Sigma bonds are formed by the end-on overlap of orbitals. A sigma bond ([tex]\sigma[/tex] bond) is a type of bond formed by the overlapping of orbitals in an end-to-end fashion.
There are two types of bonding. They are:
Sigma bond.Pi bond.A pi bond ([tex]\pi[/tex] bond) is a type of bond formed by the overlapping of the orbitals in a side-by-side fashion. One pi bond and one sigma bond are present in an alkene. Two pi bonds and one sigma bond can be found in alkynes.
Both the structure and the reactivity are greatly impacted by this. The head-on intersection of two sp orbitals results in the formation of the sigma bond. The side-on overlapping of 2p orbitals results in the formation of pi bonds.
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If 8.4g of aluminum bromide reacts, how many grams of bromine are produced?
If 8.4g of aluminum bromide reacts, 7.52 grams of bromine are produced.
8.4g AlBr3
1 mol AlBr3 (266.7g AlBr3)
3 mol Br2 (159.8g Br2/)
2 mol AlBr3
1 mol Br2
= 7.5g Br2
What is bromine?
Due to its high reactivity, the element bromine does not occur naturally as a native element, but rather as a component of table salt-like, colourless, soluble, crystalline mineral halide salts. In fact, all of the halogens, including bromine, are so reactive that they can only ever make bonds with other atoms in pairs. Although the bromide ion (Br) is relatively uncommon in the Earth's crust, its great solubility has led to its accumulation in the oceans. From brine evaporation ponds, especially in the United States and Israel, the element is easily recovered for commercial use. In comparison to chlorine, bromine makes up around one-third of the ocean's total bulk.To know more about bromine, click the link given below:
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What is the definition of an ionic bond?
Answer:
An ionic bond is a type of chemical bond formed by the attraction of two ions with opposite charges.
Explanation:
Answer:
An ionic bond is a type of chemical bond formed by the attraction of two ions with opposite charges. This bond is formed when a metal cation loses electrons to a nonmetal anion, resulting in the formation of positively and negatively charged ions that are attracted to each other.
Explanation:
Which structural fragment would give rise to a characteristic triplet-quartet pattern in the 1H NMR spectrum? A. True or false
It is True that structural fragment would give rise to a characteristic triplet-quartet pattern in the 1H NMR spectrum.
A characteristic triplet-quartet pattern in the 1H NMR spectrum typically arises from the presence of a proton that is coupled to two neighboring protons. The splitting of the peak into a triplet arises from the coupling to the two neighboring protons, while the quartet arises from the splitting of each of the triplet peaks due to the coupling between the two protons. This pattern is also known as an ABX pattern, where A represents the peak of the proton that is not coupled to the other two protons, B represents the peak of the proton that is coupled to one of the neighboring protons, and X represents the peak of the proton that is coupled to both of the neighboring protons. This type of splitting pattern can be used to identify the presence of certain structural fragments, such as a methylene (-CH2-) group flanked by two different types of protons.
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The specific heat of copper is 0.385 J/g °C. How much thermal energy is required to increase the temperature of a 20g sample of copper from 20°C to 50°C? a. 154 J
b. 385 J c. 308 J
d. 231 J
The amount of thermal energy required to increase the temperature of the 20 g sample of copper from 20°C to 50°C is 231 J, which corresponds to option (d).
The amount of thermal energy required to increase the temperature of a substance can be calculated using the formula:
Q = m x c x ∆T
where Q is the thermal energy (in joules), m is the mass of the substance (in grams), c is the specific heat of the substance (in joules/gram°C), and ∆T is the change in temperature (in °C).
In this case, we are given that the specific heat of copper is 0.385 J/g°C, the mass of the copper sample is 20 g, and the temperature change is from 20°C to 50°C. Substituting these values into the formula, we get:
Q = 20 g x 0.385 J/g°C x (50°C - 20°C)
Q = 20 g x 0.385 J/g°C x 30°C
Q = 231 J
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Aqueous barium nitrate reacts with aqueous iron (Il) sulfate
Write the
Balanced equation
Complete Ionic
Net ionic
Answer:
Balanced equation:
The balanced chemical equation for the reaction between aqueous barium nitrate and aqueous iron(II) sulfate is:
Ba(NO3)2(aq) + FeSO4(aq) → BaSO4(s) + Fe(NO3)2(aq)
Complete Ionic equation:
The complete ionic equation for the reaction between aqueous barium nitrate and aqueous iron(II) sulfate is:
Ba^2+(aq) + 2NO3^-(aq) + Fe^2+(aq) + SO4^2-(aq) → BaSO4(s) + Fe^2+(aq) + 2NO3^-(aq)
Net Ionic equation:
The net ionic equation is obtained by cancelling out the spectator ions (ions that appear on both sides of the equation and do not participate in the reaction) from the complete ionic equation. The spectator ions in this case are Ba^2+ and 2NO3^-. The net ionic equation for the reaction between aqueous barium nitrate and aqueous iron(II) sulfate is:
Fe^2+(aq) + SO4^2-(aq) → BaSO4(s)
Why does an aerial firework require two explosions of black powder?
The fireworks are set off by the first explosion, and the stars are ignited and dispersed over the sky by the second explosion.
What do you mean by the term an explosion ?An explosion is a sudden increase in volume accompanied by a tremendous energy release that typically results in the production of high temperatures and the discharge of high-pressure gases.
Black powder has to explode twice for an aerial firework to perform correctly.
The effectiveness of the firework as a whole depends on the precise timing and positioning of each explosion as well as the usage of particular chemicals in the effect charge.
Thus, an aerial firework requires two explosions of black powder because the firework is set off by the first explosion, and the intended visual effects are produced by the second explosion.
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what is/are the diagnostic signal(s) in the ir spectrum of the indanol product that suggests that the desired product is being formed? is it possible to tell whether any unreacted starting material is present?
The presence of a hydroxyl group (OH) stretching at around 3300–3500 cm-1 and a carbonyl group (C=O) stretching at about 1700–1750 cm-1 are two diagnostic signal indications in the IR spectrum of the indanol product that point to the formation of the intended product.
Diagnostic signals are distinct traits that can be utilised to determine if a molecule, functional group, or physical attribute is present or absent in a spectrum or analysis. Diagnostic signals are signals that are specific to a certain chemical structure or bond, allowing for the identification of the compound or the presence of specific functional groups, in the context of spectroscopy. These signals can be utilised to locate and measure the target molecule or functional group because they are frequently connected to certain peaks, wavelengths, or frequencies. Chemical analysis frequently relies on diagnostic signals because they make it possible to precisely and accurately identify certain substances or functional groups in intricate combinations.
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Given the balanced equation:
2Al(s) + 6H+ (aq) -----> 2Al^3+ (aq) + 3H2(g)
What is the total number of moles of electrons gained by H+ (aq) when 2 moles of Al(s) are completely reacted?
1) 6
2) 2
3) 3
4) 12
The total number of moles of electrons transferred from Al to H⁺ is 6
The given reaction can be split up into two half-reactions as follows:
2 Al (s) → 2 Al³⁺ (aq) + 6 e⁻
6 H⁺ (aq) + 6 e⁻ → 3 H₂ (g)
From the first half-reaction, it is clear that 2 moles of Al give out 6 moles of electrons to become Al³⁺.
From the second half reaction, it is clear that these 6 moles of electrons are accepted by H⁺ to become H₂ gas.
What is a half-reaction?
A half reaction is either the oxidation or reduction reaction component of a redox reaction. A half reaction is obtained by considering the change in oxidation states of individual substances involved in the redox reaction
How does half-reaction work?
In general, the half-reactions are first balanced by atoms separately. Electrons are included in the half-reactions. These are then balanced so that the number of electrons lost is equal to the number of electrons gained. Finally, the two half-reactions are added back together.
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Answer:
3
Explanation:
because i did this when i was a kid
7) Using the following balanced equation 4 Fe(s) + 302(g) → 2Fe2O3(s)
a) How many moles of product would be produced by complete reaction of 0.15 moles of iron? (Be sure to show
your work including the mole ratio you used)
Answer:
0.075 moles
Explanation:
Looking at the balanced equation, 4 moles of Fe(s) react with 3 moles of [tex]O_{2}[/tex] to produce 2 moles of [tex]Fe_{2}O_{3}[/tex] (s). In other words, for every 4 moles of Fe(s) used, there are 2 moles of product. The mole ratio is therefore 4:2, or 2:1. In other words, you divide the moles of Fe by two to find the moles of product.
There are 0.15 moles of Fe, so the moles of product should be half of this according to the molar ratio.
0.15 / 2 = 0.075Your answer is 0.075 moles.
Hope this helps!
the half-life of a certain radioactive material is 4 days. the length of time it will take for the material to decay to 17 of its original mass is
If the half-life of a certain radioactive material is 4 days. the length of time it will take for the material to decay to 17 of its original mass is 11.06 days.
To solve this problem, we can use the formula for exponential decay:
N(t) = N0 * (1/2)²(t/T)
where:
N(t) is the amount of the radioactive material remaining after time t
N0 is the initial amount of the radioactive material
T is the half-life of the radioactive material
We want to find the time it will take for the material to decay to 1/7 of its original mass, which means that N(t) = N0/7.
Using the formula above and plugging in the given values, we get:
N0/7 = N0 * (1/2)²(t/4)
Dividing both sides by N0 and taking the natural logarithm of both sides, we get:
ln(1/7) = ln(1/2)²(t/4)
ln(1/7) = (t/4) * ln(1/2)
t = (4/ln(1/2)) * ln(1/7)
t ≈ 11.06 days
Therefore, it will take approximately 11.06 days for the radioactive material to decay to 1/7 of its original mass, given a half-life of 4 days.
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elements that are most similar in their properties are found _____
Elements that are most similar in their properties are found in the same period of the periodic table. The number of electron shells is the same for elements in the same period of the periodic table.
As a result, they have similar electron configurations and thus similar chemical and physical properties. Elements are arranged in columns termed "groups" according to their chemical similarities (or families). When two different elements share the same number of valence electrons, their chemical characteristics are likely to be comparable. The same column of the Periodic Table contains elements that have the same number of valence electrons. Elements having the same valence shell are found in the same row of the periodic table.
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The amount of gas dissolved in solution tends to __ as the temperature decreases
Remain the same
Increase
Decrease
The amount of gas dissolved in solution tends to increase as the temperature decreases.
What is the ideal gas law?The ideal gas law describes the relationship between the amount of gas, temperature, pressure, and volume of an ideal gas. It states that the product of the pressure and volume of a gas is directly proportional to the number of gas molecules present (measured in moles), the temperature of the gas (measured in Kelvin), and a constant known as the gas constant (R). This can be expressed mathematically as PV = nRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is gas constant, and T is the temperature in Kelvin.
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Answer: Increase
Explanation:
a) Calculate the pH of a 0.1 mol/L solution of hydrosulfuric acid [4 marks]
b) Calculate the concentration of H3O+ present in this solution (2 marks)
Answer:
a) The pH of a 0.1 mol/L solution of hydrosulfuric acid is 1.00.
b) The concentration of H3O+ present in this solution is 0.1 mol/L.
Answer:
A) To calculate the pH of a 0.1 mol/L solution of hydrosulfuric acid (H2S), we can first calculate the concentration of hydronium ions (H3O+) produced in solution.
Hydrosulfuric acid dissociates in water according to the following equation:
H2S + H2O → H3O+ + HS-
Since the concentration of hydrosulfuric acid is 0.1 mol/L, the concentration of hydronium ions produced will also be 0.1 mol/L.
Next, we can use the concentration of hydronium ions to calculate the pH of the solution:
pH = -log[H3O+] = -log(0.1) = 1
So, the pH of a 0.1 mol/L solution of hydrosulfuric acid is 1.
B) The concentration of H3O+ present in the solution is 0.1 mol/L.
Explanation:
ALLEN
a gas at 24o c with a pressure of 100 kpa has a volume of 5.0 l. if the volume increases to 20.0 l what is its new pressure? assume that the temperature remains constant.
We can use the ideal gas law, PV = nRT, to determine the new pressure of the gas when its volume increases. The ideal gas law relates the pressure, volume, and temperature of a gas to the number of moles (n) of gas and the gas constant (R).
First, we'll convert the temperature to kelvins:
[tex]T (K) = 24°C + 273 = 297 K[/tex]
Next, we'll use the original pressure and volume to determine the number of moles of gas (n):
PV = nRT
n = PV / RT
n = (100 kPa * 5.0 L) / (8.31 J/mol K * 297 K) = 0.17 mol
Finally, we'll use the new volume, the number of moles of gas, and the temperature to determine the new pressure:
PV = nRT
P = (nRT) / V
P = (0.17 mol * 8.31 J/mol K * 297 K) / (20.0 L) = 46.5 kPa
So the new pressure of the gas is 46.5 kPa, when its volume increases from 5.0 L to 20.0 L while the temperature remains constant at 24°C.
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When acids are added to a solution, the pH should ________.a. decreaseb. increasec. stay the samed. cannot tell without testing
When acid is added to a solutions, it increases the H⁺ ion concentration in the solution. So the pH will decrease. So the correct option will be A.
Acid is a chemical substance which can give H⁺ ions in water. Higher the hydrogen ion concentration higher will be the acidity.
Acidity is usually measured using pH scale. 7 in the pH scale is neutral. Lower than 7 it is acidic and higher than 7 is basic. Equation for the pH is as follows;
pH = -log[H⁺]
That means higher the concentration of hydrogen ions, lower will be the pH.
So as acid is added to a solution, hydrogen ion concentration increases, and the pH decreases.
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For waste hazardous materials packaged in a lab pack, the inside packaging must be?
The interior packagings must either be made of glass with a maximum capacity of 4 L (1 gallon) or of metal or plastic with a maximum capacity of 20 L (5.3 gallons).
A chemically suitable absorbent material must be present around inner packaging holding liquid in an amount adequate to absorb the entire liquid content.
physical packing. Only one type of waste material may be contained in each outer package. Except for Division 4.2 Packing Group I materials, which must be packaged in UN standard steel or plastic drums tested and marked to the Packing Group I performance level for liquids or solids, and bromine pentafluoride and bromine trifluoride, which cannot be packaged in UN 4G fiberboard boxes, the following outer packagings are permitted.
a metal drum (UN 1A2, UN 1B2, or UN 1N2), a plywood drum (UN 1D), a fibre drum (UN 1G), a plastic drum (UN 1H2), tested, and designated to at least the Packing Group III performance.
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Is alchemy a real science? In three to five sentences, explain your answer.
Alchemy is not real science. Unlike real science, Alchemy does not utilize all parts of the scientific method. Alchemy cannot be tested using experimentation. Data cannot be collected. Other scientists cannot repeat procedures and get the same results.
Alchemy is not a real science. Alchemy is best described as form of 'proto-science' rather than distinct science in its own right.
What is alchemy?Alchemists throughout the ages sought to harness power of nature through scientific intervention, often implementing it to artistic effect. In medieval Europe, alchemy was referred as “The Great Art.”
Alchemy is described as form of 'proto-science' rather than distinct science because, although many observations and theories made by alchemists were based on scientific fact, they often explained these in terms of divine intervention.
Alchemical practice began about 1,500 years ago in Hellenistic Greece and it came to Europe by way of Middle East. Like the word algebra, alchemy has its Arabic influences in its name. Alchemy flourished in Europe between 13th and 18th centuries.
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how would increasing the molarity of cuso4 affect this reaction?
The molarity of CuSO₄ affect this reaction as the Molarity of the solution increasing would decrease the mass able to be recovered.
Molarity of a given result is defined as the total number of intelligencers of solute per litre of result. The molality of a result is dependent on the changes in physical parcels of the system similar as pressure and temperature as unlike mass, the volume of the system changes with the change in physical conditions of the system.
Molarity is represented by M, which is nominated as molar. One molar is the molarity of a result where one gram of solute is dissolved in a litre of result. As we know, in a result, the detergent and solute mixture to form a result, hence, the total volume of the result is taken.
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Complete question:
How would increasing the molarity of CuSO4 affect this reaction? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer.
a The Molarity of the solution would have no effect on the reaction
b The Molarity of the solution increasing would decrease the mass able to be recovered
с The molarity of the solution determines the mass of copper available for reaction and so the possible mass of copper that could accumulate on the zinc pellets would increase.
d Not enough information is given to determine the effect of increasing the concentration of the CuSO4
In 1996, Michael Johnson ran 10.4 m/s. Johnson's mass at the time of his record-breaking run was about 77 kg. What was his momentum at this speed?
Answer:
[tex]\huge\boxed{\sf P = 800.8\ Ns}[/tex]
Explanation:
Given data:Speed = v = 10.4 m/s
Mass = m = 77 kg
Required:Momentum = P = ?
Formula:P = mv
Solution:Put the given data in the above formula.
P = (77)(10.4)
P = 800.8 Ns[tex]\rule[225]{225}{2}[/tex]
what is the effect of weathering by carbonic acid on these minerals? question 14 options: quartz ferromagnesian (mafic) minerals feldspars calcite
Carbonic acid can weather and dissolve calcite, a mineral composed of calcium carbonate. Quartz, a mineral composed of silicon dioxide, is relatively resistant to chemical weathering by carbonic acid.
As per the question given,
Ferromagnesian (mafic) minerals, such as olivine, pyroxene, and amphibole, may weather and form secondary minerals in the presence of carbonic acid. Feldspars, which are common minerals in igneous rocks and sediments, can undergo chemical weathering by carbonic acid and transform into clay minerals, which are stable at Earth's surface conditions.
What exactly is carbonic acid?
Carbonic acid, with the chemical formula H2CO3, is a carbon-containing substance. This chemical is found in minute concentrations in carbon dioxide solutions in water. Because this combination has one carbon-oxygen double bond, its chemical formula can also be written as OC(OH)2.
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use percentages given that the molecular mass of magnesium hydroxide (mg(oh ) 2 ) is 58.32 amu and the atomic mass of an atom of oxygen is 15.999 amu, what percentage of this compound is oxygen?
The percentage of this compound Mg(OH)2 which is oxygen with atomic mass of an atom of oxygen is 15.999 amu is 54.9%.
Percentage by mass is a way of representing the concentration of an element in a compound. It is calculated as the mass of the element divided by the total mass of the compound, multiplied by 100.
%O = 2*16/58.32 x 100 = 54.9%
The percentage of this compound is 54.9%
% Mg=24.30 /58.32×100%
=41.67%
% O=32.00 /58.32×100%
=54.87%
% H =2.016 /58.32×100%
=3.457%
The infinitesimal mass of an element is defined as the sum of the mass of the total number of protons and neutrons in an snippet. It's expressed as amu. For one operative of an element, the infinitesimal mass is expressed in g/ spook.
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After the correct formula for a reactant in an equation has been written, the:
A. Subscripts are adjusted to balance the equation
B. Formula should not be changed
C. Same formula must appear as the product
D. Symbols in the formula must not appear on the product side of the equation
Once a reactant's correct formula has been placed in an equation, the A. The equation is balanced by adjusting the subscripts.
The correct formula for a reactant in a chemical equation must be written first, and then the subscripts are adjusted to balance the equation. Balancing the equation means making sure that the same number of each type of atom appears on both the reactant and product sides of the equation. This can be done by adding coefficients in front of the formulas as necessary. Once the equation is balanced, the formula should not be changed. The same formula must appear on both the reactant and product sides of the equation, but the coefficients may be different. The symbols in the formula must not appear on the product side of the equation unless the formula has been balanced first.
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if a compound is being made with 1 tablespoon of hydrocodone solution and 2 tablespoons of cherry flavoring, how would the ratio be written?
The ratio of hydrocodone answer for cherry seasoning in the compound can be composed as:
1:2.
The proportion of hydrocodone answer for cherry enhancing in the compound is 1:2. This implies that how much hydrocodone arrangement is utilized is half of how much cherry enhancing is utilized. Proportions are an approach to looking at least two amounts, and they are commonly communicated as a small portion or with a colon. For this situation, the proportion is communicated utilizing a colon to isolate the two amounts. Proportions can be utilized in various settings, from cooking to science to back. In this particular case, the proportion is utilized to guarantee that the perfect proportion of every fixing is being utilized to make the ideal compound.
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What mass of mgF2 is needed to produce 1. 4 mol of liF
To produce 1.4 mol of LiF, we need 0.7 mol of MgF2. This corresponds to a mass of 43.6 grams of MgF2, based on the molar mass of MgF2.
Summary of Calculations for Producing LiF with MgF2.We're given that we need to produce 1.4 mol of LiF, and we're asked to find out how much MgF2 is needed for this reaction. We can start by writing out the balanced chemical equation for the reaction:
MgF2 + 2 LiF → 2 LiF + MgF2
From this equation, we can see that 1 mol of MgF2 reacts with 2 mol of LiF to produce 1 mol of MgF2 and 2 mol of LiF. This means that the stoichiometry of the reaction is 1:2 for MgF2 and LiF. In other words, for every 1 mol of MgF2 that reacts, 2 mol of LiF is produced.
So, if we want to produce 1.4 mol of LiF, we need to use stoichiometry to figure out how much MgF2 we need. We can use a conversion factor that relates the number of moles of LiF to the number of moles of MgF2:
1.4 mol LiF × (1 mol MgF2 / 2 mol LiF) = 0.7 mol MgF2
This tells us that we need 0.7 mol of MgF2 to produce 1.4 mol of LiF.
To convert from moles to grams, we can use the molar mass of MgF2, which is 62.3 g/mol. Multiplying the number of moles by the molar mass gives us the mass of MgF2 needed:
0.7 mol MgF2 × 62.3 g/mol MgF2 = 43.6 g MgF2
Therefore, we need 43.6 grams of MgF2 to produce 1.4 mol of LiF.
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Can someone help me?
What's the Claim, evidence, and reasoning for this
There are about 6 beakers and the beakers are about a length of 225 kilometers; a colorless hydrogen pouring it to beaker number 2 and then a color change occurred to purple or pinkish then it’s going to pour it to the third beaker and what happened is the color changed back to colorless; after that pouring the third beaker to the fourth, the colorless hydrogen turned to something like a bubbling dancing around the solution and it wasn’t kind of clear and after that; pouring fourth to the fifth, the substance of the hydrogen were very cloudy it was also not very clear and lastly from fifth to sixth; the color change to pinkish and not clear.
Claim: The color of the hydrogen changed from colorless to pinkish when poured from the fifth beaker to the sixth.
Evidence: The substance of the hydrogen changed from colorless to a bubbling dancing around the solution to cloudy and finally to pinkish when poured from the fifth beaker to the sixth.
Reasoning: The change in the color of the hydrogen can be attributed to the differences in the chemical makeup of the beakers. The chemical makeup of the fifth beaker was likely more reactive than that of the fourth, resulting in a cloudy mixture when the hydrogen was poured into it. This reaction created a new compound which was then poured into the sixth beaker, resulting in the hydrogen changing color to pinkish.
What is compound?Compound in chemistry is a substance composed of two or more elements chemically combined in a fixed ratio.
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how many atoms are there in 5.90 moles of calcium
Answer:
3.55x10^24 atoms Ca
Explanation:
Use Avogadro's number: 6.022 x 10^23
5.90molsCa x (6.022x10^23/1mol) = 3.55x10^24
What is the empirical formula for the molecular formula given?
Molecular formula: C5H120
OC₂H6O
OCH5O
O C3H6O
O C5H12 O
The empirical formula for the molecular formula given is C₅H₁₂O as the subscripts cannot be reduced further.
What is empirical formula?Empirical formula of a compound is defined as the simplest whole number ratio of atoms which are present in a compound.It does not make any mention of the arrangement of atoms or the number of atoms. The empirical formula gives information about the ratio of number of atoms which are present in a compound.
Molecular formula is determined from the empirical formula by dividing the molar mass of a compound by the empirical formula mass. The resultant which should be a whole number or very close to the whole number , then the subscripts are multiplied by the whole number to get the molecular formula.
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Transcribed image text: If a reaction is first order with a rate constant of 0.0450 s', how much time is required for 65% of the initial quantity of reactant to be consumed? 1 2 4 4 5 7 8
It will take approximately 23.6 seconds for 65% of the initial quantity of reactant to be consumed in this first-order reaction.
The integrated rate law for a first-order reaction is:
ln([A]/[A]₀) = -kt
where [A] is the concentration of the reactant at any time t, [A]₀ is the initial concentration, k is the rate constant, and t is time.
If we rearrange this equation, we get:
t = (-1/k) × ln([A]/[A]₀)
We are given that the rate constant is 0.0450 s⁻¹. We can use the fact that 65% of the initial quantity of reactant remains to find the concentration of the reactant at that point:
[A]/[A]₀ = 0.35
Now we can substitute in the values and solve for the time:
t = (-1/0.0450 s⁻¹) × ln(0.35) = 23.6 s
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Cice = 2.10 J/g·°C, Cwater = 4.18 J/g·°C,
Csteam = 2.08 J/g·°C, ∆Hfus = 6.01 kJ/mol,
∆Hvap = 40.68 kJ/mol.
Find the value for q when 15.0 g water freezes.
The heat absorbed when 15.0 g of water freezes is 5.01 kJ.
What is heat absorbed ?
Chemical reaction or physical change is endothermic if heat is absorbed by the system from the surroundings.
The heat absorbed or released during a phase change can be calculated using the equation q = mL,
where
m is the mass of the substance undergoing the change L is its heat of fusion or vaporization.For the case of 15.0 g of water freezing, the heat absorbed can be calculated as follows:
q = mL
q = (15.0 g) * (6.01 kJ/mol) / (18.015 g/mol)
q = 5.01 kJ
Therefore, the heat absorbed when 15.0 g of water freezes is 5.01 kJ.
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Do you or anyone you know follow more than one calendar system? Which ones?
Some people do follow more than one calendar system to know some particular days, month or something based on their rituals and religions.
What is world accepted calendar system ?The world accepted calendar system is Christian calendar. There are different calendar systems in use in the present era such as Chinese calendar, Ethiopian calendar, Jewish calendar etc.
Each calendars have their own peculiarities in use and in the determination of days, months or the identifying any special day. There are some people using more than one calendar system.
For example, some are using religious calendars such as 'hijra ', 'Saka Varsha ' etc. to know some special days based on their cultural rituals.
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