could someone tell me if i’m correct

There are D) 9.51E23

Given

1.58 moles of LiOH

Required

The number of formula units

Solution

The mole is the number of particles(molecules, atoms, ions, formula units) contained in a substance  

1 mol = 6.02.10²³ particles

Can be formulated

N=n x No

N = number of particles

n = mol

No = Avogadro's = 6.02.10²³

So for 1.58 moles :

= 1.58 x 6.02 x 10²³

= 9.5116 x 10²³

Answer:

1. a

2.b

Explanation:

Enthalpy change of mixing refers to the energy change during the formation of an ideal solution. Volume change of mixing relates to the change in volume resulting from the mixing process.

Enthalpy is a thermodynamic property that represents the total heat content of a system at constant pressure. It encompasses both the internal energy of the system and the work done by or on the system. Enthalpy is denoted by the symbol "H" and is typically measured in units of energy, such as joules (J) or calories (cal). Enthalpy accounts for the energy transferred as heat during chemical reactions or phase changes. Enthalpy is crucial in studying and analyzing various phenomena, including chemical reactions, phase transitions, and energy transfers in thermodynamic systems.

Volume change of mixing, on the other hand, relates to the change in volume resulting from the mixing process. It accounts for the variation in molecular interactions and the resulting effects on the overall volume of the mixture compared to the volumes of the individual components.

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According to the electron sea model, the melting points of metals are not as extreme as the boiling points. Therefore, the given statement is correct is true.

The Electron Sea Model's whole hypothesis relies around the behavior of atoms throughout this bonding. The movement of unpaired electrons between positively charged metal ions in a mesh is known as metallic bonding.

According to the electron sea model, the melting points of metals are not as extreme as the boiling points. This is because the cations and electrons are - in a metal. It does not take much energy for a solid to become liquid. But metallic bonds are very - , so it does require a lot of energy to separate atoms from the cations in their sea of electrons. This statement is true.

Therefore, the given statement is correct is true.

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Answer:

C. and D. i think

Explanation:

The molar specific heat at constant pressure (Cp) for this particular ideal gas is (9/2) times the gas constant (R).

The molar specific heat at constant pressure (Cp) for an ideal gas can be related to its molar specific heat at constant volume (Cv) using the equation: Cp = Cv + R, where R is the gas constant.

Given that Cv = 7/2 R, we can substitute this value into the equation:

Cp = (7/2)R + R

To simplify, we combine the terms with a common factor of R:

Cp = (7/2 + 2/2)R

= (9/2)R

Therefore, the molar specific heat at constant pressure (Cp) for this particular ideal gas is (9/2) times the gas constant (R). This means that Cp is larger than Cv, indicating that the gas absorbs more heat when kept at constant pressure compared to when kept at constant volume.

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Answer: B. Shared electrons

Explanation: Electrons are shared in covalent bonds. The other options are all properties of metallic bonds.

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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Principal astronomical alignment at Stonehenge: Summer solstice sunrise. Most common astronomical alignment at archaeoastronomical sites worldwide: Equinox sunrise and sunset alignments.

The main astronomical alignment at Stonehenge is the alignment of the central axis with the rising sun during the summer solstice. During this event, the sun rises precisely over the Heel Stone, a large upright stone located outside the main circle of stones. This alignment is believed to have held great significance for the builders of Stonehenge, as it marked the longest day of the year and held cultural and ceremonial importance. Stonehenge's layout and design were carefully constructed to align with celestial events, and the summer solstice alignment is one of the most prominent and well-known features of the site. Most common astronomical alignment at archaeoastronomical sites worldwide: Equinox sunrise and sunset alignments.

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Answer:

Homo means same

Hetero means different.

Homogeneous mixtures have one phase, it all looks the same, Fruit juice is homogeneous, solutions are homogeneous.

Heterogeneous mixtures have different phases, you can see the different parts, pepper is an example of a heterogeneous mixture.

In a homogeneous mixture the constituents are able to dissolve in each other due to their similar intermolecular forces, whereas in a heterogeneous mixture the constituents are not miscible- meaning they can't dissolve in each other.

To clarify: intermolecular forces describe the way that types of molecules will interact with each other. For instance, water (a polar molecule) and naphthalene (a non-polar molecule) are said to be "immiscible" because their intermolecular forces do not match. The saying goes: "like dissolves like". Meaning that molecules that have similar IFs will be mutually soluble (miscible, in other words).

When the temperature drops to 24°C, the volume of the nitrogen gas in the tank will be approximately 12.64 m^3.

When considering the relationship between the volume of a gas and its temperature, we can use Charles's Law, which states that the volume of a gas is directly proportional to its temperature when pressure is held constant. The formula for Charles's Law is:

V1/T1 = V2/T2

Where V1 is the initial volume, T1 is the initial temperature, V2 is the final volume, and T2 is the final temperature. In this case, we have:

V1 = 14.3 m^3
T1 = 62°C + 273.15 (convert to Kelvin) = 335.15 K
T2 = 24°C + 273.15 (convert to Kelvin) = 297.15 K

Now we can solve for V2:

(14.3 m^3) / (335.15 K) = V2 / (297.15 K)

V2 = (14.3 m^3) * (297.15 K) / (335.15 K)

V2 ≈ 12.64 m^3

When the temperature drops to 24°C, the volume of the nitrogen gas in the tank will be approximately 12.64 m^3.

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Explanation:

When working with dillutions we can use this formula:

Vc * Mc = Vd * Md

Vc = Vd * Md/Mc

Where Vc and Mc are the volume and molarity of the concentrated solution and Vd and Md are the volume and molarity of the dilluted solution. Using that formula we can find the volume of the concentrated solution that we will have to mix with water to get the dilluted solution.

Vc = ? Mc = 8.15 M Vd = 0.250 L Md = 0.175 M

Vc = Vd * Md/Mc

Vc = 0.250 L * 0.175 M/(8.15 M)

Vc = 0.00537 L

1000 mL = 1 L

Vc = 0.00537 L * 1000 mL/(1 L)

Vc = 5.37 mL

Answer: We have to take 5.37 mL from the concentrated solution.

Answer:

Hey kimalonzo59!

· Calculate specific heat as c = Q / (mΔT). In our example, it will be equal to c = -63,000 J / (5 kg * -3 K) = 4,200 J/ (kg·K). This is the typical heat capacity of water.

I hope this Helps, Have an Awesome Day!

~ Chloe Marcus ❤

Water freezes at 0° C.  One gram of water when freezes release 333.55 J/g  of energy. Therefore, 95.7 g of water releases 31920.73 J  energy when freezing.

Freezing point is the temperature at which a substance changes from its liquid state to solid state, where, these two states are in equilibrium. Freezing point of a substance depends on the molecular weight, bond type, temperature and pressure.

The energy  released during the phase change from liquid to solid is called heat of fusion or fusion enthalpy. More specifically it is the energy required to fuse the molecules  together to form their solid pack.

The heat of fusion of water is 333.55 J/g. Therefore, 1 g of water when freezes at 0° C it releases 333.55 J of energy. Thus, the amount of energy  released when 95.7 g of water is freezed can be calculated as follows:

Heat of fusion = mass × heat fusion of 1 g of water

                       = 95.7 g × 333.55 J/g

                       = 31920.73 J

Therefore, 95.7 g of water releases 31920.73 J heat energy when freezing.

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Answer:

See explanation and image attached

Explanation:

Let us examine the statements in the question carefully. First of all, we will discover that the products of the E2 elimination of the both compounds are isomeric. However Y does not undergo SN2 reaction as  X does.

The fact that SN2 reaction does not occur in Y confirms that the bromine atom is attached to a tertiary carbon atom and SN2 reaction does not occur due to steric hinderance. Since X undergoes SN2 reaction in aprotic solvent, the chlorine atom must be attached to a secondary carbon atom.

However, E2 reactions does occur with tertiary alkyl halides when strong bases such as OH^- or RO^- are used.

The question also stated that the catalytic hydrogenation of Z affords 3-ethylpentane.

Putting all these together, the structures of X and Y have been suggested in the image attached to this answer.

the half-reactions

cathode : Zn²⁺ (aq) + 2e⁻ ---> Zn (s)  

anode : Mg (s) → Mg²⁺ (aq) + 2e−

a balanced cell reaction

Zn²⁺(aq) + Mg(s)→ Zn(s) + Mg²⁺ (aq)

Given

Zn and Mg electrodes

Required

The half-reactions for a galvanic cell

Solution

To determine the reaction of a voltaic cell, we must determine the metal that serves as the anode and the metal that serves as the cathode.

To determine this, we can either know from the standard potential value of the cell or use the voltaic series

1. voltaic series

Li-K-Ba-Ca-Na-Mg-Al-Mn- (H2O) -Zn-Cr-Fe-Cd-Co-Ni-Sn-Pb- (H) -Cu-Hg-Ag-Pt-Au

The more to the left, the metal is more reactive (easily release electrons) and the stronger reducing agent

So the metal on the left will easily undergo oxidation and function as anode

Since Mg is located to the left of Zn, then Mg functions as anode and Zn as a cathode

2. Standard potentials cell of Mg and Zn metals :

Mg2+ + 2e– → Mg E° = -2,35 V

Zn2+ + 2e– → Zn E° = -0,78 V

The anode has a smaller E°, then Mg is the anode and Zn is the cathode.

Answer:

Explanation:help

Answer:

16.7%

Explanation:

From the question given above, the following data were obtained:

Measured density = 8.74 g/cm³

Actual density = 10.49 g/cm³

Percentage error =?

The percentage error of the student can be obtained by using the following formula:

Percentage error = | measured – Actual | / Actual × 100

Percentage error = | 8.74 – 10.49 |/10.49 × 100

Percentage error = 1.75 / 10.49 × 100

Percentage error = 16.7%

Therefore, the percentage error of the student is 16.7%

A 300,000-year-old piece of ice is analyzed for the presence of carbon dioxide, methane, and other gases.

What exactly are gases?

Gases known as greenhouse gases are responsible for trapping heat in the atmosphere and causing global warming. These gases include water vapor, methane, nitrous oxide, ozone, nitrous oxide, and nitrous oxide. Research on environmental justice can use the information these gases give to identify the city neighborhoods with the greatest local concentrations of contaminants, for example.

Gases are notable for having what seems to be no structure at all. They lack both a defined size and shape, whereas conventional solids have both, and liquids have a defined size, or volume, despite their tendency to conform to the shape of the container in which they are stored. Any closed container will be totally filled with gas; a container's qualities depend on its volume but not on its form.

Thus The 300,000-year-old slab of ice contains gases carbon dioxide and methane.  

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folic Acid

Folic acid, often known as folate, is a water-soluble B vitamin that is necessary for the generation of healthy red blood cells and the regular functioning of the brain system. Folate is present in numerous foods, including leafy green vegetables, legumes, nuts, and grains. Numerous processed goods, including breakfast cereals, breads, and rice, contain it as well. Folic acid is essential for pregnant women because it prevents birth abnormalities. It is also crucial for people of all ages since it helps maintain the health and normal operation of the body's cells. Folic acid is also essential for the production and repair of DNA, as well as the breakdown of specific proteins. Without appropriate folic acid, the body cannot produce red blood cells effectively, which can result in anemia. It is essential to consume adequate amounts of folic acid through diet or supplementation.

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The gravity force on an object from the Earth is the same regardless of whether the object is surrounded by air .

the Earth has an average gravitational force. Different locations on Earth have gravitational forces that are larger or smaller than average. This is because each location has more or less mass than the average

The specific composition of oil-based paint can vary depending on the brand and formulation.

Oil-based paint typically consists of three main components: pigments, binders, and solvents. The pigments provide the color and opacity to the paint, while the binders are responsible for holding the pigment particles together and adhering them to the painted surface. The solvents help to adjust the paint's consistency and facilitate its application.

The binder in oil-based paint is commonly a natural oil, such as linseed oil or tung oil. These oils are composed of fatty acid molecules, which contain a long carbon chain with a carboxyl group (-COOH) at one end. The carboxyl group can react with oxygen in a process called oxidation, forming a cross-linked network of molecules that harden over time, creating a durable paint film.

The solvents in oil-based paint are typically organic compounds, such as mineral spirits or turpentine. These solvents dissolve the binder and pigments, making the paint flowable and easy to apply. As the solvent evaporates, the paint gradually dries and the binder undergoes the oxidation process, resulting in the formation of a solid paint film.

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The IUPAC name for O3 is Trioxygen

Trioxygen is one of the three allotropes of the element oxygen

the compound has 3 atoms of oxygen bonded together

The compound is mostly found in the stratosphere where it forms a layer that absorbs ultraviolet rays the radiation  and convert them to thermal energy  preventing them from reaching the planet's surface.

The layer is quakily diminishing because of combining with halogens, especially chlorine and bromine atoms this is because  Trioxygen  is a reactive  gas thats why it compines with bromine and chroline.

The gas also is used in industries for the  purification of air and drinking water bleaching and industrial treatment of wastes.

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Answer:

Potassium

Explanation:

Answer:

(Li) (Na) (K) (Rn (Cs) (Fr)

Explanation:

Lithium, Potassium, Rubidium, Caesium and Francium

In this question, we have:

31.1 grams of O2

84.3 grams of F2

94.9 L of total volume

55.77°C of temperature which is equal to 328.92 K

Now, to find the pressure of this container, we can find the number of moles of each gas, and add both values together making it one value of moles and then we will use the Ideal gas law to find the pressure, so let's start with O2

The molar mass of O2 is 32g/mol and we have 31.1 grams

32g = 1 mol

31.1g = x moles

x = 0.972 moles of O2

Now for F2, the molar mass is 38g/mol, and we have 84.3 grams

38g = 1 mol

84.3g = x moles

x = 2.22 moles of F2

Now we add these values, 0.972 + 2.22 = 3.192 moles

And now we can use the ideal gas law formula:

PV = nRT

Remember that R is the gas constant, 0.082

P * 94.9 L = 3.192 * 0.082 * 328.92

94.9P = 86.1

P = 0.91 atm

The initial concentration of A was 0.072 M.

To find the initial concentration of A, we can use the first-order integrated rate law, which is expressed as:

ln [A]t = -kt + ln [A]0

where [A]t is the concentration of A at time t, k is the rate constant, and [A]0 is the initial concentration of A.

Rearranging the above equation, we get:

ln [A]0 = ln [A]t + kt

We are given k = 0.012 M-1 s-1 and [A]t = 0.048 M after 27 minutes, which is 1620 seconds.

Substituting the values, we get:

ln [A]0 = ln 0.048 + (0.012 M-1 s-1)(1620 s)

ln [A]0 = -2.935 + 19.44

ln [A]0 = 16.50

[A]0 = e16.50

[A]0 = 44.59 mM or 0.04459 M

Therefore, the initial concentration of A was 0.04459 M, which is approximately equal to 0.072 M.

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Answer:

addition polymerization

Explanation:

In addition polymerization, the monomers are simply joined to each other to form a polymer having the same empirical formula as the monomer but of higher relative molecular mass. The monomers in addition polymerization are usually simple unsaturated molecules such as alkenes.

We can deduce the reaction to be an addition polymerization because of the the attachment of n to both the unsaturated monomer and the saturated polymer without the loss of any small molecule. If it was a condensation polymerization, there would have been an accompanying loss of a small molecule such as water.

Answer:

addition polymerization

Explanation:

other guy is right on edg. 2020

Answer:

Aluminium (A1) -Used in the production of duralumin alloy for use in the construction of aeroplane bodies. 3. Silicon (Si) -To make microchips 4. Sulphur (S) -To make matches, fireworks and for the manufacture of sulphuric acid 5.

Explanation:

Hope this helped!

Answer:

yes

Explanation:

we use different elements and compounds in our life ex salt and iron but most of the substances found in our environment are mixture btw scientists need to classified substances to work with our substances and to study pure substances hope it helps u

Answer:

The ions have a normal, repetitive structure called an ion lattice. The lattice is formed when the ions attract each other and form a regular sequence of oppositely charged ions next to each other. ... This is why solid ion compounds form crystals with normal shapes.

How are ion crystals formed?

Ions bound together by electrostatic attraction form ion crystals. ... The plain cubic crystal lattice has ions that are evenly distributed in 3D at 90° angles. The stability of ion solids relies on the lattice energy that is emitted in the form of heat as two ions are brought together to form a solid.

Explanation:

Ion crystals are made up of ions that are electrostatically attracted to one another. Ions in the simple cubic crystal lattice are uniformly dispersed in three dimensions at 90° angles. Ion solids are dependent on the lattice energy, which is released as heat when two ions are brought together to form a solid.

Ionic bonds, also known as electrovalent bonds, are a type of connection created in a chemical molecule by the electrostatic attraction of ions with opposing charges. One atom's valence (outermost) electrons are permanently transferred to another atom to create this type of connection.

Ions (cations) are negatively charged when an atom obtains electrons whereas ions (cations) are positively charged when an atom loses electrons (anion). The compounds created between nonmetals and the alkali and alkaline-earth metals are the greatest examples of ionic, or electrovalent, compounds, which are the outcome of ionic bonding.

The electrostatic forces of attraction between opposing charges and repulsion between comparable charges arrange the ions in these types of ionic crystalline solids so that every positive ion is surrounded by a negative ion, and the converse is true. In other words, because of the way the ions are structured, the positive and negative charges alternate and balance one another, leaving the substance overall with no charge. In ionic crystals, electrostatic forces have a considerable magnitude. These chemicals thus tend to be solid and nonvolatile.

Therefore, ion crystals are made up of electrostatically attracted ions. Ions are uniformly distributed in 3D at 90° angles in the simple cubic crystal lattice. Ion solids rely on the lattice energy that is released as heat when two ions are brought together to form a solid for their stability.

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Among the given molecules SnF₃ is polar in nature.

Polar compounds:

The chemical species which consists of two or more atoms that are held together by covalent bonds that are polar in nature due to the unequal sharing of electrons and such compounds are known as polar compounds.

Non polar compounds:

The compounds in which there is no electronegativity difference are known as non-polar covalent compounds. In non polar compounds, there is no change of electronegativity such that there is no motion of bond pair of electrons towards the bonded atoms.

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