A 98.3 g piece of copper (specific heat 0.380 J/g･°C) is heated and then placed into 400.0 g of water initially at 20.7°C. The water increases in temperature to 22.2°C. What is the initial temperature (in °C) of the copper? (The specific heat of water is 4.184 J/g･°C)

o.703..litter

Explanation:

M=n/v(l)solution

so v=n/M..... =8.48/12.05=0.703...

Answer:1.4652

Explanation:

0.74g/ml

0.74x1.98

=1.4652

The amount of force will be 320 N.

Force can be defined as the ratio of work and distance. The unit of the force will be Newton.  It can be represented by N. There are various type of force and they are tension force and frictional force.

The given data:

W = 8000J

d = 25m

The relation between the force, distance and work can be expressed as:

W = f×d....(i)

Put the given data in equation (i).

8000 J = f × 25m

f = 8000/25

f = 320 N

Therefore, the force will be 320 N.

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Answer:

Make Li-Ion batteries.

Produce commercial electric vehicles.

Create underwater subsea electrification.

Power telecommunication devices.

Explanation:

Minerals are essential raw materials in our daily lives, and are vital for economic, social and technological development. For example, in the following:

Agriculture: Phosphate rock, potash and lime are used in agricultural fertilisers and other mineral products are used to improve soil. The water you drink uses minerals to make it clean.

Construction: About 60 tonnes of aggregate are used to build an average house in the UK. If we include the associated infrastructure, this can be as high as 400 tonnes.

Minerals are used in building houses, schools, libraries, hospitals, offices and shops. Buildings use a wide range of minerals:

iron (as steel) in the framework of large building,

clay in bricks and roofing tiles,

slate for roofing tiles,

limestone, clay, shale and gypsum in cement,

gypsum in plaster,

silica sand in window glass,

sand and gravel and crushed rock as aggregates for fill and in concrete,

copper for plumbing and wiring,

clays for bathroom fixtures and fittings and tiles,

paint may include pigments, extenders and fillers from mineral sources.

Answer: toothpaste

Explanation:

The simplest form of calcium carbonate is CaCO3.

What is the use of Calcium carbonate?

Calcium carbonate can be used as a dietary supplement when the amount of calcium in a person's body is less. Calcium is used even as an antacid. Calcium is necessary by the body for bones, heart and muscles.

In this, we are not provided the direct masses, so we will use this percentage composition.

The number of moles of each element are:

Ca-40/40= 1

C- 20/12 = (1.6 considered to be 1)

O- 48/16 = 3

Now all the three will be divided with the lowest value and that is 1, so the ratio of Ca: C: O= 1:1:3

Therefore, the simplest formula is CaCO3.

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The pH of 20 mL of 0.27 M NH₃ (ammonia) solution after 0 mL of acid is 11.34.

The pH of 20 mL of 0.27 M NH₃ (ammonia) solution after 0 mL of acid has been added is equal to the pH of the solution when no acid has been added.

The pH of the NH₃ solution is calculated from the dissociation equation and the formula below:

Dissociation equation: NH₃ + H₂O ⇄ NH₄⁺ + OH⁻

Kb = [NH₄⁺] * [OH⁻] / [NH₃]

Kb of NH₃= 1.8 * 10⁻⁵

From the equation of dissociation above, [NH₄⁺] = [OH⁻]  = x

Kb = x²/ [NH₃]

x² = Kb * [NH₃]

x = √( Kb * [NH₃])

x = √(1.8 * 10⁻⁵ * 0.27)

x = 0.0022 M

[OH⁻] = 0.0022

pOH = - log [OH⁻]

pOH = -log (0.0022)

pOH = 2.66

pH = 14 - 2.66

pH = 11.34

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Explanation:

E =hv

= h*3*10power8meterpersecond ÷6.22*10power of -7m

where h is planks constant

Energy of light emitted is 4117.64 * 10 ⁻²⁵. E= hv.

An electron's energy is determined by where it is in relation to the atom's nucleus. The distance an electron in an atom has to travel from the nucleus depends on its energy level.

The mass of an electron is roughly 1/1836 that of a proton. The intrinsic angular momentum (spin) of the electron is given in units of the decreased Planck constant and has a half-integer value.

Energy has a negative sign, meaning that an electron is drawn to the nucleus. The electron has the least energy in the first orbit, and as n grows, or as it gets less negative, the electron's energy increases.

Therefore, Energy of light emitted is 4117.64 * 10 ⁻²⁵. E= hv.

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Triple beam balance is not used to measure the weight of water because it is used to  measure mass.

The triple beam balance is an instrument used to measure mass very precisely. Such devices typically have a reading error of ±0.05 grams. Its name refers to its three beams, where the middle beam is the largest, the far beam of medium size, and the front beam the smallest.

Spring balance is used to measure the weight of the body whereas beam balance is used to measure the mass of the body. Since the mass of the body remains the same on earth as well as on moon but the acceleration due to gravity differs.

Therefore Triple beam balance is not used to measure the weight of the water.

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15g of CO2 will be produced from 15g of O2  as 2 moles of O2 produces 2 moles of CO2

What is moles ?
In chemistry, a mole, sometimes spelled mol, is a common scientific measurement unit for significant amounts of very small objects like atoms, molecules, or other predetermined particles.

The mole designates 6.02214076 1023 units, which is a very large number. For the International System of Units (SI), the mole is defined as this number as of May 20, 2019, according the General Conference on Weights and Measures. The number of atoms discovered through experimentation to be present in 12 grams of carbon-12 was originally used to define the mole.

C2H4O2 + 2 O2 --> 2 CO2 + 2 H2O

2 unit of O2 produces 2 unit of CO2

15g of O2 produces 15g of CO2

15g of CO2 will be produced from 15g of O2  as 2 moles of O2 produces 2 moles of CO2

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Based on the mole ratio of the reaction, the mass of aluminum oxide that is produced from the reaction between 5 g of aluminum and 9g of oxygen is 9.39 g.

The mass of aluminum oxide that can be formed from the reaction between aluminum and oxygen is determined from the limiting reactant and the mole ratio of the reaction.

The mole ratio of the reaction is as given in the equation of the reaction below:

2 Al (s) + 3 O₂ (g) ----> Al₂O₃ (s)

The mole ratio of Al to O = 2 : 3

Moles of Al present = 5/27

Moles of Al present = 0.185 moles

Moles of O present = 9/32

Moles of Al present = 0.281 moles

Al is the limiting reactant

Mole ratio of Al to Al₂O₃ = 2 : 1

Mass of Al₂O₃ produced = 0.185/2 * 101.56

Mass of Al₂O₃ produced = 9.39 g

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The molar solubility of the barium salt is obtained as  1.29 * 10^-19 M.

We know that the solubility has to do with the amount of the solute that is able to dissolve in a solvent at a particular temperature. As such, it is clear that the solubility depends on the temperature of the solution.

We know that the Ksp can be gotten from the expression of the Ksp as follows;

Ksp = [3x]^3 [2x]^2

Ksp = 9x^3 * 4x^2

Ksp = 36 * x^5

Ksp = 36x^5

x =[tex]\sqrt[5]{\frac{KSP}{36} }[/tex]

x = [tex]\sqrt[5]{6.00x10^-37} /36[/tex]

x = 1.29 * 10^-19 M

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Different types of matter have different requirements because the pressure and temperature of a substance's environment dictate its phase.

Matter is anything that occupies space and has mass. The states or phases of matter include solids, liquids, gases, and plasma. Any material in a form that has a distinct shape and volume is referred to as a solid. Phase change refers to a shift in the condition of matter. Phase shifts can be carried out by people and occur frequently in nature.

A set of molecules will experience various movements, such as vibrations, rotations, and translations, depending on the average temperature in their vicinity.

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To solve such this we must know the concept of combustion reaction. Combustion reaction happens in presence of oxygen. Magnesium oxide is  formed when magnesium undergoes combustion.

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.

When magnesium undergoes combustion, the magnesium oxide is formed.

2Mg+O₂[tex]\rightarrow[/tex]2MgO

Therefore, magnesium oxide is  formed when magnesium undergoes combustion.

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The specific heat capacity of the metal can be calculated using the calorimeter equation. The specific heat capacity of the metal is obtained as 0.406 J/(°C g).

The specific heat capacity of a substance is the heat energy required to raise its temperature by one degree celsius per one gram of that substance.

The calorimeter equation relating heat energy q, mass m and temperature difference ΔT and specific heat capacity c is written as:

q = mcΔT.

In the given system the heat energy is transferred from the metal to water thus the final temperature of both will be 25 °C. Thus, at thermal equilibrium we can write it as:

25 g × c (95 -25 °C) = 25 × 4.18  × (25 - 18.2 °C )

Where, mass of water can be taken as 25 g since its density is 1 g/ml. From this specific heat capacity of the metal c is calculated as follows:

c =  [ 25 × 4.18  × (25 - 18.2 °C ) ] / 25 g ×  (95 -25 °C)

  = 0.406 J/(°C g).

Therefore, the specific heat capacity of the metal is  0.406 J/(°C g).

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Among the given compounds, H[tex]_2[/tex]S dissolves in water.

The dissolution of compounds in water depends on the polarity of that compound. As water is a polar solvent, polar compounds readily dissolve in water. As it is said that Like dissolves like, we can say that polar and ionic compounds dissolve in polar solvents while, non-polar compounds dissolve in non-polar solvents like benzene, hexane, and other organic solvents.

CBr[tex]_4[/tex], C[tex]_6[/tex]H[tex]_6[/tex], and CCl[tex]_4[/tex] are non-polar compounds and cannot dissolve in water due to the absence of d-orbital in carbon atoms so they cannot accept lone pairs of electrons from water. H[tex]_2[/tex]S  is also non-polar but the presence of a large sulfur atom gets easily polarized as compared to carbon and thus it dissolves in water.

Thus, due to the presence of a Sulfur atom, hydrogen sulfide dissolves in water.

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Answer: CH3-CO-CH3<CH3-CH2-OH<CH3-COOH

Explanation:

basically the boiling point depends upon the intermolecular hydrogen bonding. thus alcohol tends to have a higher boiling points then ketones because they have -OH group unlike carbonyl.

It is expedient that Asim put some few pancreatic blood in a test tube to test for the functioning of digestive enzymes produced by the pancreas.

When someone is considering the purpose of digestive enzyme experiments, it should be what is given below:

Objectives:

That being said, enzymes are organic, biological or biochemical catalysts which speed up the rate of chemical reactions. Within the context of the task given above, digestive enzymes help to speed up the digestion of food substances. In order to confirm why this substance stopped working, a pancreatic blood test needs to be done in a test tube to confirm the reasons why the substance stopped working.

However, some of the reasons why digestive enzymes stopped working include the following:

So therefore, screening for pH, concentration and temperature of the digestive enzyme can used to test for inactivity of enzymes.

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The pH of a solution prepared by adding 25.0 mL of 0.199 M ammonia to 25 mL of 0.199 M hydrochloric acid solution is less than 7.

The pH of a solution is calculated as follows;

pH = - log ([H⁺])

Also, pH = 14 - pOH

The pH of the solution is determined as follows;

Moles of HCl = 0.199 M * 25 mL * 1L/1000 mL

moles of acid = 0.004975 moles

Moles of NH₃ = 0.199 M * 25 mL * 1L/1000 mL

moles of NH₃ = 0.004975 moles

0.004975 moles of HCl reacts with 0.004975 moles of NH₃

Since NH₃ is a weak acid, the pH of the solution is slightly lower than 7.

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According to research, the ear is a complex organ that meets hearing, being of great importance to humans.

Hearing is a physiological process where sound waves, which are vibrations, enter through the outer ear and reach the middle ear, causing the eardrum to vibrate.

In this sense, the vibrations, in turn, cause the movement of small bones called stirrup, anvil and malleus, where they reach the organ of Corti, stimulating the auditory nerve and finally become nerve impulses that reach the brain.

Therefore, we can conclude that according to research, hearing is a process that implies that sound waves first impact the eardrum until finally reaching the auditory centers of our brain.

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Answer:

Na,Ba,Ti on the same base placement on the periodic table.

Answer:

O,S,Se

Explanation:

Because they lose electrons and become an anion to become ionicly bonded and they are in the same period

The intermolecular forces between the oxygen molecules are very weak because of which a very less amount of energy is required for the oxygen to evaporate into a gas. There is no H-bonding or dipole movement present in oxygen molecules because of which the forces binding the molecules are absent in oxygen.

hence your correct option should be D

The explanation of the reaction between the compounds is here.

What is compound?

A thing that is composed of two or more separate elements is called compound.

Sol-There is no chemical reaction. Know the extent between to react to react and fair play mixing I too means iodine and potassium I Od um ordered solution solution and I could not React directly as such bad form poorly I owed eight iron like I five and I seven. They negatively charged iodide in the negatively charged how you died. All right, come and did come about charge donor. The neutral iodine charging accepted a solution of iodine, a solution of iodine and potassium iodide um added in water had the light orange brown color, light orange brown color, orange brown color. Once a mileage is added it from another city complex. When once a mileage in my load I added it from another city complex.

When once a mileage in my load I added it from another city complezx.. The police have cried. The police had cried, the police have cried act as a George donor charges and the police have died. And the poly iodide act as a except her. The new council looks absorbing light of a different wavelength than polly iodide and the color turn dark dark blue. The object structure are poorly added inside the am I late helix Alex is not clear. Are bulky and sit inside the policy crowds of glucose units and could not get out of date.

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Answer:

0.3269

Explanation:

You would use the ideal gas law along with the equation Pv=nrt when P is pressure, v is volume, n is the moles of gas you are solving for, r is a constant that is , and t is temperature,

So you are given pressure, volume, and temperature, so you would begin by plugging in your known values:

P = 1atm

V = 8.00 L

T = 298 K ( but you usually want to use Kelvin so you would add 273.15; this is because 0 C is 273.15 K and 25+273=298)

(1)(8)=n(0.0821)(298)

then

8=n(24.4658)

next isolate n by dividing 24.4658 on each side

8/24.4658 = n (24.4658/24.4658)

0.3269=n(1) or n

Since energy can neither be created nor destroyed, it follows that the wavelength that was absorbed by the electron is also emitted.

We know that the Bohr model posses the idea that an electron could move from a lower to higher energy level by the absorption of a photon of light. Thus we know that, when we supply energy to the electron, it is that energy that leads to the electronic transition.

It is clear that the energy that the electron has taken in when it moves up is the same as the energy that it would give out when it comes down in accordance with the law of conservation of energy.

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Decantation is widely used to purify a liquid by separating it from an insoluble particle suspension (e.g. in red wine, where the wine is decanted from the potassium bitartrate crystals to avoid unsavory taste).

Decantation is a process of separating solid-liquid mixtures or two or more immiscible liquids. Allowing the mixture to settle into various layers, the lightest/heaviest liquid layers are drained out.

This approach is used in the following ways:

1. Mud-water mixture separation (solid-liquid mixture)

2. Oil and water separation (immiscible liquid mixture)

3. Kerosene and water separation

Decantation is the process of separating liquid from solid and other immiscible (non-mixing) liquids by eliminating the liquid layer on top from the solid or liquid layer underneath.

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The number of electrons represented by the following quantum numbers is 1 electron

The set of numbers used to describe the position and energy of the electron in an atom are called quantum numbers. There are four quantum numbers, namely, principal (n), azimuthal (l), magnetic(m) and spin quantum numbers (s). The values of the conserved quantities of a quantum system are given by quantum numbers.

According to the data given, n=2 which means the shell number is 2, l =-1 means its the subshell is p and only one orientation, which can accomodate maximum of 2 electrons, but as the ms = 1/2 so we are here talking about just one electron with a +1/2 spin

Therefore with the above given quantum number the electron represented is one

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