PLEASE HELP!!!!!
How much energy is needed to raise the temperature of 2.5 L of water from 20 C to 50 C? (anwer must be in Joules)

The answer is (e) 60, 160: there are 60 moles of copper ions and 160 moles of oxygen atoms in 20 moles of copper (II) phosphate.

The formula for copper(II) phosphate is Cu3(PO4)2.

To find the number of moles of copper ions in 20 moles of copper (II) phosphate, we must first find the number of moles of copper in one mole of copper (II) phosphate.

We have 3 moles of copper in one mole of copper (II) phosphate.

Therefore, we have:3 x 20 = 60 moles of copper ions

To find the number of moles of oxygen atoms in 20 moles of copper (II) phosphate, we first need to find the total number of oxygen atoms in 20 moles of copper (II) phosphate.

In one mole of copper (II) phosphate, there are 8 oxygen atoms (2 from each phosphate ion).

We have:8 x 20 = 160 oxygen atoms.

So, the answer is (e) 60, 160: there are 60 moles of copper ions and 160 moles of oxygen atoms in 20 moles of copper (II) phosphate.

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Answer:

thermal shock

Explanation:

the temperatures inside the glass jar should have continued to increase over time. Internal stresses due to uneven heating. This is also known as “thermal shock”.

In general, the thicker the glass, the more prone it will be to breaking due to the immediate differences in temperature across the thickness of glass.

Borosilicate glass is more tolerant of this, as it has a higher elasticity than standard silicon glass.

You may also note that laboratory test tubes and flasks are made with thinner walls, and of borosilicate glass, when designated for heating.

A solution is a homogenous mixture of two or more pure substances whose composition can vary within certain limits. A solution generally consists of two components, they are called solute and solvent.

A solution is called the supersaturated one which contains more dissolved solute than required for preparing the saturated solution and it is generally prepared by heating the saturated solution, adding more solute and then cooling it gently.

A supersaturated solution is unstable. Adding a small amount of the solute, a seed crystal will cause excess solute to rapidly precipitate or crystallize.

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The plane is mostly flying in the troposphere layer. This is because there is more turbulence.

Hope it helps you...

Hope it helps you...Answered by Benjemin ☺️

Answer:

Explanation:

no ask your teacher

Explanation:

there are two significant figures

Answer:

carbon electrode: delocalised electrons

molten mixture....: aluminium oxide ions

metal wire: Metal atoms

The free moving charged particles in the following substances are as follows;

Graphite, an allotrope of carbon has Delocalized (free-moving) electrons and these electrons serve to enable conductivity.

Although, cryolite is a bad conductor of electricity, when Molten Aluminium oxide and cryolite is used, the free moving Aluminium ions enable conductivity.

In metal wires, conductivity is solely the responsibility of metal ions.

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If 30 ml of a 0.80 m solution of k is mixed with 50 ml of a 0.45 m solution of clo−4, a precipitate will be observed in this solution.

The solution contains k (potassium) and clo−4 (chlorate) ions and we are to find out if a precipitate will form or not. The ksp for the following equilibrium is 0.004. kclo4(s)↽−−⇀k (aq) clo−4(aq)

We can obtain the molarity of k ions as follows: 0.80 M = (moles of K)/(0.030 L)Moles of K = 0.80 M × 0.030 L = 0.024 mol

We can obtain the molarity of clo−4 ions as follows: 0.45 M = (moles of clo−4)/(0.050 L)Moles of clo−4 = 0.45 M × 0.050 L = 0.0225 mol

The concentration of K and clo−4 ions are 0.8 M and 0.45 M respectively. Now, we need to calculate the reaction quotient Q of the solution to find out whether the precipitate will form or not. Q = [K+][clo−4] = 0.8 M × 0.45 M = 0.36

Since Q (0.36) > Ksp (0.004), the reaction quotient is greater than the solubility product constant. It indicates that the product is more than what it should be. The excess products will precipitate to form a solid. Hence, we can say that a precipitate will be observed in this solution.

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Answer:

1 mole = 6.02 × 10^23 molecules

5.13 moles = x

x = 5.13/1 × 6.02 × 10^23

= 3.088 × 10^24 molecules

A redox reaction's hydroxide ion component involving oxidation or reduction is referred to as a half reaction. By taking into account, we get a half reaction.

The diatomic anion OH, which is made up of oxygen and hydrogen atoms, is most frequently referred to in chemistry as hydroxide. It is among the known simplest diatomic ions. The group of substances that contain the hydroxide ion is referred to as "hydroxide" as well.

Galvanic cell with Zn and Cu as an example. CuSO4(aq) Zn(s) + CuSO4(aq) (s) Oxidation occurs at the Zn anode (the metal loses electrons). This can be seen in the oxidation half-reaction shown below (see how the electrons are on the products side): Zn(s) equals Zn2+ + 2e.

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Ethanol is produced when ethane and ethene react with water and a catalyst like sulfuric acid. Adding concentrated sulfuric acid to hot ethanol (acts as a catalyst).

To eliminate carbon dioxide and sulphur dioxide that are created as byproducts, the gases are passed through a sodium hydroxide solution. The main product that is gathered over water is ethene. As a result, dehydration of ethanol produces ethene rather than ethane. The names Mattling acid and Oil of Vitriol are other names for sulfuric acid. It is highly caustic and acidic in nature. It dehydrates and oxidises when  present in higher amounts. It is a clear, syrup-like liquid with no colour or smell. A substance having the chemical formula C 2H 6, ethane is an organic chemical.

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The byprοducts in this reactiοn are acetic acid (οptiοn A) and ethanοl (οptiοn C).

In acid catalysis and base catalysis, a chemical reactiοn is catalyzed by an acid οr a base. By Brønsted–Lοwry acid–base theοry, the acid is the prοtοn (hydrοgen iοn, H+) dοnοr and the base is the prοtοn acceptοr. Typical reactiοns catalyzed by prοtοn transfer are esterificatiοns and aldοl reactiοns.

The acid-catalysed hydrοlysis οf diethyl acetamidοbenzylmalοnate can lead tο variοus by prοducts depending οn the reactiοn cοnditiοns and specific chemical pathways. Hοwever, withοut mοre detailed infοrmatiοn οr a specific reactiοn mechanism, it is difficult tο prοvide a cοmprehensive list οf the by prοducts that may fοrm.

Based οn the infοrmatiοn prοvided, the acid-catalysed hydrοlysis οf diethyl acetamidοbenzylmalοnate delivers the desired (+)-phenylalanine hydrοchlοride prοduct and the fοllοwing byprοduct(s):

E. Bοth A and C: Acetic acid and ethanοl.

The hydrοlysis οf diethyl acetamidοbenzylmalοnate invοlves the cleavage οf ester bοnds, resulting in the fοrmatiοn οf acetic acid as a byprοduct. Additiοnally, since diethyl acetamidοbenzylmalοnate is an ester, hydrοlysis οf the ester bοnds can alsο prοduce ethanοl as anοther byprοduct.

Therefοre, the byprοducts in this reactiοn are acetic acid (οptiοn A) and ethanοl (οptiοn C).

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Complete Question :

Answer: During succession, new species move into an area and colonize it.

Explanation: Ecological succession refers to the process of change in the composition and structure of an ecosystem over time. It occurs due to the interactions between the biotic (living) and abiotic (non-living) components of an environment. As succession progresses, new species gradually establish and thrive in the area, leading to a change in the species composition. This process can occur over a long period of time, ranging from decades to centuries, depending on various factors such as environmental conditions and the specific type of succession.

Answer:

dic

Explanation:

Answer:

During a phase change, the addition of thermal energy will result in the temperature of a substance remaining constant as the electrostatic forces of the particles are overcome.

Phase changes occur when a substance changes from one state of matter to another, such as from a solid to a liquid or from a liquid to a gas. During a phase change, the thermal energy being added to the substance is used to overcome the electrostatic forces that hold the particles together, rather than being used to increase the kinetic energy of the particles. As a result, the temperature of the substance remains constant until the phase change is complete.

For example, when a solid is being melted into a liquid, the thermal energy being added is used to break the bonds between the particles in the solid. As a result, the temperature of the solid remains constant until all of the bonds have been broken and the substance has completely melted. Similarly, when a liquid is being vaporized into a gas, the thermal energy being added is used to overcome the attractive forces between the particles in the liquid, resulting in a constant temperature until the phase change is complete.

Explanation:

mark brainliest please

Answer: Silver

Explanation:

Answer:

SILVERRRRRRRRRRR

Explanation:

The following is true of pericyclic reactions: D. All of these statements are true of pericyclic reactions. The correct option is D.

Pericyclic reactions are a class of organic reactions that involve the simultaneous rearrangement of sigma bonds and pi bonds in a cyclic transition state. These reactions exhibit several characteristic features.

A. They are concerted reactions: Pericyclic reactions occur in a single step, without the formation of any intermediates. The reactants rearrange their bonds simultaneously to form the products.

B. They proceed via a cyclic transition state: During the reaction, the reactant molecules pass through a cyclic transition state where the rearrangement of bonds takes place. This cyclic transition state is often visualized as a ring-shaped structure.

C. No intermediates are formed: As pericyclic reactions are concerted, they do not involve the formation of any intermediates along the reaction pathway.

Therefore, all of these statements are true of pericyclic reactions. They are concerted, proceed via a cyclic transition state, and do not involve intermediates. These characteristics make pericyclic reactions distinct from stepwise reactions that involve the formation of intermediates. The correct option is D.

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Based on the data provided,  the rate of the given reactions are:

a. reaction rate =  0.0132 M/sec

b. rate of change of [H⁺] = 8.8 * 10⁻³ M/sec

Reaction rate = change in concentration of reactant or product/ time taken

Change in concentration of I⁻ = 1.000 M - 0.868 M= 0.132

time taken = 10 s

reaction rate = 0.132/10

Rate of reaction = 0.0132 M/sec

From the equation of the reaction 3 moles of I⁻ are used up for every 2 moles of H⁺

Hence, the rate of change of [H⁺] = 0.0132 M/sec * 2/3

rate of change of [H⁺] = 8.8 * 10⁻³ M/sec

Therefore, the rate of the given reactions are:

a. reaction rate =  0.0132 M/sec

b. rate of change of [H⁺] = 8.8 * 10⁻³ M/sec

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The best design for this experiment is to number the items from 1 to 1,200 and then choose random numbers in the table of random digits (second option).

These tables are used to randomly assign items or subjects into groups when experimenting. The best way to use these tables are:

Based on this, for this experiment the steps are:

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Answer:

b. Number each item from 1 to 1,200. Reading from left to right from a table of random digits, identify 800 unique numbers from 1 to 1,200. Assign the items with labels in the first 400 numbers to the process 1 group. Assign the items with labels in the second 400 numbers to the process 2 group. Assign the remaining items to the process 3 group.

Explanation:

Statistics A edg. 2023

Explanation

NH4Cl(s) = NH4+(aq) + Cl-(aq) AH = +3.5 kcal/mole

We have some changes that shift the equilibrium to the right, according to Le Châtelier's principle.

I will write some of them:

By Adding amount of NH4Cl or by increasing the temperature because according to the heat of the reaction this is an endothermic reaction.

Answer: Increasing the temperature of the system.

Answer:

A-battery

Explanation:

A battery has a positive and negative charge which can power a light bulb through the wires as long as the bulb is also connected to the other ends of the wires.

Ammonia is converted to nitrite, then to nitrate, and you'd like me to include the terms A) Nitrification, B) Denitrification, C) Assimilation, D) Ammonification, and E) Nitrogen fixation in my answer.

The process where ammonia is converted to nitrite and then to nitrate is known as

A) Nitrification. During nitrification, ammonia-oxidizing bacteria convert ammonia to nitrite (NO2-), and nitrite-oxidizing bacteria further convert nitrite to nitrate (NO3-).

B) Denitrification is the process where nitrate is reduced to nitrogen gas (N2) by denitrifying bacteria, releasing it back into the atmosphere.

C) Assimilation is the process where plants take up nitrogen in the form of nitrate or ammonium ions from the soil and incorporate it into their tissues.

D) Ammonification is the process where organic nitrogen compounds (such as proteins and nucleic acids) in dead organisms and waste products are converted to ammonia (NH3) or ammonium ions (NH4+) by decomposer microorganisms.

E) Nitrogen fixation is the process where nitrogen gas (N2) from the atmosphere is converted into ammonia (NH3) or other biologically available forms of nitrogen, primarily by nitrogen-fixing bacteria and archaea.

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Alkenes are hydrocarbons that contain a double carbon bond, whereas alkanes are hydrocarbons that only have single carbon-carbon bonds.

The reason why alkenes are more reactive than alkanes is that the double bond has a very high electron density in comprarison to the single bond of the alkanes. This double bond is made up of one very strong σ bond and a weak π bond.

So generally alkenes react breaking the π bond.

Answer:

3132 is the answer

Explanation:

3BaCl2 + Al2S3 → 3BaS + 2AlCl3

Answer:

Explanation:

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The formula of barium phosphite is Ba₃(PO₄)₂.

A salt that is classified as inorganic is barium phosphate. The chemical formula for barium phosphate is Ba₃(PO₄)₂. Although barium phosphate is typically thought of as a colorless solid, it does have a fading odor resembling that of acetic vinegar. The barium phosphate structure was identified by the X-ray crystallography experiment as a connection of barium ions with the phosphate, Ba₂⁺ cations connected to a polyphosphate anion. The salts or esters that are created when tetrahedral PO₄ is transformed into a polyphosphate anion (phosphate). The oxygen atom that the structural unit shares is what binds it together. One of the hydrated forms of barium phosphate is barium phosphate dihydrate.

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Answer:

Bronze is made of the metals copper and tin.

Explanation:

Bronze is stronger than copper as an outcome of combining that metal with tin or different ores. Bronze is more quickly dissolved and is hence more comfortable to cast. It is also harder than pure metal and considerably extra immune to corrosion.

Pure copper is soft and can be formed into wire or pounded into wanted shapes. If the copper is consequently warmed (tempered), it can be performed soft again. Copper and zinc are blended to create brass, and mixed with tin to produce bronze.

Answer:

-27.2 kJ

Explanation:

We can use the heat-transfer formula. Recall that:

\(\displaystyle q = mC\Delta T\)

Where m is the mass, C is the substance's specific heat, and ΔT is the change in temperature.

Hence substitute:

\(\displaystyle \begin{aligned} q & = (100.0\text{ g})\left(\frac{4.18\text{ J}}{\text{g-$^\circ$C}}\right)(20.0\text{ $^\circ$C} - 85.0\text{ $^\circ$C}) \\ \\ & =(100.0\text{ g})\left(\frac{4.18\text{ J}}{\text{g-$^\circ$C}}\right)(-65.0\text{ $^\circ$C}) \\ \\ & = -2.72\times 10^4\text{ J} = -27.2\text{ kJ}\end{aligned}\)

Therefore, the cooling of the water released about 27.2 kJ of heat.

According to the position of an object in free fall in the air, we answer the questions according to the expression mentioned above.

A) The expression for the velocity of the object can be found by taking the derivative of the position expression with respect to time. This gives:

\(\[ V=\frac{dX}{dT}=V_{0}\left(1-E^{-T / T_{0}}\Right) \]\)

The term \(\( V_{0} \)\) is called the terminal velocity because it represents the maximum velocity that the object can reach as it falls. As time goes on, the velocity approaches this value, but never exceeds it.

B) The expression for the acceleration of the object can be found by taking the derivative of the velocity expression with respect to time. This gives:

\(\[ A=\frac{dV}{dT}=V_{0}\left(\frac{E^{-T / T_{0}}}{T_{0}}\Right) \]\)

C) The expression for the acceleration of the object as a function of its velocity can be found by rearranging the velocity expression and then substituting it into the acceleration expression. This gives:
\(\[ T=-T_{0}\ln\left(1-\frac{V}{V_{0}}\right) \]\)

\(\[ A=V_{0}\left(\frac{E^{-T / T_{0}}}{T_{0}}\Right)=V_{0}\left(\frac{1-\frac{V}{V_{0}}}{T_{0}}\Right)=\frac{V_{0}-V}{T_{0}} \]\)

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Answer:

a collection device in the area that counts the number of mosquitoes caught weekly

Explanation: just bcuz

Deforestation is an example of a human activity that can alter chemical cycles, specifically the carbon cycle. Deforestation refers to the permanent removal or clearing of forests or wooded areas, typically for human activities such as agriculture, logging, urban expansion, or the establishment of infrastructure.

When forests are cleared or destroyed through deforestation, the vegetation and organic matter in the forests are often burned or decomposed. This process releases a significant amount of carbon dioxide (CO2) into the atmosphere. Trees play a crucial role in the carbon cycle as they absorb CO2 through photosynthesis and store carbon in their biomass and soil. By removing forests, the natural carbon sink is diminished, and the balance of carbon dioxide in the atmosphere is disrupted.

Additionally, deforestation can lead to increased soil erosion. Without the tree roots and vegetation to hold the soil in place, erosion can occur more easily. This can result in the loss of valuable nutrients from the soil, such as nitrogen and phosphorus, which are essential for plant growth. The altered chemical composition of the soil affects nutrient cycling and availability for both plants and other organisms.

Overall, deforestation disrupts the natural balance of the carbon cycle and nutrient cycles, contributing to increased greenhouse gas emissions and nutrient depletion in ecosystems. It highlights how human activities can have significant impacts on chemical cycles and the functioning of ecosystems.

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Answer:

B. It is a zero-order reaction with respect to both reactants

Explanation:

In the reaction A + B C, doubling the concentration of A doubles the reaction rate, and doubling the concentration of B doubles the reaction rate. Which statement best describes this reaction?