Answer:
A half life is the amount of time it takes for half of a mass of a given radioactive element to decay to something else. 36 days is 4 1/2 life cycles, so by running 1/2*4 , we get how much of the original substance would be left. That would be 1/16 of the original substance left.
Explanation:
Of course, this is not always perfect, and can vary. In addition, if less than 16 atoms of the original substance are present, there is instead a 1/16∗a chance of at least one remaining.
The amount of substance left after 39 days will be 1/16th of the original amount.
What is the half-life of a radioactive element?The half-life period of the radioactive material can be defined as the time required to reduce its actual amount to half after disintegration. The half-life period of a radioactive substance is independent of the initial amount of the substance.
Consider that N₀ is the initial amount of the substance
Consider that 'n' is the number of half-lives of given substance.
The time for which substance decay, t = 36 days
Half-life of substance (t½) = 9 days
t = n ×t½
36 = n × 9
n = 4 days
Assume that N is the amount of the substance after decay for 39 days.
N ×2⁴ = N₀
N × 16 = N₀
N = N₀/16
Therefore, one-sixteenth of the initial amount of the substance will be left after 39 days.
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1. A dog with a mass of 3.5 kg goes for a run at a pace of 1.4 m/s. What is the
dog's kinetic energy?
The weather news gives the atmospheric pressure as 1.07 atm. What is this atmospheric pressure in mm Hg?
813.2 torr was computed as the value.
Air pressure is the force of the air around us, whereas atmospheric pressure is the force of the earth's atmosphere. Tore gauges are used to measure air pressure, while mercury barometers are used to measure atmospheric pressure. The planet's gravitational pull on the gases above its surface produces atmospheric pressure, which depends on the planet's mass, the radius of its surface, the quantity, composition, and vertical distribution of the gases in the atmosphere.
Factor of conversion: 760 Torr per atm
Torr = 1.07 Atm 760
Torr = 813.2
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when two amino acid monomers are positioned so that the carboxyl group of one is adjacent to the amino group of the other, they can be joined through a
They can be joined through a Peptide bond
The amino acids serve as the foundation for proteins. Water is produced when the amino acids are linked to form a lengthy chain of acids via amino and carboxyl. The main protein is made up of these long chain amino acids.
When the carboxyl group of one molecule combines with the amino group of the other molecule, a molecule of water is released, and a peptide bond is created between the two molecules (H2O). This condensation event, sometimes referred to as a dehydration synthesis reaction, typically takes place between amino acids.
What is a Peptide bond ?The carboxyl group of one amino acid is joined to the amino group of another to produce a peptide bond, also known as a eupeptide bond. In essence, a peptide link is an amide-type covalent chemical bond.
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Is Fe+S classified as a mixture, an element, or a compound?
Is Fe+S classified as as compound
Iron and sulfur are both elements from the periodic table of elements each one has its own unique physical and chemical properties iron is a metal, and sulfur is a nonmetal. when these two are heated together, the iron atoms combine with the sulfur atoms to make a compound known as iron sulphide when iron and sulphur are mixed then the reaction is called as redox reaction or oxidation reduction reaction in that reaction Fe loses electron that is Fe is undergoing in oxidation and we know that the substance which itself undergo oxidation act as a reducing agent so in this case Fe is the reducing agent. Fe+S is a compound because compound means the substance made from two or more different element that have been chemically joined and mixture means made up of two or more chemical component that are not chemically joined called mixture so given iron sulphide is a compound.
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Phosphorus (P, #15) atoms bond with Chlorine (Cl, #17) atoms. What type of bond will hold them together? (1 pt)
*
1 point
ionic
covalent
metal
intermolecular (hydrogen, dipole, etc.)
predict the paths taken by ???? particles that are fired at atoms with a rutherford atom model structure. explain why you expect the ???? particles to take these paths.
The positive-positive repulsion is expected to slow the particles down slightly as they travel through the atoms since the plum pudding model predicts that the positive charge is distributed evenly throughout the atom. However, we do not anticipate any deflection of the particles.
According to the idea, an atom has a tiny, compact, positively charged center called a nucleus, where almost all of the mass is concentrated, while light, negatively charged particles called electrons orbit far around it, much like planets orbit the Sun.To explain the scattering of alpha particles from thin gold foil as shown in a series of experiments carried out by undergraduate Ernest Marsden in 1909 under the guidance of Rutherford and German physicist Hans Geiger, the nucleus was hypothesized to be small and dense. A lead shield was placed over a radioactive source that was generating alpha particles, which are positively charged particles that are 7,000 times more massive than electrons and identical to the helium atom nucleus.The Rutherford model was not accepted.
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the symbol for xenon (xe) would be a part of the noble gas notation for the element antimony. cesium.
The symbol for xenon (xe) would be a part of the noble gas notation for the element cesium.
For writing the electronic configuration of any element by using the preceding noble gas configuration, we simply use the symbols of noble gas belongs to the previous period of that particular elements. We can't use the symbol of noble gas of same period from which the element belong.
A is the wrong option because the noble gas in the preceding period to the period from which antimony belongs is krypton.
The actual electronic configuration of antimony is as follow:
[Kr] 4d10 5s2 5p3
B is correct option because the noble gas in the preceding period to the period from which Cesium belongs is Xenon.
The actual electronic configuration of Cesium is as follow:
[Xe] 6s1
Thus, we concluded that the symbol for xenon (xe) would be a part of the noble gas notation for the element cesium.
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an aqueous solution containing 17.5 g of an unknown molecular solute (a nonelectrolyte) in 100.0 g of water has a freezing point of −1.80 °c. what is the molar mass of the unknown compound? kf(water)
The nonelectrolyte is a substance that has been known to not ionize in an aqueous solution. The molar mass of the unknown compound at the freezing point of −1.80 ° C is 180.833 g/mol.
What is the freezing point?The freezing point has been the estimate of the temperature at which the substance is said to change its phase from the liquid to the solid state. It is just the opposite of the melting point.
Given,
ΔTc = -1.8 °C
Kc water = 1.86 °C.Kg/mol
Mass solvent = 100.0 g = 0.1 Kg
Mass solute = 17.5 g
Mass of solution = mass of solute + mass of solvent = 117.5 gm
Molality (m) is calculated as:
molality = solute (mol) ÷ solvent (Kg)
m = ( - 1.8 °C) ÷ ( - 1.86 °C.Kg/mol)
m = 0.9677 mol/Kg
Molar mass can be calculated from molality as:
moles of solute = molality × solvent
moles = 0.9677 mol/Kg × 0.100 Kg H2O
= 0.09677 mol
Now, moles and mass are used to calculate molar mass as:
Molar mass = mass ÷ moles
= 17.5 g ÷ 0.09677 mol
= 180.833 g/mol
Therefore, the molar mass of the unknown substance is 180.833 g/mol.
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vWhich statements explain why rocks weather at different rates? Check all that apply.
Softer, porous, or more permeable rocks weather faster than harder rocks.
Rocks in warmer climates weather faster than rocks in colder climates.
Rocks with minerals that dissolve slowly in water will weather faster than other rocks.
The more water present, the faster the rate of weathering.
Rocks that are more permeable are more resistant to weathering.
The correct option is A. Softer, porous, or more permeable rocks weather faster than harder rocks.
What are the different types of rocks?Rocks are of different types such as metamorphic, igneous, and sedimentary rocks.
Rocks that are more pliable, porous, or permeable weather more quickly than tougher rocks. Rocks weather more quickly in hot regions than in chilly ones.
In comparison to other rocks, rocks having minerals that break down slowly in water will weather more quickly. The rate of weathering increases with the amount of water present.
Therefore, The correct option is A. Softer, porous, or more permeable rocks weather faster than harder rocks.
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EXPLAIN ONE REASON WHY COPPER WIRE WAS USED TO MAKE THE COPPER FLOWERS
Draw the structure of an alkane or cycloalkane that has more than three but fewer than ten carbon atoms, and only primary hydrogens.
Jenny experiences an average downward force of 441 N anywhere she goes
The mass of the object could now be obtained as 45 Kg.
What is gravity?We define the term gravity as the force that drags an object down to the center of the earth. We know that every object that is found on earth has a mass. The mass of the object means that it is acted upon by the force of gravity.
Again we can obtain the weight of the object as the influence of the gravitational force on an object. In fact we define the weight of the object as the gravitational force that acts on an object. As such, the gravitational force or the weight of the object is given in Newton’s.
Given that;
Weight = mass * acceleration due to gravity
Mass = Weight/ acceleration due to gravity
Weight of the object = 441N
Acceleration due to gravity = 9.8 m/s^2
Mass of the object = 441N/9.8 m/s^2
= 45 Kg
The mass of the object could now be obtained as 45 Kg.
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Complete the model of a sodium chloride crystal by dragging the chlorine and sodium atoms to their correct positions.
The model is completed by inserting the sodium and the chloride ions in alternate positions.
What is a model?It is common to show the arrangement of atoms or ions in a substance by the use of models. In the realm of science, a model could be used for the purpose of explanation or for the purpose of prediction. It is also possible to use a model as the way that we can be able to underscore and understudy the properties of a molecule.
Now we know that sodium chloride is an ionic compound. The ionic compounds are crystalline. This implies that the ions are arranged in a regular and a repeating pattern which enables the substance to have a definite shape as well as a high melting and a high melting point.
It then follows from the image that the ions of sodium and chlorine do occupy alternate positions in the solid in order to maximize the interaction between the ions. It then follows that the model is completed by inserting the sodium and the chloride ions in alternate positions.
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you have 3.8 kg of water. one mole of water has a mass of 18 g/mole and each molecule of water contains 10 electrons since water is h2 o. what is the total electron charge contained in this volume of water? the elementary charge is 1.6 × 10−19 c . answer in units of c.
The total electron charge contained in this volume of water is 8.565 x 10⁷c.
Equation :N total = N mole (10e⁻ / molecule) Nₐ
Nₐ = 6.022 x 10²³ molecules / mole
N mole = mass / molecular weight
= Vp / mol wt
= (1.6 × 10⁻¹⁹ c) (10³ kg /m³) / 18 g / mole (10⁻³ kg/g)
= 88.89 moles
N total = N mole (10e⁻ / molecule) Nₐ
N total = 88.89 moles (10e⁻ / molecule) (6.022 x 10²³ molecules / mole)
N total = 5.353 x 10²⁶e⁻
Q total = N Total (-e)
Q total = (5.353 x 10²⁶) (1.6 × 10−19 c )
Q total = 8.565 x 10⁷c
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in the titration of 230.0 ml of 0.4000 m honh₂ with 0.2000 m hbr, how many ml of hbr are required to reach the halfway point?
Titration has been the process to estimate the unknown volume by the known amount of the concentration and volume. 230 mL of HBr is required to reach the halfway point.
What is the dilution formula?The dilution formula can be used to estimate the unknown volume through the half-neutralization of the acid and base in the titration process. The final volume can be estimated by the known amount of HONH₂.
The formula is given as:
M₁V₁ = M₂V₂
Given,
Volume of HONH₂ (V₁) = 230 mL
Molar concentration of HONH₂ (M₁) = 0.4000 M = 0.2000 M
Molar concentration of HBr (M₂) = 0.2000 M
Volum of HBr = V₂
Substituting values as:
230 ml × 0.2000 M = 0.2000 M × V₂
V₂ = 230 mL
Therefore, 230 mL HBr is the volume at halfway point.
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A 2-column table with 4 rows. The first column labeled wave has entries W, X, Y, Z. The second column labeled Observations has entries its motion is perpendicular to wave motion, its particles move up and down, its particles only move small amounts, its motion is parallel to wave motion.
Which statement is best supported by the table?
Waves W and Y are transverse waves, Wave X could be a longitudinal or transverse wave, and Wave Z is a longitudinal wave.
Waves W and Y are longitudinal waves, Wave X could be a longitudinal or transverse wave, and Wave Z is a transverse wave.
Waves W and X are longitudinal waves, Wave Y could be a longitudinal or transverse wave, and Wave Z is a transverse wave.
Waves W and X are transverse waves, Wave Y could be a longitudinal or transverse wave, and Wave Z is a longitudinal wave.
The statement which is best supported by the table (see attachment) is: D. Waves W and X are transverse waves, Wave Y could be a longitudinal or transverse wave, and Wave Z is a longitudinal wave.
What is a wave?A wave can be defined as a disturbance in a medium that progressively transfers (transports) energy from a source to another location, especially without the transportation of mass (matter).
The types of wave.In Science, there are three (3) main types of wave and these include the following:
Longitudinal wave.Surface wave.Transverse wave.What is a longitudinal wave?A longitudinal wave is the opposite of a transverse wave and it can be defined as a type of wave that usually travel in the same direction of its oscillation. Thus, the motion of a longitudinal wave is parallel to wave motion.
What is a transverse wave?A transverse wave can be defined as a type of wave in which particles of the medium of propagation oscillates or vibrates (up and down) in a direction that is perpendicular to the direction that the wave moves i.e at right angle to the direction of propagation of the wave.
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Answer:
Waves W and X are transverse waves, Wave Y could be a longitudinal or transverse wave, and Wave Z is a longitudinal wave.
//D edge 2023//
Explanation:
sorry if im wrong , have a great day/night!
A claim supported by evidence.
ibuprofen c13h18o2 that is manufactured in michigan contains 75.69% by mass carbon, 8.80% hydrogen, and 15.51% oxygen. if you buy some ibuprofen for a headache while you are on vacation in germany, how do you know that it has the same percentage composition as the ibuprofen you buy at home?
Law of definite composition: As long as something has the same formula, its mass will be the same.
According to the Law of Definite Proportions, a chemical compound will always include the same weight proportions of each element, regardless of the quantity or source. For instance, 21.5 grammes of carbon and 28.5 grammes of oxygen make up a 50-gram sample of carbon monoxide.
What is Ibuprofen ?Ibuprofen is a medication used to treat pain, fever, and inflammation, and is a member of the nonsteroidal anti-inflammatory drug (NSAID) family. This includes menstruation pain, migraines, and rheumatoid arthritis. The patent ductus arteriosus of a premature newborn can also be sealed with this technique.
Ibuprofen is a painkiller that can be bought over-the-counter without a prescription. It is a member of the group of drugs referred to as non-steroidal anti-inflammatory drugs.Learn more about Ibuprofen here:
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comparison of methods for spectral alignment and signal modelling of gaba‐edited mr spectroscopy data
Comparison of techniques for GABA-edited MR spectroscopy data spectral alignment and signal modeling.
There are many ways to align and quantify magnetic resonance spectroscopy (MRS) data in order to assess -aminobutyric acid in vivo (GABA). Because there are few ground-truth measurements available, there is little research comparing the performance of different approaches. In comparison to white matter, the concentration of GABA is almost twice as high in grey matter.
Here, we assess the performance of four spectral alignment approaches (i.e., retrospective frequency and phase drift correction) and six GABA signal modeling methods using the percentage of grey matter present in the MRS voxel as a proxy for ground-truth GABA concentration.
The alignment to the creatine (Cr) signal generates GABA+ estimates that account for around twice as much of the diversity in grey matter as the next highest performing alignment approach, according to our analysis of a broad dataset of 432 MEGA-PRESS scans targeting several brain areas.
Additionally, Cr alignment produced the fewest outliers and was the strongest. As opposed to this, all signal modeling techniques—aside from the single-Lorentzian model—performed equally well.
Our findings indicate that rather than frequency originating from first-order phase offsets within subspectra, performance variability is predominantly caused by variances in the zero-order phase calculated by each alignment method.
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a 1.00-l solution contains 2.50×10-4 m cu(no3)2 and 1.20×10-3 m ethylenediamine (en). the kf for cu(en)22 is 1.00 × 1020. chegg
The concentration of copper in the solution is
[tex]5.1 \times 10^{18} \: M.[/tex]
The volume of the solution = 1.00 L
[tex]Moles \: of \:Cu(NO_{3}) _{2} = 2.50 \times 10 {}^{ - 4} [/tex]
[tex]Moles \: of \: Ethylenediamine = 1.20 \times 10.3[/tex]
[tex]k _{f} = 1.00 \times 10^{20} [/tex]
Overall balanced equation of reaction is,
[tex]Cu^{2 + }(aq) \: + 2en \: (aq)→ Cu(en) ^{2 + }_{2}(aq)[/tex]
[tex]Moles \: of \:Cu(NO_{3}) _{2} =0.00025 \: mol[/tex]
Mole ratio for,
[tex]Moles \: of\:Cu(NO_{3}) _{2}: en[/tex]
[tex]2: 1[/tex]
[tex]Moles \: of \: en = 0.000250 \times 2[/tex]
[tex] = 0.00050 \: moles[/tex]
Remained moles of en are= (0.00120-0.000500)
[tex] = 0.000700 \: moles[/tex]
The concentration of copper in the solution is,
[tex]k_{f} = \frac{Cu(en)^{2 + }_{2} }{Cu^{2+}en^{2} }[/tex]
[tex]1.00 \times 10 ^{20} = \frac{0.000250}{(Cu )^{2 +} \times (0.000700)^{2 + } }[/tex]
[tex] = 5.1 \times 10^{18} \: M.[/tex]
Therefore, the concentration of copper in the solution is
[tex]5.1 \times 10^{18} \: M.[/tex]
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Please help me with chemistry questions!
what is the difference between melting and fusion?
Melting occurs when a solid changes state into a liquid.
Fusion occurs when a liquid changes state into a solid.
(So, basically, they are opposite of each other)
Hope this helps!
Have an awesome day!
Use the atomic mass of lithium to calculate the relative abundances of the two isotopes.
Lithium has two isotopes. Lithium-6 has a atomic mass 6.01512 amu and Lithium-7 has a atomic mass 7.01601 amu. The average atomic mass of Lithium is 6.941 amu.
Let's take the relative abundance of Lithium-6 as X and the relative abundance of Lithium-7 as Y. The sum of the relative abundances is always taken to be 1.
X+Y=1
X=1-Y
The average atomic mass can be expressed as the following, based on the atomic masses and relative abundance of the two isotopes
6.941 = X(mass of Li-6) + Y(mass of Li-7)
6.941= 1-Y(6.01512) + Y(7.01601 )
from the above equation, Y=0.92506
Solving for X
X=0.07494
Therefore, the relative abundance of lithium-7 is 92.506% and that of lithium-6 is 7.494%
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you made ml of a lead(ii) nitrate solution for lab but forgot to cap it. the next lab session you noticed that there was only ml left (the rest had evaporated). in addition, you forgot the initial concentration of the solution. you decide to take ml of the solution and add an excess of a concentrated sodium chloride solution. you obtain a solid with a mass of g. what was the concentration of the original lead(ii) nitrate solution?
4.83 M is the concentration of the original lead.
DILUTED and CONCENTRATED SOLUTIONS:
A solution is diluted when more solvent is added so that the concentration is lowered, whereas a solution is concentrated when solvent is removed from the solution so that the concentration increases. The removal of solvent can be done by evaporation. Both these processes involve the a change in the volume of the solution to cause a change in the concentration of the solution. This means that the same tools can be used to determine the concentration of a concentrated solution as would be done if it was a diluted solution.
The balanced reaction equation is:
[tex]Pb(NO_3)_2 (aq) + 2NaCl(aq) \rightarrow PbCl_2(s) + 2NaNO_3(aq)[/tex]
The molar mass of lead (II) chloride is 278.106 g/mol. The number of moles of lead(II) chloride is:
[tex]n = \frac{3.451 g}{278.106g/mol}[/tex]
[tex]n = 0.01241 mol[/tex]
The ratio between lead (II) chloride and lead (II) nitrate is 1:1 which means there was 0.0124mol of lead (II) nitrate in the solution. The concentration of lead (II) nitrate is:
[tex]M = \frac{0.01241 mol}{0.00200 L}[/tex]
[tex]M = 6.20mol/L[/tex]
This means the concentration of lead (II) nitrate in the partially evaporated solution is 6.20mol/L. The concentration of the original solution is:
[tex]M_1 V_1 = M_2 V_2[/tex]
[tex]M_1 = \frac{M_2 V_2}{V_1}[/tex]
[tex]M_1 = \frac{(6.20 M)(0.0779 L)}{0.1000 L}[/tex]
[tex]M_1 = 4.83 M[/tex]
Thus, the concentration of the original lead is 4.83 M.
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Perform the following problem. Round your answer appropriately.
8.1456 - 5.12 =
The difference between 8.1456 - 5.12 will be 3.0256 and rounding it off will give 3.
How to subtract the numbers?It should be noted that the information given is that we should subtract 5.12 from 8.1456.
It should be noted that subtraction is used when we want to deduct a number from another number. It is taking away a number form another one.
In this case, we will take away 5.12 from 8.1456. This will give the difference between the numbers.
Therefore, 8.1456 - 5.12 = 3.0256
Therefore, the difference is 3.0256 and rounding it appropriately will give a value of 3.
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Bromine is in its liquid state at 25 °C. Explain what this tells you about its melting point and boiling point.
Explanation:
Bromine is a halogen in group VII A of the periodic table with atomic number 35,an atomic weight of 79.91, and a density of 3.12 Mg.In the solid state it forms a cubic crystal with a melting point of -72 C and boiling point of 58 C.
Bromine's liquid state at 25°C indicates melting point below 25°C and boiling point above 25°C.
The observation of bromine being a liquid at 25°C reveals important details about its melting and boiling points. Since it exists as a liquid at this temperature, it signifies that its current state is beyond its melting point.
Therefore, bromine's melting point is below 25°C. However, since bromine has not transitioned into a gaseous state at 25°C, it indicates that its temperature is still below its boiling point. This suggests that the boiling point of bromine lies above 25°C.
The relatively narrow temperature range between its melting and boiling points makes bromine unique among elements and allows it to exist as a liquid at room temperature.
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If a 1.5 L saucepan is heated from 22 degrees celsius to 100 degrees celsius, by what percentage will any gas in the pan increase in volume?
Explanation:
[tex] \frac{p1v1}{n1t1} = \frac{p2v2}{n2t2} (ideal \: gas \: equation) \\ \frac{v1}{t1} = \frac{v2}{t2} \\ convert \: degrees \: to \: kelvin \: \\ \frac{1.5l}{297k} = \frac{v2}{373k} \\ v2 = 1.88l \\ it \: increased \: by \: 80\%[/tex]
what is the maximum number of covalent bonds that an oxygen atom with atomic number 8 can make with hydrogen? question 4 options: 1 6 4 2
Maximum number of covalent bonds that an oxygen atom can make with hydrogen is 2.
the ground state electronic configuration of oxygen is 2s² 2p⁴ that means it has 6 electrons in its valence shell and require two electrons are required to complete its octate. Two bonds are created when an electron donor atom shares the two needed electrons with oxygen. The ability of two oxygen atoms to share valence electrons results in the creation of a double bond between the two atoms.There are no longer any empty orbitals in the octet of oxygen after it is complete. As a result, it is unable to accept more electrons or create more bonds.Therefore, Oxygen can only generate two bonds because it needs two additional electrons to complete its octet, after which it will run out of empty orbitals in which to receive additional electrons and create additional bonds.
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A child attending daycare is prescribed 750 mg of an antibiotic for 10 days. The drug may be dosed in several ways and is available in two concentrations. Which dosing regimen will the provider consider to best assure drug adherence? group of answer choices 375 mg of a 250 mg/5 ml solution po twice daily 250 mg of a 250 mg/5 ml solution po three times daily 250 mg of a 500 mg/5 ml solution po three times daily 375 mg of a 500 mg/5 ml solution po twice daily
The best kind of prescription for the child is 250 mg/5 ml solution po three times daily.
What is a dose?The term dose has to do with the quantity or amount of the drug that a patient is required take. We must know that a drug is a chemical and being a chemical, there must be a specified amount of it that has to be taken per day.
We know that the dose of the drug that is given to a patient is sometimes in proportion to the degree of symptoms that the patient is feeling. In this case, we can see that the drug is given in more than one dose. We now have to find out the correct dose of the drug that is required in this case.
Let us look at the drug, we are told that a child attending daycare is prescribed 750 mg of an antibiotic for 10 days. The best kind of prescription for the child is 250 mg/5 ml solution po three times daily.
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what is the mean of 35, 2, 33,25 70,75 40,42,12,15,7,44,20,25,3,65,62,
31 answer
trust me
what is the mean of 35, 2, 33,25 70,75 40,42,12,15,7,44,20,25,3,65,62,
its 31