Select the most likely lattice types for each of the following salts: (a) BeF2; (b) CaO; (c) BeI2; and (d) CaF2. The radius of Be is 34 pm, F is 133 pm, Ca is 106 pm, O is 140 pm, I is 220 pm, and Te is 211 pm.

Answer:

The answer is B

Explanation:

Protons and electrons have to be equal numbers for it to be neutral

Answer:b

Explanation:

Hello there! :)

\(\huge\boxed{\text{11.315 mol}}\)

We can use dimensional analysis to convert from grams to moles. Use the atomic weight of argon to determine the amount of g/mol.

\(452g * \frac{1 mol}{39.948g} = \frac{452}{39.948}mol = 11.315mol\)

Therefore, there are approximately 11.315 moles in 452 grams of argon.

The number of moles that are contained in the given mass of argon is equal to 11.32 moles.

Given the following data:

Mass of argon = 452 grams.

Scientific data:

Molar mass of argon = 39.948 g/mol.

In this exercise, you're required to determine the number of moles of argon that are contained in the given sample.

Mathematically, the number of moles contained in a given mass of chemical compound is calculated by this formula:

\(Number \;of \;moles = \frac{mass}{molar\;mass}\)

Substituting the given parameters into the formula, we have;

Number of moles = 452/39.948

Number of moles = 11.32 moles.

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When one molecule of benzil reacts with one molecule of 1,3-diphenylacetone, two aldol condensation reactions will occur in the process of forming the final product.

It undergoes 2 aldol process because both benzil and 1,3-diphenylacetone have two carbonyl groups each, which can undergo aldol condensation. As a result, two α,β-unsaturated ketones will be formed, which will then undergo a dehydration reaction to form a final product known as dibenzalacetone.

Here's a step-by-step explanation:

1. An enolate ion is formed from 1,3-diphenylacetone in the presence of a base.
2. The enolate ion attacks the carbonyl group of benzil, leading to the formation of an alkoxide ion.
3. The alkoxide ion undergoes a proton exchange, resulting in a β-hydroxy ketone intermediate.
4. The β-hydroxy ketone intermediate undergoes an intramolecular dehydration reaction, eliminating a water molecule and forming a double bond.
5. Steps 2-4 occur once more, resulting in the final product.

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Answer:

Consumption of Antacid

Explanation:

At breakfast when Peter ate junk food , excess acid could have got released due to which he had got acidity in his stomach. By consumption of Antacid can reduce the effect of acidity because antacid is a mild base. When a mild base reacts with acid it neutralises the effect of acid & hence gives a relief from acidity...

Answer:

Acting like a highly reflective blanket, the cryosphere protects Earth from getting too warm. Snow and ice reflect more sunlight than open water or bare ground. Changes in snow and ice cover affect air temperatures, sea levels, ocean currents, and storm patterns all over the world.

Explanation: Hope this answers your question

Answer:

#1=Heterogenous

#2=Homogenous

#3=Heterogenous

#4= Heterogenous

#5= Homogenous

#6=Homogenous

#7= Heterogenous

#8=Heterogenous

#9=Homogenous

Answer

In summary

A number of properties of liquids, such as cohesion and adhesion, are influenced by the intermolecular forces within the liquid itself. Cohesion are various intermolecular forces that hold solids and liquids together while adhesion is the ability of a liquids to stick to an unlike substance. The rise or fall of a liquid in a capillary tube is governed by the balance of cohesive and adhesive forces. Lastly, surface tension is a fundamental property of the surface of liquid, it is responsible for the curvature of the surfaces of liquids dues to the polarity that exists in the liquid molecules.

Explanation

Liquids flow because the intermolecular forces between molecules are weak enough to allow the molecules to move around relative to one another. The forces are attractive when a negative charge interacts with a nearby positive charge and repulsive when the neighboring charges are the same, either both positive or both negative. Molecules are held together by polar covalent bonds – which means that the electrons are not evenly distributed between the bonded atoms. This uneven distribution in the covalent bonds of the molecules results in a partial charge.

The liquid molecules don’t interact particularly strongly with each other because the intermolecular forces are weak. The primary intermolecular forces – are London dispersion forces, which for small molecules are the weakest types of intermolecular forces. These weak forces lead to low cohesion. The molecules don’t interact strongly with each other, so they can slide right past one another.

Adhesion is the tendency of a compound to interact with another compound. (Remember that, in contrast, cohesion is the tendency of a compound to interact with itself.) Adhesion helps explain how liquids interact with their containers and with other liquids. One example of an interaction with high adhesion is that between water and glass. Both water and glass are held together by polar bonds. Therefore, the two materials can also form favorable polar interactions with each other, leading to high adhesion.

If 28.4 g of HgO decomposes and produces 2.0 g of oxygen, then 26 grams of Hg is produced.

Decomposition reactions occur when complex chemical entities split apart into smaller components. Decomposition reactions often demand energy input.

There are three different kinds of breakdown reactions: thermal, photolytic, and electrolytic.

\(Mass_{reactant\) = \(Mass_{product}\)

\(Mass_{mercury oxide\) = \(Mass_{mercury} + mass_{oxygen}\)

28g =        \(mass_{mercury}\) + 2g

   \(mass_{mercury}\) = 26g

Thus, 28.4 g of HgO decomposes and produces 2.0 g of oxygen, then 26 grams of Hg is produced.

\(percentage mass_{mercury} = \frac{mass_{mercury}}{mass_{mercury}oxide}\)  X 100%

= 26g/28g

= 93%

thus  93% is the percent by mass of Hg present in HgO.

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Answer:

Carbon dioxide is held together by weak intermolecular forces (only London dispersion LD) and is a non-polar molecule. Because of this weak attraction, it exists as a gas. Water on the other hand is polar (dipole forces DP), and has a stronger hydrogen bond existing within it (in addition to LD). This makes it attract itself more than say carbon dioxide molecules, so it commonly exists as a liquid. Finally, salt like water is polar, and has ionic bonds that are even stronger than a hydrogen bond. This makes salt have a great attraction to itself, sticking together as a solid because its molecules cant easily be broken up.

Explanation:

These are the strongest intermolecular forces ranked from strongest to weakest.

1. Network Covalent

2. Ionic

3. Hydrogen Bonding

4. Dipole Dipole

5. London Dispersion

Lewis formula for C4H6: Since C4H6 is composed up of covalent bonds, the total number of electrons will equal the sum of the electrons in carbon and hydrogen, providing there is no residual charge.

The hydrogen atom has one electron, while the carbon atom has six.

As a result, there will be a total of = (4 6) + (6 1) = 30 electrons.

Steps to draw lewis structure

Find the polyatomic ion or molecule's total number of valence electrons. Add one electron for each negative charge if the compound is an anion. For each positive charge if the substance is a cation, take one electron away.

The least electronegative element other than hydrogen makes up the centre atom. Single bonds join it to the outside atoms.

Fill the outside atoms' octets.

Fill the centre atom's octet.

Form several bonds until the core atom has an octet if you run out of electrons before it does.

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Answer:

Limited

Explanation:

Once it is used once, it is not reusable. Also, there's a possibility to use ALL the coal there is. That's why it's an unrenewable source, unlike the sun, wind, or water that never ends. Those are renewable

Answer:

Limited.

Explanation:

Coal comes from plants the died 100-400 million years ago and takes million years to form. Therefore, Coal is limited.

The volume of 0.26 M HBr required to neutralize 40 mL of 0.8 M NaOH is 123.08 mL

We'll begin by writing the balanced equation for the reaction. This is given below:

HBr + NaOH —> NaBr + H₂O

From the balanced equation above,

The mole ratio of the acid, HBr (nA) = 1

The mole ratio of the base, NaOH (nB) = 1

From the question given above, the following data were:

Volume of base, NaOH (Vb) = 40 mL

Molarity of base, NaOH (Mb) = 0.8 M

Molarity of acid, HBr (Ma) = 0.26 M

The volume of the acid, HBr needed for the reaction can be obtained as follow:

MaVa / MbVb = nA / nB

0.26 × Va / (0.8 × 40) = 1

0.26 × Va / 32 = 1

Cross multiply

0.26 × Va = 32

Divide both side by 0.26

Va = 32 / 0.26

Therefore, the volume the acid, HBr needed to neutralize the base, NaOH is 123.08 mL

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Answer:

i think false

Explanation:

Centre of mass is the point at which the distribution of mass is equal in all directions, and does not depend on gravitational field. Centre of gravity is the point at which the distribution of weight is equal in all directions, and does depend on gravitational field

found it on google so it could be wrong

Answer:

True

Explanation:

I took a quiz and got it right

pls mark as brainliest.

Answer:

The CORRECT answer is Solution

Explanation:

Since a Colloid is a liquid like substance that cannot be removed from other solids the only possible choice would be a Solution. becuase with a solution you can drain the solution and still get the beans.

It is not possible for an element to have a mass number of 6, protons of 8, and neutrons of 6. These values violate the basic principles of atomic structure and are not possible for any known element.

As per the question given,  

It is not possible for an element to have a mass number of 6, protons of 8, and neutrons of 6, as this violates the basic principles of atomic structure. The mass number of an atom is the sum of its protons and neutrons, so a mass number of 6 and 6 neutrons would imply the atom has 0 protons, which is not possible.

It's possible that the question may have a mistake in it or there may be missing information. If you have any additional information or context for the question, please let me know and I can try to provide a more complete answer.

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Explanation:

Let compound X be 100g.

Molar mass of carbon = 12g/mol

Moles of C in compound X = 54.54/12 = 4.54mol.

Molar mass of hydrogen = 1g/mol

Moles of H in compound X = 9.09/1 = 9.09mol.

Molar mass of oxygen = 16g/mol

Moles of O in compound X = 36.37/16 = 2.27mol

Ratio of C:H:O = 4.54:9.09:2.27 = 2:4:1.

Hence, the empirical formula of X is C2H4O.

A compound X contains carbon, hydrogen and oxygen only X contains 54.54% of carbon by mass, 9.09% of hydrogen by mass and 36.37% of oxygen by mass therefore, the empirical formula of X is C₂H₄O.

The term empirical formula is defined as the formula of a chemical compound is the simplest whole number ratio of atoms present in a compound. CH₄ is the empirical formula of methane compound.

Given that compound X  is 100g.

Molar mass of carbon is 12g/mol

Moles of Carbon in compound X

= 54.54 / 12

= 4.54mol.

Molar mass of hydrogen is 1g/mol

Moles of Hydrogen in compound X

= 9.09 / 1

= 9.09mol.

Molar mass of oxygen is 16g/mol

Moles of Oxygen in compound X

= 36.37 / 16

= 2.27mol

Ratio of C:H:O

= 4.54:9.09:2.27

= 2:4:1.

Hence, the empirical formula of X is C₂H₄O.

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Answer:

fermentation of crops that are high in sugar (starch) or fat into ethanol,

Explanation:

Explanation:

V1/T1 = V2/T2      T  must be in Kelvin

12.78 / (-50 + 273.15)  =  V2 / ( 28+ 273.15)

V2 = 17.25 L

The pH of a buffer solution can be calculated by using the Henderson-Hasselbalch equation. According to the problem, a buffer with a pH of 4.35 contains 0.37 M of sodium benzoate and 0.26 M of benzoic acid. Therefore, we can say that the pKa of benzoic acid is 4.20.

Calculate the number of moles of sodium benzoate and benzoic acid in 1.7 L of buffer solution:moles of sodium benzoate = 0.37 M x 1.7 L = 0.629 molesmoles of benzoic acid = 0.26 M x 1.7 L = 0.442 molesAccording to the balanced equation, 1 mole of HCl reacts with 1 mole of H3O+. Therefore, if 0.056 moles of HCl is added to the buffer solution, the number of moles of H3O+ that is formed is also 0.056 moles. The final volume of the solution is 1.7 L. Therefore, the new concentration of the buffer solution can be calculated by using the equation: C1V1 = C2V2, where C1 and V1 are the initial concentration and volume, and C2 and V2 are the final concentration and volume. Thus,C2 = (C1V1 + n) / V2where n is the amount of acid or base added.

Calculate the new concentration of the buffer solution: moles of sodium benzoate = 0.629 moles of benzoic acid = 0.442 moles of H3O+ formed = 0.056 moles. The total number of moles of acid and salt in the buffer is 0.629 + 0.442 = 1.071 moles. The total volume of the buffer is 1.7 L + 0.056 L = 1.756 L. The new concentration of the buffer can be calculated: C2 = (1.071 + 0.056) / 1.756= 0.631 M. Now, we can use the Henderson-Hasselbalch equation to calculate the new pH of the buffer:pH = pKa + log([A-] / [HA])pH = 4.20 + log(0.37 / 0.26)pH = 4.32. Therefore, the concentration of [H3O+] in the solution after the addition of 0.056 mol HCl to a final volume of 1.7 L is 2.29 x 10^-5 M (or 2.3 x 10^-5 M, to two significant figures).

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In general, changes in rock formations can occur due to a variety of factors, including weathering, erosion, tectonic activity, and sedimentation.

What is Rock Formation?

Rock formation refers to the process by which rocks are created, transformed, or modified over time through various geological processes. This process involves the deposition of sediments, the consolidation and hardening of sediments into rock layers, and the metamorphism of existing rocks due to heat, pressure, and other factors.

There are three main types of rocks: igneous, sedimentary, and metamorphic. Igneous rocks form from molten magma or lava that cools and solidifies, while sedimentary rocks are formed from the accumulation of sediments, such as sand, mud, and organic material. Metamorphic rocks are formed from the transformation of existing rocks under high heat, pressure, and chemical reactions.

Weathering and erosion can cause rocks to break down and change shape over time, while tectonic activity can cause rocks to shift and deform. Sedimentation can lead to the formation of new rock layers on top of existing ones.

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If all the hydrogen gas in the fuel tank is burned, 1.65 kg of water vapor will be produced.

The balanced chemical equation for the combustion of hydrogen gas is: 2H₂ + O₂ → 2H₂O

From this equation, we can see that two moles of hydrogen gas (H₂) react with one mole of oxygen gas (O₂) to produce two moles of water vapor (H₂O).

To determine the mass of water vapor produced, we need to use the ideal gas law to calculate the number of moles of hydrogen gas in the fuel tank:

PV = nRT

where P = 20.0 atm, V = 150.0 L, n is the number of moles, R is the gas constant (0.08206 L atm/mol K), and T = 298 K (25°C + 273.15).

Solving for n, we get:

n = PV/RT = (20.0 atm)(150.0 L)/(0.08206 L atm/mol K)(298 K) = 91.27 mol H₂

Since two moles of H₂ produce two moles of H₂O, the number of moles of water vapor produced is also 91.27 mol.

Finally, we can calculate the mass of water vapor using its molar mass (18.015 g/mol):

mass of H₂O = (91.27 mol)(18.015 g/mol)

= 1645.24 g or 1.65 kg

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Pyramid of energy has not an advantage: B. Assigning the decomposers and detritivores to a particular trophic level.

Pyramid of energy is a graphical representation of the amount of energy at each trophic level of a food chain (see the picture below).

The bottom level represents the producers, followed by primary, secondary and tertiary consumers.

The decomposers and detritivores do not have a particular trophic level.

Decomposers break down dead plants and animals into simpler inorganic substances.

Detritivores are organisms, for example a fungus or an earthworm, that are decomposing organic matter.

Decomposers have very important role in the circle of life.

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Answer:

b. Assigning the decomposers and detritivores to a particular trophic level.

Explanation:

Answer:

the volume of the same gas at pressure of 1.00atm =737.3ml

The equilibrium constant of the reaction from the calculation that has been done is 0.154

The concentrations (or partial pressures) of reactants and products in chemical equilibrium for a specific chemical reaction are related by the equilibrium constant (K), a mathematical equation. It quantifies the degree to which an equilibrium has been reached in a reaction.

We have the equation of the reaction as;

A(g) + B(g) ⇔C(g)

Thus;

Keq = 45.83/11.23 * 26.50

Keq = 0.154

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1) Convert grams to moles

The molar mass of Cu is 63.546 g/mol.

0.007553 mol of Cu is equal to 7.6*10^-3 mol of Cu.

.

The balanced chemical equation for the acid-base reaction is:

2HCl + Ca(OH)2 → CaCl2 + 2H2O

A balanced chemical equation is a representation of a chemical reaction that shows the relative number of reactant and product molecules involved. It follows the law of conservation of mass, which states that matter cannot be created or destroyed in a chemical reaction. In a balanced equation, the number of atoms of each element on both sides of the equation is equal.

A balanced chemical equation includes chemical formulas of reactants on the left side of the arrow and the chemical formulas of products on the right side. Coefficients are used to balance the equation by adjusting the number of molecules or moles of each substance involved. These coefficients indicate the relative stoichiometric ratios between reactants and products.

According to the equation, for every 1 molecule of CaCl2 that forms, 2 water molecules are produced. Therefore, the correct answer is:

twice as many, 2x

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Answer:

when it comes to adding or subtracting numbers, his final answer should have the same number of decimal places as the least precise value.

For example if you add 2 numbers; 10.443 + 3.5 , 10.443 has 3 decimal places and 3.5 has only one decimal place.

Therefore 3.5 is the less precise value.

So when adding these 2 values the final answer should have only one decimal place.

after adding we get 13.943 but it can have upto one decimal place. then the second decimal place is less than 5 so the answer should be rounded off to 13.9.

the answer is the same number of decimal places as the least precise value

Explanation:

I think this is the answer I'm not sure

Answer: the same number of decimal places as the least precise value

Explanation:

There are 20 positions with the amino acids the same between the two species. Those are 6, 7, 9, 11, 12, 14, 16, 18, 19, 23, 28, 30, 36, 37, 38, 47, 50, 51, 53, and 54.

Amino acids are defined as the molecules that combine to form proteins. Amino acids said as the building blocks of life. The human body uses amino acids to make proteins to help the body to break down the food. There are 12 amino acids. Those are isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, valine, cysteine, tyrosine, histidine and arginine. These are the organic compounds which contain both amino and carboxylic acid functional groups. There are 20 positions with the amino acids of same species.

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The complete question is,

How many positions are the amino acids the same between the two species?