A busen burner flame is sooty black and mixed with an organige- yellow color. which is the probable reason for this condition?

Answer:

Transform boundaries because they're sliding past each other.

I hope this helped!

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\(n = \frac{N}{L} \\\)

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

we have

\(n = \frac{1.88 \times {10}^{25} }{6.02 \times {10}^{23} } \\ = 31.229235...\)

We have the final answer as

Hope this helps you

Answer:

The correct option is;

a. 255.0 g

Explanation:

The given information are;

Mass of propane, C₃H₈ in the combustion reaction = 156.06 g

The equation of the combustion reaction is C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

From the balanced chemical equation of the reaction, we have;

One mole of propane, C₃H₈ reacts with five moles oxygen gas, O₂, to form three moles of carbon dioxide, CO₂, and  four moles of water, H₂O

The molar mass of propane gas = 44.1 g/mol

The number of moles, n, of propane gas = Mass of propane gas/(Molar mass of propane gas) = 156.06/44.1 = 3.54 moles

Given that one mole of propane gas produces 4 moles of water molecule (steam) H₂O, 3.54 moles of propane gas will produce 4×3.54 = 14.16 moles of  (steam) H₂O

The mass of one mole of H₂O = 18.01528 g/mol

The mass of 14.16 moles of H₂O = 14.16 × 18.01528 = 255.0 g

The mass of H₂O produced = 255.0 g

Answer:

Chemical Change

Explanation:

The explosion of fireworks is an example of chemical change. During a chemical change, substances are changed into different substances. In another words, the composition of the substance changes.

Answer:

The least electronegative atom is (B) Rb, which is rubidium

Explanation:

Electronegativity is a measure of an atom's ability to attract electrons towards itself when it forms a chemical bond. The electronegativity of an atom depends on several factors such as the number of protons in the nucleus, the distance between the nucleus and the valence electrons, and the shielding effect of inner electrons.

Rubidium has the lowest electronegativity of the four options because it has a larger atomic radius and a lower effective nuclear charge than the other atoms. The larger atomic radius of rubidium means that the valence electrons are farther away from the nucleus and are therefore less strongly attracted to it. Additionally, the lower effective nuclear charge of rubidium (i.e., the net positive charge experienced by valence electrons) makes it less attractive to incoming electrons.

In contrast, option C, F (Fluorine) has the highest electronegativity of all elements because it has a smaller atomic radius and a higher effective nuclear charge due to its high atomic number and number of protons in the nucleus. Calcium (option D) has a higher electronegativity than rubidium because it has a smaller atomic radius and a higher effective nuclear charge than rubidium. Silicon (option A) has a moderately high electronegativity due to its intermediate atomic radius and effective nuclear charge.

Answer:

the dividend yield is 4%

Explanation:

The computation of the dividend yield is as follows:

Dividend yield = Dividend per share ÷ current share price per share

= ($0.20 × 4 quarters) ÷ $20

= $0.80 ÷ $0.20

= 4%

hence, the dividend yield is 4%

The same is determined by applying the above formula

To make approximately a liter of pH 3.55 buffer, you would use 8.6 mL of 0.10 M HCOOH and 13.7 mL of 0.10 M HCOONa. We would use x mL of 0.10 M HCOOH and 0.4x mL of 0.10 M HCOONA to make approximately a liter of pH 3.55 buffer.

To prepare a pH 3.55 buffer using the available 0.10 M solutions of HCOOH (formic acid) and HCOONa (sodium formate), you can use the Henderson-Hasselbalch equation:
pH = pKa + log([A-]/[HA])
For formic acid (HCOOH), the pKa is approximately 3.75. We can rearrange the equation to find the ratio of [A-]/[HA]:
3.55 = 3.75 + log([HCOONa]/[HCOOH])
log([HCOONa]/[HCOOH]) = -0.20
[HCOONa]/[HCOOH] = 10^(-0.20) ≈ 0.63
Now, to make approximately a liter of buffer with a 0.10 M concentration, we can use the following:
0.10 L * (x + y) = 1 L
Since the ratio of [HCOONa]/[HCOOH] is 0.63, we can write:
x = 0.63y
Substitute x in the first equation:
0.10 L * (0.63y + y) = 1 L
0.73y = 10 L
y ≈ 13.7 L
Then, x ≈ 0.63 * 13.7 L ≈ 8.6 L

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Answer:

salad

Explanation:

Answer:

D

Explanation:

C/ If Fe is greater than Fg, the negatively charged oil droplet will move freely toward the negatively charged plate.

In the Millikan oil droplet experiment, the negatively charged oil droplets are subjected to an electric field created by the charged plates. The electric force (Fe) acts on the oil droplet in a direction opposite to the gravitational force (Fg). When Fe is greater than Fg, the electric force overcomes the gravitational force, causing the negatively charged oil droplet to experience an upward force. As a result, the oil droplet moves freely upward toward the negatively charged plate.

Option B is incorrect because if Fe is equal to Fg, the forces balance each other, resulting in a stationary droplet. However, the question states that Fe is increased until it is greater than Fg, implying that the droplet is no longer stationary but moves in response to the electric force.

Therefore, option C is the correct answer, as it describes the effect of an electric field on the motion of a negatively charged oil droplet in the Millikan oil droplet experiment.

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Answer:

B if i'm not mistaken.

Explanation:

The smallest frequency photon corresponds to the smallest energy difference between the initial and final states. This energy difference is given by the formula E = hc/λ, where h is Planck's constant, c is the speed of light, and λ is the wavelength of the photon. Since frequency is inversely proportional to wavelength (ν = c/λ), the smallest frequency photon corresponds to the longest wavelength photon, which has the smallest energy.

Using the formula for the energy levels of hydrogen (E = -13.6 eV/n^2), we can calculate the energy differences for each transition:
A. n = 5 to n = 6: ΔE = (-13.6 eV/6^2) - (-13.6 eV/5^2) = 0.377 eV
B. n = 1 to n = 3: ΔE = (-13.6 eV/3^2) - (-13.6 eV/1^2) = 10.2 eV
C. n = 5 to n = 4: ΔE = (-13.6 eV/4^2) - (-13.6 eV/5^2) = 0.194 eV
D. n = 1 to n = 2: ΔE = (-13.6 eV/2^2) - (-13.6 eV/1^2) = 3.4 eV
E. n = 4 to n = 1: ΔE = (-13.6 eV/1^2) - (-13.6 eV/4^2) = 10.2 eV

From these calculations, we can see that the transition with the smallest energy difference (and hence the smallest frequency photon) is C. n = 5 to n = 4.

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Answer:

The virus's genome is uncoated from the protein and injected into the host cell.

Explanation:

To determine the number of valence electrons remaining in nonbonding pairs in a molecule, we need to know the Lewis structure or the molecular formula of the molecule in question.

Valence electrons are the electrons in the outermost shell (or valence shell) of an atom that participate in chemical bonding. The number of valence electrons in an atom can be determined by its position in the periodic table. In general, for the main group elements (1A-8A), the number of valence electrons is equal to the group number. For example, elements in Group 1A (such as hydrogen, lithium, and sodium) have 1 valence electron, while elements in Group 8A (such as helium, neon, and argon) have 8 valence electrons. Transition metals, which are located in the middle of the periodic table, have valence electrons in multiple energy levels and do not follow this pattern.

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The equilibrium constant for a reaction conducted at 25°C can be calculated using the equation ΔG° = -RTlnK, where R is the gas constant (8.314 J/molK), T is the temperature in Kelvin (25°C + 273 = 298K), ln is the natural logarithm, and K is the equilibrium constant. Therefore, we can rearrange this equation to solve for K: K = e^(-ΔG°/RT).

Substituting the given values, we get K = e^(-3050 J/mol / (8.314 J/molK x 298K)) = e^(-1.25) = 0.29.

So the equilibrium constant for the reaction conducted at 25°C is 0.29. This value indicates that the reactants are favored at equilibrium, as K < 1. In other words, the reaction proceeds more towards the reactants than the products at this temperature. If the equilibrium constant was greater than 1, it would indicate that the products are favored at equilibrium, and the reaction proceeds more towards the products than the reactants. The value of the equilibrium constant is dependent on the temperature, and changes in temperature can lead to changes in the value of K.

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the pH of sulfuric acid (H₂SO₄) with a hydrogen ion concentration of 1x10^(-3) M is 3.

To determine the pH of sulfuric acid (H₂SO₄) with a hydrogen ion concentration of 1x10^(-3) M, we can use the pH formula:

pH = -log[H+]

In this case, the hydrogen ion concentration is 1x10^(-3) M. Substituting this value into the formula:

pH = -log(1x10^(-3))

Using a scientific calculator, we can calculate the logarithm of 1x10^(-3) as:

log(1x10^(-3)) = -3

Now, we can find the pH by taking the negative logarithm:

pH = -(-3) = 3

Therefore, the pH of sulfuric acid (H₂SO₄) with a hydrogen ion concentration of 1x10^(-3) M is 3.

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The new rate of the modified reaction will be 44mmmM/s which can be calculated by the rate of disappearance.

For this response, the rate of disappearance was calculated. The concentration will drop as it is consumed. After 54 minutes, the concentration dropped to 1.58 molar.

What is the reaction's speed?

Units are a way to express the reaction rate. HCl is characterized by a change in polarity of the compound per unit of time or per change in time. We have 1.85 Molar moving to 1.58 Molar in 54 minutes. Ten times as much negative three molar HCl would be produced each minute. People should subtract the initial polarity from the end one to do it correctly.

Because of the drug's concentration, we experience a negative rate of reaction. The fact that the rate is negative indicates that we are consuming.

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The observation that shows a change in state of matter has occurred is option A) Wood burns, producing gas and an ashy residue.

A change in state of matter refers to the transformation of a substance from one physical state to another, such as from solid to liquid, liquid to gas, or vice versa. In option A, when wood burns, it undergoes a chemical reaction known as combustion.

During combustion, the wood reacts with oxygen in the air and undergoes a transformation from a solid state to a gaseous state, producing gas (such as carbon dioxide and water vapor) as well as an ashy residue (solid carbon and other impurities remaining after the combustion process). This change in state is accompanied by the release of heat and light.

Option B, where dew forms on the grass overnight, does not indicate a change in state of matter. Dew formation is a physical process known as condensation, where water vapor in the air cools down and changes into liquid water droplets upon contact with a colder surface (such as grass). In this case, the state of matter remains the same (from a gaseous state to a liquid state), and no new substances are formed.

Option C, where an alkali indicator changes color when added to a cleaner, also does not represent a change in state of matter. It suggests a chemical reaction between the alkali indicator and the cleaner, resulting in a color change. However, the states of matter involved (liquid or solid) do not change during this process.

In summary, option A is the observation that indicates a change in state of matter, as it involves the transformation of wood from a solid state to a gaseous state during combustion.

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The ideal gas law, which relates the pressure, volume, temperature, and number of moles of an ideal gas, can be applied to real-world situations. By considering a specific scenario and applying the ideal gas law, we can analyze the behavior of gases and make predictions about their properties.

Let's consider a situation where a scuba diver is exploring underwater at a depth of 30 meters. We can apply the ideal gas law, specifically the form known as Boyle's law, which states that the pressure and volume of a gas are inversely proportional at constant temperature.

Question: How does the pressure of the gas in the scuba tank change as the diver descends to a depth of 30 meters, assuming the temperature remains constant?

To answer this question, 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 of gas, R is the ideal gas constant, and T is the temperature. By keeping the temperature constant, we can observe the relationship between pressure and volume as the diver descends and calculate the change in pressure based on the change in volume.

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The balanced chemical reaction is :

\(O_2 + 4Na \ -> \ 2Na_2O\)

Number of moles of Na, \(n = \dfrac{14.6}{23} = 0.635 \ mol\) .

Now, from balance chemical reaction we can see that 1 mole of oxygen reacts with 4 moles of sodium.

So, number of moles of oxygen are :

\(n = \dfrac{0.635}{4}\ mole\)

So, amount of oxygen required is :

\(m = \dfrac{0.635 \times 32}{4}\ gm\\\\m = 5.08 \ gm\)

Therefore, 5.08 gram of oxygen will react with 14.6 gram of sodium.

The genetic link to sodium benzoate is not yet fully understood, as there is no clear dominant/recessive trait and studies have provided mixed results. Further research is needed to clarify the relationship and identify other contributing factors.

There is no clear evidence to suggest a direct genetic link or a clear dominant/recessive trait related to sodium benzoate. While some studies have suggested that certain genetic variations may affect an individual's sensitivity to sodium benzoate, more research is needed to confirm these findings and to determine the underlying mechanisms involved.

Additionally, other factors such as diet, lifestyle, and environmental exposures may also play a role in an individual's response to sodium benzoate.

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Answer: the last one:)

Explanation: energy cannot be destroyed but can be transfered

(called energy transfer).

Here's link to the answer:

tinyurl.com/wpazsebu

Answer:

The elements on the left-side of the periodic table are relatively electron deficient. So due to their comparatively low effective nuclear charges (the net positive charge of the protons minus the shielding core electrons below the valence level), their electrostatic hold on these electrons are weak.

Elements further right on the period table though,  have higher effective nuclear charges and stabilize electrons more effectively. Which leads to localized covalent bonding and the formation of molecules.

The right side contains non metals while the left side contains metals.

Metals lose electrons (negative electrons). They now have more protons,  therefore making the ion positive.

Non metals gain electrons (positive electrons). So the ion has more electrons than protons which makes the ion negative.

Answer:

an acid +metal =salt +hydrogen

Explanation:

HCL+Mg =Mgcl2+H2

(because Mg has an ion with a +2 charge ,it attracts Cl with a -2 charge )

therefore the correct answer is D for the above reasons

Answer:

When magnesium reacts with hydrochloric acid (HCl), a single-replacement reaction occurs. These reactions involve the substitution of one element in a compound with another. In this case, the hydrogen in HCl will be swapped with the magnesium metal because both of these elements make cations (positively-charged ions) when they participate in ionic bonding.

So why does the chorine have a subscript of 2 when it bonds with magnesium? This occurs in order to balance the ionic charges and make the overall compound neutral.

Magnesium wants to give away 2 electrons when it ionizes, forming the cation Mg²⁺. However, chlorine only wants to gain 1 electron to fill its valence shell, making it form the anion, Cl⁻. As you can see, if just one of each ion were to bond, the compound would have an overall charge of +1 because (+2 - 1 = +1). Therefore, the compound can be made neutral if two chlorine ions bond with just 1 magnesium ion (+2 - 1 - 1 = 0).

The hydrogen ion from HCl becomes H₂ after the reaction occurs. This occurs because hydrogen generally exists as a diatomic compound in nature (diatomic = exists as 2 atoms).

The complete balanced equation for the reaction is:

Mg + 2 HCl  ------> MgCl₂ + H₂

The glassware and equipment needed for this procedure include a burette to dispense the NaOH solution, a pipette to measure the beverage, a conical flask to hold the beverage, and an indicator to detect the endpoint of the titration

Titrating a beverage to determine the concentration of a weak acid requires several steps and specific materials. Here is a step-by-step procedure:

1. First, prepare the standard solution of a strong base, such as NaOH, by accurately weighing the desired amount and dissolving it in distilled water.

2. Use a pipette to measure a precise volume of the beverage into a clean conical flask.

3. Add 2-3 drops of a suitable indicator to the beverage, such as phenolphthalein, which changes color when the pH reaches 8.2-10.

4. Slowly add the standardized NaOH solution to the beverage with continuous swirling until the indicator changes color.

5. Record the volume of the NaOH solution added, which will be equal to the volume of weak acid in the beverage.

6. Repeat the titration 2-3 times to obtain accurate results.

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Explanation:

I hope it helps

ya welcome

Answer:

No

Explanation:

No. The demonstration does not violate the conservation of mass.

The law of conservation of mass states that mass can neither be created nor destroyed in a reaction. However, mass can be converted from one form to another during the reaction.

In this case, even though the remaining bits of paper weigh 0.5 g while the original paper weighed 2.5 g, the ashes and smoke/gas from the burning will all add up to the lost weight of the paper.

The burned part has been converted into other forms. If the smoke/gas and the ashes are properly captured, they will mark up with the weight of the remaining paper to give the weight of the original paper.

The answer to the question on whether the burning violates the law of conservation of mass, we say that;

No, the demonstration does not violate the conservation of mass because the mass formed still adds up to the original mass.

The law of conservation of mass states that mass in an isolated system, matter can neither be created nor destroyed by chemical reactions or physical transformations. However, it could involve change in mass from one form to another.  

Now, we are told that the remaining bits of paper has a mass of 0.5 g while the original paper has a mass 2.5 g. The reason why the mass left is 0.5 kg is because the ashes and smoke from the burning will add up to give the original weight of the paper.

Thus, since when the ashes, and smoke add up to still give the original mass of 3.5 g, it means that the mass is neither created nor destroyed

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The solubility product (Ksp) of a substance is a measure of the maximum solubility of that substance in a given solution. It is calculated as the product of the molar concentrations of the ions present in the solution.

In the case of lead(II) iodide, the Ksp can be calculated as the product of the molar concentrations of Pb2+ and I− ions present in the solution.

At the given temperature, the solubility of lead(II) iodide is 0.064 /100 ml. Therefore, the molar concentrations of Pb2+ and I− ions in the solution would be 0.064/100 ml divided by the molar mass of lead(II) iodide (364/mol). This gives a Ksp of 4.07 x 10-9, which can be rounded to 4.1 x 10-9. This is the solubility product of lead(II) iodide at the given temperature.

In summary, the solubility product of lead(II) iodide at a certain temperature is 4.1 x 10-9 when rounded to two significant figures.

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