Please help me determine the pH for these solutions:[H+]=6.27x10^-7MAnd[OH-]=3.4x10^-13

Answer:

The final pressure is 90.1 atm.

Explanation:

Assuming constant temperature, we can solve this problem by using Boyle's Law, which states:

Where in this case:

We input the given data:

And solve for P₂:

The final pressure is 90.1 atm.

The reaction that would most likely require the use of an inert electrode is a reaction involving highly reactive substances or species that can react with or be oxidized by the electrode material itself.

One such reaction that often requires the use of an inert electrode is the electrolysis of aqueous solutions containing halide ions (Cl-, Br-, I-). When halide ions are electrolyzed, they can undergo oxidation at the anode, resulting in the formation of halogen gas (Cl2, Br2, I2). However, these halogens are highly reactive and can react with many common electrode materials, such as metals, leading to unwanted side reactions.

To prevent these undesired reactions, an inert electrode, usually made of materials such as platinum, gold, or graphite, is employed. Inert electrodes do not react with the halogen gases formed during electrolysis, allowing the desired reaction to take place without interference from the electrode material itself.

For example, in the electrolysis of a sodium chloride (NaCl) solution, chloride ions (Cl-) can be oxidized at the anode to form chlorine gas (Cl2). To ensure that the chlorine gas is produced without any reactions involving the anode material, an inert electrode like platinum or graphite is used.

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The molality of the magnesium chloride solution dissolved in 500g of water is 1m.

Molality is the concentration of a substance in solution, expressed as the number of moles of solute per kilogram of solvent.

The molality of a solution can be calculated by dividing the number of moles of solute by the mass (in kilograms) of solvent as follows:

molality = no. of moles/mass

According to this question, 48 grams of MgCl2 dissolved in 500g of water. 48 grams of magnesium chloride is equivalent to 0.5041 moles. 500 g of water is equal to 0.5kg.

molality = 0.5041 mol / 0.5kg

molality = 1m

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Answer:

A.

Explanation:

Energy cannot be created OR destroyed. It is only transferred from place to place.

Answer:

The answer is c. ( mutualistic ).

Explanation:

The relationship between cotton plants and wasps is an example of mutualism. The cotton plants provide a food source in the form of nectar for the wasps, and in return, the wasps serve as pollinators for the cotton plants, which helps the plants reproduce. This is a mutually beneficial relationship, as both species benefit from the interaction. Therefore, the answer is (c) mutualistic.

If this helps, please mark my answer as brainliest so I can get better rank:) thank you

The calculated formula masses to 133.5 amu, we find that the substance with a formula mass closest to 133.5 amu is (d) AlCl3. Therefore, the answer is option D.

To identify the substance with a formula mass of 133.5 amu, we need to calculate the formula mass of each given substance and compare it to 133.5 amu.

(a) MgCl2:

The formula mass of MgCl2 can be calculated by adding the atomic masses of magnesium (Mg) and chlorine (Cl).

Mg: atomic mass = 24.31 amu

Cl: atomic mass = 35.45 amu

Formula mass of MgCl2 = (24.31 amu) + 2(35.45 amu) = 95.21 amu

(b) SCl:

The formula mass of SCl can be calculated by adding the atomic masses of sulfur (S) and chlorine (Cl).

S: atomic mass = 32.07 amu

Cl: atomic mass = 35.45 amu

Formula mass of SCl = 32.07 amu + 35.45 amu = 67.52 amu

(c) BCl:

The formula mass of BCl can be calculated by adding the atomic mass of boron (B) and chlorine (Cl).

B: atomic mass = 10.81 amu

Cl: atomic mass = 35.45 amu

Formula mass of BCl = 10.81 amu + 35.45 amu = 46.26 amu

(d) AlCl3:

The formula mass of AlCl3 can be calculated by adding the atomic mass of aluminum (Al) and 3 times the atomic mass of chlorine (Cl).

Al: atomic mass = 26.98 amu

Cl: atomic mass = 35.45 amu

Formula mass of AlCl3 = 26.98 amu + 3(35.45 amu) = 133.78 amu. Option D

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The appropriate types of chromatography for the labels are:

Fm>2000, octane soluble, size 10 nm: Bonded normal phase

Fm>2000,  butanol soluble, size 100 nm: Bonded normal phase

Fm>2000, water soluble, non-ionic, size 10 nm: Adsorption

Fm<2000,  ethanol soluble: Bonded reverse phase

Fm<2000, water soluble, ion paired: Ion exchange

Fm<2000, water soluble, ionic: Ion exchange

Liquid chromatography is a separation technique that uses  liquid stationary and mobile phases to separate and purify compounds. There are many different types of liquid chromatography, each with different stationary phases and separation mechanisms.

In ion-exchange chromatography, the stationary phase consists of ionizable groups that interact with ions in the mobile phase. This type of chromatography is used to separate charged molecules such as ions and ion-pair compounds.

In adsorption chromatography, the stationary phase consists of solid adsorbents like Silica or alumina that interacts with the analyte via van der Waals forces, dipole-dipole interactions, or hydrogen bonding. This type of chromatography is used to separate compounds based on their affinity for the stationary phase.

In normal-phase chromatography, the stationary phase is a non-polar material such as silica or alumina, and the mobile phase is a polar solvent such as water or methanol. This type of chromatography is used to separate non-polar compounds based on their affinity for the stationary phase.

In reversed-phase chromatography, the stationary phase is a polar material such as octadecyl silica or cyanide-bonded silica, and the mobile phase is a non-polar solvent such as hexane or methylene chloride. This type of chromatography is used to separate polar compounds based on their affinity with the stationary phase.

Molecular exclusion chromatography, also called size exclusion chromatography, is a type of chromatography that separates molecules based on their size. The stationary phase consists of porous spheres with different pore sizes, and molecules are separated based on their ability to penetrate the pores. This type of chromatography is used to separate molecules with molecular weights greater than 2,000 Daltons.

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Answer:

3 Covalent Bonds and 1 Co ordinate Bond

Explanation:

4 bonds are in NH4¹+

NH4¹+ is the ammonium ion, which consists of a central nitrogen atom (N) and four hydrogen atoms (H). Nitrogen is located in group 15 of the periodic table and has 5 valence electrons. Hydrogen, on the other hand, has 1 valence electron.

To achieve a stable electron configuration, nitrogen needs to share electrons with the hydrogen atoms. Each hydrogen atom can form a single bond with the nitrogen atom by sharing its valence electron.

In NH4¹+, all four hydrogen atoms form single bonds with the central nitrogen atom. These bonds are represented by lines connecting each hydrogen atom to the nitrogen atom.

So, NH4¹+ has 4 bonds. Each bond represents a pair of electrons shared between the nitrogen atom and a hydrogen atom. The bonding arrangement ensures that the nitrogen atom has a complete octet (eight valence electrons) and each hydrogen atom has two electrons, following the stable configuration of helium.

The "+1" charge on NH4¹+ indicates that the ion has lost one electron, resulting in a positive charge. However, the number of bonds remains the same regardless of the charge.

Therefore, the correct answer is 4 for the number of bonds in NH4¹+.

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Cyclopropane is a group of answer choice a. chemically very reactive.

Cyclopropane is a cyclic alkane that consists of three carbon atoms bonded to each other to form a ring. Each carbon atom is bonded to two hydrogen atoms, giving the molecule the formula C3H6.

Cyclopropane is known to be chemically very reactive due to the presence of high ring strain in the molecule.

The bond angles in cyclopropane are 60°, which is much smaller than the ideal tetrahedral bond angle of 109.5°. This causes the bonds to be weaker and more reactive than those in other alkanes.

As a result, cyclopropane undergoes a variety of reactions, including ring-opening reactions and addition reactions with electrophiles.

It is also more prone to undergo combustion reactions than other alkanes. Overall, the high reactivity of cyclopropane makes it an important molecule in organic chemistry and a useful starting material for the synthesis of other compounds.

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To graph the function g(x) = f(-x), you can start with the graph of f(x) and then reflect it about the y-axis.

To find the graph of the function g(x) = f(-x), we can start with the graph of the function f(x) and then reflect it about the y-axis.

If the graph of f(x) is symmetric with respect to the y-axis, meaning it is unchanged when reflected, then g(x) = f(-x) will have the same graph as f(x).

However, if the graph of f(x) is not symmetric with respect to the y-axis, then g(x) = f(-x) will be a reflection of f(x) about the y-axis.

In either case, the resulting graph of g(x) = f(-x) will be symmetric with respect to the y-axis.

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The possible effects of this condition on the family is adverse because they can't do fishing due to eruption.

Aquatic life can be affected due to volcanic eruption due to increase in acidity, change in temperature, and change in food supply. These factors can damage and also kill fish so this eruption has adverse effect on the family's economic condition and my advice is to them to change their place of living and settle in other unaffected area.

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Digital road maps are different from paper and road maps in that they allow users to plan routes before a trip, they can be used anywhere in the world, and they can be updated almost immediately. They also show both major and minor roads in a region.

Digital road maps are a type of digital map that is based on GIS data. This data is collected from various sources and is used to create a detailed representation of the real world.  The digital road map allows the user to zoom in and out and to see different levels of detail, depending on their needs. They also allow the user to search for specific locations, find directions, and plan routes before they begin their trip.

On the other hand, paper maps are usually printed on paper and can be difficult to read in low light conditions. They are also limited in the amount of detail that they can show, and they may not always be up-to-date.

Road maps, on the other hand, are a type of map that shows roads and highways in a region. They may include some additional features such as rest areas, gas stations, and other points of interest. Road maps are typically printed on paper and are often used for navigation while driving. They are not as detailed as digital road maps, and they can quickly become outdated as new roads are built.

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Answer:

Lithosphere, Hydrosphere, atmosphere

The set of Earth components that is arranged in order from solid to liquid to gas is D. lithosphere, hydrosphere, atmosphere

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There are sixteen lone pairs in the molecule and two bond pairs in the molecule. The compound has a tetrahedral  electron geometry but the shape is bent. The compound is polar.

The compound that is under consideration is selenium dichloride. In this compound, we have one atom of selenium and then two atoms of chlorine. The accurate and correct Lewis structure of the compound have been shown in the image that is attached to this answer.

In that structure, we can see the number of valence electrons that can be found in the compound and some of the electrons are lone pairs while the other valence electrons can be seen to be bond pairs.

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Answer:

B

Explanation:

as temperature rises, the particles gain kinetic energy (they will move faster) so if temperatures stays constant, so will the movement or vibration of the particles

There are 91.84L of a 0.200 M sodium cyanide solution would be needed to react with 45.0kg of rocks that contain 2.00% by mass of gold

The formula for % w/w is mass of solute /mass of solution*100

Substituting the values in the equation

2%= mass of solute/45000 *100

mass of solute= 2*45000/100

mass of solute = 900 gram

Now, to calculate the volume we use the molarity given

molecular weight of sodium cyanide is 49 g/mol

Molarity= mass of solute/molecular mass *volume

0.2=900/49* volume

volume= 900/49*0.2

volume= 91.84 liter

The mass percentage of a solute in solution is the percent concentration of a substance (solute) in solution when it is stated as 'w/w'. This phrase is frequently used when the solute and solution are weighted.

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Answer: Neils Bohr

Explanation: Development of the Atomic Theory. In 1913, Neils Bohr, a student of Rutherford 's, developed a new model of the atom. He proposed that electrons are arranged in concentric circular orbits around the nucleus. This model is patterned on the solar system and is known as the planetary model.

Answer:

translation to English please

Explanation:

Answer:

You must add 53,295 J.

Explanation:

Calorimetry is the measure of the amount of heat that a body gives up or absorbs in the course of a physical or chemical process.

When the heat added or removed from a substance causes a change in temperature in it, it is called sensible heat. In other words, sensible heat is the amount of heat absorbed or released by a substance when a change in temperature occurs, without a change in its state.  Its mathematical expression is:

Q = c * m * ΔT

where Q is the heat exchanged by a body of mass m, constituted by a substance of specific heat c and where ΔT is the variation in temperature.

In this case:

Replacing:

\(Q= 4.18\frac{J}{g*C}*150 g*85 C\)

Solving:

Q= 53,295 J

You must add 53,295 J.

Answer:

The pulling atom is oxidized while the pulled atom is reduced. Grade 9 Chemistry

Explanation:

Answer:

A nivel microscópico y en el marco de la Teoría cinética, es el total de la energía cinética media presente como el resultado de los movimientos aleatorios de átomos y moléculas o agitación térmica, que desaparecen en el acto.

Explanation:

esoes

Answer:

lungs

Explanation:

Answer:3.6 X 10-4 g

Explanation:

2.7 X 10^18 X (1 mole / (6.02 X 10^23) X ( 80.912 g / 1 mole) = 3.629 X 10-4 g HBr.  If needed to correct Sig Figs 3.6 X 10-4 g HBr

Covalent and ionic bonds refer to atoms joined by their electrons. In covalent bonds, electrons are shared by the involved non-metal atoms. Option 2 is correct. Occurs due to the sharing of electrons between two non-metal atoms.

Both of them, covalent and ionic bonds, are chemical bonds that can form between atoms.

Ionic bonds occur between atoms with different electronegativity. When they bind, they transfer electrons from one atom to the other creating ions with opposite charges that attract each other.

Ionic compounds are formed by anions and cations.

• Cations are positive ions derivated from metals.

• Anions are negative ions derivated from non-metals.

The metal atoms share its electrons with the non-metal ones, creating stable configurations. Ionic bonds do not create molecules.

Covalent bonds are formed between atoms share electrons to be more stable. Atoms involved share electrons equally, creating a strong bond between them.

Covalent bonds are usually formed between non-metal atoms.

Option 2 is correct. Occurs due to the sharing of electrons between two non-metal atoms

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Complete question

A template of a Venn diagram representing common and differentiating characteristics of covalent and ionic bonds is shown.

Which of the following characteristics can be written only in space C?

On the diagram,

Options,

Explanation:

pure substances are those substances which are made up of one elements

mixture that those substances which are made by more than two or three elements

Answer:

Brainliest is appreciated

Explanation:

Substances which have a specific composition and cannot be separated into any constituents are called pure substances. Pure substances are further divided into elements and compounds. The combination of two or more pure substances is called a mixture. Mixtures can be classified into two types viz. heterogeneous and homogeneous mixtures. 

EXAMPLES

pure substance

gold, pure water, hydrogen gas

mixture substance

oil and water, sand and sugar

Answer:

a.

Explanation:

One double bond.

For example ethene CH2=CH2

Answer:

Genes are segments of deoxyribonucleic acid (DNA) that contain the code for a specific protein that functions in one or more types of cells in the body.

Chromosomes are structures within cells that contain a person's genes. A trait is any gene-determined characteristics and is often determined by more than one gene.

for study island:

A single trait can be controlled by multiple genes.

A single gene can influence multiple traits.

Answer:

I think thats its (b) can you brainllest me asap

Explanation:

We have that  It made no reference to  the nucleus of the atom

Correct option B

It did not account for the nucleus of the atom

From the question we are told

What was a major flaw in J.J. Thomson's plum pudding (chocolate chip cookie) model?

Question 6 options:  

A) It did not account for the mass of the atom.  

B) It did not account for the nucleus of the atom.

C) It did not contain any positively charged particles.

D) It did not contain any negatively charged particles.

Generally

J.J. Thomson's plum pudding (chocolate chip cookie) model is a Model that saw the atom as containing only Positively and negatively charged particles

Therefore

It made no reference to  the nucleus of the atom

Correct option B

It did not account for the nucleus of the atom.

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