How many significant figures are in 91010?

1. The right atrium 2. veins 3. lungs 4. heart valves. 5. pulmonary artery   6. Lungs 7. pulmonic valves 8. left atrium.

Circulation is the process by which your heart continuously pumps around five liters (eight pints) of blood throughout our body. our cardiovascular system is made up of our heart, blood, and blood arteries (or heart and circulatory system). Because the majority of the oxygen has been used up by the body and brain, the right side of the heart receives blood that is deficient in oxygen. our lungs then take in a new supply of oxygen as a result of this being pumped to them. In order to be pumped back out to the brain and the rest of our body, the blood then travels back to the left side of the heart.

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813.2 torr was computed as the value.

Air pressure is the force of the air around us, whereas atmospheric pressure is the force of the earth's atmosphere. Tore gauges are used to measure air pressure, while mercury barometers are used to measure atmospheric pressure. The planet's gravitational pull on the gases above its surface produces atmospheric pressure, which depends on the planet's mass, the radius of its surface, the quantity, composition, and vertical distribution of the gases in the atmosphere.

Factor of conversion: 760 Torr per atm

Torr = 1.07 Atm 760

Torr = 813.2

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Melting occurs when a solid changes state into a liquid.

Fusion occurs when a liquid changes state into a solid.

(So, basically, they are opposite of each other)

Hope this helps!

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The correct option is A. Softer, porous, or more permeable rocks weather faster than harder rocks.

Rocks are of different types such as metamorphic, igneous, and sedimentary rocks.

Rocks that are more pliable, porous, or permeable weather more quickly than tougher rocks. Rocks weather more quickly in hot regions than in chilly ones.

In comparison to other rocks, rocks having minerals that break down slowly in water will weather more quickly. The rate of weathering increases with the amount of water present.

Therefore, The correct option is A. Softer, porous, or more permeable rocks weather faster than harder rocks.

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AlT₂B₂ (where T=Fe, Mn, Cr) and AlFe₂₋ₓMnₓB₂ were formed by a technique referred to as arc-melting.

By victimization arc melting to form the quaternary phases AlFe2-xMnxB2 and therefore the ternary phases AlT2B2 (T=Fe, Mn, Cr), these materials are studied and represented.

AlT₂B₂ (where T=Fe, Mn, Cr) and AlFe₂₋ₓMnₓB₂ were formed by a technique referred to as arc-melting.

AlMn₂B₂ and AlCr₂B₂ don't carries with it any form of magnetic ordering.

Nonmagnetic and magnetic attraction cluster in AlFe₂–xMnₓB₂.Ferromagnetism is suppressed by weakening of antibonding T–T interactions.The third phases AlT₂B₂(whereT=Fe, Mn, Cr) and fourth phases AlFe₂–xMnₓB₂ that are shaped by Arc-Melting and powder by X-ray diffraction.

The activity of magnet tells that AlFe₂B₂ could be a ferromagnet with Tₓ=282 K. AlMn₂B₂ and AlCr₂B₂ don't show any form of magnetic ordering within the studied of temperature vary of one.8–400 K.A systematic investigation of solid solutions AlFe₂−xMnxB₂ showed a non-linear modification. The magnetic attraction ordering temperature is step by step small because the content of Mn will increase.Calculation of Quantum chemical and crystal orbital Hamilton population analysis provides a transparent rationalization of the excellence in properties of series of compounds.

Thus, we are able to say that, AlT₂B₂ (where T=Fe, Mn, Cr) and AlFe₂₋ₓMnₓB₂ were ready by a technique referred to as arc-melting.

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The empirical formula of the compound is Fe2O3 and its name is Iron(III) oxide or ferric oxide.

The oxide of iron has 70% of iron by mass.

This means that in every 100 grams of this oxide,70 grams is of iron and the other 30 grams are of oxygen.

To calculate the empirical formula, we have to first find the number of moles of iron and oxygen by dividing the given mass by their molar mass.

Moles of iron = 70/56 = 1.25 moles

Moles of oxygen = 30/16 = 1.875 moles

Now we need to divide the moles of iron and oxygen by the lowest common number i.e. 1.25

Moles of iron/1.25 = 1.25/1.25 = 1

Moles of oxygen/1.25 = 1.875/1.25 = 1.5

The ratio of iron(Fe): to oxygen(O) comes out to be 1:1.5.

Hence, we should multiply this ratio by 2 to get a whole number.

The ratio of Fe:O comes out to be 2:3.

Thus, the empirical formula of the compound is Fe2O3 and its name is Iron(III) oxide or ferric oxide.

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The volume of 0.3 M oxalic acid(C2H4O2) solution containing 22.5 grams of oxalic acid is 833.3 ml.

The molarity(M) of a solution can be expressed by the following formula,

Molarity(M) = Mass of solute/Molar mass of solute x 1000/Volume of the solution

We are given that, the molarity of a solution containing 22.5 grams of oxalic acid(Molar mass= 90 g) is 0.3 M.

Putting these values in the given formula, we can calculate the volume of the solution

0.3 = 22.5/90 x 1000/V

V = 22.5/90 x 1000/0.3

V = 833.3 ml.

Thus, The volume of 0.3 M oxalic acid(C2H4O2) solution containing 22.5 grams of oxalic acid is 833.3 ml.

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The statement which is best supported by the table (see attachment) is: D. Waves W and X are transverse waves, Wave Y could be a longitudinal or transverse wave, and Wave Z is a longitudinal wave.

A wave can be defined as a disturbance in a medium that progressively transfers (transports) energy from a source to another location, especially without the transportation of mass (matter).

In Science, there are three (3) main types of wave and these include the following:

A longitudinal wave is the opposite of a transverse wave and it can be defined as a type of wave that usually travel in the same direction of its oscillation. Thus, the motion of a longitudinal wave is parallel to wave motion.

A transverse wave can be defined as a type of wave in which particles of the medium of propagation oscillates or vibrates (up and down) in a direction that is perpendicular to the direction that the wave moves i.e at right angle to the direction of propagation of the wave.

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Answer:

Waves W and X are transverse waves, Wave Y could be a longitudinal or transverse wave, and Wave Z is a longitudinal wave.

//D edge 2023//

Explanation:

sorry if im wrong , have a great day/night!

If you see the nuclide notation of uranium (u).

The letter in the mid is the symbol of the element.

The number in the bottom left corner is atomic number (Tells you the number of protons)

The number on the upper left corner is the mass number (equal to the mass number ; = the neutrons and protons added together)

At the last, the charge is on the upper right corner, if there is no +ve and -ve symbol then the charge is neutral.

To find the number of neutrons, protons and electron :

1. No. of protons = Atomic Number (Z)

2. No. of neutrons = Mass number (A) - Atomic number(Z)

3. No. of electrons = Atomic number - Charge

To find the charge it is find by the periodic table suppose group 1 alkali metals have +1 charge and in the same way group 16 -2 charge .

Uranium is a radioactive element and hence it is an alpha particle and hence it has a positive charge.

There are many radioactive element who are alpha particles like thorium and plutonium. Beta particles have negative charge.

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Percentage yield = 87.3%

How to find percentage yield ?

As ,the reaction is :

4Fe + 3O2 →2Fe2O3

Molar mass of Fe = 55.8 g

Molar mass of Fe2O3= 159.6 g

According to the balanced equation :

This is the theoretical mass obtained .

Actual mass is 4.77

So, % yield is = (actual /theoretical )/100 =( 4.77/5.46 )/100 = 87.3%

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Amount of water form will be 2.925 gram

2H2 + O2 -------> 2H2O

4 gram + 32 gram 36 gram

2 moles + 1 mole 2 mole

Moles = Given mass/molar mass

Moles of Oxygen = 2.6 gram/32gram = 0.08 moles

Moles of Hydrogen = 3.5 gram/2 gram = 1.75 moles

Here, we can see that Oxygen moles are less than Hydrogen moles so it is the limiting reagent and it will determine how much water will be formed

The substance that is entirely consumed at the end of the chemical reaction is known as the limiting reagent. This limiting reagent is required for the reaction to proceed since it limits the amount of product that can be produced.

32 gram of O2 produces water = 36 gram

1 gram of O2 produces water = 36/32 = 1.12 gram

2.6 gram of O2 produces water = 1.12 x 2.6 = 2.925 gram

Hence, amount of water form will be 2.925 gram

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The nonelectrolyte is a substance that has been known to not ionize in an aqueous solution. The molar mass of the unknown compound at the freezing point of −1.80 ° C is 180.833 g/mol.

The freezing point has been the estimate of the temperature at which the substance is said to change its phase from the liquid to the solid state. It is just the opposite of the melting point.

Given,

ΔTc = -1.8 °C

Kc water = 1.86 °C.Kg/mol

Mass solvent =  100.0 g = 0.1 Kg

Mass solute = 17.5 g

Mass of solution = mass of solute + mass of solvent = 117.5 gm

Molality (m) is calculated as:

molality = solute (mol) ÷ solvent (Kg)

m = ( - 1.8 °C) ÷ ( - 1.86 °C.Kg/mol)

m = 0.9677 mol/Kg

Molar mass can be calculated from molality as:

moles of solute = molality × solvent

moles = 0.9677 mol/Kg × 0.100 Kg H2O

= 0.09677 mol

Now, moles and mass are used to calculate molar mass as:

Molar mass = mass ÷ moles

= 17.5 g  ÷ 0.09677 mol

= 180.833 g/mol

Therefore, the molar mass of the unknown substance is 180.833 g/mol.

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Mole fraction of ethylene is = 0.144  

How to find mole fraction ?

As, Given that vapor pressure = 7.88 torr

pure water vapor pressure = 9.21 torr

∆P solvent = (X Solute)(Pº solvent)

∆Psolvent = change in vapor pressure = 9.21 torr - 7.88 torr = 1.33 torr

Xsolute = mole fraction of the solute = ?

Pºsolvent = vapor pressure of the pure solvent = 9.21 torr

1.33 torr = (Xsolute)(9.21)

Xsolute = 1.33 torr/9.21 torr)

Xsolute = 0.144

Hence the mole fraction of ethylene is = 0.144  

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Is Fe+S classified as as compound

Iron and sulfur are both elements from the periodic table of elements each one has its own unique physical and chemical properties iron is a metal, and sulfur is a nonmetal. when these two are heated together, the iron atoms combine with the sulfur atoms to make a compound known as iron sulphide when iron and sulphur are mixed then the reaction is called as redox reaction or oxidation reduction reaction in that reaction Fe loses electron that is Fe is undergoing in oxidation and we know that the substance which itself undergo oxidation act as a reducing agent so in this case Fe is the reducing agent. Fe+S is a compound because compound means the substance made from two or more different element that have been chemically joined and mixture means made up of two or more chemical component that are not chemically joined called mixture so given iron sulphide is a compound.

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The concentration of copper in the solution is

[tex]5.1 \times 10^{18} \: M.[/tex]

The volume of the solution = 1.00 L

[tex]Moles \: of \:Cu(NO_{3}) _{2} = 2.50 \times 10 {}^{ - 4} [/tex]

[tex]Moles \: of \: Ethylenediamine = 1.20 \times 10.3[/tex]

[tex]k _{f} = 1.00 \times 10^{20} [/tex]

Overall balanced equation of reaction is,

[tex]Cu^{2 + }(aq) \: + 2en \: (aq)→ Cu(en) ^{2 + }_{2}(aq)[/tex]

[tex]Moles \: of \:Cu(NO_{3}) _{2} =0.00025 \: mol[/tex]

Mole ratio for,

[tex]Moles \: of\:Cu(NO_{3}) _{2}: en[/tex]

[tex]2: 1[/tex]

[tex]Moles \: of \: en = 0.000250 \times 2[/tex]

[tex] = 0.00050 \: moles[/tex]

Remained moles of en are= (0.00120-0.000500)

[tex] = 0.000700 \: moles[/tex]

The concentration of copper in the solution is,

[tex]k_{f} = \frac{Cu(en)^{2 + }_{2} }{Cu^{2+}en^{2} }[/tex]

[tex]1.00 \times 10 ^{20} = \frac{0.000250}{(Cu )^{2 +} \times (0.000700)^{2 + } }[/tex]

[tex] = 5.1 \times 10^{18} \: M.[/tex]

Therefore, the concentration of copper in the solution is

[tex]5.1 \times 10^{18} \: M.[/tex]

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Lithium has two isotopes. Lithium-6 has a atomic mass 6.01512 amu and Lithium-7 has a atomic mass 7.01601 amu. The average atomic mass of Lithium is 6.941 amu.

Let's take the relative abundance of Lithium-6 as X and the relative abundance of Lithium-7 as Y. The sum of the relative abundances is always taken to be 1.

X+Y=1

X=1-Y

The average atomic mass can be expressed as the following, based on the atomic masses and relative abundance of the two isotopes

6.941 = X(mass of Li-6) + Y(mass of Li-7)

6.941= 1-Y(6.01512) + Y(7.01601 )

from the above equation, Y=0.92506

Solving for X

X=0.07494

Therefore, the relative abundance of lithium-7 is 92.506% and that of lithium-6 is 7.494%

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The temperature of liquid nitrogen (LN), an inert cryogenic fluid, is 196 °C (320 °F). To drop the temperature of the concrete as much as is possible without causing it to freeze, LN is directly injected by lances into the batch water storage tank, the aggregate, or the mixer.

Cryopreservation is the process of preserving live cells, tissues, and other biological samples by placing them in a deep freezer at extremely low temperatures. The sample is typically stored at 196°C or lower. All of a cell's biological processes come to an end at such low temperatures, and the cell dies.

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Answer: 4.136 g

Explanation:

1000 mg=1 g

4136 mg * 1 g/1000 mg=

4136*1/1000=

4136/1000=4.136 g

Explanation:

[tex] \frac{p1v1}{n1t1} = \frac{p2v2}{n2t2} (ideal \: gas \: equation) \\ \frac{v1}{t1} = \frac{v2}{t2} \\ convert \: degrees \: to \: kelvin \: \\ \frac{1.5l}{297k} = \frac{v2}{373k} \\ v2 = 1.88l \\ it \: increased \: by \: 80\%[/tex]

The cell potential at 250c for the following galvanic cell

pb(s)|pb2 (1.0m)||cu2 (1.0 x 10-4 m)|cu(s)

is 0.345V.

It is a device that is used for the conversion of the electrical energy of the redox reactions into a chemical energy.

The reaction in which reduction and oxidation reaction both take place in the reaction is known as redox reaction.

Oxidation reaction are those reaction in which compound or substance looses its electron. In this type of reaction, oxidation state of an element increasing.

Reduction reaction are those reaction in which compound or substance accept the electron. In this type of reaction, oxidation state of an element goes on decreasing.

Reaction at cathode:

Cu+2 + 2e ------ Cu E°(anode) = -0. 126V

Reaction at anode:

pb ------- pb(+2) + 2e E°(cathode) = 0.337

E°cell = -0.126 -0.337

= -0.463V.

As we know that,

E cell = E°cell -0.059/2(log([cathode]/[anode])

= -0.463 - (0.059/2) × (-4)

= -0.463 + 0.118

= 0.345V

Thus, we concluded that the cell potential at 250c for the following galvanic cell

pb(s)|pb2 (1.0m)||cu2 (1.0 x 10-4 m)|cu(s)

is 0.345V.

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Explanation:

Bromine is a halogen in group VII A of the periodic table with atomic number 35,an atomic weight of 79.91, and a density of 3.12 Mg.In the solid state it forms a cubic crystal with a melting point of -72 C and boiling point of 58 C.

Bromine's liquid state at 25°C indicates melting point below 25°C and boiling point above 25°C.

The observation of bromine being a liquid at 25°C reveals important details about its melting and boiling points. Since it exists as a liquid at this temperature, it signifies that its current state is beyond its melting point.

Therefore, bromine's melting point is below 25°C. However, since bromine has not transitioned into a gaseous state at 25°C, it indicates that its temperature is still below its boiling point. This suggests that the boiling point of bromine lies above 25°C.

The relatively narrow temperature range between its melting and boiling points makes bromine unique among elements and allows it to exist as a liquid at room temperature.

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Answer:

Explanation:

in metal IE 1 < IE 2 < IE 3. why

17.85 mL of 3.0 M stock solution of nitric acid is needed to make a 150 mL 0.357 M nitric acid.

The dilution of a stock solution can be solved by using the formula below, which indicates that the concentration of the solution changes but the number of moles of the solute remains the same.

(concentration of stock solution)(volume of stock solution) = (concentration of diluted solution)(volume of diluted solution)

Given:

(3.0 M)(volume of stock solution)=(0.357 M)(150 mL)

volume of stock solution = [(0.357 M)(150 mL)] / (3.0 M)

volume of stock solution = 17.85 mL

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The positive-positive repulsion is expected to slow the particles down slightly as they travel through the atoms since the plum pudding model predicts that the positive charge is distributed evenly throughout the atom. However, we do not anticipate any deflection of the particles.

The Rutherford model was not accepted.

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Answer:

0.25 g/cm

Explanation:

First, you multiply 10 *10 *10 and you get 1000. Then you divide it by 4000 and since 1000 is 1/4 of 4000 you get 0.25 or 1/4.

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Law of definite composition: As long as something has the same formula, its mass will be the same.

According to the Law of Definite Proportions, a chemical compound will always include the same weight proportions of each element, regardless of the quantity or source. For instance, 21.5 grammes of carbon and 28.5 grammes of oxygen make up a 50-gram sample of carbon monoxide.

Ibuprofen is a medication used to treat pain, fever, and inflammation, and is a member of the nonsteroidal anti-inflammatory drug (NSAID) family. This includes menstruation pain, migraines, and rheumatoid arthritis. The patent ductus arteriosus of a premature newborn can also be sealed with this technique.

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