dissolving KBr in water, HBr, that is, a strong acid, and KOH, that is, a strong base is produced. Therefore, as HBr is the strong acid, and KOH is the strong base, the solution will be neutral. Thus, the pH of KBr will be equivalent to 7.
On dissolving NH4Br in water, the formation of HBr, that is, strong acid, and NH4OH, that is, the weak base takes place. Therefore, as HBr is the strong acid, the solution will be acidic, and the pH of NH4Br will be less than 7.
Hence, the increasing order of pH of 0.10 M aqueous solution will be,
HBr<NH4Br<KBr<NaCH3CO2<NaOH
The order of increasing pH of the solutions is; HBr < NH4Br < KBr < NaCH3CO2 < NaOH.
pH is a number that indicates the degree of acidity or alkalinity of a substance. The pH scale ranks from 0 - 14. 0 - 6.9 indicates acidity, 7 indicates neutrality while 8 - 14 indicates alkalinity.
The order of increasing pH of the solutions is; HBr < NH4Br < KBr < NaCH3CO2 < NaOH. Recall that NH4Br yields an acidic solution while NaCH3CO2 yields a basic solution.
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Which of the following determines the identity of an element?
PLEASE HELP. ONLY IF YOU KNOW THE ANSWER
Answer:
24. B
25. B
26. B
Explanation:
24. As depicted in the image attached, all living organisms including animals undergo cellular respiration, which is the process whereby sugar molecule is broken down to release energy (ATP). In this process, CARBON DIOXIDE (CO2) is released as a product. The equation is as follows:
C6H12O6 + 6O2 → 6CO2 + 6H2O + energy
On the other hand, plants undergo a unique process called photosynthesis in order to synthesize their food (sugars) and hereby release oxygen gas in the process. Based on the diagram in option B, plants release oxygen using CO2, while animals release CO2 using O2.
25. The structure depicted in the image of this question is an organelle called MITOCHONDRIA. The mitochondrion is the site of cellular respiration (Krebs cycle and ETC) in eukaryotic cells.
26. Photosynthesis is a metabolic process unique to the cells of autotrophic organisms like green plants. It is the process where they synthesize their food in form of organic molecules using SUNLIGHT as a source of energy.
6CO2 + 6H2O + sunlight → C6H12O6 + 6O2
what are the 5 steps to drawing a lewis structure??
what deos sedimentation mean
Answer:
This is the tendency for particles in suspension to settle out of fluid in which they are contained and come to rest against a barrier.
Explanation:
In sedimentation, the particles are in a fluid and under the influence of forces , for example, gravitational forces, they settle and then come to rest when faced with a barrier.
The settling process is the process in which the particles fall out of liquid and sedimentation is the end of the process.
what is the meaning of the word hydrocarbons
Answer:
An organic compound (such as acetylene or butane) containing only carbon and hydrogen and often occurring in petroleum, natural gas, coal, and bitumens.
Explanation:
Iooked it up
What is the conjugate acid of the acetate ion?
Answer:
Hydronium ion is the conjugate acid of water.
Exaplination:Acetic acid is the conjugate acid of acetate ion. Hydronium ion is the conjugate acid of water.
1. Which groups of the periodic table constitute p-block?
If you have 23.8g of CaCl2, how many formula units is it?
Answer:
1.3×10²³ formula unit
Explanation:
Given data:
Mass of CaCl₂ = 23.8 g
Number of formula unit = ?
Solution:
Number of moles = mass/molar mass
Number of moles = 23.8 g/110.98 g/mol
Number of moles = 0.21 mol
1 mole of any substance contain 6.022×10²³ formula unit
0.21 mol × 6.022×10²³ formula unit / 1mol
1.3×10²³ formula unit
describe manganese as oxidizing agent
Answer:
See explanation
Explanation:
A reducing agent in chemistry is any substance that accepts electrons and its oxidation number is decreased in a redox reaction.
Manganese occurs in a variety of oxidation states; +7, +6, +5, +4, +3, +2. This makes it an exceptionally good reducing agent since it can accept different number of electrons and change from one oxidation state to another.
The commonest compound of manganese used as a strong oxidizing agent is KMnO4 in which manganese has an oxidation number of +7.
One sugar produced by photosynthesis is called
Consider the elements: Na, Mg, Al, Si, P.
a. Which element has the lowest second ionization energy?
b. Which element has the smallest atomic radius?
c. Which element is least metallic?
d. Which element is diamagnetic?
Answer:
The elements mentioned in the series are Na, Mg, Al, Si, and P. It can be seen that all these elements are located in the same period. The atomic number of the mentioned elements are Na-11, Mg-12, Al-13, Si-14, and P-15.
a) There will be an increase in the ionization energy with the increase in the element's atomic number across a period. More energy is needed to withdraw an electron from a completely occupied shell in comparison to an incompletely occupied shell.
The atomic number of Na is 11. When one electron is withdrawn from Na, it gets converted into the inert gas configuration of Ne. Thus, it will require more energy to withdraw the second electron from Na. Hence, Na exhibits the lowest second ionization energy.
b) Across the period, with an increase in the element's atomic number, the atomic radii reduces from left to right. Thus, P exhibits the smallest atomic radius.
c) The metallic nature of the elements reduces from left to right across a period in the periodic table. Thus, P is the least metallic element.
d) Diamagnetic signifies towards the element that exhibits pair electrons in its sub-shells. The electronic configuration of Mg is,
1s2 2s2 2p6 3s2
In Mg, no unpaired electrons are present, while all the remaining elements mentioned exhibit unpaired electrons in their valence shell. Thus, Mg is the diamagnetic element.
3
Solve and derive the unit for Power
Answer:
Unit of power is watt
Explanation:
Power = rate of doing work
or
Power, P = W/t
Where
W is work done and t is time
The unit of work done is Joules and that of time is seconds.
Power, P = J/s
We know that, J/s = watts
Hence, the unit of power is watts.
A subrule of the Cahn-Ingold-Prelog system specifies that higher mass number takes precedence over lower when distinguishing between isotopes. Determine the absolute configurations of the reactant and product in the biological oxidation of isotopically labeled ethane.
Answer:
The correct answer is - S- configuration.
Explanation:
Placing the numbers in order of the priorities of each reactant in the reaction is essential to determining the configuration of the reactant and product in the biological oxidation of isotopically labeled ethane.
CH3 - T- D is the correct order of the increasing of the priorties. so this is moving from CH3 to D which is Anti-clockwise which means the configuartion is S as we know clockwise movement is R configuarion and anti-clockwise in S configuartion.
Naming Ionic Compounds.
What is the neutral Ionic Compound name of Be^+2 & S^-2?
What is the neutral Ionic Compound name of Pb^+2 & CO3^-2?
Answer:For binary ionic compounds (ionic compounds that contain only two types of elements), the compounds are named by writing the name of the cation first followed by the name of the anion. For example, KCl, an ionic compound that contains K+ and Cl- ions, is named potassium chloride.
Explanation:
PLEASE HELP WILL GIVE BRAINLEIST ASAP Determine the fraction of an original sample of K-42 that remains unchanged after 24.72 hours.
Answer:
25% or 0.25 or 1/4
Explanation:
don't know which form you need so here you have all 3
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A group of organs working together to perfrom a certain function called
Answer:
group. hfdzybidddiklllnjjooolll
Answer:
An organ system
Explanation:
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Genetically engineered crops (3 points)
A. are often unsuccessful
B. create optimum soil
C. increase crop yields
D. prevent weed growth
Answer:
C. increase crop yields
Explanation:
Genetically modified organisms are those organisms that have been improved using genetic engineering procedures. Genetic engineering/modification is the manipulation of an organism's genome in order to get an improved organism with desirable traits.
The organisms being genetically modified or engineered is called GMO or transgenic organisms. Hence, in this case, one feature of the crops being genetically modified is to have an INCREASED YIELD.
write the general formula of a. alkane b. aikyl radicals radicals
Answer:
General formula of alkanes is: [tex]C_{n}H_{2n+2}[/tex]
General formula of alkyl: [tex]C_{n}H_{2n+1}[/tex]
