A reaction in which bonds are created is usually associated with the Release of energy.
What are the various types of bonds?
There are three sorts of bonds:
1. Electrovalent or electrovalent bond
2. chemical bond
3. dative bond
Electrovalent or electrovalent bond are formed when one or more electrons are transferred from one atom to another.
Covalent bonds are formed when the atoms during a molecule share an equal number of electrons.
A dative bond is one in which both electrons in a shared pair come from the same atom.
Now, atoms tend to stabilize once they form chemical bonds, releasing energy within the process. Energy is released because there's a higher level of stability associated with a low energy level.
Hence, a reaction in which bonds are created is usually associated with the release of energy.
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Change 1
Change 1 is:
impossible
a physical change
a chemical change
Sample of Substance X
Change 2
Change 2 is:
impossible
a physical change
a chemical change
Change 3
Change 3 is:
impossible
a physical change.
a chemical change
X
S
In the original sample of substance X, there are 12 molecules and each molecule is made of 2 small red spheres and one blue sphere in the middle.
Change 1:Change 1 has the same total number of red and blue spheres as the original sample, but the structure of molecules has changed. As a result, this is a chemical change.
Change 2:In Change 2, the structure of molecules is changed. Some molecules contain solely red spheres, whereas others include both red and blue spheres. Furthermore, the total number of molecules is greater than the number of molecules in the original sample. This violates the principle of conservation of mass. Hence, this is an impossible change since extra matter was created in this change.
Change 3:In Change 3, the number of the molecules and the structure of the molecules is same as the orignial sample. Hence, it is a physical change.
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HELP, as much as i try to understand i cant
The table is based on the periodic table and is to be filled by finding out various elements of periodic table
Disclaimer:
The table given below is not clear and hence only general idea can be provided
The table is based on the idea of periodic table where various constituents such as mass number, overall charge , total particles, number of protons have been asked to be labelled.
Sodium has been solved as an example and various postulates of Cu is being provided to solve accordingly
In the constituents of element Cu
Name- Cuprous and Cupric
Atomic number-29
Mass number-63
overall charge-+2 for Cuprous and +3 for Cupric
Total particles in nucleus-63
number of protons -29
number of neutrons-34
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Convert the following to scientific notation.
1, 0,005 =
2. 5,050,=
3. 0,0008 =
4. 1,000 =
5. 1,000,000, =
6. 0.25 =
7. 0.025 =
8. 0.0025 =
9. 500 =
10. 5,000 =
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As the wavelength of an electromagnetic wave gets longer, the frequency ____________________.
Why do you think the mass was lost when the reaction was done in the normal setup but stayed the same when the reaction was done in the gas collection setup?
The mass was lost when the reaction was done in the normal setup but stayed the same when the reaction was done in the gas collection setup because of the law of conservation of mass.
The law of conservation of mass states that -
Mass can neither be created nor destroyed or lost, in any reaction. It remains constant in a system.
So, the mass lost in surrounding was neither got considered nor got calculated when the reaction setup was done in normal way. But when the reaction was done in a closed setup where after the reaction, the gas was collected, the mass was changed. It proved the postulate stated by the law of conservation of mass and energy.
Therefore, it is explained by the law of conservation of mass.
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Which reactant will be the best reactant for a nucleophilic aromatic substitution?
The reactant that will be the best reactant for a nucleophilic aromatic substitution is NO₂- NO₂. The correct option is b.
What is nucleophilic aromatic substitution?Nucleophilic aromatic substitution is a substitution process of nucleophile substance is substituted by halides in an aromatic ring. Aromatic compounds contain this type of substitution.
In option b, the compound is the one nitroxide group substituted by halogen, that is fluorine. The fluorine group is substituted in these given aromatic compounds.
Thus, the correct option is b, NO₂- NO₂.
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The question is incomplete. Your most probably complete question is given below:
NO₂F
NO₂- NO₂-F
CH₃-O
CH₃-O-F
In a construction site, a crane lifts 1000kg of concrete mix to the roof top at a height of 20 metres in 50 seconds. find the power of elevator.
On a construction site, a crane lifts 1000kg of concrete mix to the rooftop at a height of 20 meters in 50 seconds, then the power of the elevator would be 3.924 kilowatts.
What is work done?The total amount of energy transferred when a force is applied to move an object through some distance.
The work done is the multiplication of applied force with displacement.
The work done by the elevator = mgh
=1000*9.81*20
=196200 Joules
The power used by the elevator = work done / time
=196200 /50
=3924 watts
Thus, the power used by the elevator would be 3.924 kilowatts.
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The power of elevator is 4,000 w
What is power?
The time rate of doing work or delivering energy, expressible as the amount of work done W, or energy transferred, divided by the time interval t—or W/t is called power.
Given:
Here, the mass of a concrete lift that can carry by a crane to rooftop =1000 kg,
height =20 m,
time taken by crane to lift concrete mix =50 s
assume, acceleration due to gravity i.e. g =10 m/s²
The formula of power is given by:
power = [tex]\frac{mass*acceleration due to gravity*height}{time taken}[/tex]
power of elevator =[tex]\frac{mgh}{t}[/tex]
= [tex]\frac{1000*20*10}{50}[/tex] = 4000 w
Thus, the power of elevator is 4000 w
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True or false? the iron recommendation for girls exceeds that of boys during adolescence.
It is true that the iron recommendation for girls exceeds that of boys during adolescence.
During an adolescence, girls and boys require iron for a large growth spurt and the gain of adult phenotypes and biologic rhythms.
In this period of the life, iron recommendation increase in both girls and boys, because of the increase in lean body mass, the expansion of the total blood volume, the increase and start of menstruation at girls.
Iron is essential for oxygen transport, red blood cell creation, cognitive performance and immunological function.
The overall iron requirements for girls are up to twice as boys.
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Q1. A student investigated the law of conservation of mass
The law of conservation of mass states that the mass of the products is equal to the
mass of the reactants.
This is the method used.
1. Pour lead nitrate solution into a beaker labelled A.
2. Pour potassium chromate solution into a beaker labelled B.
3. Measure the mass of both beakers and contents.
4. Pour the solution from beaker B into beaker A
5. Measure the mass of both beakers and contents again.
When lead nitrate solution and potassium chromate solution are mixed, a reaction takes
place.
This is the equation for the reaction:
Pb(NO₂)(aq) + K.CrO.(aq)
(a). -> PbCrO.(s) + 2KNO.(aq)
Beaker A and contents before mixing: 128.71g
Beaker B and contents before mixing: 128.97g
Beaker A and contents after mixing: 154.10g
Beaker B after mixing: 103.58g
Show that the law of conservation of mass is true.
Use the data from the table above.
The following question follows the law of conservation of mass.
The law of conservation of mass states that in a reaction the mass of the products is equal to the mass of the reactants.
The reaction is :
Pb(NO₃)₂(aq) + K₂CrO₄(aq) → PbCrO₄(s) + 2KNO₃(aq)
the mass of beaker A containing lead nitrate = 128.71g
the mass of beaker B containing potassium chromate = 128.97g
After mixing beaker A and B,
mass of beaker A = 154.10g
mass of beaker B = 103.58g
Thus, according to law of conservation of mass,
mass of reactants = 128.71 + 128.97 = 257.68g
mass of products = 154.10 + 103.58 = 257.68g
hence, mass of products = mass of reactants.
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An aluminum-containing compound has the formula mgxalyo4 and is 44. 98% oxygen by mass. What is the value of the subscripts x and y?.
The value of the subscripts x is 1 and y is 2.
ω(O) = 44.98% ÷ 100%
ω(O) = 0.4498; mass percentage of oxygen in the compound
M(compound) = 4 × 16 g/mol / 0.4498
M(compound) = 142.3 g/mol; molar mass of the compound
Oxidation number of oxygen atom in the compound is -2, for oxygen atoms total charge is -8.
Magnesium and aluminium must have total charge of +8 in the compound.
Magnesium has oxidation number +2.
Aluminium has oxidation number +3.
x is amount of magnesium atoms.
y is amount of aluminium atoms.
x × (+2) + y × (+3) = +8
x must be 1 and y must be 2.
M(compound) = M(Mg) + 2M(Al) + 4M(O)
M(compound) = 24.3 g/mol + 2×27 g/mol + 4×16 g/mol
M(compound) = 142.3 g/mol.
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What group is obtained by adding or deleting from each of the following groups the indicated symmetry operation?
a) c3 plus i
b) c3v plus i
c) c3h minus s35
d) c3 plus s6
In the group that is obtained by adding or deleting from each of the following groups, the indicated symmetry operation is c3 plus i. The correct option is a.
What are symmetries?In organic chemistry, the shape of the compounds that are formed is made or discovered. The shape of water molecules, benzene, etc. These structures of symmetries are sent by the connecting or joining of elements with bonds.
Citroën C3 is an organic compound that gives symmetry operation when a group or added or deleted from the compound.
Thus, the correct option is a. c3 plus i.
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Acteria and archaea fix nitrogen (n2) by reducing it to ammonia (nh3), the form of nitrogen assimilated by plants. the main reservoir of nitrogen is:______
Bacteria and archaea fix nitrogen (n2) by reducing it to ammonia (nh3), the form of nitrogen assimilated by plants. the main reservoir of nitrogen is is the atmosphere.
The transformation of atmospheric Nitrogen N[tex]_{2}[/tex] into ammonia NH[tex]_{3}[/tex] which is a form that plants may use, is known as biological nitrogen fixation. However, eukaryotes do not engage in the process; it is exclusive to bacteria and archaea.
It has long been recognized that some archaea can contribute to the nitrogen cycling processes (albeit some of these organisms were not initially recognized as archaea). These included both assimilatory and dissimilatory activities, such as the fixing of atmospheric nitrogen. However, rather than large terrestrial or aquatic environments, these reactions were linked to extremophilic archaea that are generally found in 'exotic' habitats like hot springs or salt-saturated lakes.
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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.
A prescription calls for the administration of 100 g of mannitol as solution. calculate how many milliosmole of mannitol (molecular weight = 182, nonelectrolytes) is in the dosage
The 100g solution of mannitol has 549.45 millimoles.
Mannitol (C₆H₈(OH)₆) is used in pharmaceutical goods as a sweetener, tablet and capsule diluent, excipient for chewable tablets, tonicity agent, and vehicle (bulking agent) for lyophilized preparations. It is used as a drug to lower elevated intracranial pressure and lower ocular pressure, as in glaucoma.
The molecular weight of mannitol = 182g.
Mass of mannitol given = 100g.
∴ Moles per liter of mannitol = [tex]\frac{Mass of mannitol}{Molecular weight of mannitol}[/tex]
[tex]=\frac{100}{182}[/tex]
= 0.54945 moles
Now,
1 mole = 1000 millimoles
∴ 0.54945 moles of mannitol = [tex]\frac{0.54945 }{1000}[/tex]
= 549.45 millimoles
Hence, the 100g solution of mannitol has 549.45 millimoles.
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A 33.9g sample of lead is placed in a graduated cylinder containing 20.0mL of water.
The lead sinks to the bottom. If the density of lead is 11.4g/cm³, what will the final
volume read on the graduated cylinder?
The correct answer for the final volume read on the graduated cylinder = 4.72 ml ^3 .
density of lead is 11.4g/cm³,
quantity of water = 20.0 mL = 20 gram
sample of lead = 33.9 g
density = mass / volume
total mass = 20+ 33.9 = 53.9
volume = mass/ density
volume = 53.9/ 11.4
volume = 4.72 ml ^3
Graduated cylinders are long, slender vessels used to measure liquid volumes. They are not meant to be mixed, stirred, heated, or weighed. Graduated cylinders typically range in size from 5 mL to 500 mL. It is a tall narrow container with a volume scale used specifically for measuring liquids. These 100 mL glass graduated cylinders are used to accurately and easily measure and dilute liquids! These class-A, lab-quality graduates are built to deliver precise measurements while resisting breakage and a wide range of chemicals. A plastic volume marker is included.
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Round each measurement to three significant figures. Write your answers in scientific notation.
a. 8758.073 meters
b. 435,200,000
c. 0.001552 meter
d. 0.009009 meters
e. 177,888 meters
f. 629.55 meters
Answer: a. 8.76*10^3 meters
b. 4.35*10^8 meters
c. 1.55*10^(-3) meters
d. 9.01*10^(-3) meters
e. 1.78*10^5 meters
f. 6.30*10^2 meters
Explanation:
a. 8758.073 meters=
8000+758.073=
8*1000+758.073/1000 *1000=
8*10^3+0.758073*10^3=
(8+0.758073)*10^3=
8.758073*10^3=
8.758073*10^3=8.76*10^3 meters
b. 435,200,000=
400,000,000+35,200,000=
4*100,000,000+35,200,000/100,000,000 *100,000,000=
4*10^8+0.352*10^8=
4.352*10^8=
4.352*10^8=4.35*10^8 meters
c. 0.001552 meter=
1.552/1000 =
1.552 * 1/1000=1.55*10^(-3) meters
d. 0.009009 meters=
9.009/1000=
9.009*10^(-3)=9.01*10^(-3) meters
e. 177,888 meters=
100,000+77,888=
1*100,000+77,888/100,000 *100,000=
1*10^5+0.77888*10^5=
1.77888*10^5=1.78*10^5 meters
f. 629.55 meters=
6000+29.55=
6*100+29.55/100 *100=
6*10^2+0.2955*10^2=
6.2955*10^2=6.30*10^2 meters
One serving of peanuts has about 166.000 calories. Convert this to Joules.
[answer: 695,000 J]
please show me the work! thank youu!
One serving of peanuts has about 166.000 calorie then in joules are 695,000 Joule means 694.544 Joule and 'joule is the amount of energy exerted when a force of one newton is applied over a displacement of one meter'
A calorie is a unit of energy in nutrition, calories refer to the energy people get from the food and drink they consume, and the energy they use in physical activity and calories are listed in the nutritional information on all food packaging many weight loss programs center around reducing the intake of calories.
Here given data is peanuts = 166.000 calories given in the calories then we have to find in joules = ?
In the thermochemical calories to joule we have one given value i.e
1cal th = 4.184 J means here 1 cal = 4.184 J
So, we have to calculate 166.000 calories
Then, 4.184×166.000
= 694.544 J
Which is approximately 695,000 J
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Hydrophilic molecules that are to be released by cells are stored in membrane-bound structures called:_____
Hydrophilic molecules that are to be released by cells are stored in membrane-bound structures called Secretory vesicles.
The secretory vesicle is a vesicle that mediates the vesicular delivery of cargo - e.g. hormones or neurotransmitters - from an organelle to particular web websites on the molecular membrane, in which it docks and fuses to launch its content.
Secretory vesicles shape from the trans-Golgi network, and they launch their contents to the molecular outside with the aid of using exocytosis in reaction to extracellular signals. The secreted product may be both a small molecule (together with histamine) or a protein (together with a hormone or digestive enzyme).
Vesicles are small systems inside a molecule, together with fluid enclosed with the aid of using a lipid bilayer worried in delivery, buoyancy control, and enzyme storage.
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Which statement about Niels Bohr's atomic model is true?
Correct answer is Each orbit has a specific energy level.
According to Bohr's atomic model There is a certain energy for each orbit, with the inner orbit having the lowest energy. As you move farther from the nucleus, the energy of the orbits increases. We can say that the energy of the electrons are quantized if we state that they can only have certain energies.The ground state, also known as the lowest orbit, is where the electron typically resides.A lower energy level to a higher energy level is reached by an atom's electrons by gaining the necessary energy, and a higher energy level to a lower energy level by losing energy.Inner energy levels have low energy and outer or higher energy levels have high energy.Therefore, Correct statement is Each orbit has a specific energy level.
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The complete question is mentioned below:
Which statement about Niels Bohr’s atomic model is true?
a) Higher orbits have lower energies.
b) Each orbit has a specific energy level. c) Electrons can exist in any energy level. d) Orbits close to the nucleus have no energy.
The reduction of a molecule can sometimes result in the acquisition of a proton, a reaction referred to as:______.
The reduction of a molecule can sometimes result in the acquisition of a proton, a reaction referred to as hydrogenation.
What is hydrogenation?
Molecular hydrogen (H2) and another substance or element undergo a chemical reaction known as hydrogenation, typically in the presence of a catalyst such as nickel, palladium, or platinum. The method is frequently used to saturate or decrease organic molecules.
To turn an oil that is liquid into a solid fat. Hydrogenation, sometimes in conjunction with other procedures like interesterification or fractionation, may offer a technique to manufacture the needed fat when solid fats of the proper consistency are expensive or unavailable.
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Crack is made by taking powdered cocaine hydrochloride and adding sodium bicarbonate and water. True or false
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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points
Sodium and chlorine react together to form sodium chloride. Identify the reactant(s) and product(s?
Sodium and chlorine are the two reactants and sodium chloride is the product.
A very reactive metal called sodium interacts with chlorine gas to form sodium chloride, an inert salt. Chlorine gas is reduced to chloride anions whereas sodium is oxidized to sodium cation (Na+) (Cl-).One mole of sodium and two moles of chlorine gas combine to form two moles of sodium chloride.We are aware that chlorine is a very reactive non-metal and that sodium is a very active metal. Typically, non-metals like halogens tend to receive electrons while metals prefer to expel electrons.Chlorine accepts the electron to create the anion Cl-, and sodium rapidly loses its final shell electron to produce the cation Na+.Sodium, a solid reactant, interacts with greenish-yellow gaseous chlorine to form white crystalline sodium chloride.
Therefore, sodium and chlorine are reactants whereas sodium chloride is the product.
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Which pair of elements do you expect to be most similar?
a. mo and sn cl and f si and p k and sr n and ni
Among the pair of elements given, Cl and F are expected to be the most similar.
On the basis of periodic table,
Cl and F are in the same group which is the halogen group. Thus, they possess similar properties.Of the choices provided, Chlorine (Cl) and Fluorine (F) are the only pair located in the same group while the others belong to different groups in periodic table.
Nitrogen have symbol N and belongs to main group element while Nickel have symbol Ni and belong to transition element. Therefore, they are not similar.
Molybdenum have symbol Mo belongs to transition element and Tin have symbol Sn belongs to main group element possessing different properties.
Sodium have symbol Na and classified as alkali metal while Magnesium have symbol Mg, classified as alkaline earth metals. They do no have similar properties.
Silicon having symbol Si is a metalloid while Phosphorus having symbol P is a non-metal. Thus, they are not similar.
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What compound interest per period in percentage would result in the future amount being 1.6 times as large as the starting amount at the end of 10 periods?
The nominal interest rate is therefore 4.8122%.
This compound interest problem can be solved by using the formula
A = P(1+i^)n,
where i = r/n and
A represents the total amount of money accumulated during the nth conversion period.
The nominal interest rate is r.
P is the initial investment's primary amount.
t is the number of years,
n is the number of compounding periods per year.
Assuming P = $100 in this case,
the eventual amount A will be 1.6 * 100 = 160, t = 10 years, and n = 1.
The result of the formula above is Nominal interest rate (in decimal) is equal to n [(A/P)^1/nt - 1].
When we substitute,
we obtain the value r = 1*[(160/100)^1/10 -1].
r = (1.04812 -1)
r =0.048122 (in decimal)
r = 0.048122 *100
r= 4.8122%
The nominal interest rate is therefore 4.8122%.
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The molecular formula for glucose is c6h12o6. What would be the molecular formula for a molecule made by linking three glucose molecules together by dehydration reactions?.
C₁₈H₃₂O₁₆ is the molecular formula called a-maltotriose for a molecule made by linking three glucose molecules together by dehydration reactions.
It is a dehydration reaction, it means that when two molecules are linked together, there will be one molecule of water H₂O removed
A-maltotriose molecule is a trisaccharide molecules which means linkage of three glucose molecules linked with 1,4 glycosidic bond this is called as a-maltotriose which is formed in the reaction as product
The reaction will be:
C₆H₁₁O₅-OH+H-C₆H₁₀O₅-OH+H-C₆H₁₁O₆→C₁₈H₃₂O₁₆+2H₂O
Here one molecule of water H₂O removed.
Therefore molecular formula of the molecule formed will be C₁₈H₃₂O₁₆.
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A chemist adds a chemical to pure water and there is a 100-fold increase in the concentration of hydrogen ions. What is the best approximation of the new ph value?.
A chemist adds a chemical to pure water and there is a 100-fold increase in the concentration of hydrogen ions. the new ph value is 5.
What factors influence a solution's pH?The pH of a solution is determined by the concentration of hydrogen ions in that solution. The pH value is the logarithmic value of the inverse of hydrogen ion activity. Because the concentration of hydrogen ions is frequently very low, ion activity is considered to be equal to the concentration of hydrogen ions.
What's the connection between ion activity and pH?The logarithmic value of the inverse of hydrogen ion activity is the pH value. Because the concentration of hydrogen ions is frequently very low, ion activity is assumed to be equal to the concentration of hydrogen ions. The pH is then the logarithm of the inverse of the concentration of hydrogen ions.
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During the synthesis of which type of molecule is a carboxyl group lost from a fatty acid, and water produced as an end product?
During the synthesis of lipids, a carboxyl group is lost from a fatty acid, and water is produced as an end product. The correct option is A.
What are lipids?Lipids are fatty acids that have two types of ends, a hydrophilic end, and a hydrophobic end. Lipids format the cell membrane structure and functions. They are greasy substances.
When there is a synthesis of lipids, water is produced as the end product and the carboxyl group will lose to form a molecule of fatty acid.
Thus, the correct option is A) lipids, regarding the molecule in which water is lost.
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The question is incomplete. Your most probably complete question is given below:
A) lipids
B) proteins
C) nucleic acids
D) carbohydrates
3.7+5.894+782.52=
in sig fig rules
In scientific notation, "significant figures" refers to the significant single digits (0 to 9, inclusive) of the coefficient of expression.
What do you mean by significant numbers using an example?A significant figure in a given number is made up of all the certain digits plus one uncertain digit. They are reliant on the scale's or measurement tool's accuracy.
What is the example of significant figure?1. 587 is an example of four important digits (three are certain and one is doubtful).
What is the calculation of the above problem?On solving above problem we get,
3.7 + 5.894 + 782.52
9.594 + 782.52
792.114
792.1
The answer of the above problem is 792.1.
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A 0.372-g sample of naoh(s) is added enough water to make 250.0 ml of solution. the ph of this solution is:______
A 0.372-g sample of sodium hydroxide(s) is added enough water to make 250.0 ml of solution. the ph of this solution is 12.571
gram of sodium hydroxide X 1 mol of NaoH in volume/total vol of NaoH= 0.093ml/250ml=0.372= 12.571
Other names for sodium hydroxide include lye, soda, and caustic soda. Sodium hydroxide is a white, crystalline, odorless solid at room temperature that draws moisture from the atmosphere. It is a product of synthetic manufacturing. It produces significant amounts of heat when dissolved in water or neutralized with acid, which could be enough to ignite combustible objects. It is very corrosive to use sodium hydroxide. In most cases, sodium hydroxide is utilized as a solid or diluted to a 50% solution. The production of soaps, rayon, paper, explosives, dyestuffs, and petroleum products all employ this chemical.
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