Answer:1s2
Explanation:
Dosage calculation order: 3 mg available: 2 mg per 6 ml how many ml will be given?
9ml will be given for the case of dosage calculation order: 3 mg available: 2 mg per 6 ml
Conversion factors are necessary for dosage calculation, such as when translating from pounds to kilograms or liters to milliliters. This approach, which is straightforward in design, enables physicians to deal with different units of measurement and convert factors to arrive at the solution.
dosage calculation techniques serve as a second or third check on the accuracy of the previous computation techniques. Dimensional Analysis, Ratio Proportion, and Formula or Desired Over Have Method are the three main approaches for dosage calculation. dosage calculations are frequently prescribed and labeled based on their weight or, for solutions, their strength, which is the amount of weight dissolved or suspended in a given volume.
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Sodium has a density of 0.968 g/cm3 and crystallizes with a body-centered cubic unit cell. Part A Calculate the radius of a sodium atom.
The radius of a sodium atom is determined as 2.145 x 10⁻⁸ cm.
What is body-centered cubic unit cell?
Body-centered cubic (BCC) is the name given to a type of atom arrangement found in nature.
A body-centered cubic unit cell structure consists of atoms arranged in a cube where each corner of the cube shares an atom and with one atom positioned at the center.
Volume of the sodium atomThe volume of the sodium atom is calculated as follows;
V = ZM/Nρ
where;
Z is 2 for a body-centered cubic unit cellM is mass of sodium atom = 23 g/molρ is density of sodium atomN is Avogadro's numberV = (2 x 23) / (6.023 x 10²³ x 0.968)
V = 7.89 x 10⁻²³ cm³
Edge length of the unit cella = (V)^¹/₃
a = (7.89 x 10⁻²³ cm³)^¹/₃
a = 4.29 x 10⁻⁸ cm
Radius of the unit cellr = a/2
r = ( 4.29 x 10⁻⁸ cm) / 2
r = 2.145 x 10⁻⁸ cm
Thus, the radius of a sodium atom is determined as 2.145 x 10⁻⁸ cm.
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Explain why a glucose test strip may be used to determine the enzymatic activity of lactase
The glucose test strip may be used in the determination of the enzymatic activity of lactase
Since measuring the amount of generated glucose shows that the enzymes are actually converting the disaccharide into galactose and glucose, the glucose test strip can be used to determine the enzymatic activity of lactase.
As a byproduct of lactase hydrolysis, glucose serves as a direct indicator of the amount of lactase that has been reacted. Utilizing test strips that gauge the amount of glucose present in the reaction mixture, you can keep an eye on the enzyme activity.
An artificial substrate for lactase is hydrolyzed to extract lactase from dietary supplement tablets, which is then measured using a colorimetric assay (ortho-nitrophenol-beta-D-galactopyranoside, ONPG)
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List the procedural steps, from start to finish, that are required to convert 2‑naphthol and allyl bromide into allyl 2‑naphthyl ether.
Catalysis is the process of boosting the pace of a chemical reaction by using a catalyst. Catalysts are not consumed in the reaction and so survive it.
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For the energy diagram of the chemical reaction depicted here, which statement is the best conclusion?
The reaction is endothermic.
The reaction is endothermic.
The reaction will proceed without the input of energy.
The reaction will proceed without the input of energy.
The reaction is exothermic.
The reaction is exothermic.
The activation energy is not represented on the graph.
The reaction shown here is an exothermic reaction.
What is an exothermic reaction?An exothermic reaction is one in which the energy of the reactants is greater than the energy of the products. This implies that energy is given out in the process. Whether a reaction is endothermic or exothermic shows in the nature of the reaction profile curve.
For an endothermic reaction, the part of the diagram that represents the energy of the products is higher than the part that represents the energy of the reactants. This is clear from the image attached here.
If we look at the reaction graph very well, we will observe that the energy of the reactants is far above that of the products. Thus it follows that the reaction shown here is an exothermic reaction.
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Identify the substance that conducts electricity. question 19 options: 1) nacl dissolved in water 2) solid nacl 3) solid sugar 4) sugar dissolved in water
The substance that conducts electricity is [tex]NaCl[/tex] dissolved in water.
So, option A is correct one.
When the sodium chloride dissolve in water , the sodium atoms and chlorine atoms separates under the presence of water molecules and exist as sodium cation and chloride anion . Now , they are free to move around in the water as positively and negatively charged ions . This separation of charge allows the solution to conduct electricity.
The solid [tex]NaCl[/tex] and solid sugar does not conduct electricity because it is not dissolve in water . Similarly, sugar dissolved in water does not conduct electricity .
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The atmospheric layer in which gases do not maintain a uniform composition is the ________.
The layer of the earth's atmosphere in which gases do not maintain a uniform composition is the Heterosphere.
Heterosphere is simply the layer of an atmosphere in which the gases are split out according to molecular diffusion with an increase in altitude. Therefore, lighter species become more abundant than heavier species.The main components of the heterosphere are oxygen, helium, nitrogen, and hydrogen.
The lower layer is composed of nitrogen and oxygen.In the lower layers of the heterosphere, heavy molecules & atoms are present but lighter ones are present in the upper layer. According to Solar and temperature activities, the boundary between the molecules ranges. The heterosphere lies above the homosphere.
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What is the electron configuration of a potassium ion when it has formed an ionic bond with a bromine ion?
[2.8.2] - exists the electron configuration of a potassium ion when it contains created an ionic bond with a bromine ion.
What is electron configuration simple definition?
electronic configuration, also called electronic structure or electron configuration, the arrangement of electrons in orbitals around an atomic nucleus.
What are the 4 types of electron configuration?
The four different types of orbitals (s,p,d, and f) have different shapes, and one orbital can hold a maximum of two electrons. The p, d, and f orbitals have different sublevels, thus can hold more electrons. As stated, the electron configuration of each element is unique to its position on the periodic table.Learn more about electron configuration
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A gas at constant volume has a pressure of 4. 50 atm at 200k. What will be the pressure of the gas at 250k?
There will be 5.625 atm pressure of the gas at 250 K when a gas at constant volume has a pressure of 4. 50 atm at 200 K
According to gas law at constant volume the pressure of a given gas is directly proportional to the kelvin temperature .
[tex]P_{1} =T_{1}[/tex] (i)
[tex]P_{2} = T_{2}[/tex] (ii)
Where P and T is the pressure and temperature
Divide equation ( i ) by equation ( ii ) we get
[tex]P_{1}/P_{2}[/tex] = [tex]T_{1}/T_{2}[/tex]
Now putting the value of all given data in above final equation then we get.
4. 50 atm/[tex]P_{2}[/tex] = 200K/250K
[tex]P_{2}[/tex] = 4. 50 atm × 250K/ 200K = 5.625 atm
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Two gases are placed in a sealed flask and allowed to react. Which statement is true about the concentrations of the reactants and products when this closed system reaches dynamic equilibrium?
They will not necessarily be equal, but they will be constant.
What is dynamic equilibrium?In reversible reactions, dynamic equilibrium refers to a state in which the rate of the forward reaction is equal to that of the backward reaction.
Consdier the reaction below: A + B --> C + D
If the reaction is in dynamic equilibrium, the rate of formation of A and B will be the same as the rate of formation of C and D. However, this does not mean that the concentrations of the reactants and the products will be the same.
Since the rate of forward and backward reactions are equal, it means that the concentration of each of the species will be constant.
Thus, the above reaction is applicable to that of two reacting gases placed in a sealed flask and allowed to reach a dynamic equilibrium.
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They will be equal and constant. They will be equal but continuously changing. They will not necessarily be equal, and they will be continuously changing. They will not necessarily be equal, but they will be constant.
What is the maximum number of moles of so3 that can be produced by the reaction of 2. 0 mol of s with of o2?
The maximum number of moles of SO₃ that can be produced by the reaction of 2.0 mol of S with of O₂ will be 2, two moles.
What are moles?Moles are the quantity of a material in per unit of solution. It is the SI unit of amount of a substance. The moles can be calculated by dividing the molecular weight of an object with the molecular mass of the substance.
The balanced reaction is
2SO₂ +O₂ →2SO₃
The ratio is 2:1
So if 2.0 mol of sulfur will reaction with 1 mole of oxygen there will be 2 moles of SO₃. The reaction clears the moles of SO₃ in the reaction.
Thus, maximum number of moles of SO₃ will be 2.
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In state n = 1, the energy of the hydrogen atom is -13. 58 ev. what is its energy in state n = 2?
In state n = 1, the energy of the hydrogen atom is -13. 58 ev, then the energy in state n = 2 is -3.40eV.
For an electron located in an inner orbit to jump an upper orbit, it needs an energy equal to the difference between the two quantized orbits. This energy comes from the absorption of a photon with the same energy required. The formula for the energy levels of a Hydrogen atom is:
En = E/(n×n)
where E is the energy of the ground state and n is the energy level or state. Then the energy in n= 1 is
En = -13. 58/ 4
En = -3. 40eV
Thus, we find the value of energy of hydrogen atom in n=2 is -3. 40eV.
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Unless otherwise instructed, you may use the periodic table in the Chemistry: Problems and Solutions
book for this test.
Which statement is true about elements in a period on the periodic table?
O They have different properties that show no pattern.
O They have different properties that repeat across the next period.
O They have similar names.
O They have similar properties.
Elements in a period on the periodic table have different properties that repeat across the next period.
Why do properties change across a period?
In a period, on moving from left to right across a period,number of valence electrons in the valence shell goes on increasing as electrons are added to the same shell.
Across a period as no new valence shell is added the elements in a period, have different valence electrons and hence different properties.
Elements belonging to the same group have same number of valence electrons because in a group in every successive element a new shell is added,valence electrons present in which remain the same and hence their properties are similar.
As the elements are arranged in a way such that their properties are repeated at regular intervals,elements in a period have different properties which repeat across the next period.
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What type of bond will typically form between boron and hydrogen based on their electronegativity?
The type of bond will typically form between boron and hydrogen based is boron-hydrogen-boron bridge bond also known as 3 centered two electron bond on the basis of their electronegativity.
What is electronegativity?Electronegativity is a tendency or chances of an element to accepts the single electron from any atom not only the lone pair of electrons.
Fluorine is smallest and the highly electronegative element of the periodic table after that oxygen is also an electronegative element after that nitrogen.
Therefore, it is known as 3 centered two electron bond on the basis of their electronegativity.
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The compound
is classified as a
Explanation:
secondary amine bro go leaen
What is the equilibrium expression for
2SO3(g) 0₂(g) +2SO₂(g)
Answer:
[tex]K_{c} =\frac{[O_{2} ] [SO_{2} ]^{2} }{[SO_{3} ]^{2} }[/tex]
Explanation:
To construct the equilibrium constant, you need the balanced equation:
2 SO₃(g) -----> O₂(g) + 2 SO₂(g)
The equilibrium constant compares the concentrations of the products and the reactants.
The given expression follows this structure:
aA(g) ----> bB(g) + cC(g)
In this equation, the uppercase letters symbolize the molecules and the lowercase letters symbolize their corresponding coefficients in the balanced equation.
The general equilibrium expression looks like this:
[tex]K_{c} =\frac{[B]^{b} [C]^{c} }{[A]^{a} }[/tex]
To be clear, the concentrations in the numerator represent the gaseous products and the concentrations in the denominator represent the gaseous reactants.
Therefore, the equilibrium expression for this equation is:
[tex]K_{c} =\frac{[O_{2} ] [SO_{2} ]^{2} }{[SO_{3} ]^{2} }[/tex]
The _____ property allows the positioning of an element to the right or left of other elements.
Answer:
can u show the answer it give you for the question
The float property allows the positioning of an element to the right or left of other elements.
In the context of web development and CSS, the "float" property is used to control the positioning of elements within a container. It allows you to move an element to the left or right of its containing element, enabling other elements to flow around it.
When an element is floated, it is taken out of the normal flow of the document, allowing other elements to wrap around it. This can be particularly useful for creating layouts where you want elements to appear side by side or to create text flow around images.
The "float" property can take one of two values: "left" or "right". When an element is set to "float: left", it will move to the left of its containing element, and any subsequent elements will wrap around it on the right side. Conversely, when set to "float: right", the element will move to the right, and subsequent elements will wrap around it on the left side.
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An element with the general electron configuration for its outermost electrons of ns2np1 would be in which element group?
Electron configuration is the electron distribution in the molecular and atomic orbital. An element with configuration ns²np¹ will be in the 3A group. Thus, option B is correct.
What is electronic configuration?The electronic configuration has been the arrangement and distribution of the sub-atomic particle, an electron in the atomic shells.
The electronic configuration given is, ns²np¹. Here, there are three valence electrons in the outermost orbit. As it has been known that the number of the valence electron gives the number of the group.
Therefore, option B. 3A group or 13 group is the correct option.
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Your question is incomplete, but most probably your full question was, An element with the general electron configuration for its outermost electrons of ns2np1 would be in which group?
a. 2a
b. 3a
c. 4a
d. 5a
e. 8a
As filtrate moves down the loop of henle, the surrounding interstitial fluid becomes _____ concentrated than the filtrate, so _____ leaves the filtrate.
As filtrate moves down the loop of Henle, the surrounding interstitial fluid becomes more concentrated than the filtrate, so water leaves the filtrate.
The average rate of a reaction is a good approximation of an instantaneous rate when?
The average rate of a reaction is a good approximation of an instantaneous rate when the concentration is measured during relatively brief time intervals.
At any point during such a little period, the average rate will be extremely near to the instantaneous rate. The average rate will differ from the instantaneous rates inside the period more when time intervals are longer.
The concentration change during a chosen time period is the average rate. When you take the measurements makes a difference.
The rate at a specific moment is known as the instantaneous rate. Finding the slope of the tangent to the concentration vs. time curve at that point yields the answer.
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Why do you add hydroxide to your hexanediamine solution? what would occur if you did not add it?.
In order to react with the hydrochloric acid (HCl) created when the hexanediamine combines with the adiptic acid, NaOH was added to the hexanediamine solution. By combining with the HCl to create NaCl and water, the NaOH preserves the pH of the solution. HCl is taken out of the solution and the reaction is pushed in the direction of the products.
Hexanediamine solutionA C6 alkane-alpha, omega-diamine is hexanediamine. It serves as a xenobiotic metabolite for humans. It comes from a hydride.
Weight in Formula: 116.21Indication: 1,6-NH2(CH2)6NH2Risk Information: CorrosiveDensity: 0.854 (g/mL).Heat of Boiling (°C): 205Temp. Freeze (°C): 39–42Water and Alcohol Are Both Slightly SolubilizedSynonyms include 1,6-diaminohexane and hexamethyleneediamine.Shelf Life: 36 monthsWhat is the purpose of hexanediamine?
Hexanediamine is mostly used to make adhesive resins, resins for paper manufacturing, resins for water treatment, and unaltered resins. Hexanediamine is only used in industrial products; it is unlikely that consumers will come into touch with it.learn more about hexanediamine solution here
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I’ll mark u brainliest!!
What is the ph of a 2. 3 m solution of the weak acid h2s, with a ka of 1. 19×10−7? the equilibrium expression is: h2s(aq) h2o(l)⇋h3o (aq) hs−(aq)
The equilibrium expression is:
H2S (aq) + H2O (l) ⇋ H3O (aq) + HS (aq)
In order to calculate the pH of equation having aqueous solution of weak acid H2S, let’s assume that molar concentration of the products H3O and HS total released is ‘a’. Now as per given information concentration of weak acid H2S is 2.3 M. Thereby,
Ka = [H3O+] [HS] / [H2S]
1.19 x 10-7 = [a] * [a] / [2.3]
a2 = 1.19 x 10-7 x 2.3
a = 5.24 x 10-4
As per the calculation, the total concentration of the products released (HS) and (H3O) will be 5.24 x 10-4, on that basis, the pH of the weak acid (H2S) can be calculated as follows:
-log (0.000522494) = 3.28
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What does the duct calculator tell a technician about static pressure and airflow?
Answer:
It displays the static pressure loss over a length of 100 feet for a specific duct size and airflow.
What is a ductulator?People who work in the HVAC and construction industries use ductulators to size the ductwork in mechanical systems. It enables you to select the volumetric flow rate after selecting the static pressure you wish to keep in the duct. The ductulator offers you a wide range of rectangular duct diameters that will create this when you enter those criteria. It also displays the required diameter for a circular duct. The actual instrument is constructed of sturdy, thick paper, and it contains a rotating piece that lets you select the two settings I previously indicated.
A spherical balloon is inflating with helium at a rate of 48π ft3 min. How fast is the balloon's radius increasing at the instant the radius is 2 ft?
Answer:
Explanation:.
Sodium and bromine form an ionic bond. The resulting compound, sodium bromide, is held together because...
Select one:
a. oppositely charged ions attract.
b. electrons are shared.
c. protons stay in the nucleus.
d. positively charged ions attract.
[tex] {\qquad\qquad\huge\underline{{\sf Answer}}} [/tex]
Sodium is a highly reactive alkali metal and it looses an electron to gain a positive charge on it and bromine is a halogen that is highly resctive as well and it gains a negative charge by doing so.
And hence they form ionic bond, and the compound is held together by the attraction between the two charged ions.
So, correct choice is : A. oppositely charged ion attract.
What is the molar mass of a gas if a flask with a volume of 3. 16 l contains 9. 33 grams of the gas at 32. 0°c and 1. 00 atm?
The molar mass of a gas if a flask with a volume of 3. 16 L contains 9. 33 grams of the gas at 32. 0°C and 1. 00 atm is 1.17g/mol
Calculation ,
In this question we have to fist find the number of moles of gas by using ideal gas equation and from the help of number of moles we can determine molar mass.
According to ideal gas equation which is also known as ideal law ,
PV = nRT ...( i )
where P is the pressure of the gas = 1 atm
V is the volume of the gas in the flask with volume = 3. 16 L
R is the universal gas constant = 0.082 atm L/K mol
T is the temperature = 32. 0°C = 32 + 273 = 305 K
n is the number of moles = ?
Putting the value of Pressure P , volume V , temperature T , number of moles n and universal gas constant R in the equation (i) we get ,
1 atm ×3. 16 L = n× 0.082 atm L/K mol ×305 K
n = 1 atm ×3. 16 L / 0.082 atm L/K mol × 305 K = 0.126 mole
number of mole of a gas = 0.126 mole = given mass/ molar mass
molar mass = number of moles × Given mass = 0.126 × 9. 33 = 1.17g/mol
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What two properties (one chemical and one physical) combine to make bromcresol green useful as an acidity indicator?
Two properties are :
Bromcresol green is useful as an acidity indicator because it changes to yellow as the pH becomes more acidic
Also, the bromcresol green protons are easily dissociated making the color change visible and relatively quick.
Why is bromocresol green used as an indicator?
Bromocresol green (BCG) is a dye of the triphenyl methane family (triarylmethane dyes). It belongs to a class of dyes called sulfonephthaleins. It is used as a pH indicator in applications such as growth mediums for microorganisms and titrations.
How does a pH indicator work?
pH indicators detect the presence of H+ and OH-. They do this by reacting with H+ and OH-: they are themselves weak acids and bases. If an indicator is a weak acid and is colored and its conjugate base has a different color, deprotonation causes a color change.
What is chemical change and physical change?
Physical changes are reversible and do not produce a new substance. Chemical changes result in the production of a new substance and cannot be reversed.
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A solution containing a buffer has an initial ph of 8.78. If a student adds 5 drops of hcl(aq) to this solution. What would be a reasonable ph for the resulting solution?
Buffer is a solution that has been known to have an acid and base dissolved with constant hydrogen concentration. If 5 drops of HCl are added to the buffer then the final pH will be 8.64. Thus, option a is correct.
What is pH?pH has been the concentration that is made of hydrogen or proton ions. The ions have been known to be released from the acids while the bases release the hydroxide ions.
The given buffer has a pH of 8.78, and hence, it is a basic buffer. If the solution of HCl (strong acid) is added to this buffer then the pH will decrease definitely. As only 5 drops are added there will be not much decrease in the pH.
Therefore, option a. the pH of the buffer after addition to HCl will be 8.64.
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Your question is incomplete, but most probably your full question was, A solution containing a buffer has an initial pH of 8.78. If a student adds 5 drops of HCl(aq) to this solution. What would be a reasonable pH for the resulting solution?
8.648.787.008.895.22The discreteness of energy levels is best understood by considering the electrons to be?
The discreteness of energy levels is best understood by considering the electrons to be wave like.
This above can be explained on the basis of bohr model and wave mechanical theory.
According to bohr's atomic model, the angular momentum of electron orbiting around the nucleus is an integral multiple of h/2π.
The electron in the atom moving around the nucleus of an atom. The wave mechanical theory proposes that each electron revolving an atom's nucleus occupies a specific orbital and spins in a certain direction, but the orbitals is like a wave of energy.
The wave mechanical model proposed that the electron acts like particles as well as wave of energy. According to the field around, the electron changes there path and they start moving very fast act like wave of energy and hence they are not in place during any particular time.
Thus we concluded that electron revolve around central nucleus at such high speed that they act like wave of energy.
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