You are asked to make a 1. 5 L solution of. 35 M HCl by diluting concentrated 16. 0 M HCI. What


volume of acid would be needed to make the dilution?

With the aid of a transport molecule, chemicals can be transported across a biological membrane from a region of higher concentration to an area of lower concentration.

The process of spontaneous passive transport of molecules or ions across a biological membrane by certain transmembrane integral proteins is known as facilitated diffusion. It is sometimes referred to as facilitated transport or passive-mediated transport.

The passage of certain chemicals through protein channels to traverse cell membranes. It is a sort of passive transport, thus it is not quite diffusion. proteins for transport. proteins that assist in moving materials across cell membranes and throughout the body.

Facilitated diffusion is demonstrated by the movement of amino acids and glucose into cells from the circulation. These molecules are ingested by active transport in the small intestine and subsequently released into the circulation.

Thus, the chemicals can be transported across a biological membrane from a region of higher concentration to an area of lower concentration.

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Answer:

100g

Explanation:

The amount of sugar in the beaker still remains 100g. There is no addition or loss of any quantity of sugar unit.

Physical and chemical changes obey and complies with the law of conservation of matter.

The law suggests that matter is neither created nor destroyed but can be changed from one form to another.

Answer:

lol good luck

Explanation:

u need it

Answer:

A photon of green light has a higher energy since it has a higher frequency than the yellow photon. And we can see that on the picture representation of the light spectre.

The paired t-test yields a different conclusion than the normal t-test because it accounts for the paired nature of the data, comparing the measurements taken at the top and bottom of the lake separately.

In this scenario, the paired t-test is appropriate because it analyzes the data as pairs, considering the chloride levels measured at the top and bottom of the lake for each sample. By comparing the differences within each pair, the paired t-test determines whether there is a significant difference between the chloride levels at the top and bottom of the lake.

Using the paired t-test, the differences between the paired observations are calculated, and the null hypothesis assumes that the mean difference is zero (no significant difference between the top and bottom chloride levels). The test then determines whether the observed differences are statistically significant at a chosen confidence level, in this case, 95%.

The normal t-test for differences in means, on the other hand, would treat the top and bottom chloride levels as separate and unrelated groups, disregarding their paired nature. By pooling the data and conducting a standard t-test, the analysis assumes that the two sets of measurements are independent, which may not be appropriate in this case. This can lead to a different conclusion compared to the paired t-test.

The different conclusion drawn from using the paired t-test compared to pooling the data and using the normal t-test is due to the consideration of the paired nature of the measurements. The paired t-test takes into account the potential correlation or connection between the measurements taken at the same location (top and bottom of the lake) and assesses the differences within each pair.

Pooling the data and using the normal t-test treats the measurements as independent, disregarding the pairing. This can result in a loss of valuable information and may lead to an inaccurate conclusion. The paired t-test is more appropriate when dealing with dependent or related measurements, ensuring a more accurate assessment of the differences between the top and bottom chloride levels.

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The heat required to raise the temperature of 8.75 g of water from its melting point to its boiling points is 3.662 kJ.

The amount of heat required to increase the temperature of one gram of a material by one degree Celsius (°C) is defined as specific heat.

The equation q = mcΔt can be used to compute the amount of heat acquired or lost by a specific heat (q), where m is the mass of the sample, c is the specific heat, and Δt is the temperature change.

Given:

m = 8.75

c = 4.186 J/g°C

The melting point and boiling point of water is 0° and 100° respectively.

Δt = 100° - 0° = 100°

We know that,

q = mcΔt

  = 8.75(4.186)100

  = 3.662 kJ

Thus, the heat required to raise the temperature of 8.75 g of water from its melting point to its boiling points is 3.662 kJ.

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For ¹⁴₆C²⁻ ;  Atomic number = 6;  Mass number = 14

Number of electrons = 8; D. Number of protons = 6;  E. Number of neutrons = 8.

The mass number represents the sum of protons and neutrons in the nucleus of an atom or ion.

In this case, the ion is represented by ²⁻, indicating that it has gained two extra electrons.

Since the number of protons remains the same, the mass number can be calculated by adding the protons and neutrons. Therefore, the mass number for ¹⁴₆C²⁻ is 14.

The atomic number represents the number of protons in the nucleus of an atom or ion. In this case, the atomic number is 6.

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The systematic name for the compound Ba(NO3)2 is barium nitrate. Barium nitrate is an inorganic salt with the chemical formula Ba (NO3)2. It is a colorless, odorless, and crystalline solid that is highly soluble in water. The compound is formed by combining one atom of barium and two ions of nitrate.

The name “barium” comes from the Greek word “barys,” which means “heavy,” and is a reference to its high density. The term “nitrate” refers to the polyatomic ion NO3-, which is composed of one nitrogen atom and three oxygen atoms. Barium nitrate is commonly used in pyrotechnics, as it is a powerful oxidizing agent that produces a bright green flame when ignited.

The systematic naming of inorganic compounds is based on the rules set out by the International Union of Pure and Applied Chemistry (IUPAC). The name of an ionic compound is composed of the cation name followed by the anion name. In the case of barium nitrate, “barium” is the name of the cation, while “nitrate” is the name of the anion.

Therefore, the systematic name for the compound Ba(NO3)2 is barium nitrate.

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The mineral that's illustrated based on the information given will be magnetite.

A mineral simply means any pure substance that has a unique composition and structure.

Since the mineral is black and will stick to you when you walk through the sand at the beach, it's magnetite.

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Answer:

ligma

Explanation:

Answer:

What are we solving?

Explanation:

Answer:

Boron

Explanation:

Using the periodic table we can see that Period 2 represents the second row. Group 13 indicates the 13th column.

Answer:

cornea, pupil, lens, vitreous humor

Answer:

cornea, pupil, lens, vitreous humor 

Explanation:

Answer:

13.749 x 10 -3 g

Explanation:

take the number of atoms that you have divided by Avogadro's number and then multiply by the molar mass of the element. :)

The heat of Reaction or Enthalpy is defined as the changes in the heat during a chemical reaction. The change in heat is calculated as the sum of all the heat change in products minus the sum of all the changes in the reactants.

The chemical reaction between nitrogen and oxygen is given as:

\(\rm 2 N O_2 \rightarrow N_2 + 2 O_2\\\\ \rm \Delta\; H_{f} &= 33.84 kJ/mol\)

Now, we know:

Thus, the enthalpy change for the reaction will be 84.6 energy released.

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Answer:

C. 84.6 kJ of energy released

Explanation:

edg 22

In Mendeleev's tables, iodine should be listed before tellurium. Iodine, however, has chemical characteristics with bromine and chlorine. Mendeleev modified the placements of iodine and tellurium.

Because of the orderly arrangement of the elements, it is known as the periodic table. They're arranged in rows and columns, as you'll see. Periods and Groups are the names given to the horizontal rows that run from left to right and indeed the vertical columns that run from top to bottom, respectively.

Mendeleev's stoichiometry was a vertical diagram that included 63 known elements in order of atomic weight and was first published in 1869. Components with comparable characteristics were arranged in horizontal rows.

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\(\bold{\huge{\blue{\underline{ Answers}}}}\)

Ans 1.) Potassium ( 1 ) , palladium (2)

Metals are those which posses lustre, hardness, malleability, ductility etc.

Ans 2.) Oxygen ( 5 ) , Argon ( 4 )

Non metals are those elements which do not possess lustre, hardness, ductility, malleability etc... they are generally brittle in nature.

Ans 3.) Boron ( 3 )

Metalloids are those substances which shows both the properties of metals and nonmetals.

Ans 4.) Boron ( 3 )

Semiconductor are those substances whose conductivity is lie between insulators and conductors.

Ans 5.) Argon(4)

Least reactive gases are those gases which generally do not reactive with any element or having very least reactivity like argon which is noble gas.

Ans 6.) Oxygen (5)

Oxygen is dull, easily breakable and good insulator but only in solid form

Ans 7.) Palladium(2)

Malleability is the property of metals that is drawn metals into thin sheets .

Answer: C

Explanation: because mass number = proton + neutron number and atomic number = proton number

so 16-8=8

Answer:

C. 8

Explanation:

number of neutrons = mass number - atomic number

16-8

8

Clarie is wrong by saying that no force is acting on the apple when it is rest on the table.

Forces always come in pairs. The gravitational force is acting upon the apple and the result is that the matter in the Earth is pulling the matter in the apple. When the apple is set rest on the table, the table exerts a force upward on the apple equal to the force exerted downward, and hence the apple stays without moving. This implies that resting object always have their own gravitational force.

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By following serial dilution method, you can achieve the desired concentrations using small volumes while ensuring accurate dilution ratios. It is essential to handle the small volumes carefully and accurately to maintain the desired concentrations throughout the dilution process.

To perform a serial dilution with small volumes, such as in this case where measuring less than 1µL is not possible, we can use a stepwise dilution approach.

Start with the initial concentration of 14.2mM in 1mL of stock media.

To prepare the first dilution of 10µM, transfer 1µL from the stock solution and add it to 99µL of a diluent (such as water or buffer). This results in a 100µL solution with a concentration of 10µM.

For subsequent dilutions, repeat the same process. Take 1µL from the previous dilution and add it to 99µL of diluent.

Repeat step 3 for each desired concentration. For example, to obtain a concentration of 5µM, take 1µL from the 10µM solution and add it to 99µL of diluent.

Continue this stepwise dilution process until you reach the final desired concentrations: 2.5µM, 1µM, 750nM, 500nM, 250nM, 100nM, 50nM, and 10nM.

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Answer:

SO4²

Explanation:

Formula and structure: The sulfate ion formula is SO42- and the molar mass is 96.06 g mol-1. This salt is formed by one sulfate center to which 4 atoms of oxygen are attached, 2 of these atoms are forming S=O.

Answer:

\(so _{4} ^{2 - } \)

Explanation:

sulfate is consisting of sulfur element with 4 oxygen as the structure in the pic given and this group is 2- charged

Answer:

Even though the two substances possess many similarities, they have some unique properties. In turn, since they have the same properties, if they were the same substance, it would make matters worse, if the same chemical was in two different places, there would not be a difference between them since they are the same, just as it is with are two different chemicals would have differing properties since they are two properties would vary from one another since they are 2 totally different things!

Answer:

Within the visible spectrum, red light has the longest wavelength.

Hope that helps! :)

Explanation:

The number of moles of H atoms in 15.2 grams of pure ice is 0.850 moles

The number of moles of O atoms in 15.2 grams of pure ice is 13.50 moles

An atom is a smallest indivisible particle of a chemical element that is capable of independent existence.

Using the relation:

The number of moles of H2O = 15.2 grams/18.02 g/mol

number of moles of H2O = 0.8435 moles

If the atomic mass of H and O are as follow:

Then:

the number of H atoms in 15.2 grams of pure ice = mass of H atom × molar mass of H2O.

the number of H atoms = 0.8435 mol × 1.00784 g/mol

the number of H atoms = 0.850 moles

the number of O atoms in 15.2 grams of pure ice = 0.8435 mol × 15.999 g/mol

the number of O atoms = 13.50 moles

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The nuclear symbol for an atom with 9 protons and 10 neutrons is 19F the nuclear symbol consists of the atomic number (number of protons) as the subscript and the mass number (sum of protons and neutrons) as the superscript.

In this case, the atomic number is 9, indicating the element is fluorine (F) since the atomic number determines the element's identity. The mass number is calculated by adding the number of protons (9) and neutrons (10), resulting in a mass number of 19. Therefore, the nuclear symbol for this atom is 19F, representing an atom of fluorine with 9 protons and 10 neutrons.

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Given what we know, we can confirm that when forming an expanded octet, selenium hexafluo ride will hold 6 pairs of shared electrons around its center selenium atom.

Therefore, given that during an expanded octet formation, the central atom is capable of holding more than 8 valence electrons in its outer shell, the central atom of a selenium hexafluo ride compound will have 12 electrons being shared, which results in 6 pairs, making C the correct answer.

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(a) To get the pH of the media to 5.8, you would add NaOH solution. NaOH is used as a basic solution, and when it is added to a solution, it will increase the pH of the solution.

(b) The molecular weight of BA is 225.3. To prepare a 1M solution, you would have to weigh out 225.3 grams of BA.(c) To convert a 1M solution of BA to mg/mL, you can use the following equation: 1 mole = molecular weight in grams; 1000 millimoles = 1 mole. So, 1 M = 1000 mg/mL. Therefore, a 1M solution of BA is equivalent to 1000 mg/mL .(d) To convert a concentration of 1000 mg/mL .

Therefore, to calculate the weight required for a 5 mM solution, use the following formula :Mass of BA = molarity × volume × molecular weight= 5 × 0.001 × 225.3= 1.1265 grams(f) To convert a concentration of 5 mM to mg/mL, we use the following formula: Concentration (mg/mL) = (Concentration (mM) × Molecular weight) / 1000= (5 × 225.3) / 1000= 1.1265 mg/mL(g)

To convert a concentration of 1.1265 mg/mL to mg/L, we multiply by 1000, so 1.1265 mg/mL = 1126.5 mg/L.(h) Given that the stock solution of BA is 5 mM and the working solution is 0.2 mg/mL.

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Answer: 2 : 1

Explanation:

Cation :

Ca - calcium = atomic number = 20

Electron dot configuration : 2, 8, 8, 2

Ca losses 2 electrons in its outermost shell and thus has a charge of 2+ in other to attain a stable octet state.

Anion:

F - has 7 valence electrons and thus needs 1 electron to achieve a stable octet state, hence it accepts one electron has has a charge of (-1)

Therefore,

Ratio of cation (+) to negative (-) = 2 :1

Answer: I think 100?

Explanation:

It’s asking for the net FORCE! And the formula to find force is to multiply the mass by the acceleration which would be in this case 0.5x200 which would be 100