In what type of climate do trees produce narrower rings?
A.) cool and dry
B.) warm and wet
C.) cool and wet
D.) warm and dry

Correct Answer is; A.

Answer:

ΔH = -470.4kJ

Explanation:

It is possible to sum 2 or more reactions to obtain the ΔH of the reaction you want to study (Hess's law). Using the reactions:

1. CaC2(s) + 2H2O(l) → C2H2(g) + Ca(OH)2(s)ΔH = −414kJ

2. 6C2H2(g) + 3CO2(g) + 4H2O(g) → 5CH2CHCO2H(g)ΔH = 132kJ

6 times the reaction 1.

6CaC2(s) + 12H2O(l) → 6C2H2(g) + 6Ca(OH)2(s)ΔH = −414kJ*6 = -2484kJ

This reaction + 2:

6CaC2(s) + 3CO2(g) + 16H2O(l) →  + 6Ca(OH)2(s) + 5CH2CHCO2H(g) ΔH = -2484kJ + 132kJ = -2352kJ

As we want to calculate the net change enthalpy in the formation of just 1 mole of acrylic acid we need to divide this last reaction in 5:

6/5CaC2(s) + 3/5CO2(g) + 16/5H2O(l) →  + 6/5Ca(OH)2(s) + CH2CHCO2H(g) ΔH = -2352kJ / 5

29 is not the best answer depends on the context and the rules for significant figures.

What is best answer?

The best answer depends on the context and the rules for significant figures. If we assume that we need to round to three significant figures:

Therefore, 29 is not the best answer.

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Answer:

0.623 moles of C2H6

Explanation:

Divide by Avogadro's number (6.022x10^23)

The volume of 12 gas forms when 21 L Cl2 react at STP is 21 L.

To determine the volume of 12 gas (I assume you mean I2 gas) formed when 21 L of Cl2 reacts at STP (standard temperature and pressure), we need to use the ideal gas law equation.

The ideal gas law equation is given by:

PV = nRT

Where:

P = pressure

V = volume

n = number of moles

R = ideal gas constant

T = temperature

At STP, the pressure is 1 atm, and the temperature is 273.15 K.

From the balanced equation, we can see that the molar ratio between Cl2 and I2 is 1:1. So, if 21 L of Cl2 reacts, it will produce an equal volume of I2 gas.

Given that the volume of Cl2 is 21 L, we can assume the volume of I2 gas formed will also be 21 L.

Therefore, the volume of I2 gas formed is 21 L.

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N2(g) + 3H2(g) 2NH3 is the reaction's balanced equation (g)

The equation for the reaction's equilibrium constant, k, is k = [NH3(g)]2 / [N2(g)].[H₂(g)]

The concentrations in the sample are in an equilibrium state. So, we may just utilize those in the computation.

0.184 mol/L= [NH3(g)]

0.551 mol/L= [N2(g)]

0.4 mol/L= [H2(g)]

Applying the equation, k = (0.184 mol/L)2 / ((0.551 mol/L) x (0.400 mol/L)3), yields k = 0.960 mol2 L2.

As a result, the reaction's equilibrium constant at 500 °C is 0.960 mol2 L2

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The balanced nuclear equation for the beta decay of 234/90Th can be represented as follows: ^234/90Th --> ^234/91Pa + e^0/-1β

In this equation, the nucleus of thorium-234 (234/90Th) undergoes beta decay. During beta decay, a neutron within the nucleus is converted into a proton, resulting in the emission of an electron (beta particle). As a result, the thorium-234 nucleus is transformed into protactinium-234 (234/91Pa) by gaining one proton.

The beta particle emitted during the decay process is represented as e^0/-1β, where the superscript 0 denotes that the electron has no charge (neutral), and the subscript -1 indicates that the electron carries a negative charge of -1.

It is important to note that in a nuclear equation, the total atomic mass and atomic number on both sides of the equation must be equal to maintain a balanced equation and conserve mass and charge.

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Answer:

Chromosomes are made of DNA

Explanation:

The relationship between chromosomes and DNA is such that chromosomes are made up of DNA.

DNA is deoxyribonucleic acid. It is the main component of the chromosome and basic ingredient for hereditary.

The DNA holds complete sets of instructions that helps control life processes. The chromosome acts as the store house for holding the DNA.

During cell division and reproduction, the chromosomes play very important roles in determining what a person inherits.

Answer:

Chromosones are made of DNA

Explanation:

Answer:

A balanced chemical equation represents a chemical reaction that obeys the Law of Conservation of Mass (Matter). It can be thought of as describing how many atoms or molecules of reactants are consumed in order to produce a certain number of atoms or molecules of products.

The correct option is C. Friction is the force that keeps your tires from sliding around on the road.

Friction is the force exerted by a surface when an object moves across it. It always acts in the opposite direction of the movement of the object. That is it resists the movement of the object and if there's no force acting on the moving object, the frictional force will eventually stop the motion of the object.

In absence of friction the tires of the vehicles and even humans would not have been able to cover a distance without slipping and falling.

Therefore, the correct option is C. Friction is the force that keeps your tires from sliding around on the road.

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Approximately 90.6 g of K₂Cr₂O₇ would precipitate out of the solution when cooled from 80°C to 20°C.

To determine how much solute will precipitate out of a solution of potassium dichromate (K₂Cr₂O₇) when cooled from 80°C to 20°C, we apply the following method:

At 80°C:

Initial amount of K₂Cr₂O₇ = 100 g/L

At 20°C:

Solubility of K₂Cr₂O₇ = 9.4 g/L

Amount of K₂Cr₂O₇ that would remain in solution at 20°C = 9.4 g/L x 1 L = 9.4 g

Therefore, the amount of K₂Cr₂O₇ that would precipitate out of the solution when cooled from 80°C to 20°C would be:

Amount of K₂Cr₂O₇ that precipitates out = Initial amount - Amount that remains in solution at 20°C

Amount that precipitates out = 100 g - 9.4 g = 90.6 g

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The complete question is below:

When 100 g of k2cr2o7 in 1 liter of water is cooled from 80oc to 20oc, how much solute will precipitate out of the solution?.

Answer

a. Combustion Reaction

Explanation

C3H8 + 5O2 --> 3CO2 + 4H2O

The reaction above involves an organic compound combusting in the presence of oxygen to produce carbon dioxide and water. This type of reaction is known as a combustion reaction.

Answer:

\(P_{He}=9.06torr\)

Explanation:

Hello there!

In this case, we can identify the solution to this problem via the Dalton's rule because the partial pressure of helium is given by:

\(P_{He}=x_{He}P_T\)

Whereas the mole fraction of helium is calculated by firstly obtaining the moles and then the mole fraction:

\(n_{He}=8.00g\frac{1mol}{4.00g}=2.00mol\\\\ x_{He}=\frac{n_{He}}{n_{He}+n_{Ar}} \\\\ x_{He}=\frac{2.00mol}{2.00mol+8.60mol}\\\\x_{He}=0.189\)

Then, we calculate the partial pressure as shown below:

\(P_{He}=0.189 *48.0torr\\\\P_{He}=9.06torr\)

Best regards!

Answer:

mostly skin diseases

Explanation:

because of greenhouse effects

To identify the limiting reactant, excess reactant, and theoretical yield, we first need to determine the amount of each reactant in moles.

Using the molar masses of Ca and P:

Number of moles of Ca = 17.0 g / 40.08 g/mol = 0.424 mol

Number of moles of P = 18.0 g / 30.97 g/mol = 0.581 mol

Next, we need to determine the stoichiometric ratio of the reactants. From the balanced chemical equation, we see that the ratio of Ca to P is 3:2.

3 Ca + 2 P → Ca3P2

To use the stoichiometric ratio to determine the limiting reactant, we need to compare the actual ratio of the reactants to the stoichiometric ratio.

Actual ratio of Ca to P = (0.424 mol Ca) / (0.581 mol P) ≈ 0.73

Stoichiometric ratio of Ca to P = 3/2 = 1.5

Since the actual ratio is greater than the stoichiometric ratio, Ca is the excess reactant and P is the limiting reactant.

To find the theoretical yield of Ca3P2, we need to use the stoichiometric ratio to determine how many moles of Ca3P2 can be produced from the limiting reactant (P).

From the balanced chemical equation, we see that 2 moles of P react with 3 moles of Ca to produce 1 mole of Ca3P2.

So, the number of moles of Ca3P2 that can be produced from 0.581 mol of P is:

(0.581 mol P) × (1 mol Ca3P2 / 2 mol P) = 0.2905 mol Ca3P2

Therefore, the theoretical yield of Ca3P2 is 0.2905 mol.

Answer:

Solid

Explanation:

Molecules in solids only vibrate in place, while the other two have moving molecules

Answer:

1.E25 it is the answer the answer to mass of 1×10^25 molecules of water​

Explanation:

this is just EXPLINATION find your answer using this

first divide the number of molecules by Avogadro's number 6.022*10^25

you will

l get no. of Moles of water

multiply the no. of Moles with mass of 1 Mole of water 18g per mole

if get answer you comment

you should try on your own you will understand better

Answer:

Rock A will have far more chemical weathering than Rock B due to the rise in area effect

Explanation:

Rock A undergoes both Physical and Chemical weathering. So, thanks to physical weathering there'll appear cracks within the rock, which can, in turn, increase the area of rock on which weathering is occurring. So, Chemical weathering will happen much faster now as there's a rise in the area. within the case of Rock B, there's only chemical weathering therefore the increase in the area won't be that very much like compared to Rock A.

Answer:

1 mole = 6.02 x 1023 atoms

Explanation:

The reagent that can be used to convert nitrobenzene to m-nitrobenzenesulfonic acid is (A) H2SO3.

The conversion of nitrobenzene to m-nitrobenzenesulfonic acid involves the introduction of a sulfonic acid group (-SO3H) at the meta position of the benzene ring. This can be achieved by treating nitrobenzene with a sulfonating agent such as sulfuric acid (H2SO4) or sulfuryl chloride (SO2Cl2).

However, in the given options, only reagent (A) H2SO3 is a sulfonating agent. When nitrobenzene is treated with H2SO3, it undergoes sulfonation at the meta position to form m-nitrobenzenesulfonic acid. The reaction can be represented as follows:

NO2C6H5 + H2SO3 → NO2C6H4SO3H + H2O

None of the other reagents listed are capable of sulfonating nitrobenzene to form m-nitrobenzenesulfonic acid.

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You would recover 36.525g of NaCl after evaporating all of the water.

To find the grams of NaCl that would be recovered after evaporating all the water, we can use the following formula:

mass = moles * molar mass

Where:

Moles = Molarity * Volume

Molarity = 0.250 M

Volume = 2500.0 mL = 2.5 L

Molar mass of NaCl = 58.44 g/mol

mass = 0.250 M * 2.5 L * 58.44 g/mol

mass = 36.525 g

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Answer:

Liquid

Explanation:

A liquid can take the shape of its container.

Answer:

Liquid

Explanation:

In liquid state, molecules are very loose which allows them to flow (with cohesive bonds). This causes the molecules to take the shape of their container as they aren't packed tightly. The speed of these molecules is medium compared to the slow solid and fast gas phases :)

Answer:

+1

Explanation:

Na₂O₂

NOTE: the oxidation number of oxygen is always –2 except in peroxides where it is –1.

Thus, we can obtain the oxidation number of sodium (Na) in Na₂O₂ as illustrated below:

Na₂O₂ = 0 (oxidation number of ground state compound is zero)

2Na + 2O = 0

O = –1

2Na + 2(–1) = 0

2Na – 2 = 0

Collect like terms

2Na = 0 + 2

2Na = 2

Divide both side by 2

Na = 2/2

Na = +1

Thus, the oxidation number of sodium (Na) in Na₂O₂ is +1

A cup of iron pieces.

WHY?

A cup of water is a pure substance, therefore, it would have less molecules than the cup of iron pieces.

Answer:

water

Explanation:

the salt dissapears and turns

into vapor

Answer:

A solution is made when a solid (which we call a solute) dissolves into a liquid (that we call the solvent) one example of a solution is salt dissolved in water. The salt and water can be separated again by evaporation (the water will evaporate if left in a got place leaving the salt behind. I don't know if that was the answer that you were looking for

Because HCl is a stronger acid than acetic acid, the pH of 0.01M acetic acid has greater value than the pH of 0.01M HCl. 2.88 is the  pH of a 0.01 M acetic acid.

Any hydrogen that comprises a material capable of giving a proton (a hydrogen ion) to another chemical is defined as acid. A base is indeed a molecule or ion that can receive a hydronium ion from just an acid.

1)Because HCl is a stronger acid than acetic acid, the pH of 0.01M acetic acid has greater value than the pH of 0.01M HCl. The pH value of stronger acid is lower.

2)CH\(_3\)COOH + H\(_2\)O  ⇄ CH\(_3\)COO⁻+  H\(_3\)O⁺

 0.01             0               0

 -x              +x                +x

 0.01-x           +x        +x

Ka=[ CH\(_3\)COO⁻][H\(_3\)O⁺]/[CH\(_3\)COOH]

1.8×10⁻⁵ = [x][x ]/[  0.01-x ]

x=1.34×10⁻³

pH = -log[H⁺]

     =  -log[1.34×10⁻³]

     =2.88

Therefore, because HCl is a stronger acid than acetic acid, the pH of 0.01M acetic acid has greater value than the pH of 0.01M HCl. 2.88 is the   pH of a 0.01 M acetic acid.

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A molecule of water contains hydrogen and oxygen in a 1:8 ratio by mass. this is a statement of the law of constant composition. Option B.

A water molecule is composed of hydrogen atoms and oxygen atoms bonded in a 2:1 ratio. Due to their fixed mass ratios, water molecules obey the law of constant proportions. Another example of a compound that obeys the law of constant ratios is methane.

To illustrate this, consider the production of water from molecular oxygen and hydrogen. Therefore mass is conserved. Conservation of mass can be used in chemical calculations. The law of conservation of mass states that matter cannot be created or destroyed.

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The features that are shared by the rocks include the melting and cooling of rocks.

It should be noted that a rock simply means a relatively hard naturally occurring mineral material.

Crystals most often form in igneous and metamorphic rocks. The processes that these rocks share that likely promote the formation of crystals is the melting and cooling of rocks.

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