A 200g piece of iron absorbs 8980 joules to raise the temperature from 20°C to 120°C. Find the specific heat of iron?

Answer: Winter

Explanation:

When winter comes along everything freezes- rivers,lakes there is snow on the mountain top. That is a physical change; because the chemical makeup the water in those lakes in rivers is still the same.  

0.0026 mol  of calcium chloride are needed to produce 0.78 moles of calcium nitrate.

Molar mass is described as the mass in grams of 1 mole of a substance. The devices of molar mass are grams in line with mole, abbreviated as g/mol.

The mass of an isotope of any given element The quantity of moles of a substance equals the ratio of its given mass in a chemical response to the mass of 1 mole of that substance. One mole of any substance equals Avogadro's quantity, that is, 6.023 × 1023. It is likewise used to explicit attention devices which include mole in line with litre or molecular weight.

1 mol CaCl2 produces 2 mol CaCl2

Molar mass CaCl2 110.98 + 35.45 = 146.43 g/mol

Mol Ca(NO3)2in 0.78 g = 0.78 g / 146.43 g/mol = 0.0053 mol

This will require 0.0053/2 = 0.0026 mol

Answer to your question: 0.0026 mol

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The molecular formula of the given sample is obtained by the ideal gas equation that is PV=nRT.

here volume given is 3.9L and pressure give n is 2 atm and temperature given is 25 C, amount of the sample given is 25 g. here we put the expression of ,  PV= nRT .then it is found to be 7.7% hydrogen and 92.3% carbon. first we should convert the percentage in to mass. so,7.7% becomes 7.7g and 92.3% become 92.3 gram. Then transform the mass into moles. so H becomes 7.7/1.01= 7.62 mole. and C becomes, 92.3/12.01= 7.69 moles. Then put all these in the relation of empirical formula and molecular formula. Then the molecular formula of the unknown gas can be obtained.

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Considering the definition of chemical reaction, the process in which atoms rearrange to form new substances is chemical reaction.

A chemical reaction is the way in which one substance reacts with another. So, chemical reactions are thermodynamic processes of transformation of matter in which reactants or reactants intervene, which change significantly in the process, and can consume or release energy to generate two or more substances called products.

In a chemical reaction, chemical bonds between atoms are broken and new bonds are formed. In other words, for a specific product to be formed from a reactant, it is necessary to break bonds that hold them together and reorganize structures, forming new bonds and forming other substances.

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The most logical conclusion is A new crust is being formed in the middle of the Atlantic ocean.

Atlantic ocean crust is the oldest ocean crust in the middle of the Atlantic Ridge .The formation of crust in the Mid - ridge increases the Atlantic ocean

Thus, if a ship takes a set of rock samples from the floor of the Atlantic ocean. The sample show that rocks in the crust near the middle of the ocean are young , while rocks near the east and west sides of the ocean are older. A new crust is being formed in the middle of the Atlantic ocean.

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Answer:

Water is polar and can form intermolecular hydrogen bonds due to high electronegativity of oxygen atom. Methane is non-polar and can only form weak dispersion forces between its molecules carbon has a lower electronegativity.

Explanation:

Answer

A - Overharvesting

Explanation

Overharvesting can lead to habitat loss because when we harvesting a renewable resource at a rate that is unsustainable, it can lead to loss of resources.

Answer:

Explanation:

Here, we want to give a reason for why one of the reactions might not occur

Generally, a metal that is above another in the electrochemical series will displace it from its salt

Now, Aluminum is higher than copper, thus, it would displace it (from CuCl2, a reaction will occur). However, Aluminum is lower than magnesium. Thus, it will not displace it from its salt (MgCl2 and no reaction will occur)

Answer: your Answer is D. Increases

Explanation:

1 mole of So2 is produced in the formation of 1 mole of I2.

Oxidation and reduction is based on the addition or removal of oxygen or hydrogen atoms.so in the terms of oxygen and hydrogen the oxidation and reduction can be defined. The addition of oxygen to substances is called oxidation or the removal of hydrogen from a substance is also called oxidation. similarly, addition of hydrogen to a substance is called reduction or the removal of oxygen from a substance is called reduction.

Here in the process of oxidizing i- to i2,so42- is reduced to so2.so the required reaction becomes,

      2I-(aq) +So42- (aq) +4H+ --> I2(s) +So2(g) +2H2O

From the reaction it can be seen that 1 mole of So2 is produced in the formation of 1 mole of I2 .

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Answer

Procedure

Considering the following chemical equation, which is already balanced

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

We assume there is enough oxygen to react with all propane and thus, propane is the limiting reactant

Therefore we use the equation to determine the amount of propane

189.68g CO₂ /

doAnswer:

Explanation:

i  don¨t lf it rigtht but i thnk it C3h8 an a thank u

Scientist discovered a species that doesn’t have any organelles. organism could it be Bacteria.

Organelles are the tiny organs of the cell. organelles have one or more than one jobs to perform. The most important cell organelles is nuclei. Bacteria is single cell organism having cellular DNA  and no organelles.  Bacteria belongs to prokaryotic cells. Prokaryotic cells are smaller than the eukaryotic cells. Prokaryotic cell do not have nucleus and do not have organelles. You can find bacteria in almost everywhere in earth. some bacteria can survive in extreme temperature and pressure.

Thus, Scientist discovered a species that doesn’t have any organelles. organism could it be Bacteria.

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The correct order for the hydrolysis of sucrose reaction is sucrose(H2O)>sucrase>glucose>fructose.

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The change that occured when the chemistry teacher mixed two clear substances and a solid forms is a chemical change.

A chemical change is a process in which reactants are changed into products by the breaking or creation of chemical bonds.

On the other hand, a physical change is a change affecting the form of a chemical substance, but not its chemical composition.

The characteristics of a chemical change are as follows;

Therefore, the formation of a precipitate when the teacher mixed two clear substances is an example of chemical change.

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Answer:At STP, the sample contains the same amount of molecules as 3.0 liters of H2 (g) is 3.0 L of CH4 (g)

Explanation:

Consider a galvanic cell with a beaker of sulfuric acid and a beaker of nitric acid the sulfuric acid beaker contains a strip of tin, and the nitric acid cell contains a strip of platinum a wire runs between the strips then Sn in the cell undergoes oxidation

Galvanic cell is the electrochemical cell that convert the chemical energy into electrical energy

Here given data is

beaker of sulfuric acid and a beaker of nitric acid the sulfuric acid beaker contains a strip of tin, and the nitric acid cell contains a strip of platinum. a wire runs between the strips then the reaction is

Sn(s) + 2NO₃⁻(aq) + 8H⁺(aq) → 3Sn²⁺(aq) + 2NO(g) + 4H₂O(l)

So in this reaction the Sn oxidizes to Sn²⁺ and the number of oxidation increases from 0 to +2 by removing the 2 electron that's is called oxidation process

Sn → Sn²⁺ + 2e

Oxidation is the process removal of electron

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The coefficients A)4,1,2 will show that matter is conserved in this chemical reaction

It is given that the equation is,

_Fe +_0₂ → _Fe₂0,

To balance the equation, the atoms in the reactants should be equal to the atoms in the products. Here, the number of atoms of Iron and Oxygen is to be found out and the same applies to the product side which already has 2 atoms of iron and one atom of oxygen

If we add 4 atoms and one atom of oxygen then the product side could be balanced by adding 2atoms of Fe₂0.

This would create a balanced equation on both sides. Thus, the balanced equation would be

4Fe +0₂ → 2Fe₂0,

This gives 4 atoms of Iron and 2 atoms of Oxygen on both sides thus making the equation balanced. Thus, the correct option is a)4,1,2

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An acid-base reaction occurs when a fatty acid interacts with NaOH, and the fatty acid transfers a proton to the base to produce sodium carboxylate salt and water.

Triglycerides are converted into glycerol and "soap" when they are saponified, or reacted with sodium or potassium hydroxide (lye). The triglycerides are often made of vegetable or animal fats. A hard soap is created when sodium hydroxide is used.

Fats, oils, or lipids (the acid) are turned into soap by the process of saponification by mixing them with sodium hydroxide (the base). Friction and heat from the chemical reaction are essential. The neutralization of the acid and base occurs during saponification.

Thus, any type of fat and sodium hydroxide react chemically in a process known as saponification.

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Answer: Earth's core is the very hot, very dense center of our planet.

Explanation:

I could be wrong though I am sorry if I am I am trying to help but tbh I am not good at school

The formation of the solar system has something to do with why planets have various compositions. The planets eventually developed from a disk of material that was spinning around the Sun in the early solar system.

The Sun and the asteroids that orbit it make up the gravitationally bound system known as the Solar System. The Sun contains the great majority of the system's mass, with Jupiter holding the lion's share of the remaining mass.

Seismic waves, or the shock waves emitted by earthquakes at or near the surface, have been measured during the majority of core research. With variations in pressure, temperature, and rock composition, seismic body waves' velocities and frequencies are also affected.

According to a recent study, certain planets outside our solar system might be rocky like Earth, but devoid of its goopy metallic core. The lack of magnetic fields on such "coreless" terrestrial planets would make them hostile to life as we know it.

Thus,  The planets eventually developed from a disk of material that was spinning around the Sun in the early solar system.

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The temperature, T2, is 359°C.

1st) We need to identify the volume and the temperature of the gas in the point A (initial state of gas) and point B (final state of gas):

- Point A:

V1= 1.65x10^3 L

T1= 43°C (316K)

-Point B:

V2= 3.30x10^3 L

T2= unknown

2nd) With the Ideal Gas Law and assuming there is no change in pressure or amount of gas in the balloon, we calculate the temperature in point B with the formula that relates temperature and volume:

It is important to use the units of the ideal gas constant, so the units must be in Kelvin (K) and liters (L). That's why the temperature (T2) it is 316 K.

3rd) Finally, it is necessary convert the Kelvin unit into Celsiud degrees:

So, the temperature, T2, is 359°C.

0.4  is(rf value) the when the solvent moves 8.0 cm and a component in a sample being analyzed moves 3.2 cm from the baseline.

Solvent is that part of a solution which completely dissolves the solute to form the solution.

(rf value) is the ratio of the distance travelled by the solute and the solvent from the baseline.

Given:

solvent displacement=8.0 cm

component displacement =3.2cm

now to find the  follow the steps

(rf value) =Component moves/Solvent moves

(rf value)=3.2/8.0=0.4

(rf value)=0.4

Hence, 0.4(rf value)  is the  when the solvent moves 8.0 cm and a component in a sample being analyzed moves 3.2 cm from the baseline.

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Answer:

The answer is A. True

Explanation:

hope i helped

A. True

Atom in simple terms is the basic singular unit into which matter can be divided without any use or discharge of energy.

One of the major reasons for having multiple atomic models over the years is that atom and their parts, subatomic particles, are invisible.

This is where the atomic models came into play. Atomic models were theories about the structure and working of atoms based on the information that was available at that time.

The first atomic model was proposed by J.J Thomson, which is also called the plum pudding model. It proposed that within the atom there were negatively charged particles (electrons) that were floating in a positively charged liquid

The atomic model used today is Schrodinger's atomic model.

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The approximate amount of heat produced by the reaction is 2884 J

We'll begin by calculating the mass of the solution.

Volume of HCl = 50 mL

Volume of NaOH = 50 mL

Total volume = 50 + 50 = 100 mL

Density of solution = 1 g/mL

Mass of solution =?

Mass = Density × Volume

Mass = 1 × 100

Mass of solution = 100 g

Next, we shall determine the change in the temperature.

Initial temperature (T₁) = 22 °C

Final temperature (T₂) = 28.9 °C

Change in temperature (ΔT) = ?

ΔT = T₂ – T₁

ΔT = 28.9 – 22

ΔT = 6.9 °C

Finally, we shall determine the heat produced by the reaction. This can be obtained as follow:

Mass of solution = 100 g

Change in temperature (ΔT) = 6.9 °C

Specific heat capacity (C) = 4.18 J/g°C

Heat (Q) = ?

Q = MCΔT

Q = 100 × 4.18 × 6.9

Q ≈ 2884 J

Thus, the approximate amount of heat produced by the reaction is 2884 J

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When the electrons of neon sign tube involve in transition from the excited state back to the ground state, photons are released. They will therefore generate an emission spectrum.

Neon gas is placed into a neon sign tube, which is then put on a high voltage to excite the electrons. The glow is brought on by the release of energy in the form of packets or just photons when these electrons return to their ground state.

There is a certain atom arrangement in neon gas. Or, to put it another way, there are atoms that will stop a continuous spectrum in its tracks. So in this instance, a line spectrum is inevitable.

High voltage causes these electrons in the neon gas to become excited. Atoms don't take in energy. So no absorption will be there.

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The time required for the same volume of helium to pass through the hole under the same conditions will be 14 seconds.

what is graham's law of diffusion?

Thomas Graham developed Graham's Law, also referred to as the "Graham's Law of Effusion," in 1848. Thomas Graham conducted experiments with the effusion process and identified a crucial characteristic: lighter gas molecules move more quickly than heavy ones.

Graham's Law states that at constant pressure and temperature, molecules or atoms having a lower molecular mass will effuse more quickly than those with a larger molecular mass. Thomas even discovered the speed at which they diffuse away. It means that the square root of a gas's molecular mass is inversely proportional to the rate of effusion of that gas.

How to find the time required for helium from graham's law of diffusion?

Graham's law of diffusion is given by

[tex]\frac{Rate 1}{Rate 2}[/tex] = [tex]\sqrt{\frac{M1}{M2} }[/tex], where Rate 1 is rate of diffusion for 1 ( volume per time) and Rate 2 is rate of diffusion for 2 ( volume per time).

M1, M2 are molecular weight of 1 & 2

In our  case 1 → Methane, 2→ Helium

Molecular weight of methane([tex]CH_{4}[/tex]) → 16

Molecular weight of Helium ( He) → 4

Substituting in equation 1, [tex]\frac{Rate of Methane}{Rate of Helium}[/tex] =[tex]\sqrt{\frac{4}{16} }[/tex] = [tex]\sqrt{\frac{1}{4} }[/tex]=  [tex]\frac{1}{2}[/tex]

[tex]\frac{Rate of Methane}{Rate of Helium}[/tex]  = [tex]\frac{1}{2}[/tex]

Now, Rate of methane = [tex]\frac{Volume}{Time}[/tex]=[tex]V_{methane}[/tex] / 28

It is given that

[tex]V_{methane}[/tex] = [tex]V_{Helium}[/tex] = V

Let, time taken by helium  be t

∴Rate of methane  = [tex]\frac{V}{28}[/tex]

Rate of Helium = [tex]\frac{V}{t}[/tex]

Substituting above values in equation (2),

[tex]\frac{\frac{V}{28} }{\frac{V}{t} }[/tex] = [tex]\frac{1}{2}[/tex]

[tex]\frac{t}{28}[/tex] = [tex]\frac{1}{2}[/tex]

t = 14 seconds.

Therefore time required by helium = 14 seconds.

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Answer:alkali metal cation

Explanation:

Part C the answer is Δ[S8]/Δt = 0.0026 M/s

Parte D the answer is v = 0.0026 M/s

Electrons are said to be delocalized electrons

Delocalized electrons are electrons in a molecule, ion, or solid metal that are not associated with a single atom or covalent connection. Electrons that have been delocalized are trapped within an orbital that spans many neighboring atoms.

Because electrons can freely roam within these molecular orbitals, each electron becomes separated from its parent atom. Delocalization refers to electrons. The strong forces of attraction between the positive nuclei and the delocalized electrons hold the metal together.

As a result, in a metallic link, electrons are free to flow freely from one atom to the next across the metal and are not bound to a specific atom; these electrons are referred to as delocalized electrons.

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0.4 moles Pb(NO3)2  must be added to 0.10 l of a solution in order to precipitate.

Molar concentration of the solution is the amount of the solute present in one unit of a solution. .it is expressed as mol/l.

 Molar concentration = Moles of solute / volume of the solution

In a 1.0 M MgCl2. there is 2 moles of Cl-

In 0.1 L of solution there is: ( 0.1/1.0. x 2 moles of Cl- ions ) = 0.2 moles Cl- .In 0.1 L of solution there is: ( 0.1/1.0. x 2 moles of Cl- ions). =. 0.2 moles Cl-.

Total moles of Cl- ions are =0.4 moles Cl- .

molecular mass of pb(NO3)2 = 331.2g

Molecular mass of 1 chloride ion = 35.45g

1 mole of Cl- ions = 35.45g

0.4 moles of Cl- =. [0.4/1.0 x35.45g) =14.18g Cl-

0.4 moles of pb (NO3)2 = [ 0.4/1.0 ] x 331.2 g = 132.48g pb(NO3)2

Moles of pb(NO3)2 =  132.48g /331.2 g moles =. 0.4 moles of pb(NO3)2

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