The concentration of 1130+ in a solution is found to be 1.75 X 10-8 M 250C. Find [OH].

The smallest angle, measured from the reflecting planes, at which constructive interference of an X-ray beam is observed is approximately 27.2 degrees.

To determine the smallest angle of constructive interference, we can use Bragg's Law, which states that constructive interference occurs when the path difference between two waves is equal to an integer multiple of the wavelength. The formula is given as:

2d sin(θ) = nλ

Where:

d is the distance between the reflecting planes (0.541 nm)

θ is the angle between the incident X-ray beam and the planes (the desired angle)

n is the order of the interference (we are considering the first-order, so n = 1)

λ is the wavelength of the X-ray beam (0.0649 nm)

Rearranging the formula, we get:

sin(θ) = (nλ) / (2d)

θ = arcsin((nλ) / (2d))

Plugging in the values, we have:

θ = arcsin((1 * 0.0649 nm) / (2 * 0.541 nm))

θ ≈ 27.2 degrees

Therefore, the smallest angle at which constructive interference is observed is approximately 27.2 degrees.

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If for a certain chemical reaction, δH°=−35.8kj and δS°=−80.0j/k. Then  the chemical reaction is exothermic.

This is because the sign of δH° is negative, indicating that heat is released during the reaction, and the sign of δS° is also negative, indicating a decrease in entropy. An exothermic reaction releases heat and decreases entropy, while an endothermic reaction absorbs heat and increases entropy.

endothermic reactions absorb energy from the surrounding that is in the form of heat. On the other hand, an exothermic reaction releases energy into the surrounding of the system.

The burning of magnesium ribbon is an example of an exothermic reaction. Photosynthesis is an example for endothermic reaction

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The potassium permanganate is an inorganic compound with the chemical formula KMnO₄. Its IUPAC name is given as potassium manganate (VII). The  substance which forms propanoic acid is but-1-ene. The correct option is A.

The oxidation is defined as the process which involves the addition of oxygen or removal of hydrogen. The reaction of potassium manganate (VII) with an alkene is an oxidation reaction.

The acidified potassium manganate (VII) solution oxidizes the alkene by breaking the 'C'-'C' double bond and replacing it with 'C'-'O' double bonds.

The reaction of but-1-ene in presence of potassium manganate (VII) is:

CH₃CH₂CH = CH₂ → CH₃CH₂COOH + CO₂

Thus the correct option is A.

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Ethanol, a type of grain alcohol that may be combined with gasoline and used in vehicles, is beneficial to the environment because it is a renewable fuel that is produced from biomass.

Additionally, ethanol burns cleaner and more thoroughly than either gasoline or diesel. Carbon dioxide is removed from the atmosphere as the grain or biomass used to produce ethanol takes it in as part of its growth process, making ethanol a cleaner alternative to gasoline.

By using grain-based ethanol instead of gasoline, greenhouse gas emissions can be reduced by 44-52%, as reported by the Argonne National Laboratory of the United States Department of Energy. Similarly, a team of experts from Harvard, MIT, and Tufts found that modern corn ethanol reduces greenhouse gas emissions by 46% compared to gasoline.

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Answer:

422.584 kilojoules.

Explanation:

Easy, just know you stuff and you'll understand.

Answer:

A battery is a device that stores chemical energy and converts it to electrical energy. The chemical reactions in a battery involve the flow of electrons from one material (electrode) to another, through an external circuit. The flow of electrons provides an electric current that can be used to do work.

Explanation:

A subject-based aesthetic refers to the idea that the artistic value of a work is dependent on the subject matter that it depicts. In other words, the more meaningful or important the subject matter, the more valuable the work of art.

This aesthetic is often associated with abstract or conceptual art, where the subject matter is not immediately apparent and requires interpretation. However, this aesthetic can also apply to realistic portrayals of subjects. For example, a painting that depicts a historical event or a significant cultural moment may be seen as having more artistic value than a painting of a simple still life.

The level of detail and accuracy in the depiction of the subject can also be considered when evaluating the artistic value of a realistic work. Overall, the subject-based aesthetic can be applied to both abstract and realistic works of art. It is important to consider the significance and meaning behind the subject matter when evaluating its artistic value.

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Explanation:

Mass percent of silver in silver nitrate = 63.5 g100 g×100%=63.5%

The percent of silver in AgNO₃ is 63.5%.

Percent composition is the percent ratio of mass of the substance to the total mass. It is calculated to be the mass of the substance divided by the molar mass of the substance which is then multiplied by 100%.

In chemistry, yield is a measure of the quantity of moles of a product formed in relation to the reactant consumed, obtained in a chemical reaction, usually expressed as a percentage.

Atomic mass of Ag = 108

Atomic mass of N = 14

Atomic mass of O = 16

Molar mass of AgNO₃ = 108 + 14 + ( 3 × 16 )

= 170 g/mol

Percentage of silver = (mass of silver/total mass) × 100

= 63.5%.

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Answer:

52

Explanation:

So if m= max heart rate, which you know is 125. Then write the equation as. 125=176-0.8A. Now solve for A to get the persons age.

Answer:

Therefore, the equilibrium constant (K) for the given reaction is 23.7.

Explanation:

To calculate the equilibrium constant (K), we need to use the law of mass action. The law of mass action states that the product of the concentrations of the products raised to their stoichiometric coefficients divided by the product of the concentrations of the reactants raised to their stoichiometric coefficients is equal to the equilibrium constant.

The balanced chemical equation is:

4HCl(aq) + O2(g) + 2Cl2(g) + 2H₂O(g) ⇌ 4ClH0.5(aq)

The stoichiometric coefficients indicate that the reaction involves a one-to-one ratio of reactants to products. Therefore, we can write:

K = [ClH0.5]^4 / [HCl]^4 [O2] [Cl2]^2 [H2O]^2

Substituting the given concentrations into the expression, we get:

K = [(0.883/2)^4] / [(0.302)^4 (0.109) (0.883)^2 (0.166)^2]

Simplifying the expression and calculating, we get:

K = 23.7

Therefore, the equilibrium constant (K) for the given reaction is 23.7.

Answer:

The answer is 101.1032

Explanation:

Given what we know, we can confirm that the interest rate necessary to reach $5500 in 7 years with a starting investment of $4000 on a yearly compounded interest, would be 4.7%.

Since the question did not specify any extra data to be taken into account, such as:

and so on, we can assume that all of these values are null. Therefore, if we take $4000 and add 4.7%, and repeat that every time using our new totals, after 7 repetitions we are left with close to $5500, which is our goal.

Therefore, we can confirm that the interest rate necessary to reach $5500 in 7 years with a starting investment of $4000 on a yearly compounded interest, would be 4.7%.

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Answer:

10 m

Explanation:

From the question given above, the following data were obtained:

Velocity (v) = 14 m/s

Acceleration due to gravity (g) = 9.8 m/s²

Height (h) =?

Next, we shall determine the energy. This can be obtained as follow:

Velocity (v) = 14 m/s

Kinetic Energy (KE) =?

KE = ½mv²

KE = ½ × m × 14²

KE = ½ × m × 196

KE = m × 98

Finally, we shall determine the height. This can be obtained as follow:

Kinetic energy (KE) = m × 98

Acceleration due to gravity (g) = 9.8 m/s²

Height (h) =?

Since the object is falling from a particular height,

Potential energy (PE) = kinetic energy (KE)

PE = mgh

KE = m × 98

m × 9.8 × h = m × 98

Divide both side by m × 9.8

h = m × 98 / m × 9.8

h = 10 m

Thus, the bottle was dropped from a height of 10 m

Answer:

NO ONE DOSE :(

Explanation:

Answer:

The term used to express the efficiency of a fuel is calorific value.

Explanation:

It is the amount of energy (heat) produced on burning 1 kg of a fuel completely in air.

Answer:

The term used to express the efficiency of a fuel is calorific value.

Mass of 19.1 ml of ethanol is 15.2418 g

What is density?

The substance's mass per unit of volume is its density (also known as specific mass or volumetric mass density). The Latin letter D can also be used to represent density, however the most common symbol is (the lower case Greek letter rho). Mass divided by volume is the mathematical definition of density.

Temperature and pressure have an impact on a substance's density. For solids and liquids, this variance is often negligible, whereas for gases, it is significantly higher. A loss in volume and subsequent increase in density occur when pressure is applied to an object. With a few exceptions, a substance's density is decreased by expanding its volume as its temperature is raised. In most materials, heating the bottom of a fluid induces convection, or the movement of heat from the bottom to the top, because the heated fluid rises relative to the denser unheated material due to its decreased density.

Given,

density of ethanol(D) = 0.798 g/ml

 volume(v) = 19.1 ml

 Density = mass/ volume

or D= m/v

mass(m) = D* v

           m = 0.798* 19.1= 15.2418 g

Hence, mass of 19.1 ml of ethanol is 15.2418 g.

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Answer:

Electronegativities generally decrease from top to bottom within a group due to the larger atomic size.

Of the main group elements, fluorine has the highest electronegativity (EN= 4.0) and cesium the lowest (EN=0.79).

Explanation:

Sulfur has the largest electronegative element. Therefore, option C is correct.

Electronegativity is a measure of an atom's ability to attract electrons toward itself in a covalent bond, and it generally increases as you move across a period from left to right in the periodic table.

The type of bond that exists between atoms will depend on the electronegativity of the system.

Out of the given elements, S (sulfur) has the largest electronegativity. Sulfur has an electronegativity value of 2.58 on the Pauling scale, while Na (sodium) has an electronegativity value of 0.93, Mg (magnesium) has an electronegativity value of 1.31, and P (phosphorus) has an electronegativity value of 2.19. Therefore, option C is correct.

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An electrolyte must be used when running an electrocardiogram to improve the conductivity of the skin.

An electrocardiogram is a diagnostic tool that records the electrical activity of the heart. An electrolyte solution must be used to improve the conductivity of the skin so that electrical signals can be transmitted efficiently to the ECG machine from the heart. The electrodes placed on the patient's chest wall are used to pick up the electrical signals that travel through the heart and deliver them to the ECG machine.

However, the human skin is a poor conductor of electrical impulses, and therefore an electrolyte solution must be used to help overcome this barrier to signal transmission. This solution helps improve conductivity by removing dead skin cells and improving contact between the skin and electrodes. This solution helps in providing accurate ECG readings.

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The answer would be the prediction for the given experiment of fish.

The question is incomplete and the question is like the fish will die or not.

And anything about the living being we say whether die or not, he/she will or not, or even talking about the weather this all comes under the prediction.

We can only predict the possible terms about the living beings or nature by seeing their present ability or conditions. It all depends on the nature, environment, culture etc.

As a scientist or a chemist , they can easily predict the outcomes of the several experiments.

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Answer:

10

Explanation:

Atomic number = No. of protons

Therefore, the number of protons of an element with an atomic number of 10, is also 10.

The mammoth was alive and exchanging carbon-14 with the environment approximately 11,460 years ago.

The half-life of carbon-14 is 5730 years, which means that after 5730 years, half of the initial amount of carbon-14 present in a sample will have decayed. Using this information, we can calculate the age of the mammoth as follows:

Let's assume that the original amount of carbon-14 in a living mammoth is x. According to the problem, the mammoth currently has 25% of that amount, or 0.25x.

Since the half-life of carbon-14 is 5730 years, we know that after one half-life, the amount of carbon-14 will have decayed to 0.5x. After two half-lives, it will have decayed to 0.25x, which is the amount present in the mammoth.

Therefore, we can conclude that the mammoth died and stopped exchanging carbon-14 with the environment two half-lives ago. That is, 2 x 5730 = 11,460 years ago.

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If the ion of a new element has 200 electrons, the atomic number of this new element would be 200. However, since there is no such element that is discovered yet, this element remains hypothetical.

If the ion of a new element has 200 electrons, The atomic number of the new element will be equivalent to the number of protons that are present in the nucleus of an atom of the new element. It is because the atomic number represents the number of protons present in an element.A chemist has discovered a "new" element that has similar properties to Nitrogen. If the ion of this new element has 200 electrons, then the atomic number of this new element would be 200 since the number of electrons in an ion of an element is equivalent to the number of protons minus the charge on the ion.The new element is still in the hypothetical stage since it has not been observed in the physical world. Nitrogen, on the other hand, is a chemical element with the atomic number 7 and symbol N. It is the seventh-most abundant element in the universe, constituting roughly 78% of the earth's atmosphere. Nitrogen is a non-metal, and it is part of the nitrogen group of elements that also includes phosphorus, arsenic, antimony, and bismuth.In conclusion, if the ion of a new element has 200 electrons, the atomic number of this new element would be 200. However, since there is no such element that is discovered yet, this element remains hypothetical.

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Based on the information we can infer that substance z is an example of an element, substances x and t are examples of compounds, and substance y is an example of a mixture.

To identify the classification of each substance we must take into account the image. In the image we see atoms of each element that are distinguished by different colors. In the case of red and blue atoms, they are examples of compounds because they are two different elements.

On the other hand, atoms of the same color form particles of a specific element. From the above we can infer that substance z is an example of an element, substances x and t are examples of compounds, and substance y is an example of a mixture.

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Approximately 1.05525 grams of magnesium are present in a 50.25-gram sample of Earth's crust, based on the given percentage composition.

To calculate the mass of magnesium in a sample of Earth's crust, we can use the given percentage and the mass of the sample.

Magnesium makes up 2.1% of Earth's crust, we can calculate the mass of magnesium using the formula:
Mass of magnesium = Percentage of magnesium × Mass of Earth's crust

In this case, the mass of Earth's crust is given as 50.25 g.

So, we can substitute the values into the formula:
Mass of magnesium = 2.1% × 50.25 g

To calculate the answer, we need to convert the percentage to decimal form:
2.1% = 2.1/100 = 0.021

Now, we can calculate the mass of magnesium:
Mass of magnesium = 0.021 × 50.25 g
Mass of magnesium = 1.05525 g

Therefore, there are approximately 1.05525 grams of magnesium present in a sample of Earth's crust with a mass of 50.25 g.

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The radii of the first, second, and third Bohr orbits of hydrogen are 0.529 Å, 2.12 Å, and 4.77 Å respectively. The equation is as follows:

r = n^2 * (0.529 Å) / Z.

In this equation, r represents the radius of the orbit, n represents the principal quantum number (which corresponds to the energy level of the orbit), 0.529.

Å is a constant representing the Bohr radius, and Z is the atomic number of the nucleus (which is 1 for hydrogen).
To calculate the radii of the first, second, and third Bohr orbits of hydrogen, we can substitute the values of n into the equation.

For the first orbit (n = 1): r = 1^2 * (0.529 Å) / 1 r = 0.529 Å
For the second orbit (n = 2): r = 2^2 * (0.529 Å) / 1 r = 2.12 Å
For the third orbit (n = 3): r = 3^2 * (0.529 Å) / 1 r = 4.77 Å

Therefore, the radii of the first, second, and third Bohr orbits of hydrogen are 0.529 Å, 2.12 Å, and 4.77 Å respectively.

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The enthalpy of the reaction is 14 J/mol.

The enthalpy of a reaction (ΔH) is the amount of energy transferred between a system and its surroundings during a chemical reaction at constant pressure, measured in joules per mole (J/mol). This value is important because it can tell us whether a reaction is exothermic or endothermic, as well as give us information about the strength of chemical bonds within the reactants and products.To calculate the enthalpy of a reaction, we need to know the amount of energy released or absorbed (Q) and the number of moles of the compound involved in the reaction (n). We can use the equation:
ΔH = Q/n
Given that 6 moles of a compound produce 84 J of energy, we can calculate the enthalpy of the reaction as follows:
ΔH = Q/n
ΔH = 84 J / 6 mol
ΔH = 14 J/mol
This means that for every mole of the compound involved in the reaction, 14 J of energy is transferred between the system and the surroundings. Since the value is positive, we can conclude that the reaction is endothermic, meaning that it requires an input of energy to occur.It is worth noting that the enthalpy of a reaction can depend on a number of factors, such as temperature, pressure, and the specific conditions under which the reaction occurs. As such, it is important to take these factors into account when calculating or predicting enthalpy values.

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Explanation:

When the electron changes levels, it decreases energy and the atom emits photons. The photon is emitted with the electron moving from a higher energy level to a lower energy level. The energy of the photon is the exact energy that is lost by the electron moving to its lower energy level.

1. The equation is not balanced. The balanced equation is \(4NH_3 + 5O_2 --- > 4NO +6 H_2O\)

2. The equation is balanced.

3. The equation is not balanced. The balanced version is \(2H_2O --- > 2H_2 + O_2\)

A balanced chemical equation usually has the same number of atoms of different elements in the reactants and the products, even though the forms of the atoms might have changed.

Consider the first equation: \(NH_3 + O_2 --- > NO + H_2O\)

The number of hydrogen atoms is not balanced. Thus, the equation that shows balanced atoms of different elements would be: \(4NH_3 + 5O_2 --- > 4NO +6 H_2O\)

Consider the second equation: \(N_2 + 3H_2 -- > 2NH_3\)

There are 2 atoms of nitrogen in the reactants and there are also 2 in the product. The number of hydrogen atoms is 6 in the reactants and 6 in the products. Thus, it is a balanced equation.

Consider the third equation: \(2H_2O --- > H_2 + O_2\)

There are 4 hydrogen atoms in the reactant and only 2 in the products. The balanced equation would be: \(2H_2O --- > 2H_2 + O_2\)

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