Answer:
2.70 grams
Explanation:
78.54% of the compound is carbon, so in a 1 gram sample, there would be 0.7854 grams of carbon since 78.54% * 1 = 0.7854. Similarly, we multiple 78.54% by 3.44 to get the mass of carbon in a 3.44 gram sample.
78.54% * 3.44 = 0.7854 * 3.44 = 2.701776, but only leave 3 digits because otherwise it would be false accuracy
why are group O called inert gases
Answer:
They are called inert gases because they are stable and non-reactive. They have a full outer shell of valence electrons which gives them little tendency to participate in chemical reactions.
Explanation:
They are also know as the "noble" gases.
an ion with one more proton and two more neutrons as an atom of Ne-20 but the same number of electrons?
The ion is sodium ion.
What is the ion?An ion is obtained by the removal of an electron from an atom. An ion could be positively charged or negatively charged. If the ion contains more electrons than protons then it is positively charged and vice versa.
An ion is positive when electrons are lost and the ion is negative when electrons are gained. In a negative charge, the electron cloud spreads out and the ion becomes larger. When we have a positive ion, the ion is smaller than the neutral atom.
Now, we can see that neon has an atomic number of 20 thus it has 10 electrons. If the ion contains one more proton then the atomic number of the element is 11. We are told that it contains two more neutrons hence the mass number is 22.
Given that the both species have the same number of electrons thus the ion must be sodium ion.
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Lauric acid is an organic compound composed of 71.95% c, 12.08% h, and the rest oxygen. if 0.141 mol of lauric acid has a mass of 28.2 g, what are the empirical and molecular formulas of lauric acid? empirical formula:
If 0.141 MOL of Lauric acid has a mass of 28.2 g, the empirical formula of lauric acid is C₁H₂O₁. And the molecular formula of lauric acid is C₁₂H₂₄O₂.
What is the empirical and molecular formula?The empirical formula is the simplest whole number ratios of the moles of the compounds. They are the atoms present in the compound.
The molecular formula tells the total number of atoms present in the element of a compound.
The empirical formula of lauric acid is C₁H₂O₁. if 0.141 MOL of lauric acid weighs 28.2 g. Lauric acid's chemical formula is C₁₂H₂₄O₂.
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Body temperature is controlled by a negative feedback control system. the hypothalamus is the ________ for this system.
Body temperature is controlled by a negative feedback control system.
What is negative feedback?
In biological systems, a type of control known as negative feedback occurs when a process's output lowers its own stimulus. A common regulation mechanism in many biological responses is feedback. The body may regulate numerous aspects of its internal environment by permitting particular routes to be switched on and off. This is like turning a switch. Feedback enables a pathway's output to operate a switch. Negative feedback, often known as a "negative feedback loop," happens when a pathway's end product disables the corresponding metabolic step.
In order to maintain body temperature, the hypothalamus reacts to this information by directing nerve impulses to effectors. For instance, the hair erector muscles tighten up if we get too cold. As a result, a layer of air is trapped near to the skin, raising the skin hairs. Systematic negative feedback regulates body temperature.
Thus the hypothalamus is the vital organ for this system.
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Question 6 of 10
Which statements about velocity are true?
Check all that apply.
A. The symbol for velocity is .
B. For velocity, you must have a number, a unit, and a direction.
C. To calculate velocity, divide the change in the distance by time.
D. The SI units of velocity are m/s.
Answer:
A, C And B
Explanation:
mark me brainlest
Answer:
A.✅(maybe)
B.✅
C.✅
D.✅
Explanation:
For A. if the symbol is given then answer can be determined. If symbol is V then it's true, if other then false
The is the si unit that expresses the amount of substance. Specifically, it is defined as the amount of substance containing the same number of entities as the number of in exactly 12 g of carbon-12.
The mole is the si unit that expresses the amount of substance
It provides a specific measure of the number of atoms or molecules in a bulk sample of matter. A mole is defined as the amount of substance containing the same number of discrete entities (atoms, molecules, ions) as the number of atoms in a sample of pure 12C weighing exactly 12 g
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Which of the following correctly describes an oxidation-reduction reaction?
A.The element that is oxidized increases in electronegativity, and the element that is reduced decreases in electronegativity.
B.The element that is oxidized decreases in electronegativity, and the element that is reduced increases in electronegativity.
C.The element that is oxidized loses electrons, and the element that is reduced gains electrons.
D.The element that is oxidized gains electrons, and the element that is reduced loses electrons.
Answer:
C. The element that is oxidized loses electrons, and the element that is reduced gains electrons.
Explanation:
When an element is oxidized, it loses electrons. But when an element is reduced, it gains electrons. However, an oxidizing agent oxidizes something else, and gets reduced, therefore gaining electrons
What+is+the+molar+absorptivity+of+a+solute+that+absorbs+86%+of+a+certain+wavelength+of+light+when+the+beam+passes+through+a+1.0-cm+cell+containing+a+0.16+m+solution?
The molar absorptivity of the solute that absorbs 86% wavelength of light when the beam passes through a 1.0cm cell containing a 0.16M solution is 5.375 mol L⁻¹ cm⁻¹
According to Beer-Lambert law,
"The concentration of a solution may be determined by measuring its absorbance since there is a linear relationship between the concentration and the absorbance of the solution."
A = εbC ......(i)
Where A ⇒ Absorbance
ε ⇒ Molar absorptivity
b ⇒ Length of the light path
c ⇒ Concentration
Now, A = 86%
b = 1.0cm
C = 0.16M
From (i)
A = εbC
0.86 = ε × 1 × 0.16
0.86 = ε × 0.16
ε = [tex]\frac{0.86}{0.16}[/tex] mol L⁻¹ cm⁻¹
ε = 5.375 mol L⁻¹ cm⁻¹
Therefore, the molar absorptivity of the solute is 5.375 mol L⁻¹ cm⁻¹
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A teacher carried out a class demonstration on
diffusion similar to that using ammonia (M = 17)
and hydrochloric acid (M = 36.5) (Figure 1.21).
However, they replaced the ammonia with
methylamine (M, = 31), which reacts in a similar
way to ammonia (note that M, is the relative
molecular mass of the substance).
g water
a
Where would you predict the position of the
smoke ring to be in this experiment? Explain
your answer
One of the hydrogens in the NH3 is replaced in the first reaction by the methyl group, or -CH3. The NH3 can have more than one H substituted for it, therefore the final product frequently comprises a blend of methylamine, dimethylamine, and trimethylamine.
A halogenoalkane and ethanolic ammonia can be used in a nucleophilic substitution process to produce primary aliphatic amines like methylamine (CH3NH2).
NH3 + CH3Cl = HCl + CH3NH2
The process is challenging because any unreacted ammonia can react with the generated HCl:
NH3+HCl yields NH4Cl.
Since the N in CH3NH2 still has a single pair of electrons, it can act as a base and interact with the HCl that is created in one of the following ways:
CH3NH2+HCl becomes CH3NH3+Cl.
or as a nucleophile and react with any chloromethane that hasn't been reacted:
(CH3)2NH + HCl = CH3NH2 + CH3Cl
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4. anthraquinone contains only carbon, hydrogen and oxygen. when 4.8mg of anthroquinone is burned14.22mg of co2and 1.66mg of h2o are produced. the molar mass anthroquinone is 208g/mol. determine the molecular and empirical formula of anthroquinone.
The molar mass of anthroquinone is 208g/mol. The empirical formula of anthraquinone is C₇H4O₁. And the molecular formula of anthraquinone is C₁₄H₈O₂
What is the empirical and molecular formula?The empirical formula is only a ratio of the moles of the various chemicals expressed in whole numbers. They are the elements that make up the compound.
The total number of atoms of an element in a compound is indicated by the molecular formula. It is the total atoms.
Thus, the mpirical formula of anthraquinone is C₇H4O₁. And the molecular formula of anthraquinone is C₁₄H₈O₂.
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What is the composition, in atom percent, of an alloy that consists of 90.5 wt g and 9.5 wtu? the atomic weights for silver and copper are 107.87 and 63.55 g/mol, respectively.
The composition, in atom percent, of an alloy that consists 90.5 wt Ag and 9.5 wt Cu is 84.5% and 15.2%.
Here, the lever rule is used to determine the composition of co-existing phases which are, Ag and Cu, of an alloy.
The given data is :
Atomic weight of silver (Ag), M(Ag) = 107.87 g/molAtomic weight of copper (Cu), M(Cu) = 63.55 g/molWeight percent of silver (Ag), W(Ag) = 90.5 wtWeight percent of copper (Cu), W(Cu) =9.5 wtTo calculate composition of silver, expression used is,
C(Ag) = W(Ag) × M(Cu) x 100
( W(Ag) × M(Cu) + W(Cu) × M(Ag) )
Substituting the values in the above expression,
C(Ag) = ( 90.5 × 63.55 ) x 100
( 90.5 × 63.55 + 9.5 × 107.87 )
C(Ag) = 84.5%
To calculate composition of copper, expression used is,
C(Cu) = W(Cu) × M(Ag) x 100
( W(Ag) × M(Cu) + W(Cu) × M(Ag) )
Substituting the values in above expression,
C(Cu) = (9.5 × 107.87) x 100
( 90.5 × 63.55 + 9.5 × 107.87 )
C(Cu) = 15.2%
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1) how many grams are present in 29 kg?
2) how many millimeters are present in 2 meters ?
Answer:
1. there are 29,000 grams present in 29 kilograms
2. there are 2000 millimeters present in 2 meters.
check out this conversion table if you get stuck again! :)
Which d electron count can exhibit both high-spin and low-spin states in an octahedral complex?
d5 electron count can exhibit both high-spin and low-spin states in an octahedral complex
Electron is a free, open-source software framework developed and maintained by GitHub. This framework is designed to build desktop applications using web technologies rendered using a variant of the Chromium browser engine and a backend using the Node.js runtime environment.
Electrons are negatively charged subatomic particles that are free to (not) bond with atoms. Electrons bound to atoms are one of the three main types of particles within atoms. The other two are protons and neutrons. Electrons, protons, and neutrons together form the nucleus.
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A sample of nitrogen gas is contained in a piston with a freely moving cylinder. At 0°c, the volume of the gas is 371 ml. To what temperature must the gas be heated to occupy a volume of 557 ml? report your answer in degrees celcius to the nearest whole number.
The final temperature of the gas is 137°C at which it must be heated to occupy the volume of 557 ml.
Given,
V₁= 371ml
V₂ = 557 ml
T₁ = 0°C or 273 okay
We ought to locate the very last temperature of the fuel that must be heated.
as the cylinder is transferring freely, the pressure is equal to the outside pressure, i.e., 1 atm, beneath all situations.
consequently, by using the use of Charles regulation, we get
V₁ / T₁ = V₂ / T₂
where V₁ and V₂ are preliminary and very last volumes
and T₁ and T₂ are preliminary and very last temperatures (in Kelvin).
accordingly, the very last temperature is
T₂ = V₂ × T₁ / V₁
Or, T₂ = 557 x (zero+273) / 371
Or, T₂ = 410 okay
Or, T₂ = 137°C
consequently the final temperature is 137°C.
The physical principle known as Charles' law states that the volume of a gas equals a constant value multiplied by its temperature as measured on the Kelvin scale (zero Kelvin corresponds to -273.15 degrees Celsius)
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What is the function of mitochondria?
Answer:
It regulates metabolic activity of a cell
It promotes the growth of new cell and cell multiplication.
It produce energy
Answer:
As mitochondria is known as powerhouse of cell,its functions are:
It produces energy required for the cell.
It stores the energy.
It promotes cell growth and cell multiplication.
What is the density of water at room temperature in g/ml? give just the number and not the unit.
The density of water at room temperature is 1.0 g/ml.
Density is defined as the mass per unit volume. It gives the denseness of a given substance in a specific space. Different substances have different densities.
The formula to calculate the density is:
ρ =m/v
where,
ρ is the density, m is the mass of the object and V is the volume of the object. The SI unit of density is kg/m³, but we use g/ml for our convenience.
For example, the density of water is 1000 kg/m3 but we convert it into 1.0 g/ml.
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_______________ forces mediated by _________________ are disrupted when ice melts
Answer:
Explanation:
intermolecular forces mediated by hydrogen bonding are disrupted when ice melts.
The melting point and the normal boiling point of water can be used to
calibrate thermometers. what are these respective temperatures in
kelvins?
1.) 32 and 212
2.) 0 and 373
3.) 0 and 100
4.) 100 and 273
5.) 273 and 373
The melting point and the normal boiling point of water in respective temperatures in kelvins are 273 and 373. The correct option is 5.
What is the boiling point?The boiling point is the point of water when the water vapor of the water is equal to the water vapor of the atmosphere.
The melting point is the point when a solid-state converts into liquid, and changes its physical state.
In Celsius, the boiling point is 100⁰C
In Kelvin, 273 + 100 = 373 K
The melting point is ice is 0⁰C
273 + 0 = 273 K
Thus, the correct option is 5. 273 and 373.
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Substance P is soluble in water but insoluble in propanone.
Substance Q is insoluble in water but soluble in propanone.
Substance R is insoluble in both water and propanone.
Describe how to obtain a pure dry sample of each of P, Q, and R from a mixture of P+Q+R.
The protons located on the unlabeled carbon atom belong to which proton set?
The protons located on the unlabeled carbon atom belong to a proton set.
An atom is a particle of matter that uniquely defines a chemical element. Atoms consist of a central nucleus surrounded by one or more negatively charged electrons. The nucleus is positively charged and contains one or more relatively heavy particles known as protons and neutrons.
Atoms are the building blocks of matter that cannot be broken down into smaller pieces by chemical processes. Most atoms are made up of three particles: protons, neutrons, and electrons. The defining particle that identifies an atom is the number of protons it contains. A particle without protons is not an atom.
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At a ph of 7.25 , the ratio of protonated glu molecules to deprotonated glutamate molecules is:_______
At a ph of 7.25 , the ratio of protonated glu molecules to deprotonated glutamate molecules is 1.100
Here at a pH of 7.25, the average Glu side chain is and protonated negatively charged so used henderson hasellbalch equation so ph=pka+log[A+]/[HA] the side chain carboxylic acid functional group of the glutamic acid molecule has a pKa of 4.1 and therefore exists almost entirely in its negatively charged deprotonated carboxylate form at pH values greater than 4.1; therefore, it is negatively charged at physiological pH ranging from 7.35 to 7.45
Glutamic side chain is 4.25
At a ph of 7.25 , the ratio of protonated glu molecules to deprotonated glutamate molecules is 1.100
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Microscale reactions involve reaction mixtures with volumes___. some benefits of microscale chemistry are:____.
Microscale reactions involve reaction mixtures with volumes of 5 ml or less than 5 ml.
The benefits of microscale chemistry are as :
reduction in time for the experiment.cost-efficient.fewer safety hazards .less waste generation.Microscale reactions, delay with extremely small amounts of reagents and solvents, which reflects in the name, the reactions mainly work with 300 mg of compounds and solvent with volumes of 5 ml or less than 5 ml.
The benefits of such kind of chemistry are such as the first there is the involvement of less time in conducting the procedure, it allows repetition if something fails, second beacuse of usage of less chemical, lesser use of glassware of it is cost efficient, next there is a reduction in safety hazards such as possible explosions, and it efficient as it leads to minimizing in the quantity of waste.
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You have to calculate the mass of a 30.0 ml liquid sample with density of 1.52 g/ml, but you have forgotten the formula. which way of reasoning would help you in finding the correct mass?
It is given that volume & density of liquid = 30.0ml = 1.52 g/ml
is read Density is as 1.529 g/ml
mass of Ime of liquid is 1.529.
option A is correct.
So, the mass of 30 ml liquid. = (1.52 x 30 g/ml ml =
1.529 X 30 g
45.69 g
the question is incomplete
A liquid is a nearly incompressible fluid that conforms to the shape of its container but maintains (nearly) constant volume regardless of pressure. As such, it is one of the four fundamental states of matter (the others being solids, gases, and plasmas) and is the only state with a definite volume, but no fixed shape. Liquids are made up of tiny vibrating particles of atom-like matter held together by intermolecular bonds. Like gases, liquids can flow and take the form of containers.
The volume of a liquid is fixed, but the shape is not. Examples of liquids are water, oil, and blood. A liquid is a state of matter that has a fixed volume but no fixed shape. That is, the liquid takes the shape of its container. The matter is something that takes up space and has weight. Solids keep their shape, liquids take the shape of their containers, and gases fill their containers.
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You have to calculate the mass of a 30.0 mL liquid sample with density of 1.52 g/mL, but you have forgotten the formula. Which way of reasoning would help you in finding the correct mass?
Select one:
a. If 1 mL of a liquid has the mass of 1.52 g, then 30.0 mL has the mass of _____ g.
b. If 1.52 mL of a liquid has the mass of 1 g, then 30.0 mL has the mass of _____ g.
Pepsin can begin the digestion of protein in the stomach after it is converted from pepsinogen by?
Pepsin can begin the digestion of protein in the stomach after it is converted from pepsinogen by Hydrochloric acid (HCl)
Hydrochloric acid (HCl) converts the pepsinogen to pepsin. It breaks down the proteins into the peptides.
Pepsinogen ------HCl-----> Pepsin
HCl maintains a pH of 2.0 in the stomach.
Pepsin is a digestive enzyme which breaks down the protein in the stomach.
When pepsinogen and hydrochloric acid are present in the gastric juice together, pepsin takes its active form, because HCl is a very strong acid. It denatures the protein. It degrades the extra polypeptide of pepsinogen. This extra polypeptide covers the active site.
Chief cells of gastric regions secretes the enzyme pepsin in an inactive form called pepsinogen. A low pH of 1.5 to 2 activates pepsin.
Pepsin has many uses as it is used in the treatment of indigestion and pancreatitis. It helps in the digestion of food.
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Write the symbol for every chemical element that has atomic number greater than 70 and atomic mass less than 181.2 u.
Answer:
Lu
Hf
Ta
Explanation:
Lu- Lutecium
Atomic Number- 71
Atomic Mass-174.967
Hf- Hafnium
Atomic Number-72
Atomic Mass178.492
Ta- Tantalum
Atomic Number-73
Atomic Mass-180.948
The chemical elements that meet the criteria are Hafnium (Hf) and Tantalum (Ta).
The atomic number represents the number of protons in the nucleus of an atom, while the atomic mass represents the total mass of protons and neutrons in the nucleus of an atom.
Elements with atomic numbers greater than 70 are located in the bottom rows of the periodic table, known as the "lanthanides" and "actinides."
So, Atomic Number > 70 and Atomic Mass < 181.2 u
1. Hafnium (Hf) - Atomic Number: 72, Atomic Mass: 178.49 u
2. Tantalum (Ta) - Atomic Number: 73, Atomic Mass: 180.95 u
3. Tungsten (W) - Atomic Number: 74, Atomic Mass: 183.84 u
4. Rhenium (Re) - Atomic Number: 75, Atomic Mass: 186.21 u
Therefore, the chemical elements are Hafnium (Hf) and Tantalum (Ta).
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The specific heat capacity of an object depends only on the substance from which the object is made. true false
True, the specific heat capacity of an object depends only on the substance from which the object is made.
Specific heat capacity is defined as the amount of heat required to raise the temperature of one gram of a substance by one degree Celsius.
The SI unit of specific heat capacity is joule per kelvin per kilogram.
The specific heat capacity at constant volume is written as,
[tex]C_{V} = (du/dt)_{V}[/tex]
The specific heat capacity at constant pressure is written as,
[tex]C_{P} = (dh/dT)_{P}[/tex]
here, u is the internal energy of system in kJ/kmol and h is the enthalpy of system in kJ/kmol.
For an Ideal gas the relation between heat capacity at constant volume and at constant pressure can be written as ,
[tex]C_{P} - C_{V} = R[/tex]
Specific heat capacity is an intensive property i.e., independent of quantity. No matter how much substance we have, its ability to absorb heat energy at a particular temperature is the same.
So, we can say that the specific heat capacity of an object depends only on the substance from which the object is made and not on its quantity.
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A 54-year-old client has a cholesterol level of 240 mg/dl (6.2064 mmol/l). what serum concentration of cholesterol would this client have?
A 54-year-old client has a cholesterol level of 240 mg/dl (6.2064 mmol/l). this client would have a high serum concentration of cholesterol.
Individuals or groups seeking professional advice or services, such as lawyers, accountants, advertising agencies, and architects. Those who receive benefits or services from social welfare corporations, government agencies, etc. Someone who is under the patronage of someone other than the customer.
An example client is a student teaching at a university writing center. A terminal or computer is connected to the server. A person receiving help or advice from a professional (lawyer, accountant, social worker, psychiatrist, etc.). A client, used in home and business networks, is any computer hardware or software device that requests access to services provided by a server. A client is usually considered a requesting program or user in a client/server architecture.
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Sparrows with average-sized wings survive severe storms better than those with longer or shorter wings, illustrating?
Sparrows with average-sized wings survive severe storms better than those with longer or shorter wings illustrates Stabilizing selection.
Stabilizing selection is a natural selection in which stabilized traits are selected rather than any extreme traits by the nature. Nature do not favors any drastic change in the traits over the years.
Stabilizing selection is often confused with or misunderstood as negative or purifying selection.
Stabilizing selection favors intermediate variants promoting survival of the species.
Average phenotype is selected and continuously dominates in coming generations.
This natural selection helps species to adapt stable phenotype for better survival rate.
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(a) Barium ions are poisonous. Patients with digestive tract problems are sometimes given
an X-ray after they have swallowed a ‘barium meal’, consisting of a suspension of
BaSO4 in water. The [Ba2+(aq)] in a saturated solution of BaSO4 is too low to cause
problems of toxicity.
(i) Write an expression for the solubility product, Ksp, for BaSO4, including its units.
...................................................................................................................................
(ii) The numerical value of Ksp is 1.30 × 10–10. Calculate [Ba2+(aq)] in a saturated
solution of BaSO4.
...................................................................................................................................
...................................................................................................................................
(iii) The numerical value of Ksp for BaCO3 (5 × 10–10) is not significantly higher than
that for BaSO4, but barium carbonate is very poisonous if ingested. Suggest a
reason why this might be so.
...................................................................................................................................
............................................................................
QUESTION NUMBER (b)(iii) and (ii) PLEASE....
The numerical value of the Ksp of [tex]BaSO_{4}[/tex] is 1.69 * 10^-20.
What is the Ksp?The Ksp is an equilibrium constant that shows the extent to which a substance is soluble in water. Now consider the fact that [tex]BaSO_{4}[/tex] is almost insoluble in water.
i) The Ksp of the [tex]BaSO_{4}[/tex] solution can be obtained from the relation;
Ksp = [[tex]Ba^{2+}[/tex]] [[tex]SO_{4}^{2-}[/tex]]
ii) The numerical value of the Ksp is obtained from; [1.30 × 10–10]^2 = 1.69 * 10^-20
iii) The reason for the toxicity of [tex]BaCO_{3}[/tex] even though it is not more soluble that barium sulfate is that [tex]BaCO_{3}[/tex] can dissolve in the gastrointestinal tract which is acidic leading to barium poisoning.
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Polypeptides are synthesized from amino acid building blocks. the condensation reaction between the growing polypeptide chain and the next amino acid to be added involves the loss of:_______
Answer:
a water molecule.
Explanation:
The two reacting groups are a carboxylixc acid group (-COOH) and an amine (-CNH2). The forms the peptide link (-C-CO-N-C) and a molecule of water is released (H2O).
