Consider:
2Al (s) + 3Cl2 (g) ----> 2AlCl3 (s) ΔH=-1390.81 kJ

Which of the following correctly describes he magnitude and direction of the enthalpy change when 10.0g of AlCl3 forms?

a. 104.4 kJ, exothermic
b. 52.2 kJ, exothermic
c. 26.1 kJ, exothermic
d. 52.2 kJ, endothermic
e. 26.1 kJ, endothermic

Answer: 8.89M

Explanation:

The non-metal elements in Group 7 – known as the halogens – get less reactive as you go down the group

Answer & Explanation:

The reactivity of elements in Group VII, also known as Group 17, decreases with increasing atomic radius. This is because halogens have high electronegativities and a proclivity to gain electrons in noble gas configurations. Myths are traditional stories or beliefs that explain cultural or societal beliefs, customs, or natural phenomena. They can be passed down through generations and can be based on true or fictitious events. Mythology, on the other hand, is the collection of myths associated with a specific culture or religion. Mythology can be amplified through retelling, incorporation into religious practices; association with significant events or figures, and adaptation into other media forms such as literature, film, or art.

The plum-pudding model suggested a uniform distribution of electrons within a positively charged atom, whereas the Bohr atomic model introduced the concept of quantized energy levels and specific orbits for electrons.

The Bohr atomic model and the plum-pudding model are two distinct models that were proposed to explain the structure of atoms, and they differ in their fundamental concepts.

The plum-pudding model, also known as the Thomson model, was proposed by J.J. Thomson in 1904. According to this model, an atom consists of a positively charged sphere (the "pudding") with embedded negatively charged electrons (the "plums").

In other words, the electrons were thought to be uniformly distributed throughout the positively charged atom. This model suggested that the atom was overall neutral and did not contain any distinct substructures.

On the other hand, the Bohr atomic model, proposed by Niels Bohr in 1913, introduced the concept of quantized energy levels within an atom. According to this model, electrons orbit the nucleus in specific, discrete energy levels or shells.

These energy levels are represented by fixed orbits or paths, with electrons occupying only certain allowed orbits. The model also introduced the idea that electrons can transition between energy levels by emitting or absorbing energy in discrete packets called photons. This model explained phenomena like atomic spectra and the stability of atoms.

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According to the question the rate of the reaction at =0 is 8.0 × 10−9 M2·s−1.

A reaction is an action or response to a stimulus. It can be a physical or mental response to the environment, or it can be a chemical reaction that occurs when two or more substances interact with each other. Reactions can be conscious or unconscious, and can involve emotions, memories, thoughts, or behaviors. All reactions are the result of some kind of change that occurs in the body or environment. Reactions can be beneficial or detrimental, depending on the situation. Learning how to recognize and control your reactions can help you make better decisions and lead a healthier, more successful life.

The rate of the reaction at =0 can be calculated by substituting the values of [O3] and [NO] into the rate law:
rate of reaction=[O3][NO]
= (4.0 × 10−4 M) (2.0 × 10−5 M)
= 8.0 × 10−9 M2·s−1
Therefore, the rate of the reaction at =0 is 8.0 × 10−9 M2·s−1.

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Answer:

When the candle is lit and burning, it has kinetic energy.

Explanation:

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Option (c) is correct All of these choices:

Sorbitol is one of the main photosynthetic end products and serves as a storage and transport sugar in most plant families. Synthesis of sorbitol takes place by catalysis of glucose via NADP-dependent sorbitol-6-phosphate dehydrogenase (S6PDH). Sorbitol is further degraded to fructose by NAD+ sorbitol dehydrogenase in sink tissues. It plays an important role in osmotic adjustment in cell cytoplasm under various abiotic stresses such as salinity, chilling, and drought .Sorbitol is slowly absorbed by passive diffusion in the small intestine.Sorbitol is a white, hygroscopic, crystalline powder. It melts at 97°C and has excellent pH and heat stability in food processing.

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Answer:

1) The quantum number l can have values from

2 to 0

2)The total number of orbitals possible at the n = 3 energy level is 3'2=9

3) If the value of l = 3 ... The quantum number ml can have values from 3 to -3

The quantum number l determines the shape of the orbital.  In this case, if the value of n is 3, then the quantum number l can have values from 0 to (3-1), which is 2.

The total number of orbitals possible at the n = 3 energy level can be determined using the formula 2l + 1. So, for l = 0, there is 1 orbital. For l = 1, there are 3 orbitals. And for l = 2, there are 5 orbitals. Therefore, the total number of orbitals possible at the n = 3 energy level is 1 + 3 + 5 = 9.

On the other hand, the quantum number ml represents the magnetic quantum number. It specifies the orientation of the orbital in space. The value of ml ranges from -l to +l. So, if the value of l is 3, then the quantum number ml can have values from -3 to +3.

The total number of orbitals possible at the l = 3 sublevel can be determined using the formula 2ml + 1. So, for ml = -3, there is 1 orbital. For ml = -2, there is 3 orbitals. For ml = -1, there is 5 orbitals. For ml = 0, there is 7 orbitals. For ml = 1, there is 5 orbitals. For ml = 2, there is 3 orbitals. And for ml = 3, there is 1 orbital.

Therefore, the total number of orbitals possible at the l = 3 sublevel is 1 + 3 + 5 + 7 + 5 + 3 + 1 = 25.

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Answer:

Here is the answer from somewhere in the internet

5.678 plus 82.5 equals 88.178. The solution should be rounded to the least amount of decimal places in any of the numbers, which is one decimal place in 82.5 as both values contain three significant figures.

Therefore, 88.2 is the final response, rounded to the proper significant digits.

The number of meaningful digits in a number is referred to as a significant figure. They are crucial for computations and measurements in science since they show how precise a measurement was.

The least precise measurement or value used in the calculation usually determines the number of significant numbers in a measurement or calculation.

The final result should be rounded to the same number of decimal places or significant figures as the calculation's least exact number when adding or subtracting values with differing amounts of decimal places or significant figures.

In this instance, 5.678 contains four significant figures, but 82.5 has three. The final result should therefore be rounded to three significant digits.

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Answer:

In paper chromatography, the wet moving edge of the solvent that progresses along the surface where the separation of the mixture is occurring.

Explanation:

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Answer:

Explanation:

No not always but it is more likely they will

Answer:

\(T_F=38.7\°C\)

Explanation:

Hello,

In this case, considering that the copper is initially hot and the water is initially cold, we can infer that the heat lost by the copper is gained by the water as follows:

\(\Delta H_{Cu}=-\Delta _{w} H\)

Which can be written in terms of temperatures, masses and heat capacities (390 mL equals 390 g for water).

\(m_{Cu}Cp_{Cu}(T_F-T_{Cu})=-m_{w}Cp_{w}(T_F-T_{w})\)

In such a way, solving for the final temperature we obtain:

\(T_F=\frac{m_{Cu}Cp_{Cu}T_{Cu}+m_{w}Cp_{w}T_{w}}{m_{Cu}Cp_{Cu}+m_{w}Cp_{w}} \\\\T_F=\frac{248g*0.385J/(g\°C)*314\°C+390g*4.18J/(g\°C)*22.6\°C}{248g*0.385J/(g\°C)+390g*4.18J/(g\°C)} \\\\T_F=38.7\°C\)

Regards.

The final temperature will be "38.71°C".

Let,

By applying the formula, we get

→ \(- (Specific \ heat\times Mass\times Temp \ Change) for \ copper = (Specific \ heat\times Mass\times Temp \ Change) for \ water\)

By substituting the values, we get

→ \(-0.385\times 248\times (T-314) =4.184\times 390\times (T-22.6)\)

→               \(-95.48(T-314) = 1631.76(T-22.6)\)

→     \(-95.48 T+314\times 95.48=1631.76-22.6\times 1631.76\)

→                           \(1727.24 T=66858.496\)

→                                       \(T = \frac{66858.496}{1727.24}\)

                                            \(= 38.71^{\circ} C\)

Thus the above answer is correct.

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In 1 hour, 2.344 × 10¹⁶ kJ of solar energy reaches the United States.

The entire area of the United States is 9,158,960 km². We will convert it to m² using the conversion factor 1 km = 10³ m, squared.

\(9,158,960 km^{2} \times (\frac{10^{3} m }{1km} )^{2} = 9.158960 \times 10^{12}\ m^{2}\)

In order to find the amount of solar energy that reaches 9.158960 × 10¹² m² we will use another conversion factor: 2559 kJ of energy reaches a square meter of the United States in one hour.

\(9.158960 \times 10^{12}\ m^{2} \times \frac{2559 kJ}{m^{2}.h } = 2.344 \times 10^{16} kJ/h\)

In 1 hour, 2.344 × 10¹⁶ kJ of solar energy reaches the United States.

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It will be used 1.95 grams of the reactant in the reaction.

To calculate the density of a given substance, use the following expression:

                                                     \(d = \frac{m}{v}\)

Thus, having the values ​​of volume and density, just apply the formula above to find the value of mass, so that:

                                               \(0.975 = \frac{m}{2}\)

                                            \(m= 1.95 grams\)

So, it will be used 1.95 grams of the reactant in the reaction.

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Hydrogen (H₂) would take 52.8 moles of H₂ to make 600 grams of NH₃.

What are the moles?

The molar mass of NH₃ is 17.03 g/mol (14.01 g/mol for nitrogen and 3.02 g/mol for hydrogen).

To determine the number of moles of H₂ required to make 600 grams of NH₃, we need to first find the number of moles of NH₃:

moles NH₃ = mass of NH₃ / molar mass of NH₃

moles NH₃ = 600 g / 17.03 g/mol

moles NH₃ = 35.2 mol

According to the balanced chemical equation, 3 moles of H₂ are required to produce 2 moles of NH₃.

So, the number of moles of H₂ required to make 35.2 moles of NH₃ would be:

moles H₂ = (3/2) x moles NH₃

moles H₂ = (3/2) x 35.2 mol

moles H₂ = 52.8 mol

Therefore, it would take 52.8 moles of H₂ to make 600 grams of NH₃.

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Complete question is: Hydrogen (H₂) would take 52.8 moles of H₂ to make 600 grams of NH₃.

a) The balanced chemical equation for the reaction is: 2H₂ + O₂ → 2H₂O

b) the number of moles of O₂ required is approximately 1.004 moles.

c)  approximately 45 liters of H₂ and 22.5 liters of O₂ are needed to obtain 45 liters of H₂O.

a) Balancing the chemical equation:

The balanced chemical equation for the reaction is: 2H₂ + O₂ → 2H₂O

b) Calculating the number of moles of the reactants needed to obtain 45 liters of H₂O:

From the balanced equation, we can see that for every 2 moles of H₂O produced, we need 2 moles of H₂ and 1 mole of O₂. Since the stoichiometry is based on moles, we need to convert the given volume of H2O into moles.

To convert volume to moles, we need to use the ideal gas law, PV = nRT. At standard temperature and pressure (STP), the molar volume of an ideal gas is 22.4 liters.

Given that we have 45 liters of H2O, we can calculate the number of moles as follows:

moles of H₂O = (volume of H₂O) / (molar volume at STP)

            = 45 liters / 22.4 liters/mol

            ≈ 2.008 moles of H₂O

Since the stoichiometry of the reaction is 2 moles of H₂O for every 2 moles of H₂, we need an equal number of moles of H₂. Therefore, the number of moles of H₂ required is also approximately 2.008 moles.

For O₂, since the stoichiometry is 1 mole of O₂ for every 2 moles of H₂O, we need half the number of moles of H₂O. Thus, the number of moles of O₂required is approximately 1.004 moles.

c)  the volume of the reactants:

Since the stoichiometry of the balanced equation is 2 moles of H₂for every 1 mole of O₂ and 2 moles of H₂O, we can deduce the volume of the reactants based on their molar volumes at STP.

For 2.008 moles of H₂, the volume can be calculated as follows:

volume of H₂= (moles of H₂) * (molar volume at STP)

            = 2.008 moles * 22.4 liters/mol

            ≈ 45 liters of H₂

For 1.004 moles of O₂, the volume can be calculated similarly:

volume of O₂= (moles of O₂) * (molar volume at STP)

            = 1.004 moles * 22.4 liters/mol

            ≈ 22.5 liters of O₂

Therefore, approximately 45 liters of H₂and 22.5 liters of O₂ are needed to obtain 45 liters of H₂O

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Answer:

Explanation:

If a zero is found between significant digits, it is significant

When designing a scientific question, you should ensure the question is:

A scientific question is an inquiry that scientists examine via methods such as observation, experimentation or data collection leading to an answer.

They often require specific parameters for setting up experiments along with means for measuring outcomes or phenomenon under investigation while also needing testable results to establish validity. As such successful ones must possess traits like precision in defining boundaries within which observations will take place making them measurable so they may produce documented evidence supporting the validity of their findings

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Answer:

7.859 g/cm³.

Explanation:

Density = Mass/Volume

the mass of the iron sample is 27.3162g and its volume is 3.475 cm³, so calculate its density as:

Density = 27.3162g/3.475 cm³ = 7.859 g/cm³

Therefore, the density of the iron sample is 7.859 g/cm³.

Answer:

Explanation:

20mL = 0.020L

0.115M = mol/0.02L

mol=0.0023

equivalence point → mols of weak acid = mols of strong base

0.1014 = 0.0023/volume

volume = 0.02268 L → 22.68 mL

To know the end point we use phenolphthalein as indicator. End point is a point where completion of reaction happen. Therefore, volume of base is 22.6ml.

Titration is a technique by which we know the concentration of unknown solution using titration of this solution with solution whose concentration is known.

The balanced equation between sulfurous acid and potassium hydroxide.

KOH + H₂SO\(_3\) →K\(_2\)SO\(_4\) +H\(_2\)O

concentration of sulfurous acid= 0.115 M

Volume of  sulfurous acid= 20.0-mL

Concentration of potassium hydroxide=0.1014 M

Volume of potassium hydroxide= ?

At equivalent point,

moles of  H₂SO\(_3\)      moles of KOH

                      M₁×V₁=M₂×V₂

    0.115 M×20.0-mL = 0.1014 M×V₂

                              V₂=22.6ml

Therefore, volume of base is 22.6ml.

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Answer:

Here's your Answer

Explanation:

the mass spectrum is the graphical representation of the ion abundance versus the mass to charge of the ions separated in mass spectrometer

Answer:

E=1.1

Explanation:

let's consider moles of E is X

3(0.20)+5(0.30)+0.10 =2X

2.2=2X

x=1.1

Cu + O2 --->  CuO2 -The first reaction is a combustion reaction

2 HCl + Mg → H2 + MgCl2- The second reaction is a Single replacement reaction

A combustion reaction is a type of chemical reaction that occurs between a fuel and an oxidizer in the presence of heat or light, resulting in the release of energy in the form of heat and light.

In other words, it is a reaction in which a substance reacts with oxygen to produce heat and light.

Combustion reactions are important in many aspects of daily life, including the burning of fossil fuels for energy production, the combustion of wood or other materials for heating or cooking, and the combustion of fuels in internal combustion engines.

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Answer:neutral

Explanation:ionic compounds is between a cation and anion so they cancel eachother out

Answer:

I think this will help you

Explanation:

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Answer:

C. Na₂SO₄(aq) + Sr(NO₃)₂(aq) → SrSO₄(s) + 2 NaNO₃(aq)

Explanation:

Based on the equation:

Na₂SO₄(aq) + Sr(NO₃)₂(aq) → SrSO₄(s) + NaNO₃(aq)

As you can see, sulfate ions (SO₄) are been replaced for nitrate ions (NO₃). That is a double replacement reaction and is a very important information because 2 NO₃ ions in Sr(NO₃)₂ are producing 1 NO₃ ion. To balance NO₃:

Na₂SO₄(aq) + Sr(NO₃)₂(aq) → SrSO₄(s) + 2 NaNO₃(aq)

1 SO₄ ion in Na₂SO₄ produce 1 SO₄ ion in SrSO₄. And Na and Sr metals are balanced yet. Thus, the balanced form of this chemical equation is:

The mass of the asteroid is C. 1.2 x \(10^{12}\) Kg

To find the mass of the other asteroid, we can rearrange the equation for the gravitational force between two objects:

F = (G * m1 * m2) / \(r^{2}\)

where F is the force of gravity, G is the gravitational constant, m1 and m2 are the masses of the two asteroids, and r is the distance between them.

Given that the distance between the asteroids is 75000 m, the force of gravity between them is 1.14 N, and one asteroid has a mass of 8 x \(10^{7}\) kg, we can substitute these values into the equation and solve for the mass of the other asteroid (m2):

1.14 N = (6.67430 × \(10^{-11}\) N \(m^{2}\)/\(Kg^{2}\) * 8 x \(10^{7}\) kg * \(m2\)) / \((75000 m)^{2}\)

Simplifying and solving the equation, we find that the mass of the other asteroid (m2) is approximately 1.2 x \(10^{12}\) kg. Therefore, Option C is correct.

The question was incomplete. find the full content below:

Two asteroids are 75000 m apart one has a mass of 8 x \(10^{7}\) kg if the force of gravity between them is 1.14 what is the mass of the asteroid

A. 3.4 x \(10^{11}\) kg

B. 8.3 x \(10^{12}\) kg

C. 1.2 x \(10^{12}\) kg

D. 1.2 x \(10^{10}\) kg

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The sections between the lines on a phase diagram represent Option B. The regions in which temperature and pressure change a substance's phase .

A phase diagram is a graphical representation that shows the conditions at which a substance exists as a solid, liquid, or gas.

It is a graph that represents the relationship between pressure and temperature under which a substance exists as a solid, liquid, or gas.

The sections between the lines on a phase diagram represent the regions in which temperature and pressure change a substance's phase.

Answer: B. The regions in which temperature and pressure change a substance's phase.

Explanation:A phase diagram is a graphical representation of the state of matter that exists under certain conditions of pressure and temperature.

A phase diagram is also known as a phase equilibrium diagram, a phase transition diagram, or a P-T diagram (pressure-temperature).

A phase diagram has three regions, solid, liquid, and gas, which are separated by phase boundaries.

Each boundary represents the conditions of temperature and pressure under which a phase change occurs.

The triple point is the point where all three phases coexist.

The critical point is the point at which the gas and liquid phases become indistinguishable.

The sections between the lines on a phase diagram represent the regions in which temperature and pressure change a substance's phase.

These sections are also called phase boundaries or phase transitions.

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Answer:

162.4 cm

Explanation:

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