1. The rate constant is 3.408 /M/s.
2. The rate is 0.324 M/s.
How can the rate constant and rate of the reaction be calculated?Let's say the reaction rate is
rate = k[BF3][x.NH3][y]
where,
In the reaction, BF3 and NH3 are in x and y's order.
When comparing experiments 1 and 2, the concentration of [BF3] is the same, canceling out both experiments, giving us
rate1/rate2 = 0.250/0.125 = (0.250/0.1065 = 0.2130/0.1065 y
assuming a log from both sides,
(1) = y log (2) (2)y = 1
Because of [NH3], the sequence of reaction is 1.
Taking experiments 4 and 5, the NH3 concentration is the same.
The order with respect to [BF3] is 1 because the initial rate of reaction doubles (from 0.0596 to 0.1193) as [BF3 concentration doubles from 0.175 M to 0.350 M.
The total rate is equal to 1 + 1 = 2.
Thus, the reaction rate will be.
rate = k
[BF3][NH3]
where k represents the rate constant.
rate = k
[BF3][NH3]
with k being the rate constant
take experiment 1,
k = 0.2130/(0.250 x 0.250) = 3.408 M-1.s-1
rate when [BF3] = 0.170 M and [NH3] = 0.560 M
rate = 3.408 x 0.170 x 0.560 = 0.324 M.s-1
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Discuss the main characteristic features of the transition elements with special reference to their atomic size, variable oxidation states, magnetic and catalytic properties.
Most of the transition elements show paramagnetic behavior. The unpaired electrons in d orbitals are responsible for the magnetic properties.
What transition elements explain their magnetic and catalytic properties?The paramagnetic nature of the transition metals increases on moving from left to right as the number of unmatched electrons increases from one to five. An interesting usual of transition metals is their ability to form magnets. Metal complexes that have unmatched electrons are magnetic.
Transition elements (also known as transition metals) are elements that have relatively filled d orbitals. IUPAC defines transition elements as an element having a d subshell that is moderately filled with electrons, or an element that has the ability to form stable cations with an faultily filled d orbital.
So we can conclude that Transition elements with paired electrons are diamagnetic, meaning they are interested to magnetic fields in the opposite direction.
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how many grams are in 6.95X10^24 molecules of SF6?
One moles of SF₆ contains 6.02 × 10²³ molecules and it weighs 146 g. The number of moles of 6.95 × 10²⁴ SF₆ molecules is 11.54. he mass of 11.54 moles is 1686 g.
What is one mole ?One mole of a substance is its amount containing 6.02 × 10²³ atoms or molecules. This number is called Avogadro number. One mole of every elements contains Avogadro number of atoms.
Similarly one mole of every compound contains 6.02 × 10²³ molecules. The mass of one mole of compound is called its molar mass.
Molar mass of SF₆ = 146 g/mol
No.of atoms in 146 g or one mole of SF₆ = 6.02 × 10²³
Then, number of moles of 6.95 × 10²⁴ SF₆ molecules
= 6.95 × 10²⁴/6.02 × 10²³ = 11.54 moles.
Mass of 11.54 moles = 11.54 × 146 =1686 g.
Therefore, 6.95 × 10²⁴ SF₆ molecules weighs 1686 g.
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A 0.10 M solution of a weak monoprotic acid has a pH of 4.0. What is the ionization constant, K
a
, of the acid?
The ionization constant, Ka, of a weak monoprotic acid with a 0.10 M solution and a pH of 4.0 is 1 x 10^-4. This means that for every 0.10 moles of the acid, 0.0001 moles will dissociate in an aqueous solution.
The reaction of a weak acid with water to form ions is known as acid dissociation. Weak acids, like the one in the question, do not completely dissociate in water and are only partially ionized. The degree of ionization is dependent on the value of the acid's ionization constant, Ka. This value is a measure of the acid's strength, and is determined by the equilibrium constant for the reaction between the acid and water.
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How many bromine atoms are present in 30.1 g of CH2Br2
Answer:
There are approximately 1.43 x 10^23 bromine atoms in 30.1 g of CH2Br2.
Explanation:
Calculate the molar mass of CH2Br2:
M(CH2Br2) = M(C) + 2M(H) + 2M(Br)
M(CH2Br2) = 12.01 g/mol + 2(1.01 g/mol) + 2(79.90 g/mol)
M(CH2Br2) = 252.82 g/mol
Calculate the number of moles of CH2Br2:
n = m/M
n = 30.1 g / 252.82 g/mol
n = 0.119 mol
Determine the number of bromine atoms:
There are 2 bromine atoms in each molecule of CH2Br2, so we can use Avogadro's number to convert moles to atoms:
N = n * N_A * 2
N = 0.119 mol * 6.022 x 10^23 atoms/mol * 2
N = 1.43 x 10^23 bromine atoms
What volume in quarts is occupied by 100g of Hg?
The volume of a substance is found to be measured in Liters, Milliliters, cubic meters, etc. The volume in quarts is occupied by 100g of Hg is 0.0077.
What is volume?The term volume of a substance denotes how much capacity of matter it can hold. For example if a beaker can hold 100 mL of water, then its volume is said to be 100 mL.
The volume is also known as the ratio of mass to the density.
The equation connecting density and mass of a substance is given as:
Density (d) = Mass / Volume
Here density of Hg = 13.6 g cm⁻³, Mass = 100 g
Then d = 100 g / 13.6 = 7.352 cm³
1 cm³ = 0.001 L
V = 7.352 × 0.001 = 0.00735 L
1 L = 1.057 Quartz
0.00735 L = 0.0077 quartz.
Thus the volume in quarts is 0.0077.
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determine the total, carbonate, and noncarbonate hardness in mg/l as caco3 and in meq/l for the water analysis in problem 7.5
The total hardness = 2.84 meq/L, carbonate hardness = 2.84 meq/L, and noncarbonate hardness = 0 meq/L.
What is hardness of water?
Hardness of water refers to the presence of dissolved minerals, specifically calcium and magnesium ions, in the water. Hard water is water that has a high concentration of these minerals, which can cause issues in household appliances and plumbing, as well as affect the taste and lather quality of soaps and detergents.
To determine the total, carbonate, and noncarbonate hardness in mg/L as CaCO3 and in meq/L, you need to follow the following steps:
Calculate the total hardness:
The total hardness can be calculated using the equation:
Total hardness (mg/L as CaCO3) = (Calcium (mg/L) + Magnesium (mg/L)) × 2.5.
In this case, the total hardness = (67.2 + 40) × 2.5 = 284 mg/L as CaCO3
Calculate the carbonate hardness:
The carbonate hardness can be calculated using the equation:
Carbonate hardness (mg/L as CaCO3) = Alkalinity (mg/L as CaCO3) - (Bicarbonate (mg/L as CaCO3) + Noncarbonate hardness (mg/L as CaCO3))
In this case, the alkalinity = 284 mg/L as CaCO3 and the bicarbonate = 0 mg/L as CaCO3, so the carbonate hardness = 284 - 0 = 284 mg/L as CaCO3
Calculate the noncarbonate hardness:
The noncarbonate hardness can be calculated using the equation:
Noncarbonate hardness (mg/L as CaCO3) = Total hardness (mg/L as CaCO3) - Carbonate hardness (mg/L as CaCO3)
In this case, the noncarbonate hardness = 284 - 284 = 0 mg/L as CaCO3
Convert the values to meq/L:
To convert the values to meq/L, use the following conversion factors:
1 mg/L as CaCO3 = 0.01 meq/L
1 mg/L as MgCO3 = 0.02 meq/L
In this case, the total, carbonate, and noncarbonate hardness in meq/L can be calculated as:
Total hardness (meq/L) = 284 × 0.01 = 2.84 meq/L
Carbonate hardness (meq/L) = 284 × 0.01 = 2.84 meq/L
Noncarbonate hardness (meq/L) = 0 * 0.01 = 0 meq/L
So, the total hardness = 2.84 meq/L, carbonate hardness = 2.84 meq/L, and noncarbonate hardness = 0 meq/L.
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2h2o+2k.. please break it down for me
2H2O + 2K → 2KOH + H2↑
This reaction is Chemical displacement reaction
What chemical is produced by endothelial cells at the site of injury during the first step of platelet plug formation?
The chemical produced by endothelial cells at the site of injury during the first step of platelet plug formation is von Willebrand factor (VWF). VWF is a glycoprotein that is released from endothelial cells when they are injured.
What is endothelial ?Endothelial cells are the cells that line the inside of the body's organs and vessels, such as the intestines, the heart, and the blood vessels. These cells are a type of epithelial cell, meaning that they form a single layer that serves as a barrier between the body's organs and the outside environment. Endothelial cells are particularly important in providing a barrier between the blood and the body's other organs and tissues. They are also important in regulating the movement of fluids and nutrients throughout the body, and in providing a barrier to stop any potentially harmful substances from entering the body. Endothelial cells also play an important role in regulating the body's inflammatory response, as well as its immune response. Endothelial cells are also important in regulating vascular tone, which helps to ensure that the blood vessels are working normally.
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Oranges are typically grown in warm climates because the trees can be damaged by freezing temperatures. If an orange farmer knows that the temperatures are going to drop to below freezing they will spray orange trees with water. Which of the following explains why this protects the oranges and orange trees from freezing damage?
a) The water protects the orange trees by freezing before the oranges do; the process of freezing releases heat which is absorbed by the oranges so they don’t freeze.
b) The water protects the orange trees by freezing before the oranges do; the process of freezing absorbs heat which is released by the oranges so they don’t freeze.
The following describes the need to protect orange and orange trees from freezing damage b) The water protects the orange trees by freezing before the oranges do; the process of freezing absorbs heat which is released by the oranges so they don’t freeze.
Effect of temperature on orange treesTemperatures below 32°F (0°C) are harmful to orange trees, especially over a long period of time. High temperatures have also proved critical for tree productivity. High wind speeds and cold can also cause damage to trees, reduced vegetation, loss of fruit, and decreased quality.
So to maintain the quality of the orange trees when the temperature is cold is to water frequently because water protects the orange trees by freezing them before the oranges freeze; the freezing process absorbs the heat given off by the oranges so they don't freeze.
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Which choice has a negative charge?
O neutrons
O protons
O electrons
O nucleus
Answer:
Electrons
Explanation:
Electrons are a type of subatomic particle with a negative charge.
Protons are a type of subatomic particle with a positive charge. Protons are bound together in an atom's nucleus as a result of the strong nuclear force.
Neutrons are a type of subatomic particle with no charge (they are neutral).
1) A compound is composed of elements C, H, and N. A 8.400-mg sample of the unknown compound was combusted, producing 22.787 mg of CO2 and 6.533 mg of H2O. What is the empirical formula for this compound? (Type your answer using the format CxHyNz for the compound CxHyNz)
2) If the compound has a molar mass of 160 ± 5 g/mol, what is its molecular formula?
Answer:165
Explanation:
The empirical formula corresponds to the molecular formula, that specifies the number of atoms in a molecule. Therefore, the empirical formula is C[tex]_4[/tex]H[tex]_3[/tex]N.
What is empirical formula?In chemistry, the empirical formula is however known as that of the simplest formula. It computes the lowest whole number values of elements within a compound by applying subscripts after element symbols.
In certain circumstances, the empirical formula corresponds to the molecular formula, that specifies the number of atoms in a molecule.
mass nitrogen = 11.55 mg - 0.499 mg - 8.544 mg = 2.507 mg
moles of oxygen = 17.75 /32=0.0005moles
moles of carbon dioxide= 0.018/44=0.0004moles
moles of water = 0.007/18=0.0004moles
mass nitrogen = 11.55 mg - 0.499 mg - 8.544 mg = 2.507 mg
moles of carbon =0.008/12 =0.0007moles
moles of hydrogen = 0.000499/1=0.0004moles
moles of nitrogen =0.002/14= 0.0001moles
dividing all by 0.0007
the empirical formula is C[tex]_4[/tex]H[tex]_3[/tex]N
Therefore, the empirical formula is C[tex]_4[/tex]H[tex]_3[/tex]N.
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Enzyme molecules are affected by changes in conditions within organisms. Explain how a prolonged, excessively high body temperature during an illness could be fatal to humans. Your answer must include:
the role of enzymes in a human
the effect of this high body temperature on enzyme activity
the reason this high body temperature can result in death
Enzymes are specialized proteins which can speed the reactions to a very great extent and thereby acts as efficient catalysts. The enzyme activity depends on pH and temperature.
What are enzymes?The biological catalysts which catalyze the chemical reactions taking place inside the cells and are capable of acting independently on the cells are defined as the enzymes.
Enzymes catalyze and control several chemical reactions that occur in our living cells. They helps in digestion, liver function, breathing, reproduction, nerve function, etc. The enzyme urea catalyzes the hydrolysis of urea.
The enzyme activity is sensitive to the temperature changes. All the enzymes shows maximum catalytic activity at optimum temperature. They are found to be denatured by heat and hence their activity is destroyed at high temperatures.
Thus at high temperature the enzymes will be inactive and this will affect the vital organs and lead to death.
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Which of the following statements is true about Gamma/X-rays?
A. Gamma/X-rays are isotopes of Helium-4.
B. Gamma/X-rays have mass of 4 and charge of +2.
C. Gamma/X-rays have no mass and no charge.
D. Gamma/X-rays have the highest ionizing power.
Answer:
C. Gamma/X-rays have no mass and no charge.
Explanation:
Gamma/X-rays are a type of electromagnetic radiation with no mass and no charge. They differ from other forms of radiation, such as alpha and beta particles, which have mass and charge. Gamma/X-rays are high-energy photons that have the highest frequency and shortest wavelength in the electromagnetic spectrum. They have very high ionizing power, which means they can remove electrons from atoms and molecules as they pass through matter, leading to potentially harmful effects on living organisms.
a student dilutes 50.0 ml of a 0.10 mol/l solution of hcl to 0.010 mol/l by adding water. which statement is true? select one: a. the volume of the solution remains the same. b. the total amount of solute decreases. c. the volume of the solvent remain the same. d. the total amount of solute remain the same.
a student dilutes 50.0 ml of a 0.10 mol/l solution of hcl to 0.010 mol/l by adding water. b. the total amount of solute decreases.
The total amount of solute decreases.
To calculate this, first, find the molarity of the original solution, which is 0.10 mol/l.
Then, use the dilution equation, M1V1 = M2V2,
to find the new volume (V2) of the diluted solution.
Plugging in the known values, V2 = V1 x (M2/M1) = 50.0 ml x (0.010 mol/l/0.10 mol/l) = 5.0 ml.
Since the total amount of solute (M1V1) stays the same (0.10 mol/l x 50.0 ml = 0.5 mol),
the volume of the solution (V2) decreases, the total amount of solute decreases.
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write a net ionic and molecualr equation for displacement reaction iron(ii) acetate potassium hydroxide
Net ionic and molecular equation for displacement reaction iron(ii) acetate potassium hydroxide molecular equation
[tex]HC_2H_3O_2 (aq) \:+KOH(aq)\:\rightarrow \:KC_2H_3O_2 (aq) \:+H_2O(l)[/tex] and the Net ionic equation
[tex]HC_2H_3O_2 (aq) \:+OH^-\((aq):\:\rightarrow \:C_2H_3O_2^-(aq)\:+H_2O(l)[/tex]
Chemical reactions known as displacement reactions occur when a more reactive element removes a less reactive element from a molecule. When two chemicals interact by transferring ions, a double displacement reaction occurs, creating two new molecules. In the twofold displacement process, positive ions trade places with negative ions. In water-soluble ionic compounds, numerous double displacement reactions take arise. Precipitation reactions are those in which an insoluble solid separates from the solution and forms.
molecular equation
[tex]HC_2H_3O_2 (aq) \:+KOH(aq)\:\rightarrow \:KC_2H_3O_2 (aq) \:+H_2O(l)[/tex]
ionic equation
[tex]HC_2H_3O_2 (aq) \:+K^+(aq)\:+OH^-\((aq):\:\rightarrow \:C_2H_3O_2^-(aq)\:+ K^+(aq)\:+H_2O(l)[/tex]
Net ionic equation
Here, we cancel the ions that appear on each side of the equation.
[tex]HC_2H_3O_2 (aq) \:+OH^-\((aq):\:\rightarrow \:C_2H_3O_2^-(aq)\:+H_2O(l)[/tex]
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In performing the titration
Explanation:
responded to my question with what you want you're always saying in performing to tuition that does not help me to do anything that you want and answer with - yuri
which of the following statement is not true?a. trans alkenes are more stable than cis with the same substitutesb. a higher data delta h for heat of hydrogenation means you have a less stable alkenec. alkene stability is influenced by the degree of substitutiond. cis and geminal alkenes are considered equal in terms of stability
The statement that is not true is "cis and geminal alkenes are considered equal in terms of stability."
Alkenes are organic compounds that contain a carbon-carbon double bond and are classified into two groups based on the orientation of their substituents: cis-alkenes and trans-alkenes. The stability of alkenes is influenced by various factors, including the degree of substitution and the heat of hydrogenation (ΔH).
Generally, trans-alkenes are considered more stable than cis-alkenes with the same substituents because the substituents are farther apart in the trans isomer. Meanwhile, a higher ΔH for the heat of hydrogenation means that the alkene is less stable, as it requires more energy to convert the double bond into a single bond.
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Read the quote from chapters 1-3 of Treasure Island. "He cleared the hilt of his cutlass and loosened the blade in the sheath; and all the time we were waiting there he kept
swallowing as if he felt what we used to call a lump in the throat." Based on these actions, what emotion is Black Dog feeling?
A. Anger
B. Fear
C. Joy
D. Excitement
Suppose that at room temperature, a certain aluminum bar is 1.0000 mm long. The bar gets longer when its temperature is raised. The length lll of the bar obeys the following relation: l=1.0000+2.4×10−5Tl=1.0000+2.4×10−5T, where TTT is the number of degrees Celsius above room temperature. What is the change of the bar's length if the temperature is raised to 12.2 ∘C∘C above room temperature?
The change of the bar's length is ΔL =0. 000312 m if the temperature is raised to 12.2 ∘C∘C above room temperature.
Given that
At room temperature ( T = 25 ∘C) ,L= 1 m
L=1+2.4 X 10-5T
So the length at 13.0 ∘C above room temperature:
L=1+2.4 X 10-5T
L=1+2.4 X 10-5x13
L=1.000312 m
So the change in length
ΔL = 1.000312 - 1.0000 m
ΔL =0. 000312 m
Since the length of the aluminum bar, L is given by , L = 1.0000 + 2.4 × 10⁻⁵T and T = 14.1°C, we substitute the value of T into L. So, we have L = 1.0000 + 2.4 × 10⁻⁵ × 14.1°C = 1.0000 + 0.0003384 = 1.0003384 m. The change in length is thus 1.0003384 - 1.0000 = 0.0003384 m ≅ 0.00034 m.
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Stoichiometry worksheet 3 multi step Problems
As per the balanced reaction, 2 moles of sodium nitrate reacts with one mole of calcium carbonate. Then , 20 g or 0.2 moles of calcium carbonate needed 0.4 moles of sodium nitrate which is equal to 2.4 × 10²³ formula units.
What is Avogadro number ?One mole of every element contains 6.02 × 10²³ number of atoms. This number is called Avogadro number. Then, one mole of every compounds contain Avogadro number of molecules or formula units.
Given in the reaction, 2 moles of sodium nitrate is required by 1 mole of calcium carbonate.
molar mass of calcium carbonate = 100 g/mol
no.of moles in 20 g = 20/100 = 0.2 moles.
Hence, 20 g or 0.2 moles of calcium carbonate need 0.4 moles of sodium nitrate.
one mole of sodium nitrate contains 6.02 × 10²³ formula units. The number of formula units in 0.4 moles = 0.4 × 6.02 × 10²³ =2.4 × 10²³.
Therefore, the reaction need 2.4 × 10²³ formula units of sodium nitrate.
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Chemical action of shampoo and conditioner on hair
While shampoo opens the cuticles of the hair to remove dirt and impurities, conditioner seals them to keep moisture in. These two essential hair care products work together to give you healthy, strong, and moisturized hair.
What is the main purpose of shampoo?The shampoo's main purpose is to remove dirt and soil from your hair before conditioning it. This is typically accomplished by constructing the shampoo from two distinct types of ingredients. The first type are surfactants, which are used to clean the hair.
Hair conditioners typically contain cationic surfactants, which do not completely wash out because their hydrophilic ends bind to keratin. The surfactant molecules' hydrophobic ends then serve as the new hair surface.
Thus, A detergent molecule in shampoo acts as a surfactant, lowering the surface tension between water and sebum.
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(DUE TODAY, PLEASE ANSWER QUICKLY )
You push really hard against a round rock, but you cannot make it roll. Which statement best explains why you cannot move the rock?
Gravity pulls the rock toward the center of Earth.
The forces between you and the rock are balanced.
The force of your push is greater than the opposing force.
There is no friction to help you move the object.
Answer:
It's due to the forces that are known as balanced forces and it might also be because there is no friction
Answer:
The forces between you and the rock are balanced.
Explanation:
The force of your push against the rock and the opposing force of the rock pushing back on you are equal and opposite, meaning they balance each other out. This results in the rock not moving, because the net force on the rock is zero. This situation is referred to as static friction, which acts to prevent an object from moving when there is a force being applied to it. The force of static friction is always equal in magnitude but opposite in direction to the force being applied, until the force becomes large enough to overcome the static friction and cause the object to start moving.
Compute the atomic packing factor for the diamond cubic crystal structure (shown in the figure below). Assume that bonding atoms touch one another, that the angle between adjacent bonds is 109.5o, and that each atom internal to the unit cell is positioned a/4 of the distance away from the two nearest cell faces (a is the unit cell edge length).
The atomic packing factor for the diamond cubic crystal structure is 34% and it is a loosely packed structure.
Number of atoms contributed by the corner atoms to an unit cell is 1/8×8 =1 and number of atoms contributed by the face centred atoms to the unit cell is 1/2 × 6 = 3 and atoms inside the structure=4 ,so total number of atoms present in a diamond cubic unit cell is 1 + 3 + 4 = 8, Since each carbon atom is surrounded by four more carbon atoms, the co-ordination number is 4.
From triangle WXY
XY^2=(a/4)^2+(a/4)^2
=(a^2)/8
From triangle XYZ
XZ^2=(a^2)/8 + (a/4)^2
=(3a^2)/16
But XZ=2r
So (2r)^2 = (3a^2)/16
Atomic radius r =( a(3)^1/2)/8
Atomic packing factor is = v/V
=[(8*4*PI*r^3)/3]/[(a)^3]
By putting value of r we get-----
APF=0.34 =34%
Thus it is a loosely packed structure.
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A chemical supply company ships a certain solvent in 1010-gallon drums. Let X� represent the number of drums, ordered by a randomly chosen customer. Assume X� has the following probability mass function:x01234p(x)0.40.20.20.10.1�01234�(�)0.40.20.20.10.1(a) Find the mean number of drums ordered.(b) Find the variance of the number of drums ordered.(c) Find the standard deviation of the number of drums ordered.(d) Let Y� be the number of gallons ordered. Find the probability mass function of Y�.(e) Find the mean number of gallons ordered.
a) The mean number of drums ordered is 1.4.
b) The variance in the number of drums ordered is 0.84.
c) The standard deviation of the number of drums ordered is 0.917.
d) The probability mass function of Y is the same as the probability mass function of X.
e) The mean number of gallons ordered is 14.
(a) The mean (or expected value) of X can be found by multiplying each value of X by its probability and adding the results. So:
E(X) = (0)(0.4) + (1)(0.2) + (2)(0.2) + (3)(0.1) + (4)(0.1) = 1.4
Therefore, the mean number of drums ordered is 1.4.
(b) The variance of X can be found using the formula:
Var(X) = E(X²) - [E(X)]²
To find E(X²), we calculate:
E(X²) = (0²)(0.4) + (1²)(0.2) + (2²)(0.2) + (3²)(0.1) + (4²)(0.1) = 2.2
Then, we can find the variance:
Var(X) = 2.2 - (1.4)² = 0.84
Therefore, the variance of the number of drums ordered is 0.84.
(c) The standard deviation of X is the square root of the variance:
SD(X) = √(Var(X)) = √(0.84) = 0.917
Therefore, the standard deviation of the number of drums ordered is approximately 0.917.
(d) Let Y be the number of gallons ordered. Since each drum contains 10 gallons, we have Y = 10X. Therefore, the probability mass function of Y can be found by substituting Y/10 for X in the given probabilities:
y 0 10 20 30 40
p(y) 0.4 0.2 0.2 0.1 0.1
Therefore, the probability mass function of Y is the same as the probability mass function of X, except the values are multiplied by 10.
(e) To find the mean number of gallons ordered, we use the linearity of expectation:
E(Y) = E(10X) = 10E(X) = 10(1.4) = 14
Therefore, the mean number of gallons ordered is 14.
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The question is -
A chemical supply company ships a certain solvent in 10-gallon drums. Let X represent the number of drums, ordered by a randomly chosen customer. Assume X has the following probability mass function:
x 0 1 2 3 4
p(x) 0.4 0.2 0.2 0.1 0.1
(a) Find the mean number of drums ordered.
(b) Find the variance of the number of drums ordered.
(c) Find the standard deviation of the number of drums ordered.
(d) Let Y be the number of gallons ordered. Find the probability mass function of Y.
(e) Find the mean number of gallons ordered.
KBr + AgNO3 → KNO3 + AgBr
Zn + 2HCI → H₂ + ZnCl₂
MgCO3 → MgO + CO₂
2Fe(OH)3 → Fe₂O3 + 3H₂O
Na₂CO3 + Ca(OH)2 → CaCO3 + 2NaOH AgNO3 + HCI → AgCl + HNO3
Out of the chemical equations above, how many is (are) considered as a double replacement reaction?
A gas has a pressure of 1.43 atm and occupies
a volume of 7.7 L. If the gas is compressed to
a volume of 1.64 L, what will its pressure be,
assuming constant temperature?
The gas pressure after compression will be 6.76 atm.
What is gas pressure?The ideal gas law, one that states , PV = nRT, where P seems to be the pressure, V is the volume, n represents the number of moles of gas, R is the ideal gas constant, and T is the temperature in kelvin, can be used to calculate the pressure of a gas.Assuming that number of moles of gas as well as the temperature remain constant during compression, the gas pressure after compression can be calculated as follows:
Given
Pressure = 1.43 atm
Volume = 7.7 L
Volume after compression = 1.64 L
V2 = (nRT) / 1.64 L P2 = (nRT)
P2 denotes the pressure after compression, and V2 denotes the volume after compression. To find P2, we must enter the following values into the equation:
6.76 atm = (1.43 atm x 7.7 L) / 1.64 L
As a result, the gas pressure after compression will be 6.76 atm.
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draw ethyl ester formation with benzoic acid reaction.
The hydronium ion ion, H 3 O +, found in all solution of acids in water, serves as the real catalyst in this situation. The ester absorbs a protons (a h+) from of the base in the first step.
Acidic compounds are what?
Acidic compounds can come from both plant sources, like the citric acid found in fruits, and artificial sources, like sulphuric acid. Typical compounds that react to generate salt and water whenever they come into touch with one another are acids and bases. The word "acid" comes from the Latin acere, which means "sour."
Acid in water is what?
Any material that when dissolved in water has an acidic taste, can change the color of some indicators (such as reddening blue litmus paper), can react with some metals (such as iron) to release hydrogen, can combine with bases to produce salts, and can accelerate some oxidation processes (acid catalysis)
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Write the complete nuclear reaction describing the initial alpha decay of Ts-293. Include all reactants and products separated by a reaction arrow, and include all isotopes and particles. Balance the reaction with coefficients if necessary. Include the correct superscripts and subscripts on each isotope and particle. For example, an electron would be written
∫ −1
e
The initial alpha decay of Ts-293 (Tennessine) can be described by the following nuclear reaction:
Ts-293 → Rg-289 + He-4
In this reaction, Ts-293 (Tennessine) decays into Rg-289 (Roentgenium) and a helium-4 nucleus (alpha particle). The subscripts indicate the atomic number of each isotope and the superscripts indicate the atomic mass. The reaction is balanced, with one atom of Ts- 293 decaying into one atom of Rg-289 and one alpha particle (He-4).
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Describe the difference between a subscript number in a molecule such as H₂O versus a coefficient
number in a chemical reaction such as: 2H₂O.
A subscript number in a molecule and a coefficient number in a chemical reaction are distinct from one another.
What are molecules?A collection of atoms that have chemically joined forces to create a unique chemical species is known as a molecule. The size of a molecule can vary from a small, diatomic species like oxygen (O2) to a large, complex structure like a protein. A molecule can also contain one or more types of atoms.
While a coefficient number in a chemical process, like 2H2O, denotes the number of molecules of a substance involved in the reaction, a subscript number in a molecule, like H2O, shows the number of atoms of a certain element in the molecule.
The coefficient number describes the amount of the material involved in a reaction, whereas the subscript number refers to the molecule's composition. For instance, the subscript 2 in the molecule H2O denotes that the molecule contains two hydrogen atoms and one oxygen atom. A coefficient of 1 would suggest that only one molecule of H2O is interacting in the reaction 2H2O, whereas a coefficient of 2 indicates that there are two molecules of H2O responding.
The stoichiometry of the reaction, which characterises the relative quantities of the reactants and products, is determined by the coefficient number.
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Determine the overall charge on particles with the following subatomic makeups. 13 protons 14 neutrons 10 electrons 8 protons 10 neutrons 8 electrons 15 protons 18 neutrons 18 electrons 3 protons 3 neutrons 2 electrons
The first particle has a positive charge of +1, the second particle has a neutral charge, the third particle has a neutral charge, and the fourth particle has a negative charge of -1.
The number of electrons in each particle determines the charge of the particle. A positive charge occurs when there are fewer electrons than protons, and a negative charge occurs when there are more electrons than protons. In the first particle, there are 13 protons and only 10 electrons, so there is a positive charge of +1. In the second particle, there are 8 protons and 8 electrons, so the charge is neutral. In the third particle, there are 15 protons and 18 electrons, so the charge is neutral. In the fourth particle, there are 3 protons and 2 electrons, so there is a negative charge of -1.
It is important to understand the relationship between the number of protons, electrons, and neutrons in order to understand the behavior of atomic particles and predict their behavior in chemical reactions. The charge of a particle is a fundamental property that determines its behavior in chemical reactions and interactions with other particles.
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