you predict that you should make 8.41 x 1024 molecules of ammonia in your reaction. how many grams of ammonia will you make if your prediction is correct?

The question requires us to choose the best option to explain why bubbles rise faster from a warm can of soda than a cold can, based on the solubility of gases in liquids.

Adding heat to a solution composed of a liquid and a gas (i.e., increasing its temperature) provides thermal energy to the gas that makes it possible to overcome the forces that maintain molecules of solvent (liquid) and solute (gas) together. In this way, the molecules of solvent and solute tend to separate, therefore decreasing the solubility of the gas. Based on this, we can say that the solubility of gases in liquids increase with increasing temperature.

Therefore, the best option to answer the question is the first one, "gases become less soluble in liquids at higher temperatures".

Answer:

The bubbling and rapid dissolution of the white powder when treated with diluted HCl acid suggests that the powder is a carbonate. Among the options provided, only (a) Na2CO3 and (e) CaCO3 are carbonates.

To determine which of the two it is, we can look at the results of the flame test. The brick red color of the flame indicates the presence of sodium ions in the solution, which suggests that the white powder is (a) Na2CO3, since it is the only compound in the options given that contains sodium.

Therefore, the answer is (a) Na2CO3.

Explanation:

The white powder that dissolves quickly in diluted HCl acid and produces intensive bubbling is most likely a carbonate compound. The options provided are Na2CO3, BaCO3, and CaCO3. These three carbonates are all known to react with HCl acid, producing carbon dioxide gas, water, and the corresponding metal chloride salt. The reaction can be represented as:

MCO3 + 2HCl → CO2 + H2O + 2MCl

The reaction between Na2CO3 and HCl is particularly vigorous, producing a large amount of carbon dioxide gas, which leads to the intensive bubbling. The other carbonates, including BaCO3 and CaCO3, react more slowly, producing fewer bubbles.

The flame test of the resultant solution, where the flame turns brick red in color, indicates the presence of sodium ions. Sodium ions are known to produce a brick red flame color when exposed to heat. Therefore, the correct answer to this question is option (a) Na2CO3.

In summary, the white powder treated with diluted HCl acid that dissolves quickly and produces intensive bubbling is most likely a carbonate compound. The flame test of the resultant solution, where the flame turns brick red in color, indicates the presence of sodium ions. The correct answer to this question is Na2CO3.

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Answer:

0.12 dm^3 x (1 mol/24 dm^3) = ? mols N2

mols Cu = ? mols N2 x (3 mols Cu/1 mol N2) = ?

Then g Cu = mols Cu x atomic mass Cu = ?

The mass of AI needed to react with 72 g of HCI is 54 g.

To determine the mass of AI needed to react with 72 g of HCI, we can use the stoichiometry of the balanced chemical equation you provided:

2AI + 6HCI --> 2AICI3 + 3H

From the equation, we can see that 2 moles of AI react with 6 moles of HCI to produce 2 moles of AICI3.

This means that the mole ratio between AI and HCI is 2:6 or 1:3.

Given the molar mass of HCI is 36 g/mol, we can calculate the number of moles of HCI in 72 g of HCI by dividing 72 g by the molar mass of HCI:

Number of moles of HCI = mass of HCI / molar mass of HCI

Number of moles of HCI = 72 g / 36 g/mol

Number of moles of HCI = 2 moles

Since the mole ratio between AI and HCI is 1:3, the number of moles of AI needed to react with 2 moles of HCI is also 2 moles.

Now, we can use the molar mass of AI, which is 27 g/mol, to calculate the mass of AI needed to react with 2 moles of HCI:

Mass of AI = number of moles of AI × molar mass of AI

Mass of AI = 2 moles × 27 g/mol

Mass of AI = 54 g

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Answer:

due to the law of conservation of mass, the mass would stay the same.

The correct statements about the energy levels of electrons in shells are the following:

They are the energy charge that an electron possesses, where in each period (in each shell) only a certain number of electrons fit.

Therefore, we can conclude that the electrons of an atom have different energy levels, so they are classified by the energy level in which each of them is located.

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Answer:

I would recycle, reuse, and reduce the litter on this already hurt Earth.

Explanation:

Answer:

I can go out and help pick up garbage and i can recycle and not litter and i can reuse all the plastic water bottles i drink.

Explanation:

Im glad you care about mother earth to

(a) The natural sources of alkanoates includes fats and oils.

Alkanoates are organic compounds which are formed from the reaction which occurs between an alkanoic acid and alkanol.

So therefore, we can now confirm that one of the sources of esters are fatty oils.

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Carbon₁₄ is the radioactive isotope, while carbon₁₂ is stable and non-radioactive.

Carbon₁₄ and Carbon₁₂(C-12) are isotopes of carbon, with C₁₄ having 2 more neutrons than C₁₂. C₁₄ is a radioactive isotope, which means that its nucleus is unstable and undergoes decay over time, emitting radiation in the form of particles and energy. C₁₂, on the other hand, is stable and does not undergo decay.

Overall, the differences between C₁₄ and C₁₂ make them useful for different applications. C₁₄ is used in radiocarbon dating, while C₁₄ is used in many other fields, such as isotope labeling in chemistry and stable isotope analysis in environmental science.

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The statement that is true about making quick turns when your car is equipped with ABS (Anti-lock Braking System) is: "You can turn while you are braking without skidding."

ABS is a safety feature in cars that helps prevent the wheels from locking up during braking, allowing the driver to maintain steering control. When making quick turns with ABS, it is possible to steer the vehicle while applying the brakes without the wheels skidding. This is because ABS modulates the brake pressure on each wheel independently, preventing them from fully locking up and allowing for steering control even under heavy braking.

The other statements mentioned in the options are not true or are unsafe. It is not advisable to turn into oncoming traffic, turning the wheels in the opposite direction is counterproductive, and it is essential to steer while braking to maintain control of the vehicle.

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pH after adding 10.0 ml of acid = 9.81, pH after adding 20.0 ml of acid = 5.31.pH after adding 30.0 ml of acid = 1.20

In chemistry, the pH scale is used to define the acidity or alkalinity of an aqueous solution. Historically, pH stood for "hydrogen potential". The pH values ​​of acidic solutions are usually lower than those of basic or alkaline solutions.

An acid (acid catalysis) is any substance that tastes unpleasant in aqueous solution, turns blue litmus paper red, reacts with some metals to release hydrogen, combines with bases to form salts, and stimulates chemical processes. A Brnsted-Lowry acid or Lewis acid is a molecule or ion that has the ability to donate a proton or form a covalent bond with an electron pair. Proton donors, also known as Brnsted-Lowry acids, are the first class of acids.

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The balanced  chemical equation for the reaction that takes place when a solution of sodium sulfate is mixed with strontium chloride is

Na2SO4 + SrCl2 → 2Nacl + SrSO4

Balanced chemical equation is a chemical reaction in which the number of atoms and moles of the reactant side is the same as the product. This means the reactant side has equal number of atoms and moles with the product.

The balanced equation for the reaction that takes place when a solution of sodium sulfate is mixed with strontium chloride is

Na2SO4 + SrCl2 → 2Nacl + SrSO4

In this reaction, sodium sulfate with strontium chloride to form sodium chloride and strontium sulfate. The coefficients in the balanced equation indicate the stoichiometric ratios of the reactants and the products, ensuring that the same number of atoms of each element is present on both sides of the equation.

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Answer:

B...

Explanation:

Answer:

Below is the clarification of that same particular question.

Explanation:

For that kind of weak diprotic predictor, the standard economic statement can indeed be published as:

    ⇒  \(H_2In_(aq)\rightleftharpoons In^{2-} +2H^+\)

The 85th percentile of blood pressure readings is approximately 137.64. a. To calculate the z-score for a blood pressure reading of 140, we can use the formula:

z = (x - μ) / σ

where x is the value (140 in this case), μ is the mean (121), and σ is the standard deviation (16).

Substituting the values into the formula:

z = (140 - 121) / 16

z ≈ 1.19 (rounded to two decimal places)

b. To find the proportion of Canadians with high blood pressure, we need to calculate the area under the normal distribution curve for values above 140. This can be done by finding the cumulative probability using the z-score.

Using a standard normal distribution table or a calculator, we can find that the cumulative probability corresponding to a z-score of 1.19 is approximately 0.881.

Therefore, the proportion of Canadians with high blood pressure is approximately 0.881 (rounded to four decimal places).

c. To find the proportion of Canadians with systolic blood pressure in the range from 100 to 140, we need to calculate the area under the normal distribution curve between these two values.

Using the z-scores corresponding to 100 and 140, we can find the cumulative probabilities for each value. The cumulative probability for a z-score of -1.25 (corresponding to 100) is approximately 0.105, and the cumulative probability for a z-score of 1.19 (corresponding to 140) is approximately 0.881 (as calculated in part b).

The proportion with systolic blood pressure between 100 and 140 is the difference between these two probabilities:

Proportion = 0.881 - 0.105 ≈ 0.776 (rounded to four decimal places)

d. The 85th percentile represents the value below which 85% of the blood pressure readings fall. To find the 85th percentile, we need to determine the z-score that corresponds to an area of 0.85 under the normal distribution curve.

Using a standard normal distribution table or a calculator, we can find that the z-score corresponding to an area of 0.85 is approximately 1.04.

To find the actual blood pressure reading at the 85th percentile, we can use the z-score formula:

x = μ + (z * σ)

Substituting the values:

x = 121 + (1.04 * 16)

x ≈ 137.64

Therefore, the 85th percentile of blood pressure readings is approximately 137.64.

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Answer:

The Isotope of sulfur.  

32S 94.99% stable.

33S 0.75%   Stable.

Explanation:

Yes, not allowing reactants in a   to have enough time to fully react can count as human error in a lab. In chemistry, reaction time is an essential factor in determining the completeness and efficiency of a chemical reaction.

If the reactants are not given sufficient time to react, the reaction may be incomplete, leading to inaccurate or inconsistent results. This can happen due to human error, such as not monitoring the reaction time or not following the reaction protocol correctly.

Therefore, ensuring proper reaction time is crucial to obtain reliable and accurate results in a lab.

A tin (Sn) atom has four valence electrons. Valence electrons refer to the electrons located in the outermost shell or energy level of an atom.

In tin, it has an electronic configuration of [Kr] 5s2 4d10 5p2 where [Kr] represents the 36 innermost electrons from the noble gas krypton (Kr).This arrangement has two electrons in the 5s sublevel, ten electrons in the 4d sublevel, and two electrons in the 5p sublevel. The highest energy level or outermost shell is the fifth shell, which contains the two 5s electrons and two 5p electrons.

Therefore, a tin atom has a total of four valence electrons.The number of valence electrons determines how an atom will react or bond with other atoms. Tin is a metal and, like most metals, tends to lose electrons to form positive ions. In particular, tin can lose its four valence electrons to form a Sn4+ ion.

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Answer:

False

Explanation:

Chemical reaction equation:

                   C₅H₁₂ + 8O₂ → 2CO₂ + 6H₂O

Most chemical reactions obey the law of conservation of mass. By so doing, the number of chemical elements on both sides of the expression must be balanced.

                 Reactants                                          Products

C                    5                                                           4

H                  12                                                           12

O                 16                                                             10

We see that for C and O, the number of atoms on both sides of the expression differs and so, it is not balanced.

A cell membrane is more flexible than a brick wall. Why might many cells benefit from a flexible cell membrane because it allows them to survive in and out of the cell.

The cell is surrounded by a membrane called as cell membrane . cell membrane is a semipermeable membrane. semipermeable membrane is the type of membrane which allows solvent particles to pass through it . or some molecules or ion . Therefore , many cells benefited by cell membrane as they can pass through it.

Thus, A cell membrane is more flexible than a brick wall. Why might many cells benefit from a flexible cell membrane because it allows them to survive in and out of the cell.

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Molecules of H₂0 and 0₂ have stopped forming is  statement is true at this point in the reaction.

Option D is correct

Products are the byproducts of a chemical reaction—new substances created. For instance: When two sodium atoms and two chlorine atoms react, they produce sodium chloride, a totally new molecule (two atoms).

Chemical reactions are started by reactants, or substances. Products are the chemical species that remain after the reaction has been fully finished.

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There are several chemicals that do not induce vasodilation and permeability at an infection site.

One example is corticosteroids, which have anti-inflammatory properties and can reduce swelling and inflammation without causing vasodilation or increased permeability. Other examples include nonsteroidal anti-inflammatory drugs (NSAIDs) and certain antibiotics. However, it is important to note that the effectiveness of these chemicals may vary depending on the specific infection and individual response.

Vasoconstrictors, such as epinephrine and norepinephrine, narrow blood vessels, while anti-inflammatory agents, like corticosteroids, reduce inflammation and decrease permeability. These chemicals work in contrast to those that promote vasodilation and increased permeability, such as histamine and bradykinin, which contribute to the inflammatory response.

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Answer:

classification of mixture​s will be:  solutions, suspensions, and colloids

Hopefully this helped

Covalent bonding can be defined as the sharing of electrons between two atoms.

The statement which best explains the difference between polar and nonpolar covalent bonds is "Polar covalent bonds share electrons unequally, while nonpolar covalent bonds share electrons equally"

We have:

Therefore, the statement which best explains the difference between polar and nonpolar covalent bonds is "Polar covalent bonds share electrons unequally, while nonpolar covalent bonds share electrons equally"

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Answer:

i is the correct answer.

Explanation:

the RAM of aluminum is indeed 27. And since the RAM of substances are measured in terms of the C-12 isotope then R indeed explains why the RAM Al is 27.

Answer:

A lunar phase is simply the shape of the sunlit part of the Moon, as seen from Earth. Phases are so strikingly obvious that we almost take them for granted. Moreover, they can be observed easily throughout the month from the backyard or via a simple glance out the window.

The Moon's shape changes for the following reasons:

The Moon orbits Earth.

Both Earth and the Moon orbit the Sun.

The Moon's orbit is the same length as the time it spins on its axis (about 28 Earth days), which means that we see the same part of the lunar surface all month.

The Sun illuminates both Earth and the Moon.

Get to Know the Lunar Phases

There are eight phases of the Moon to track each month.

New Moon: During New Moon, the side of the Moon facing us is not illuminated by the Sun. At this time, the Moon is not up at night, but it is up during the day. We just can't see it. Solar eclipses can occur during the New Moon, depending on how the Sun, Earth, and Moon line up in their orbits.

Waxing Crescent: As the Moon waxes (grows) into its crescent phase, it begins to show up low in the sky right after sunset. Look for a silvery-looking crescent. The side facing the sunset direction will be lit up.

First Quarter: Seven days after New Moon, the Moon is in first quarter. Only half of it is visible for the first half of the evening, and then it sets.

Waxing Gibbous: After First Quarter, the Moon appears to grow into a gibbous shape. Most of it is visible, except for a dark sliver that shrinks over the next seven nights. Look for the Moon at this time during the afternoon, too.

Full Moon: During the Full Moon, the Sun lights up the entire surface of the Moon that faces Earth. It rises just as the Sun sets and disappears beneath the western horizon when the Sun rises the next morning. This is the brightest phase of the Moon and it washes out the nearby part of the sky, making it difficult to see stars and faint objects such as nebulae.

Ever hear of a Super Moon? That's a Full Moon that happens when the Moon is closest in its orbit to Earth. The press likes to make a big deal about this, but it's really a very natural thing: On occasion, the Moon's orbit brings it closer to Earth. Not every month has a Super Moon. Despite the hype about Super Moons in the media, it's difficult for the average observer to notice one, because the Moon might appear only slightly larger in the sky than normal. In fact, the well-known astronomer Neil deGrasse Tyson pointed out that the difference between a regular Full Moon and a Super Moon is analogous to the difference between a 16-inch pizza and a 16.1-inch pizza.

Lunar eclipses occur only at Full Moons because the Moon is passing directly between Earth and the Sun in its orbit. Due to other perturbations in its orbit, not every Full Moon results in an eclipse.

The other Full Moon variation that often grabs media attention is a "Blue Moon." That's the name given to the second Full Moon that occurs in the same month. These don't happen all the time, and the Moon certainly doesn't appear blue. Full Moons also have colloquial names based on folklore. It's worth reading about some of these names; they tell fascinating stories about early cultures.

Waning Gibbous: After the glorious appearance of Full Moon, the lunar shape starts to wane, meaning it gets smaller. It's visible later at night and into the early morning, and we see a steadily shrinking shape of the lunar surface that's being lit up. The side that is lit up is facing toward the Sun, in this case, the sunrise direction. During this phase, look for the Moon during the day—it should be in the sky in the morning.

Last Quarter: At Last Quarter, we see exactly half the sunlit surface of the Moon. It can be seen in the early morning and daytime sky.

Waning Crescent: The last phase of the Moon before returning to New Moon is called Waning Crescent, and it is exactly what it says: a steadily-shrinking crescent phase. We can see only a small sliver from Earth. It's visible in the early morning, and by the end of the 28-day lunar cycle, it has vanished almost entirely. That brings us back to New Moon to start the new cycle.

Citation for work-Petersen, Carolyn Collins. "The Once-Mysterious Phases of the Moon Explained." ThoughtCo, Aug. 27, 2020, thoughtco.com/what-are-moon-phases-3883581.

Explanation:  

Something shorter-The different shapes of the lit portion of the Moon that can be seen from Earth are known as phases of the Moon. Each phase repeats itself every 29.5 days. The same half of the Moon always faces the Earth, because of tidal locking. So the phases will always occur over the same half of the Moon's surface.

Answer:

17.78 gm

Explanation:

2 H20 mole weight = 36 gm

   which leads to 32 gm   O2

36 / 32   =  20 / x      x = 17.78 gm

There would be two moles.

To find the number of molecules in a compound, you will need to know the mass of the compound and its molecular weight. The molecular weight is the sum of the atomic weights of all the atoms in the molecule. Once you know the molecular weight, you can use the following formula to calculate the number of molecules:

Number of molecules = (Mass of the compound in grams / Molecular weight) x Avogadro's number

We know that;

1 mole contains 6.02 * 10^23 molecules

x moles would contain 1.20 x 10^24

x = 2 moles

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The statement that is not true about rate laws is: "if the activation energy is small, the rate constant is also small, and the reaction is slower." Option b is correct.

In reality, if the activation energy is small, the rate constant is larger, and the reaction is faster. This is because a smaller activation energy means that more molecules have enough energy to react, so there are more effective collisions between reactants.

The other statements in the options are true about rate laws, including the fact that they are experimentally determined, that larger values of k indicate faster reaction rates, and that temperature affects the rate constant. Therefore, Option b is correct.

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--The complete question is, Which of the following is not true about rate laws?

a. rate laws are experimentally determined to relate the rate of the reaction to the concentrations.

b. if the activation energy is small, the rate constant is also small, and the reaction is slower. c. larger values of k, the rate constant, indicate faster reaction rates. a catalyst can lower the activation energy of a reaction by providing an alternate path between reactants and products.

c. since the rate constant is dependent on temperature, temperature must be recorded and held constant in order to study other kinetic aspects of the reaction the frequency factor, a, indicates how often a collision of reactants leads to the desired product. the arrhenius equation gives the relationship between the rate constant and the thermodynamics of the reaction.

d. the activation energy, ea, is the energy required to start the reactions. high temperature correlates to a larger rate constant and a faster reaction.--

A reason for only ‘roughly’ twice as much hydrogen gas being produced at the cathode as oxygen gas at the anode in the electrolysis of water is that the number of moles of hydrogen is twice as that of oxygen in the making of water.

Consider the chemical formula of water which is H2O. Based on this chemical formula, we conclude that water is made from two atoms of hydrogen and one atom of oxygen.

When the electrolysis of water occurs, hydrogen and oxygen will separate. Hydrogen will move toward the cathode whereas oxygen will move toward the anode. However, as the number of moles of hydrogen in the making of water is twice as that of oxygen hence, twice as much hydrogen gas will be produced as the cathode.

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