If 5 mol NO2 react with 1 mol H2O, how many moles of the excess reactant remains when the reaction is complete?
3 NO2 + H2O ⟶ NO + 2HNO3

Answer:

no, amu of carbon is 12 . if it changes the element will change

In the polysaccharide cellulose, large numbers of monosaccharides are linked together through glycosidic linkages.

TPolysaccharides, which are the most ubiquitous carbohydrates in nature, serve a number of functions, including energy storage and incorporation into plant cell walls.

Tens to thousands of monosaccharides are joined together via glycosidic linkages to form large polymers known as polysaccharides. The three most frequent polysaccharides are starch, glycogen, and cellulose. They are collectively referred to as homopolymers because, after complete hydrolysis, each of these three exclusively yields one type of monosaccharide (glucose).

Heteropolymers may also comprise sugar acids, amino sugars, or non-carbohydrate substances in addition to monosaccharides. Polysaccharides, a class of non-reducing carbohydrates, are not sweet and do not change. 

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The element whose isotope is represented as  \(_{6}^{14}X\) is carbon -14. The atomic number of carbon is 6 and the mass number for the given isotope is 14 amu.

Isotopes are atoms of same element with different  mass numbers. Isotopes slightly changes in chemical and physical properties between each other.

Almost elements in the periodic table are having isotopes. However not all of them are stable. Some of them for heavy metals are radioactive isotopes and are not stable.

The isotope is represented by showing mass number in top of the symbol and atomic number at the bottom. The atomic number 6 corresponds to carbon. Hence, option A is correct. Carbon -14 isotope is given here.

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The addition of 2 mL of 6.0 M HCl caused the equilibrium to shift in the reverse direction.

This is because the HCl added to the solution decreases the amount of SbClz in solution. This dilutes the solution by increasing the total volume, and increases the moles of H' and CH in solution.

To reach equilibrium, the system must increase the amount of reactants, so an equilibrium shift in the reverse direction is observed. The reaction of the SbClz in solution with the added H' and Cl' in solution also contributes to the shift in equilibrium, as more products are formed. The net effect of the addition of HCl is an equilibrium shift in the reverse direction.

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The valence electrons are;

aluminum  - 3

magnesium  - 2

fluorine  - 7

arsenic  - 5

We have to note that when we talk about the valence electrons we mean the electrons that we can be able to find at the outermost shell of the atom. In the case of the atoms that we have here. We would have to look at  the shell where the electrons can be found.

In this case, we can see that have the following elements that we need to determine the valence electrons; aluminum magnesium fluorine arsenic. This can be done when we look at the groups that they belong to in the periodic table.

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Answer: C. Na2B4O7•10H2O

Explanation:

Hope this helps :)

The formula is tetrasodium borate-Na2B4O7.10H2O

Given- 0.0132 mol Na2B4O7 and 0.1311 mol H2O

Using the molar mass of the anhydrous Na2B4O7 and its mass percentage, we can calculate the molar mass of the hydrate (if we look at it as 100% of the mass) by stoichiometry.

Molar mass of Na = (22.990 g/mol)

Molar mass of B = (10.811 g/mol)

Molar mass of O = (15.999 g/mol)

Molar mass of Na2B4O7= 2⋅22.990 g/mol +4⋅10.811 g/mol +7⋅15.999 g/mol = 201.217 g/mol

201.217g/mol : 52.8%=x g/mol : 100%

​x g/mol = 201.217 g/mol⋅100%÷52.8 %

x g/mol= 381.093 g/mol

In 381.093 g of hydrate, we have 201.217 g of anhydrous Na2B4O7 , the rest of the mass is water.

381.093g−201.217g= 179.876 g of water

Molar mass of H = 1.008 g/mol

Molar mass of O = 15.999 g/mol

Molar mass of  H2O= 1.008 g/mol+ 15.999g/mol  = 18.015 g/mol

179.876g ÷18.015 = 9.98= 10 moles of water per mole of hydrate.

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Answer:

20

Explanation:

Hi there!

We need to find the atomic number of an atom that has 20 protons and 20 neutrons

the atomic number of an atom is equivalent to the amount of protons an atom has, as the number of protons determines what element an atom is.

Since the atom has 20 protons, the atomic number of the said atom is 20

Hope this helps!  

The event which most likely occurs at point V during a rock cycle is cooling.

Point V is present in the rock cycle, where changes in the state or nature of rock takes place.

When mangma comes towards the surface of the earth then due to change in temperature and pressure it will concerts into the igneous rock by cooling process and coverts into the harder form.

Hence at point V, colling is occur.

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Answer:

A. cooling

Explanation:

edge 22'

Ethanol, a type of grain alcohol that may be combined with gasoline and used in vehicles, is beneficial to the environment because it is a renewable fuel that is produced from biomass.

Additionally, ethanol burns cleaner and more thoroughly than either gasoline or diesel. Carbon dioxide is removed from the atmosphere as the grain or biomass used to produce ethanol takes it in as part of its growth process, making ethanol a cleaner alternative to gasoline.

By using grain-based ethanol instead of gasoline, greenhouse gas emissions can be reduced by 44-52%, as reported by the Argonne National Laboratory of the United States Department of Energy. Similarly, a team of experts from Harvard, MIT, and Tufts found that modern corn ethanol reduces greenhouse gas emissions by 46% compared to gasoline.

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Answer:

C) 979 dg

Explanation:

1 Decagram = 0.01 Kilogram, and 1 kilogram = 100 Decagram.

Hope this helps :)

Answer:

fsf

Explanation:

sdfsd

During chemistry class, carl performed several lab tests on two white solids. The results of three tests are seen in the data table. Based on this data, carl has concluded that substance b must have ionic bonds.

The complete transfer of certain electrons from one atom to another results in the formation of an ionic connection. A negatively charged ion known as a cation results from an atom losing one or more electrons. An anion, or negatively charged ion, is created when an atom gains one or more electrons.

If the electronegativity of the two atoms differs by enough to allow one to totally draw an electron away from the other, the connection is ionic. Compounds that mix elements from the left-hand side of the periodic table frequently encounter such circumstance (sodium, potassium, calcium, etc.)

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Taking into account the Charles' law, the temperature of the gas if the volume drops to 75.0 L is 246 K or -27 C.

Charles' law establishes the relationship between the temperature and the volume of a gas when the pressure is constant. This law says that for a given sum of gas at constant pressure, as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases. That is, the volume is directly proportional to the temperature of the gas.

Mathematically, Charles' law is a law that says that when the amount of gas and pressure remain constant, the ratio between volume and temperature will always have the same value:

\(\frac{V}{T}=k\)

Considering an initial state 1 and a final state 2, it is fulfilled:

\(\frac{V1}{T1}=\frac{V2}{T2}\)

In this case, you know:

Replacing in Charles's law:

\(\frac{100 L}{328 K}=\frac{75 L}{T2}\)

Solving:

\(T2x\frac{100 L}{328 K}=75 L\)

\(T2=\frac{75 L}{\frac{100 L}{328 K}}\)

T2= 246 K= -27 C

Finally, the temperature of the gas if the volume drops to 75.0 L is 246 K or -27 C.

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25 gigaseconds is equal to 2,500,000,000,000 centiseconds

Answer:

The value \(N_A = 0.192 \ mol \cdot m^{-2} \cdot \ s\)

Explanation:

From the question we are told that

     The thickness of the air is \(z_2 - z_1 = 1 \ cm =0.01 \ m\)

      The temperature is  \(T = 25^oc = 25 +273 = 298 \ K\)

     The total pressure is  \(P_T = 1 atm = 1.01325*10^{5} \ Pa\)

      The partial pressure of Ammonia first side is  \(P_{AO} = 0.9 \ atm = 0.9 * 1.01325*10^{5} = 91192.5 \ Pa\)

      The partial pressure of Ammonia to the second side is \(P_{A} = 0.1 \ atm = 0.1 * 1.0325*10^{5} = 10132.5 \ Pa\)

 Rate of flow of ammonia is  

          \(D_{AB} = 0.214 \ cm/s = \frac{0.214 }{10000} = 2.14 *10^{-5} \ m^2 /s\)

Generally the  molar flux of ammonia is mathematically represented as

         \(N_A = \frac{D_{AB} * P_T }{RT(z_2 -z_1)} * ln [\frac{P_T - P_{Al}}{P_T - P_{AO}} ]\)

Here R is the gas constant with value  

         \(R = 8.314 \ m^3 \cdot Pa \cdot mol^{-1} \cdot K\)

             \(N_A = \frac{2.14 *10^{-5} * 1.01325*10^{5} }{8.314 *298 (0.01)} * ln [\frac{1 - 0.1}{1 - 0.9} ]\)

=>           \(N_A = 0.192 \ mol \cdot m^{-2} \cdot \ s\)

The sweetest natural sugar that is found in fruits and vegetables is fructose. Fructose is a monosaccharide, or simple sugar, that is found in fruits, vegetables, and honey. It is known for its sweet taste and is often used as a natural sweetener.

Unlike glucose, which is quickly absorbed by the body and can cause a spike in blood sugar levels, fructose is absorbed more slowly, which makes it a better option for people who are looking to manage their blood sugar levels. Fructose is also a common ingredient in many processed foods, such as soft drinks and candy. While fructose is a natural sugar, it should still be consumed in moderation, as excessive consumption can lead to health problems, such as obesity and type 2 diabetes. Overall, fructose is the sweetest natural sugar found in fruits and vegetables, and is a good option for those who are looking for a natural sweetener that won't cause a spike in blood sugar levels.

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Answer:

You can get 7 answers wrong.

Explanation:

Let's calculate the average

\(\frac{15}{2} \\\\=7.5\)

So if you correctly answer 8 -15  (7.5 is approximated to 8 )questions correctly you will pass.

So you can get 7 answers wrong.

A. someone arranging a deck of cards in order from aces (low) to kings (high) - This action represents a decrease in entropy because it is going from disorder to order, thus decreasing the entropy of the system.

Entropy is a measureable physical characteristic and a scientific notion that is frequently connected to a condition of disorder, unpredictability, or uncertainty. From classical thermodynamics, where it was originally recognized, through the microscopic description of nature in statistical physics, to the fundamentals of information theory, the phrase and concept are utilized in a variety of disciplines. It has numerous applications in physics and chemistry, biological systems and how they relate to life, cosmology, economics, sociology, weather science, and information systems, especially the exchange of information.

Entropy has the effect of making some processes impossible or irreversible, in addition to the need that they not go against the conservation of energy, which is described in the first law of thermodynamics. The second law of thermodynamics, which asserts that isolated systems left to spontaneous development cannot have their entropy decrease over time because they always reach a state of thermodynamic equilibrium where it is highest, is based on the concept of entropy.

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The simplest whole number ratio of percentage of elements will be same according to law of multiple proportions.

Compound -1

ratio:-

\(\\ \sf\longmapsto \dfrac{57.1}{42.9}=1.33\)

Compound-2

ratio

\(\\ \sf\longmapsto \dfrac{72.7}{27.3}=2.66\)

Now compound ratio:-

\(\\ \sf\longmapsto \dfrac{2.66}{1.33}=2\)

Hence verified

The main reservoirs of the carbon cycle are the atmosphere, oceans, land (including vegetation and soils), and fossil fuels. In these reservoirs, carbon exists in both inorganic and organic forms.

The inorganic carbon cycle involves the exchange of carbon dioxide (CO2) between the atmosphere and oceans through processes like photosynthesis and respiration.

Organic carbon, on the other hand, is found in living organisms, dead organic matter, and soil organic matter. It is cycled through processes such as decomposition and consumption by organisms. The interactions between the inorganic and organic carbon cycles occur primarily in the biosphere, where photosynthesis converts inorganic carbon into organic carbon compounds. While inorganic carbon is primarily in the form of CO2, organic carbon is present in complex organic molecules. Both forms of carbon play crucial roles in energy transfer, nutrient cycling, and climate regulation.

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Volume of hydrogen (in l) is produced is 35.20 L

Given:

moles of hcl = 3.143 mol

To Find:

volume of hydrogen

Solution:

2HCl → H2 + Cl2

STP 2*22.4L 22.4L 22.4L

2 mol 1 mol 1 mol

73 gm 2gm 35.5gm

here we can see that 2 mol hcl is producing 22.4 litres of hydrogen

So, 3.143 mol hcl will produce hydrogen = 22.4/2*3.143 = 35.20 litres

Volume of hydrogen (in l) is produced is 35.20 L

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The enthalpy of freezing of the substance is 6.06 kj/g.

Enthalpy is a measure of the total heat content of a system, including its internal energy and the energy required to perform work. The enthalpy of a substance can change due to different physical or chemical processes, such as melting, boiling, or sublimation.

The enthalpy of freezing can be calculated using the enthalpy of condensation and enthalpy of sublimation as follows,

Enthalpy of freezing = Enthalpy of sublimation - Enthalpy of condensation

Enthalpy of freezing = 4.60 kj/g - (-1.46 kj/g)

Enthalpy of freezing = 4.60 kj/g + 1.46 kj/g

Enthalpy of freezing = 6.06 kj/g

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Answer:

No.

Explanation:

El agua no es una sal. El agua tiene enlaces covalentes que comparten electrones. Se requiere un enlace iónico para hacer una sal (en mi definición). Eso es lo que la definición anterior está tratando de decirle en un término técnico.

A buffer is a solution that can resist a change in pH when a small amount of acid or base is added to it. Buffer solutions can resist pH changes because they contain a weak acid and its conjugate base or a weak base and its conjugate acid.A buffer can resist changes in pH because it can neutralize small amounts of acid or base that may be added to it.

The pH of a buffer solution depends on the dissociation constant (K a) of the weak acid in the solution and the ratio of weak acid to its conjugate base.If a small amount of acid is added to the buffer, the base component of the buffer

reacts with the acid to neutralize it, forming the conjugate acid. If a small amount of base is added, the acid component reacts with the base to form the conjugate base of the buffer.A buffer solution will be most effective when the pH of

the solution is close to the pK a of the weak acid component. At this pH, the buffer will be able to neutralize small amounts of acid or base without undergoing a significant change in pH.

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Answer:

i think it is chemical wait no physical

Explanation:

Answer:

The number of electrons in the outermost shell of an atom determines its reactivity. Noble gases have low reactivity because they have full electron shells. Halogens are highly reactive because they readily gain an electron to fill their outermost shell.

Hope this Helps!~

Answer:

D. S (Sulphur)

Explanation:

you couldve just looked this up lol

Step 1:

ok we have to use the formula PV=nRT

p=Pressure (must be converted to atm)= 780 mmHg

1 amt= 760 mmHg use this as a conversion factor

780 mmHg (1 atm/760 mmHg)= 1.026

V= Volume= 5.00 mL = o.5 L

n=number of moles which we have to find first

R= 0.0821

T(convert to Kelvins by adding 273.15 to the celsius temperature)= 135 C + 273.15= 408.15 k

Now plug in->

(1.026 atm)(o.5 L)= n(0.0821)(408.15 K)

(1.026 atm)(0.5 L)= n(33.509115)

(0.513)= n(33.509115)

n(number of moles)= 0.01532 mol

Now we have to convert to moles using Avagodro's number which states that 1 mol = 6.022 x 10^23 molecules or atoms

So 0.01532 mol (6.022 x 10^23 number of molesules)/ (1 mol) = 9.225704 x 10^21 = 9.226 x 10^21 colecules

Step 2

You must transfer pressure into pascals, 780 mm Hg = 103991 Pa

135*C = 408.15 k

then from the equation pV = nRt

n = pV / RT (T in Kelvins, V in M^3)

n = 103991 x 500 x 10^-6 / (8.314 x 408.15)= 0.015322 moles of N2

1 mol of everything is 6.022 x 10^23 particles, so 0.15322 moles is 0.15322 x 6.022 x 10^23 = 9.2269084 x 10^21 molecules

Explanation:

Hope this helps :)

The product that is a precipitate is ZnS(s), which will appear as a solid in the solution. A displacement reaction can be described as one in which a more active substance displaces a less active substance from its compound.

To predict the products, we need to use the double displacement reaction. When Na₂S (aq) and ZnSO₄(aq) are mixed together, they will exchange partners to form Na2SO4(aq) and ZnS(s).
Na₂S (aq) + ZnSO₄(aq) —> Na₂SO₄(aq) + ZnS(s).

A double displacement reaction can be described as a kind of chemical reaction in which the reactant ions exchange places to be new products. Usually, a double displacement reaction is present in the precipitate formation. The chemical bonds between the reactants may be either covalent or ionic.

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Answer:

CO2 is an evil necessary element. co2 is needed for our survival. we need food for survival and food is produced by the plants through photosynthesis. for photosynthesis to take place co2 is one of the vital element. so no co2,no photosyntheseis maeans no food. no food no one will survive.