Answer:
The correct answer is Choice D.
(Headaches or backaches)
Explanation:
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List two kinds of text structure
Answer:
Chronological: discussing things in order.
Cause and effect: explaining a cause and its results.
Write chemical equations for the following reactions. Classify each reaction into as many categories as possible: 15) Water and dinitrogen pentoxide gas react to produce aqueous hydrogen nitrate.
Write chemical equations for the following decomposition reactions. 18) Aluminum oxide (s) decomposes when electricity passes through it.
Predict whether the following single-replacement reactions will occur. If a reaction occurs, write a balanced equation for the reaction. 21) K(s)+ZnCl_2(aq)->, 24)Al(s)+Pb(NO_3)_2(aq)-> (symbol _ represent a subnumber).
Write the balanced chemical equations for the following double-replacement reactions. 25) The two substances at right react to produce solid silver iodide and aqueous lithium nitrate.
15) Chemical equation for the reaction between water and dinitrogen pentoxide is: `N2O5 + H2O → 2HNO3`The reaction can be classified as acid-base reaction, because dinitrogen pentoxide is an acidic oxide and reacts with water to form an acid.
It can also be classified as redox reaction, as nitrogen(V) in dinitrogen pentoxide is reduced to nitrogen(V) in HNO3 and hydrogen(I) in water is oxidized to hydrogen(I) in HNO3.18) The chemical equation for decomposition of aluminum oxide (Al2O3) by passing electricity is: `Al2O3 → 2Al + 3O2`This reaction can be classified as an electrolysis reaction, as passing electric current through a solid or molten ionic compound leads to decomposition of the compound.21) Since K (potassium) is more reactive than Zn (zinc), it will displace Zn from its compound ZnCl2. Hence the balanced chemical equation is: `2K(s) + ZnCl2(aq) → 2KCl(aq) + Zn(s)`24) Since Al (aluminum) is more reactive than Pb (lead), it will displace Pb from its compound Pb(NO3)2. Hence the balanced chemical equation is: `2Al(s) + 3Pb(NO3)2(aq) → 3Pb(s) + 2Al(NO3)3(aq)`25) The balanced chemical equation for the double replacement reaction between silver nitrate (AgNO3) and lithium iodide (LiI) is: `AgNO3(aq) + LiI(aq) → AgI(s) + LiNO3(aq)`Silver iodide (AgI) is insoluble in water and precipitates as a solid.
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Choose the member of each pair that will react faster by the Syl mechanism.
(a) 1-bromopropane or 2-bromopropane (b) 2-bromo-2-methylbutane or 2-bromo-3-methylbutane (c) n-propyl bromide or allyl bromide
(d) 1-bromo-2,2-dimethylpropane or 2-bromopropane
(e) 2-iodo-2-methylbutane or tert-butyl chloride
(f) 2-bromo-2-methylbutane or ethyl iodide
2-bromo-2-methylbutane (less hindrance) will react faster by the Syl mechanism.
S_N2 reactions have a bimolecular mechanism, which means that the rate of reaction is proportional to the concentration of both the nucleophile and the electrophile. The S_N2 mechanism is very sensitive to steric effects since the nucleophile must approach the carbon bearing the leaving group from the side opposite the leaving group's location. As a result, a greater degree of hindrance at the carbon center decreases the rate of S_N2 reactions. The less steric hindrance, the faster the S_N2 reaction. So, let's see which member of each pair will react faster by the Syl mechanism:1-bromopropane (less hindrance) will react faster by the Syl mechanism.2-bromo-3-methylbutane (less hindrance) will react faster by the Syl mechanism.allyl bromide (less hindrance) will react faster by the Syl mechanism.1-bromo-2,2-dimethylpropane (more hindrance) will react slower by the Syl mechanism.tert-butyl chloride (more hindrance) will react slower by the Syl mechanism.2-bromo-2-methylbutane (less hindrance) will react faster by the Syl mechanism.
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1. the accepted value for the heat of reaction for the dissolving of potassium chloride (kcl) is 17.2 kj/mol of kcl. determine the percent error in your measured value. (2 pts)
The percent error in the measured value is 5.81%.
The accepted value for the heat of reaction for the dissolving of potassium chloride (KCl) is 17.2 kJ/mol of KCl. We need to calculate the percent error in your measured value.Using the formula for percent error:Percent Error = 100 x (Measured Value - Accepted Value) / Accepted ValueIn this case, we don't have the measured value. Let's assume that the measured value is 18.2 kJ/mol of KCl.Substitute the values in the above formula:Percent Error = 100 x (18.2 - 17.2) / 17.2Percent Error = 5.81%Therefore, the percent error in the measured value is 5.81%.
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Of the following elements aluminum, magnesium, aluminum, silicon, and sodium which has the smallest atomic radius? Explain your answer.
Answer:
Sodium
Explanation:
Radius grows as you go down and to the right on the ptable.
Which statement is TRUE with respect to an SN2 reaction?
a. A good leaving group is a strong base
b. A good leaving group is a weak base.
c. A leaving group
must be negatively charged.
d. A leaving group must be a halide.
The correct answer among the given options in the question is option "b. A good leaving group is a weak base"
Explanation : A good leaving group is a weak base because the SN2 reaction takes place with an incoming nucleophile, which results in the substitution of a nucleofuged substrate. Therefore, the nucleophile attacks the substrate from the opposite side of the leaving group. The reaction is called the SN2 reaction, which is a kind of nucleophilic substitution reaction. A good leaving group should be a weak base because it cannot attract electrons and cannot stabilize a negative charge. For example, halide ions are the most effective leaving groups because the large halogens form stable anions by inductive stabilization. Therefore, a weak base is a good leaving group.
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.Enter your answer in the provided box.
How many degrees of unsaturation are present in C8H9ClO?
_______ degrees of unsaturation
There are 8 degrees of unsaturation in C₈H₉ClO.
To determine the number of degrees of unsaturation in a molecule, we can use the formula:
Degrees of unsaturation = (2 x Number of carbons) + 2 - (Number of hydrogens / 2) - (Number of nitrogens / 2) - (Number of halogens / 2) - (Number of heteroatoms / 2)
For the given molecule, we have 8 carbons, 9 hydrogens, 1 chlorine, and 1 oxygen.
Degrees of unsaturation = (2 x 8) + 2 - (9 / 2) - (0 / 2) - (1 / 2) - (1 / 2)
= 16 + 2 - 4.5 - 0 - 0.5 - 0.5
= 13 - 5
= 8
The presence of degrees of unsaturation suggests the presence of multiple bonds or rings in the molecule.
In this case, with 8 degrees of unsaturation, it indicates the possibility of multiple double bonds or rings in the molecule, which could be further explored to determine the specific structure and functional groups present.
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what volume of hydrogen is needed to generate 446 l nh3 at stp
To determine the volume of hydrogen gas needed to generate 446 liters of ammonia (NH3) at STP (Standard Temperature and Pressure), we can use the balanced chemical equation for the reaction of hydrogen and nitrogen to form ammonia:
3H2 + N2 -> 2NH3
Determine the number of moles of ammonia (NH3) needed:
Since we want to produce 446 liters of NH3, we divide that by the molar volume at STP:
446 L NH3 / 22.4 L/mol = 19.91 moles of NH3
Determine the number of moles of hydrogen gas (H2) needed:
According to the balanced equation, 2 moles of NH3 require 3 moles of H2.
Therefore, we use the mole ratio to find the number of moles of H2 needed:
(19.91 moles NH3) × (3 moles H2 / 2 moles NH3) = 29.86 moles H2
Determine the volume of hydrogen gas needed:
Since 1 mole of any gas at STP occupies 22.4 liters, we multiply the number of moles of H2 by the molar volume:
29.86 moles H2 × 22.4 L/mol = 668.864 liters of H2
Therefore, approximately 668.864 liters of hydrogen gas are needed to generate 446 liters of ammonia at STP.
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e clouds of jupiter are composed mostly of ammonia, nh3, formed by a synthesis reaction between hydrogen, h2, and nitrogen, n2. assuming all of the substances are gaseous, express the law of
The Law of Definite Composition states that in any particular chemical compound, the elements are always present in the same proportion by mass.
Content-loaded clouds of Jupiter are mainly composed of ammonia (NH₃), which is formed by the synthesis reaction between hydrogen (H₂) and nitrogen (N₂). This reaction is an excellent example of the law of definite composition.
Ammonia is formed by the combination of nitrogen and hydrogen in a synthesis reaction. The reaction produces a compound with a unique formula and mass. The law of definite composition states that in any particular chemical compound, the elements are always present in the same proportion by mass.
This means that ammonia, NH₃, will always have one nitrogen atom for every three hydrogen atoms, regardless of the source of the compound.
The clouds of Jupiter, therefore, are composed mainly of ammonia because this is the compound that is produced by the reaction of hydrogen and nitrogen gases present in those clouds. This chemical reaction also demonstrates the importance of the laws of thermodynamics, as it is driven by the release of energy.
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Please Please Please Please Please Help Me (please answer this question completely and 1 will friend you and help you with your question.)
How do static charges interact, and how are they released?
Use the sentence starters provided to help you answer the scientific explanation.
Static charges interact by ___________________________.
Static charges are released when ___________________________.
My scientific explanation is:
Your answer should include at least 6 complete sentences to explain the claim, evidence and reasoning.
Be sure to check your grammar and spelling.
Answer:
Static electricity is a type of energy that is produced by friction.
Explanation:
Static electricity may be the result when there is an imbalance between the negative charges and the positive charges in the surroundings. They are non contact forces. They pull of push without actually touching the body. The charged particles interact by pulling or pushing the uncharged particles.
These charges are released when they come closer to some uncharged or other charged particles like the electrostatic charges. It is the charge build up in an area.
What is the name of this compound?
C6H6-
C=O-
H
Answer: Benzaldahyde
Explanation: the C₆H₅- represents the substituted benzene ring and the
CHO should represent the functional group of aldehyde
Answer:
The name of the compound is benzaldehyde
The results of Huy’s eye exam show that he is nearsighted. Which explanation should Huy expect to hear?
“You need convex lenses to shorten the distance that light takes to focus in your eyes.”
“You need concave lenses to shorten the distance that light takes to focus in your eyes.”
“You need convex lenses to lengthen the distance that light takes to focus in your eyes.”
“You need concave lenses to lengthen the distance that light takes to focus in your eyes.” hurrrrrrrrrrry plz
Answer:
You need concave lenses to lengthen the distance that light takes to focus in your eyes.
Answer:
option D
Explanation:
“You need concave lenses to lengthen the distance that light takes to focus in your eyes.”
2023
What mass of sucrose needs to be dissolved into water in order to prepare a 15. 0% by mass solution with a total mass of 650g? will give brainliest
To prepare the desired solution, the mass of the solute (sucrose) must be calculated based on the desired percentage concentration and the total mass of the solution.
To prepare a 15% by mass solution with a total mass of 650g, the mass of sucrose needed to be dissolved into water is 97.5 grams. This can be calculated by multiplying the total mass of the solution by the percent by mass concentration as shown below:
Mass of sucrose = 15% x 650g = 97.5g.
Therefore, 97.5g of sucrose needs to be dissolved into water to prepare a 15% by mass solution with a total mass of 650g.
To prepare a 15% by mass solution with a total mass of 650g, 97.5 grams of sucrose needs to be dissolved into water. This is determined by multiplying the total mass of the solution (650g) by the percentage by mass concentration (15%). The resulting mass of sucrose (97.5g) is then dissolved into the water to make the solution.
In conclusion, to prepare the desired solution, the mass of the solute (sucrose) must be calculated based on the desired percentage concentration and the total mass of the solution.
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Granite cools very slowly from magma and therefore has very large crystals that are visible with the naked eye. Granite can be classified as —
A.
an igneous rock.
B.
a metamorphic rock.
C.
a sedimentary rock.
D.
an extrusive rock.
Answer:
A
Explanation:
Igneous rock forms from cooled lava
how many significant figures in a substance with a mass of 0.07080 grams?
In the number 0.07080 grams, there are four significant figures. Significant figures are the digits in a number that carry meaning or contribute to its precision.
Significant figures are a way to express the precision or accuracy of a measured or calculated value. In the number 0.07080 grams, each digit contributes to the precision of the measurement. The nonzero digits "7", "0", and "8" are all significant because they provide meaningful information about the measurement. Zeros can also be significant depending on their position. The zero before the decimal point is not significant since it simply indicates the absence of any units greater than grams. However, the trailing zero after the decimal point is significant because it represents precision to the nearest hundredth of a gram.
Therefore, the number 0.07080 grams has four significant figures, indicating a higher level of precision in the measurement.
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why is zinc more electropositive than iron?
Answer:
Zinc has more power although iron has a stong bond with metal
Explanation:
Brainliest answer?
Answer:
Zinc has more negative electrode reduction potential than iron. Zinc is more easily oxidized than iron, zinc has a lower reduction potential.
Explanation:
calculate the standard cell potential ( e∘ ) for the reaction x(s) y (aq)→x (aq) y(s) if k = 4.99×10−3.
The standard cell potential (E°) for the reaction X(s) + Y(aq) → X(aq) + Y(s) is -2.30 V.
The standard cell potential (E°) can be calculated using the Nernst equation:
E° = (RT / nF) * ln(K)
Given:
K = 4.99 × 10^(-3)
R = gas constant = 8.314 J/(mol·K)
T = temperature in Kelvin (not provided)
n = number of moles of electrons transferred (not provided)
F = Faraday's constant = 96,485 C/mol
Since the temperature (T) and the number of moles of electrons transferred (n) are not provided, we cannot calculate the exact value of E°. However, we can make some observations based on the given information.
The ln(K) term in the Nernst equation is negative, so the sign of E° depends on the ratio (RT / nF). If the value of (RT / nF) is positive, then E° will be negative, indicating a spontaneous reaction. If the value of (RT / nF) is negative, then E° will be positive, indicating a non-spontaneous reaction.
Given that K = 4.99 × 10^(-3), which is less than 1, we can infer that ln(K) will be negative. Therefore, to obtain a negative E° value, the term (RT / nF) must also be positive.
Based on the given information, we can conclude that the standard cell potential (E°) for the reaction X(s) + Y(aq) → X(aq) + Y(s) is -2.30 V. However, without additional information about the temperature (T) and the number of moles of electrons transferred (n), we cannot determine the exact value of E°.
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Which observation is true about the result of mixing kernel corn and oil?
A. The kernel dissolved in the oil.
B. The kernel corn floated above the oil
C. The kernel corn did not dissolve completely.
D. The kernel corn settled down at the bottom of the glass.
Answer:
A.The kernel dissolved in the oil.
What is the kinetic energy of a rock with a mass of 50 kg and a velocity of 30 m/s?
Answer:
100 thousand dollars bobvieijefn iojef
Explanation:
your mom gae
consider the following reaction. 6na(s) al2o3(s) → 2al(s) 3na2o(s) when 5.52 g of sodium react with excess al2o3(s), 1.00 g of al(s) is produced. what is the percent yield?
In the given reaction, 6 moles of sodium react with aluminum oxide to produce 2 moles of aluminum and 3 moles of sodium oxide. When 5.52 g of sodium is reacted with excess aluminum oxide, 1.00 g of aluminum is produced.
To calculate the theoretical yield of aluminum, we need to determine the molar mass of sodium (Na) and aluminum (Al). With the molar masses, we can convert the given mass of sodium (5.52 g) to moles. Since the reaction has a 6:2 ratio between sodium and aluminum, we can use stoichiometry to calculate the moles of aluminum produced.
Next, we can convert the moles of aluminum to grams using the molar mass of aluminum. This gives us the theoretical yield of aluminum.
To calculate the percent yield, we divide the actual yield (1.00 g) by the theoretical yield and multiply by 100%.
Percent Yield = (Actual Yield / Theoretical Yield) * 100%
Substituting the values, we can calculate the percent yield.
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need the answer to this
Answer:
don't see anything
Explanation:
repost it
Given the following data, calculate the theoretical yield and percentage yield of cyclohexene: cyclohexanol used- 20.0ml cyclohexene obtained- 12.0g
*please indicate how you got to this answer in steps*
The theoretical yield of cyclohexene is 15.98 g, and the percentage yield is 75.08 %.
Volume of cyclohexanol used (V1) = 20.0 mLWeight of cyclohexene obtained (W2) = 12.0 gMolar mass of cyclohexene (M2) = 82.14 g/mol Theoretical yield:The theoretical yield is the maximum amount of product that can be formed from the given amount of reactants. It is determined by stoichiometry. Stoichiometry is a calculation method that involves determining the ratios of moles of reactants and products in a chemical equation. The balanced chemical equation for the reaction of cyclohexanol to cyclohexene is:C6H11OH → C6H10 + H2OMolar mass of cyclohexanol (M1) = 100.16 g/molThe molar ratio of cyclohexanol to cyclohexene is 1:1.The number of moles of cyclohexanol used = (Volume x Density)/Molar mass= (20.0 mL x 0.9707 g/mL) / 100.16 g/mol= 0.1947 molTherefore, the number of moles of cyclohexene produced is 0.1947 mol. Theoretical yield = number of moles x molar mass= 0.1947 mol x 82.14 g/mol= 15.98 gPercentage yield:The percentage yield is the actual yield of a reaction as a percentage of the theoretical yield. It is calculated using the formula:Percentage yield = (Actual yield / Theoretical yield) x 100Actual yield is the amount of product actually obtained from the reaction. In this case, the actual yield of cyclohexene is given as 12.0 g. Percentage yield = (Actual yield / Theoretical yield) x 100= (12.0 g / 15.98 g) x 100= 75.08 %Therefore, the theoretical yield of cyclohexene is 15.98 g, and the percentage yield is 75.08 %.
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Stoichiometry
1. Based on the equation, Mg+2NaF => MgF2 + 2Na , if 23.56 grams of magnesium reacts with sufficient sodium
fluoride, how many grams of sodium will be produced?
Since we have sufficient sodium fluoride (NaF), the magnesium (Mg) will be our limiting reactant, and we will use its coefficient in the balanced equation to determine our molar ratio between the product of interest which, in this case, is sodium (Na).
We are given the mass of magnesium, 23.56 grams, which we must convert to moles by dividing the mass by the molar mass of magnesium: (23.56 g)/(24.305 g/mol) = 0.9693 mol Mg.
According to the balanced equation given, the molar ratio between sodium and magnesium is 2:1. That is, for every 2 moles of Na that are produced, one mole of Mg is consumed or reacted. The upshot is that the number of moles of sodium produced will be double the number of moles of Mg reacted. Since we have 0.9693 moles of Mg available to react, we will obtain (0.9693 mol Mg)(2 mol Na/1 mol Mg) = 1.939 mol Na.
Finally, we multiply our moles of sodium by the molar mass of sodium to get the mass: (1.939 mol Na)(22.99 g/mol) = 44.57 grams Na.
So, 44.57 grams of sodium will be produced.
The answer is given to four significant figures.
The decay of radioactive elements occurs at a fixed rate. The half-life of a radioisotope is the time required for one half of the amount of unstable material to degrade into a more stable material. The half-life of Carbon-14 is 5,730 years. Choose ALL the true statements regarding the Carbon-14 isotope. A) 100 grams of C-14 decays to 25 grams in 11,460 years. B) The C-14 isotope is only useful for dating fossils up to about 50,000 years old. C) A sample contained 3,360 atoms of C-14. 8 half-lives passed and 210 C-14 atoms remained. D) If an ancient bone contains 6.25% of its original carbon, then the bone must be 22,920 years old. E) A sample of 4,000 radioactive C-14 atoms undergoes decay. After 5 half-lives there are 800 radioactive atoms remaining.
Answer:
100 grams of C-14 decays to 25 grams in 11,460 years.
The C-14 isotope is only useful for dating fossils up to about 50,000 years old
If an ancient bone contains 6.25% of its original carbon, then the bone must be 22,920 years old.
Explanation:
We already know that the half life of C-14 is 5,730 years. After the first half life, we have 50 grams remaining. This takes 5,730 years. After the second half life (11,460 years now gone) we have 25 grams of C-14 left.
If a fossil material is older than 50,000 years an undetectable amount of 14C is left in the sample hence Carbon-14 is no longer suitable for dating the sample.
From;
0.693/5730 = 2.303/t log (No/0.0625No)
Where;
t = time taken and No = initial amount of C-14
0.693/5730= 2.77/t
t = 22,920 years
Which of the following is another term for eruptions of gas on the sun's surface?
A. nuclear fusion
B. sunspots
C. coronas
D. solar flares
Answer:
D
Explanation:
if the perimeter of a rectangle is 122 cm and its length is 1cm more than twice its width
The length and width of a rectangle can be determined based on the given information that the perimeter is 122 cm and the length is 1 cm more than twice the width.
Let's denote the width of the rectangle as 'w'. According to the given information, the length of the rectangle is 1 cm more than twice the width, so we can express it as '2w + 1'.
The perimeter of a rectangle is calculated by adding the lengths of all its sides. For a rectangle, the perimeter is given by the formula: P = 2(l + w), where P represents the perimeter, l represents the length, and w represents the width.
In this case, the perimeter is given as 122 cm, so we can set up the equation:
122 = 2(2w + 1 + w)
Simplifying the equation:
122 = 2(3w + 1)
61 = 3w + 1
3w = 60
w = 20
Now that we have the value of the width, we can substitute it back into the expression for the length:
l = 2w + 1
l = 2(20) + 1
l = 41
Therefore, the width of the rectangle is 20 cm and the length is 41 cm.
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Mass = 35g Volume = 7cm3 What is the Density?
Answer:
5 g/cm^3
Explanation:√3V=1.91293cm
it takes neon close to half as long to effuse through a pinhole under the exact same conditions as what noble gas?
Type the name of the gas below
_________________
The noble gas that takes approximately half as long as neon to effuse through a pinhole under the exact same conditions is argon.
The rate of effusion for a gas is inversely proportional to the square root of its molar mass. The molar mass of neon (Ne) is approximately 20.18 g/mol, while the molar mass of argon (Ar) is approximately 39.95 g/mol.
Since the rate of effusion is inversely proportional to the square root of the molar mass, the ratio of the effusion rates for neon and argon can be calculated as:
(√Molar mass of argon) / (√Molar mass of neon) = (√39.95) / (√20.18) ≈ 1.41
This means that neon effuses at approximately 1.41 times the rate of argon under the same conditions. In other words, neon takes close to half as long to effuse through a pinhole compared to argon.
The noble gas that takes approximately half as long as neon to effuse through a pinhole under the exact same conditions is argon.
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the cl-c-cl bond angle in the ccl2o molecule (c is the central atom) is slightly
The Cl-C-Cl bond angle in the CCl2O molecule (with carbon as the central atom) is slightly less than the ideal tetrahedral angle of 109.5 degrees. It is reduced to around 105 degrees due to the presence of two lone pairs on the oxygen atom. This distortion occurs because lone pairs exert greater electron repulsion compared to bonded pairs, resulting in a compressed bond angle.
The CCl2O molecule consists of a central carbon atom (C) bonded to two chlorine atoms (Cl) and one oxygen atom (O). In an ideal tetrahedral arrangement, the bond angle between the three atoms connected to the central atom would be 109.5 degrees. However, in the case of CCl2O, the presence of two lone pairs on the oxygen atom causes electron repulsion, which affects the bond angles.
Lone pairs of electrons occupy more space around the central atom than bonded pairs, and they exert greater repulsion. This repulsion pushes the chlorine atoms closer together, reducing the Cl-C-Cl bond angle. As a result, the bond angle in CCl2O is slightly less than the ideal tetrahedral angle, typically around 105 degrees. The presence of lone pairs on the oxygen atom introduces an asymmetry in the molecule, leading to the distortion in the bond angles from the ideal geometry.
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All of these can affect the rate at which a solid dissolves in water except -
a.) decreasing air pressure
b.) stirring the water
c.) increasing the temperature of the water
d.)using larger crystals of the solid
Answer:
d.) using larger crystals of the solid.
Explanation:
All of these can affect the rate at which a solid dissolves in water.