Calculate how many grams of BeCl2 are required to produce 0.52 grams of MnCl2

The statement is correct. The photoelectric effect refers to the phenomenon where electrons are ejected from the surface of a material when it is exposed to light. The frequency of light striking an electron in a metal must be above the threshold frequency in order for the photoelectric effect to occur.

The statement is correct. The photoelectric effect refers to the phenomenon where electrons are ejected from the surface of a material when it is exposed to light. However, for the photoelectric effect to occur, the frequency of the incident light must be above a certain threshold frequency.

The threshold frequency is the minimum frequency of light required to dislodge electrons from the material. Below this threshold frequency, regardless of the intensity or duration of the light, no electrons will be emitted.

This behavior can be explained by the particle-like nature of light, where light is composed of discrete packets of energy called photons. The energy of a photon is directly proportional to its frequency. Only photons with energy greater than or equal to the binding energy of the electrons in the material can dislodge them.

Therefore, the frequency of light striking an electron in a metal must be above the threshold frequency in order for the photoelectric effect to occur.

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The proximity of unsaturated groups (C=C, C=O, aromatic) and electronegative atoms (O, N, halogen) has an impact on the proton NMR chemical shift. Electronegative groups shift to the left (down field; ppm rise).

The chemical shift in nuclear magnetic resonance (NMR) spectroscopy refers to the atomic nucleus' resonant frequency in relation to a standard in a magnetic field. The location and quantity of chemical changes frequently serve as diagnostic indicators of molecular structure.

You take into account the chemically non-equivalent proton(s) one at a time while making chemical shift predictions. Find the origin of each proton or proton pair that is not chemically comparable. Whether the proton(s) is/are linked to a methyl, methene, or methine determines the beginning point.

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The growth of the new plant depicts the asexual reproduction characteristic. The characteristic that describes the growth of the new plant in Stephan's mother cutting a twig from a rose bush and planting it in the soil is asexual reproduction.

Asexual reproduction is the mode of reproduction by which organisms generate offspring that are identical to the parent's without the fusion of gametes. Asexual reproduction is a type of reproduction in which the offspring is produced from a single parent.

The offspring created are clones of the parent plant, meaning they are identical to the parent.The new plant in Stephan’s mother cutting a twig from a rose bush and planting it in the soil depicts the process of asexual reproduction, which is the ability of a plant to reproduce without seeds. In asexual reproduction, plants can reproduce vegetatively by cloning themselves using their roots, bulbs, or stems.

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Answer:

\(0.8\overline 3\) moles of A and 2.5 moles of B in the one-phase system

\(1.1 \overline 6\) moles of A and \(0.1458 \overline 3\) moles of B in the two-phase system

\(0.3541 \overline 6\) moles of B remains in the system

Explanation:

The given parameters are;

The extent of miscibility of liquid B and C = Partially miscible

The number of moles of liquid B added to 1 mole of liquid A that forms a two-phase system = 0.125 mol of liquid B

The number of moles of liquid B added to 1 mole of liquid A that forms a one -phase system = 3 moles of liquid B

Whereby the system consist of 2.5 mol of B and 2 mol of C at 25°C, we have;

The 1 mole of A mixes with 3 moles of B to form a single phase solution

Therefore;

2.5 moles of B will mix with (1/3)×2.5 moles of A = 5/6 moles of A

The remaining number of moles of A in the system = 2 - 5/6 =  7/6 moles of A

Similarly, we have;

At least, 0.125 mole of B combines with 1 mole of A to form a two-phase system

7/6 moles of A will combine with 7/6 × 0.125 = 7/48 moles of B to form a two-phase system

The number of moles of B left = 0.5 - 7/48 = 17/48 = 0.3541\(\overline 6\) moles of A

Therefore, we have;

5/6 moles of A and 2.5 moles of B in the one-phase system

7/6 moles of A and 7/48 moles of B in the two-phase system

17/48 moles of B remaining in the system

Answer:

a) 6.3 cm

b) 8.0 cm

c) 0.7875

Explanation:

(a) The compound has moved above upto 7.3 cm from the bottom of the paper. Let us assume that line is drawn at 1.0 cm mark as the origin of spot. \

Distance traversed by compound= 7.3 - 1.0 cm = 6.3 cm

(b) Distance traversed by the solvent = 9.0 - 1.0 cm = 8.0 cm

(c) The Rf = Compound Migration distance / Solvent front migration distance

                      = 6.3/8.0 = 0.7875

Viscosity, conductivity, and density are all physical properties that can be affected by solute concentration, but vapor pressure will not distinguish the two solutions from each other.

Vapor pressure is the pressure exerted by a vapor in equilibrium with its liquid or solid form. The vapor pressure of a solution depends on the vapor pressure of the pure solvent and the mole fraction of the solute. If two solutions have the same solute concentration, they will have the same mole fraction of solute and the same vapor pressure, even if they contain different salts.

Therefore, vapor pressure will not distinguish the two solutions from each other. However, viscosity, conductivity, and density can all be used to distinguish the two solutions. The viscosity of a solution depends on the size and shape of the solute molecules and their interactions with the solvent molecules. The conductivity of a solution depends on the presence of ions and their mobility. The density of a solution depends on the mass and volume of the solute and solvent. By measuring these properties, a chemist can determine the properties of the solute and determine if the two solutions are different.

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The simplified expression for the given expression is:40T^2 × T^98 × (4^181) / 4^67

Given expression : (4^-3)^-3 × (4^0)^-9 × (4^6)^-3 × (-4)^-49 × (2T)^2 × (T^2)^49 × (-4)^181 × 40To simplify the given expression, we use the following properties of exponents : For any real numbers a, b and n, we have ;a^-n = 1/a^n and a^n × a^m = a^(n+m)Let's simplify each term of the given expression one by one:(4^-3)^-3 = 4^(9) because when a negative exponent is raised to another negative exponent, it becomes positive. (4^-3)^-3 = 4^(-3×-3) = 4^(9)(4^0)^-9 = 4^0 = 1 because any number raised to the power of 0 is equal to 1(4^6)^-3 = 4^(-6×3) = 4^(-18) because when a negative exponent is multiplied by another negative exponent, it becomes positive.(-4)^-49 = -1/(4^49) because when a negative exponent is raised to another negative exponent, it becomes positive and also negative.(-4)^181 = (4^181) because when an odd negative power of a negative number is raised to another power, it becomes negative.40 = 40 as it is(2T)^2 = 4T^2(T^2)^49 = T^(2×49) = T^98(-49) = -49 as it is Now let's simplify the given expression:1 × 1/(4^49) × 4^(-18) × 40 × 4T^2 × T^98 × (4^181)40 and 4^-18 can be simplified and combined as follows:1/(4^49) × 4^(-18) × 40 = 40/(4^49 × 4^18) = 40/4^(49+18) = 40/4^67.

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Answer:

λ = 1.1×10⁸ m

Explanation:

Given data:

Frequency of wave = 2.7 Hz

Wavelength of wave = ?

Solution:

Formula:

Speed of wave = frequency × wavelength

Speed of wave = 3×10⁸ m/s

now we will put the values in formula.

3×10⁸ m/s = 2.7 s⁻¹ × λ

λ = 3×10⁸ m/s /2.7 s⁻¹

λ = 1.1×10⁸ m

Answer:a

Explanation:

There are several units for distance, but the most commonly used unit in the International System of Units (SI) is the meter (m). The meter is defined as the distance traveled by light in a vacuum during a time interval of 1/299,792,458 of a second.

What is Distance?

Distance is a measure of the amount of space between two points. It is the length of the path taken by an object or person moving from one point to another, regardless of the direction taken. Distance is a scalar quantity, meaning it has magnitude but not direction.

Distance can be measured using a variety of units, such as meters, kilometers, miles, or feet, depending on the context and the scale of the distance being measured. For example, we might measure the distance between two cities in kilometers, the distance between two buildings in meters, or the distance between two points on a map in miles.

Other units for distance include:

Kilometer (km): 1,000 meters

Centimeter (cm): 1/100th of a meter

Millimeter (mm): 1/1,000th of a meter

Micrometer (µm): 1/1,000,000th of a meter

Nanometer (nm): 1/1,000,000,000th of a meter

There are also larger units for distance, such as the astronomical unit (AU) which is used to measure distances within the solar system.

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The type of movement that occurs in the plate movement listed above include the following:

These are gigantic pieces of the Earth's crust and uppermost mantle and are made up of oceanic crust and continental crust.

A convergent boundary as the name implies occurs when lithospheric plates are moving towards one another.

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The correct option is (d) i.e. I and III. I In any energy conversion, some of the usable energy is always lost and III Systems will go spontaneously in one direction only, toward increasing entropy follow second law of thermodynamics.

Entropy is a scientific concept and measurable physical feature that is frequently related to a state of chaos, unpredictability, or uncertainty. The phrase and concept are used in a range of fields, from classical thermodynamics, where it was first discovered, to the principles of information theory, to the microscopic description of nature in statistical physics. In physics and chemistry, biological systems and how they connect to life, cosmology, economics, sociology, weather science, and information systems, particularly the interchange of information, it has a wide range of applications. Entropy has the consequence of rendering some operations impossible or irreversible, in addition to the need that they do not conflict with the first law of thermodynamics, which is the conservation of energy. Based on the idea of entropy, the second law of thermodynamics states that isolated systems permitted to develop naturally cannot have their entropy decrease over time because they always reach a state of thermodynamic equilibrium where it is highest.

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Answer:

1600j

Explanation:

PE = mass * gravitational acceleration * hight

PE = 20 * 10 * 8

PE = 1600 joules

Answer:The name of the compound is sodium fluoride with formula NaF.

Explanation: Sodium is a group 1 element with atomic number 1. It has 11 electrons. It is soft reactive metal. It has 1 valence electron.

Fluorine is a group 7 element, a hologen with 7 valence electron. It is a most reactive non metal.

When sodium react with fluorine, ionic bond is formed in the resulting compound sodium fluoride.

One sodium and fluorine each totaling 2 atoms are enough to make the bond.

As the bond is formed, both atoms have octet structure. That is they each have 8 electrons on their outermost shells.

The positive charge on sodium indicates that sodium had lost 1 electron to fluorine atom.

The negative charge on fluorine ion indicates that fluorine atom had gained 1 electron from sodium atom to form negative ion.

The name of the compound is sodium fluoride with formula NaF.

Ionic bonds are most likely to occur when the number of valence electrons is close to shared electron numbers.

The valance electrons are those types of electrons that are present in the balanced shell or valence orbital of an atom and only this take part in the bond formation with others.

The formation of an ionic bond can be possible when the valance electrons have the same number of electrons to share so that electrons will shift toward the positive atom.

Therefore, Ionic bonds are most likely to occur when the number of valence electrons is close to shared electron numbers.

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Answer:

The amount H2O produced is also halved

Explanation:

A strong acid as HCl reacts with a strong base as NaOH producing water and a salt, NaCl. The reaction is:

HCl + NaOH → NaCl + H₂O

Where 1 mole of HCl reacts per mole of NaOH to produce 1 mole of water.

That means, if the amount of HCl and NaOH is halved, the amount H2O produced is also halved because 1 mole of each reactant produce 1 mole of water

Answer:

-133.2 kJ

Explanation:

Let's consider the following balanced equation.

4 KClO₃(s) → 3 KClO₄(s) + KCl(s)

We can calculate the standard Gibbs free energy of the reaction (ΔG°rxn) using the following expression.

ΔG°rxn = 3 mol × ΔG°f(KClO₄(s)) + 1 mol × ΔG°f(KCl(s)) - 4 mol × ΔG°f(KClO₃(s))

ΔG°rxn = 3 mol × (-303.1 kJ/mol) + 1 mol × (-409.1 kJ/mol) - 4 mol × (-296.3 kJ/mol)

ΔG°rxn = -133.2 kJ

Answer:

HNNH has both the strongest nitrogen-nitrogen bond and the shorter nitrogen-nitrogen bond.

Explanation:

HNNH has the strongest and shorter nitrogen-nitrogen bond.

We know in chemistry that the shorter a bond is, the stronger is. Also, a triple bond is shorter than a double bond and a double bond is shorter than a single bond.

Having said that, we know that HNNH contains a nitrogen - nitrogen triple bond while H2NNH2 contains a nitrogen - nitrogen single bond.

Since a triple bond is shorter and stronger than a single bond,  HNNH has the strongest and shorter nitrogen-nitrogen bond.

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Answer:

The correct answer is: Sweden

I just submitted my test with this question on it and it said the right answer was Sweden. When you look at the graphs the one with the most dark blue has the most supporters. Sweden has the most dark blue.

Hope this is helpful, please mark me Brainliest if i got it right :)

Explanation:

Answer: While the South Pole lies on a continental land mass, the North Pole is located in the middle of the Arctic Ocean amid waters that are almost permanently covered with constantly shifting sea ice.

Explanation: Covers the north and south poles of the earth 2 words

Answer:

Explanation:

Isomers are compounds with the same molecular formula but chemically distinctive structures. Compounds that vary in connectivity, or how the component atoms are related to one another, are known as constitutional isomers. They have distinct functional groups and bonding patterns according to the sequence in which the atoms are linked together.

From the information given:

The compound given is C₃H₆Br₂ and the constitutional isomer of the compound can be seen in the image attached below.

The formal charges are calculated as follows:

Formal charge = valence electron - 1/2(bonding electron) - lone electron

For Br:

Formal charge = 7 - 1/2(2) - 6

Formal charge = 7 - 1 - 6 = 0

For C:

Formal charge = 4 - 1/2(8) - 0

Formal charge = 4 - 4 = 0

For H:

Formal charge = 1 - 1/2(2)

Formal charge = 1 - 1 = 0

Answer:

(A) It matches the universal pH indicator and is indicating the proper pH.

Explanation:

Correct on edge 2021

Given the data from the question, the correct statement is:

This is simply a measure of the acidity / alkalinity of a solution.

The pH measures the hydrogen ion concentration while the pOH measures the hydroxide ion concentration

The pH scale is a scale that gives an understanding of the variation of the acidity / alkalinity of a solution.

The scale ranges from 0 to 14 indicating:

These are devices / equipment used to indicate if a solution is acidic, neutral or basic.

From the question given above, we were told that the universal and the cabbage pH indicator gives the same result.

Therefore, we can conclude that the cabbage indicator is indicating the proper pH (Option A)

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Explanation:

Used to separate one reactant or product from another

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Answer:

A small amount of chemical splashes in Frank's eye. What should happen next? Frank should go to the eyewash station while his lab partner tells the teacher what happened.

Explanation:

Brainlist

Answer:

7.44%

Explanation:

\(\frac{6.44}{6.44+80.1} *100=7.44\)

Answer:

0.3 hours of oxygen use will be obtained from the 4.7 L tank.

Explanation:

The rule of three or is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them. That is, what is intended with it is to find the fourth term of a proportion knowing the other three.

To solve a direct rule of three, where a, b and c are known data and x is the value to be calculated  the following formula must be followed:

a ⇒ b

c ⇒ x

So \(x=\frac{c*b}{a}\)

A value of 15 L/hour indicates that 15 L is consumed in 1 hour. The following rule of three can then be applied: if the average basal rate of oxygen consumption for an adult is 15 L in 1 hour, then 4.7 L in how long will it be consumed?

\(time=\frac{4.7 L*1 hour}{15 L}\)

time= 0.3 hours

0.3 hours of oxygen use will be obtained from the 4.7 L tank.

In comparison to modern, highly accurate density meters or pycnometers, hydrometers are far less accurate and temperature.

Thus,  Although they require very large sample sizes, hydrometers are rather simple to operate. Usually, 300 to 500 ml per measurement are required. Hydrometers frequently require calibration off-site as well.

With measurements taken by eye, user error is a major issue, and temperature management is especially challenging. Inaccurately bringing and maintaining samples at temperature might take a long time, and once more, user perception of temperature levels is used to determine temperature levels.

Pycnometers and hydrometers have a further problem in that the findings of alcohol measurement are challenging to evaluate and record.

Thus, In comparison to modern, highly accurate density meters or pycnometers, hydrometers are far less accurate and temperature.

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Answer: pure water is homogeneous and pure substance.

Explanation: However, when a homogeneous substance consists of two or more different types of molecules uniformly intermingled with one another, then it’s called a homogeneous mixture. A mixture’s composition can vary, but a pure substance does not.

Answer:

True

Explanation:

since the gases and minerals dissolved in water are in the same state as water and they do not form separate layers

Answer:

At equilibrium, the system will move to the right to regain equilibrium