Nguyên tử của nguyên tố X có tổng số hạt 40. Tổng số hạt mang điện nhiều hơn số hạt không mang điện là 12 hạt.

Ariana is playing basketball with her friends. They are using an orange basketball. Because all visible light waves except orange are absorbed by the ball.

The correct answer is A.

The correct answer is A.

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Answer:

B. Type of music.

Explanation:

"how the type of music played in a room can affect plant growth."

The independent variable is the variable that is changed for the purpose of the experiment. The type of music is the independent variable here.

The permitted values of j for a p electron are 1/2 and 3/2 and the permitted values of j for an h electron are 9/2 and 11/2.

(a) For a p electron:
The azimuthal quantum number (l) for a p electron is 1. To calculate the permitted values of j, we use the formula:
j = l ± 1/2
So for a p electron, the permitted values of j will be:
j = 1 + 1/2 = 3/2
j = 1 - 1/2 = 1/2
Therefore, the permitted values of j for a p electron are 1/2 and 3/2.

(b) For an h electron:
The azimuthal quantum number (l) for an h electron is 5. To calculate the permitted values of j, we use the same formula:
j = l ± 1/2
So for an h electron, the permitted values of j will be:
j = 5 + 1/2 = 11/2
j = 5 - 1/2 = 9/2
Therefore, the permitted values of j for an h electron are 9/2 and 11/2.

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That oil sands executive is greedy and heartless and therefore can't be trusted when she claims is Ad hominem attack. So, Option B is correct.

4-  The argument in question 4 is an example of an ad hominem attack. This is due to the argument's focus on the character of the oil sands executuive rather than the actual problem, which is how to improve the company's environmental record.

The argument holds that the executive cannot be believed when she says she wants to improve the company's environmental record because she is avaricious and callous. This is an error in logic, though, as the executive's character may not necessarily be related to the company's environmental policies.

5-  The argument in question 5 is an example of an appeal to ignorance. This is because the argument states that there is no proof that humans are causing climate change, so it must be natural causes. Just because there is no conclusive proof that humans are causing climate change, it does not mean that they are not.

The argument assumes that just because there is no evidence to the contrary, the argument must be true. This is a logical fallacy.

So, Option B is correct.

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Answer:

the rate of heat transfer is directly proportional to the mass flow rate.

Explanation:

There is an elementary equation from basic thermodynamics that states that the rate of heat transfer (Q) equals the mass flow rate (M) times a Constant (the specific heat of water) times the Delta T (fluid temp out minus fluid temp in): Q = M x C x Delta T In other words, the rate of heat transfer is directly proportional to the mass flow rate.

Answer:

i think the answer is b or c

Answer:

c

Explanation:

the formula below for the application of KVL around i1 is KVL around loop i1: -10V + 5Ω * (I1 - I2) + 10Ω * I1 = 0.

According to Kirchhoff's Voltage Law (KVL), the sum of the voltages around a closed loop in a circuit is equal to zero. In this case, we are applying KVL around loop i1. The equation represents the sum of voltage drops in the loop, where -10V is a voltage source, 5Ω * (I1 - I2) represents the voltage drop across the 5Ω resistor due to the difference in mesh currents I1 and I2, and 10Ω * I1 represents the voltage drop across the 10Ω resistor due to the current I1. The equation is set equal to zero to satisfy KVL.

ii. KVL around loop i2: 10Ω * I2 - 5Ω * (I1 - I2) + 2V = 0

Similar to i, this equation represents the application of KVL around loop i2. The 10Ω * I2 term represents the voltage drop across the 10Ω resistor due to the current I2, the -5Ω * (I1 - I2) term represents the voltage drop across the 5Ω resistor due to the difference in mesh currents I1 and I2, and the 2V term represents a voltage source. The equation is set equal to zero to satisfy KVL.

iii. Determine the current i1: Substitute the obtained values into the equation for i1 and solve for I1 in mA.

iv. Determine the current i2: Substitute the obtained values into the equation for i2 and solve for I2 in mA.

v. Determine Vo: Substitute the obtained values for i1 and i2 into the appropriate equation representing the voltage at Vo, and calculate the value in V.

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This means that for every 1 mole of FeCl3 compound that is dissolved in water, 3 mole IONS are produced. The correct answer is A) FeCl3.

When FeCl3 is dissolved in water, it dissociates into 3 mole IONS: 1 mole of Fe3+ ions and 3 mole of Cl- ions. The dissociation equation can be written as:

FeCl3 (s) --> Fe3+ (aq) + 3Cl- (aq)

This means that for every 1 mole of FeCl3 compound that is dissolved in water, 3 mole IONS are produced. Therefore, the correct answer is A) FeCl3.

The other compounds listed in the question do not produce 3 mole IONS when 1 mole of the compound is dissolved in water. For example, (NH4)3PO4 dissociates into 3 mole of NH4+ ions and 1 mole of PO43- ions, for a total of 4 mole IONS. AgNO3 dissociates into 1 mole of Ag+ ions and 1 mole of NO3- ions, for a total of 2 mole IONS. LiClO dissociates into 1 mole of Li+ ions and 1 mole of ClO- ions, for a total of 2 mole IONS. Ti(SO4)2 dissociates into 1 mole of Ti4+ ions and 2 mole of SO42- ions, for a total of 3 mole IONS.

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Answer:

81.6%

Explanation:

mass of acetylferrocene and ferrocene mixture = 22.092 g

mass ratio acetylferrocene and ferrocene mixture = 1 : 1

The sum of the ratios = 2, therefore the mass of each compound will be half the mass of the mixture

mass of each compound in the sample mixture = 1/2 * 22.09 2= 11.046 g

mass of recovered acetylferrocene = 9.017 g

percentage recovery = mass recovered/mass in sample * 100%

percentage recovery of acetylferrocene = (9.017 g / 11.046 g) * 100%

percentage recovery of acetylferrocene = 81.6%

Answer:

electrons.

Answer:

27.5°C = Final Temperature of the metal

Explanation:

The change in temperature using the specific heat of a material could be obtained using the formula:

Q = m*S*ΔT

Where Q is heat absorbed in Joules = 128J in the problem

m is the mass of the substance = 10.5g

S is Specific Heat of the substance = 0.449J/g°C for Iron

ΔT is change in temperature = Final T - Initial T

Replacing:

128J = 10.5g*0.449J/g°C*ΔT

2.5°C = ΔT

2.5°C = Final T - 25°C

Answer:

Zn + 2HCl => ZnCl2 + H2

Explanation:

This equation represents salt formation or salt preparation. Thus not a neutralization reaction.

The nuclear equation which describes the neutron-induced fission of U-235 to form Kr-93 and Ba-140 is given as follows:

\(_235U^+10n^\)  →  \(_93Kr^ + _140Ba^ + xn^\)

Here, xn represents the number of neutrons that are produced in the reaction.

To find the value of xn, we must first balance the equation. The sum of atomic numbers and the sum of the mass numbers on both sides of the reaction must be equal.

To balance the atomic number, we need to add a total of 54 protons (36 for Kr and 54 for Ba) on the right side. This means that the left side of the equation must have 54 protons as well.

Since uranium has 92 protons, we need to add 54 - 92 = -38 protons to the left side. This implies that a total of 38 neutrons must be added to the left side.

\(_235U^ + 10n^\) →  \(_93Kr^ + _140Ba^ + 3n^\)

Therefore, the number of neutrons produced in the reaction is 3.

The balanced nuclear equation is:

\(_235U^ + 10n^\)  →  \(_93Kr^ + _140Ba^ + 3n^\)

The given equation represents the nuclear fission of Uranium-235 upon neutron absorption which is a type of nuclear reaction in which the nucleus of an atom splits into two or more smaller nuclei as well as some additional particles such as neutrons and photons.

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The conversion of 2 - butanol to 2 - nitrobutane​ involves conversion of  2 butanol to 2 - bromobutane and subsequently to 2 - nitrobutane.

In order to convert 2 - butanol to 2 - nitrobutane​, an SN2 reaction is first carried out in which 2 - butanol  is converted to 2 - bromobutane. This reaction proceeds with inversion of configuration at the chiral carbon as expected.

This product is subsequently reacted with silver nitrite in ethanol to yield  2 - nitrobutane​ along side silver bromide. Some alkyl nitrite is also produced as a by product. The components of the mixture are separated by fractional distillation. The scheme of the reaction is shown in the image attached to this answer. This reaction is only applied to primary and secondary alkyl halides.

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To separate the mixture of water, salt, iron filings, sand, and Styrofoam, you can follow the following steps:

By following these steps, you can separate the different components of the mixture effectively.

The synthesis of nylon requires solutions of 5% hexamethylenediamine and 5% adipoyl chloride. This polymer will form between layers of the solutions. To remove the nylon, one can choose to dissolve it in the 5% hexamethylenediamine or in the 5% adipoyl chloride.

Nylon, a synthetic polymer, is produced from the combination of adipoyl chloride and hexamethylenediamine. This process is called the synthesis of nylon. Nylon is a highly flexible material that is resistant to wear and tear, as well as chemical and heat degradation. The synthesis of nylon requires solutions of 5% hexamethylenediamine and 5% adipoyl chloride, respectively, for the two reactants to be mixed together.

The reaction between these two chemicals is exothermic, which means that it releases heat. The heat generated in the reaction drives the reaction forward, resulting in the formation of nylon. The chemical formula for nylon is (-CO-NH-)n, where n is a large number that reflects the degree of polymerization. To remove the nylon, it is soaked in an acid solution. The acid dissolves the nylon, separating it into its constituent components, which can then be purified and reused.

The most commonly used acid for this process is hydrochloric acid. The process of removing nylon from its solvent is called the "acid-catalyzed hydrolysis of nylon." Nylon is used in a variety of applications, including textiles, packaging materials, and electrical components, among others. Its properties make it ideal for use in applications that require durability, strength, and flexibility. Nylon's physical properties, including its resistance to heat and chemical degradation, make it ideal for use in applications such as electrical insulation, packaging materials, and textiles.

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approximately 0.27 grams of BaF2 will be dissolved in 125 mL of the saturated solution of BaF2.

How to solve the problem?

The solubility product constant (Ksp) for BaF₂ is given as 1.50 x 10⁻⁶. This means that at equilibrium, the product of the concentration of Ba₂₊ and F- ions will be equal to Ksp.

The balanced equation for the dissolution of BaF₂ is BaF₂(s) ⇔ Ba₂₊(aq) + 2F-(aq).

We can use the Ksp value to determine the concentration of Ba₂₊ and F- ions in a saturated solution of BaF₂

Let x be the molar solubility of BaF₂. Then, the concentration of Ba₂₊ ions in the saturated solution will be x mol/L, and the concentration of F- ions will be 2x mol/L, according to the stoichiometry of the balanced equation.

The Ksp expression can be written as:

Ksp = [Ba₂₊][F-]²

Substituting the expressions for the concentrations of Ba₂₊ and F- ions, we get:

Ksp = x (2x)⅝ = 4x³

Solving for x, we get:

x³= Ksp / 4 = 1.50 x 10⁻⁶/ 4 = 3.75 x 10⁻⁷

x = (3.75 x 10⁻⁷)¹/³ = 0.0077 mol/L

This means that the molar solubility of BaF₂ is 0.0077 mol/L in water.

To determine the mass of BaF₂ that will be dissolved in 125 mL of this saturated solution, we can use the following formula:

mass = concentration x volume x molar mass

The molar mass of BaF₂ is 175.32 g/mol.

The concentration of BaF₂ Is equal to its molar solubility, which is 0.0077 mol/L.

The volume of the solution is 125 mL, which is equal to 0.125 L.

Substituting these values in the formula, we get:

mass = 0.0077 mol/L x 0.125 L x 175.32 g/mol

mass = 0.27 g (approx.)

Therefore, approximately 0.27 grams of BaF₂will be dissolved in 125 mL of the saturated solution of BaF₂

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The formal charge of a nitrogen atom that has no lone pairs and forms two double bonds is +1

The formal charge of an atom is calculated by subtracting the number of lone pair electrons and half the number of bonding electrons from the number of valence electrons.

Nitrogen having atomic number 7 and electronic configuration 1s²2s²2p³ has five valence electrons. If it forms two double bonds, then it is sharing four electrons with each bond, for a total of 8 electrons. This means that nitrogen has lost 3 electrons compared to the neutral atom, due to which it will have a formal charge of +1.

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Ionic compounds tend to be solid at room temperature. They are formed by the attraction between positively charged ions (cations) and negatively charged ions (anions). These ions are held together in a lattice structure by strong electrostatic forces of attraction.

At room temperature, the thermal energy is typically not sufficient to overcome the strong ionic bonds, resulting in the solid state of most ionic compounds. The lattice structure gives them a rigid and organized arrangement of ions.

Examples of common solid ionic compounds at room temperature include sodium chloride (NaCl), potassium iodide (KI), and magnesium oxide (MgO).

However, there are exceptions, such as certain ionic compounds that have low melting points, such as some ammonium salts, which can exist as solids or even liquids at room temperature.

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Answer:

a. KCl

Explanation:

a. KCl - made of 2 elements

b. NH4Cl

c. KClO3

d. NH4ClO3

Atomic weight of metal : 24

Proust states the Comparative Law that compounds are formed from elements with the same Mass Comparison so that compounds have a fixed composition of elements

Divalent metal oxide=XO

MW O = 16

MW XO₂ =  X+16

\(\tt \%mass=\dfrac{Ar~X}{X+16}\times 100\%\\\\0.6=\dfrac{X}{X+16}\\\\0.6(X+16)=X\\\\0.6X+9.6=X\\\\0.4X=9.6\rightarrow X=24\)

Dalton believed that atom in not visible it is an invisible particle and whole universe is made up of atom only.

Atom is a visible particle consist of proton neutron and electrons and can be seen under the electron microscope only and it is the smallest unit of matter from which everything of the universe made up of.

Dalton says that atom is the particle cannot be seen but all matter is made up of that only which is not true and not even possible because matter is visible to us.

After some time with the help of experiments Rutherford performed bombarding experiment on the gold foil with the help of that he concluded that atom is visible.

Therefore, Dalton believed that atom in not visible it is an invisible particle and whole universe is made up of atom only.

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The percent composition by mass of oxygen in magnesium sulfate (MgSO₄)  is 53.33%.

The percent composition of mass of oxygen in magnesium sulfate can be calculate as follows

we know that Molar mass of magnesium sulfate = 120 g/mol

Magnesium sulfate has four oxygen atoms, so multiply the molar mass of oxygen by four. So 16 × 4 = 64 g/mol.

To calculate the percent oxygen composition,

% oxygen composition = mass molar oxygen / mass molar

% oxygen composition = 64/120 × 100

% oxygen composition = 53.33 %

Therefore, the percent composition by mass of oxygen in magnesium sulfate (MgSO₄)  is 53.33%.

The mass fraction of every element found in a compound is referred to as the percentage composition of the solution.

Three techniques can be used to determine the percentage composition of matter:

The first method is good if both ingredients are solid and can be measured in grams.

A second approach can be used when both components are liquids.

A third approach is used when one substance is solid and the other is liquid. Divide the two quantities and multiply by 100 to calculate the composition ratio. By convention, both quantities must have the same units.

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The number of moles of helium occupying a volume of 5.00 L at 227.0°C and 5.00 atm is approximately 0.609 mol. Hence, the correct option is: c)

How can we calculate the number of moles of helium?

To calculate the number of moles, we can use the ideal gas law equation: PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.

To determine the number of moles, we can use the ideal gas law equation:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.

Given:

P = 5.00 atm

V = 5.00 L

T = 227.0°C = (227.0 + 273) K = 500 K (converting to Kelvin)

Now, we can rearrange the ideal gas law equation to solve for the number of moles:

n = (PV) / (RT)

Substituting the given values into the equation:

n = (5.00 atm * 5.00 L) / (0.0821 atm·L/(mol·K) * 500 K)

Calculating this expression gives the number of moles, which is approximately 0.609 mol.

Therefore, the correct option is c) 0.609 mol.

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Answer:

2.0 x 10²³ atoms Au = 65.4g

1.5 x 10²³ atoms Pb = 51.6g

7.9 x 10²¹ atoms U = 3.1g

Explanation:

We want to convert each to grams.

We can use dimensional analysis to do so.

Kindly view the attached image for work.

1.) 2.0 x 10²³ atoms Au

Needed conversions:

Math: (2.0x10²³atoms)/(6.022x10²³atoms) x 196.966g = 65.4g

2.) 1.5 x 10²³ atoms lead

Needed conversions:

Math: (1.5x10²³atoms)/(6.022x10²³atoms) x 207.2g = 51.6g

3.) 7.9 x 10²¹ atoms U

Needed conversions:

Math: (7.9x10²¹atoms)/(6.022x10²³atoms) x 238.029g = 3.1g

Although the elements' properties are the same for all of them, they are distinct from those of the compound.

A property with several buildings in one location is referred to as a real estate compound. Even while many of them serve as playgrounds for such famous and wealthy, they serve other functions as well.

Chemical characteristics of a compound are distinct from those of the elements its includes. When two or even more atoms get chemically linked, a material called a molecule is created (bonded).

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