What is the pH of a solution that is 0. 17M HA and 0. 50M A-.  Ka HA=2. 87x10-9​

Answer: It supplies water to nearly half of US households.

The technical term for a substance made out of two or more elements is mineral. The correct option is D.

A mineral is an inorganic, naturally occurring substance with a crystalline structure and a particular chemical make up. Two or more chemical elements that are bonded together in a particular way make up minerals. Quartz, feldspar and mica are a few examples of common minerals.  Due to their distinctive qualities, minerals are frequently used in industry and technology. Some minerals also have economic value.

Contrarily, an element is a substance that cannot be chemically divided into less complex ones. The quantity of protons in an element's atomic nucleus determines its identity. Oxygen, carbon and gold are a few examples of elements. The correct option is D.

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Answer:

It goes the crust mantle outer core and inner core. The crust is what we are standing on it has dirt, rock, stone, the mantle it has lots of silicate rocks and magnesium. The outer core has liquid nickel and iron and the inner core has solid metals

Mantle and core layers are present underneath Earth's surface.

The land underneath Earth's surface has mantle, outer core and inner core. The surface of the earth is the crust which is solid and hard. This surface of earth becomes hard due to cooling of the surface with the help of environmental conditions.

Mantle layer of earth has high temperature than crust whereas the inner and outer core is more hotter than mantle where all the materials are present in liquid state so we can say that inside the earth mantle and core layers are present.

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The valence shell of carbon contains four electrons. Each of these electrons are shared with a hydrogen atom. Consequently, the carbon and hydrogen atoms in the methane (CH4) molecule share four electron pairs.

The CH4 molecule does not contain an unshared pair of electrons.Due to the fact that carbon has a valence of 4, it can only make a maximum of 4 bonds with other atoms. Since the hydrogen only has one electron, it can only create one bond. Here, one electron from each hydrogen atom and each of the four valence electrons of carbon are shared, generating four sigma covalent connections. As a result, all of the valence electrons on carbon and hydrogen participate in the creation of the bond and no unshared pair of electrons is left.

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Since the initial concentration of "q" is equal to the initial concentration of "r", and the equilibrium constant, Kc, is 25, the reaction will proceed in the direction that generates more "r", until the concentration of "q" and "r" reach an equilibrium state.

The direction of a chemical reaction is determined by the relative concentrations of the reactants and products, which is described by the equilibrium constant, Kc. If the initial concentration of reactant "q" is equal to the initial concentration of product "r", the reaction will proceed in the direction that leads to an increase in the concentration of the species with the lower concentration, until the concentration of "q" and "r" reach an equilibrium state.

In this case, if 50 μM of "q" is mixed with 50 μM of "r", the initial concentration of "q" and "r" are equal, so the reaction will proceed in the direction that leads to an increase in the concentration of the species with the lower concentration. To determine the direction of the reaction, we can use the equation for the equilibrium constant, Kc:

Kc = [r]/[q]

If [r] > [q], then Kc > 25 and the reaction will proceed in the direction of generating more "q" to reach an equilibrium state.

If [r] < [q], then Kc < 25 and the reaction will proceed in the direction of generating more "r" to reach an equilibrium state.

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Answer:

An alkaline solution can be formed when a metal oxide is dissolved in water. An acidic solution can be formed when a non-metal oxide is dissolved in water. For example, magnesium oxide dissolves to form alkaline solutions.

Answer

We are currently working on a dataset of war and large-scale violent events over the long run. If you want to contribute to this research please get in touch.

Explanation:

The matter cannot be created or destroyed in a chemical reaction. So that answer is No

According to the law of conservation of mass, matter can neither be created nor destroyed in a chemical reaction. The total mass of the reactants must be equal to the total mass of the products, meaning that atoms are rearranged and combined in different ways, but no atoms are lost or gained.

The law of conservation of mass is a fundamental principle in chemistry, and it highlights the notion that matter is conserved throughout chemical reactions. This understanding allows chemists to accurately predict and balance chemical equations, ensuring that the total number of atoms on each side of the reaction remains constant.

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Answer:

D is the correct answer acidity

Explanation:

pH is the logarithmic measurement of the H3O+-concentration in water solutions.

By definition: pH = -log[H3O+]

Example: [H3O+] = 1.0*10-7 mol/L in neutral, pure water (at 25oC), so

pH = -log(H3O+) = -log(1.0*10-7) = 7.0

In the evaluation of the measurement tools, the following terms must be differentiated: validity, reliability, and practicality.

Validity refers to how accurately a tool measures what it is supposed to measure. A measurement tool is considered to be valid if it measures what it is supposed to measure. Validity can be classified into three types: content, criterion, and construct. Content validity refers to whether the measurement tool captures all aspects of the phenomenon being measured. Criterion validity refers to whether the measurement tool correlates with a known standard of measurement. Construct validity refers to whether the measurement tool measures the theoretical concept it claims to measure. Reliability refers to the consistency of a measurement tool's results. A measurement tool is reliable if it consistently measures what it is supposed to measure. Reliability can be classified into three types: test-retest, inter-rater, and internal consistency.

Test-retest reliability refers to whether the measurement tool produces consistent results when given to the same individuals at different times. Inter-rater reliability refers to whether the measurement tool produces consistent results when given to different raters. Internal consistency refers to whether the measurement tool produces consistent results across different parts of the same test. Practicality refers to how easy a measurement tool is to administer and score. A measurement tool is considered practical if it is easy to administer and score. For example, a 100-item questionnaire may be impractical to use in a clinical setting where time is limited. In conclusion, validity, reliability, and practicality are important factors to consider when evaluating measurement tools.

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The reaction will produce 6.61 mole of magnesium oxide.

What is the purpose of magnesium oxide?

There are several uses for magnesium oxide. Some people use it as an antacid to treat acid indigestion, digestive problems, and heartburn. Magnesium oxide can also be used as a laxative to quickly and temporarily empty the bowels (before surgery, for example).

Briefing:

This clearly demonstrates that 100.95g magnesium nitride reacts with 108.06g of water to give stoichiometric ammonia and magnesium oxide.

moles of Mg3N2 = 3.82g /100.95g per mole =0.0387 mole

mole of OH2 = 7.73g/18.01g per mole

magnesium oxide, i.e. 0.0387 mole × 58.32g per mole= 6.61mole

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A graph enables you to easily denote the relationship between variables as positive or negative.

This question is incomplete but I will try to help you as much as I can. A graph is one of the numerous was of data representation in science. A graph has two axes; the vertical ( Y - axis) and the horizontal (X - axis).

A graph enables you to easily denote the relationship between variables as positive or negative. A graph is sometimes called a scatter plot.

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Answer:

Hydrogen bonds

Explanation:

The weak attractive forces that hold water molecules together are called hydrogen bonds.

Answer:

The nucleus in eukaryotes and the cytoplasm in prokaryotes

Explanation:

The nucleus is the largest organ in a eukaryotic cell which is responsible for the control of the cell activities based on processing of received information and cell administration. The nucleus is therefore, known as the cell cell control center for regulating the metabolism of the cell and administers the cell and cellular information with which proteins are made

The nucleus contains nucleolus and it is the store for the chromosomes, which play an important role in genetics, related to the synthesis and replication of DNA and RNA

The functions of the nucleus are spread out through out the cytoplasm of prokaryotes.

Answer:  Molecular Formula is C5H5

Explanation:   M(CH) = 13.018 g/mol

 Empirical formula of compound is (CH)x in which x = 2,3,4,...

   Molar mass of the substance is 65 g.   x = 65 g/mol : 13 g/mol = 5

Try 35% ethyl acetate to see the substance present in it is more polar ,which on increasing the concentration of ethyl acetate to give a second spot.

The acetate ester produced when acetic acid and ethanol react is termed as ethyl acetate. It functions as an EC 3.4.19.3 (pyro glutamyl-peptidase I) regulator, a metabolite, and a Saccharomyces cerevisiae metabolite in addition to being a polar aprotic solvent. It is a volatile organic chemical, an ethyl ester, and an acetate ester.

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The complete question is :

You use 25% ethyl acetate (an ester) in hexane to run a tlc and obtain a single round spot with an Rf of 0.9 for the main compound. What would you do?

2.385 grams of Vitamin C must be weighed out for the experiment.

Given:

Volume of Vitamin C solution needed (V) = 250.00 mL

Molarity of Vitamin C solution (M) = 9.54 x 10⁻³ M

Amount of Vitamin C to be calculated (n)Formula used to calculate amount of solute (n) = M × V

Amount of Vitamin C (n) = 9.54 x 10⁻³ M × 250.00 mL = 2.385 g (to 4 sig. figs.)

Therefore, 2.385 grams of Vitamin C must be weighed out for the experiment.

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The molarity of the solution is 1.43M.

What is molarity?

Molarity is a unit used to measure the concentration of a solute in a solution. It is expressed as the number of moles of the solute in one liter of the solution. Molarity is defined as the number of moles of solute per liter of the solution. When a solution is formed by dissolving a solute in a solvent, the concentration of that solution is typically expressed as its molarity. Molarity is an important concept in chemistry as it is used to calculate the amount of a solute needed to prepare a solution of a specific concentration. It can also be used to calculate the amount of a reactant to be added in a reaction. Knowing the molarity of a solution is therefore essential in many chemical processes.

Density = 1.02 g/mL i.e. Mass of 1L of NaCl  = 1020g

7.74% aqueous solution of NaCl means 100g of solution contains 7.74g of NaCl i.e. 7.74/58.44 mol of NaCl [molar mass of NaCl = 58.44g/mol]

Hence ,in 1020g of solution ,amount of NaCl = (7.74/58.44)×1020/100 mol = 1.3464 mol

1020g of solution contains (1020-1020×7.74/100)g =   941.052 g of H2O

Hence , 1000g of H2O contains

(1.3464/941.052)× 1000 mol of NaCl = 1.43M

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Answer:

Gas exchange takes place in the millions of alveoli in the lungs.

Explanation:

Gas exchange takes place in the millions of alveoli in the lungs and the capillaries that envelop them. As shown below, inhaled oxygen moves from the alveoli to the blood in the capillaries, and carbon dioxide moves from the blood in the capillaries to the air in the alveoli.

Answer:

The correct answer is - due to the movement of plates it is relocated.

Explanation:

Antarctica is a very cold part of the earth, it is so cold that there is no growth of trees or such vegetation. Even though there are no or less vegetation scientists found fossils of the trees.

It is relocated from the north where the conditions were warmer and easy for tree growth. It is then moved due to plate movements to the south pole. This is the reason behind the fossils scientist found.

One of the regulating services provided by the ecosystem is pollination. Option B.

Ecosystem services are natural processes that are maintained by the ecosystem but which benefit man and mankind.

There are different types of services offered by the ecosystem and that benefit man immensely. These are:

The ecosystem plays a regulatory role in the pollination of plants for the benefit of mankind. Wind helps to carry pollens from the anther to the stigma of flowers. By doing so, fruits, vegetables, seeds, etc, become available for the use of man.

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The mass of ammonia that would be produced is 312.5 g

First, we will write a balanced chemical equation for the reaction

The balanced chemical equation for the reaction is

3H₂(g) + N₂(g) → 2NH₃(g)

This means

3 moles of hydrogen gas reacts with 1 mole of nitrogen gas to produce 2 moles of ammonia.

First, we will determine the number of moles of each reactant present

For Hydrogen (H₂)

Mass = 83.6 g

Molar mass = 2.016 g/mol

Using the formula

\(Number\ of\ moles = \frac{Mass}{Molar\ mass}\)

Number of moles of H₂ present = \(\frac{83.6}{2.016}\)

∴ Number of moles of H₂ present = 41.468254 moles

For Nitrogen (N₂)

Mass = 257 grams

Molar mass = 28.0134 g/mol

∴ Number of moles of N₂ present = \(\frac{257}{28.0134}\)

Number of moles of N₂ present = 9.174181 moles

Since,

3 moles of hydrogen gas reacts with 1 mole of nitrogen gas to produce 2 moles of ammonia

Then,

27.522543 moles of hydrogen gas will react with the 9.174181 moles of nitrogen gas to produce 18.348362 moles of ammonia

∴ 18.348362 moles of ammonia will be produced during the reaction

Now, for the mass of ammonia that would be produced

From the formula

Mass = Number of moles × Molar mass

Molar mass of ammonia = 17.031 g/mol

Mass of ammonia that would be produced = 18.348362 × 17.031

Mass of ammonia that would be produced = 312.49095 g

Mass of ammonia that would be produced ≅ 312.5 g

Hence, the mass of ammonia that would be produced is 312.5 g

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Answer: 19.4

Explanation: Acellus

Answer:

The answer is B

Explanation:

A pipe to the ground

The reaction has reached its equivalence point once it is complete.

To determine if the reaction has reached its equivalence point once the reaction is complete, we must first calculate the moles of each compound:

HCl moles = 1.0 M x (10.0 mL / 1000 mL/L) = 0.01 mol

NaOH moles = 2.0 M x (5.0 mL / 1000 mL/L) = 0.01 mol

The two compounds react in a 1:1 ratio.

There are now no more moles of HCl or NaOH left to react since they have equal moles.

We can thus conclude that the reaction has reached its equivalence point as soon as the reaction is over. Since the moles of both HCl and NaOH have been completely neutralized, the pH at the equivalence point is 7.

This indicates that the reaction has reached its equivalence point once it has finished.

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Answer:

Option C

Explanation: Pass me the brainliest I only need 1

The degree of solid solution solubility depends on several factors such as atomic radii of the solute and solvent atoms, crystal structures of solute and solvent, and valency of the solvent and solute atoms1. According to Hume-Rothery rules, maximum solubility occurs when the solvent and solute have the same valency1.

The determine the pair of atoms with the highest degree of solid solution solubility, I would need more information about the specific atoms or compounds you are referring to. Solubility depends on various factors such as atomic size, lattice structure, electronegativity, and chemical bonding. Please provide more information or details about the pairs of atoms you are considering, and I would be happy to help you determine the highest degree of solid solution solubility. Metals with lower valency will tend to dissolve metals with higher valency1. However, I’m afraid I don’t have enough information to determine which pair of atoms have the highest degree of solid solution solubility.

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