A solution has [H+] = 4.7 Ã10-3 M. The[OH-] in this solution is4.7x10^114.7x10^-172.1x10^-121x10^-14none of these

Answer: A copper cylinder has a mass of 76.8 g and a specific heat of 0.092 cal/g·C. It ... J ql = mwcwΔTw. ΔTw = ql/(m x c). ΔTw = 7.96 x 10. 4. J/(625 g x 4.18 J/g·K) = 30.5 ...

Explanation:

As stated in the preceding statement Square pyramidal geometry describes the molecules.

An atom is made up of a core nucleus and one or maybe more electrons with negative charge that orbit it. The positively charged, comparatively hefty protons and neutrons that make up the nucleus may be present.

The quantity of protons an atom has makes it distinct from other atoms. Consequently, a particle devoid of protons isn't just an atom. But even a single proton constitutes every atom (of hydrogen). Individual particles of something like the periodic table elements like sodium, plutonium, argon, among chlorine are examples of atoms.

To know more about atom visit:

https://brainly.com/question/1566330

#SPJ4

The given chemical equation can be balanced as: CH4 + 2O2 → CO2 + 2H2OTherefore, the balanced chemical equation for the reaction between 46 g of CH4 and 32 g of O2 is:CH4 + 2O2 → CO2 + 2H2OMoles of CH4 = (46 g)/(16.04 g/mol) = 2.87 molMoles of O2 = (32 g)/(32 g/mol) = 1 mol.

Moles of CH4 = (46 g)/(16.04 g/mol) = 2.87 molMoles of O2 = (32 g)/(32 g/mol) = 1 molFor the given reaction, one mole of CH4 reacts with 2 moles of O2. Therefore, 2.87 moles of CH4 would react with 2 × 2.87 = 5.74 moles of O2. As we can see from the given values, only 1 mole of O2 is present. Hence, O2 is the limiting reactant.The balanced chemical equation for the reaction between 46 g of CH4 and 32 g of O2 is:CH4 + 2O2 → CO2 + 2H2OOn

The basis of the balanced chemical equation, 2 moles of O2 is required for one mole of CH4. Here, the moles of O2 is lesser than 2 times the moles of CH4, which means O2 is the limiting reactant and CH4 is the excess reactant. Hence, 32 g of O2 will react completely with 1 mole of CH4, and 14.14 g of CO2 and 4 g of H2O will be produced as per the stoichiometry.

To know more about chemical equation visit:

https://brainly.com/question/28792948

#SPJ11

The enthalpy of solution per mole of \($\mathrm{NaCl}$\) is \($+3 \mathrm{~kJ}$\).

Lattice energy (NaCl solid) = -786 kJ/mol

Hydration enthalpy (sodium and chloride ions) = -783 kJ/mol

The Born-Haber cycle for NaCl dissolution can be given as follows:

Where,

\(- $\Delta_{\text {soln }} \mathrm{H}$\) - solution enthalpy-energy changes when\($1 \mathrm{~mol}$\)solid salt is converted to corresponding aqueous ions.

\(- $\mathrm{U}_1$\)- lattice energy- energy released during solid lattice formation (negative of lattice energy is taken because here, the lattice is ruptured).

\(- $\Delta_{\text {hyd }} \mathrm{H}$\) - hydration enthalpy- energy changes when gaseous ions of a solid salt are hydrated.

The formation of aqueous sodium and chloride ions from \($\mathrm{NaCl}(\mathrm{s})$\)involves the rupture of lattice and hydration. Therefore,

\($$\Delta_{\text {soln }} \mathrm{H}(\mathrm{NaCl})=-\mathrm{U}_1(\mathrm{NaCl})+\Delta_{\mathrm{hyd}} \mathrm{H}\left(\mathrm{Na}^{+}\right)+\Delta_{\mathrm{hyd}} \mathrm{H}\left(\mathrm{Cl}^{-}\right)$$\)

The hydration energy of sodium and chloride ions together is given as \($-783 \mathrm{~kJ} / \mathrm{mol}$\), and the\($\mathrm{NaCl}$\) lattice energy is \($-786 \mathrm{~kJ} / \mathrm{mol}$\).

Therefore,

\(\Delta_{\text {soln }} \mathrm{H} & =-(-786 \mathrm{~kJ} / \mathrm{mol})+(-783 \mathrm{~kJ} / \mathrm{mol}) \\& =+3 \mathrm{~kJ} / \mathrm{mol}\)

Hence, the enthalpy of solution per mole of \($\mathrm{NaCl}$\) is \($+3 \mathrm{~kJ}$\).

The complete question is,

The lattice energy of\($\mathrm{NaCl}$ is $-786 \mathrm{~kJ} / \mathrm{mol}$\), and the enthalpy of hydration of 1 mole of gaseous \($\mathrm{Na}^{+}$\)and 1 mole of gaseous \($\mathrm{Cl}^{-}$\)ions is\($-783 \mathrm{~kJ} / \mathrm{mol}$\). Calculate the enthalpy of solution per mole of solid \($\mathrm{NaCl}$\).

To learn more about Enthalpy of Solution refer to:

https://brainly.com/question/26954829

#SPJ1

The triple bond between C1 and C2 is formed by the hybrid orbitals spsp s p s p.

What is the molecular shape VSEPR theory, often known as the valence-shell electron-pair repulsion theory?

The fundamental idea in molecular structures is known as valence shell electron pair repulsion (VSEPR). It basically says that electron pairs are attracted to one another and want to keep as far away as possible because they are made up of negatively charged particles.

What are the three fundamental assumptions of the VSEPR theory?

Since electron pairs are negatively charged, they will go as far apart as they can. Instead of bound electron pairs, lone pairs use up space. In comparison to single bonds, double bonds

To know more about vsper theory visit:

https://brainly.com/question/14992767

#SPJ4

Answer: Energy has the ability to cause motion and create change.

All of the following are qualitative tests that are often used to identify unknown ionic compounds except titration.

Qualitative tests are conducted to determine the presence or absence of certain ions or compounds in a sample based on their characteristic reactions. Common qualitative tests include flame tests, precipitation reactions, color changes, and gas evolution tests.

Titration, on the other hand, is a quantitative technique used to determine the concentration of a specific substance in a solution by reacting it with a standardized solution of another substance. It is not typically used as a qualitative test for identifying unknown ionic compounds.

learn more about ionic compounds here

https://brainly.com/question/30420333

#SPJ11

The main reservoirs of the carbon cycle are the atmosphere, oceans, land (including vegetation and soils), and fossil fuels. In these reservoirs, carbon exists in both inorganic and organic forms.

The inorganic carbon cycle involves the exchange of carbon dioxide (CO2) between the atmosphere and oceans through processes like photosynthesis and respiration.

Organic carbon, on the other hand, is found in living organisms, dead organic matter, and soil organic matter. It is cycled through processes such as decomposition and consumption by organisms. The interactions between the inorganic and organic carbon cycles occur primarily in the biosphere, where photosynthesis converts inorganic carbon into organic carbon compounds. While inorganic carbon is primarily in the form of CO2, organic carbon is present in complex organic molecules. Both forms of carbon play crucial roles in energy transfer, nutrient cycling, and climate regulation.

Learn more about Carbon Cycle

brainly.com/question/13729951

#SPJ11

    ZINC

To identify the element based on the informartion given, we have to find the molar mass since this mass is unique to each element.

            Molar mass = mass ÷ moles

We already know the mass based on the question, as such we now need to find the # of moles.

           Since 1 mole contains 6.02214 × 10²³ atoms

      then let  x moles contain 4.19 × 10²³ atoms (given in the question)

      ⇒   x =  (4.19 × 10²³ atoms  ×  1 mol) ÷ 6.02214 × 10²³ atoms

              x  =  0.69577 mol

Now that we have the moles we can substitute it into the molar mass equation and solve for the molar mass.

           ⇒ molar mass = 45.6 g ÷ 0.69577 mol

           ⇒ molar mass ≈  65.54 g/mol

                    This molar mass is closest to that of ZINC.

Neil Bohr used the fluorescent screen and an alpha particle detector to study the structure of an atom.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

The atom as a whole is neutral and stable due to presence of oppositely charged particles.

Learn more about atom,here:

https://brainly.com/question/13654549

#SPJ1

Answer:

septembar 9 2003

Explanation:

he died in september 9 2003

Answer:

Your answer:

His cause of death was a stroke ( heart attack)

hope this helped you

please mark as the brainliest (ㆁωㆁ)

Answer:

Excess fertilizer alters the soil by creating too high of a salt concentration, and this can hurt beneficial soil microorganisms. Over- fertilization can lead to sudden plant growth with an insufficient root system to supply adequate water and nutrients to the plant

Explanation:

Answer:

4.70 grams of NH4Cl is needed to prepare 350 mL of a 0.25 M ammonium chloride solution.

We need approximately 4.68 grams of NH4Cl to prepare a 0.25 M ammonium chloride solution with a volume of 350 mL.

To determine the mass of NH4Cl needed to prepare the solution, we us use the formula:

m=M x V x MM ... (i)

where,

m= mass in grams

M=molarity of solution

MM= molar mass of compound

V= volume in litres

The number of moles of NH4Cl needed can be calculated using:

  Moles = Molarity x Volume ...(ii)

  Moles = 0.25 mol/L x 0.350 L

  Moles = 0.0875 mol

Hence we can replace M x V with number of moles in equation i.

The molar mass of NH4Cl is :

  Molar mass of NH4Cl = (1 x 14.01 g/mol) + (4 x 1.01 g/mol) + (1 x 35.45 g/mol)

  Molar mass of NH4Cl = 53.49 g/mol

We have all the variables

Putting them in equation i.

Hence,

  Mass (g) = Moles x Molar mass

  Mass (g) = 0.0875 mol x 53.49 g/mol

  Mass (g) = 4.68 g

Therefore, you would need approximately 4.68 grams of NH4Cl to prepare a 0.25 M ammonium chloride solution with a volume of 350 mL.

To learn more about Stoichiometry,

https://brainly.com/question/16060223

Among the given mediums, Vaccuum is the best thermal insulator to reduce the transfer of thermal energy by radiation as there will be no air particles which carries heat from one place to other. Hence, Option (D) will be the correct option

Heat Radiation refers to the transfer of heat from a hot body to cold body directly, without heating the medium between two bodies.

Vaccum does not have any particles in it. Thus, there will be no transfer of heat through it.

The best example of it is thermous flask in which vaccuum inside thermous flask reduces the transfer of energy through it.

Hence,Among the given mediums, Vaccuum is the best thermal insulator to reduce the transfer of thermal energy by radiation as there will be no air particles which carries heat from one place to other. Thus, Option (D) will be the correct option

Learn more about radiation here ;

https://brainly.com/question/5715844

#SPJ1

Answer:

3 : 20 = 6 : 40

Explanation:

3 is multiplied by 2 so the 20 is also multiplied by 2 giving you the answer above.

The value of costant K at 234 K is 0.13.

What is the costant (K)?

To solve this problem, we can use the van 't Hoff equation:

ln(K2/K1) = -(ΔH°/R) * (1/T2 - 1/T1)

where K1 is the equilibrium constant at temperature T1, K2 is the equilibrium constant at temperature T2, ΔH° is the standard enthalpy change for the reaction, R is the gas constant, and T is the temperature in Kelvin.

We can rearrange this equation to solve for K2:

K2 = K1 * \(e^{(-(ΔH°/R)}\) * (1/T2 - 1/T1))

Plugging in the given values, we get:

K1 = 10.5

T1 = 350 K

T2 = 234 K

ΔH° = -18.8 kJ/mol (be careful with the units!)

R = 8.314 J/(mol*K)

K2 = 10.5 * \(e^{(-(-18.810^3 J/mol)/(8.314 J/(molK)) * (1/234 K - 1/350 K))}\)

K2 = 0.13

Therefore, the value of K at 234 K is 0.13.

What is equilibrium constant?

Equilibrium constant (K) is a thermodynamic constant that describes the ratio of the concentrations or pressures of reactants and products in a chemical reaction that has reached equilibrium at a given temperature and pressure. The value of K provides important information about the position of equilibrium and the relative amounts of reactants and products at equilibrium. If K is greater than 1, the reaction favors the products at equilibrium, whereas if K is less than 1, the reaction favors the reactants at equilibrium. If K is equal to 1, the reaction is at equilibrium and the concentrations or pressures of the reactants and products are equal.

To know more about equilibrium constant, visit:

https://brainly.com/question/14932239

#SPJ9

Answer:

Explanation:

Hope It Helps!!!!

Answer:

See belwo

Explanation:

First it becomes a compressed gas.... further pressure will cause it to condense into a liquid.

The objects or machine that I use every day is backpack. The correct option is a. The two properties that can be observed by senses are boiling point and color. Two properties that require test are volume and temperature.

The properties are divided into physical and chemical properties. The material properties are shape, size, color, density, hardness, malleability, melting and boiling point, etc.

Thus, the objects or machine that I use every day is backpack. The correct option is a. The two properties that can be observed by senses are boiling point and color. Two properties that require test are volume and temperature.

Learn more about properties of a material

https://brainly.com/question/13495300

#SPJ1

The equilibrium constant for the system at the given temperature is 1.1×10⁻⁵

Equilibrium constant for a given is defined as the concentration of the products raised to their coefficient to the concentration of the reactants raised to their coefficient

For example:

eB <=> cD

The equilibrium constant for the reaction above is given as

Ke = [D]^c / [B]^e

The equilibrium constant for the reaction reaction can be obtained as follow

Ke = [NO]² / [N₂][O₂]

Ke = [1.1×10⁻⁵]² / [6.4×10⁻³][1.7×10⁻³]

Ke = 1.1×10⁻⁵

Thus, the equilibrium constant for the reaction at the given temperature is 1.1×10⁻⁵

Learn more about equilibrium constant:

https://brainly.com/question/17960050

#SPJ1

Complete question

See attached photo

This cycle, in which water vapour within a sealed pot condenses back to liquid, is reversible. Reversible processes are ones that can be undone with no alteration to the environment or the system.

In this situation, chilling the system—the opposite of heating the water to evaporate it—can be used to condense the water vapour back into liquid.

The pot's tight seal is the essential component that allows this cycle to be reversed. Because there is no way for water vapour to leave the system, it may continually cycle through the phases of vaporisation and condensation without losing any substance.

As long as the system is sealed and the criteria are met, the cycle between the liquid and vapour stages can be repeated.

To know more about condensation:

https://brainly.com/question/1447093

#SPJ4

The ideal gas model is not accurate for calculating the specific volume of saturated water vapor when compared to steam table data at 10 kPa and 1 MPa.

The ideal gas model assumes that gases behave ideally and follows the ideal gas law, which states that the specific volume of a gas is inversely proportional to its pressure. However, this model does not consider the complex behavior of water vapor, particularly near the saturation point. In contrast, steam tables provide comprehensive and accurate data based on empirical observations and experiments.

When comparing the specific volume values obtained from the ideal gas model and steam table data for saturated water vapor at 10 kPa and 1 MPa, significant discrepancies can be observed. The steam table values are obtained through extensive measurements and calculations, taking into account the real behavior of water vapor, including the effects of pressure, temperature, and phase change. On the other hand, the ideal gas model oversimplifies the behavior of water vapor by assuming it follows the ideal gas law, leading to inaccurate results.

In conclusion, when calculating the specific volume of saturated water vapor, it is advisable to rely on steam table data rather than the ideal gas model. The steam table provides more accurate and reliable information by considering the complex behavior of water vapor, while the ideal gas model fails to capture the nuances of its phase change and non-ideal characteristics.

To learn more about ideal gas click here, brainly.com/question/30236490

#SPJ11

The two-step synthesis of cyclopentane-carboxylic acid from cyclopentanone involves the conversion of cyclopentanone into cyclopentyl sulfate using sulfuric acid as the reagent in the first step. In the second step, the leaving group is substituted by a carboxyl group using sodium or potassium cyanide as the reagent.

To synthesize cyclopentane carboxylic acid from cyclopentanone, a two-step process is typically employed. In the first step, the hydroxyl group of cyclopentanone is converted into a leaving group, which is then substituted by a carboxyl group in the second step. Here are the missing reagents and the intermediate formed for each step:

Step 1: Conversion of Cyclopentanol into a Leaving Group Intermediate
To convert cyclopentanone into a suitable leaving group, an acid is commonly used. The acid protonates the hydroxyl group, making it a better-leaving group. In this case, sulfuric acid (H2SO4) can be used as the reagent. The resulting intermediate formed is cyclopentyl sulfate.

Step 2: Substitution of the Leaving Group with a Carboxyl Group
In the second step, the leaving group (cyclopentyl sulfate) is replaced by a carboxyl group (-COOH). To achieve this, a nucleophile that can attack the sulfur atom in the intermediate is required. Sodium or potassium cyanide (NaCN or KCN) can be used as the reagent. This leads to the formation of cyclopentane-carboxylic acid, with the sulfate group replaced by the carboxyl group.

Learn more about potassium cyanide here:-

https://brainly.com/question/31383559

#SPJ11

The amount of 95% ethyl alcohol required depends on the data.

To determine the amount of 95% ethyl alcohol needed to dissolve 0.3 g of sulfanilamide at 78°C, it is necessary to refer to the data from Technique 11, Figure 11.2.

This graph provides information about the solubility of sulfanilamide in relation to the concentration of the solvent, which is 95% ethyl alcohol. By analyzing the graph, the concentration of sulfanilamide at 78°C can be determined.

Then, based on the desired solute concentration, the corresponding concentration of the solvent can be identified. This concentration can be used to calculate the amount of 95% ethyl alcohol required to dissolve the given mass of sulfanilamide.

By utilizing the data from the graph, the appropriate quantity of solvent can be determined to ensure successful dissolution of the sulfanilamide.

Learn more about alcohol

brainly.com/question/29268872

#SPJ11

Ketoses such as fructose are expected to give a positive Tollens test because of their ability to reduce Tollens' reagent.

The Tollens test is a chemical reaction used to test for the presence of aldehydes. The test is named after the German chemist Bernhard Tollens. The Tollens reagent is a solution of ammoniacal silver nitrate, Ag(NH3)2NO3. The test is based on the fact that aldehydes are readily oxidized to carboxylic acids by a solution of silver nitrate in ammonia.

This reaction is exothermic and produces a silver mirror on the inside of the test tube.The test solution is prepared by adding a few drops of a solution of Tollens' reagent to the substance being tested. The test solution is then heated in a water bath for a few minutes.

If the substance being tested is an aldehyde, it will reduce the silver ions in the Tollens' reagent to metallic silver. The metallic silver will form a mirror on the inside of the test tube. If the substance being tested is not an aldehyde, no mirror will form.The aldehydes are more easily oxidized than the ketoses.

Learn more about Tollens test -

brainly.com/question/31520675

#SPJ11

The process in the petroleum industry involves bringing oil and gas to the surface, converting crude oil into other products, and selling those products to customers. The correct choice is B. upstream; downstream.

In the petroleum industry, the process can be divided into three main sectors: upstream, midstream, and downstream. Upstream activities involve the exploration and extraction of crude oil and natural gas from underground reserves. This includes locating oil and gas deposits, drilling wells, and bringing the oil and gas to the surface.

Once the oil and gas are extracted, the midstream sector comes into play. Midstream activities involve the transportation, storage, and processing of the crude oil and natural gas. This includes pipelines, storage tanks, and facilities that separate the oil and gas into different components.

Finally, the downstream sector involves refining the crude oil into various products and selling those products to end consumers. Downstream activities include refining, petrochemical production, distribution, and marketing of the final petroleum products, such as gasoline, diesel, jet fuel, lubricants, and various other chemicals.

Therefore, in the given scenario, the correct choice is B. upstream; downstream, as it represents the process of bringing oil and gas to the surface (upstream) and then converting crude oil into other products and selling them to customers (downstream).

Learn more about crude oil here:

https://brainly.com/question/352552

#SPJ11

The coefficients in a balanced equation can be used as molar ratios, which can act as conversion factors to relate the reactants to the products. These conversion factors state the ratio of reactants that react but do not tell exactly how much of each substance is actually involved in the reaction.

Answer:

Answer

Change in temperature

It is an example of an endothermic reaction. It is absorbing heat.

Explanation:

We have a 63.9 g sample of calcium hydroxide. First we have to convert those grams into moles. To do that we have to use the molar mass of calcium hydroxide.

Calcium hydroxide = Ca(OH)₂

molar mass of Ca = 40.08 g/mol

molar mass of O = 16.00 g/mol

molar mass of H = 1.01 g/mol

molar mass of Ca(OH)₂ = 1 * 40.08 g/mol + 2 * 16.00 g/mol + 2 * 1.01 g/mol

molar mass of Ca(OH)₂ = 74.10 g/mol

mass of Ca(OH)₂ = 63.9 g

moles of Ca(OH)₂ = 63.9 g /(74.10 g/mol)

moles of Ca(OH)₂ = 0.862 moles

In 1 molecule of Ca we have 2 atoms of O. So in 1 mol of Ca(OH)₂ we will have 2 moles of O atoms.

1 mol of Ca(OH)₂ = 2 moles of O atoms

moles of O atoms = 0.862 moles of Ca(OH)₂ * 2 moles of O /1 mol of Ca(OH)₂

moles of O atoms = 1.724 moles

One mol is similar to a dozen. When we say that we need a dozen eggs we know that we need 12 eggs. If we want a mol of eggs, we want 6.022*10^23 eggs. So one mol of something is 6.022 * 10^23 of that.

1 mol of O atoms = 6.022 * 10^23 atoms

n° of O atoms = 1.724 moles * 6.022 * 10^23 atoms/1 mol

n° of O atoms = 1.04 * 10^24 atoms

Answer: In a 63.9 g sample of Ca(OH)₂ we have 1.04 *10^24 atoms of oxygen.