The work function of iron is 4.50 eV.
What frequency of light will create
photoelectrons with a KE of 1.88 eV?

Answer:

The substance is acidic.

Explanation:

When a substance is able to dissolve in water, it means that it is ionic. This just means that the polarity of the water and the polarity of the substance will attract each other to their positive and negative ends respectively. (Positive attracts negative and negative attracts positive).

Litmus paper that is blue and then turns red when introduced to a substance, is known to be acidic.

The opposite can be said when red litmus paper turns blue when introduced to a substance; this means the substance is basic.

Also, if it is sour, then that means it is acidic! Some examples of sour things that are acidic are soft drinks, apples and lemons/limes.

In a parallel circuit with identical light bulbs, the true statement is option D Adding more identical light bulbs will not change their brightness.

Two bulbs in a simple parallel circuit every experience the overall voltage of the battery. that is why the bulbs in the parallel circuit might be brighter than the ones within the series circuit. some other gain to the parallel circuit is that if one loop is disconnected, then the other stays powered.

While batteries are connected in parallel, the voltage remains the same, but the contemporary which could float in the circuit will increase. when bulbs have equal power, then their resistance is likewise the same. while the 2d bulb connected in parallel to the first bulb is switched on, the effective resistance of the circuit turns into half of, and the present-day circuit becomes double. due to it, this double modern-day divides itself equally into bulbs.

The voltage across every resistor inside a parallel aggregate is precisely equal however the currents flowing through them are not the same as that is determined by their resistance fee and Ohms regulation.

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Answer:

[tex]C_{2}[/tex][tex]H_{6}[/tex]O  This can be one of two componds:  ethanol or dimethyl ether.

Explanation:

I'm having trouble interpreting:

Η Η | | H—C-C-0-HHH

The manner in which a chemical structure is written plays a large roll in how to interpret what compund it is.  In this case we can count 2 carbons, 1 oxygen, and 6 hydrogens.

From this, we are tempted to quickly conclude and write:

[tex]C_{2}[/tex][tex]H_{6}[/tex]O

and state that this is clearly ethanol.  Why would it be anything else?

Although this is a correct possible interpretation of the information, but [tex]C_{2}[/tex][tex]H_{6}[/tex]O it has at least two different structures:  ethanol and dimethyl ether.  See the attached diagram.

Most combination of elements can have more than 1 structure, and are therefore different compounds.  Because if this, the manner in which the structure is drawn is essential to how it is interpreted.  Even the formula notation has certain rules designed to help identify the compound.  The attached diagram illustrates the two ways ethanol and dimethyl ether can be lav=belled:  C2H5OH, which highligts the -OH group and identifies it as an alcohol.  Dimethyl ether has the O atom at the end, without the H atom stuck behind it.  This signals that it is incorporated somewhere else in the molecule.

By using the acid – base extraction process, we can separate the given organic compounds.

A liquid-liquid extraction is a type of acid-base extraction. It usually includes differing amounts of solubility in water and an organic solvent. Any carbon-based liquid that does not dissolve well in water can be used as the organic solvent; prominent examples include ether, ethyl acetate, and dichloromethane.

Acid-base extraction is a method of purifying acids and bases from mixtures depending on their chemical characteristics by employing consecutive liquid-liquid extractions.

In this scenario, acid-base extraction is required since it is also employed to separate the two different weak acids or two weak bases with a considerable variation in their pKa (as observed in this case). In the case of acids, the considerably stronger acid with a low pKa value (here, pKa is 2) is neutralized to a salt by utilizing a weak base. Only the stronger acid is converted into a salt when the weak base reacts inefficiently with the weaker acid. The salt is then extracted into the aqueous phase while the other weakly acidic chemical stays dissolved in the organic solvent, which in this case is ether. We can now separate the aqueous and organic phases using a separatory funnel.

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When an acid and a base react, the base balances the acid, creating salt and water as a result..

2NaoH+ H2SO4----> Na2SO4 + H2O

Both sulfuric acid H2SO4 and sodium hydroxide NaOH are powerful acids and bases, respectively.

This reaction is exothermic in nature and is referred to as the neutralizing reaction (since heat is released during the reaction as there is formation of new bonds).

a). If you left your aqueous sodium sulfite solution open on the side, air oxygen would catalyze the chemical shift, the water would hydrate the new compound, and the slow evaporation of water would give you wonderful huge crystals of Na2SO4 without you having to do anything.

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The expression equivalent to -3(4x + 3y) is -12x - 9y

The expression we have is = -3(4x+3y)

We will apply the distributive property to find the correct expression,

The distributive property-

It states that when the sum of two or more variable are multiplied by a number gives the exact similar result as when each variable is multiplied separately by the number, and the products of both are added together.

The distributive property of the addition is given as -

A(B + C) = AB + AC

The distributive property of the subtraction is given as -

A(B - C)  = AB - AC

We know the expression is -3(4x + 3y)

We will apply the distributive property in the given expression

-3(4x + 3y) = -12x - 9y

Hence, the expression equivalent to -3(4x+3y) is -12x-9y

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The sample that should be considered concentrated solution of Povidone Iodine is 50 drops of Povidone Iodine dissolved in 100 ml of water. That is option D

A concentrated solution is defined as the type of solution that contains more dissolved solute with less solvent when compared with other solutions.

A solute is defined as the part of a solution that dissolves in a solvent while the solvent is part of the solution that is the dissolving medium.

From the options listed, the most concentrated solution is the solution that contains more of the povidone iodine which is 50 drops of Povidone Iodine dissolved in 100 ml of water.

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Answer:

use the pH equation :

pH: -log [H+]

pH: -log 1×10^-11

pH: 11.00

the pH of the solution is 11.00 and the solution is basic.

and make sure to remember :pH does not have a value .

a solution merely has pH(11.00)

The significance of gallium is explained below

The atomic number and symbol for the chemical element gallium are 31. The discovery was discovered in 1875 by French chemist Ga. Paul-Émile Lecoq de Boisbaudran. Gallium is a similar metal to the other elements in Group 13 of the Periodic Table (aluminium, indium, and thallium).

Under normal pressure and temperature, gallium is a soft and silvery element. When it's liquid, it takes on an icy white hue. Using too much force could cause gallium to shatter conchoidally. Since its discovery in 1875, gallium has been frequently used to produce alloys with low melting points. It is also used in semiconductors as a dopant on semiconductor substrates.

In 1875, a French chemist by the name of Paul Emile Francois Lecoq de Boisbaudran made a spectroscopic discovery of a new element while studying zinc blende. The properties of this freshly discovered element matched those of the eka-aluminum, which has an atomic weight of 69, as predicted by Mendeleev. The specific gravity of the element was later determined to be 5.9, as predicted by Mendeleev. The substance was then given the name gallium by Lepoq, who so elevated Mendeleev's periodic table and supported Mendeleev's theories.

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Answer:60 miles in one hour

Explanation:

The energy of the photon to will be calculated by using E=hv.

Photons are fundamental subatomic particles that carry electromagnetic force — or, to put it another way, they are light particles. The energy of a photon is calculated by determining the wavelength of the photon. To do this, we need to know the frequency of the light and its speed in a vacuum.

A hydrogen atom emits a photon with a frequency of about 6.6x1014 Hz and a speed in a vacuum of 3.0x108 m/s.

The value for E = hν is:

E = hν

= Planck's Constant × Frequency × Wavelength

= hc/(2π×frequency × wavelength)

The unit of energy is given by Joules(J).

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Answer:

too lendi to answer the question

The statement planets revolve around the sun in an elliptical pattern because of the respective gravitational forces that interact between the sun and the other planets is an example of a theory (Option 3).

A scientific theory is a statement well-sustained by scientific evidence, which is empirical because it is testable, i.e. we can confirm or reject it by experimentation, and predictable

Therefore, with this information, we can conclude that a scientific theory is based on empirical evidence that we can test and confirm by experimental or observational procedures.

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Answer:

Ballistic vests use layers of very strong fibers to "catch" and deform a bullet, mushrooming it into a dish shape, and spreading its force over a larger portion of the vest fiber. The vest absorbs the energy from the deforming bullet, bringing it to a stop before it can completely penetrate the textile matrix.

The acid ionization constant of a solution is represented as Ka. The Pka is the negative logarithm of Ka value. The ka value of the acid with pka of 5.2 is 6.3 × 10⁻⁶ .

Acid ionization constant is the ratio of product of concentration of the ions in the acid to the molar concentration of the acid.

If and cid HA ionizes into H+ and A- then ionization constant Ka is written as follows:

Ka = [A-] [H+] / [HA]

Mathematically pka is the negative logarithm of ka value. The pka value is given 5.2 thus ka value is calculated as follows:

pka = -log (Ka)

- 5.2 = log (Ka)

Ka = antilog (5.2)

     =  6.3 × 10⁻⁶.

Therefore, ka value of the acid with pka of 5.2 is 6.3 × 10⁻⁶ .

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Option C (4.8 × 10²³ ions) is correct not option B (1.2 × 10²³ ions) as one molecule of (NH₄)₃PO₄ contains four ions, three NH₄⁺, and one PO₄⁻³.

To calculate ions, first, we have to calculate number of molecules of (NH₄)₃PO₄ in 0.20 moles.

To calculate number of molecules, the number is moles is multiplied by Avogadro number (6 × 10²³).

So, the number of molecules of (NH₄)₃PO₄ in 0.20 moles is,

Number of molecules = 0.20 × 6 ×10²³ = 1.2 × 10²³

One molecule of (NH₄)₃PO₄ contains three ions of NH₄⁺, and one ion of PO₄⁻³. So, number of ions in 0.20 moles of (NH₄)₃PO₄ are

Number of ions = 4 × 1.2 × 10²³ =4.8 × 10²³

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The change in the reactor size of the Plug flow reactor for gas phase reactions is by a factor of 1.5 in the volume.

Chemical engineers typically utilize a model known as the plug flow reactor model (PFR, also known as continuous tubular reactor, CTR) to explain chemical reactions in continuous, flowing systems with cylindrical shape. Since it has no moving components, the tubular reactor (also known as the plug flow reactor [PFR]) is one of the flow reactors that typically achieves the maximum conversion per reactor capacity.

The single-step chemical reactions that take place in the gas phase are the easiest to understand. Both intramolecular and intermolecular reactions occur in the gas phase.

The performance equation of Plug flow reactor (PFR):

[tex]\frac{V_P}{F_A_0} = \int\limits^{X_A}_0 \frac{dX_A}{(-r_A)}[/tex]

where,

[tex]V_P[/tex] – reactor volume in [tex]m^3[/tex]

[tex]F_{A0}[/tex] – molar feed rate (C + A in feed)

Let [tex]F_{A0}[/tex] = 100 mol/s

i.e.,

[tex](F_{A0})_A[/tex] = 50 mol/s

[tex](F_{A0})_C[/tex] = 50 mol/s

So,

[tex]{V_P} = 100 \int\limits^{X_A}_0 \frac{dX_A}{(-r_A)}[/tex]

When [tex]F_{C0}^'[/tex] = 2[tex]F_{C0}[/tex] (doubled) with same conversion [tex]X_A[/tex]

Then,

[tex]{V_P^'} = 50 + 100 \int\limits^{X_A}_0 \frac{dX_A}{(-r_A)}[/tex]

Therefore,

Volume, [tex]V_P^'[/tex] = 150 / 100 = 1.5

Result:

The volume of the plug flow reactor changes by a factor of 1.5

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The ocean using as an energy resource interact in both positive and negative ways within each of Earth's crust as the ocean produces two types of energy, these are thermal energy from the heat of sun, and mechanical energy from the tides and waves.

For example, when ships transport oil, the waste water is occasionally dumped. It means that ships may release some amount of pollution into the ocean and air. Some of the heat which is stored in the ocean could power the entire planet.

These ocean energy sources, both thermal energy and mechanical energy are non-polluting, dependable, and highly predictable. Oceans covers more than 70% of the surface of Earth. It makes them the greatest solar collectors on the planet.

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that is for hydrogen, fluorine and aluminium

Answer:

A galaxy is huge group of solar systems, planets and star's e.t.c. There is a possibility of a similar planet to Earth since the universe is massive and we haven't discovered all of it yet.

Answer:

do that in calc

Explanation:

mass of cu = 63.55 ÷ 79.55 × 15.9

The atomic theory developed along the experiments of the  Cathode Ray Tube, Gold Foil and Atomic Emission Spectra.

The term atomic theory has to do with the arrangement of the particles that compose the atom. Let us look at the development of the atomic theory chronologically.

Cathode Ray Tube - In the cathode ray tube, J.J Thompson was able to pass  an electric discharge through the tube and a color was observed that corresponds to the gas in the tube.

Gold foil experiment - Here, thin gold foils were bombarded with alpha particles and the movement of the alpha particles were tracked.

Atomic emission spectra - Here, electrons were excited to different wavelengths and the corresponding spectra was observed.

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Answer: New Pressure = 10.80 atm

The moles of sodium hydroxide when you have 350.0 ml of a 0.650 m sodium hydroxide solution is 0.2275 moles.

According to the definition of molarity, we can draw the definition of 1M as

If 1 Mol of solute is present in 1000 mL of solution, then the solution will be called one molar ( or 1M)

​Thus in the given problem 0.650 M of NaOH means,

1000 mL of solution contains 0.650 M NaOH

So, 350 mL  0.650 M NaOH solution will contain

0.650 × 350/1000 moles of NaOH.

That is equal to  0.2275 moles of NaOH.

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0.112 L CO₂ is the volume of carbon dioxide.

Glucose ferments decompose to form the ethanol and carbon dioxide.

Balanced equation :  C₆H₁₂O₆  ----> 2C₂H₅OH (aq) + 2CO₂ (g)

By using formula, M= m/n

Where,

M⇒ Molar mass

m⇒ Mass of a substance (in grams)

n⇒ Number of moles of a substance

The molar mass (M) of C₆H₁₂O₆ (aq) ⇒180.156 g/mol

Calculating the moles(n) of C₆H₁₂O₆(aq) .

n ⇒ m/M

m ⇒ mass ⇒ 0.9 C₆H₁₂O₆

M ⇒ molar mass

n ⇒180.156g/mol C₆H₁₂O₆

n ⇒ 0.9g C₆H₁₂O₆/ 180.156 g/mol

n⇒ 0.005 mol C₆H₁₂O₆

Calculating moles(m) of CO₂ :

m⇒0.005 mol CaCO₃× (1 mol CO₂/1 mol  C₆H₁₂O₆)

m⇒ 0.005 mol CO₂

At STP of 273.15 K (0°C) and 1 atm, the molar volume of a gas is 22.414 L/mol.

Calculating volume of CO₂ :

Multiply the mole CO₂ by the molar volume to get the volume of CO₂ in liters.

⇒ 0.005 mol CO₂× 22.414 L/mol

⇒ 0.112 L CO₂  to three significant figures

Converting volume CO₂ in L to mL.

⇒ 0.112 L CO₂ × 1000 mL/L

⇒ 112.07 mL CO₂

Volume of CO₂ ⇒ 0.112 L CO₂  or 112.07 mL CO₂

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