no.of elements in KMnO4​

Answer:

An Atom

Explanation:

An atom is the smallest unit of matter

Answer:

SOURCES OF GAMMA RAYS

Explanation:

They are produced by the hottest and most energetic objects in the universe, such as neutron stars and pulsars, supernova explosions, and regions around black holes.

Hope This Helps * I Used My Science Book To Answer This

Answer:

\(P_{N_2}=285 torr\)

Explanation:

Given that

Volume of cylinder = 3 L

Temperature= 25 degrees

Partial pressure of the gases

\(P_{He}=115 torr\)

\(P_{N_2}=285 torr\)

\(P_{Ar}=325 torr\)

By using Dalton's law , the total pressure of the non reacting gas is the sum of the partial pressure of all gases.

\(P_{total}=P_{He}+P_{N_2}+P_{Ar}\)

\(P_{total}=115+285+325=725 torr\)

When all the He gas will removed then partial pressure of He will be zero.

\(P_{total}=P_P_{N_2}+P_{Ar}\)

\(P_{total}=285+325=610 torr\)

Partial pressure of N₂

\(P_{N_2}=610-325=285 torr\)

\(P_{N_2}=285 torr\)

In the blast furnace production of iron metal from iron ore 45 moles of O₂ will be required for the production of 3.36 kg of iron metal.

In the blast furnace production of iron metal from iron ore (Fe₂O₃), the two important reactions are:
1. Fe₂O₃ + 3CO → 2Fe + 3CO₂
2. Fe₂O₃ + 3C → 2Fe + 3CO
To determine how many moles of O2 are required for the production of 3.36 kg of iron metal, follow these steps:
1-Convert the mass of Fe to moles.
1 mole of Fe has a mass of approximately 56 g (using the atomic weight of iron).

Therefore, 3.36 kg = 3360 g
moles of Fe = 3360 g / 56 g/mol = 60 moles

2-Use the stoichiometry of the reactions to find moles of Fe₂O₃.
From the balanced reactions, 2 moles of Fe are produced from 1 mole of Fe₂O₃.

Therefore, moles of Fe₂O₃ = 60 moles Fe / 2 = 30 moles

3-Determine the moles of O₂ required.
1 mole of Fe₂O₃ contains 3 moles of O atoms.

Since O₂ is diatomic, 1 mole of O₂ contains 2 moles of O atoms.

Therefore, moles of O atoms in Fe₂O₃ = 30 moles

Fe2O3 * 3 = 90 moles

moles of O₂ required = 90 moles O / 2 = 45 moles O₂

In conclusion, 45 moles of O₂ are required for the production of 3.36 kg of iron metal.

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D. The empty glassware might heat quickly, igniting vapors from the distillation. Without any liquid within, a distillation flask can overheat and cause the glass to heat up quickly.

There are serious safety risks associated with overheating a distillation flask until it is dry. The leftover substance within the flask might ignite and perhaps cause an explosion when the glassware rapidly heats up. In addition, heating may result in the creation of gases inside the flask, which may then catch fire. To prevent such risky circumstances, it's crucial to carefully check that there is liquid in the distillation flask before adding heat. To reduce the possibility of accidents or injuries, it's also crucial to use caution when handling glassware and to adhere to the proper safety procedures.

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Answer:

The answer is (c) Zn(No3)2

Explanation:

Because we know the cation of zinc is+2 and whereas nitrate is anion, -1.

Question 24:

Answer C : Q is placed in group 13 and period 2.

Question 25:

Answer C : II and IV.

Question 26:

Answer D

The dominant transport mechanism in the lake is diffusion. The water treatment plant has a limited time before it needs to start treating for manganese, and the minimum height above the lake bottom for the water intake to provide one year for designing and installing a manganese treatment system needs to be determined.

Dominant transport mechanism: Diffusion is the main transport mechanism in the lake. This means that manganese is gradually diffusing from the solid deposits at the lake bottom into the water column.

 t = (L^2) / (4D)

where t is the time in seconds, L is the distance from the bottom (1 ft or 30.48 cm), and D is the diffusion coefficient of manganese (6.88×10^(-6) cm^2/s).

Calculation Plugging in the values into the equation, we can calculate the time it takes for manganese to reach the water intake level.

  t = (30.48^2) / (4 × 6.88×10^(-6)) = 126,707 seconds

  Converting seconds to days: 126,707 seconds ÷ (24 hours/day × 3600 seconds/hour) ≈ 1.47 days

  Therefore, the water treatment plant has approximately 1.47 days before it needs to start treating for manganese.

Minimum intake height: To provide one year for designing and installing a manganese treatment system, the intake should be raised to a height where the time it takes for manganese to reach that level is one year.

  t = (L^2) / (4D)

  Rearranging the equation to solve for L:

  L = √(4Dt)

  Plugging in the values: L = √(4 × 6.88×10^(-6) cm^2/s × (1 year × 365 days/year × 24 hours/day × 3600 seconds/hour))

  L ≈ 49.65 cm or 0.163 ft

The minimum height above the lake bottom that the intake should be raised to is approximately 0.163 ft.

The dominant transport mechanism in the lake is diffusion, where manganese is slowly diffusing from the solid deposits into the water column. The water treatment plant has approximately 1.47 days before it needs to start treating for manganese to maintain concentrations below the detection limit. To provide one year for designing and installing a treatment system, the intake should be raised to a minimum height of approximately 0.163 ft above the lake bottom.

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Answer:

480 million years old

Explanation:

The answer is (e) 60, 160: there are 60 moles of copper ions and 160 moles of oxygen atoms in 20 moles of copper (II) phosphate.

The formula for copper(II) phosphate is Cu3(PO4)2.

To find the number of moles of copper ions in 20 moles of copper (II) phosphate, we must first find the number of moles of copper in one mole of copper (II) phosphate.

We have 3 moles of copper in one mole of copper (II) phosphate.

Therefore, we have:3 x 20 = 60 moles of copper ions

To find the number of moles of oxygen atoms in 20 moles of copper (II) phosphate, we first need to find the total number of oxygen atoms in 20 moles of copper (II) phosphate.

In one mole of copper (II) phosphate, there are 8 oxygen atoms (2 from each phosphate ion).

We have:8 x 20 = 160 oxygen atoms.

So, the answer is (e) 60, 160: there are 60 moles of copper ions and 160 moles of oxygen atoms in 20 moles of copper (II) phosphate.

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Explanation:

When the water evaporates from your clothes, it will "hang around" around it. If there is little or no air movement, this means that the air surrounding the fabric is saturated with moisture, which means it will not evaporate more. The breeze will move the moisture-saturated air away from the fabric, until more water evaporates.

Answer:

20g/cm³

Explanation:

density= mass÷volume

m= 60g÷3cm³

= 20g/cm³

Answer:

c: The equilibrium position will shift away from what was added to lower its concentration.

Explanation:

Answer: C. The equilibrium position will shift away from what was added to lower its concentration.

Explanation:

If we have a system that is already in equilibrium, the addition of an extra amount of one of the reactants or one of the products throws the system out of equilibrium. Either the forward or the reverse reaction will then occur to restore equilibrium conditions.

The mass, in grams, of H₂O is produced in the decomposition of ammonium nitrate is 72.06 grams.

Mass of any substance will be calculated by using their moles as:

n = W/M, where

W = required mass

M = molar mass

Given chemical reaction is:

NH₄NO₃ → N₂O + 2H₂O

Moles of 160.1 g of NH₄NO₃ = 160.1g / 80.03g/mol = 2moles

From the stoichiometry of the reaction, it is clear that:

1 moles of NH₄NO₃ = produce 2 moles of H₂O

2 moles of NH₄NO₃ = produce 2×2=4 moles of H₂O

Mass of H₂O will be calculated as:

W = (4mol)(18.01 g/mol) = 72.04 grams (72.06 approx)

Hence, option (4) is correct.

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The nuclear disintegration series of 238-U is the source of radon-222 in soil.

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The temperature at which the reaction would go twice as fast is 67.2°C when the activation energy of a certain reaction is 48.4 kJ/mol kJ/mol.

The rate constant of a reaction is related to its activation energy through the Arrhenius equation, which states that k = \(Ae^{(-Ea/RT)}\), where k is the rate constant, Ea is the activation energy, R is the gas constant, and T is the temperature in Kelvin.
To find the temperature at which the reaction would go twice as fast, we can use the fact that the rate constant is proportional to the reaction rate, so if we want the reaction to go twice as fast, we need to double the rate constant.
Using the Arrhenius equation, we can write:
\(k1 = Ae^{(-Ea/RT1)}\)
\(k2 = Ae^{(-Ea/RT2)}\)
where k1 is the rate constant at 26°C, k2 is the rate constant at the unknown temperature, T1 is 26°C converted to Kelvin (299 K), and T2 is the unknown temperature converted to Kelvin.
We know that we want k2 to be twice k1, so:
2k1 = k2
\(2Ae^{(-Ea/RT1)} = Ae^{(-Ea/RT2)}\)
Simplifying:
\(2 = e^{(Ea/R * (1/T2 - 1/T1))}\)
Taking the natural logarithm of both sides: \(k2 = Ae^{(-Ea/RT2)}\)
ln(2) = Ea/R * (1/T2 - 1/T1)
Rearranging:
T2 = 1/(1/T1 + (R/Ea)*ln(2))
Plugging in the values we have:
T2 = 1/(1/299 + (8.314/48.4)*ln(2))
T2 = 340.3 K
Converting back to Celsius:
T2 = 67.2°C

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If the radio waves from earth reach moon within 1.33 s in a speed of light then, the distance of moon from earth will be 3.9 ×10⁸ m.

Radio waves are electromagnetic waves with highest wavelength and lesser energy. The speed of these waves will be equal to the light speed that is, 3 ×10⁸ m/s.

Distance is the product of time and velocity. It is given that the time taken by the radio wave to reach moon from earth is 1.33 seconds and the velocity of wave is 3 ×10⁸ m/s thus, distance to moon is calculated as follows:

Distance = Time × velocity

               = 1.33 s × 3 ×10⁸ m/s

               = 3.9 ×10⁸ m

Hence, moon is 3.9 ×10⁸ m away from earth.

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The given statement is true. Scientists who use logic to determine whether or not a drug is safe. These researchers are using the classical model of decision making.

A logical and methodical approach to decision-making is the classical model of decision-making. This model proposes that decision-makers gather all relevant data, thoroughly evaluate the alternatives, then select the alternative that maximises their utility or produces the desired result. This model makes the supposition that decision-makers have full knowledge of all available options, are unbiased and logical in their assessment, and make choices free from prejudice or emotional influence. It employs a sequential procedure that involves recognising the issue, specifying the decision criteria, allocating weight to each, producing alternatives, assessing the alternatives, and selecting the best option.

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Answer:

Figure  7.4.1 : Balancing Equations. You cannot change subscripts in a chemical formula to balance a chemical equation; you can change only the coefficients. Changing subscripts changes the ratios of atoms in the molecule and the resulting chemical properties. For example, water (H2O) and hydrogen peroxide (H2O2) are chemically distinct substances. H2O2 decomposes to H2O and O2 gas when it comes in contact with the metal platinum, whereas no such reaction occurs between water and platinum. The subscripts are part of the formulas and once the formulas for the reactants and products are determined, the subscripts may not be changed. The coefficients indicate the number of each substance involved in the reaction and may be changed in order to balance the equation. The equation above indicates that one mole of solid copper is reacting with two moles of aqueous silver nitrate to produce one mole of aqueous copper (II) nitrate and two atoms of solid silver.

Explanation:

Answer: 6

Explanation:

Element                Quantity

Copper                        1

Silver                           2

Nitrogen                      1

Oxygen                        6

Answer:

Yeah what he said about the questions

Boiling water on a stove is an example of thermal energy. Thermal energy is produced when the atoms and molecules in a substance vibrate faster due to a rise in temperature.

Answer:

It won't be good.

Explanation:

In the core of the sun, hydrogen is produced by nuclear fusion. when the sun ages, it starts to run out of the hydrogen. when it runs out, nuclear fusion can't generate heat, and then the sun expands, becoming a red giant.

Answer:

Aargon is NOT the answer.

Explanation:

Answer:

1200 J/K  

Explanation:

The formula for the entropy associated with a reversible phase change is

\(\Delta S= \dfrac{q_{\text{rev}}}{T}\)

For a reversible phase change like melting,

\(q_{\text{rev}} = m\Delta_{\text{fus}}H\)

Data:

Mass of ice = 1.0 kg

T = 0 °C

Calculations

1. Convert the mass of ice to grams

\(\text{Mass of ice} = \text{1.0 kg } \times \dfrac{\text{1000 g}}{\text{1 kg}} = \text{1000 g}\)

2. Convert the temperature to kelvins

T = (0 + 273.15) K = 273.15 K

3. Calculate the heat needed to melt the ice

\(q_{\text{rev}} = m\Delta_{\text{fus}}H = \text{1000 g} \times \dfrac{\text{334 J}}{\text{1 g}} = \text{334 000 J}\)

4. Calculate the entropy change

\(\Delta S = \dfrac{q_{\text{rev}}}{T} = \dfrac{\text{334 000 J}}{\text{273.15 K}} = \textbf{1200 J/K}\)

According to the aforementioned assertion, water has the highest level of cohesiveness among non-metallic liquids.

(1) A molecules is the smallest constituent of a chemical compound and element that possesses the elemental composition of that constituent or element. Chemical bonds are used to connect molecules to create molecules. Two different categories of molecules exist: 2. The molecules of an element The molecules that make up an element.

Atoms come together to form molecules. These three atoms that make up a molecule of water are two oxygen (O) atoms, one hydro (H) molecule, and another. As a result, water is sometimes abbreviated as H2O. A single drop of liquid contains billions of water molecules in reality.

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Answer:

It is neither a synthesis reaction nor a decomposition reaction because two reactants form two products.

Explanation:

This reaction would be considered a single replacement reaction.

The chemical reaction involves the products and the reactants. The image is neither synthesis nor decomposition as the two products are formed from two reactants. Thus, option A is correct.

A chemical reaction includes the chemical interaction between the reactants to yield the products. In a synthesis reaction, two reactants interact to produce a different molecule or compound.

In a decomposition reaction, a reactant undergoes splitting to produce products and energy. But in the image two reactants produces two products that neither of the reaction shows.

This type of reaction is seen as the single replacement reaction where the more reactive element displaces the less reactive from the compound to form the new molecule.

Therefore, option a. Maya's picture represents a single replacement reaction but not a synthesis or decomposition reaction.

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Answer:

B. \( 5 \times {10}^{ - 5}\: m \)

Explanation:

\(0.00005 \: m= 5 \times {10}^{ - 5} \: m \\ \)

Dates are collected carefully and with a lot of laborious work, much as how they are cultivated. After adding water and filtering the homogenized result with a cellulose filter aid, date fruits are removed using a wet grinding process.

The polysaccharide cellulose, an organic molecule with the formula n, is made up of a linear chain of several hundred to many thousands of D-glucose units that are covalently bonded.

Plant cell walls include the carbohydrate cellulose. The structure of the carbohydrate is polysaccharide. A lengthy chain of many sugar units joined by chemical bonding makes up a polysaccharide. Examples of polysaccharides include starch, chitin, glycogen, cellulose, and glycogen.

Use of a reach lift varies greatly depending on the size of the trees. This lift carries an employee up the trees to gather the date bunches. The filtering aid might be date pits. Before filtering, a fermentation may be performed.

Thus, Dates are collected carefully and with a lot of laborious work, much as how they are cultivated.

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Answer:

Plant breeding

Plant breeding is the science of changing the traits of plants in order to produce desired characteristics. It has been used to improve the quality of nutrition in products for humans and animals.

Explanation: