The ion with a mass number of 65, with 36 neutrons and a charge of +1 is Copper (Cu). It has 29 protons and 28 electrons.
An ion is a charged particle formed when an atom loses or gains electrons. When electrons are lost, a negatively charged anion is formed, electrons are gained. a positively charged cation is formed.
The ion in the question has a mass number of 65. This means that the total number of protons and neutrons is 65. To get the number of protons, we subtract the number of neutrons from the mass number. That will give us 29 protons.
From the number of protons, we can identify the element symbol. The number of protons equal to the atomic number. Hence, the ion has an atomic number of 29. On the periodic table, the element with an atomic number of 29 is Copper (Cu). It also has a charge of +1, meaning that it has given out one electron. Therefore, it will have 28 electrons instead of 29.
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What is NOT a reason to use models in science?
some systems are too large, to small, and/or too complex, they are difficult to
predict
to replicate and simplify physical reality to allow for precise experiments
to convince society that the hypothesis is accurate
to aid in the development of questions and explanations about systems
Answer:
to convince society that the hypothesis is accurate
How much 0.3 m h2so4 is needed to neutralize 34.0 ml of a 0.25 m solution of naoh?
14.1 mL H₂SO₄ is needed to neutralize solution of NaOH.
Balanced chemical equation for neutralization reaction of sulfuric acid and sodium hydroxide:
H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O
c(H₂SO₄) = 0.3 M = 0.3 mol/L; concentration of sulfuric acid
V(NaOH) = 34.0 mL = 0.034 L; volume of sodium hydroxide
c(NaOH) = 0.25 M = 0.25 mol/L; concentration of sodium hydroxide
n(NaOH) = c(NaOH) × V(NaOH)
n(NaOH) = 0.25 mol/L × 0.034 L.
n(NaOH) = 0.0085 mol; amount of sodium hydroxide
From chemical reaction: n(H₂SO₄) : n(NaOH) = 1 : 2.
n(H₂SO₄) = 0.0085 mol ÷ 2
n(H₂SO₄) = 0.00425 mol; amount of sulfuric acid
V(H₂SO₄) = n(H₂SO₄) ÷ c(H₂SO₄).
V(H₂SO₄) = 0.00425 mol ÷ 0.3 mol/L.
V(H₂SO₄) = 0.0141 L = 14.1 mL; volume of sulfuric acid
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What+is+the+major+disadvantage+of+using+concentrated+sulfuric+acid+rather+than+85%+phosphoric+acid+for+the+dehydration+of+alcohols?
The major disadvantage of using concentrated sulfuric acid rather than 85% phosphoric acid for the dehydration of alcohols is that concentrated sulfuric acid produces messy results.
Concentrated sulfuric acid or concentrated phosphoric(V) acid (H₃PO₄) are used in alcohol dehydration.
Concentrated sulfuric acid eliminates a water molecule from the organic molecule in a dehydration reaction.
Sulfuric acid (H₂SO₄) is a strong acid and a strong oxidizing agent.
It oxidizes the alcohols to carbon dioxide, while it is reduced to sulfur dioxide. Reaction is very exothermic, release a lot of energy.
Sulfuric acid is strong diprotic acid. It dissociates on hydrogen cations (H⁺) and sulfate anion (SO₄²⁻).
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What products may be formed when a hydrocarbon undergoes combustion? select all that apply.
When a hydrocarbon undergoes combustion it produces carbon dioxide (CO2), water (H2O), heat, and light.
The carbon compounds which contain only carbon and hydrogen are called hydrocarbons.
Examples of hydrocarbons are compounds like CH4, C2H6, C2H4, C2H2, etc.
Based on the presence of double bonds/triple bonds, the hydrocarbons are of three types- alkanes, alkenes, and alkynes, as shown in the image.
Alkanes are those hydrocarbons that do not contain any double bond.
Alkenes are those compounds that contain at least one double bond between carbon atoms while alkynes contain a triple bond.
All the hydrocarbons mentioned above give the same reaction on their combustion that is
Hydrocarbon + O2 = CO2 + H2O + HEAT + LIGHT
For example,
CH4 + O2 = CO2 + H2O + Heat + Light
Hence, when a hydrocarbon undergoes combustion it produces carbon dioxide (CO2), water (H2O), heat, and light.
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Recall that you may have seen bubbles of gas forming during the redox reaction. Those bubbles are due to a side reaction between some of the aluminum wire and acid (H+ ions) formed by the hydrolysis of the copper ions. Write a balanced net ionic reaction that occurs between aluminum metal and acid ions. Which element is oxidized, which element is reduced?
Here the reaction is of single displacement reaction.
Here, as the affinity of Aluminum is more than hydrogen to form stable compound with the corresponding negative ion of acid. This can be seen through the reactivity series of metal.
Here redox reaction takes place in two parts: Reduction reaction at cathodic site (gain or electron or reduction in oxidation state) and oxidation reaction at anodic site (lose of electron or increase in oxidation state).
Anodic reaction:
Al = Al₃⁺ + 3e⁻
Cathodic reaction:
2H⁺ + 2e⁻ = H₂
A displacement reaction happens while a more reactive detail displaces, or pushes out, a much less reactive element from a compound that carries the less reactive element. After a displacement reaction, the much less reactive element is now pure and left uncombined.
A single-displacement reaction, also known as single replacement reaction or exchange reaction, is a chemical reaction wherein one element is replaced by means of every other in a compound.
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When a carbonate reacts with an acid it produces carbon dioxide, a salt, and what other product? Give the name, not the formula
A salt, water, and carbon dioxide are produced when acids react with carbonates, such as calcium carbonate (found in chalk, limestone, and marble). Fizzing is the result of the reaction's bubbling, which is caused by the carbon dioxide.
What happen when a carbonate reacts with an acid ?Salt, carbon dioxide, and water are produced when an acid combines with metal carbonate.
An illustration of this reaction is the formation of sodium chloride, carbon dioxide, and water when diluted hydrochloric acid combines with sodium carbonate.
2NaCl (aq) + CO2 (g) + H2O = Na2CO3(s) + 2HCl (aq) (l)
Because the acid is neutralised in these reactions, they are known as neutralisation reactions. In other words, the pH of the mixture approaches 7, or the acid and base (carbonate) are neutralised.
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Determine the volume occupied by 1.5 g of ethyl alcohol. the density of ethyl alcohol is 0.789 g/ml
The volume occupied of ethyl alcohol with a density of 0.789 g/ml and a mass of 1.5 g is: 1.9011 ml
The density formula and the procedure we will use is:
d = m/v
Where:
v= volumed= densitym= massInformation about the problem:
d= 0.789 g/mlm = 1.5 gv = ?Applying the density formula and clearing the volume we get:
d = m/v
v = m/ d
v = 1.5 g/0.789 g/ml
v = 1.9011 ml
What is density?It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.
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How can a knowledge of chemistry help you be a more informed citizen?
Knowledge of chemistry help you be a more informed citizen in many ways because it is the foundation of our world.
Chemistry and other scientific knowledge can help you assess the evidence offered, create an informed judgement, and take the necessary action.Our basic needs of food, clothes, shelter, health, energy, and pure air, water, and soil are all met by chemistry.It is beneficial to have some knowledge of chemistry because it gives a solid foundation for comprehending the physical universe in which we live. Everything is chemical, for better or worse.Chemistry knowledge is necessary to create synthetic materials, life-saving pharmaceuticals, and spacecraft.A fundamental understanding of chemistry is necessary before one can comprehend why an autumn leaf turns red, why a diamond is hard, or why soap makes us clean.So,Society as we know it, has been greatly influenced by chemistry, from the creation of stronger materials for large-scale construction to the kind of cosmetics you use on a daily basis.
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Please help me with questions 5 and 6
Explanation:
5) Uranium-234
Symbol- 234U
Names - uranium-234, U-234, Uranium II ( hist )
Protons (Z) - 92
Neutrons (N) - 142
Uranium-235
Symbol - 235U
Names - uranium-235, U-235
Protons (Z) - 92
Neutrons (N)- 143
Uranium-238
Symbol - 238U
Names - uranium-238, U-238
Protons (Z) - 92
Neutrons (N) - 146
what is meant pyrolysis?
Answer:
Pyrolysis is the heating of an organic material, such as biomass, in the absence of oxygen. Biomass pyrolysis is usually conducted at or above 500 °C, providing enough heat to deconstruct the strong bio-polymers mentioned above.An ice cube weighing 18 g is removed from a freezer where it has been at -20 C. How much heat is required to warm it to 0 c without melting it?
The amount of energy needed to raise the temperature from -20° to 0° is 730.8 J.
1) The specific heat capacity of a substance is the amount of heat needed to raise its temperature by one degree Celsius. Joules are commonly used to measure the amount of heat (J).
2) The capacity of a substance to produce heat per gram is determined by another attribute called specific heat.
By using the formulae of specific heat capacity
q = m x C x ΔT
q = mxc x (T2 - T1)
q = amount of heat energy
m = mass of sample
C = heat capacity of ice =2.03 (J/g C°)
T2 = final temperature
T = initial temperature
Mass of ice = 18 g
Initial temperature = -20 C
Final temperature = 0°
q = 18×2.03 × (0-(20))
q = 730.8 j
By using the heat capacity formulae we can find the heat energy to raise the temperature .
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Two difference between red blood cells and white blood cells:
Red blood cells
[•] More in numbers.
[•] No antibodies present in these cells.
White blood cells
[•] Less in numbers
[•] Antibodies are present in these cells.
Two different compounds containing osmium and oxygen have the following mass of oxygen per grams of osmium 0.168 & 0.3369g. Show that these amounts are constituent with the law of multiple proportions
Yes, given compound's amount are constituent with the law of multiple proportions .
Briefing :mass of oxygen = 0.168g
mass of osmium = 0.3369g
So,
the proportion = (0.3369 / 0.168)
the proportion = 2.00
That is, multiple proportions.
The ratio of the masses of O combined with 1 g of Os in the compound must be a small whole number in order for the law of multiple proportions to hold.
Note that there are only two elements being discussed in the problem. Different compounds are being created by the two elements combining in various ways.
What is law multiple proportions?The law of multiple proportions states that when two elements combine to form more than one compound, the combined weights of each element are in a ratio of small whole numbers.
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Calculate the fluoride ion concentration and ph of a solution containing 0.10 mol of hcl and 0.20 mol of hf in 1 l of solution. ka for hf equals 6.8 * 10-4.
The fluoride ion concentration is 1.4 x [tex]10^-^3[/tex], and the solution's pH is 1.
The main species in solution are [tex]H^+[/tex], [tex]Cl^-[/tex], HF, and the solvent [tex]H_2O[/tex] since HCl is a strong acid and HF is a weak acid. The question requests the fluoride ion concentration [[tex]F^-[/tex]], which are created when HF is ionized. Consequently, the crucial equation is:
[tex]HF (aq) \leftrightarrow H^+ (aq) + F^- (aq)[/tex]
Equilibrium 0.20 – x mol 0.10 + x mol 0 + x mol
Equilibrium constant = 6.8 x [tex]10^-^4[/tex]
[tex]Ka = \frac{[H^+][F^-]}{[HF]}[/tex]
6.8 x [tex]10^-^4[/tex] = [0.10] [x] / [0.20]
x = (0.20 / 0.10) x 6.8 x [tex]10^-^4[/tex]
x = 1.4 x [tex]10^-^3[/tex]
Fluoride ion concentration, [[tex]F^-[/tex]] = 1.4 x [tex]10^-^3[/tex]
[[tex]H^+[/tex]] = (0.10 +x) = 0.10M
Thus, pH = 1.00 since it is entirely from HCl and HF has negligible contribution.
Result:
The fluoride ion concentration is 1.4 x [tex]10^-^3[/tex] and the pH of the solution is 1.00.
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Ali notices that the electrical cord on his microscope is frayed near the plug. He takes the microscope to his teacher and asks for permission to use another one.
Yes, Ali did the correct job by taking the microscope to his teacher and asks for permission to use another one.
We should never use equipment with frayed or damaged electrical cord and should inform our teacher or lab assistant immediately. This situation comes under measure lab safety rules.These and all other electrical equipment used in lab settings provide a risk of electric shock injuries, fires from faulty installations or maintenance, and fires from sparks acting as an ignition source for flammable or combustible chemicals.Discover where your electrical panels and shut-off switches are so you can immediately turn off the power in an emergency. Always provide at least three feet of space around electrical panels so that people can easily access them.Working with damaged equipment or electric cord can lead to big accidents in the labs.It shows Ali followed lab safety rule properly.
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Molarity1. how many moles of koh are contained in 252 ml of 0.960 m potassium hydroxide solution?
The solution of potassium hydroxide with a volume of 252 ml and a concentration of 0.960 m has: 0.24192 mol
To solve this problem, the formula and the procedure that we have to use is:
m = n(solute)/v(solution) L
Where:
m= molarityn = molesm = massInformation about the problem:
v(solution) = 252 mLm = 0.960 mol/Ln (koh) =?By converting the volume units from (ml) to (L) we have;
v(solution) = 252 mL * 1L/1000 mL
v(solution) = 0.252 L
Applying the molarity formula, and clearing the moles we get:
m = n(solute)/v(solution) L
n(solute) = m * v(solution) L
n(koh) = 0.960 mol/L * 0.252 L
n(koh) = 0.24192 mol
What is a solution?In chemistry a solution is known as a homogeneous mixture of two or more components called:
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The highest possible temperature for a combustible mixture when all the possible chemical heat is released and all of the heat is applied to raising the temperature of the mixture is known as the?
The adiabatic flame temperature is possible chemical heat is released and all of the heat is applied to raising the temperature of the mixture
Energy is released to the combustion products during a combustion event. The temperature of the combustion products, if no heat is lost during this process, is referred to as the "Adiabatic Flame Temperature."Depending on how the operation is carried out, there are two types of adiabatic flame temperature: constant volume and constant pressure. The temperature that arises from a full combustion process that takes place without any work, heat transfer, changes in kinetic or potential energy, or any other process, is known as the constant volume adiabatic flame temperature. Because no energy is used to modify the system's volume, its temperature is higher than in the constant pressure process (i.e., generate work).The adiabatic flame temperature is used to raised the temperature of all mixture.
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Write a poem at least five lines long to describe or organization of matter by the arrangement of its atoms. Be sure to include both the names of the different types of matter as well as their meanings.
Gases, liquids and solids are all made up of atoms, molecules, and ions, but the behaviors of these particles are different in the three phases. Gases are well separated without a regular arrangement. Liquid on the other hand are close together with no regular arrangement. Solid are tightly packed and has a regular pattern.
What is matter?Matter is anything that has weight and occupies space.
All matter are made up of gas, liquid or solid. Gases are well separated without a regular arrangement. Liquid on the other hand are close together with no regular arrangement but takes the shape of the container. Solid are tightly packed and has a regular pattern.
In conclusion, all matter has mass and occupies space. All physical objects are made of matter.
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9)
Solve the question above:
A car with a 14-gallon gas tank gets 22 mpg gas mileage. How far can the car travel on a full tank of gas?
distance traveled on a full tank = ? miles
A car with a 14 gallon gas tank get 22 mpg gas mileage. The distance traveled by a car on full tank is 308 miles.
capacity of car tank = 14 gallon
mileage of car = 22 mpg ( miles per gallon )
distance traveled on a full tank = ?
to find out the distance traveled by a car on full tank of gas,
distance traveled on full tank = capacity of car tank × mile per gallon
= 14 gallon × 22 miles / gallon
= 308 miles.
Thus , A car with 14 gallon gas tank get 22 mpg gas mileage. the distance traveled by a car on a full tank of gas is 308 miles.
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For the amino acid alanine, the major species in solution at ph 7 is the zwitterionic form, which has a negatively charged carboxylic acid group and a positively charged amino group. There is a less common neutral form in which neither group is charged. The carboxylic acid group of alanine has a pka of 3. The amino group of alanine has a pka of 8. Estimate the ratio of the concentration of the neutral amino acid species to the zwitterionic species at ph 7.
The ratio between the neutral and the zwitterionic form of alanine at pH 7 is 1:100000.
Since the carboxylic group has a pKa of 3, that means that at pH 3 the ratio between its protonated and deprotonated (charged) form is 1:1. The difference between pH 7 and pH 3 is 7 - 3 = 4, which means that (because pH is a negative logarithm), pH 7 is 10000 times more basic than pH 3. This implies that the ratio between the protonated and the deprotonated form of the carboxylic group is 1:10000.
A similar calculation can be applied to the amino group. 8 - 7 = 1, so at pH 7, the ratio between its protonated (charged) and deprotonated form will be 10:1.
We then multiply these two ratios to get a ratio of neutral:zwitterionic = 1:100000.
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Which species has two more neutrons than electrons?
The species that has two more neutrons than electrons are ₂₀⁴⁰Ca²⁺ and ₁₁²³Na⁺ has two more neutrons than electrons; option C and D
What are the fundamental particle in an atom?The fundamental particles in an atom are the particles which make up the atom.
An atom is composed of three fundamental particles:
protonsneutrons, andelectronsThe number of protons in atom is the atomic number of the element.
The number of neutrons in atom is the difference between the mass number and atomic number of the atom.
For the given species;
₃⁶Li⁺:
number of protons = 3;
number of neutrons = 6 - 3 = 3
number of electrons = 3 -1 = 2
₄⁹Be²⁺:
number of protons = 4;
number of neutrons = 9 - 4 = 5
number of electrons = 4 -2 = 2
₁₁²³Na⁺:
number of protons = 11
number of neutrons = 23 - 11 = 12
number of electrons = 11 -1 = 10
₂₀⁴⁰Ca²⁺:
number of protons = 20
number of neutrons = 40 - 20 = 20
number of electrons = 20 -2 = 18
Therefore, ₂₀⁴⁰Ca²⁺ and ₁₁²³Na⁺ has two more neutrons than electrons.
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If a saturated open chain hydrocarbon has 15 carbon atoms, how many hydrogen atoms are present?
32 hydrogen atoms are present in a saturated open chain hydrocarbon has 15 carbon atoms.
Saturated hydrocarbons have only single bonds between carbon atoms.
The carbon atoms are saturated with hydrogen as many hydrogen atoms as possible.
Alkanes are saturated hydrocarbons.
General formula for alkanes is CₓH₂ₓ₊₂.
x is the number of carbon atoms in hydrocarbon.
x = 15; the number of carbon atoms in the hydrocarbon
The number of hydrogen atoms in the hydrocarbon = 2 × 15 + 2
The number of hydrogen atoms in the hydrocarbon = 32
Hydrocarbons can form open chains, branched chains and rings.
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Which of the following are a type of scientific model?
a. Mathematical
b. Physical
c. Conceptual
d. All of the above
Answer:
Physical
Explanation:
According to kinetic molecular theory At a temperature of a confined Gas rises which of the following characteristics of the gas molecules increase
A lot of the fundamental ideas of thermodynamics were established with the help of the kinetic theory of gases, a straightforward yet historically significant classical model of the thermodynamic behavior of gases.
According to kinetic molecular theory At a temperature of a confined Gas rises which of the following characteristics of the gas molecules increase
The macroscopic characteristics of gases, such as volume, pressure, and temperature, as well as their transport characteristics, such as viscosity, thermal conductivity, and mass diffusivity, are all explained by the kinetic theory of gases. The model also takes into consideration associated phenomena like Brownian motion.
According to the kinetic molecular theory, collisions between gas particles happen in a way that is completely elastic. Consequently, as the temperature rises, the speed at which the gas molecules move also does so. First, the gas molecules' conviction energy rises more quickly. The faster the molecules move, the more frequently they will crash with the container's walls, raising the gas pressure.
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If it takes 1.25 min for 0.010 mol of he to effuse, how long will it take for the same amount of ethane (c2h6) to effuse?
It will take 3.43 minutes for the same amount of ethane to effuse.
t(He) = 1.25 min; time of helium to effuse
M(He) = 4 g/mol; molar mass of helium
M(C₂H₆) = 30 g/mol; molar mass of ethane
rate of effusion of helium = 1/√M(He)
rate of effusion of helium = 1/√4
rate of effusion of helium = 0.5
rate of effusion of ethane = 1/√M(C₂H₆)
rate of effusion of ethane = 1/√30
rate of effusion of ethane = 0.182
rate of effusion of helium : rate of effusion of ethane = 0.5 : 0.182
rate of effusion of helium : rate of effusion of ethane = 2.74
t(C₂H₆) = 1.25 min × 2.74
t(C₂H₆) = 3.43 min
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Why don’t hydrogen ions appear in equation for half reaction occurring in basic solution
In a basic solution, the hydrogen ions do not appear in equation for half reaction.
What is a redox reaction?A redox reaction is one that involves the loss or gain of electrons. The electrons that are lost in one half equations are gained in the other half equation hence the process is synchronous. The electrons do not disappear in the process.
It is usual in some cases to use hydrogen or hydroxide ions to balance the atoms in the half equations. This occurs when the reaction is taking place in an acidic or a basic solution.
When the reaction takes place in a basic solution, there are no hydrogen ions present but only the hydroxide ions are present. Thus in a basic solution, the hydrogen ions do not appear in equation for half reaction.
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Which molecule is more soluble in water?
ch3ch2och3 (g) ch3ch2och2ch3(l) ch3ch2och3 (g) ch3ch2och2ch3(l) both are the same solubility
Of the two ether molecules given, ethyl methyl ether is the smaller molecule and thus more soluble in water. Diethyl ether has a larger molecule compared to ethyl methyl ether. CH₃CH₂OCH₃ is more soluble in water
Methyl ether is slightly more polar than diethyl ether. Methyl ether is much more volatile
Chemical compounds are classified based on the groups that exist within the compound known as functional groups. Ether is one of the functional groups of the form ROR', where the two alkyl groups can be the same or the two alkyl groups can be different.
He is given two structures, CH3CH2OCH2CH3 and CH3CH2OCH3. One is diethyl ether and the other is ethyl methyl ether. The two structures contain oxygen atoms, thus participating in hydrogen bonding.
Therefore, the solubility of a compound depends on its molecular size. The smaller the molecular size, the greater the solubility of the compound in water.
Of the two ether molecules given, ethyl methyl ether is the smaller molecule and thus more soluble in water. Diethyl ether has a larger molecule compared to ethyl methyl ether.
CH3CH2OCH3 is more soluble in water than CH3CH2OCH2CH3.
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A potential energy function is given by u(x) = (3.00 n/m)x - (1.00 n/m3)x3. at what position or positions is the force equal to zero?'
The position at which force is equal to 0 is +1 and -1.
The potential energy of the function is U.
U = 3x + 1 x²
Force is F.
F = 0
[tex]F = \frac{ - dU}{dx}[/tex]
[tex]F= \frac{ - d(3x + 1x ^{2} }{dx} [/tex]
= ( -3 - 3 x²)
= -3 ( 1+ x²)
As the force is zero.
The position at which force is equal to 0 is,
0 = -3 ( 1 + x ²)
[tex]x = \sqrt{ 1} [/tex]
x = 1
Therefore, the position at which force is equal to 0 is +1 and -1.
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A medication order states, administer meperidine hydrochloride 50 mg im stat. available is meperidine hydrochloride injection 100 mg/ml. how many ml should the nurse administer?
The nurse should administer 0.5ml of meperidine hydrochloride injection.
Meperidine hydrochloride is an analgesic drug which acts on the central nervous system used for the treatment of moderate to severe pain which requires opioid treatment. It is a very strong pain killer and sometimes has severe side effects like mood swings, nausea, etc. it may also lead to addiction and thus needs to be taken only in the dosage prescribed by a physician.
Given:
Stock concentration: 100mg/ml
Working concentration: 50mg
To find:
Volume = ?
Formula:
Volume = Working concentration / stock concentration
Calculations:
Volume = 50 / 100
Volume = 0.5ml
Result:
0.5ml of the meperidine hydrochloride injection should be administered by the nurse.
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An atom in its ground state contains 18 electrons. how many of these are in orbitals with ml = 0?
There are 6 electrons present in the orbital containing (ml=0).
Let the element be X. Now its electronic configuration will be
For 's' orbital the value of l = 0
X(18) = 1s^2, 2s^2, 2p^6, 3s^2, 3p^6
With this electronic configuration, three sublevels are present for the 's' orbital which are 1s^2, 2s^2, and 3s^2 respectively.
Now, let's calculate the electrons in the 's' orbital with l = 0
1s^2, 2s^2, 3s^2 = 2 + 2 + 2
1s^2, 2s^2, 3s^2 = 6
Thus, an atom containing 18 electrons in its ground state has 6 electrons.
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