Answers
I hope this helps.
the first line would be SN, 50, 50, 69
second line would be PT, 78, 78, 117
third line would be MO, 42, 42, 54
fourth line would be NI, 28, 28, 31
fifth line would be U, 92, 92, 146
Related Questions
how do I solve for V1 in this equation
Answers
Answer:
\(V_{1} = \frac{P_{2}V_{2}T_{1}}{P_{1}T_{2}}\)Explanation:
\(\frac{P_{1} V_{1}}{T_{1}} = \frac{P_{2}V_{2}}{T_{2}}\)
First of all cross multiply
That's
\(P_{1}V_{1}T_{2} = P_{2}V_{2}T_{1}\)
Next divide both sides by \(P_{1}T_{2}\) in order to isolate \(V_{1}\)
We have
\(\frac{P_{1}V_{1}T_{2}}{P_{1}T_{2}} = \frac{P_{2}V_{2}T_{1}}{P_{1}T_{2}}\)
We have the final answer as
\(V_{1} = \frac{P_{2}V_{2}T_{1}}{P_{1}T_{2}}\)
Hope this helps you
The formula of the following equation is for what type of chemical reaction? *
CxHy+O2--> CO2 +H2O+ energy
Answers
Answer:
flifeee
Explanation:qaSZDFVCVB CDSEW34EDGFBFF
why the nitrogen atom of an amide is not a trigonal pyramidal
Answers
The nitrogen atom in an amide is not trigonal pyramidal because it is involved in resonance with the carbonyl group, leading to the delocalization of electrons and a planar geometry around the nitrogen atom.
In amides, the nitrogen atom is bonded to a carbonyl group (C=O) and two other substituents. Due to the presence of the carbonyl group, resonance can occur between the nitrogen lone pair of electrons and the adjacent carbonyl carbon. This resonance delocalizes the electron density over the nitrogen and oxygen atoms.
As a result of resonance, the nitrogen atom does not possess a pure sp3 hybridization and a trigonal pyramidal geometry. Instead, the nitrogen atom adopts a planar geometry, similar to the carbonyl carbon. The delocalization of electrons through resonance allows the electron density to spread out over the nitrogen and oxygen atoms, resulting in a more stable arrangement.
This resonance stabilization contributes to the characteristic properties of amides, such as their relatively high stability and resistance to hydrolysis compared to other nitrogen-containing functional groups. The planar geometry of the nitrogen atom in amides is a consequence of the resonance interaction with the adjacent carbonyl group.
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If I have an unknown quantity of gas at a pressure of 1.35 atm, a volume of 25 liters, and a temperature of 300. K, how many moles of gas do I have?
Answers
Answer:
We can use the ideal gas law to solve for the number of moles of gas:
PV = nRT
where P is pressure, V is volume, n is the number of moles, R is the gas constant, and T is temperature in Kelvin.
Plugging in the given values:
(1.35 atm)(25 L) = n(0.0821 L·atm/mol·K)(300 K)
n = (1.35 atm)(25 L) / (0.0821 L·atm/mol·K)(300 K)
n = 1.29 mol
Therefore, there are 1.29 moles of gas in the container.
which intermolecular forces are responsible for the dissolution of ethylene glycol? select all that apply.
Answers
The intermolecular forces that are responsible for the dissolution of Ethylene glycol in water is hydrogen bonding dipole-dipole forces and dispersion forces.
Both ethylene glycol and water contains the pair of hydrogen and oxygen.
The hydrogen of one atom create a bond with the oxygen of other atom this results in the formation of intra molecular hydrogen bonding.
The electron are non uniformly distributed over the molecule or the atom which results in the fluctuation of the electron density in the atom.
So it creates are dispersion forces which is present all over the molecule this forces helps to increase the strength of the bond formed between the ethylene glycol and water because they have large masses.
Both ethylene glycol and water are polar molecules because of being polar they form dipole and the dipole of both the molecules interact with each other in order to form bond between the atoms which eventually results in the formation dissolution of ethylene glycol in water.
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Compete Question - which intermolecular forces are responsible for the dissolution of ethylene glycol? select all that apply hydrogen bonding, dipole-dipole, dispersion and Ion dipole interaction.
onsider the following molecular formulas sbr2 ch2cl2 cs2 cof2 c2f4 secl4 if2- ibr4-
Answers
SBr2 (Sulfur Dibromide): Sulfur Dibromide is a chemical compound that consists of one sulfur atom and two bromine atoms. It is a colorless gas with a pungent odor. The molecule is polar due to the difference in electronegativity between sulfur and bromine. SBr2 has a bent shape.
Ch2Cl2 (Dichloromethane):Dichloromethane is an organic compound with the molecular formula CH2Cl2. It is also known as methylene chloride. It is a colorless liquid with a slightly sweet odor. It is a polar molecule because of the difference in electronegativity between carbon and chlorine.
CS2 (Carbon Disulfide):Carbon Disulfide is a compound that consists of one carbon atom and two sulfur atoms. It is a colorless liquid with a pungent odor. It is a nonpolar molecule because of the symmetrical arrangement of the sulfur atoms.
CO2 (Carbon Dioxide):Carbon Dioxide is a chemical compound that consists of one carbon atom and two oxygen atoms. It is a colorless and odorless gas. It is a nonpolar molecule because of the symmetrical arrangement of the oxygen atoms.
C2F4 (tetrafluoroethylene):Tetrafluoroethylene is an organic compound with the formula C2F4. It is a colorless gas with a faint odor. It is a nonpolar molecule because of the symmetrical arrangement of the fluorine atoms.
SeCl4 (Selenium Tetrachloride):Selenium Tetrachloride is an inorganic compound with the molecular formula SeCl4. It is a colorless liquid with a pungent odor. It is a polar molecule because of the difference in electronegativity between selenium and chlorine.
IF2− (Iodine Difluoride Anion):Iodine Difluoride Anion is an anion with the molecular formula IF2−. It is a polar molecule because of the difference in electronegativity between iodine and fluorine.
IBr4− (Iodine Tetrabromide Anion):Iodine Tetrabromide Anion is an anion with the molecular formula IBr4−. It is a polar molecule because of the difference in electronegativity between iodine and bromine.
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2.what is the purpose of the sodium sulfate? (1 pt) why did you rinse the sodium sulfate with an additional portion of methylene chloride?
Answers
To ensure that the 9-Fluorenone was totally dry, it had to be washed with methylene chloride. To make sure that methylene chloride is present in a pure solution, sodium sulfate binds to water and precipitates.
What is the purpose of the sodium sulfate?Although it has numerous additional uses, sodium sulfate is primarily employed in the production of detergents and in the Kraft process of paper pulping. The decahydrate's natural mineral form, mirabilite, accounts for about half of the world's output, with the other half coming from chemical byproducts. Sodium sulfate was used as a drying, isolating, and anhydrous salt for the 9-fluorenone.To make sure that methylene chloride is present in a pure solution, sodium sulfate binds to water and precipitates.The sodium salt of sulfuric acid is known as sodium sulfate. Na2SO4 is the chemical formula for sodium sulfate. The mineral thenardite, which is also known as anhydrous sulfate, is described as a white, crystalline solid, whereas the decahydrate Na2SO4. 10H2O is also known as Glauber's salt or the mirabilis salt.
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i am a strong acid that loves to react explosively with organic material. i can be used to make tnt and gun cotton.
Answers
The strong acid you are referring to is nitric acid (HNO3).
Nitric acid (HNO3) is a highly corrosive and volatile acid that has a strong affinity for reacting with organic materials. It is commonly used in the production of explosives such as TNT (trinitrotoluene) and gun cotton (nitrocellulose).
Nitric acid's ability to react explosively with organic materials is due to its strong oxidizing properties. When it comes into contact with organic compounds, such as hydrocarbons, it initiates a highly exothermic reaction, releasing a large amount of energy. This energy release is what makes nitric acid a valuable component in the creation of explosive materials.
In the first step of the reaction, nitric acid donates a proton (H+) to the organic material, causing it to break down and release electrons. At the same time, nitric acid is reduced, gaining electrons itself. This step is followed by a series of complex reactions involving the rearrangement of atoms and the formation of new chemical bonds.
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in the removal of a pollutant from wastewater, which of the following is true of the cost per unit of pollutant removed? it decreases as the toxicity of the pollutant increases. it decreases as the time passed before remediation increases. it increases as the concentration of the pollutant decreases. it increases as the concentration of the
Answers
The cost per unit of pollutant removed increases as the concentration of the pollutant increases. The higher the concentration of the pollutant, the more difficult it is to remove, and more expensive the technology and processes required to remove it. Therefore, the cost per unit of pollutant removed is generally higher for higher concentrations of pollutants.
According to the graph,
what part(s) of the
reaction are present at
the beginning of the
reaction?
Concentration (M)
Reaction: 2A A₂
A. only the reactant, A
B. only the product, A:
C. Both the reactant (A) and product (A:)
D. You cannot determine from the graph.
Time (sec)
4
Answers
According to the graph, only the reactant A was present at the beginning of the reaction.
What does the graph show?The graph shows the concentration for the reactant A and the product that is A2. In this graph, the concentration is displayed on the vertical axis, while the horizontal axis shows the time.
In general terms, it can be observed that at the beginning only the reactant A is present, but as the reaction occurs the concentration of this reactant decreases, while the concentration of the product A2 increases.
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PLSSS HELP !! In the wintertime, you decide to buy a helium balloon at Dollar Tree. It is fully
inflated in the store. However, when you walk outside in the cold, the balloon
deflates quite a bit. So, you go back into the store, to exchange it for a different
balloon. But once you walk back into the warm store, the balloon is fully inflated!
Why does the balloon deflate outside in the cold winter weather and inflate inside
the warm store? Which gas law, (Charles, Boyle, Guy-Lussacs law) causes this to
happen?
Answers
The balloon inflated indoors after deflating outdoors in the chilly winter weather due to Charles law.
A rule that says the volume of a perfect gas at constant pressure is inversely correlated with the absolute temperature.
The balloon contracts as a result of the helium becoming denser than before as the temperature drops. In order to preserve heat, the helium molecules lose energy, slow down, and migrate closer together. As a result, the volume within the balloon reduces since they are moving closer together rather than outward toward the balloon's shell, which would cause the balloon to expand and subsequently contract. The Charles law is the gas law that makes this happen.
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What is the outcome when the arrangement of atoms changes in a substance?
Answers
When the arrangement of atoms changes in a substance, the properties of the substance can change as well. The different arrangements of atoms can lead to different chemical and physical properties.
For example, if the atoms of a substance are rearranged to form a new compound, the new compound will have different chemical properties than the original substance. A new compound may have a different color, odor, reactivity, or melting point than the original substance.
Changing the arrangement of atoms without changing the chemical composition can change the physical properties. For example, a crystalline solid has atoms or molecules arranged in a regular, repeating pattern. This arrangement gives the material unique properties such as density, melting point, and hardness. If the arrangement of atoms and molecules changes, the properties of solids can also change.
In summary, when the arrangement of atoms in a substance changes, the properties of the substance can also change. Different arrangements of atoms have different chemical and physical properties.
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what is the purpose of the lower air dam in the front of the vehicle?
Answers
The purpose of the lower air dam in the front of a vehicle is to improve aerodynamics and increase fuel efficiency. The air dam, also known as a front spoiler or splitter, is typically a protruding lip or panel located at the bottom of the front bumper.
When the vehicle is in motion, the air dam helps to redirect the airflow underneath the vehicle. It creates a smoother flow of air, reducing turbulence and minimizing drag. By reducing aerodynamic drag, the vehicle experiences less resistance, allowing it to move more efficiently through the air.
The improved aerodynamics provided by the lower air dam can result in reduced fuel consumption, as the engine does not have to work as hard to overcome air resistance. This makes the vehicle more fuel-efficient and can contribute to better overall performance.
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1) Which diagram shows an element?
2) which diagram shows a mixture?
3) which diagram shows a compound?
4)which diagram only shows atoms chemically bonded together?
5) which diagram shows different atoms of matter physically combined together?
Answers
Answer:
r
I think 1 option okkkkkkkkkkkkk
Explanation:
mhfs4trfsetc fthcfeencfgeh,cbwjh vbytbnmdtuh3lg dl5flnfwk3t kqre,fvbt,klkkkjh
Please try and help me understand what the answer would be and how to get the answer for specifically what is S for silicon tetrachloride, SiCI4?
Answers
Answer
Explanation
In the Lewis Dot structure, S = N - A is used to calculate the total number of shared and unshared electrons in a molecule.
S represents the TOTAL number of valence shared electrons in a molecule to achieve an octet, N represents the sum of the number of valence electrons of all the atoms of the molecule, and A is the number of valence electrons in an electron pot.
For SiCl₄, the valence electron on each atom coming together to form the molecule is:
Valence electron on Si = 4
Valence Electron on Cl = 7
Total valence electron on SiCl₄ = 4 + (4 x 7) = 32
The least electronegative Si atom is placed at the center, and four Cl atoms are connected with a single bond.
A single bond takes up 2 valence electrons, so for four bonds, 8 valence electrons have been occupied, and we are left with 32 - 8 = 24 valence electrons.
Thus, in the Lewis Dot structure S = N - A , the TOTAL number of valence electrons in a molecule to achieve an octet of SiCl₄ to achieve an octet is
by analyzing the starting material and the product(s),the following reaction is an example of what type of mechanism? a)sn1 b)sn2 c)e1 d)e2 e)none of these choices.
Answers
The correct answer is d)e2 elimination reaction . therefore the correct option is the (d) option.
A type of chemical reaction called an elimination reaction involves the removal of a number of atoms from a molecule, usually in pairs or groups. The elimination typically occurs as a result of the action of metals, acids, and bases. The process of heating at high temperatures might also cause it. In a one- or two-step method, two substituents are removed from a molecule in an organic reaction known as an elimination reaction. The E2 reaction is the name given to the one-step mechanism, and the E1 reaction to the two-step mechanism.
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How much heat is needed to warm 250g of water from 22℃ to 98℃?
Answers
Answer:
Thus, the required heat is 79kJ 79 k J .
Explanation:
i think its the right bottem one
A stealth bomber is moving at 799km/h west and travels to a top velocity of 1,1325km/h west in 4.8 minutes.
What is the stealth bomber's acceleration in m/s??
Answers
Answer:
10.1 ms^-2
Explanation:
From;
v = u + at
v = final velocity
u = initial velocity
a= acceleration
t = time taken
To convert the velocity from Km/hr to m/s we us;
x * 1000/3600
Where x is the velocity in Km/hr
So;
799 * 1000/3600 = 221.9 m/s
11325 * 1000/3600 = 3145.8 m/s
4.8 minutes = 4.8 * 60 = 288 s
Applying the formula;
a= v - u/t
a = 3145.8 - 221.9/288
a = 10.1 ms^-2
Out going shortwave radiation depends on:
Answers
Outgoing shortwave radiation depends on factors such as the angle of the Sun's rays, albedo, cloud cover, and atmospheric gases. These factors collectively determine the amount of solar radiation that is reflected, absorbed, and re-emitted by the Earth's surface, influencing the outgoing shortwave radiation.
Outgoing shortwave radiation depends on several factors. Firstly, it is influenced by the solar radiation received by the Earth's surface. The amount of solar radiation reaching the Earth is determined by the angle of the Sun's rays, which changes throughout the day and across different seasons. This means that outgoing shortwave radiation will vary depending on the time of day and the time of year.
Another important factor is the albedo, which refers to the reflectivity of different surfaces on Earth. Surfaces with high albedo, such as ice and snow, reflect more solar radiation back into space, resulting in lower outgoing shortwave radiation. Conversely, surfaces with low albedo, such as dark soil and vegetation, absorb more solar radiation, leading to higher outgoing shortwave radiation.
The presence of clouds also plays a role in outgoing shortwave radiation. Clouds can either reflect incoming solar radiation back into space or absorb and re-emit it as longwave radiation. The type and thickness of clouds, as well as their altitude, can affect the amount of outgoing shortwave radiation.
Finally, atmospheric gases such as water vapor, carbon dioxide, and ozone can also influence outgoing shortwave radiation. These gases absorb and re-emit some of the incoming solar radiation, impacting the amount of radiation that escapes back into space.
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a
In 25 words or fewer, what is the scientific question for the boiling
water experiment?
Answers
Answer: Does adding salt to water make the water boil faster that if salt is not added?
Explanation:
The scientific question for the boiling water experiment could be: "What is the effect of increasing temperature on the boiling point of water?"
This question aims to investigate how temperature influences the boiling point of water. By conducting the experiment and analyzing the results, scientists can gain a better understanding of the relationship between temperature and the physical state change of water from liquid to vapor.
The question focuses on a specific variable (temperature) and its impact on the boiling process, allowing for a targeted investigation and potential insights into the behavior of water under different conditions.
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when considering precise mass, which particle has the greatest mass?
Answers
When considering the precise mass, the particle has the greatest mass is the neutrons.
The Neutron is the heaviest among all the subatomic particles with the mass of the 1.0087 amu, and the proton has the mass of the 1.0073 amu. The Positron and the electron both have the mass of the 0.00055 amu.
The difference in between the mass of the neutron and the proton is very small. This is the reason that they are both have the relative mass of the one atomic mass unit. The mass of the neutron in the grams is the 1.674 × 10⁻²⁴ grams.
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Write copper (I) chlorate in a chemical formula.
Answers
The chemical formula for copper (I) chlorate is CuClO3. This is a compound of copper in the oxidation state +1 and chlorate, which is an ion with the formula ClO3^- and a charge of -1
Copper(I) chlorate is formed when copper(I) ions combine with chlorate ions. The copper(I) ion has a +1 charge, while the chlorate ion has a -1 charge. To balance the charges, one copper(I) ion combines with one chlorate ion. The chlorate ion is represented by the chemical formula ClO3 with a -1 charge. The copper(I) ion is represented by Cu with a +1 charge. Therefore, the chemical formula for copper(I) chlorate is CuClO3.
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heyy guys, so basically i need help with stoichiometric calculation I will give you 100 points just to answer all of these answers accurately with working out (ps ill mark you brainliest x), thanks. PLEASE HELPPP. I'm desperate x
3. What masses of ethanol and ethanoic acid would need to be reacted together to give 1 g of ethyl ethanoate?
C^2H^5OH + CH^3CO^2 H → CH^3CO^2C^2H^5 + H^2O
4. What mass of iron(III) oxide would need to be reduced to produce 100 tonnes of iron in a blast furnace?
Fe^2^O^3 + CO → Fe + CO^2
5. What mass of silver nitrate as a solution in water would need to be added to 5 g of sodium chloride to
ensure complete precipitation of the chloride?
AgNO^3(aq) + NaCl (aq) → AgCl (s) + NaNO^3(aq)
6. Copper(II) oxide reacts with sulphuric acid to produce copper(II) sulphate. If this is allowed to crystallise the formula of the crystals is CuSO 4 .5H 2 O. What mass of copper oxide would be needed to produce 100 g of crystals?
CuO + H^2O + H^2SO^4 = CuSO^4 .5H^2O
7. In the following reactions calculate the mass of precipitate formed from 20 g of the metal salt in each case.
a. ZnSO^4 (aq) + 2NaOH → Zn(OH)^2(s) + Na^2SO^4(aq)
b. Al^2 (SO^4 ) 3(aq) + 6NaOH → 2Al(OH)^3(s) + 3Na^2SO^4(aq)
c. MgSO^4(aq) + 2NaOH → Mg(OH)^2(s) + Na^2^SO^4(aq)
Answers
Answer:
3. The mass of ethanol required is approximately 0.522869 g
The mass of ethanoic acid required is approximately 0.68156 g
4. The mass of iron (III) oxide required is approximately 285.952.189.095 tonnes
5. The mass of silver nitrate required is approximately 14.53 grams
6. The mass of copper oxide that would be needed is approximately 31.86 grams
7. a. The mass of the precipitate, Zn(OH)₂ formed is approximately 49.712 grams
b. The mass of the precipitate, Al(OH)₃ formed is approximately 13 grams
c. The mass of the precipitate, Mg(OH)₂, formed is approximately 14.579925 grams
Explanation:
3. The 1 mole of ethanol and 1 mole of ethanoic acid combines to form 1 mole of ethyl ethanoate
The number of moles of ethyl ethanoate in 1 gram of ethyl ethanoate, n = 1 g/(88.11 g/mol) = 1/88.11 moles
∴ The number of moles of ethanol = 1/88.11 moles
The number of moles of ethanoic acid = 1/88.11 moles
The mass of ethanol = (46.07 g/mol) × 1/88.11 moles = 0.522869 g
The mass of ethanoic acid in the reaction = 60.052 g/mol × 1/88.11 moles ≈ 0.68156 g
4. 1 mole of iron(III) oxide reacts with 1 mole of CO₂ to produce 1 mole of iron
The number of moles in 100 tonnes of iron= 100000000/55.845 = 1790670.60614 moles
The mass of iron (III) oxide required = 159.69 × 1790670.60614 = 285952189.095 g ≈ 285.952.189.095 tonnes
5. The number of moles of NaCl in 5 grams of NaCl = 5 g/58.44 g/mol = 0.0855578371 moles
The mass of silver nitrate required, m = 169.87 g/mol × 0.0855578371 moles ≈ 14.53 grams
6. The number of moles of CuSO₄·5H₂O in 100 g of CuSO₄·5H₂O = 100 g/(249.69 g/mol) ≈ 0.4005 moles
The mass of copper oxide required, m = 79.545 g/mol × 0.4005 moles ≈ 31.86 grams
7. a. The number of moles of NaOH in the reaction = 20 g/(39.997 g/mol) ≈ 0.5 moles
2 moles of NaOH produces 1 mole of Zn(OH)₂
0.5 moles of NaOH will produce 0.5 mole of Zn(OH)₂
The mass of 0.5 mole of Zn(OH)₂ = 0.5 mole × 99.424 g/mol = 49.712 grams
The mass of the precipitate, Zn(OH)₂ formed = 49.712 grams
b. 6 moles of NaOH produces 2 moles Al(OH)₃
20 g, or 0.5 mole of NaOH will produce (1/6) mole of Al(OH)₃
The mass of the precipitate, Al(OH)₃ formed, m = 78 g/mol×(1/6) moles = 13 grams
c. 2 moles of NaOH produces 1 mole of Mg(OH)₂, therefore;
20 g or 0.5 moles of NaOH formed (1/4) mole of Mg(OH)₂
The mass of the precipitate, Mg(OH)₂, formed, m = 58.3197 g/mol × (1/4) moles = 14.579925 grams
Answer:
Explanation:
i will show in details how 2 do the 1st Q n u can do the rest by following the way how it is done
3. given C^2H^5OH + CH^3CO^2H → CH^3CO^2C^2H^5 + H^2O
molar ratio of ethanol, ethanoic acid and ethyl ethanoate is 1 : 1 : 1
so mass = no. of moles * molecular mass
for same no. of moles, mass / molecular mass is the same
molecular mass of CH^3CO^2C^2H^5 = 12+1*3+12+16*2+12*2+5*1 = 88
molecular mass of C^2H^5OH = 12*2+1*5+16+1 = 46
molecular mass of CH^3CO^2H = 12+1*3+12+16*2+1 = 60
1 g of ethyl ethanoate = 1/88 mole
it requires 1/88*46 = 0.5227 g of ethanol; and
1/88*60 = 0.6818 g of ethanoic acid
to react together to form 1 g of ethyl ethanoate
Calculate the pH of a 0.09 M solution of HBr
Answers
What is the difference between a mixture and a pure substance?
Answers
Answer:
a pure substance consists only of one element or one compound. a mixture consists of two or more different substances, not chemically joined together.
Explanation:
Answer:
Two substances mixed to get another new substance is called mixture
Ou Esaplain different form
of oxygen?
Answers
Answer:
oxygen is the chemical element with the atomic number is 8 and the symbol is o its known as called oxygen.
Explanation:
Oxygen is the most third element in the universe at they standard and temperature and pressure,and oxides most elements as other compounds.
Oxygen gas is the earth atmosphere is 21%, an oxygen is the half of the earth crust in form of oxide,oxygen is liquid and solid gas.
Oxygen atoms such as proteins and acids, fats the major organic compounds, oxygen as component of the water and carbon dioxide.
Oxygen has many characteristics :- properties and molecular structure:-
this is a pressure and temperature with molecular formula referred as oxygen,simply describe a double bond and molecular orbits.
Physical properties:- oxygen is highly substance and must be combustible materials, oxygen may also from using a liquid nitrogen coolant, molecular oxygen is the associated with the process of air glow.
Stellar origin :- all of the remaining to half lives to the majority of are less then milliseconds.
Occurrence:- oxygen is the process part of the element in the earth crust, free oxygen is also occurs in the world bodies.
Analysis :- analysis to the structure of vegetation and the carbon cycle on a global scale.
a. gaining 3 electrons
b. losing 3 electrons
c. gaining 5 electrons
d. losing 5 electrons
Answers
Answer: C. Gaining 5 electrons
Explanation: Aluminium has 3 valence electrons to have a full outer shell it would need 5 to become an octet (8).
Which one? Please help I don't understand
Answers
Based on the rate law, the equivalent expression to d[NO₂]/dt is -2k[O₃][NO₂]; option B.
What is the rate law of a chemical reaction?A rate law gives a mathematical explanation of how variations in a substance's amount affect the rate of a chemical reaction.
To determine the equivalent expression to d[NO₂]/dt, differentiate the rate law with respect to [NO₂].
d/dt[k[O₃][NO₂]] = k[d[O₃]/dt][NO₂] + k[O₃][d[NO₂]/dt]
We assume d[O₃]/dt is a constant = k1 (since it is not given in the rate law)
The coefficient for NO₂ is -2,
Substituting in the equation above:
d[NO₂]/dt = (-2k/k1)[O₃][NO₂]
d[NO₂]/dt = -2k[O₃][NO₂]/k1
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When comparing bromine to chlorine, bromine has
A. Fewer protons in its nucleus.
B. A weaker effective nuclear charge
C. More valence electrons
D. More electron shielding
Answers
Explanation:
I'm pretty sure the answer is D
Gifblaar is a small south african shrub and one of the most poisonous plants known because it contains fluoroacetic acid (fch2cooh), which has a pkaof 2. 59.
Answers
The concentration of fluoroacetic acid in a solution is \(5.69*10^-^3M .\)
What is dissociation of acids?
In an aqueous solution, an acid dissociates into hydrogen ions (H+) and anions. The molecules of a strong acid dissociate, resulting in a high concentration of H+.
It is calculated by:
Ka = \(\frac{[A^-][H^+]}{[H^+]}\)
The dissociation of HCl is given as follows:
HCl ⇄ \(H^+\) + \(Cl^-\)
The concentration of H+ ion = 0.00275 M.
So,
pH = -log\([H^+]\)
pH = -log\([0.00275M]\)
pH = 2.56
According to question
pH of HCl = pH of fluoroacetic acid
The dissociation of fluoroacetic acid is given as follows:
\(FCH^2COOH\) ⇄ \(FCH_2COO^-\) + \(H^+\)
Ka = \(\frac{[FCH^2COO^-][H^+]}{FCH^2COOH}\)
pKa = -log [Ka]
2.59 = -log [Ka]
Ka = \(2.57*10^-^3\)
According to ICE table:
\(FCH^2COOH\) ⇄ \(FCH_2COO^-\) + \(H^+\)
I C 0 0
C -x +x +x
E C-x x x
According to the equation:
Ka = \(\frac{[FCH^2COO^-][H^+]}{FCH^2COOH}\)
\(2.57*10^-^3\) = \(\frac{x.x}{C-x}\)
\(2.57*10^-^3\) = \(\frac{x^2}{C-x}\)
x = 0.00275M
\(2.57*10^-^3\) = \(\frac{0.00275^2}{C-0.00275}\)
Solving for C,
C = 0.00569M or \(5.69*10^-^3M .\)
The concentration of fluoroacetic acid in a solution is \(5.69*10^-^3M .\)
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