How can we see all four colors from a hydrogen gas dischrarge tube simutaneously?

The density of the pebble is 2.5g/cm³

CALCULATE DENSITY:

Density = mass (g) ÷ volume (mL)

Density = 35g ÷ 14cm³

Density = 2.5g/cm³

Therefore, the density of the pebble is 2.5g/cm³

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Answer:

An inorganic peroxide consisting of two hydroxy groups joined by a covalent oxygen-oxygen single bond. Hydrogen peroxide is a chemical compound with the formula H2O2.

Answer:

Even though plants are rooted in the ground, they still move, exert force, and do work.

Plant cells have very strong cell walls that allow pressure to build up inside of the cell as water is absorbed. This pressure is called turgor.

When turgor pressure is high enough in a cell, the cell walls become firm and as a result, the cell becomes rigid and the plant is able to stand tall and straight.

When a plant does not get enough water, the turgor pressure inside of the cells decreases. A decrease in pressure pushing against the cell wall causes the cells to lose their shape and shrink. This causes the plant to begin to droop or wilt.

When the wilted plant gets enough water, the cells will become rigid again, and the plant will stand firm and straight once again.

Explanation:

The correct order of increasing strength of intermolecular forces is C*H_{4} < C*H_{3}*C*H_{3} < C*H_{3}*C*H_{2}*C*H_{3}. Hence, the option (d) is correct.

The strength of intermolecular forces depends on the type of molecules present. There are three types of intermolecular forces that are generally present in molecular substances: van der Waals forces, dipole-dipole forces, and hydrogen bonding. These forces increase in strength as the polarity of the molecule increases. Vanderwaal's forces are considered the weakest intermolecular force between molecules. Van der Waals forces are also called dispersion forces, London forces, or instantaneous dipole forces. These forces arise when there is a temporary formation of dipoles between atoms. These are more pronounced in larger molecules as there is more space for temporary dipoles to occur, which implies that CH4 has the weakest Vanderwaal's forces due to the presence of multiple carbon atoms and the presence of hydrogen atoms in between them. CH3CH3 has a higher intermolecular force than CH4.

Therefore, CH3CH3 has higher intermolecular forces than CH4 and CH3CH2CH3 has the highest intermolecular force out of the three.

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Bohr: Electrons move in circular paths that have different energies.

Thomson: Atoms contain electrons.

Dalton: Matter is made up of indivisible atoms.

Schrodinger and others: Electrons exist in a cloud of probability.

Rutherford: The mass of an atom is concentrated in its center.

Answer:

The screenshot shows all the answers

Explanation:

Explanation:

it is the one you have selected because it is the only solid one

Answer:

Hey mate here's your answer ⤵️

a mark or character used as a conventional representation of an object, function, or process, e.g. the letter or letters standing for a chemical element or a character in musical notation.

noun: letter, character, sign of written communication

Something used for or regarded as representing something else; a material object representing something,

or a character of some kind

Example:

Often something immaterial; emblem, token, or sign: "$"<< the dollar sign is a symbol used to show / means money

Hope this kinda helped

The value of  \(K_{sp}\)  for PbS is \(9.0\times10^{-29}\).

Molar solubility (M) is a unit of measurement for a compound's capacity to dissolve in a particular liquid, also known as a solvent. Molar solubility is measured in terms of \(\frac{moles}{litre}\) since it is the most moles of a solute that can dissolve in one liter of solvent. The solution is said to be saturated when it can no longer dissolve any more solute and the number of moles dissolved in a liter of solvent equals the molar solubility.

Lead(II) sulfide is a poorly soluble salt compound in water with the following Solubility Equilibrium:

\(PbS(s)\Longleftrightarrow Pb^{+2}(aq)+S^{-2} (aq)\)

\(K_{sp}=[Pb^{+2}][S^{-2} ]\)

The compound dissociates in a 1:1 ratio of ions, therefore the molar Solubility is 's' in water will be :

s=\(9.5\times10^{-15}\).

\(K_{sp}=s\times s=s^{2}\)

\(K_{sp}=(9.5\times10^{-15} )^{2}\)

\(K_{sp} =9.0\times10^{-29}\)

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The value that would be put in the numerator of this calibration would be 10° C .

The process of calibrating an instrument involves setting it up such that it can produce results for samples that are within a reasonable range. A key component of instrumentation design is eliminating or reducing conditions that lead to faulty measurements.

In order to ascertain the mistake or confirm the precision of the unknown value of the DUT, a calibration is normally carried out. As a simple illustration, you may calibrate a DUT thermometer by measuring its temperature in water at its known boiling point (212 degrees Fahrenheit) in order to determine the thermometer's inaccuracy.

To obtain accurate readings, a thermometer must be calibrated because its precision is susceptible to deterioration over time. Thermometers can change over time for a variety of reasons.

Hence, The value that would be put in the numerator would be 10° C because difference between two marked values or space between two marked value is 10.

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Answer:

Prokaryotic cells contain DNA, contain ribosomes, and lack a nucleus.

Answer:

Contains DNA

Contains Ribosomes

lacks a nucleus

Explanation: I took the quiz on edge

The correct answer to the question is: the process will be spontaneous at any temperature.

ΔG is the amount of energy available to do useful work in a system. It is related to ΔH and ΔS through the equation ΔG = ΔH - TΔS, where T is the temperature in Kelvin.

If ΔG is negative, the process is spontaneous (meaning it will happen on its own without any external energy input), and if ΔG is positive, the process is nonspontaneous (meaning it will not happen on its own without external energy input).

Using the given values of ΔH = -214 kJ/mol and ΔS = 450 J/mol.k, we can calculate ΔG at different temperatures. However, we first need to convert ΔH from kJ/mol to J/mol by multiplying by 1000:

ΔH = -214,000 J/mol

Now we can calculate ΔG at different temperatures using the equation above:

At 298 K (room temperature):

ΔG = -214,000 J/mol - (298 K)(450 J/mol.K) = -349,100 J/mol

Since ΔG is negative, the process is spontaneous at room temperature.

At a high temperature (e.g. 1000 K):

ΔG = -214,000 J/mol - (1000 K)(450 J/mol.K) = 36,000 J/mol

Since ΔG is positive, the process is nonspontaneous at high temperatures.

At a low temperature (e.g. 100 K):

ΔG = -214,000 J/mol - (100 K)(450 J/mol.K) = -229,500 J/mol

Since ΔG is negative, the process is spontaneous at low temperatures.

Therefore, the correct answer to the question is: the process will be spontaneous at any temperature.

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According to the given reaction,  164.6 grams of zinc hydroxide will be formed upon the complete reaction of 29. 8 grams of water with excess zinc oxide.

The balanced chemical equation for the reaction is:

\(ZnO(s) + H_2O(l) - Zn(OH)_2(aq)\)

From the equation, we can see that one mole of \(ZnO\) reacts with one mole of \(H_2O\) to produce one mole of \(Zn(OH)_2\). Therefore, we need to first calculate the number of moles of \(H_2O\) in 29.8 g of water, and then use stoichiometry to calculate the amount of \(Zn(OH)_2\) produced.

The molar mass of water is 18.015 g/mol, so the number of moles of \(H_2O\) in 29.8 g of water is:

Moles of \(H_2O\) = 29.8 g / 18.015 g/mol

                      ≈ 1.656 mol

Since there is excess \(ZnO\), we can assume that all the \(H_2O\) reacts completely. Therefore, the number of moles of  \(Zn(OH)_2\)  produced is also 1.656 mol.

The molar mass of \(Zn(OH)_2\) is:

Molar mass of \(Zn(OH)_2\) = 2(65.38 g/mol) + 2(1.01 g/mol) + 2(16.00 g/mol)

                                       = 99.39 g/mol

Therefore, the mass of \(Zn(OH)_2\) produced is:

Mass of \(Zn(OH)_2\) = 1.656 mol x 99.39 g/mol

                             ≈ 164.6 g

So, 29.8 grams of water reacting with excess \(ZnO\) produces approximately 164.6 grams of \(Zn(OH)_2\).

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Answer:

b. 62 g, which should equal the total mass of the products

Explanation:

According to the law of conservation of mass, which states that mass of a substance can neither be created nor destroyed, hence, the mass of the reactants of a reaction must be equal to the mass of the products in that reaction.

As stated in this question, if the total mass of reactants is 62g, then, in accordance to the law of conservation of mass, the total mass of products should also be equal to 62g.

The standard molar enthalpy for the reaction C(s) + ½ O2(g) → CO(g) is -111KJ.

Molar enthalpy is the amount of energy per mole. In light of this, the primary distinction between enthalpy and molar enthalpy is that the former refers to the total heat content of a thermodynamic system, whereas the latter refers to the total heat per mole of reactant in the system.

C(s) + O₂(g) → CO₂(g)    ΔHO = -394 kJ ----(1)

CO₂(g) → CO(g) + 1/2O₂(g)      ΔHO = +283 kJ -----(2)

Adding 1 & 2

C(s) + ½ O₂(g) → CO(g)  

ΔHO = -394 kJ + 283 kJ

ΔHO = -111KJ.

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Complete question is " Find the standard molar enthalpy for the reaction C(s) + ½ 02(g) → CO(g)

Given that

C(s) + O2(g) → CO2(g) AHO = -394 kJ

CO2(g) → CO(g) + ¹/2O2(g) AHO = +283 kJ ".

Answer:

v-rel = 16.8

Make sure to read the explaination so you can solve it yourself!

Explanation:

I had this same question on Acellus, here is how I answered it:

Equation being used:   Δf = 2*fο*vrel/c

( this equation can be found in the  bottom of the lesson manual in the help tab)

Where,

Δf = change in frequency; 672

fο = frequency before being doppler shifted; 6.00 * 10^9

vrel = relative velocity; unknown

c = speed of light; 3.00 * 10^8

Now that we have written the numbers we know down, we must rearrange the equation for the velocity (vrel)

Starting Equation:

Δf = 2*fο*vrel/c

Multiply by c, then divide by 2fo to isolate vrel.

This will leave us with the equation:

Δfc/2fo, now we plug in the numbers

(672 * (3*10^8)) / (2* (6.00*10^9))

Once we plug this into the calculator, you should get

16.8

I hope this helped you, Wawawewa!

Answer:

atomic number 8 and atomic number 12

Explanation:

atomic number 8 and atomic number 12 , element with the atomic number 8 is oxygen, and the element with atomic number 12 is Magnesium

Magnesium has low ionization energy, hence higher tendency to loose its two outermost electrons to form positive ion.

Oxygen has high electron affinity, hence higher tendency to accept or gain electrons to form negative ion.

The electronegativity difference between the element with atomic number 8 and element with atomic number 12 is greater for the formation of ionic bond

There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, the correct option is option C.

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

An ionic compound is a metal and nonmetal combined compound.  Ionic compound are very hard. They have high melting and boiling point because of strong ion bond.

atomic number 8 =oxygen

atomic number 12= Magnesium

Magnesium has a low ionization energy and so a greater proclivity to lose its two outermost electrons to create a positive ion. Because oxygen has a high electron affinity, it is more likely to accept or acquire electrons to create a negative ion.

Therefore, the correct option is option C.

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Answer:

Solids, liquids, and gases are made of tiny particles called atoms and molecules. In a solid, the particles are very attracted to each other. They are close together and vibrate in position but don't move past one another. In a liquid, the particles are attracted to each other but not as much as they are in a solid.

Answer:

B -1 and +7

Explanation:

Iodine shows oxidation states of −1, +1, +3, +5, or +7.

Answer:

20 km per hour

Explanation:

Answer:

20.1 kmph

Explanation:

Since you usually need the answer to be a unit rate, where the denominator is always 1, you need to divide by whatever the numerator, the km, by the denominator, the hours. 40.2/2 is equal to 20.1.

Answer:

open system

Explanation:

An open system is a system in which both energy and matter are exchanged with the surroundings.

The sulfur di-oxide may lower ais temperature after a volcanic eruption through volcano.

A volcanic eruption occurs when a volcano releases lava and gas, sometimes explosively. A 'glowing avalanche,' which occurs when newly erupted lava slides down the flanks of a volcano, is the most deadly sort of eruption.

A volcano is a crack in a planetary-mass object's crust that permits hot lava, volcanic ash, including gases to escape from just a magma chamber under the surface, such as Earth.

Volcanoes release a variety of gases along with particles into the atmosphere when they erupt. Because they  reflect sunlight away from the earth, some of them, like ash and sulfur dioxide, have just a cooling effect. Others, such as CO2, contribute to global warming by increasing the greenhouse effect.

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Answer:

1J = 0.238846cal

52J = 12.42cal

Option (d), P=ATC=MR=MC, accurately represents the long-run equilibrium condition for perfect competition, reflecting the balance between price and cost for firms operating in a competitive market.

The long-run equilibrium condition for perfect competition is that price (P) is equal to average total cost (ATC), which is also equal to marginal cost (MC), and marginal revenue (MR).

Option (d), P=ATC=MR=MC, best represents the long-run equilibrium condition for perfect competition. In perfect competition, firms operate at the minimum point of their average total cost curve, where price equals both average total cost and marginal cost. This condition ensures that firms are earning zero economic profit and are producing at an efficient level.

In the long run, if firms are earning economic profit, new firms will enter the market, increasing competition and driving prices down. Conversely, if firms are experiencing losses, some firms may exit the market, reducing competition and causing prices to rise. This process continues until firms reach a state where price equals average total cost, marginal cost, and marginal revenue, ensuring a long-run equilibrium.

Therefore, option (d), P=ATC=MR=MC, accurately represents the long-run equilibrium condition for perfect competition, reflecting the balance between price and cost for firms operating in a competitive market.

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Answer: Energy is absorbed, and kinetic energy increases

Explanation:

Pls mark brainliest :)

Answer:

City B has the larger annual temperature range

Explanation:

This is correct option because generally the northern side of the equator is high in temperature than the southern hemisphere part.

Since the southern side of the equator or Southern Hemisphere, where city A resides will generally have higher altitude or rise, so this creates higher average temperature.

The mole fraction of \(CH_3OH\)in the solution is 0.850 or 85.0%.

To calculate the mole fraction (Χ) of methanol (CH3OH) in the given solution, we need to determine the number of moles of CH3OH and the number of moles of \(C_6H_5COOH\)(benzoic acid) in the solution.

First, we can calculate the number of moles of CH3OH using its volume and density:

Mass of CH3OH = Volume x Density = 8.50 mL x 0.792 g/mL = 6.732 g

Number of moles of CH3OH = Mass / Molar mass = 6.732 g / 32.04 g/mol = 0.210 mol

Next, we can calculate the number of moles of \(C_6H_5COOH\)using its mass and molar mass:

Number of moles of C6H5COOH = Mass / Molar mass = 4.53 g / 122.12 g/mol = 0.0371 mol

The total number of moles of solute in the solution is the sum of the moles of CH3OH and C6H5COOH:

Total number of moles = 0.210 mol + 0.0371 mol = 0.247 mol

Finally, we can calculate the mole fraction of \(CH_3OH\)using its number of moles and the total number of moles:

Mole fraction of \(CH_3OH\)= Number of moles of \(CH_3OH\)/ Total number of moles = 0.210 mol / 0.247 mol = 0.850

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The presence of mutations in the gene’s promoter region could be disrupting transcriptional activation.

Tumor suppressor mutations can be defined as a type of genetic alteration capable of disrupting the expression of normal genes. These genes (tumor suppressor genes) lead to avoiding the emergence of cancer cells, and mutations may occur both in the coding gene as well as non-coding regulatory regions.

Therefore, with this data, we can see that tumor suppressor mutations are mutations related with the modification of the DNA sequence not only in the protein coding gene region but also in its regulatory fragment.

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Answer:

Homeostasis

Explanation:

The longer you are awake the longer your body has the feeling of rest and the least you are awake the faster your body will wake up since it has had enough rest.

Molecules must collide to react. Molecules with the correct collision orientation may collide without resulting in a chemical reaction are true.

In a collision, there is a force on both Molecules that accelerates them in the opposite direction and with equal magnitude. Each object feels the same acceleration in collisions with objects of equal mass. Products are produced as a result of molecular collisions. However, not all collisions produce products because a minimum amount of energy is needed. The smallest energy is referred to as activation energy. There must be enough energy for molecules to collide. molecules must collide in the correct direction. In a collision, there is a force on both objects that accelerates them in the opposite direction and with equal magnitude. Each object experiences the same acceleration in collisions between objects of equal mass. Instead, you get an acceleration as a result of the collision and a force  that results from the collision.

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Molecules must collide to react.

Molecules with the correct collision orientation may collide without resulting in a chemical reaction.

Molecular collisions that occur with a kinetic energy that exceeds the energy of the

The statement molecules must collide to react. Molecules with the correct collision orientation may collide without resulting in a chemical reaction are true.

For a chemical reaction to occur, the reacting species (atoms or molecules) must collide. Every collision does not bring about chemical changes. According to Arrhenius' equation, only the collisions with proper orientation and possessing internal energy, equal to the activation energy will bring the chemical change, such collisions are called Effective collisions. Thus, in accordance with collision theory, the frequency of effective collisions is equivalent to the speed at which chemical reaction advances.

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