How much heat is needed to increase the temperature of a 540.6 g sample of iron from 20°C to 84°C? The specific heat capacity of iron is 0.450 J/g · C

Based on these electronegativities, HCI would be expected to have polar covalent bonds and contain H+ ions.

Mathematically,

% of ionic character = 16(Xa - XB ) + 3.5(XA - Xb )

=16(3-2.1)+3.5(3-2.1)²

= 14.4+2.835

= 17.235%

:. The nature of HCI is 17.2% ionic

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Answer:

The answer is

Plant also use cellular respiration

Answer:

B - Plants also use cellular respiration.

Explanation:

Did the test.

The preferred arrangement of electrons in a molecular structure can be determined by calculating the electronic configuration of each atom in the molecule.

What is electronic configuration?

The electronic configuration of an atom is determined by the number of protons in the nucleus and the specific rules governing the filling of energy levels and orbitals. The electronic configuration is usually represented using a notation that indicates the number of electrons in each energy level or orbital.

what is delocalized electron ?

Delocalized electrons are electrons that are not restricted to a specific location or region in a molecule or material, but instead are spread out over multiple atoms or molecules. In other words, delocalized electrons are free to move throughout a larger region instead of being confined to a single atom or bond.

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9.77 litres of NO2 are generated on average.

The balanced equation for the breakdown of N2O5 is as follows:

\(2N_2O_5(g) -- > 4NO_2(g) + O_2(g)\)

determine how many moles of N2O5 decompose:

\(V(N_2O_5) / Vm = n(N_2O_5)(N_2O_5)\)

where V(N2O5) = 4.86 dm3 is N2O5's volume and Vm(N2O5) is N2O5's molar volume under the circumstances stated in the ideal gas law:

\((R*T)/P = Vm = V/n\)

when the gas constant R is used.

the kelvin scale of temperature, T

The pressure is P.

The ideal gas law:

\(n(N_2O_5) = V(N2O5) / Vm(N_2O_5) = 4.86 dm3 / (24.46 L/mol) = 0.1982 mol\)

the number of moles of NO2 is:

\(n(NO_2 = 4/2 * n(N_2O_5) = 0.3964 mol\)

then,

\(n(NO_2 = 4/2 * n(N_2O_5) = 0.3964 mol\)

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Answer:

During rock cycle deposition follows erosion.

The ion concentration of 0.05 M \(CaCl_2\) would be 0.05 mol Ca ions and 0.1 mol Cl ions respectively.

\(CaCl_2\) contains two ions according to the following equations:

\(CaCl_2 -- > Ca^{2+} + 2Cl^-\)

1 mole           1 mole   2 moles

0.05 M CaCl2 contains 0.05 moles of the solute in 1 liter of the solution. Thus, the equivalent mole of Ca ion would be 0.05 moles while that of Cl ion would be 0.10 mole (0.05x2).

Concentration of Ca ions = 0.05 moles

Concentration of Cl ions = 0.05 x 2 = 0.010 moles

In other words, the ion concentrations of 0.05 M CaCl2 would be 0.05 moles of Ca ions and 0.10 moles of Cl ions.

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The amount of heat energy produced when 1 g of hydrogen and 2 g of nitrogen are reacted, is -6.61 KJ

First, we shall obtain the limiting reactant. Details below:

3H₂ + N₂ -> 2NH₃

From the balanced equation above,

28 g of N₂ reacted with 6 g of H₂

Therefore,

2 g of N₂ will react with = (2 × 6) / 28 = 0.43 g of H₂

We can see that only 0.43 g of H₂ is needed in the reaction.

Thus, the limiting reactant is N₂

Finally, we the amount of heat energy produced. Details below:

3H₂ + N₂ -> 2NH₃ ΔH = -92.6 KJ

From the balanced equation above,

When 28 grams of N₂ reacted, -92.6 KJ of heat energy were produced.

Therefore,

When 2 grams of N₂ will react to produce = (2 × -92.6) / 28 = -6.61 KJ

Thus the heat energy produced from the reaction is -6.61 KJ

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The  AIR MASSES that would affect the climates of Florida : are maritime tropical air mass and the maritime polar air mass,

Maine : maritime polar air mass and maritime tropical air mass,

Montana :  continental polar and maritime polar air masses.

Texas :  maritime tropical air masses  and continental tropical air masses

An air mass is  described as a large body of air with generally uniform temperature and humidity.

An air mass's properties are determined by the region from which it originates. The likelihood that the air mass will take on characteristics of the surface below increases with the amount of time it spends over its source region.

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Answer:

48 moles

Explanation:

A) Keep temperature constant and increase the pressure of the reaction; reaction rate will increase.

The temperature and pressure of a reaction will affect the rate of reaction.

Pressure

Pressure and the rate of reaction have a direct relationship. This means that as one increases, so does the other. So, if the pressure increases. then the rate of reaction will also increase. This is due to the number of collisions. As pressure increases, the number of collisions between molecules increases. This causes the reaction to occur faster. Thus, the rate of reaction increases.

Temperature

Kinetic energy and temperature are proportional. This means that as temperature increases, so does kinetic energy. This leads to temperature and rate of reaction also having a direct relationship. So, temperature and rate of reaction increase and decrease together. This is due to the fact that when temperature increases, the energy of the molecules increases. This leads to an increased number of collisions. As stated above, more collisions lead to a faster reaction.

Answer:

D Cobalt

Explanation:

The volume of the sphere is  40 -25 = 15 cm^3

Density = mass/volume = 133 gm / 15 cm^3 = 8.87 gm/cm^3

  which corresponds to Cobalt from the chart

Answer: The concept behind hydroelectric power is simple: Rather than combusting fossil fuels, like coal, oil, or natural gas, which put over 52 million kilotons of greenhouse gases into the atmosphere each year, dams block the water flowing in rivers or lakes and use the force of the would-be flow to turn turbines,

Explanation:

Answer:  \(\frac{1}{\Delta H_{fusion}}\times 1kJ\times xg/mol\)

Explanation:

Latent heat of fusion is the amount of heat required to convert 1 mole of solid to liquid at atmospheric pressure.

If \(\Delta H_{fusion}\) is used to melt = 1 mole of solid

1 kJ of energy is used to melt = \(\frac{1}{\Delta H_{fusion}}\times 1kJ\)

Now if molar mass of  solid is x g/mol

Then mass of solid will be = \(\frac{1}{\Delta H_{fusion}}\times 1kJ\times xg/mol\)

Answer:

B. 1kJ x 1/ AHfusion * g/mol solid

Explanation:

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Answer:

Physical and chemical methods can be used to monitor the rate of a chemical reaction. Physical methods measure changes in properties like temperature, pressure, or volume. Chemical methods track reactant consumption or product formation using techniques like titration or spectrophotometry. The choice of method depends on the reaction being studied, and scientists use these methods to gain insight into reaction kinetics and optimize conditions for better efficiency and selectivity.

Answer:

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Approximately 766.08 grams of oxygen are required to completely react with 240g of C₂H₆.

To determine the amount of oxygen required to completely react with 240g of C₂H₆ (ethane), we need to set up a balanced chemical equation for the combustion of ethane.

The balanced equation for the combustion of ethane is as follows:

C₂H₆ + O₂ → CO₂ + H₂O

From the balanced equation, we can see that the stoichiometric ratio between C₂H₆ and O₂ is 1:3. This means that for every one mole of C₂H₆, three moles of O₂ are required for complete combustion.

To calculate the amount of oxygen required, we need to convert the given mass of C₂H₆ to moles using its molar mass, and then use the stoichiometric ratio to determine the moles of O₂ required. Finally, we can convert the moles of O₂ back to grams using the molar mass of oxygen.

The molar mass of C₂H₆ is calculated as follows:

(2 x atomic mass of carbon) + (6 x atomic mass of hydrogen)

(2 x 12.01 g/mol) + (6 x 1.01 g/mol) = 30.07 g/mol

Now, we can proceed with the calculation:

Calculate the moles of C₂H₆:

moles of C₂H₆ = mass of C₂H₆ / molar mass of C₂H₆

moles of C₂H₆ = 240 g / 30.07 g/mol ≈ 7.98 mol

Determine the moles of O₂ using the stoichiometric ratio:

moles of O₂ = moles of C₂H₆ x (3 moles of O₂ / 1 mole of C₂H₆)

moles of O₂ = 7.98 mol x 3 ≈ 23.94 mol

Convert moles of O₂ to grams:

mass of O₂ = moles of O₂ x molar mass of O₂

mass of O₂ = 23.94 mol x 32.00 g/mol = 766.08 g

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The amount of heat can be calculated from the expression of heat capacity using heat of fusion and molar mass of benzene.

159g of benzene is heated from the temperature of 53.7C.

Molar mass of benzene,C6H6= 78.11236 g/mol.

heat capacity of benzene, C6H6= 1.63 J/ G. K

The heat of fusion = 9.87 KJ / mol.

Heat of fusion is the change in its enthalpy resulting from providing energy, typically heat, to a specific quantity of the substance to change its state from a solid to a liquid at constant pressure.

Energy used in melting the solid(in JOULES) = (mass of benzene/molar mass of benzene) × heat of Fusion.

           = (159 g/ 78.11236 G/ mole ) × 9.87 kJ per mol.

           = 20.090 J

           = 0.002009 KJ

Heat capacity is also known as thermal capacity. It is a physical property of matter defined as the amount of heat to be supplied to an object to produce a unit change in its temperature

Energy= heat capacity (J/ G.K) × mass of benzene× (∆T).

           = 1.63 J/GK × 159g× 53.7

            = 13917. 42 J

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250 L of 5.0% w/v glucose solution can be prepared using 125 g of glucose.

w/v = [ mass of solute (g) / volume of solution (mL) ] × 100

5.0 % w/v = [ 125 g / volume of solution (mL) ] × 100

volume of solution (mL) = [ 125 g / 5.0 % w/v ] x 100

volume of solution (mL) = [ 125 g / (5.0 / 100) ] x 100

volume of solution (mL) = [ 125 g / 0.05 ] x 100

Answer:

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Answer

2319.698 g

Procedure

Use the Avogadro's number and then the molecular weight to convert into grams. The formula for aluminum bromide is AlBr₃.

The units for atomic mass are atomic mass units (amu).  the atomic mass of copper for this location is 63.55 amu.

The chemical symbol Cu stands for copper. Copper is a soft, malleable, ductile metal that is a good conductor of heat and electricity. Copper is one of the most widely used metals in electrical and electronic equipment due to its superior conductivity and non-corrosive properties. This metal is widely used in wiring, roofing, plumbing, and electronic applications. Its atomic mass is 63.55 amu.The atomic mass of copper for this location can be determined using the following formula:

Atomic mass = (mass of isotope 1 x relative abundance of isotope 1) + (mass of isotope 2 x relative abundance of isotope 2)The atomic mass of copper for this location

= (62.93 x 0.6915) + (64.93 x 0.3085) = 63.55 amu

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Answer: Heterogeneous (Colloid)

Explanation: This is because your solution is a colloid. A colloidal solution has particles between 40 and 900 nm and as the laser light shines through the paint and Water mixture, the paint particles scatter the light because of the Tyndall Effect (Named after the physicist John Tyndall). A Colloidal Solution is a heterogeneous solution that looks like its homogeneous but is a mixture of very small particles that don't really become a solution.

A small amount of red paint is mixed with water. When a laser pointer shines through the mixture, the beam is clearly visible in the mixture. This mixture is a Heterogeneous.

A mixture is a substance made by combining two or more dissimilar chemical compounds that are not chemically linked in chemistry. When two or more substances are physically combined, their identities are maintained, and the mixture takes the shape of solutions, suspensions, or colloids.

Chemical elements and compounds, among others, can be mechanically blended or mixed to create mixtures without causing any chemical bonding and other chemical change, preserving the chemical characteristics and makeup of each ingredient. A small amount of red paint is mixed with water. When a laser pointer shines through the mixture, the beam is clearly visible in the mixture. This mixture is a Heterogeneous.

Therefore, the mixture is Heterogeneous mixture.

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1. No. 108 g of Ag has a lower number of atoms than 80 g of Ca.

2. The gram of \(SO_3\) in 3 moles of the compound would be 240 g.

3. 1.20 x \(10^{24\) atoms

4. The grams of hydrogen in 3.6 x \(10^{24\) molecules of \(NH_3\) would be 18 grams.

According to Avogadro, 1 mole of a substance contains 6.022 x \(10^{23\) molecules or atoms.

Recall that: mole = mass/molar mass

1. 108 g of Ag would be equivalent to: 108/108 = 1 mol.

80 g of Ca would be equivalent to: 80/40 = 2 mol

Since 1 mol is equivalent to 6.022 x \(10^{23\) molecules or atoms, it means 80 g of Ca has twice as atoms as 108 g of Ag.

2. 3 mol sample of \(SO_3\) would be equivalent to: 3 x 80 = 240 g

3. 124 g of \(Na_2O\) would be equivalent to: 124/62 = 2 mol

Number of atoms = 2 x 6.022 x \(10^{23\)

                              = 1.20 x \(10^{24\) atoms

4. 3.6 x \(10^{24\) molecules of \(NH_3\) would be equivalent to:

  3.6 x \(10^{24\)/6.022 x \(10^{23\) = 6 mol of \(NH_3\)

\(NH_3 --- > 3H^+ + N^{3-\)

From the above equation, 1 mole of \(NH_3\) produces 3 moles of hydrogen.  Thus,  6 moles of  \(NH_3\) would be equivalent to 18 moles of hydrogen.

18 moles of hydrogen = 18 x 1

                                    = 18 g

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Answer:

Explanation:

The equation for the beta decay of 77Se is:3477Se --> 3377As + 10e

where the 10e is a positive beta particle or positron.