What is the fluid speed at point in the pipe where the cross-sectional area is 0.105m2 ?

Answer:

31.0

Explanation:

Lets convert to grams

3.35 x 1000 = 3350 grams of N2O5

3350 / molar mass of N2O5 (108 grams) = 31.0 moles

The balanced chemical equation is [tex]Zn + 2HCl[/tex]  →  [tex]ZnCl_{2} + H_{2}[/tex] .

The given chemical equation [tex]Mg_{3} N_{2} + H_{2}O[/tex]   →   [tex]3MgO + 2NH_{3}[/tex] is not a balanced  chemical equation because number of hydrogens and oxygens are not same on both sides. Balanced chemical equation for this reaction will be [tex]Mg_{3} N_{2} + 3H_{2} O[/tex]  →  [tex]3MgO + 2NH_{3}[/tex]..

The given chemical equation [tex]C_{3} H_{8} + 5O_{2}[/tex]  →  [tex]H_{2} O + 3CO_{2}[/tex] is not a balanced  chemical equation  because number of hydrogens and oxygens are not same on both sides. Balanced chemical equation for this reaction will be[tex]C_{3} H_{8} + 5O_{2}[/tex]  →   [tex]4H_{2} O + 3CO_{2}[/tex].

The given chemical equation [tex]Zn + 2HCl[/tex]  →  [tex]ZnCl_{2} + H_{2}[/tex] is already a balanced chemical equation.

The given chemical equation [tex]3H_{2} SO_{4} + 2Fe[/tex]  →  [tex]Fe_{2} (SO_{4} )_{3} + H_{2}[/tex] is not a balanced  chemical equation because number of hydrogens are not same on both sides.  Balanced chemical equation for this reaction will be [tex]3H_{2} SO_{4} + 2Fe[/tex]  →  [tex]Fe_{2} (SO_{4} )_{3} + 3H_{2}[/tex] .

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The heat of vaporization is always greater than the heat of fusion because gas molecules have the largest intermolecular space and lowest intermolecular interaction.

The term latent heat refers to the kind of heat that can not be detected hence the term ‘latent’. It is the heat that does not lead to temperature change. Rather the heat energy is used to break up the secondary bonds that hold the molecules and the bonds that hold the substance together in order to free the molecules of the substance.

Now if we consider water,  propane, and carbon dioxide. We could see that water has the strongest intermolecular force followed by carbon dioxide and then propane. This is because water molecules are held together by hydrogen bonds while the propane molecules are only held together by the weak Van Der Walls forces.

We can now see that when we compare  the heats of heat of fusion to the heat of vaporization, the heat of vaporization is always greater than the heat of fusion because gas molecules have the largest intermolecular space and lowest intermolecular interaction.

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Looking at the forms of neon in the question as shown, we can see that;  their atomic masses differ. Option D

The term isotopes has to do with the atoms that have the same atomic number but do not have the same mass number. The mass number is the sum of the number of protons and the neutrons. Given that the number of protons is a constant and it is the identity of the element, we are now left with the understanding that the difference between the mass numbers of the isotopes must stem from the very given fact that the neutrons that are found in the both isotopes are just not of the same number.

Having said all of these, we could now look at the isotopes that we have which are the isotopes of neon that have all been labeled as; neon-20, neon-21, and neon-22.

Following from the explanations that have been afore given above, we could easily arrive at the conclusion that; their atomic masses differ.

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Answer:

Tetravalent atom or tetra-atom

The actual, significant effect of 2,3-bisphosphoglycerate on oxygen binding by hemoglobin is Kd for oxygen increases in peripheral tissues.

Kd is a dissociation constant.

A lower dissociation constant (Kd) means tighter binding of oxygen.

When 2,3-bisphosphoglycerate (2,3-BPG) levels increase, hemoglobin release oxygen.

2,3-Bisphosphoglycerateis a three carbon isomer of the glycolytic intermediate 1,3-bisphosphoglycerate. It is present in human red blood cells (erythrocyte).

2,3-bisphosphoglycerate interacts with deoxygenated hemoglobin and decrease his affinity for oxygen, so it allosterically promotes the release of the remaining oxygen molecules.

2,3-bisphosphoglycerate promotes oxygen release in peripheral tissues.

Hemoglobin is the oxygen-transport metalloprotein in erythrocytes that contains iron ions.

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360.87g of sodium reacted with 497g of chlorine to form 819g of sodium chloride (NaCl).

Chlorine and sodium react to form sodium chloride (NaCl). Below is the balanced reaction:

Cl2 + 2Na = 2NaCl.

1 mole of Na interacts with 1 mole of Cl2 to create 2 moles of NaCl. Sodium's atomic mass is 23 and chlorine's molar mass is 71, while sodium chloride's molar mass is 58.5.

As a result, the reaction between 46g Na and 71g Cl2 yields (2 X 58.5)g = 117g of NaCl.  Na fully interacts in response to the question, indicating Na as the limiting reactant. Thus, the amount of Na that reacts is equal to the amount of NaCl that is created.

Produced NaCl = 819g = (819/58.5) moles = 15.69 moles. The amount of Na that reacted was 15.69 moles = 15.69 X 23g = 360.87g.

Result:

Amount of Na reacted is 360.87g.

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Surface processes such as erosion, movement, weathering, and the deposition of sediment can modify surface features, such as mountains, or create new features, such as canyons.

Have a great day!

The surface of the Earth is constantly changing as a result of geoscience processes such as weathering, erosion, and deposition. Systems on the planet interact to influence Earth's past, present, and future.

Geoscience investigates the processes that shape the Earth's surface, the resources humans utilize, and how water and ecosystems are related. It covers much more than just rocks and volcanoes. Chemistry, physics, biology, and arithmetic, as well as other scientific disciplines, are used in geoscience.

The surface of the Earth is constantly changing as a result of geoscience processes such as weathering, erosion, and deposition. Systems on the planet interact to influence Earth's past, present, and future.

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The model shown should demonstrate why planets do not end up going into the sun as follows: The planets move too fast to go into the sun. (option A).

Planets are the bodies that orbit round the sun. The planets are seven in number as follows:

According to this question, a student looks at an animated model of the planets orbiting the sun. In reality, this planets do not go into the sun because they are far away from the sun.

The Earth as a planet for example is not moving fast enough to escape the sun's gravity and leave the solar system, but it is going too fast to be pulled into the sun. Therefore, it keeps going around and around in an orbital manner.

Therefore, the model shown should demonstrate why planets do not end up going into the sun as follows: The planets move too fast to go into the sun.

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The mass (in grams) of the material that has a density of 2.69 g/mL and a volume of 13.4 mL is 36.046 g

The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as

Density = mass / volume

With the above formula, we can determine the mass of the material. Details below

The mass of the material can be obtained as illustrated below:

Density = mass / volume

Cross multiply

Mass = Density × Volume

Mass of material = 2.69 × 13.4

Mass of material = 36.046 g

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12.5 volume in ml of 0.05 m Sulphuric can be prepared from 2.5 g sulphuric acid and sufficient water.

What is Volume?

Volume is a measurement of three-dimensional space that is occupied. It is frequently expressed numerically using imperial or SI-derived units. Volume and the notion of length are connected.

As a result, we can observe that 0.5 moles of sulphuric acid are required to neutralise 1 mole of NaOH. Now let's figure out how much NaOH is specified.

NaOH is assumed to weigh 2.5 g.

NaOH has a molar mass of 40 g.

=> 62.5 millimoles of NaOH are equal to 2.540 moles.

The required amount of sulfuric acid is 62.5/2 millimoles, or 31.25 millimoles.

We now understand that millimoles equal molarity times volume (in ml)

replacing the specified values,

31.25 = 2.5 * V

=> V = 12.5 ml

As a result, 12.5 cc of sulfuric acid is needed.

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The name of the compound is manganese (II) sulfate.

In most cases, the inorganic compound with the formula [tex]MnSO_{4} . H_{2} O[/tex] is referred to as manganese(II) sulfate. A manganese(II) salt with great commercial value is this light pink deliquescent solid. For purposes that are compatible with sulfates, manganese sulfate is a relatively water- and acid-soluble manganese source.

When a metal is substituted for one or both of the hydrogen atoms in sulfuric acid, salts or esters known as sulfate compounds are created.

Blacks, browns, and purples are produced through the use of manganese as a coloring agent in bodies and glazes. Most glaze melts can easily dissolve smaller amounts of manganese; however, at concentrations above 5%, the manganese will precipitate and crystallize. Metallic surfaces are likely when a glaze contains a lot of metal (like 20%).

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The molar concentration of the sugar solution is 0.815M

The best approach to describe a solute concentration in a solution is by molar concentration. According to the formula M = mol/L, molarity is defined as the total number of moles of solute dissolved in one litre of solution.

Given:

Mass, m = 74.2g

Molar mass, mm = 342.30g/mol

Volume, v = 265.7ml

To find:

Molar concentration, M = ?

Formula:

Molar concentration, M = mole / dm^3 of solution

Calculations:

No. of moles = Mass, m / molar mass, mm

No. of moles = 74.2 / 342.3

No. of moles = 0.216 mol

Molar concentration, M = 0.216 / 0.265

Molar concentration = 0.815M

Result:

The molar concentration of the sugar solution is found to be 0.815M

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The point during the fall will the potential and kinetic energy be equal is B. 1/2 of the way down.

It should be noted that the point when the potential and kinetic energy be equal will be at the midpoint of the initial height.

Therefore, the object possesses potential energy when at rest and then kinetic energy when in motion.

When KE = PE

We can deduce that KE+PE = MGH and  PE+ PE = MGH

This implies that MGH + MGH= 2MGH and  2H = H

Therefore, the point during the fall will the potential and kinetic energy be equal is B. 1/2 of the way down.

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Answer:

Sand is not made of cells

Answer:

C. sand

Explanation:

Bacteria is living so it is made of cells. A leaf is living so it is also made of cells. A snail is also a living thing, so it is made of cells. The only thing there that is not living is sand. So sand is not made of cells.

Hope this helps! :)

Answer:

1: A salt plus hydrogen gas

2: Yes, the metals which react with cold water are; sodium, calcium and potassium. Magnesium does not react with cold water. Metals like aluminum, iron and zinc do not react either with cold or hot water. Metals such as lead, copper, silver and gold do not react with water at all.

3: There is no reaction between dilute hydrochloric acid or sulfuric acid and the metals below hydrogen in the reactivity series.

4: Yes. The product that forms is called rust.

These reactions are exergonic and endergonic.

An exergonic is spontaneous reaction. It occurs without the addition of external energy. ΔG (the change in Gibbs free energy) is negative.

An endergonic reaction requires free energy to proceed. ΔG (the change in Gibbs free energy) is positive.

Balanced chemical equation for reaction of the oxidation of glucose:

C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + energy

C₆H₁₂O₆ is molecule of glucose

O₂ is molecule of oxygen

Balanced chemical equation for reaction of the production of glucose:

6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂.

Plants convert solar energy into the chemical energy of sugars.

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solids are not compressible, this is why it has a fixed shape

The force required to accelerate a 10 kg object at 1 M/S/S  is 10 N.

Force is defined as an action that has the capability of changing the motion of an object.It has both magnitude as well as direction owing to which it can be described as a vector quantity.

It's SI unit is Newton and is represented by symbol F.It can be measured by instruments named force gauge,spring scale and load cell.It is an external agent which can change the body's state of motion or rest.

There are two types of forces

1) contact force

2)non-contact force

Force is calculated by the formula,

F=m×a

where m=mass and a=acceleration

In the given problem ,m=10 kg and a=1 ms[tex]^-2[/tex]

substituting the values in the formula,

F=10×1=10 N.

Thus, the force acting on object of 10 kg  is 10 N when acceleration is 1 ms[tex]^-2[/tex].

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8.6057 g iron is plated out of the solution.

The process of depositing a layer of one metal over the surface of another metal by passing electric current is called electroplating. Electroplating of metals is done to protect them from corrosion and for decoration purpose. For example, the vessels of iron are electroplated with copper or silver or gold to make it attractive and to protect from rusting.

Given,

Current = 4.59 A

Time = 1.80hr

Given solution is Fe(NO3)2

Now,

we have to find out the iron which is plated out of the solution

So,

(4.59 C/sec) (6480 sec) = 29,734.2

29,734.2 C / 96485 C/mol =0.3082 mole of electrons passed

Fe2+ + 2e- ---> Fe

0.3082 mol e- / 2 mol e- per mole Fe = 0.1541 mol Fe

(0.1541 mol) (55.845 g/mol) = 8.6057 g.

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The change in entropy of our body will be 5.03 kJ.

Entropy is a thermodynamic function that tells us about the degree of disorder of a particular system. It is represented using the letter “S”.

The change in entropy of a system is given by the following equation

ΔS = ΔH/T

Here ΔH is the heat released

T is the temperature of the system

In the given case, glucose is given.

The value of ΔH for one-mole glucose is 2808 kJ/mol.

The mass of one-mole glucose is 180 g, therefore 100 g of glucose has

ΔH = 2808/180 x 100 = 1560 kJ/mol.

Putting ΔH= 1560 kJ and T= 37° C = 310 K in the above equation

ΔS = 1560/310

ΔS = 5.03 kJ/K

Thus, the change in entropy of our body will be 5.03 kJ.

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The ph at the equivalence point in the titration of 100 ml of 0.10 m HCN with 0.10 m NaOH is 11.04.

To ascertain the concentration of an identified analyte, titration is a typical laboratory technique for quantitative chemical analysis. A standard solution with a known concentration and volume is prepared as the reagent, also known as the titrant or titrator.

The food business uses titration extensively as an analytical method. It enables food producers to estimate the concentration of a reactant in a sample. For instance, it can be used to determine a food's salt or sugar content or the amount of vitamin C or E, which affects the color of the product.

[tex]HCN + OH^{-}[/tex] →[tex]H_{2}O + CN^{-}[/tex]

At the equivalence point, 10 mmol of cyanide ions are held in 200 mL of solution.

[[tex]CN^{-}[/tex]] = 10 mmol/200 mL = 0,05 M

Kb = [tex]\frac{ 1.0E^{-14} }{4.9E^{-10} }[/tex]

Kb = 2.0E-5 corresponding to [tex]CN^{-}[/tex] + [tex]H_{2}O[/tex]= HCN + [tex]OH^{-}[/tex]

Kb =[tex]\frac{[HCN][OH^{-}}{CN^{-}}[/tex]

y=0.0011 M =[[tex]OH^{-}[/tex]]

pOH = 2.96

pH = 14.00 - pOH = 11.04

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The valence orbitals of a central atom surrounded by three regions of electron density consist of a set of three sp2 hybrid orbitals.

In sp2 hybridization the one s-orbital mixes with only two 2p-orbitals and form three sp2 hybrid orbitals (see the picture below).

When atomic orbitals hybridize, the valence electrons occupy the hybrid orbitals.

For example, central boron atom in boron hydride (BH3) has three sp2 hybrid orbitals. The molecule of boron hydride is trigonal planar. The boron atom form three single bonds with hydrogen atoms. The approximate H-B-H bond angle is 120°.

Other examples are molecules C2H4 (ethene), ClNO (nitrosyl chloride) and CH2O (formaldehyde).

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The final volume of the balloon will be 316.6 ml

Given,

V1= 250 ml

P1= 760 mm Hg

V2=?

P2= 600 mm Hg

From the given question, the final volume can be calculated using Boyle's law.

The link between a gas's pressure, volume, and temperature is shown by Boyle's law. It asserts that under constant temperature, a gas's pressure is inversely proportional to its volume.

Boyle's law is valid only for ideal gas.

Pressure and volume are represented by a rectangular hyperbola on the graph.

P ∝ 1/V or PV = K

∴P1 x V1  = P2 x V2

⇒ 250 x 760 = 600 x V2

⇒190000 = 600 x V2

⇒190000/ 600 = V2

⇒V2 =  316.6 ml

Hence, the new volume of the balloon will be 316.6 ml.

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From the question, we can see that; the wagon has more gravitational potential energy at point Y than point X.

We know that energy is the ability to do work. Work is said to be done when the force applied moves a distance in the direction of the force. In this case, we could say that there are several forms of energy such as;

As such, we can see that the Wagon is at higher elevation at point Y than on point X. Recall that the gravitational potential energy has to do with the height of the object.

Having said all these, it is now possible to conclude that; the wagon has more gravitational potential energy at point Y than point X.

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Atomic nuclei are arranged in a regular pattern is a characteristic of the electron sea model for metallic bonding.

The electron sea model is a popular model for metallic bonding. In this model, atoms are arranged in a regular pattern and each atom has a "sea" of electrons around it. This sea of electrons is responsible for the metallic bond.

The main advantage of the electron sea model is that it can explain the properties of metals very well. For example, why metals are good conductors of electricity and heat.

One of the drawbacks of the electron sea model is that it doesn't explain why some metals are magnetic. This is because the model assumes that all of the electrons are in the same orbital and spin in the same direction. However, we know that some electrons do spin in the opposite direction, which creates a magnetic field.

Overall, the electron sea model is a good way to understand the basics of metallic bonding. However, it doesn't explain everything and there are some limitations to the model.

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Answer:

Electrons flow easily between metal nuclei

Explanation: