For the creation of water, molecular oxygen provides the oxygen atom.
Where does the oxygen atom come from that directly contributes to the creation of water?As the ETC's final electron acceptor, oxygen performs this function. The oxygen atoms then absorb the electrons from the complex IV and combine with the protons of hydrogen to form water. The oxygen atoms are extracted from the gaseous oxygen.
Where does the oxygen atom that is needed to create water during aerobic respiration come from?All that is known is that this oxygen atom was initially one of the atoms in the process' reactants.
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how many grams of solid sodium cyanide should be added to 0.500 l of 0.267 m hydrocyanic acid solution to prepare a buffer with a ph of 10.400? (ka for hydrocyanic acid
0.0163 mol of sodium hydroxide needed to be added 0.500 l of 0.267 m hydrocyanic acid solution to prepare a buffer with a pH of 10.400.
Ka HCN= 4x[tex]10^{-10}[/tex]
Pka HCN = 9.4
pH = Pka + log [tex]\frac{A}{HA}[/tex]
10.400 = 9.4 + log [tex]\frac{A}{HA}[/tex]
log [tex]\frac{A}{HA}[/tex] = 1
[tex]\frac{A}{HA}[/tex] = 10
let W be the mole of NaOH be used
NaOH = [tex]\frac{w mol . 1000ml}{500 .1L}[/tex] = 5 w mol
NaOH + HCN → NaCN +H2O
thus 5 mole of NaOH combines with 5 mole of HCN to for 5 mole of NaCN
[tex]A^{-}[/tex] = (0.1 +5w) M
HA = 0.267 -5w) M
[tex]\frac{A}{HA}[/tex] = 0.1 + 5w/ 0.1 -5w
10 = 0.1 +5w ? 0.1 - 5w
0.1 +5 w = 10 (0.1- 5w)
0.9 = 55w
w = 0.0163 mol
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5. What is the balanced equation for the reaction of aqueous cesium sulfate and aqueous barium perchlorate?
CS₂SO4(ag) + Ba(CIO4)2(ag) → 2 CSCIO4(s) + BaSO4(ag)
O CS2SO4(ag) + Ba(CIO4)2(ag) → 2 CSCIO4(ag) + BaSO4(s)
CS2SO4(ag)
+ Ba(CIO4)2(aq) → 2 CSCIO4(e) +BaSO4(s)
O CS2SO4(ag) + Ba(CIO4)2(aq) → no reaction
Cs₂SO₄(aq) + Ba(ClO4)₂(aq) → 2 CsClO₄(aq) + BaSO₄(s) is the balanced equation for the reaction of aqueous cesium sulfate and aqueous barium perchlorate.
What is a balanced equation?An equation for a chemical reaction is said to be balanced if both the reactants and the products have the same number of atoms and total charge for each component of the reaction. In other words, both sides of the reaction have an equal balance of mass and charge.The reactants and products of a chemical reaction are listed in an imbalanced chemical equation, but the amounts necessary to meet the conservation of mass are not specified.It is typical to balance chemical equations for both mass and charge in aqueous solutions. Equal numbers and types of atoms are produced on both sides of the equation when balancing for mass. When the charge is balanced, there is no net charge on either side of the equation. Only the ions are shown in the equation and they are in water because the state of matter (aq) stands for aqueous.To learn more about balanced equation, refer to
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Dna damage leads to accumulation of ________ p53, which _______ production of a cdk inhibitor to ________ the cell cycle.
DNA damage leads to accumulation of ____phosphorylated____ p53, which ___increases____ production of a CDK inhibitor to ___halt_____ the cell cycle.
What is phosphorylation?Phosphorylation is the attachment of phosphate groups to molecules or ions. This process and its reverse dephosphorylation are widely used in biology. Phosphorylation of proteins often activates many enzymes. Protein kinases are activated by phosphorylation, activating a series of events that lead to phosphorylation of various amino acids.
When activated, p53 induces the expression of various gene products, causing either prolonged cell cycle arrest in G1, preventing proliferation of damaged cells, or apoptosis to remove damaged cells from the body .
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The products of electrolysis can vary depending on whether the salt forming the electrolyte is molten or in aqueous solution.
Explain this statement by referring to the products of electrolysis of molten sodium chloride and of electrolysis of sodium chloride solution.
Include in your answer the names of all the ions present in each electrolyte and how the product at each electrode is formed from ions present.
You may use half-equations if you wish. USE BULLET POINTS.
(8 marks)
The products of electrolysis includes hydrogen gas and chlorine gas.
What distinguishes the electrolysis of molten salt from that of an aqueous solution?It is significant to remember that the difference between the electrolysis of aqueous and molten sodium chloride results from the fact that the reduction of the sodium ion, or Na+, is energetically more challenging than the reduction of water. Therefore, in the case of aqueous sodium chloride, the reduction of water occurs instead of the reduction of sodium.
Since the water molecules can also provide hydrogen ions (H +) and hydroxide ions (OH -), in addition to the ions from the ionic compounds, electrolyzing aqueous solutions of ionic compounds may be more challenging than electrolyzing molten compounds.The fact that an electrolyte must be molten or in solution stems from the fact that ions, not electrons, carry current through the electrolyte. Those ions are immobile in solids.To know more about electrolysis visit:
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how many resonance structures are possible for the phosphate ion, po43-, in which the phosphorus atom has zero formal charge?
Five resonance structures are possible for the phosphate ion, PO₄³⁻ and the formal charge are on the each oxygen atom
Resonance structure is the set of Lewis structure that describe the delocalization of electron in a polyatomic ion or a molecule
We can draw five resonance structure for PO₄³⁻ but one of them is a minor contribution to the resonance hybrid and four oxygen atom single bonded to a phosphorus atom and give every atom an octet and this is not a good structure because it has five atom with formal charges and reduce the number of charges by moving electron to convert a P-O single bond to a P=O double bond and there are four P-O bonds and these are all equivalent and are the major contribution to the resonance hybrid that's why the actual structure is a resonance hybrid of all five structure
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Calculate the change in temperature produced by the addition of 1 kcal of heat to 100 g of steel.
Calculate the change in temperature produced by the addition of 1 kcal of heat to 100 g of steel.
Csteel= 0.118
Change in temp: 84.7 degrees Celsius
Explanation:
1. (Write down all units.)
q= 1
m= 100
C= 0.118
2. (Remember q=mcΔT)
3. (Calculate the amount needed to raise the 100g by 1 degree.)
100 x 0.118= 11.8 c
4. (Convert kcal to cal.)
1 kcal= 1000 calories.
5. (Divide calories given by calories needed.)
1000/11.8= 84.75
how many photons with a wavelength of 749 nm are needed to melt 445 g of ice? the enthalpy of fusion of water can be found in this table.
The number of photons required with a wavelength of 749 nm are needed to melt 445 g of ice is 5.12 × 10²³.
The energy of one photon is given as,
E = (h × C) / λ
E = (6.626 × 10⁻³⁴ × 3 × 10⁸ m/s) / (749 nm × 10⁻⁹ nm/m)
⇒ E = 0.02653 × 10⁻¹⁷ = 2.65 × 10⁻¹⁹ J
The enthalpy of fusion of water is 333.55 J/g.
To melt 445 g of ice, the energy needed = 445 g × 333.55 J/g = 135755 J
Hence, the number of photons required = (135755 J) / (2.65 × 10⁻¹⁹)
= 51228.301 × 10⁻¹⁹
= 5.12 × 10²³
Hence the number of photons required is 5.12 × 10²³.
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how much energy, in units of kj/mol, is released by the formation of all the bonds in water (h 2o)? give your answer as a negative number, since energy is released.
-464 4kJ/mol is released by the formation of all the bonds in water (h 2o)
What is bond energy?
Bond energy, which is the amount of energy required to separate the atoms forming a molecular bond into free atoms, is a measurement of how strong a chemical bond is.
The average will be more accurate if additional bond energies of the bonds in various compounds are considered. However, Bond-dissociation energies tailored to a given molecule are more accurate than average bond values. In comparison to single bonds, double bonds have larger energy levels (but not necessarily 2-fold higher).
Compared to double and single bonds, triple bonds have a higher energy level (but not necessarily 3-fold higher).
O-H in H2O has a -464 kJ/mol average bond energy. This is because the O-H bond dissociates with -428 kJ/mol, but the H-OH bond takes 498.7 kJ/mol.
(498.7kJ/mol+428kJ/mol)÷2=-464kJ/mol
Hence , -464 4kJ/mol is released by the formation of all the bonds in water (h 2o)
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when 1.00 l 1.00 l of a 0.500 m l i b r 0.500 m libr solution is tripled by dilution with water, what is the number of moles of lithium in the new solution
When 1.00 L of a 0.500 M LiBr solution is tripled by dilution with water . the number of moles of lithium in new solution is 0.5 moles.
given that :
volume = 1.00 L
molarity = 0.500 M
The solution is tripled by dilution but there will be no effect in number of mole by the dilution.
the number of moles = molarity × volume in L
the number of moles = 1 × 0.500
the number of moles = 0.5 mol
Thus, When 1.00 L of a 0.500 M LiBr solution is tripled by dilution with water . the number of moles of lithium in new solution is 0.5 moles.
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Predict the nature of the indicated
covalent bond. Please help
The indicated covalent bond is a sigma(single) bond which is a strong bond and cannot easily break.
What are covalent bonds?A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms. These electrons are simultaneously attracted to two nuclei. A covalent bond is formed when the electronegativity difference between two atoms is too small for electron transfer to form an ion.
Following are the types of covalent bonds:
Single Covalent Bond.Double Covalent Bond.Triple Covalent Bond.CH₃NH₂ is classified as a covalent compound with the IUPAC name methylamine. Each molecule contains one carbon atom, five hydrogen atoms, and one nitrogen atom, all held together by a single covalent bond.
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When acid is added to pure water, the ph ___________, and when base is added to pure water, the ph ___________.
The pH of clean water increases when an acid is introduced. The opposite is true if a base is introduced to pure water. A solution's hydronium ion concentration must fall as the concentration of hydroxide ions rises.
Why is the pH of pure water neutral?If there are more hydrogen ions than hydroxide ions in a solution (i.e., pH pOH), the solution is acidic. Since the concentration of hydrogen and hydroxide ions in pure water is constant, even when the pH changes, the water remains neutral (pH = pOH).
Can a base increase water's pH?Bases and Acids
An acid is a chemical that, when introduced to pure water, will cause the pH to fall. In a similar way, a base is something that will raise the pH of water by 4.
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What will happen to the amount of the reactants/substrate and products when the chemical reaction starts?
Answer:
they will dissappear
Explanation:
........
.
Element X, the oxide of which has the formulo X₂O7 form with hydrogen a Find the relative atomic that contains 0.78% hydrogen. mass of element x In gas compound in the nucleas of the atom of element x there are 21 more neutrons than photons Find the atomic number Z of element X......Please helppppppp
the atomic number of the element x was found to be +7
what is atomic number ?
A chemical element's nuclear charge number (symbol Z) is the charge number of an atomic nucleus. For conventional nuclei, this is equal to the proton number (np), or the number of protons contained in the nucleus of every atom of that element. The atomic number can be employed to uniquely identify ordinary chemical components. In an ordinary uncharged atom, the atomic number is likewise equal to the number of electrons.
The sum of an ordinary atom's atomic number Z and neutron number N yields the atomic mass number A.
The notion here is that for two covalently bound atoms, oxidation values are assigned by assuming that the more electronegative of the two atoms "takes" all of the bonding electrons shared by the two atoms.
The maximum oxidation state of a specific element happens when all of its valence electrons are "taken" by the atoms to which it is covalently bound.
Since you have X 2 O 7, element X has a + 7 oxidation state.
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Please check 5 and 6 for me
The amount of heat required to completely vaporize the sample is 2,692 J
How to calculate the amount of heat required?To calculate the amount of heat required use this formula
q = m c Δt
where
q = amount of heat required,
m = mass of the sample
c = specific heat,
Δt= change in temperature
Here,
m = 67.3 g,
final temperature = 140°C,
initial temperature = 100°C,
c = 1.00 J/g°C
To find: Amount of heat required = q = ?
Put the given values in the formula above:
q = (67.3 g) × (1.00 J/g°C) × (140-100)°C
q = 2,692 J
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A syringe contains 56. 05 ml of gas at 315. 1 k. What volume will that gas occupy if the temperature is increased to 380. 5 k? 12. 41 ml 46. 42 ml 67. 68 ml 81. 74 ml.
The temperature is increased to 380. 5 k is 67.68ml.
What is the ideal gas law?A hypothetical gas made up of molecules that abide by the following conditions is referred to as an ideal gas: Molecular interactions in ideal gases are neutral. The molecules of an ideal gas wouldn't interact with each other or the container walls other than when they collided in an elastic collision.
Formula
V / T = V₁ / T₁
Given,
V = 56.05 mL
T = 315.1 degrees Kelvin
V₁ = x
T₁ = 380.5 degrees Kelvin
Solution
56.05/315.1 = x/380.5
0.1779 = x / 380.5 (multiply both sides by 380.5)
0.1779 × 380.5 = 380.5x/380.5
x = 67.68 ml
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question a 100g sample of a metal was heated to 100oc and then quickly transferred to an insulated container holding 100g of water at 22oc. the temperature of the water rose to reach a final temperature of 35oc. which of the following can be concluded?
The temperature of the metal varied more than the temperature of the water, but the metal also lost heat generated as the water acquired it.
At what temp does metal weaken?Some of the nearly diamond-hard wear plates used in industrial applications start to weaken between 280° and 350°F. At 280°F, pork butt can be cooked. In general, there is good likelihood that a particularly hard steel component will soften when it is subjected to high temperatures.
What temperature glows metal?Steel emits colors that are incandescent above 800 degrees Fahrenheit. Steel gets an ever brighter shade of red between 1000 and 1500 degrees Fahrenheit. Steel first becomes orange and then yellow between 1600 and 1900 degrees Fahrenheit.
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what is mass of 1000 coulombs of electical charge?
The mass of 1000 coulombs of electric charge are 6.241 ×10^21 C.
What do you mean by electric charge?
Electric charge, a fundamental characteristic of matter possessed by some elementary particles, controls how an electric or magnetic field affects the particles. Positive or negative electric charge exists in distinct natural units and cannot be manufactured or destroyed. Positive and negative charges are the two main categories of electric charges. When two things are reasonably close to one another and one sort of charge is present in excess, they repel one another. When they are relatively close to each other, two things with surplus opposing charges—one positively charged and the other negatively charged—attract to one another.
1 Coulomb of electric charge = 6.241 × 10^18 C.
So, 1000 coulomb of electric charge = (6.241×10^18) ×10^3
⇒6.241×10^21 C.
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what mass (g) of agbr is formed when 35.5 ml of 0.184 m agno3 is treated with an excess of aqueous hydrobromic acid
Mass of AgBr is formed when 35.5 ml of 0.184 m agno3 is treated with an excess of aqueous hydrobromic acid is 1.23g.
What is Stoichiometric?We may calculate reactant and product amounts using balanced chemical equations thanks to the fundamental concept of stoichiometry. The balanced equation's ratios are used in this instance. Generally speaking, how a reaction will behave depends on the amount of substance present.
Equation formed:
AgNO₃(aq) + HBr(aq) ⇒ AgBr(s) + HNO₃(aq)
Calculate the amount of AgNO3 consumed throughout the reaction.
based on molarity (a 1000 ml solution of AgNO3 comprises 0.184 moles).
AgNO₃ moles in 35.5 ml solution = [tex]\frac{(0.184mol) . (35.5ml)}{1000ml}[/tex]
∴ Moles of AgNO₃ = 0.006532 moles
Moles of AgBr formed by 0.006532 moles of AgNO₃
From balanced reaction eq.,
Moles ratio of AgNO₃ : AgBr = 1 : 1 (AgNO₃ = AgBr)
∴ Moles of AgBr = 0.006532 moles
Mass of 0.006532 moles of AgBr,
Molar mass of AgBr = 187.77g/ml
∵ Mass (AgBr) = 187.77 × 0.006532
Mass of AgBr = 1.23g
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Which of the following is an outer planet?
A) Earth
B) Mars
C)Mercury
D)Uranus
Answer: D)Uranus
Explanation:
The outer planets, Mars, Jupiter, Saturn, Uranus, and Neptune, are all known as superior planets because their orbits are farther from the sun than the Earth's.
The outer planets are Jupiter, Saturn, Uranus, Neptune, and Pluto.
Answer: D: Uranus
Explanation:
54 g of water was produced when a sample of methane was burned in an excess of air. What mass of methane was burned assuming complete combustion?.
Assuming complete combustion, the stated statement indicates that 24 g of methane were consumed.
What happens during combustion?In the chemical process of burning, an item swiftly combines with oxygen to produce heat. The initial substance and the supply of oxygen are referred to as fuel and oxidizer, respectively. Despite typically being a liquid, fuel for airplane propulsion can also occasionally be a solid, liquid, or gas.
Briefing:
CH4 + 2O₂——————-> CO₂ + 2H₂O
1 mole of methane, or 16 g, will yield =2 x 18 = 36 g of water.
Thus, = 16/36 x 54 = 24 g of methane will be converted into 54 g of water.
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100 grams of ice at 0 °c is placed in 500 grams of water at 50 °c. What is the final temperature and composition of the mixture?.
The final temperature of the mixture is -9.1°C.
Principle of a Calorimeter.Higher body temperatures release heat while lower body temperatures absorb it. The law of conservation of energy is demonstrated by the calorimetric principle, which states that the total amount of heat lost by a hot body is equal to the total amount of heat gained by a cold body.
Here,
Mass of water [tex]m_{w}[/tex] =500g
Mass of ice [tex]m_{i}[/tex] = 100g
Specific heat of water = 1 cal g⁻¹°c⁻¹
Specific heat of ice = 80 °cal g⁻¹
Let T represent the mixture's final temperature.
How much heat water loses
[tex]m_{w}[/tex] [tex]s_{w}[/tex](∆T)w = 500×1(50-T)
Amount of heat that ice absorbs
[tex]m_{i} L_{fi} + m_{i} s_{w}[/tex](∆T)i = 100×80×100×1(T-0)
In accordance with the calorimetry principle:
Heat gained minus Heat Lost
500×1(50-T) = 100×80+100×1(T-0)
500(50-T) = 8000+100T
2500-500T = 8000+100T
2500-8000 = 100T+500T
-5500 =600T
T = -5500/600
T = -9.1°C.
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Describe solids, liquids, and gases in terms of shape and volume.
Answer:
Solids have a well defined shape and this -the shape- is "independent" of the space, in other words if we take a rock (solid) its shape would be the same (kind of) no matter in which container we put it. The volume is also well defined and easy to measure. We can use a "ruler" to measure the rock. On the other hand, liquids and gases shape will depend on the container (solid container) or their shape will very similar to the solid body containing them; however liquids are more sensible to mechanical forces as Gravity and therefore their shape will result in a combination of the container and the force of gravity (for example), hence if we put water in a cylindrical container but not enough to fully filled then the shape of the liquid will be cylindrical but because gravity it will occupy just the bottom of the container, while the gases are going to expand until cover the whole space of the container.
In short:
Solids: Well defined shape and volume "independent" of the environment
Liquids: Shape dependable of the container, hence not well defined. well define Volume
Gases: Shape and volume dependable of the container.
Which of the following electron configurations would you expect to belong to a reactive nonmetal?check all that apply. ns2np3 ns2np5 ns2 ns2np6
The following electron configurations would you expect to belong to a reactive nonmetal is ns² np⁵.
The reactive non metals are halogens. Halogens have seven electrons in the outermost shell and they only need one electron to complete their octet. This property makes halogen more reactive as compared to the other nonmetal. due to seven electron in outermost shell they readily accept one electron to achieve the stability. The outermost shell electron are called as valence electron. the outmost electronic configuration for halogen mon metals are ns² np⁵.
Thus, The following electron configurations would you expect to belong to a reactive nonmetal is ns² np⁵.
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You have forgotten the ideal gas constant. Describe an experiment, similar to this one, that would allow you to determine the value for r. What information would you need to know about the h2o2 solution?.
Information would you need to know about the H₂O₂ solution is through stoichiometry experiment
The ideal gas constant R can be found experimentally by determining the number of moles of gas that occupies a particular measured volume at a known pressure and temprature and the H₂O₂ is a chemical compound used un various chemical reactions and is slightly viscous than water and the experiment by decomposition of hydrogen peroxide and using the ideal gas law rearrangement equation we can calculate the value of r and we will need the information such as concentration, volume and moles of H₂O₂ to determine its stoichiometry
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a 1.21 buffer solution is 0.332 m in hocl and 0.405 in naocl what is the ph when 88.5 g of hbr is added
The pH when 88.5 g of HBr is added will be 7.224
Molarity of HOCl = 0.332 M
Molarity of NaOCl = 0.405 M
Mass of HBr = 88,5 g
pH after adding 88.5 g HBr = ?
For acidic buffer we use the following formula:
pH =pKa + log (salt / acid)
pKa of HOCl = 7.54
pH = 7.54 + log (0.405 / 0.332)
pH = 7.54 + log 1.22
pH = 7.54 + 0.0864
pH = 7.623
Calculate the pH after adding 88.5 g HBr
First, calculate the number of moles of HBr added
number of moles = mass / molar mass
number of moles of HBr = 88.5 g / 80.91 g/mol
number of moles of HBr = 1.094 mol
Now the acidity of the solution will be:
acidity = 0.332 + 1.094
acidity = 1.426 mol
excess amount of salt = 1.094 - 0.405
excess amount of salt = 0.689 mol
pH = 7.54 + log (0.689 / 1.426)
pH = 7.54 + log 0.483
pH = 7.54 + (-0.316)
pH = 7.224
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Identify each structure based on its label. compound a is a amine. compound b is a amine. compound c is a amine. the common name for the amine d is .
Compound a is a primary amine compound b is a secondary amine compound c is a tertiary amine the common name for the amine d is ammonia
Amines are the organic compound that contain nitrogen atom with a lone pair and they are derived from ammonia means NH₃ in which one or more hydrogen atom is replaced by an alkyl or aryl group and they are known as alkylamines and arylamines
Primary amines are formed when one hydrogen atom in ammonia is substituted by an alkyl or aromatic group and secondary amine have two carbon bonded to the nitrogen and tertiary amines have the three carbon bonded to the nitrogen and ammonia is the gas made up of nitrogen and hydrogen
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This question is about making copper.
Copper is made using a displacement reaction.
Magnesium is added to copper sulfate solution, CuSO4.
Copper and magnesium sulfate solution, MgSO4, are made.
Write a balanced symbol equation for this reaction.
Answer:
Mg + CuSO₄ = Cu + MgSO₄
What are 5 examples of organisms?.
The five example of organisms are any animal, plant, fungus, protist, bacterium.
In biology, what is an organism?An organism is a collection of molecules working to together form a mostly stable whole that demonstrates the characteristics of life. With phrases like "any sense of life, such as with a plant, animal, fungus, or bacterial, capable of growth & reproduction," dictionary definitions are very general.
What types of organisms are examples?A living creature with a organized approach, is capable of responding to stimuli, can reproduce, develop, adapt, and preserve homeostasis is referred to as an organism. Therefore, every animal, plant, fungi, protist, microbe, or archaeon found on Earth would be considered a life.
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_____(1) _____ are made by heating sand silica until it melts into a liquid state. the melted glass can then either be shaped by _____(2) _____ the liquid glass or by pouring the melted glass into a mold. the shape and size of the finished piece depends on the tools and method used by the artist. a. (1) glass pieces of art; (2) condensing b. (1) fiber crafts; (2) hammering c. (1) glass crafts; (2) blowing d. (1) fiber pieces of art; (2) shaping please select the best answer from the choices provided a b c d
Answer: it would be B
Explanation:
I took the test
a sample of gas occupies a volume of 60.7 ml . as it expands, it does 138.1 j of work on its surroundings at a constant pressure of 783 torr . what is the final volume of the gas?
relationship between work pressure and volume can be stated by this formula;
W=PΔV
as we know gas is expanding so it means the work is done by the system
which is shown by a negative sign
W= 138.1 j x 1 L atm / 101.3 j
= - 1.36 L atm
let's convert torr into atm
P = 783 torr X ( 1 atm/ 760 torr)
= 1.03 atm
W = -PΔV
- 1.36 L atm = - 1.03 atm x ΔV
ΔV = 1.36 L atm / 1.03 atm
= 1.32 L
ΔV = [tex]V_{2}[/tex] - [tex]V_{1}[/tex]
= [tex]V_{2}[/tex] - 0.0607 L
[tex]V_{2}[/tex] = 1.32 L + 0.0607 L
= 1.38 L
the final volume of gas is 1.38 L
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