Given R = 0.0821L⋅atm/mol⋅K, what is the volume of a mole of gas at a pressure of 2.5 atm and a temperature of 250K?

Answer:

lowers salinity

Explanation: I did the quiz on k-12 hope this helps good luck

In an ecosystem with glaciers its melting lowers salinity of the ocean ,delivering fresh water to the ocean.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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The answer is : C.7

The Group 7A elements have seven valence electrons in their highest-energy orbitals (ns2np5).

Group 7A — The Halogens.

Group 7A (or VIIA) of the periodic table are the halogens:  fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At).  The name "halogen" means "salt former", derived from the Greek words halo- ("salt") and -gen ("formation").

The Group 7A elements have seven valence electrons in their highest-energy orbitals (ns2np5).  This is one electron away from having a full octet of eight electrons, so these elements tend to form anions having -1 charges, known as halides:  fluoride, F-; chloride, Cl-, bromide, Br-, and iodide, I-.  In combination with other nonmetals, the halogens form compounds through covalent bonding.

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The valence electron the halogens posses are 7

The electron in the outermost shell or energy level of an atom

Hence the valence electron of the halogen posses are 7

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The strongest acid among the given options is Option E) HCl (hydrochloric acid).

Acids are substances that release hydrogen ions (H+) in aqueous solution. The strength of an acid is determined by its ability to donate H+ ions. The more H+ ions an acid can donate, the stronger it is.

Among the given options, HCl is the strongest acid because it completely dissociates in water to form H+ and Cl- ions. This means that it has a high tendency to donate H+ ions and is therefore a strong acid. The other options, PH3, H2S, HBr, and H2O, are all weaker acids than HCl.

Therefore, the correct answer is E) HCl.

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The general formula for an aldehyde is CnH2n+1CHO or CnH2nO.

An aldehyde is an organic chemical that contains a functional group with the formula RCH=O. The functional group (without the "R" side chain) is an aldehyde, however it can also be categorized as a formyl group. Aldehydes are widely used and serve vital roles in industry and biology.

Aldehydes have a carbon center that is linked to oxygen by a double bond, hydrogen by a single bond, and a third substituent, which is carbon or, in the case of formaldehyde, hydrogen by a single bond. The middle carbon is frequently described as sp2-hybridized. The aldehyde group is polar in several ways. The length of the C=O bond is around 120-122 picometers.

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An object is said to be accelerated if there is a change in its velocity. The change in the velocity of an object could be an increase or decrease in speed or a change in the direction of motion. The acceleration of the parachute is -8.88 m/s².

The rate of change of velocity with respect to time is defined as the acceleration. It is a vector quantity which has both magnitude and direction. It is the second derivative of position and first derivative of velocity.

Acceleration = Vf - Vi / t

45 - 85 / 4.5 = -8.88 m/s²

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Answer:

Rocks get older as we go away from the Mid Atlantic Ridge  towards the continents

Explanation:

As the plates move away from each other, new ocean lithosphere is created at the ridge. This also widens the ocean basin and leads to sea floor spreading.

The rock of the ocean floor are symmetrically aligned and they get become older as they move away from the crest of the ridge.

Thus, rocks get older as we go away from the Mid Atlantic Ridge  towards the continents

In the electron configuration 2 8 18 6 for element 34, Selenium:

The statement that applies include:

Selenium is a chemical element with the symbol Se and atomic number 34 and  a nonmetal with properties that are intermediate between the elements above and below in the periodic table, sulfur and tellurium, and also has similarities to arsenic.

The octet rule refers to the chemical rule of thumb which states that the tendency of atoms to prefer to have eight electrons in the valence shell.

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The lysis reaction with the formation of two different gases, and the synthesis reaction with the reaction of hydrogen and oxygen support that water is a compound and not an element.

The electrolysis is the analytical process for the separation or the deposition of the element in the presence of the electric field.

The passing of electric current through water results in the release of two types of gases. Thus, it can be said that water lysis or breakdown forms the release of two elements hydrogen and oxygen supporting the fact that water is a compound and not an element.

The production of water is found to be formed with the reaction of hydrogen with oxygen. Thus it supports that water is a compound and, not an element.

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Answer:

Negative, because the potential energy of the reactants is higher than the potential energy of the products

Explanation:

Exothermic reaction is a reaction in which heat is released to surrounding. This is due to the fact that the heat content of the reactant is higher than the heat content of product thus producing a negative enthalpy change (ΔH) i.e

Enthalpy change = Heat of product – Heat of reactant

ΔH = Hp – Hr = negative

Considering the options given in the question above, the correct answer is:

Negative, because the potential energy of the reactants is higher than the potential energy of the products

Answer: 15.83 mol

Explanation:

To convert from atoms to moles, we will need to use Avogadro's number.

Avogardo's number: 6.022×10²³ atoms/mol

\(9.53*10^{24} atoms*\frac{1mol}{6.022*10^2^3 atoms} =15.83 mol\)

Now, we know that there are 15.83 moles.

Answer:

Genetics

Explanation:

I did this question five minutes ago on Edge.

Answer:

Just add what they equal to hope this helps :)

Explanation:

Boron (B) is not a diatomic element. It is a metalloid that is solid at room temperature and pressure.

The elements that occur naturally as a liquid at standard temperature and pressure (room temperature and 1 atm of pressure) are Bromine (Br) and Mercury (Hg). Bromine is a halogen that is a dark red, volatile liquid at room temperature and pressure.

It has a very strong odor and is highly toxic. Mercury is a transition metal that is a silver, heavy liquid at room temperature and pressure. It is also toxic and can cause damage to the nervous system and kidneys.

The seven diatomic elements are hydrogen (H2), nitrogen (N2), oxygen (O2), fluorine (F2), chlorine (Cl2), bromine (Br2), and iodine (I2).

These elements naturally occur in pairs, with each atom sharing a covalent bond with its partner. These elements are gases at room temperature and pressure except for bromine, which is a liquid.

Diatomic molecules are extremely stable and difficult to break apart, so these elements are typically found in their diatomic form rather than as individual atoms.

It has a high melting point and is used in a variety of industrial applications, including as a component in glass and ceramics.

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Answer:

As a wavelength increases in size, its frequency and energy (E) decrease. From these equations you may realize that as the frequency increases, the wavelength gets shorter. As the frequency decreases, the wavelength gets longer.

Explanation:

Answer:

Forests can affect environmental conditions in ways that enhance their survival. This effect may contribute to a positive feedback whereby deforestation could degrade environmental conditions and inhibit forest re-establishment

Explanation:

A good example of a negative feedback mechanism will be if the increase in temperature increases the amount of cloud cover. The increased cloud thickness or amount could reduce incoming solar radiation and limit warming.

Answer:

I think it's true

Explanation:

hey by the way

Answer:

Plants and animals have different cell types, one is a autotroph and one is a heterotroph, plants can use photosynthesis and animals cannot.

Explanation:

The concentrations of the ions remaining in solution after the reaction is complete can be calculated as follows: [Mg²⁺] = 0.0684 M and [NO₃⁻] = 0.0952 M.

To calculate the concentrations of the ions remaining in solution after the reaction is complete, we need to determine the number of moles of each ion present in the initial solutions and then calculate their concentrations.

First, let's calculate the number of moles of Mg(NO₃)₂ in the 22.02 mL solution. We can use the formula:

moles = mass / molar mass

The molar mass of Mg(NO₃)₂ is 148.31 g/mol. Plugging in the values:

moles of Mg(NO₃)₂ = 1.615 g / 148.31 g/mol = 0.0109 mol

Next, we calculate the number of moles of NaOH in the 28.64 mL solution. The molar mass of NaOH is 39.997 g/mol:

moles of NaOH = 1.073 g / 39.997 g/mol = 0.0268 mol

Since the reaction between Mg(NO₃)₂ and NaOH is a 1:2 ratio, we need to compare the moles of Mg(NO₃)₂ to the moles of NaOH. In this case, we have twice as many moles of NaOH:

moles of NaOH used = 0.0109 mol * 2 = 0.0218 mol

To find the moles of Mg(NO₃)₂ and NaOH remaining after the reaction, we subtract the moles used from the initial moles:

moles of Mg(NO₃)₂ remaining = 0.0109 mol - 0.0218 mol = -0.0109 mol (negative because it is completely consumed)

moles of NaOH remaining = 0.0268 mol - 0.0218 mol = 0.0050 mol

Now we can calculate the concentrations of the remaining ions. Since the volumes are additive, the total volume of the resulting solution is 22.02 mL + 28.64 mL = 50.66 mL = 0.05066 L.

Concentration (M) = moles / volume (L)

[Mg²⁺] = (-0.0109 mol) / 0.05066 L = 0.2152 M ≈ 0.0684 M (rounded to four significant figures)

[NO₃⁻] = (-0.0109 mol) / 0.05066 L = 0.2152 M ≈ 0.0952 M (rounded to four significant figures)

Therefore, the concentrations of the ions remaining in solution after the reaction is complete are approximately [Mg²⁺] = 0.0684 M and [NO₃⁻] = 0.0952 M.

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Answer:

See explanation

Explanation:

A dipole refers to a bond in which its two ends have opposite charges. A dipole results from a large difference in electronegativity between two atoms in a bond.

For instance, consider the bond between hydrogen and chlorine in HCl. The electronegativity of hydrogen is 2.2 while that of chlorine is 3.16. The significant electronegativity difference between the two atoms leads to a charge separation.

A partial positive charge appears on the atom that is less electronegative (hydrogen) while a negative charge appears on the more electronegative atom (chlorine).

This charge separation occurs because the shared electrons of the bond are more closely attracted to chlorine making it partially negative compared to hydrogen. A dipole moment now exists in the H-Cl bond hence the molecule is said to have a dipole.

Definite volume and shape represents solid, Indefinite shape and definite volume represents Liquid state, substances with an indefinite shape and an indefinite volume represents Gaseous state. The correct option to this is A.

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Answer:

Continental Drift

Explanation:

The fossils of sea creatures could have reached the top of Mount Everest due to the continental drift theory suggested by geophysicist, Alfred Wegener. To exaggerate, a piece of evidence that supports Wegener’s hypothesis towards a continental drift is the fact that fossils of sea creatures can’t just end up in any random place like Mount Everest. He suggests that there must be something behind this and gradually it led to his well-known theory. His hypothesis towards a continental drift suggests that his second observation was that fossils of the same prehistoric species were found in different continents that were way apart. There was just no way that all the organisms could cross the oceans and reach all of these places.

Answer: molecules get closer

Explanation:

Condensation is the process in which molecules of a gas slow down, come together, and form a liquid. When gas molecules transfer their energy to something cooler, they slow down and their attractions cause them to bond to become a liquid

hope this helps

pls mark me brainliest

Answer:

D. The molecules get closer together and move more slowly.

Answer:

process of depositing a thin layer of any superior metal over an object of a cheaper metal, with the help of electric current

Explanation:

I hope this help have an great day and stay health

The following is true of pericyclic reactions: D. All of these statements are true of pericyclic reactions. The correct option is D.

Pericyclic reactions are a class of organic reactions that involve the simultaneous rearrangement of sigma bonds and pi bonds in a cyclic transition state. These reactions exhibit several characteristic features.

A. They are concerted reactions: Pericyclic reactions occur in a single step, without the formation of any intermediates. The reactants rearrange their bonds simultaneously to form the products.

B. They proceed via a cyclic transition state: During the reaction, the reactant molecules pass through a cyclic transition state where the rearrangement of bonds takes place. This cyclic transition state is often visualized as a ring-shaped structure.

C. No intermediates are formed: As pericyclic reactions are concerted, they do not involve the formation of any intermediates along the reaction pathway.

Therefore, all of these statements are true of pericyclic reactions. They are concerted, proceed via a cyclic transition state, and do not involve intermediates. These characteristics make pericyclic reactions distinct from stepwise reactions that involve the formation of intermediates. The correct option is D.

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Since Q > Ksp, a precipitate forms in the mixed solution. The precipitate is calcium fluoride (\(CaF_{2}\)).

A solution containing sodium fluoride is mixed with one containing calcium nitrate to form a solution that is 0.015 M in NaF and 0.010 M in \(Ca(NO_{3})_{2}\). To determine if a precipitate forms in the mixed solution, follow these steps:

1. Write the possible reaction between the ions in the solution: NaF (aq) + \(Ca(NO_{3})_{2}\) (aq) → \(NaNO_{3}\) (aq) + \(CaF_{2}\) (s)

2. Identify the solubility rules for the potential products. Sodium nitrate ( \(NaNO_{3}\)) is soluble because nitrates are generally soluble. Calcium fluoride ( \(CaF_{2}\)) may be insoluble, as fluorides often have limited solubility.

3. Calculate the ion product (Q) and compare it with the solubility product constant (Ksp) of  \(CaF_{2}\). If Q > Ksp, a precipitate will form. Q = \([Ca_{2+}][F-]^{2}\). The concentrations of ions in the mixed solution are: [\(Ca_{2+}\)] = 0.010 M (from \(Ca(NO_{3})_{2}\)) [F-] = 0.015 M (from NaF)

So, Q = (0.010) × (\(0.015^{2}\)) = 2.25 × \(10^{-6}\) The Ksp of  \(CaF_{2}\) is 3.9 × \(10^{-11}\).

4. Compare Q with Ksp: Q (2.25 × \(10^{-6}\)) is greater than Ksp (3.9 ×  \(10^{-11}\)).

Since Q > Ksp, a precipitate forms in the mixed solution. The precipitate is calcium fluoride (  \(CaF_{2}\)).

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Answer:  81.7 ml

Explanation:  

1 cm^3 = 1 ml

Divide the total mass by it's density to find it's volume:

(52.4g/7.87g/ml) = 6.658 ml

Add to 75.0 ml to arrive at a final volume of 81.7 ml

Answer:

B

Explanation:

Answer:

its  D  I  just  took  the  test

Explanation:

Answer:

An ion is an atom or molecule that has a different number of electrons than protons, so it has a charge.

Explanation:

Trust me please

Answer:

The water level in the pipe went down.] ... [The hot water in the cup heated up the water particles inside the bottle. They began to move more. Greater motion (kinetic energy) pushed the particles farther apart, resulting in expansion.