in class 1500 students 1200 present find absent percentage​

Answer:

parent and offspring

Explanation:

I think probably what the question is referring to is in the context of biology, the "original organism" is known as the parent. The young that they reproduce are known as the offspring.

The offspring could be formed by the sexual reproduction of two parental organisms, or the asexual reproduction of just one parental organism.

Explanation:

The retention of analytes in gas chromatography can be increased by selecting mobile phase that is a weaker solvent. When the mobile phase has a lower solvent strength, solutes spend proportionally more time in the stationary phase and take longer to elute.

a.) Plants that thrive in the shade are often able to hold on to sunlight for extensive periods of time; they're in a sense like the camels of the plaNt WoRld.

b.) Though artificial lights are not nearly as beneficial as the sun, one could invest in one of them plant growing light thingies, but sun-loving plants might be sad if u do this instead of letting them soak in ePic rays from the sun.

Answer: Metaphase

Explanation:

Metaphase is SECOND stage of mitosis, that follows prophase and comes before anaphase, during which condensed chromosomes become aligned before being separated.

During Metaphase, the chromosomes become visible due to the condensation, and the success of this stage determines whether anaphase will occur.

Therefore, metaphase is the second stage of mitosis.

Answer:

Separation method for various ingredients are

1. Paneer from curdled milk.  - Filtration

2. Chalk powder from water.  - Filtration

3. Sand from salt solution. - Evaporation

4. Saw dust from water.  - Skim off, sieve or filter

5. Tea leaves from brew. - Filtration.

Explanation:

By the help of a muslin cloth the paneer is separated from the curdled milk, the process is called as the filtration. The paneer will remain in the cloth and curdled milk will be removed. Separation of chalk powder from water is very easy by the process of filtration, after the filtration the chalk powder retentate and the filtrate obtained is the water in absence of chalk.  Salt and sand water separation can be done with the help of evaporation. Separation of the saw dust from water takes place by the method of sieving or sedimentation. The tea leaves are separated from brew by filtration.

Answer:

148x +7856y

Explanation:

The element XCI represented in Roman numerals corresponds to the atomic number of Protactinium. However, ΧΗ does not correspond to any known element in the periodic table.

The elements you've mentioned, X and ΧΗ, do not correspond to any known chemical elements in the periodic table. Chemical elements are typically represented by their chemical symbols, which are one or two letters derived from their English or Latin names. For example, "H" represents hydrogen, "O" represents oxygen, "C" represents carbon, and "Fe" represents iron.

It's possible that the symbols "X" and "ΧΗ" do not correspond to any naturally occurring elements or may not be recognized in the context of the periodic table. If you have more information or context regarding these symbols, please provide it, and I will do my best to assist you further.

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Answer:

gamma ray

Explanation:

Gamma emission results in the release of energy without any apparent change in mass or nuclear charge.

Properties of Gamma radiations:

Gamma radiations are high energy radiations having no mass.

These radiations are travel at the speed of light.

Gamma radiations can penetrate into the many materials.

These radiations are also used to treat the cancer.

Lead is used for the protection  against gamma radiations because of its high molecular density.

The lead apron are used by the person when treated with gamma radiations.

Lead shields are also used in the wall, windows and doors of the room where gamma radiations are treated, in-order to protect the surroundings.

Answer:

gamma ray

Explanation:

Answer: 612C

Explanation: 49B + 24He —> 612C + 01n

Explanation:

Reversible reactions that happen in a closed system eventually reach equilibrium. At equilibrium, the concentrations of reactants and products do not change. But the forward and reverse reactions have not stopped - they are still going on, and at the same rate as each other.

Every reaction strives to reach a state of chemical equilibrium, which is the point where both the forward and backward processes are occurring at the same pace. The concentrations of the reactants and products are constant at equilibrium because the forward and reverse speeds are equal.

Chemical equilibrium is the state of a chemical process where both the reactants and products are present in concentrations that have no further tendency to change over time, preventing any discernible change in the system's properties.

When a chemical reaction is reversible, equilibrium is reached when the rate at which the forward reaction is moving equals the rate at which the reverse reaction is moving.

Even though the two reactions proceed at equal but opposite rates, there are no additional changes in the reactant and product concentrations. At some point, the forward and reverse reaction rates are identical; the rate at which reactants transform into products is the same as the rate at which products transform into reactants.

Thus, Every reaction strives to reach a state of chemical equilibrium, which is the point where both the forward and backward processes are occurring at the same pace.

To learn more about chemical equilibrium, follow the link;

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Explanation:

3*2=6

12x+11=23x

23x+6=29x

x=2

Answer:

 (NH₄)₃PO₄ (l) + Al(NO₃)₃(l) -----------→  AlPO₄(l) + 3NH₄NO₃(l)

Explanation:

Data Give:

Reaction between ammonium phosphate solution and solution of aluminum nitrate

Details:

To write a balanced chemical equation we have to know formula units of compounds or molecules

Formula units

ammonium phosphate : (NH₄)₃PO₄

aluminum nitrate: Al(NO₃)₃

ammonium nitrate: NH₄NO₃

Now to write a chemical equation

So the Reaction will be

                      (NH₄)₃PO₄ + Al(NO₃)₃ -----------→  AlPO₄ + NH₄NO₃

Now balance the Chemical equation

                     (NH₄)₃PO₄ + Al(NO₃)₃ -----------→  AlPO₄ + 3NH₄NO₃

Now write the phase Symbols

                     (NH₄)₃PO₄ (l) + Al(NO₃)₃(l) -----------→  AlPO₄(l) + 3NH₄NO₃(l)

all compounds in the reaction are in liquid form and soluble in water

*** Note:

There is no aluminum nitrite in chemicals formulas

Also ammonium nitrite can not be used in pure isolated form due to its highly instability

Answer:

A. 4 Al + 3 O2 —> 2 Al2O3

Explanation:

4Al + 3O2 —> 2Al2O3

There are four aluminium and six oxygen atoms on both side of equation so this equation follow the law of conservation of matter.

Law of conservation of mass:

According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.

Explanation:

This law was given by french chemist  Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.

For example:

In given photosynthesis reaction:

6CO₂ + 6H₂O + energy → C₆H₁₂O₆ + 6O₂

there are six carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of equation so this reaction followed the law of conservation of mass.

Final answer:

Option A correctly illustrates the conservation of matter as the chemical equation is balanced with 4 aluminum atoms and 6 oxygen atoms on each side, adhering to the principle that matter is neither created nor destroyed in a chemical reaction.

Explanation:

The conservation of matter is a principle in chemistry that states matter is neither created nor destroyed in a chemical reaction. To illustrate this, we examine the chemical equations provided to see if they are balanced—that is, if they have the same number of each type of atom on both sides of the equation.

Therefore, option A – 4 Al + 3 O2  —> 2 Al2O3 – correctly illustrates the principle of conservation of matter because the reaction is balanced with equal numbers of atoms on both sides of the equation.

Answer:

dehydration process is occurring in this process.

Concentrated sulfuric acid sometimes used as drying agent because it has a very strong affinity for water and can be used to dehydrate means removal of water occur. Removing of water from reactant compound results in formation of double bond in product compound.

The given reaction involves the dehydration of ethanol ([tex]CH_3CH_2OH[/tex]) in the presence of sulfuric acid ([tex]H_2SO_4[/tex]) and heat, resulting in the formation of ethylene ([tex]CH_2CH_2[/tex]). This type of reaction is known as an elimination reaction. Specifically, it is a dehydration reaction, where water ([tex]H_2O[/tex]) is removed from the starting material to form the product.

The reaction described involves the dehydration of ethanol ([tex]CH_3CH_2OH[/tex]) in the presence of sulfuric acid ([tex]H_2SO_4[/tex]) and heat, resulting in the formation of ethylene ([tex]CH_2CH_2[/tex]).

Dehydration reactions are a type of elimination reaction where a molecule of water is removed from the starting material to form a new compound.

In this case, the hydrogen and hydroxyl (OH) groups from adjacent carbon atoms in ethanol are eliminated to form a double bond between the carbon atoms, resulting in the formation of ethylene.

Sulfuric acid acts as a catalyst, facilitating the removal of the water molecule from the ethanol molecule. The heat provides the energy required to drive the reaction forward.

Overall, this reaction is an example of a chemical transformation that involves the removal of water to form a new compound.

Answer:

Lower than the specific heat capacity of water

Explanation:

Specific heat capacity of a material is defined as the amount of heat needed to raise 1 g of that substance by [tex]1^oC[/tex]. Specific heat capacity is typically used in the equation which relates heat transfered to the product of specific heat capacity, mass and change in temperature, given by:

[tex]Q = cm\Delta T[/tex]

In this problem:

[tex]Q = 420 J[/tex]

[tex]m = 7 g[/tex]

[tex]\Delta T = 30^oC[/tex]

We may simply rearrange this equation for specific heat, c, in order to solve for its value:

[tex]c = \frac{Q}{m\Delta T} = \frac{420 J}{7 g\cdot 30^oC} = 2 \frac{J}{g^oC}[/tex]

We know that the specific heat capacity of water is:

[tex]c_w = 4.184 \frac{J}{g^oC}[/tex]

The value we obtained is lower than the specific heat capacity of olive oil.

The specific heat of olive oil is approximately 2 J/g °C, which is less than the specific heat of water.

The specific heat of olive oil can be calculated by using the formula: q = mcΔT, where q is the heat energy absorbed, m is the mass of the substance, c is the specific heat, and ΔT is the change in temperature. In this case, we are given the heat (q) as 420 J, the mass (m) as 7 g, and the change in temperature (ΔT) as 30 °C. Plugging these values into the formula, we get 420 J = c * 7 g * 30 °C. Solving for c, we find that the specific heat of olive oil is approximately 2 J/g °C.

Comparing this specific heat value to the specific heat of water, which is 4.184 J/g °C, we can conclude that the specific heat of olive oil is less than the specific heat of water.

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Nitrogen is 1.25 g/L

Sulfur dioxide is 2.86 g/L

Methane is 0.714 g/L

Hope I helped :)

Explanation:

The formula used :

[tex]PM=dRT[/tex]

Where:

P = pressure of the gas

M = Molar mass of the gas

d = Density of the gas

T = temperature of the gas

R = Universal gas constant = 0.0821 atm L/mol K

A.

The density of the gas at STP, d = 1.25 g/L

Pressure of the gas = 1 atm

Temperature of the gas = T = 273 K

[tex]M=\frac{dRT}{P}=\frac{1.25 g/L\times 0.0821 atm l/mol k\times 273 K}{1 atm}[/tex]

M = 28.01 g/mol

Molar mass of nitrogen gas =28 g/mol ≈ 28.01 g/mol

The density of nitrogen gas at STP is 1.25 g/L.

B.

The density of the gas at STP, d = 2.86 g/L

Pressure of the gas = 1 atm

Temperature of the gas = T = 273 K

[tex]M=\frac{dRT}{P}=\frac{2.86g/L\times 0.0821 atm l/mol k\times 273 K}{1 atm}[/tex]

M = 64.10 g/mol

Molar mass of sulfur dioxide gas = 64g/mol ≈ 64.10 g/mol

The density of sulfur dioxide gas at STP is 2.86 g/L.

C.

The density of the gas at STP, d = 0.714 g/L

Pressure of the gas = 1 atm

Temperature of the gas = T = 273 K

[tex]M=\frac{dRT}{P}=\frac{0.714 g/L\times 0.0821 atm l/mol k\times 273 K}{1 atm}[/tex]

M = 16.00 g/mol

Molar mass of methane gas = 16 g/mol

The density of methane gas at STP is 0.714 g/L.

Answer:

Physical Property

Explanation:

Magnetism is temporary untill you seperate the objects. There is no chemical change involved before, after, or during.

The attraction of certain materials to a magnet is a physical property of matter because it doesn't involve a change in the chemical composition of the material but rather relates to the arrangement and behavior of its electrons.

The attraction of certain types of matter to a magnet is a physical property of matter. Physical properties are characteristics of a substance that can be observed or measured without altering the substance's chemical composition. Magnetism is one such property that describes a material's ability to be attracted to or repelled by a magnet.

The phenomenon of magnetism arises from the alignment and behavior of the electrons in the atoms or molecules of a material. Materials that exhibit magnetic properties have domains where the magnetic moments of the individual atoms or molecules align in a particular direction. When exposed to an external magnetic field, these domains can align with the field, causing the material to be attracted to the magnet.

Importantly, this attraction is reversible and does not involve a change in the material's fundamental chemical composition. When the magnetic field is removed, the material returns to its original state. Common magnetic materials, such as iron, nickel, and cobalt, have unpaired electrons in their electron configurations, which allows them to exhibit strong magnetic properties.

In contrast, chemical properties of matter involve changes in the chemical composition of substances, such as reactions that form new compounds or alter the arrangement of atoms within molecules.

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Answer:

A. 170.24 dm³

B. 9.9 dm³

C. 80.6 dm³

Explanation:

Data Given:

no. of moles of Ar = 7.6 mol

no. of moles of C₂H₆ = 0.44 mol

no. of moles of NH₃ = 3.6 mol

Volume of each gas at STP = ?

Solution:

To calculate volume of gas at STP (Standard temperature and pressure) formula will be used

             no. of moles = volume of gas / molar Volume

Rearrange the above equation:

              Volume of gas = no. of moles x molar Volume . . . . . . (1)

where

molar volume at STP = 22.4 dm³/mol

• A. Now to calculate Volume for 7.6 mole Ar

Put value in equation 1

Volume of Ar = 7.6 mol x 22.4 dm³/mol

Volume of Ar = 170.24 dm³

___________

• B. Now to calculate Volume for 0.44 mole C₂H₆

Put value in equation 1

Volume of C₂H₆ = 0.44 mol x 22.4 dm³/mol

Volume of C₂H₆ = 9.9 dm³

___________

• C. Now to calculate Volume for 3.6 mole NH₃

Put value in equation 1

Volume of NH₃ = 3.6 mol x 22.4 dm³/mol

Volume of NH₃ = 80.6 dm³

The volume of the gases at Standard Temperature and Pressure (STP) can be calculated using Avogadro's law. For 7.6 mol of Ar, the volume is 170.24 L. For 0.44 mol of C2H6, the volume is 9.856 L and for 3.6 mol of NH3, the volume is 80.64 L.

To calculate the volume of a gas at Standard Temperature and Pressure (STP), you can use Avogadro's law which states that one mole of any gas will occupy a volume of 22.4 liters.

The calculated volumes of the gases are:

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Answer:

I₂ + H₂O --------→ HI + HIO

Explanation:

Iodine is not fully dissolve in water but only dissolve up to some extent.

When iodine was mixed with water it give mixture of two products.

So the balance reaction is as under

        I₂ + H₂O --------→ HI + HIO

All the reactant are one mole and one one mole of each product produced in the shown reaction.

This is a reversible reaction and only 0.05% of Iodine molecule react with water and the other  Iodine molecule remain in water unreacted.

Answer: false

Explanation: metal like sodium, potassium have just one oxidation number while metals like aluminium have 3

Answer:

7.5 m/s²

Explanation:

Given data:

Force on object = 418 N

Mass of object = 56 kg

Acceleration rate = ?

Solution:

Definition:

The acceleration is rate of change of velocity of an object with respect to time.

Formula:

a = Δv/Δt

a = acceleration

Δv = change in velocity

Δt = change in time

Units:

The unit of acceleration is m.s⁻².

Acceleration can also be determine through following formula,

F = m × a

a = F/m

Now we will put the values.

a = 418 N/ 56 kg

N = Kg. m /s²

a = 418 Kg. m /s²/ 56 kg

a = 7.5 m/s²

Answer:

Explanation:

Balanced Chemical equation:

HClO₂(aq) + NaOH(aq) → H₂O(l) + NaClO₂ (aq)

Ionic equation:

H⁺(aq) + ClO₂⁻(aq) + Na⁺(aq) + OH⁻(aq) → H₂O(l) + Na⁺(aq) + ClO₂⁻ (aq)

Net ionic equation:

H⁺(aq) + OH⁻(aq) → H₂O(l)  

The ClO₂⁻(aq) and Na⁺ (aq) are spectator ions that's why these are not written in net ionic equation. The water can not be splitted into ions because it is present in liquid form.

Spectator ions:

These ions are same in both side of chemical reaction. These ions are cancel out. Their presence can not effect the equilibrium of reaction that's why these ions are omitted in net ionic equation.  

Chemical equation:

NaCl(aq) + KBr(aq)  → NaBr(aq) + KCl(aq)

Ionic equation:

Na⁺(aq)  + Cl⁻(aq) + K⁺(aq)  + Br⁻(aq)  → Na⁺(aq) + Br⁻(aq) + K⁺(aq)  + Cl⁻(aq)

Net ionic equation can not be written for this reaction because nothing is changed on both side. There is no solid, liquid and gaseous product. All are aqueous and cancel each other.

Answer:s the solution expressed in the unit %. ... Solvent is a liquid which dissolves the solute.

Explanation:

Volume/volume percentage (v/v percent) is a measure of the concentration of a substance in a solution. It is expressed as the ratio of the volume of the solute to the total volume of the solution multiplied by 100. Examples: Wine has a typical alcohol content (v/v percent) of 12 percent.

Answer:

See the answer below, please.

Explanation:

The volume / volume percentage relates the volume of solute / solution volume and this is multiplied by 100.

In the case of weight / volume percentage, relate grams of solutes to milliliters of solution, then this is multiplied by 100.

Final answer:

To calculate the mass of glucose produced from 3.00 moles of carbon dioxide in the photosynthesis reaction, use the mole ratio from the balanced equation and the molar mass of glucose (180.16 g/mol), which results in 90.08 grams of glucose.

Explanation:

The reaction 6CO₂(g) + 6H₂O(l) → C₆H1₁₂O₆(s) + 6O₂(g) represents the photosynthesis process where carbon dioxide and water produce glucose and oxygen. To find out the mass of glucose produced from 3.00 moles of carbon dioxide, we can use the mole ratio from the balanced chemical equation and the molar mass of glucose.

The balanced equation tells us that 6 moles of CO₂ produce 1 mole of glucose (C₆H₁₂O₆). Therefore, 3.00 moles of CO2 will produce half as much glucose, which is 0.5 moles of glucose. By using the molar mass of glucose, we can convert moles to grams.

For glucose, the molar mass is 180.16 g/mol. So,

Answer:

1.524 is 5ft to meters

Explanation:

Answer:

Among Na ,K , Pb , Li , The atom which does not react with water is :

Pb

Explanation:

Li  : Reacts slowly with water

Na ,K  : Reacts vigorously with water

Pb : It does not reacts with water because :- Pb oxidize in presence of  atmospheric oxygen to form lead oxide (PbO) . this PbO form a layer over the surface of Pb and make it inert to water.

Answer:

B

Explanation:

From the given formukar for energy of a photon, we can obtain the energy of the photon as shown in the image. The meaning of the parameters in the equation are also shown in the image.

Answer: 2.21 x 10^-18 j

Explanation: a pex

Answer:

Phosphorus

Explanation:

As we move from left to right across the periodic table the number of valance electrons in an atom increase. The atomic size tend to decrease in same period of periodic table because the electrons are added with in the same shell. When the electron are added, at the same time protons are also added in the nucleus. The positive charge is going to increase and this charge is greater in effect than the charge of electrons. This effect lead to the greater nuclear attraction and electronegativity increases.

As we move down the group atomic radii increased with increase of atomic number. The addition of electron in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus electronegativity decreases.

Silicon is present in group 4A and Phosphorus and Arsenic is present in group 5A thus electronegativity of silicon is less than Phosphorus and arsenic. Arsenic is present down to phosphorus thus its electronegativity will less than phosphorus.

P = 2.19

Si = 1.9

As = 2.18

Answer:

A is Sediments

B  is metamorphic rock

C is sedimentary rocks

D is weathering

Explanation:

A represent smaller particles of rocks known as sediments. From the picture above sedimentary rocks, igneous rocks and metamorphic rocks were broken into smaller constituent due to events like weathering(D). Weathering disintegrated these rocks into smaller particles (sediments).

B is rock known as metamorphic rocks. Metamorphic rocks are formed from igneous, sedimentary or even metamorphic rocks. The major factor behind metamorphic rocks formation is temperature and pressure. Generally, the parents rocks never melts, the transformation usually occur in a solid state. Metamorphism is a process that is usually accompanied with change in mineral assemblage , physical attribute of the rocks or both. From the picture above the sedimentary rocks(C) was converted to metamorphic rocks due to temperature and pressure . Same occurrence was present in the conversion of igneous rocks to metamorphic rocks(B)

C is a sedimentary rocks. Sedimentary rocks are formed from smaller particles of the weathered rocks.  The smaller particles are known as sediments. This sediments are then cemented and compacted by cementing agents to form sedimentary rocks.

D is a process, which is known as weathering. Weathering is the disintegration of rocks into smaller particles to form sediments . Weathering may involve change in the chemical composition of rocks or  just a physical change . From the picture above igneous rocks, metamorphic rock and sedimentary rocks were weathered to form sediments(A).

Answer:

Explanation: i got 100% on edge.

Answer:

They require only one electron to complete their outer shell

Explanation:

The elements of group 17 are called halogens. These are six elements Fluorine, Chlorine, Bromine, Iodine, Astatine. Halogens are very reactive these elements can not be found free in nature. Their high reactivity is due to the presence of seven valance electrons. They need just one electron to complete the octet that's why they can not found free in nature. Their chemical properties are resemble greatly with each other. As we move down the group in periodic table size of halogens increases that's way fluorine is smaller in size as compared to other halogens elements. Their boiling points also increases down the group which changes their physical states. i.e fluorine is gas while iodine is solid.

Consider the example of sodium chloride. Chlorine accept one electron from sodium and complete the octet.

The electronegativity of chlorine is 3.16 and for sodium is 0.93. There is large difference is present. That's why electron from sodium is transfer to the chlorine. Sodium becomes positive and chlorine becomes negative ion. Both atoms are bonded together electrostatic attraction occur between them and both get complete complete octet.

Answer:

1) have a high electronegativity

and

2) require only one electron to complete their outer shell

Explanation:

Answer:

Halogen group (group 17)

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