what is delta.hrxn for the equation below? naoh(aq) hcl(aq) right arrow. h2o(l) nacl(aq) delta.hrxn

Answer:

Explanation:

mass of 1mole of brick =  mass of 1 brick x avagadro number

= 4 kg x 6.022 x 10^23 bricks  = 2.4 x 10^24 kg

No. of moles of bricks have a mass equal to the mass of the earth

= mass of earth / mass of 1 mole of brick

= [ 6 x 10^27 ]  /  [ 2.4 x 10^24 ]

= 2.5 x 10^3

= 2500 moles

Answer:

2

Explanation:

2 is correct because the number of charges on the nucleus increases, causing a stronger attraction for the bonding of electrons (and thus greater electronegativity).

Answer:

B

Explanation:

The compound corresponds to a molecule AX4E where A is the Central atom, X are the other atoms present and E is the lone pair of electrons.

The shape of this molecule is based on a trigonal bipyramid since the molecule contains five electron domains.

Since there are four bond pairs and one lone pair, the molecular geometry is see-saw with equatorial bond angle <120° and axial bond angle <90°.

For AX4E (five electron pairs), the lone pair should occupy an equatorial position instead of an axial position since the equatorial position has two neighboring electron pairs that are positioned at about 90° apart from each other and two other neighboring electron pairs that are positioned at 120° from each other. The axial position has 3 neighboring electron pairs positioned at 90° from each other and another neighboring electron pair positioned at 120°. Hence the equatorial position experiences lesser repulsion compared to the axial position.

Hence in the structure pictured in the question, position B is a preferred position for the lone pair instead of position A.

Answer:

Earth has layers because of density. Dense materials such as iron sank to the middle of the Earth, the center of its gravity. Less dense materials stayed at the top.

Explanation:

hope this help:)

The answer to the question, How does density affect the organization of earth is A : The densest material is closest to the center

The earth is made up of different layers namely,

Each layer goes from topmost to inner most and the density of each layer increases as we moves closer to the center of the earth.

So, the densest material is closest to the center.

So, the answer to the question, How does density affect the organization of earth is A : The densest material is closest to the center

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56 ml of water is displaced on submerging a book having volume of 56 cm³.

If a body is considered which is completely submerged, the volume which it will displace will be equal to volume of the body.If it is partially submerged,volume of fluid displaced will be equal to the volume of the part which is submerged.This is in accordance with the Archimedes' principle.

The Archimedes' principle can be stated as the upward buoyant force which is exerted on a body irrespective whether the body is partially or fully submerged  is equal to the weight of fluid which is displaced by it.

Thus,56 cm³ of water will be displaced on submerging the book into water as the book will be completely submerged.

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Answer:

C

Explanation:

The polysaccharide is starch which contains many glucose molecules.

The rest are either monosaccharide or disaccharides.

Starch is a carbohydrate which is a polysaccharide and not a simple sugar like glucose, fructose,etc.

A carbohydrate is defined as a bio-molecule which consists of carbon,hydrogen and oxygen atoms which are usually in the ratio of 2:1 with the empirical formula C\(_n\)(H₂O)\(_n\).

This term is most commonly used in biochemistry as a synonym of saccharide which is a group of sugars, starch and cellulose.

They perform various functions in living organisms. They serve as an energy source and as well as structural components . They are a key component in providing nutrition and are found in wide variety of natural as well as processed foods.

Carbohydrates occur as cellulose in the cell walls of plants and is one of the components of insoluble dietary fibers.

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Metal of the following surfaces does NOT absorb moisture.

The correct option is B.

The presence of a liquid, things like water, even in minute amounts, is referred to as moisture. Examples of locations where small amounts of water can be found include the air (humidity), foods, and some commercial goods. The amount of water vapor in the atmosphere is also alluded to as moisture.

Warm, moist weather that comes in touch with a cool surface, such uninsulated cold water mains, causes moisture to condense into water droplets. Numerous other represent the lowest including cooking, taking a bath, drying clothing, washing the dishes, and others also release moisture into the air.

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The complete question is -

Which of the following surfaces does NOT absorb moisture? *

A-Cardboard

B- Metal

C-Magazine cover

D-Rough wood

Answer:

firstly:scientist communicate with each other to share what they learn

secondly; they question and check each other's work

Answer:

Forming a hypothesis

Explanation:

Cuz why not

The pH of the resultant solution at 25°C is approximately 1.62.

To find the pH of the resultant solution, we'll need to follow these steps:
1. Calculate the moles of HCl and HClO4 in the individual solutions:
- Moles of HCl = (Volume × Molarity) = (0.3 L × 0.03 M) = 0.009 mol
- Moles of HClO4 = (Volume × Molarity) = (0.5 L × 0.02 M) = 0.01 mol

2. Calculate the total volume of the mixture:
Total volume = 300 mL + 500 mL = 800 mL = 0.8 L

3. Calculate the combined moles of H+ ions:
Total moles of H+ ions = Moles of HCl + Moles of HClO4 = 0.009 mol + 0.01 mol = 0.019 mol

4. Calculate the concentration of H+ ions in the mixed solution:
[H+] = (Total moles of H+ ions) / (Total volume) = 0.019 mol / 0.8 L = 0.02375 M

5. Use the pH formula to find the pH of the solution at 25°C:
pH = -log10[H+] = -log10(0.02375) ≈ 1.62

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The ionization constant Ka of the acid is 1 x 10^-7

Define weak acids .

When an acid cannot fully perform the dissociation process when dissolved in an aqueous solution, it is categorized as a weak acid. Formic acid and hydrofluoric acid are two examples of such acids.

Given:

Molarity = 0.10M

pH = 4

Consider acid as HA

Reaction can be written as HA ⇋  H+  + A-

Constant, Ka is [H+] [A]/ [HA]

Taking [H+]  and [A] as 'x'

Ka will be x*x/ 0.10-x

We know pH is -log[H]

[H] will be 10^-4 i.e 'x'

Ka will now become (10^-4 * 10^-4)/ 0.1-10^-4 i.e. 10^-7

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Answer:

5g NaOH

Explanation:

The number of molecules in 37.93g of magnesium nitrate will be : 0.2568 mol * 6.022x10^23 molecules/mol = 1.55x10^24 molecules.

To determine the number of molecules in a 37.93 gram sample of magnesium nitrate, you would need to know the molar mass of the compound. Magnesium nitrate has a molar mass of 148.31 g/mol.

we can use the formula:

Number of moles = mass (in grams) / molar mass (in g/mol)

Number of moles = 37.93 g / 148.31 g/mol = 0.2568 mol Avogadro's number (6.022x10^23) is the number of atoms, ions, or molecules in one mole of a substance. Therefore, the number of molecules in 37.93g of magnesium nitrate will be : 0.2568 mol * 6.022x10^23 molecules/mol = 1.55x10^24 molecules.

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Answer:

the concentration of the reactants

the temperature in heating

The variable that should be kept constant is the concentration of the reactant and the temperature in heating.

Hydrochloric acid (HCl) is called as the muriatic acid represent the colorless corrosive, also the mineral acid should be strong that contains various industrial used also it should be reacted with an organic base it created the hydrochloride salt.

Therefore, we can conclude that The variable that should be kept constant is the concentration of the reactant and the temperature in heating.

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Gold is an element that belongs to the periodic table.Elements are the simplest form of substances that can exist, and they cannot be divided into simpler substances by chemical methods. Each element is defined by the number of protons present in the atomic nucleus.

Gold is an element that has 79 protons and is represented by the symbol Au.Gold has several properties that distinguish it from other elements. It is a soft, shiny, dense metal with excellent conductivity. Gold is also a noble metal, meaning it is resistant to corrosion and oxidation and does not react with most acids. Its properties have made it useful for many purposes, including jewelry, currency, and electronics.

Heterogeneous mixtures contain two or more substances that are not uniformly distributed and can be separated by physical means. Solutions are homogeneous mixtures composed of a solute dissolved in a solvent. Compounds are substances composed of two or more elements chemically combined in a fixed ratio. Thus, none of these classifications accurately describes gold.

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Explanation:

Water is a liquid, it is same as the oceans water, but, swimming pool water contains Flourine (F) or Chlorine (CI) to clean it up, scinece there is no way that the water moves.

This quantity may be expressed in scientific notation as 6.25 x 106 milliliters.

 You can convert the number of quarts to liters using the conversion factor in order to determine the number of milliliters in a family pool that contains 25,000 quarts of water. 0.25 liters are contained in 1 quart.

This means that 6,250 liters are equal to 25,000 quarts, or 25,000 * 0.25.

The conversion factor can then be used to convert liters to milliliters. Milliliters are equivalent to one liter. Accordingly, 6,250 liters are equivalent to 6,250 * 1,000, or 6,250,000 milliliters.

This quantity may be expressed in scientific notation as 6.25 x 106 milliliters.

It is frequently used to convey extremely big or extremely small values. In this instance, scientific notation enables us to express the volume of the family pool in a more condensed and readable manner.

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Answer:

the answer is  D

Explanation:

brainliest?

When the tree species was preserved as a fossil in the Arizona desert, the environment was likely different compared to the present. Based on the fact that the tree species is now extinct, infer that the conditions that supported its existence have significantly changed.

In the past, the environment where the tree lived may have had different climatic conditions, such as temperature, precipitation patterns, and humidity levels. It may have been part of a specific ecosystem or habitat that provided suitable resources for the tree's growth and survival. The tree species may have had adaptations that allowed it to thrive in that particular environment.

The extinction of the tree species may have had cascading effects on other living things that were associated with it. For example, other plant species that relied on the tree for shade or as a host for epiphytic growth might have also suffered or disappeared. Similarly, animals that depended on the tree for food, shelter, or nesting sites could have been affected by its extinction.

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Answer:

(C3H4O3) x 2 = C6H8O6, the molecular formula for Vitamin C.

Answer:

ΔG°rxn = 28.4kJ/mol at 600K

Explanation:

Using Hess's law, you can find the ΔH°rxn and S°  subtracting ΔH°f of products - ΔH°f of reactants ×its coefficients. In the same way for S°rxn

For example, for the reaction:

aA + bB → cC:

ΔH°rxn = c×ΔH°fC - (a×ΔH°fA + b×ΔH°fB).

S°rxn = c×S°fC - (a×S°fA + b×S°fB).

For the reaction:

SO₂(g) + Cl₂(g) → SO₂Cl₂(g)

ΔH°rxn = 1×ΔH°f{SO₂Cl₂} - (1×ΔH°fSO₂ + 1×ΔH°fCl₂).

S°rxn = 1×S°f{SO₂Cl₂} - (1×S°fSO₂ + 1×S°fCl₂).

As at 298K:

ΔH°f{SO₂Cl₂} = -364.0kJ/mol

ΔH°f{SO₂} = -296.8kJ/mol

ΔH°f{Cl₂} = 0kJ/mol

ΔH°rxn = 1×{-364.4kJ/mol} - (1×-296.8kJ/mol + 1×0).

ΔH°rxn = -67.2kJ/mol at 298K.

S°f{SO₂Cl₂} = 311.9J/molK

S°f{SO₂} = 248.2J/molK

S°f{Cl₂} = 223.0J/molK

S°rxn = 1×{311.9J/molK} - (1×248.2J/molK + 1×223.0J/molK).

S°rxn = -159.3J/molK = -0.159.3KJ/molK

Using:

ΔG°rxn = ΔH°rxn - S°rxn×T

Assuming ΔH°rxn doesn't change at 600K:

ΔG°rxn = -67.2kJ/mol - -0.159.3J/molK×600K

Answer:

the steak I ate because its protein

Explanation:

1 ) first u have to balance the equation but in this case it is already balanced.

2) checking for the limiting reactant:

13 mol O2 × (1mol H2O / 1mol of O2) = 13 mol of H2O

14 mol of ethanol × (1mol H2O/ 1molof ethanol) = 14 mol of H2O

the less amount of moles produced from the O2 so the limiting reactant is oxygen

3) calculating the products moles

13 mol O2 × (1mol H2O / 1mol of O2) = 13 mol

13 mol O2 × (1mol Ch3Cooh / 1mol O2) = 13 mol

note: the ratios obtained from the balanced equation

4) the excess reagent is the ethanol 1 mol will be remain

Answer:

6.3 moles of water = 6.3*18=113.4 grams per mole

Explanation:

The gas that accounts for 91% of the Sun's mass is hydrogen.

Hydrogen is the lightest and simplest element, consisting of only one proton and one electron. It is the most abundant element in the universe and is found in stars, including the Sun, where it is converted into helium through nuclear fusion.

In fact, the Sun's energy is derived from the fusion of hydrogen into helium in its core. This process releases an enormous amount of energy in the form of light and heat, which is what allows the Sun to emit light and warmth to Earth.

Hydrogen's abundance and its role in the Sun's fusion process make it the most significant gas in the Sun's mass.

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Answer:

you will get 17.983 g of lithium for every 100 g of lithium phosphate.

Explanation:

69.7%  is the percent by mass of Lithium in  Li\(_3\)PO\(_3\). A percent is obtained by multiplying the result by 100.

One approach to show the concentration for an element within a compound or component in a combination is as a mass percentage. The mass percentage is computed by dividing the total weight of the combination by the mass of each component and multiplying the result by 100%. The mass percent is calculated by dividing the mass that contains the compound and solute by the mass for the element or solute.

99.795g/mol = molar mass of  Li\(_3\)PO\(_3\)

6.94g/mol = molar mass of Li

mass percentage of Li=(molar mass of Li/molar mass of Li\(_3\)PO\(_3\))×  100

=(6.94/99.7)×  100

=69.7%

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It represents the time it takes for half of the material to decay to a daughter element.

The half-life of a radioisotope represent the time it takes for half of the material to decay to a daughter element (Option B)

This is the time taken for half a material to decay. The longer the half-life of an element, the more stable the element.

If the initial mass of an element is 100 g and after a particular time (say 72 minutes) the mass of the element is now 50 g.

Therefore, the time 72 minutes is called the half-life of the element because that is the time taken for half the element to decay.

With the above information in mind, we can conclude that the correct answer to the question is:

Option B. It represents the time it takes for half of the material to decay to a daughter element.

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An 8.638.63 g sample of calcium sulfide was decomposed into its constituent elements and the statement is that every sample of calcium sulfide will have 44.4% mass of sulfur.

According to the law of definite proportions, which is also known as the law of constant composition, pure compound samples always contain the same elements in the same mass proportion.

Stoichiometry in chemistry is also based on this concept and also the law of multiple proportions.

Every sample of a given chemical composition will consist of the same elements in the same combination or ratio.

It is given that,

an 8.638g sample was decomposed into its constituents.

It is producing a total of 4.804g calcium and 3.833g of sulfur.

The mass ratio of Ca: s = 4.804/3.833

=1.253

⇒ mass of calcium = 40.078

mass of sulfur = 32.068

Total mass of CaS = 72.146 grams

mass percentage of Ca = 40.078/72.146 x 100

=55.56%

mass percentage of S = 32.068/72.146 x 100

=44.44%

Thus, in each kind of sample the mass percentage of calcium along with sulfur in every sample is equal to 100%.

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Complete Question

A 8.63 gg sample of calcium sulfide was decomposed into its constituent elements, producing 4.804 g of calcium and 3.833 g of sulfur.

Which of the statements are consistent with the law of constant composition (definite proportions)?

A) Every sample of calcium sulfide will have 3.36 g of calcium.

B) The mass ratio of Sto Ca in every sample of calcium sulfde is 0.80.

C) The ratio of calcium to sulfur will vary based on how the sample was prepared.

D) Every sample of calcium sulfide will have 44.4% mass of sulfur.

E) The mass percentage of calcium plus the mass percentage of sulfur in every sample of calcium sulfide equals 100%.

The statement is FALSE. Non-ferrous metals can be hardened by heat treatment, although the mechanisms and processes involved may differ from ferrous metals.

Heat treatment techniques such as precipitation hardening can be used to increase the strength of non-ferrous metals. Non-ferrous metals are metals or alloys that do not include iron (or iron allotropes, such as ferrite, etc.) in significant quantities. Non-ferrous metals are employed because they have desired qualities like reduced weight (for example, aluminium), greater conductivity (for example, copper), non-magnetic characteristics, or corrosion resistance (for example, zinc), even though they are often more expensive than ferrous metals. In the iron and steel sectors, several non-ferrous materials are also employed. Bauxite, for instance, is used as a flux in blast furnaces, whereas wolframite, pyrolusite, and chromite are utilised to create ferrous alloys.

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Answer:

Explanation:

The most stable conformation of a structure is the global energy minimum.

Local and global energy minima are terms used in conformational analysis, which is the study of the different stable arrangements or conformations a molecule can adopt.

Conformational analysis involves exploring the different possible arrangements of atoms in a molecule while considering the rotation of bonds. Each conformation has a specific energy associated with it, which reflects the stability of that particular arrangement. The goal of conformational analysis is to identify the most stable conformations of a molecule.

A local energy minimum refers to a conformation that has the lowest energy within a limited region of the conformational space. It is relatively stable compared to other conformations nearby, but it may not necessarily be the most stable conformation in the entire conformational space. Calculating local energy minima requires considering the energy of neighboring conformations and comparing them to identify the lowest energy state.

A global energy minimum refers to the conformation that has the lowest energy over the entire conformational space. It is the most stable conformation among all the possible arrangements that a molecule can adopt. Finding the global energy minimum typically requires an extensive search of the conformational space using advanced computational methods or experimental techniques.

Understanding local and global energy minima is crucial in conformational analysis as it helps determine the most stable conformations of a molecule. Local energy minima provide insights into the energy landscape around a given conformation, while the global energy minimum represents the most thermodynamically stable conformation. Identifying these energy minima aids in understanding the molecule's properties, behavior, and interactions, which are important for various applications such as drug design, material science, and understanding molecular structure-function relationships.

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