Consider the chemical equations shown here.


P4(s)+3O2(g)--->P4O6(s) ΔH1 = -1,640.1 kJ
P4O10(s) → P4(s) + 5O2(g) ΔH2 = 2,940.1 kJ
What is the overall enthalpy of reaction for the equation shown below?

Round the answer to the nearest whole number.

P4O6(s) + 2O2(g) --->P4O10(s)

Answer:

\(p[H+] = 10.042\)

Explanation:

As we know that

\(pKw = pH + pOH\)......eq (1)

we will calculate the pH of OH- and then we will calculate the pH of H+

So p[OH-] \(= - log [1.10 * 10^{-4}]\)

Solving the right side of the equation, we get

p[OH-]

\(= - [-3.958]\\= 3.958\)

Now we know that

\(pKw = 14.0\)

Substituting the value of pOH in the above equation, we get -

\(14.0 = p[H+] + 3.958\\p[H+] = 14 - 3.958\\p[H+] = 10.042\)

Answer:

malleable

Explanation:

The image represent in malleable property of metal.

The image possibly represents the photoelectric effect of a metal, which is when it emits electrons after being exposed to electromagnetic radiation. Metals are also characterized by physical properties such as conductivity, malleability, metallic luster, and metallic bonding.

Based on your question, the image possibly represents the photoelectric effect, a key property of metals. This phenomenon occurs when a metal surface exposed to electromagnetic waves of a certain frequency absorbs radiation and emits electrons. These emitted electrons are called photoelectrons. Metals can also exhibit free electron model behavior, where electrons freely roam within the metal structure.

Metals possess unique physical properties like conductivity, malleability, and metallic luster. Malleability refers to the metal's ability to deform without breaking, while conductivity refers to the metal's ability to transfer heat or electricity. A metallic luster gives metals their characteristic shiny appearance.

Finally, metals are also known for their metallic bonding—a unique force that holds together the atoms within a metallic solid. Metallic bonding gives rise to many useful and varied bulk properties of metals.

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Answer:

need They need water, nutrients and sun

Both need to capture certain substances from the environment, with the only difference being the method they use. Thus, while animals ingest them with food, plants absorb them from the soil. This is the case of water and nutrients.

Hybridization in ethylene molecule (C2H4) occurs due to the overlapping of the two 2s atomic orbitals as well as one 2p atomic orbital of the two carbon atoms.

This overlapping produces four identical sp hybrid orbitals, each containing one electron from each carbon atom. Hybridization allows the bonding between the two carbon atoms, forming the carbon-carbon double bond. The sp2 hybridization of the carbon atoms results in the formation of a linear shape of the ethylene molecule.

The two unhybridized p atomic orbitals of the two carbon atoms lie perpendicular to each other. This results in the formation of a π bond between the two carbon atoms, as the electrons in the two unhybridized p orbitals can move freely between the two carbon atoms.

The linear shape of the ethylene molecule is due to the fact that the two sp2 hybrid orbitals of the two carbon atoms are oriented in opposite directions and are parallel to each other. The two hydrogen atoms are bonded to the carbon atoms through single covalent bonds, forming the carbon-hydrogen single bonds.

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The substrate is a cyclohexane ring. There will be six different alkenes produced when the cyclohexane ring is treated with a strong base.

What is alkenes?
Alkenes are a common family of hydrocarbons discovered in crude oil. There is at least one carbon-carbon double bond in this family. This double bond significantly alters the chemistry of the family's compounds.

Alkenes, and ethene in particular, play a crucial role in the chemical industry. They are created through the cracking of the alkanes but are not present in significant amounts in crude oil. Like all hydrocarbons, alkenes burn in the presence of air to produce carbon dioxide and water. Ethene reacts violently in oxygen, making it ineffective as a fuel. Additionally, the alkenes are too useful for the production of plastics and numerous other chemicals that are used as fuels in the chemical industry.

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The neutralization reaction is:

O2H 3PO4 + 3Ba(OH) 2 → 6H 2O+ Ba(PO 4)2

A neutralization reaction is a type of chemical reaction that occurs between an acid and a base, resulting in the formation of a salt and water.

In this reaction, the hydrogen ions (H+) from the acid react with the hydroxide ions (OH-) from the base to form water (H2O), which neutralizes the acidic and basic properties of the reactants. The remaining ions then combine to form a salt.

The general equation for a neutralization reaction is:

Acid + Base → Salt + Water

For this question, the chosen answer is the neutralization reaction  because an acid (H3PO4) and a base (Ba(OH)2) react to form water and a salt (Ba(PO4)2).

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When opposed to humid areas,  ground water will be deeper in arid areas. underground water source termed an confined aquifer is one in which an impermeable layer blocks the water's path to the surface the planet.

An aquifer that has restricting beds enclosing it on both the top and bottom is said to be confined. At substantial depths below the surface of the ground, confined aquifers typically exist.

Aquifers that are enclosed and filled with water are those that are found beneath the surface of the land. The aquifer is under pressure because of the impermeable layers that are both before and below it. As a result, when a well drills into the aquifer, water will rise over the top of the impermeable layers.

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The half-life of Polonium-210 is 417 days.

We know that the half-life of polonium is 139 days. This means that half of the original amount of polonium will disintegrate every 139 days. Now, suppose that the original amount of polonium is P0. After 139 days, half of the amount will be disintegrated. This means that the amount remaining is P0/2. Again, after another 139 days, half of the remaining amount will disintegrate. This means that the amount remaining will be P0/4. Similarly, after 3 half-lives, which is 3 x 139 = 417 days, the amount remaining will be:

P0/2³ = P0/8

This means that 7/8 of the original amount of polonium has disintegrated.

Therefore, 95% of the original amount has disintegrated after 139 days x (3 + 0.2)

half-lives = 417 days.

Therefore, the duration for which you will be able to use the polonium after the sample arrives is 417 days.

The question you wrote is incomplete, maybe the complete question is:

Polonium-210

The half-life of polonium is 139 days, but your sample will not be useful to you after 95% of the radioactive nuclei present on the day the sample arrives has disintegrated. For about how many days after the sample arrives will you be able to use the polonium?

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Answer:

0.085 kg

Explanation:

1 g=0.001 kg  OR 1 kg=1000 g

 so \(\frac{85}{1000}\)=0.085 kg

Answer:

its either A or B most likley A if im wrong then im sorry.

Explanation:

have a wonderfull day

There are 1000 millimeters in a meter. To convert 161 millimeters to meters, we need to divide by 1000:

161 millimeters ÷ 1000 = 0.161 meters

Therefore, 161 millimeters is equal to 0.161 meters.

In this question, we need to find the value of pressure of a 15 grams sample of CO2 gas, and in order to find this value, we will be using the Ideal gas law formula, which is the following:

PV = nRT

Where:

P = pressure in atm

V = volume in liters, 20 Liters

n = number of moles

R = gas constant, 0.082

T = temperature in kelvin, 0°C = 273 K

The number of moles we need to find based on the mass in the question and based on the molar mass of CO2, 44g/mol:

44g = 1 mol

15g = x moles

44x = 15

x = 15/44

x = 0.34 moles of CO2 in 15 grams

Now we have the values to add to the formula:

P * 20 = 0.34 * 0.082 * 273

20P = 7.61

P = 7.61/20

P = 0.38 atm of pressure

The pressure will be 0.38 atm

The specific heat capacity of water is 4.18 J/ °C g. 1500 ml of water is 1500 g thus the enthalpy change for a temperature difference of 24.2 to 25.9 degree Celsius is 10659 per mole or 1065.9 for 0.1 mol.

Calorimetry is an analytical tool used to determine the enthalpy change of a reaction. The calorimetric equation connecting the mass, temperature difference and specific heat capacity c is given by,

q = mc ΔT

Given that the volume of water is 1500 ml. Density of water is 1 g/ml thus mass of water is 1500 g. Specific heat capacity of water is  4.18 J/ °C g. Thus, the heat energy for the reaction taking place is calculated as follows:

q = 1500 g ×  4.18 J/ °C g × (25.9 - 24.2 °C)

  = 10659 J/mol

Hence, for 0.1 mol 10659  × 0.1 = 1065.9 J is the heat energy change for the reaction.

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In this equation, there are no fractional coefficients required, and the physical states of the reactants and products are indicated as per your instructions.

The balanced chemical equation for the reaction used to calculate ?H?f of MgCO3(s) is:

Mg(s) + CO2(g) + 1/2 O2(g) -> MgCO3(s)

This equation represents the formation of solid magnesium carbonate from its constituent elements magnesium, carbon dioxide, and oxygen. The coefficients in the equation indicate that one mole of magnesium, one mole of carbon dioxide, and one-half mole of oxygen are required to produce one mole of magnesium carbonate. The state of each substance is also indicated in the equation, with solid magnesium and solid magnesium carbonate denoted by (s), gaseous carbon dioxide denoted by (g), and gaseous oxygen denoted by (g). This balanced chemical equation can be used to calculate the standard enthalpy of formation of magnesium carbonate.

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Answer: approximately 15.1 grams.

Explanation: The key to chemistry is to change everything to moles. Then when you have the answer in moles change the answer back to grams, liters, or whatever you want. Change 25 grams of potassium chlorate to moles. Chlorate is Cl with 3 oxygens. ate = saturated. Chlorine has seven valance electrons when it is saturated six of these electrons are used by oxygen ( 2 electrons per oxygen) leaving only 1 electron. 1 K x 39 grams/mole+1 Cl x 35.4grams/ mole+3 O x 16 grams/ mole = 122.4 grams / mole Potassium Chlorate 25 122.4 = moles. 2.05 moles of Potassium Chlorate. There is a 1:1 mole ratio. 1 mole of Potassium Chlorate will produce 1 mole of Potassium Chloride. 2.05 moles of Potassium Chlorate will produce 2.05 moles of Potassium Chloride. Find the gram molecular mass of Potassium Chloride. 1 K x 39 = 39+1 Cl x 35.4 = 35.4 = 74.4 grams / mole. 2.05 moles x 74.4 grams/ mole = 15.2 grams

The mass of O₂ that will be form is 9.8 grams

The chemical reaction is as follows:

2KClO₃ → 2KCl + 3O₂

From the reaction 2 moles of potassium trichlorate decompose to form 2 moles of potassium chloride and 3 moles of oxygen.

Therefore,

molar mass of KClO₃ = 39 + 35.5 + 48 = 122.5 grams

molar mass of O₂ = 32 grams

Therefore,

2(122.5) g of  KClO₃ produces 3(32) grams of O₂

25 g of KClO₃ will produce ? grams of  O₂

cross multiply

mass of O₂  produced = 96 × 25 / 245

mass of O₂  produced = 2400 / 245

mass of O₂  produced = 9.7959

mass of O₂  produced ≈ 9.8 grams

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The process of evaporation by which liquid water changes to vapor is shown by a chemical formulae as follows:

Three separation methods that can be used to reverse a physical change include:

Evaporation is the process by which liquids changes to vapor or gas spontaneously.

The rate of evaporation of a liquid increases with increase in temperature of the liquid. The rate of evaporation also increases with increase in surface area of the liquid exposed as well as with increase in wind speed.

The process by which liquid water changes to vapor can be represented by chemical formulae as follows:

H₂O (l) → H₂O (g)

In the equation above, the liquid phase of water, l, is undergoing change to gaseous phase, g.

b. Separation techniques are techniques which are used to separate mixtures of substances.

Three separation methods that can be used to reverse a physical change include:

In conclusion, physical changes are those changes that are easily reversible and which no new products are formed.

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Answer: Thus X is Plutonium

Explanation:

Alpha Decay: In this process, a heavier nuclei decays into lighter nuclei by releasing alpha particle. The mass number is reduced by 4 units and atomic number is reduced by 2 units.

General representation of alpha decay :

\(_{Z}^{A}\textrm{X}\rightarrow _{Z-2}^{A-4}\textrm{Y}+_2^4\textrm{He}\)

where Z = atomic number

A= mass number

X and Y = atomic symbol of elements

\(_{Z}^{A}\textrm{X}\rightarrow _{92}^{235}\textrm{U}+_2^4\textrm{He}\)

Thus \(_{94}^{239}\textrm{Pu}\rightarrow _{92}^{235}\textrm{U}+_2^4\textrm{He}\)

Thus X is Plutonium with atomic number 94 and mass number 239

Answer:

the answer is D on edge

Explanation:

Answer:

it will float if the object is 1g/cm^3(water 's density ) because it is less dense

Answer:

CaCl2

Explanation:

Answer:

What are the answer choices?

Explanation:

I hope this helps, if it doesn't then just message me and ill be more than happy to help :)

Because the electrons are switching between one side of the cell and the other, to maintain charge balance.

The correct option is C.

The salt bridge is frequently an upside-down glass U-shaped tube filled with table salt in empirical settings. In order to create an electrochemical cell, its two legs dip into two different electrolyte vessels (the half-cells).

The salt bridge's job is to maintain the solutions' electrical neutrality while allowing unrestricted ion passage across cells. The absence of the salt bridge will result in a buildup of both positive and negative charges surrounding the electrodes, which will stop the reaction.

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The complete question is -

What is the main purpose of a salt bridge?

A-To maintain solution volume to allow higher concentration solution

B-To migrate to lower concentration solution.

C-To maintain charge balance because the electrons are moving from one-half cell to the other.

D-To allow exchange of metal cations only

The first two chemical equations are reversible while the other two are irreversible.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

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Answer: Significant figures in a measurement are all measured digits, and one estimated digit

Significant figures communicate the level of precision in measurements Significant figures are an indicator of the certainty in measurements.

Explanation:

Significant figures : The figures in a number which express the value or the magnitude of a quantity to a specific degree of accuracy or precision is known as significant digits.

The significant figures of a measured quantity are defined as all the digits known with certainty and the first uncertain or estimated digit.

Rules for significant figures:

1. Digits from 1 to 9 are always significant and have infinite number of significant figures.

2. All non-zero numbers are always significant.

3. All zero’s between integers are always significant.

4. All zero’s preceding the first integers are never significant.

5. All zero’s after the decimal point are always significant.

The true statements are

Significant figures in measurement are all measured digits, and one estimated digit

Significant figures communicate the level of precision in measurements Significant figures are an indicator of the certainty in measurements.

The following information should be considered:

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Experiments to evaluate activation energy are done by measuring the rate of reaction at different temperatures using the Arrhenius equation.

The activation energy for a chemical reaction can be calculated by measuring the rate of the reaction at different temperatures. In order to perform such experiments, a reactant must be chosen which undergoes the reaction with another reactant.

One of the reactants is then in excess, and so the concentration of that reactant can be assumed to remain constant throughout the reaction. The concentration of the other reactant must be measured at different times during the reaction. The rate of the reaction is then calculated by dividing the change in concentration by the time interval.

The rate of the reaction can then be plotted against the temperature, and the activation energy can be determined by using the Arrhenius equation. The Arrhenius equation is a mathematical formula that relates the rate of a reaction to the temperature and the activation energy.

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Solution :

Sir Isaac Newton was a great scientist. The discoveries of the Newton change the way we see the world. Newton gave us the fundamental principles through which the entire universe is governed.

Newtons 1st law of motion states that a body moves or stays in position until and unless an external force is applied to the body.

This is the law of nature.

An example which do not support this law can be a body having a huge mass and a small boy applies force to move it but is unable to move the body.

The force that holds the atoms within a molecule together is the chemical force. The chemical bond is an attraction force that keeps the atoms together in a molecule. There are three primary types of chemical bonds: covalent, ionic, and metallic.

Covalent bonds are the strongest type of chemical bond, and they involve the sharing of electrons between two or more atoms. The atoms that share electrons in a covalent bond are held together by the electrostatic force, which is the attraction between positive and negative charges.Ionic bonds involve the transfer of electrons from one atom to another. Positive and negative ions are held together by the electrostatic force in ionic bonds. Metallic bonds hold together metal atoms. The electrons of metal atoms move freely between atoms in a metallic bond, creating a bond between the atoms.Molecules are the result of chemical bonding, which is the force that holds atoms together. The number of atoms in a molecule is determined by the number of valence electrons in the atoms involved. In general, molecules are electrically neutral, meaning they have an equal number of positively and negatively charged particles.Therefore, chemical force is responsible for holding the atoms within a molecule together.

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The author's last name and the page number from which the quotation or paraphrase is extracted are used in MLA citations, for example : (Sam 163). Do not include a page number in the parenthetical citation if the source does not utilize page numbers: (Sam)

In the liberal arts and humanities, MLA (Modern Language Association) style is most frequently used to compose papers and cite sources. Brief parenthetical citations in the text that are keyed to an alphabetical list of the works cited at the end of the work are a feature of the MLA style.

In the humanities and liberal arts, the MLA style is often used. The manuscript text and parenthetical citations, often known as in-text citations, are formatted according to MLA standards. It also serves as the structure for the list of references and works cited section at the conclusion of the essay. MLA format prioritizes conciseness and clarity. It is advantageous for you to be familiar with both primary writing formats as a student writer, and this section will define the key components of MLA as well as provide particular instances of frequently used references.

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