True or false:In order for an electron to go back to the ground state, the atom emits the excess energy in the form of a photon, a particle of light. Each element will produce a unique line spectrum because each element has different energy levels

Answer:

percentage composition = 13.2%

Explanation:

percentage of magnesium in magnesium bromide can be found by molar mass of magnesium over molar mass of magnesium bromide.

Molar mass of elements can be found using a standard IUPAC Periodic Table.

M(Mg) = 24.31 g/mol

M(MgBr₂) = 24.31 + 79.90×2 = 184.11 g/mol

∴ percentage composition = 13.2%

Explanation:

OK thank you so much I hope you are well

Answer:

Answer:

Calcium chloride is used in medication to help treat people who have low levels of calcium in their body. It helps supplement the necessary amount of calcium needed for healthy functioning.

Explanation:

Answer:

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Explanation:

Based on the given information, we can plot the data points on the blank graph to see the effect of speed on kinetic energy:

Vertical axis: Kinetic Energy (Joules)

Horizontal axis: Speed (meters per second)

Define the term kinetic energy.

The energy an object has as a result of its motion is known as kinetic energy. It is a scalar quantity and is defined as one-half of the product of an object's mass and the square of its velocity. Mathematically, it can be represented as:

        Kinetic Energy = 1/2 x mass x [tex]velocity^{2}[/tex]

where mass is the mass of the object in kilograms and velocity is the speed of the object in meters per second.

Kinetic energy is a form of mechanical energy and can be transferred between objects in collisions or other interactions. It is a fundamental concept in physics and is used to understand and describe the behavior of moving objects in various physical systems.

The data points are:

Trial 1: Mass=2, Speed=1, Kinetic Energy=1

Trial 2: Mass=2, Speed=2, Kinetic Energy=4

Trial 3: Mass=2, Speed=3, Kinetic Energy=9

Trial 4: Mass=2, Speed=4, Kinetic Energy=16

Therefore, The graph shows that as the speed increases, the kinetic energy also increases. The relationship between speed and kinetic energy is quadratic, which means that the kinetic energy increases with the square of the speed.

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Answer:

the water is being observed a bi paper towel material through a process called capillary action capital reaction on Sonu's capability is a rising or absorption

Answer: The water spreads out and covers a larger area on the paper towel.

A) To calculate the total bond energy, we need to know the bonds broken and formed in the reaction. In this case, the reactants are C₂H₄ and H₂, and the product is C₂H₆.

Reactants:

C₂H₄ has one C=C bond and four C-H bonds. Total bond energy

= (1 x 614 kJ/mol) + (4 x 413 kJ/mol) = 2462 kJ/mol

H2 has one H-H bond. Total bond energy

= 1 x 436 kJ/mol = 436 kJ/mol

Products:

C₂H₆ has six C-H bonds and one C-C bond.

Total bond energy

= (6 x 413 kJ/mol) + (1 x 348 kJ/mol) = 2862 kJ/mol

Total energy = reactant energy - product energy = (2462 kJ/mol + 436 kJ/mol) - 2862 kJ/mol = 36 kJ/mol

Therefore, the total bond energy for the reaction is 36 kJ/mol.

B) The reaction is exothermic because the total energy is negative (-36 kJ/mol). This means that energy is released when the reaction occurs.

C) The formation of C-C bond releases energy (348 kJ/mol), and the breaking of C=C bond requires energy input (614 kJ/mol). The formation of four C-H bonds releases energy (4 x 413 kJ/mol = 1652 kJ/mol), and the formation of two additional C-H bonds releases more energy (2 x 413 kJ/mol = 826 kJ/mol). The breaking of one H-H bond requires energy input (436 kJ/mol).

The total energy released by the formation of new bonds is greater than the energy required to break the old bonds, resulting in an exothermic reaction.

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The value of the equilibrium constant is independent of the initial concentration of the reactants. It has a definite value for every reversible reaction at a particular temperature.

The equilibrium constant can be defined as the ratio of the product of molar concentrations of the products to that of the reactants with each concentration term raised to a power equal to its coefficient in the balanced chemical equation.

The expression of the equilibrium constant is:

Keq = [AD]² [BD]² [C]⁴ / [AB]²[CD]⁴

Thus the expression of the equilibrium constant is determined.

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If 4 moles of oxygen are produced, 2.66 moles of potassium chloride are produced in the given laboratory preparation.

What is mole concept?

Avogadro's number is the number of units in one mole of any substance and equals to 6.02214076 × 10²³. The units can be electrons, atoms, ions, or molecules.

No. of moles is defined as a particular no. of particles that we can calculate with the help of Avogadro’s number.

Given,

laboratory preparation for oxygen gas:

2KClO₃ (s) —------> 2KCl (s) + 3O₂ (g)

Moles of oxygen = 4 moles

When 3 moles of oxygen are produced 2 moles of potassium chloride are produced.

When 1 mole of oxygen are produced 2/3 moles of potassium chloride are produced.

Hence, 4 moles of oxygen are produced (2÷3)×4 = 2.66 moles of potassium chloride are produced.

Therefore, if 4 moles of oxygen are produced, 2.66 moles of potassium chloride are produced in the given laboratory preparation.

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Answer:0.146 torr

Explanation:

Yes to the gas constant

you use 0.0821 L.atm/mol.k  If you want pressure in atm

use 62.44 L.torr/ mol.k  if you want pressure in torr

n=PV/RT

n= 722.4 X 3.79/(62.44 X 300) =

Explanation:

1a) c since c is the biggest part of the pie chart

1b) 25% as it is close to a quarter

quarter=25%

1c) A=10%

1d) I think Mr.M's class was difficult since 35% of people got decent grades (a and b). As that is a percentage less than half of the class i would consider that as a difficult class.

Hope this helped.

The specific rotation of a substance is a measure of its ability to rotate the plane of polarized light. It is usually denoted by the symbol [α] and is expressed in degrees per unit length and concentration.

The specific rotation of (R)-(-)-monosodium glutamate is -2.4° (or -2.4 degrees) when measured in a 1-decimeter cell at a concentration of 10 g/100 mL in water. The negative sign indicates that the rotation is counterclockwise or left-handed, which is typical for most amino acids.

Note that the specific rotation of a substance can vary depending on the wavelength of light used and the temperature at which the measurement is taken. Therefore, it is important to specify these parameters when reporting the specific rotation of a substance.

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Explanation:

Refer to pic..... .. .....

Given the volume of the 0.500 M sodium chloride solution is 500 mL. Then, the volume of 0.100 M sodium chloride solution is 2500 ml.

Molarity of a solution is the ratio of its number of moles of solute to the volume of solution in liters. It is the common term to express the concentration of a solution.

The product of molarity and volume then being the number of moles of solute in the solution. Let V1 and M1 be the volume of molarity of a solution and V2 and M2 be the volume and concentration of the diluted solution.

then,

M1 V1 = M2 V2

Given,

M1 = 0.500 M

V1 = 500 mL

M2 = 0.100 M

then V2 = M1 V1/ M2

V2 = 0.500 M × 500 ml /0.100 M

     = 2500 ml.

Therefore, the volume of the diluted solution is 2500 ml.

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The ion AT3 has a total of 22 valence electrons: 5 from A and 6 from T, multiplied by 3 since there are three T atoms.

Generally,  To determine the number of coordinate covalent bonds, we need to draw the Lewis structure and check the formal charges.

If A donates three electrons to each T atom, it will have a formal charge of +2 (5 valence electrons - 3 donated electrons - 0 non-bonding electrons). Each T atom will have a formal charge of -1 (6 valence electrons - 3 donated electrons - 2 non-bonding electrons).

The Lewis structure for AT3 will have single bonds between A and each T atom, and each T atom will have a lone pair of electrons.

The total number of electrons used in the bonds is 6 (2 from each bond). The remaining 16 electrons will be distributed among the three T atoms as lone pairs.

Therefore, there are no coordinate covalent bonds in the ion AT3.

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Answer: 0.25 atm

Explanation:

a) 107.1 g of hydrosulfric acid can be formed.

b) Aluminium sulfide is the limiting reactant.

c) 378g of excess reactant remains.

d) 52.75 % is the percent yield.

The limiting reactant or limiting reagent is a reactant in a chemical reaction that determines the amount of product that is formed.

Identification of the limiting reactant can help calculate the theoretical yield of a reaction.

Given the reaction,

2Al₂S₃ + 6 H₂O = 2Al(OH)₃ + 3H₂S

Mass of aluminium sulfide = 316g

Mass of water = 493 g

Moles = Mass ÷ molar mass

Moles of Aluminium sulfide = 316 ÷ 150

=  2.10 moles

Moles of water = 493 ÷ 18

= 27.3 moles

Since moles of aluminium sulfide is less, it is the limiting reagent.

From the reaction, 2 moles of aluminium sulfide gives 3 moles of H₂S.

1 moles of Al₂S₃ will give 3 ÷ 2 moles of H₂S.

Thus, 2.1 moles of Al₂S₃ will give 1.5 × 2.1 moles

                                 = 3.15 moles of H₂S

Mass of H₂S = Moles × molar mass

                                  = 3.15 × 34 = 107.1 g

From the reaction, 2 moles of aluminium sulfide gives 6 moles of H₂O.

1 mole will need 3 moles of water.

Thus, 2.1 moles will need 3 × 2.1 moles = 6.3 moles of water

Excess of water = 27.3 - 6.3 = 21 moles

Mass of excess reactant = 21 × 18 = 378g

Actual yield of  H₂S = 203g

Theoretical yield = 107.1 g

% yield = (107.1 × 100) ÷ 203 = 52.75 %

Therefore,

a) 107.1 g of hydrosulfric acid can be formed.

b) Aluminium sulfide is the limiting reactant.

c) 378g of excess reactant remains.

d) 52.75 % is the percent yield.

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According to the solving 0.0427 g of NaCl is needed to react completely with 35.2 mL of 0.1 M AgNO3.

A chemical reaction is an event in which reactants chemically reacts and transform into products chemically. As an illustration, during respiration, oxygen is inhaled and combines with glucose to create carbon dioxide, water, and energy.

K₂CrO₄ + 2 AgNO₃ → 2 KNO₃ + Ag₂CrO₄

the moles of AgNO3 used in the reaction with K2CrO4 is:

n(AgNO3) = (14.6 mL) (0.1 mol/L)

= 1.46 × 10⁻³ mol

Since the same amount of AgNO3 is used in the reaction with NaCl, we can calculate the moles of NaCl needed to react completely with 35.2 mL of 0.1 M AgNO3:

n(NaCl) = n(AgNO3) / 2

= (1.46 × 10⁻³ mol) / 2

= 7.3 × 10⁻³ mol

To calculate the mass of NaCl needed, we can use its molar mass:

M(NaCl) = 58.44 g/mol

Mass of NaCl needed = n(NaCl) x M(NaCl)

= (7.3 × 10⁻⁴ mol) x (58.44 g/mol)

= 0.0427 g

0.0427 g of NaCl is needed to react completely with 35.2 mL of 0.1 M AgNO3.

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There is a different way to contribute to the CO₂ budget balance besides reducing or turning off this carbon, which would help reduce the amount of greenhouse gases in the atmosphere. However, that depends on the precise amount of carbon that the oceans, trees, and plants are absorbing.

The carbon sinks in the cycle have so far had plenty of extra capacity. In fact, since we began burning fossil fuels for energy after the Industrial revolution, about half of the carbon dioxide emissions released into the atmosphere have naturally cycled away again.

A quarter of this carbon dioxide dissolves in water, so the oceans have absorbed it. As they used sunlight to turn it into glucose and oxygen during photosynthesis, plants use up an additional quarter.

The airborne carbon that was captured now exists as trees or is buried in peat, grassland, and soils. It is submerged in the water, dissolving in the deep ocean, or drifting as sediment on the seafloor. In other words, the planet has improved.

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The statement that is true about strong electrolytes , weak electrolytes , and non-electrolytes is:

Silver chloride (AgCl) is insoluble in water; option D.

Chloride (Cl-) ion is soluble in water; option C

Potassium iodide (KI) and silver nitrate (AgNO₃) will result in a precipitate, according to solubility rules; option D.

Dilute solutions have a higher solvent-to-solute ratio than concentrated solutions; option A.

The volume of sodium chloride solution required is calculated using the formula:

Where:

M1 = 0.500 M (initial concentration)

V1 = volume of initial solution (unknown)

M2 = 0.100 M (final concentration)

V2 = 500 mL = 0.500 L (final volume)

Rearranging the formula to solve for V1, we get:

V1 = M2V2/M1

V1 = (0.100 M)(0.500 L)/(0.500 M)

V1 = 0.100 L

The volume of the 0.500 M sodium chloride solution required is 0.100 L.

15. The volume of the original solution required will be;

M1V1 = M2V2

Where:

M1 = 0.500 M (initial concentration)

V1 = volume of initial solution (unknown)

M2 = 0.100 M (final concentration)

V2 = 250 mL = 0.250 L (final volume)

Rearranging the formula to solve for V1, we get:

V1 = M2V2/M1

V1 = (0.100 M)(0.250 L)/(0.500 M)

V1 = 0.050 L or 50.0 mL

The volume of the original 0.500 M hydrochloric acid solution needed is 50.0 mL.

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Answer:

The feedback loop involving water vapor and temperature is a positive feedback loop. As temperature increases, the amount of water vapor that can be held in the atmosphere also increases. This leads to an increase in the amount of water vapor in the atmosphere, which further amplifies the greenhouse effect and contributes to additional warming.

In other words, warmer temperatures lead to more water vapor in the atmosphere, which traps more heat, causing further warming, and so on. This positive feedback loop can amplify the initial warming effect caused by other factors such as greenhouse gas emissions or changes in solar radiation.

Conversely, if the temperature decreases, the amount of water vapor that can be held in the atmosphere decreases, which can lead to a decrease in the amount of water vapor present in the atmosphere, reducing the greenhouse effect and contributing to cooling. However, this negative feedback loop is weaker than the positive feedback loop described above, and it tends to be dominated by the positive feedback loop under most circumstances.

The statement that describes the formation of galaxies is "Gravity causes stars to cluster."

What is galaxies ?

The statement that describes the formation of galaxies is "Gravity causes stars to cluster."

Galaxies form from the accumulation of gas, dust, and dark matter through the force of gravity. As the gas and dust in a galaxy cluster together, they begin to collapse under their own gravity, forming stars. Over time, these stars cluster together and form galaxies. Therefore, the correct statement that describes the formation of galaxies is gravity causes stars to cluster.

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From the table, it is very clear that as the crystallinity increases, its stiffness also increasing. The FCC structures are having less crystallinity and is more ductile than BCC structure.

Ductility of a material is the ability to make very thin elongated wires. Whereas, stiffness of a material is the resistance to any elongation or compression.

The more crystalline the material, more will be the stiffens. The material with higher Young's modulus  (Y) are more crystalline and stiff. As Y decreases, stiffness decreases, the material becomes ductile.

Because the body-centered cubic (BCC) lattice is not tightly packed despite being cubic, the face-centered cubic (FCC) crystalline structure has greater ductility than the BCC.

Due to the fact that a hexagonal close-packed (HCP) lattice is densely packed but not cubic, HCP metals are less ductile than BCC and FCC metals.

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Answer:

4.20 atm

Explanation:

PV = nRT

convert the temperature from Celsius to Kelvin:

T(K) = T(C) + 273.15

T(K) = 17 + 273.15

T(K) = 290.15 K

plug in the values:

n = 0.4 moles

V = 7.0 L

R = 0.08206 L atm / (mol K) (Gas constant)

T = 290.15 K

PV = nRT

P = nRT / V

P = (0.4 moles) x (0.08206 L atm / (mol K)) x (290.15 K) / (7.0 L)

P = 4.20 atm (rounded to two significant figures)

Therefore, the pressure of the gas is 4.20 atm.

6.84 is the pOH of a solution that has a [OH⁻] value 5.8 x 10⁻⁹. The correct option is option B among all the given options.

The concentration of hydroxide ions (OH-) is measured by pOH. It can be employed to express a solution's alkalinity.

Aqueous solutions containing pOH less than 7 at 25 degrees Celsius are alkaline, pOH larger than 7 are acidic, as well as pOH equal to 7 constitute neutral.

pOH = -log[ OH ]

pOH = -log[ 5.8 x 10⁻⁹ ]

        = 5.84

Therefore, 6.84 is the pOH of a solution that has a [OH⁻] value 5.8 x 10⁻⁹. The correct option is option B among all the given options.

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Explanation:

The atomic model is a scientific theory that describes the structure and behavior of atoms. In the early 20th century, scientists began to develop new models of the atom as they discovered more about its properties. One of the earliest models was proposed by J.J. Thomson in 1897, which suggested that the atom was a sphere of positive charge with negatively charged electrons embedded within it. This model was later replaced by the Rutherford model in 1911, which showed that the atom had a small, dense nucleus surrounded by orbiting electrons. The modern quantum mechanical model of the atom, which is widely accepted today, uses complex mathematical equations to describe the behavior of electrons within atoms. To create an accurate model, scientists must use experimental data, such as the energy levels of electrons, the wavelengths of light emitted by atoms, and the positions of spectral lines, to calculate the probabilities of where electrons are likely to be found within the atom. The resulting model allows scientists to make predictions about how atoms will behave under different conditions, and it has many practical applications in fields such as chemistry, physics, and engineering.

Answer:

Atomic models are representations of the structure of an atom. They are important tools in understanding the behavior of atoms and their interactions with other atoms. In creating an atomic model, scientists must first gather and analyze experimental data to determine the properties and behavior of the atoms. They then use mathematical equations and theories, such as quantum mechanics, to develop a model that accurately represents the observed behavior of the atoms. The model must take into account the position and movement of the electrons around the nucleus, as well as the various energy levels of the electrons. By studying atomic models, scientists have been able to make important discoveries about the nature of matter and the fundamental forces that govern the behavior of atoms.

Explanation:

One mole of potassium carbonate decompose to give one mole or 32 g of oxygen. Hence, 10 g of potassium carbonate will give 2.31 g of oxygen gas.

Decomposition is type of reaction in which the one compound breaks into its constituent elements and compounds. Potassium carbonate is an ionic compound which can decomposed on heating to given CO and oxygen gas as follows:

[tex]\rm K_{2}CO_{3} \rightarrow 2 K + O_{2} + CO[/tex]

As per this balanced chemical equation of the decomposition, one mole of potassium carbonate produces one mole of oxygen gas.

molar mass of potassium carbonate = 138 g/mol

molecular mass of O₂ = 32 g/mol

Hence, 138 g of potassium carbonate gives 32 g of oxygen gas. Then, 10 g of potassium carbonate will give

(10 × 32)/138 = 2.31 g.

Therefore, the mass of oxygen formed from 10 g of potassium carbonate will be 2.31 g.

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Explanation:

Refer to pic............

Answer:

Carbon dioxide

Explanation:

Carbon dioxide gas is used by plants for the preparation of food materials. During this food preparation process, plants take up carbon dioxide from the air and give up oxygen.

It is believed that tectonic plates move as a result of convection in the asthenosphere and gravity.

According to the widely recognized scientific hypothesis known as plate tectonics, the Earth's lithosphere is made up of many sizable tectonic plates that have been steadily moving for nearly 3.4 billion years.

A tectonic plate, also known as a lithospheric plate, is a sizable slab of solid rock with an uneven shape that is typically made up of both continental and oceanic lithosphere. The Pacific and Antarctic Plates are among the largest plates, but they can range in size from a few hundred to thousands of kilometers broad.

Thus, it follows that convection in the asthenosphere and gravity are thought to be the causes of tectonic plate movement.

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