The same amount of heat transferred into identical masses of different substances produces different temperature changes. Calculate the final temperature when 1.00 kcal of heat transfers into 1.00 kg of steel, originally at 20.00; c = 0.108 kcal/kg 0C .

29.3 0 C


26.9 0 C


32.3 0 C


27.4 0 C

Answer:

128.4 m

Explanation:

3.604m + 104.29m + 3.1m + 17.41m

Add all the values

= 128.404 m

The significant figure rule for addition is for the sum to have the same number of decimal places as the value with the least number of decimal places. In the addition sentence 3.604m + 104.29m + 3.1m + 17.41m, the value with the least number of decimal places is 3.1, which has 1 decimal place. Therefore, we round our sum so that it also has 1 decimal place.

128.404 m

= 128.4 m

I hope this helps!

To balance the equation and identify the type of reaction, let's start by assigning coefficients to each compound: 2H2O + 1SO3 -> 1H2SO4

To balance the equation, we need to ensure that the number of atoms on both sides is the same. Here, we have two hydrogen (H) atoms on the left side and two on the right side, so hydrogen is already balanced.

We have two oxygen (O) atoms on the left side and four on the right side, so we need to balance oxygen by adding a coefficient of 2 in front of the water molecule:

2H2O + 1SO3 -> 1H2SO4

Now the equation is balanced with two hydrogen, four oxygen, and one sulfur (S) atom on both sides.

The type of reaction represented by this equation is a combination or synthesis reaction. In a combination reaction, two or more substances combine to form a new compound. In this case, water (H2O) and sulfur trioxide (SO3) combine to form sulfuric acid (H2SO4).

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In the balanced equation \(2C_{2} H_{6}\) + \(7 O_{2}\) --> \(4 CO_{2}\) + \(6H_{2}O\) if 21 g of \(C_{2} H_{6}\) reacts with 32 g O₂, C₂H6 is the limiting reactant.

To determine the limiting reactant, we need to compare the amount of each reactant to the stoichiometric ratio in the balanced equation.

Let's calculate the number of moles for each reactant using their molar masses:

For \(C_{2} H_{6}\) (ethane):

Molar mass of \(C_{2} H_{6}\) = 2(12.01 g/mol) + 6(1.01 g/mol) = 30.07 g/mol

Number of moles of C₂H6 = 21 g / 30.07 g/mol ≈ 0.698 mol

For O₂ (oxygen):

Molar mass of O₂ = 2(16.00 g/mol) = 32.00 g/mol

Number of moles of O₂ = 32 g / 32.00 g/mol = 1.00 mol

Next, we compare the moles of each reactant to the stoichiometric ratio in the balanced equation:

2 moles of \(C_{2} H_{6}\) react with 7 moles of O₂ to produce 4 moles of CO₂ and 6 moles of H₂O.

From the given amounts, we have:

0.698 mol \(C_{2} H_{6}\) and 1.00 mol O₂.

Using the stoichiometric ratio, we can calculate the expected amount of CO₂ and H₂O produced for each reactant:

For C₂H6:

Expected moles of CO₂ = 0.698 mol C₂H6 * (4 mol CO₂ / 2 mol C₂H6) = 1.396 mol CO₂

For O₂:

Expected moles of CO₂ = 1.00 mol O₂ * (4 mol CO₂ / 7 mol O₂) ≈ 0.571 mol CO₂

Comparing the expected moles, we see that the calculated amount of CO₂ is greater when used \(C_{2} H_{6}\) as the limiting reactant. Therefore, the limiting reactant in this reaction is \(C_{2} H_{6}\).

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The ionic equation of the reaction between hydrogen sulfide and MnO4- is as follows:

5H2S + 2MnO4- + 6 H+ → 2(Mn)2+ + 8H2O + 5S

According to this question, hydrogen sulfide reduces MnO4- to Mn2+, in an aqueous solution.

Elemental sulfur is produced as a gaseous product. The net ionic equation of this reaction is as follows:

5H2S + 2MnO4- + 6 H+ → 2(Mn)2+ + 8H2O + 5S

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Answer:

Gases have molecules which stay loose from each other.

So gas can be compressed easily.

Solids have molecules closely to each other.

So compressing solids can be harder.

Explanation:

Hope my explanation helps ♥️♥️♥️

The decomposition of N\(_2\)O to N\(_2\) and  O\(_2\) is a first-order reaction. At 730°C, the rate constant of the reaction is  1.94 * 10⁻⁴ min⁻¹. If the initial pressure of N\(_2\)O is 5.10 atm at 730°C, 5.875 atm is the total pressure after one half life.

The force delivered perpendicularly to an object's surface per unit area across which this force is dispersed is known as pressure (symbol: p as well as P). The pressure in relation to the surrounding air pressure is known as gauge pressure, often written gage pressure.

2N\(_2\)O(g) → 2N\(_2\)(g) + O\(_2\)(g)

k= 1.94 * 10⁻⁴min⁻¹

Half period = 0.693 / k

                    =0.693/ 1.94 * 10⁻⁴

                    = 3572 min

initial pressure of N\(_2\)O, Po = 4.70 atm

pressure of N\(_2\)O after 3572 min = Pt

k= 1/t× ln P0/pt

1.94 * 10⁻⁴ = 1/3572× ln 4.70atm / Pt

ln 4.70atm / Pt = 0.692968

4.70atm / Pt = 2.00

Pt = 4.70atm / 2.00 = 2.35 atm

                         2N\(_2\)O(g) → 2N\(_2\)(g) + O\(_2\)(g)

initial(atm)    5.10          0              0

change(atm)  -2x         +2x            x

Final(atm)         5.10-2x        2x             x

Pressure of N\(_2\)O after one half-life = Pt = 2.35 = 5.10-2x

Pressure of O\(_2\) after one half-life = Po = x = 1.175 atm

Pressure of O\(_2\) after one half-life = 2x = 2(1.175) = 2.35 atm

Total Pressure = 2.35 atm + 2.35 atm + 1.175 atm

                        = 5.875 atm

Therefore, 5.875 atm is the total pressure after one half life.

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\(Hollow \: bones \: are \: also \: called \\ pneumatized \: bones, \: meaning \: they're \: filled \\ with \: space \: for \: air. \: It \\ is \: thought \: that \: this \: structure \\  helps \: with \: oxygen \: intake \: during \\ flight. \: Air \: sacs \: are \: attached \: to \\ the \: hollow \: areas \: in \: a \: bird's \: bones. ... \\ This \: adds \: more \: oxygen \: to \\ the \: blood, \: providing \: a \\ bird \: with \:extra \:energy \:for\: flight.\)

Answer:

Birds have hollow bones so that they are light for flight  

Explanation:

K12

Answer:

Explanation:

We start by writing the dissociation equation to yield hydrogen and hydroxide ion

We have that as:

We have been told that the dissociation is 100% complete.

What this means is that the concentration of the acid is the concentration of the hydrogen ion

Thus, we have it that:

a)

B) Mathematically:

We proceed to substitute for the concentration of the hydrogen ion:

c) Mathematically:

d) Mathematically:

Answer:

Window

Explanation:

There is no explonation

Answer:

clear I think if not possibly White

The option with the largest density is B) A sample of metal that occupies 24.7 cm³ and weighs 326 g.

The largest density is the highest value of density in a set of values. In other words, it is the value that represents the greatest amount of mass per unit volume. For example, if we have a set of densities such as 2 g/cm³, 5 g/cm³, 8 g/cm³, and 12 g/cm³, the largest density would be 12 g/cm³.

Therefore, Density is defined as mass per unit volume

The option with the largest density is B) A sample of metal that occupies 24.7 cm³ and weighs 326 g.

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Option c is the right response. The correct mathematical operation to convert a sample's atom count to its mole count is atoms/number Avogadro's.

Every atom is made up of a nucleus and maybe one or more electrons. The nucleus is made up of one or more protons and several neutrons. Only the most common type of hydrogen is devoid of neutrons. Hydrogen is a chemical element with atomic number 1 and the letter H. Hydrogen is the lightest atom. Under normal conditions, hydrogen is a gas composed of diatomic molecules, which have the formula H2. It is highly combustible, non-toxic, and devoid of flavour, smell, or colour.

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Answer:

Your answer should be the Waxing Gibbous

Explanation:

Hope this helps :) Have a great day!

When 3.25grams of sodium acetate trihydrate were mixed in a test tube inside a calorimeter the temperature of water was increased by 15.5. the reaction is   the heat of solution of sodium acetate trihydrate is endothermic and the process of recrystallisation is exothermic.

Sodium acetate trihydrate is a hydrated compound an when solid sodium acetate trihydrate is heated above 59°C it will looses it hydration of water and  dissolve in that water . and the salt of sodium acetate trihydrate is fully dissolved at 79°C. the heat of solution of sodium acetate is endo thermic and the reverse process and we add seed crystal to it and when it crystallize back the process then said to be exothermic process that means it gives out heat.

therefore, When 3.25grams of sodium acetate trihydrate were mixed in a test tube inside a calorimeter the temperature of water was increased by 15.5. the reaction is   the heat of solution of sodium acetate trihydrate is endothermic and the process of recrystallisation is exothermic.

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Answer:

When most substances lose or gain energy, one of two things happens to the substance: its temperature changes or its state changes. The temperature of a substance is related to the speed of the substance’s particles. So, when the temperature of a substance changes, the speed of the particles also changes. But the temperature of a substance does not change until the change of state is complete.

Explanation:

hope this helps,

                      noah

Answer:

2.109 atm

Explanation:

This is Gay-Lussac's Law when the temperature of a sample of gas in a rigid container is increased, the pressure of the gas increases as well. The increase in kinetic energy results in the molecules of gas striking the walls of the container with more force, resulting in a greater pressure. Gay-Lussac's Law states that the pressure of a given mass of gas varies directly with the absolute temperature of the gas, when the volume is kept constant. Gay-Lussac's Law is very similar to Charles's Law, with the only difference being the type of container.

So for this one:

\(\frac{P_{1} }{T_{1}} =\frac{P_{2} }{T_{2}}\)

Rearrange it to

P2= (P1 x T2)/T1

P2= (450 x 1.5)/320 = 2.109 atm

option a,b,c are correct.gather your belongings,turn off all hot plates & other heating apparatus, turn off all water these are options that must be done in case of a fire alarm or other evacuation .

To guarantee your safety, take prompt action when the fire alarm goes off. The fire alarm system was created and constructed to give you a head start so you may safely leave the building in an emergency.Never dismiss a warning or believe it to be fake or the outcome of a test.The nearest and safest exit and/or stairs must be used by everyone to leave the building.Never leave during a fire alarm activation in an elevator.Once outside, make your way away from the structure. Gather on the sidewalk of the building next door or across the street.The firefighters and fire engines will be working in front of the structure. Don't stand in their way as they enter the building.

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Water has low viscosity and low surface tension.

Viscosity refers to the resistance of a fluid to flow, and water has a relatively low viscosity compared to many other liquids. This property is important for many applications, including the movement of water through pipes and the flow of water in rivers and streams.

Surface tension, on the other hand, is the measure of the cohesive force between molecules at the surface of a liquid. Water has a relatively low surface tension compared to some other liquids, which makes it easier for objects to penetrate its surface. This property is also responsible for the formation of droplets and the behavior of water striders and other water-dwelling insects.

Overall, these properties contribute to the unique characteristics of water and its importance in many natural and industrial processes.

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Answer:

We need more? What else is in the question? This is unanswerable.

Explanation:

According to the given statement There is thus no net charge on the surface.

Protons can be added to an atom or other substance with a neutral charge to produce a positive charge. A neutrally charged item can also acquire a positive charge by having its electrons removed. The positive end of a battery, also known as the cathode, attracts electrons because of its positive charge.

A neutron is a subatomic particle with a positive charge. Protons are held together in the atom's nucleus by the strong nuclear force. The neutron is a kind of subatomic particle without charge (they are neutral).

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We will assume that the gas behaves like an ideal gas, so we can apply the following equation for ideal gases:

Where,

P is the pressure of the gas in atm, 7.7394 atm

V is the volume of the gas in liters, 26.22L

R is a constant, 0.08206atm.L/mol.K

T is the temperature of the gas in Kelvin, 423°C=696.15K

n is the number of moles

Now, we clear the number of moles and replace the known data:

Answer: There are 0.2815 mol of carbon dioxide

Answer:

buoyancy. ...

Explanation:

........

Answer:

buoyancy

Explanation:

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The grams of magnesium hydroxide needed to yield 8.00 moles of magnesium chlorate is approximately 466.64 g. None of the options provided match the calculated value of 466.64 g.

To determine the grams of magnesium hydroxide (Mg(OH)2) needed to yield 8.00 moles of magnesium chlorate (Mg(ClO3)2), we need to consider the balanced chemical equation for the reaction between magnesium hydroxide and chlorine.

The balanced equation is as follows:

2 Mg(OH)2 + 6 Cl2 → 2 Mg(ClO3)2 + 2 H2O

From the balanced equation, we can see that 2 moles of Mg(OH)2 react with 6 moles of Cl2 to produce 2 moles of Mg(ClO3)2.

Therefore, the stoichiometric ratio is 2 moles of Mg(OH)2 : 2 moles of Mg(ClO3)2.

To calculate the grams of Mg(OH)2 needed, we can use the stoichiometric ratio and the given moles of Mg(ClO3)2.

Given:

Moles of Mg(ClO3)2 = 8.00 moles

Using the stoichiometric ratio, we have:

8.00 moles Mg(ClO3)2 × (2 moles Mg(OH)2 / 2 moles Mg(ClO3)2) = 8.00 moles Mg(OH)2

To convert moles to grams, we need to multiply by the molar mass of Mg(OH)2.

The molar mass of Mg(OH)2 = (24.31 g/mol) + (2 * 16.00 g/mol) = 58.33 g/mol

Grams of Mg(OH)2 = 8.00 moles Mg(OH)2 × 58.33 g/mol = 466.64 g

Therefore, the grams of magnesium hydroxide needed to yield 8.00 moles of magnesium chlorate is approximately 466.64 g.

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Answer:

isotopes, there elements with a diffrent type atomic weight then the original, usally due to a higher amout of neutrons than the original. Some Isotopes are just as useable as the normal versions, but in some cases, such as Uranium, they can be even more radioactive than the original form

Many island chains were formed as a result of blank volcanism is known as hotspot volcanism.

Hotspot volcanism occurs when a mantle plume, a column of hot and buoyant rock material rising from deep within the Earth's mantle, reaches the surface. These mantle plumes are stationary relative to the moving tectonic plates on the Earth's surface.

As the tectonic plate moves over the stationary hotspot, the mantle plume melts and produces magma. This magma rises through the Earth's crust, creating a volcanic eruption. Over time, repeated eruptions build up layers of lava and volcanic material, forming a cone-shaped volcano. As the tectonic plate continues to move, the volcano becomes inactive, and a new volcano forms above the stationary hotspot.

However, in the case of island chains, the tectonic plate movement carries the volcanoes away from the hotspot. As a result, a trail of extinct volcanoes is left behind, forming a linear chain of islands. Each island in the chain represents a period of volcanic activity at that specific location as the plate moved over the hotspot.

Hotspot volcanism and the formation of island chains provide valuable insights into the dynamics of Earth's mantle and plate tectonics. By studying the age progression of islands in a chain, scientists can gain a better understanding of the movement and speed of tectonic plates and the behavior of mantle plumes deep beneath the Earth's surface.

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Answer:

A chemical reaction is a process in which one or more substances, also called reactants, are converted to one or more different substances, known as products. ... A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.

Explanation:

Hopefully this is what you needed

We can see here that the catalytic cycle for the hydrogenation of alkenes using Wilkinson's catalyst involves several steps.

Here's an overview of the catalytic cycle, including the necessary details:

i. Chemical structure of the catalyst:

Wilkinson's catalyst, also known as chloridotris(triphenylphosphine)rhodium(I), has the following chemical structure: [RhCl(PPh3)3]

ii. Molecular geometry of the catalyst:

The Wilkinson's catalyst has a trigonal bipyramidal geometry around the rhodium center. The three triphenylphosphine (PPh3) ligands occupy equatorial positions, while the chloride (Cl) ligand occupies an axial position.

iii. Type of reactions involved:

The catalytic cycle involves several reactions, including:

iv. Starting material, reagent, and solvent:

The starting material is an alkene, and the reagent is Wilkinson's catalyst ([RhCl(PPh3)3]). The reaction is typically carried out in a suitable solvent, such as dichloromethane (CH2Cl2) or tetrahydrofuran (THF).

v. Major and minor end-products:

The major end-product of the hydrogenation reaction is the fully saturated alkane, resulting from the addition of hydrogen across the double bond. The minor end-product may include cis- or trans-configured alkanes if the original alkene substrate possesses geometric isomers.

vi. Intermediates:

The intermediates in the catalytic cycle include:

These intermediates play a crucial role in facilitating the hydrogenation reaction and enabling the catalytic cycle to proceed.

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Answer:

the final state of the hydrogen atom = 3

Explanation:

From the given information;

Let first calculate the amount of energy by the ground state atom during the atoms absorbs  photon light  by using the formula:

\(E_{absorbs} = \dfrac{hc}{\lambda}\)

where;

h = planck's constant = \(6.626*10^{-34 }\ \ Js\)

c = speed of light = \(3.0*10^8 \ \ m/s\)

λ = wavelength = 92.57 nm = 92.57 × 10⁻⁹ m

\(E_{absorbs} = \dfrac{6.626*10^{-34 }\ \ Js * 3.0*10^8 \ \ m/s}{92.57*10^{-9} \ \ m}\)

\(E_{absorbs} = 2.15 *10^{-18} \ J\)

The energy emitted by the hydrogen atom is calculated by using the same formula from above ; but here , the wavelength λ = 954.3 nm = 954.3 × 10⁻⁹ m

\(E_{absorbs} = \dfrac{6.626*10^{-34 }\ \ Js * 3.0*10^8 \ \ m/s}{954.3*10^{-9} \ \ m}\)

\(E_{absorbs} = 2.08 *10^{-19} \ J\)

The change in the energy absorbed is:

\(\Delta E= 2.15 *10^{-18} \ J - 2.08 *10^{-19} \ J\)

\(\Delta E= 1.94 *10^{-18} \ J\)

The final state of the atom can be determined by using the relation:

\(\Delta E = R_H [\dfrac{1}{1^2}-\dfrac{1}{n^2_f}]\)

where;

\(R_H\) = Rydberg constant = 2.18 × 10⁻¹⁸ J

\(\dfrac{\Delta E}{R_H} = [\dfrac{1}{1^2}-\dfrac{1}{n^2_f}] \\ \\ \\ \dfrac{1.94*10^{-18} \ J}{2.18*10^{-18} \ J } = [\dfrac{1}{1^2}-\dfrac{1}{n^2_f}] \\ \\ \\ 0.889 = [\dfrac{1}{1^2}-\dfrac{1}{n^2_f}] \\ \\ \\ 1 - 0.889 = \dfrac{1}{n^2_f} \\ \\ \\ 0.111= \dfrac{1}{n^2_f} \\ \\ \\ {n^2_f} = \dfrac{1}{0.111} \\ \\ \\ {n^2_f} = 9 \\ \\ \\ {n_f} = \sqrt{9} \\ \\ \\ \mathbf{n_f = 3}\)

Thus; the final state of the hydrogen atom = 3

\(E_a_b_s_o_r_b_e_d = (6.626 * 10^-^3^4 J.s) * (3.00 * 10^8 m/s) / (92.57 *10^-^9 m)\)We can use the fact that the energy of the photon is given by the equation: to determine the final position of the hydrogen atom.

E = hc / λ

Where:

E is the energy of the photon,

h is Planck's constant \((6.626 * 10^-^3^4 J.s)\),

c is the speed of light in a vacuum \((3.00 * 10^8 m/s)\), and

λ is the wavelength of the photon.

Let's first determine the energy of the absorbed photon:

\(E_a_b_s_o_r_b_e_d = hc /\)λ\(_a_b_s_o_r_b_e_d\)

\(E_a_b_s_o_r_b_e_d = (6.626 * 10^-^3^4 J.s) * (3.00 * 10^8 m/s) / (92.57 *10^-^9 m)\)

The energy of the photon released will then be determined by:

\(E_e_m_i_t_t_e_d = hc\) / λ\(_e_m_i_t_t_e_d\)

E\(_e_m_i_t_t_e_d\) = \((6.626 * 10^-^3^4 J.s) * (3.00 * 10^8 m/s) / (945.3 *10^-^9 m)\)

The energy difference between the absorbed and released photons must now be determined:

ΔE = \(E_e_m_i_t_t_e_d - E_a_b_s_o_r_b_e_d\)

The energy levels of hydrogen are given by the equation:

ΔE = -13.6 eV *\((1 / n^2_f_i_n_a_l - 1 / n^2_i_n_i_t_i_a_l)\)

Where

\(n_f_i_n_a_l\) and \(n_i_n_i_t_i_a_l\) are the principal quantum numbers of the final and initial states, respectively, and -13.6 eV is the ionization energy of hydrogen.

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Answer:

2257000 J

Explanation:

Applying,

Q = Cₓm.................. Equation 1

Where Q = amount of energy need to boil the water, Cₓ = Enthalpy of vaporization of water, m = mass of water.

From the question,

Given: Cₓ = 2257000 J/kg, m = 1 kg

Substitute these values into equation 1

Q = 2257000×1

Q = 2257000 J

Hence the energy needed to boil all of the water is 2257000 J