In a future hydrogen-fuel economy, the cheapest source of H₂ will certainly be water. It takes 467 kJ to produce 1 mol of H atoms from water. What is the frequency, wavelength, and minimum energy of a photon that can free an H atom from water?

Answer:

Oxygen: Carbon Dioxide

O2:2CO2

1:2

The LD50 (Lethal Dose 50) is a measure used in toxicology to determine the lethal dose of a substance that would cause death in 50% of the test population.

However, it is important to note that conducting experiments to determine the LD50 of a substance on humans is unethical and illegal. The LD50 values are typically determined through animal testing, usually on rodents such as rats or mice.To calculate the amount of a substance that would harm a person of a certain weight, various factors need to be considered, including the toxicity of the substance and the individual's weight. In toxicology, a commonly used measure is the oral median lethal dose (LD50) expressed as milligrams per kilogram of body weight (mg/kg).To estimate the harmful dose for an individual of a certain weight, you would need to know the LD50 value of the substance and apply it to the weight of the person. The calculation involves multiplying the LD50 value by the person's weight in kilograms. However, it is crucial to emphasize that estimating harmful doses for humans based on animal LD50 values alone can be inaccurate and potentially dangerous.

It is essential to consult professionals in toxicology or poison control centers to obtain accurate information regarding the toxicity of a substance and its potential effects on human health.

for such more questions on substance

https://brainly.com/question/29108029

#SPJ8

The equilibrium constant for the phosphorylation of glucose to glucose 6-phosphate (G6P) may be estimated using the chemical reaction equation and the process's standard Gibbs free energy change.

The chemical process for phosphorylating glucose to G6P is as follows: G6P + ADP = glucose + ATP Using the standard Gibbs free energy changes for the reactants and products, as well as the standard reaction quotient, the standard Gibbs free energy change (G°) for the reaction may be computed (Q). The conventional Gibbs free energy change is written as: ΔG° = ΔG°f(products) (products) - ΔG°f(reactants) (reactants) The standard reaction quotient (Q) may be computed using the reactant and product concentrations at equilibrium. The equilibrium constant (Kc) is then computed as the product ratio. Ratio the products' activities (or concentrations) to the product of the reactants' activities (or concentrations), raised to the power of their stoichiometric coefficients: [G6P][ADP] / [glucose] = Kc To determine the equilibrium constant, the values for G°, the activities (or concentrations) of the reactants and products, and the stoichiometric coefficients must be known. Furthermore, the value of the equilibrium constant changes with temperature and must be recalculated whenever the temperature changes.

learn more about phosphorylation  here:

https://brainly.com/question/29104695

#SPJ4

Answer:

The main cause of global convection currents is the uneven heating of the earth by the sun. Hope this helped! :)

The main cause of global convection current is differential heating, that is the temperature difference in different levels of  atmosphere.

Convection current  is the heat transfer by fluid movement in the earth crust between different temperature regions. The density of fluids differs due to the temperature gradients and thus heated fluids raises and cooled fluid sinks.

The heated fluid movement causes the movement of plates of earth. The molten rock deep inside the earth crust circulates by the convection current.

Hence, the main cause of global convection current is the differential heating of the atmosphere.

To know more about convection currents, refer the link below:

https://brainly.com/question/9739063

#SPJ2

An element cannot be converted together into simpler substance since it is a pure material made up of just one type of atom.

Matter is everything that occupies space and appears to have mass; in other words, substance is really the "stuff" that now the cosmos is made of. They don't change into other elements through normal chemical processes and have distinct chemical and physical properties.

A material that is frequently referred to this as matter and that has a specific mass and volume distributed throughout space. Matters include things like pens, notebooks, toothbrushes, glasses, and milk, to name a few.

To know more about matter visit:

https://brainly.com/question/2246399

#SPJ4

The amount of copper produced might be less than 100% of the expected amount because the actual yield is usually less than the theoretical yield.

The efficiency of yield is calculated in the form of %age yield by the following formula

%age yield = actual yield/theoretical yield x 100%

The actual yield is often less than the theoretical yield due to the following reason

#SPJ4

The atomic number 35 and symbol Br identify the chemical element bromine. The third-lightest halogen, it is a volatile reddish-brown liquid that easily evaporates to produce a vapour of a similar color. Its characteristics fall in between iodine and chlorine.

Bromine's electron configuration is [Br]4s^2.3d^10.4p^5

A maximum of two electrons can fit into a s subshell, six into a p subshell, ten into a d subshell, and fourteen into a f subshell.

The maximum number of electrons in a subshell and the number of orbitals may both be calculated using the angular momentum quantum number, l, which stands for various subshells. These quantities can be found using the formulas 2 ( 2 l + 1 ) and 2 l + 1 correspondingly.

The s subshell is represented by a l of 0, the p subshell by a l of 1, the d subshell by a l of 2, and the f subshell by a l of 3.

To know more about electron configuration of bromine, click on the link below:

https://brainly.com/question/12846059

#SPJ9

A food that excites the taste receptors that allow positively charged hydrogen ions to enter cells is likely to have a sour taste.

One of the original four basic taste qualities, sour taste has long been recognised as a distinct taste sensation and is uniformly unfavourable across a wide range of species. It is elicited by low pH.

It is typically accepted that it originated for the purpose of detecting acids in underripe fruit and damaged food. But despite years of research, the receptor, neurotransmitter, and circuits for sour taste have only lately been discovered.

Since ancient times, it has been understood that one of the fundamental taste characteristics sensed by the tongue is sour, the flavor generated by lemons and other acids. However, it is unknown how sour taste transduction and information processing work.

Learn more about sour taste

https://brainly.com/question/9560396

A food that excites the taste receptors that allow positively charged hydrogen ions to enter cells is likely to have a sour taste.

The sour taste is one of the five basic tastes, along with sweet, salty, bitter, and umami. Sourness is perceived when positively charged hydrogen ions (H+) enter the taste receptor cells in the mouth, leading to an electrical signal that is transmitted to the brain. The sour taste is often associated with acidic substances, such as lemon juice or vinegar, which have a low pH and a high concentration of hydrogen ions.

The sour taste helps to detect the acidity of foods, which can be an indicator of spoilage. In general, sourness is an important sensory cue that helps to regulate food intake and maintain acid-base balance in the body. For example, sourness may stimulate saliva production, which can help to neutralize acids in the mouth and protect the teeth.

In conclusion, sour taste is the result of the detection of positively charged hydrogen ions (H+) by taste receptor cells, leading to an electrical signal that is transmitted to the brain. The sour taste is an important sensory cue that helps to detect acidity and regulate food intake.

Learn more about receptors here:

https://brainly.com/question/29343237

#SPJ4

Answer:

The net force is 0

Explanation:

because both people on either side are pulling the rope with the same force

Answer:

They have different DNA and different physical appearance

Explanation:

Because if the sperms fertilize two different eggs the DNA will be different too and if the sperms are different the physical appearance will be different also

The maximum volume of carbon dioxide that can be formed at RTP would be 0.48 L.

Sodium carbonate reacts with hydrochloric acid according to the following balanced equation:

\(Na_2CO_3 + 2HCl -- > 2NaCl + H_2O + CO_2\)

The mole ratio of the sodium carbonate that reacts to the carbon dioxide that is produced is 1:1. Thus 0.020 mol of sodium carbonate will be equivalent to 0.020 mol of carbon dioxide.

At room temperature and pressure (RTP), 1 mole of gas is equivalent to 24 L of gas.

Thus, 0.020 mol carbon dioxide would be equivalent to:

0.020 x 24 = 0.48 L

In other words, the maximum volume of carbon dioxide that can be produced from the reaction at RTP is 0.48 L.

More on stoichiometric problems can be found here: https://brainly.com/question/23742235

#SPJ1

Answer: Ca, Mg, S, Cl

Explanation: general trends are IE increases as the number of electrons in the outermost shell, and decreases as the number of shells (and shielding effect) increases.

S outer 6, shells 3

Ca outer 2, shells 4

Mg outer 2, shells 3

Cl outer 7, shells 3

Ca has 2 outer, 4 shells —> lowest

others have 3shells

Mg 2outer, S 6, Cl 7

The amount in grams is the 6 mmol of the magnesium is  0.145 g.

The mmol of the magnesium = 6 mmol

1 mmol = 0.001 mol

The 6 mmol = 0.006 mol

The molar mass of the magnesium = 24.30 g/mol

The number of the moles = mass / molar mass

Where,

The Moles = 0.006 mol

The molar mass magnesium =  24.30 g/mol

The number of the moles = mass / molar mass

The mass of the magnesium = 0.006 / 24.30

The mass of the magnesium  = 0.145 g

Thus, the grams of the magnesium is 0.145 g in the 6 mmol of the magnesium.

To learn more about moles here

https://brainly.com/question/26416088

#SPJ4

Answer:

0.96

Explanation:

Number of moles of Fe(III) = 3/1000 *  0.002 M = 6 * 10^-6 moles

Number of moles of SSA = 7/1000 * 0.02 = 1.4 * 10^-4 moles

Total number of moles =  6 * 10^-6 moles +  1.4 * 10^-4 moles

Mole fraction of SSA = number of moles of SSA/ total number of moles.

Mole fraction of SSA =  1.4 * 10^-4 moles/  6 * 10^-6 moles +  1.4 * 10^-4 moles

Mole fraction of SSA = 0.96

Answer:

See the answer below

Explanation:

Since no fresh air is coming into the elevator while the people are still trapped in it, the breathing of the people will alter the composition of the air inside the lift.

Breathing involves taking-in of oxygen and the release of carbon dioxide. Hence, less and less oxygen will become available within the lift while the concentration of the carbon dioxide keeps increasing as time goes on.

If the people remain trapped for a long time, the oxygen composition of the air inside the elevator will become exhausted, the carbon dioxide concentration will increase, and the people will suffocate due to lack of oxygen.

Two properties of metal is High Electrical Conductivity and Ductility.

What is Electric Current?

High Electrical Conductivity: Metals have a high electrical conductivity, which means that they allow electricity to flow through them with ease. This makes them ideal for use in electric wires, where the current needs to flow smoothly and without interruption.

Ductility: Metals are ductile, which means they can be drawn into thin wires without breaking. This property is important for electric wires, as they need to be thin and flexible enough to be easily installed in homes and buildings.

Electric current refers to the flow of electric charge through a material. It is the rate at which electric charge flows through a conductor, measured in amperes (A). Electric current is typically carried by electrons in metals and ions in electrolytes. When a voltage difference is applied across a conductor, such as a wire, it creates an electric field that drives the movement of electric charges.

Learn more about Electric Current from the given link

https://brainly.com/question/1220936

#SPJ1

The equilibrium constant of a reaction requires certain environmental variables to remain constant. These variables are pressure, temperature, and concentration. The correct option is A.

An equilibrium constant is a mathematical tool that enables the quantification of the extent of a chemical reaction. The equilibrium constant is symbolized by Keq, and it is utilized to determine the concentration of reactants and products present at equilibrium.

                           This calculation is done using the law of mass action.Keq is defined as the ratio of product concentrations to reactant concentrations in a chemical reaction taking place at equilibrium. The concentrations used in the expression for Keq are equilibrium concentrations.

                                 As a result, Keq is a constant for a given reaction at a specific temperature. Keq is dependent on a variety of environmental variables such as temperature, pressure, and concentration. To keep the equilibrium constant stable, these variables must remain constant.

Learn more about equilibrium constant

brainly.com/question/28559466

#SPJ11

Answer:

SEi the answer is he need some milk and meta and cuCUMbers

Explanation:

Answer:

zince hypohlorite

Explanation:

Answer:

Zince Hypohlorite

A redox reaction is a chemical reaction in which one or more of the reacting species undergoes oxidation and one or more undergoes reduction. An oxidizing agent is an element or compound that oxidizes another substance, while a reducing agent is an element or compound that reduces another substance.

For such more question on oxidizes

https://brainly.com/question/14041413

#SPJ8

in this question, we are given with the pressure at initial point i.e. 15 psi that undergoes compression from 470ml of volume to 260 ml.

We are asked to determine the final pressure after the compression.

For that we'd consider the Boyle's law that states that, for a gas in an iso-thermic system Pressure is inversely proportional to the Volume.

which means with the increase in Pressure, Volume of gas will reduce.

At constant Temperature, product of Pressure and Volume will be constant.

PV =  constant.

for same system at different pressure volume condition, we can say that-

\(P_{1}V_{1} = P_{2}V_{2}\)

\(P_{1} = 15psi\\ V_{1} = 470ml\\ V_{2} = 260ml\)

(15)(470) / (260) = \(P_{2}\)

Final Pressure = 27.11 psi

To know more about Boyle's law:

brainly.com/question/1437490

#SPJ4

After a while at room temperature, a piece of dry ice, or solid CO2, vanishes without leaving a puddle of liquid behind.

Dry ice, which is a solid form of carbon dioxide, is available. When used for short-term refrigeration, CO2 is usually used because it frequently sublimates from the solid form to the gas state due to the fact that it does not have a liquid state at normal atmospheric pressure. Carbon dioxide that is solid is known as "dry ice." Due to its ice-like appearance and the fact that it truly sublimes rather than melting, dry ice appears to be made of ice. Because the solid does not first become a liquid when heated, it is known as dry ice.

Dry ice, also known as solid carbon dioxide, is very cold (109 °F / 78 °C), and it is frequently used to cool vaccines, chill and freeze food, preserve blood and tissue samples, heat-treat metals, and even produce special effects like fog for events or stage plays. Because solid CO2 does not melt into a liquid when heated but instead transforms instantly into gas, it is referred to as dry ice. Sublimation is the name of this procedure.

To know more about Solid CO2 visit:

https://brainly.com/question/2726615

#SPJ4

The atomic or hybrid orbitals that make up the sigma bond between C1 and O1 in acetic acid, and CH3COOH are the hybrid sp3 orbitals. The approximate C2-C1-O1 bond angle is about 120 degrees.

Hybrid orbitals are orbitals produced from the hybridization of atomic orbitals. Hybridization occurs when valence electrons of an atom mix into new atomic orbitals. The new orbitals have shapes and properties that are distinct from the original atomic orbitals.Hybrid orbitals arise in the process of chemical bonding. Hybrid orbitals are used to create bonds that are stronger than those created by the use of atomic orbitals. Hybrid orbitals come in different types including sp3, sp2, and sp orbitals. A sigma bond is a type of covalent bond in which two atoms come together and share a pair of electrons. A sigma bond is a strong bond that is formed through the overlap of atomic or hybrid orbitals. A sigma bond is represented using the symbol σ. It is a type of single bond. The approximate C2-C1-O1 bond angle is about 120 degrees. The C2-C1-O1 bond angle is a measure of the degree of deviation from the linear arrangement of the three atoms in the molecule. The bond angle depends on the types of atoms, the number of electron pairs, and the repulsion between electron pairs in the molecule.

Learn more about hybrid orbitals at  brainly.com/question/24195443

#SPJ11

The ionic bond between Na and P has formula unit Na3P.

What is the formula unit?

Formula units is the chemical formula which gives all the ions present in the lowest ratio possible to make it neutral charge of an ionic compound. For example, the formula unit for sodium chloride can be written as NaCl where charge on Na is +1 and charge on Cl is -1. So to make it neutral they can be cancelled and written as NaCl.

In sodium phosphide, the charge on Na (sodium) ion is +1 and the charge on the P (phosphorous) ion is -3. Therefore, make the charges neutral, 3 Na ions need to be added to 1 P ion. Formula units can be used to describe or represent the molecules or the elements which make up a substance.

Hence, Na3P is the formula unit of Na and P in sodium phosphide.

To learn more about formula units from the given link https://brainly.com/question/24529075

#SPJ13

Answer:

Increasing the solute

Explanation:

The simplest way to change the concentration would be to change the amount of solute or solvent in the solution. Increasing the solute would increase the concentration. Increasing the solvent would decrease the concentration. For instance, if your lemonade was too tart, you would add more water to decrease the concentration.