Calculate the hydrogen ion concentrations in each of the following solutions.
a. pH = 1.05
b. pH = 5.65
c. pH = 2.42

Answer:

D. Water vapor in the air condenses to form liquid water or ice

Explanation:

took test on e2020

Answer: B!!!

Explanation:

Answer:

The pH of the solution formed is approximately 12.614.

Explanation:

First, we need to calculate the molarity of the Ba(OH)₂ solution:

moles of Ba(OH)₂ = mass / molar mass = 3.470 g / (137.327 g/mol + 2*15.9994 g/mol) = 0.01156 mol

molarity = moles / volume = 0.01156 mol / 0.5631 L = 0.02055 M

Ba(OH)₂ is a strong base, and it will dissociate completely in water to give two OH⁻ ions for every Ba(OH)₂ molecule:

Ba(OH)₂ → Ba²⁺ + 2OH⁻

So the concentration of OH⁻ ions in the solution is 2 * 0.02055 M = 0.0411 M.

Now we can use the equation for the ion product constant of water to calculate the pH of the solution:

Kw = [H⁺][OH⁻] = 1.0 x 10⁻¹⁴

pH + pOH = 14.00

pOH = -log[OH⁻] = -log(0.0411) = 1.386

pH = 14.00 - pOH = 14.00 - 1.386 = 12.614

Therefore, the pH of the solution formed is approximately 12.614.

The dollar amount of your investment in stock d is $96,230. To determine the dollar amount of your investment in stock d, we need to use the following formula:

Portfolio Beta = (Weight of Stock D x Beta of Stock D) + (Weight of Stock E x Beta of Stock E)
Since the beta of the portfolio is equal to the market beta, which is generally assumed to be 1, we can rewrite the formula as:
1 = (Weight of Stock D x 0.83) + (Weight of Stock E x 1.42)
We know that the total value of the portfolio is $230,000, so we can use this information to solve for the weight of stock D:
Weight of Stock D = (230,000 - (Weight of Stock E x Value of Stock E)) / Value of Stock D

We don't know the value of stock E, but we know that the total value of the portfolio is divided between the two stocks, so we can rewrite the formula as:
Weight of Stock D = (230,000 - (Weight of Stock E x (230,000 - Value of Stock D))) / Value of Stock D
Solving for Weight of Stock D gives us:
Weight of Stock D = $96,230

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The Ring of Fire also referred to as the Circum-Pacific Belt, is a path along the Pacific Ocean characterized by active volcanoes and frequent earthquakes. The majority of Earth's volcanoes and earthquakes take place along the Ring of Fire.

Volcanoes are associated with the belt throughout its length; for this reason, it is called the “Ring of Fire.” A series of deep ocean troughs frame the belt on the oceanic side, and continental landmasses lie behind. The Ring of Fire was formed as oceanic plates slid under continental plates. Volcanoes along the Ring of Fire are formed when one plate is shoved under another into the mantle – a solid body of rock between the Earth's crust and the molten iron core – through a process called subduction. The Ring of Fire is a string of volcanoes and sites of seismic activity, or earthquakes, around the edges of the Pacific Ocean. Roughly 90% of all earthquakes occur along the Ring of Fire, and the ring is dotted with 75% of all active volcanoes on Earth.

Answer:

you have to use the avogadro's constant of 6.023×10^23 to calculate the number of molecules of carbon dioxide.and you also have to use the molecular mass which is 44.

35.5/44×6.023×10^23

=4.85×10^23

I hope this helps and sorry if it's wrong

Answer:

Qué es Crecimiento poblacional:

El crecimiento poblacional se refiere al incremento del número de habitantes en un espacio y tiempo determinado, el cual se puede medir a través de una fórmula aritmética. También se puede emplear como sinónimo el término crecimiento demográfico.

Cuando se hace mención al crecimiento poblacional se puede hacer referencia a cualquier especie animal, sin embargo, se suele usar para referirse a los seres humanos, en especial cuando se realizan investigaciones acerca del crecimiento de la población.

Los datos que se obtienen de estos análisis son de gran importancia, tanto para los gobiernos de un país como, para las diferentes organizaciones internacionales.

Cabe resaltar que durante el siglo XX la población de seres humanos ha crecido y sigue creciendo en gran porcentaje, lo que ha generado preocupación, en especial por sus consecuencias sobre el uso y cuidado de los recursos naturales, entre otros.

Las zonas urbanas son las que presentan mayor crecimiento demográfico, así como, los países en vías de desarrollo. Por el contrario, el crecimiento poblacional es menor en los países desarrollados.

Por ejemplo, el crecimiento poblacional en México ha ido en aumento a lo largo de su historia, es el país con más habitantes hispanohablantes en América Latina. México tiene una población aproximada a 130 millones de habitantes, y se estima que seguirá creciendo gracias a diversos factores gracias a su continuo desarrollo político, económico y social.

Formal Charge is a concept used to keep track of the distribution of electrons in a molecule or ion. It helps in determining the most probable distribution of electrons in a molecule or ion and helps in predicting the stability of a molecule. In this article, you will learn how to calculate the formal charge of an atom.

To calculate the formal charge of an atom, follow these steps:

Determine the number of valence electrons in an isolated neutral atom of the element.

Assign electrons in the molecule to the atoms in the Lewis structure. Assign one electron to each shared pair and one electron to each unshared electron.

Count the number of electrons assigned to each atom.

Subtract the assigned electrons from the number of valence electrons in the neutral atom to find the formal charge on each atom.

Repeat steps 2 to 4 for all atoms in the molecule to determine the formal charge for each atom.

In a neutral molecule or ion, the total formal charge is equal to zero. The sum of the formal charges for all atoms in a molecule or ion is equal to the overall charge of the molecule or ion.

It's important to note that the formal charge is just a calculated value and does not necessarily reflect the real distribution of electrons in a molecule. However, it is useful for determining the most stable distribution of electrons in a molecule and for predicting chemical reactions.

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During the day, due to the existence of sunlight, the procedure of photosynthesis elevations over that of respiration. Photosynthesis uses carbon dioxide to produce carbohydrates removing oxygen as a byproduct. During the night, because there is no sunlight, the rate of photosynthesis decreases. This, therefore, drives the rate of respiration to surpass the speed of photosynthesis. In respiration, oxygen is consumed and carbon dioxide is dismissed.

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Answer:

They have the exact same name at the first but the yacca plant must be eaten by the yacca moth because if the animal doesn't eat it will die of hunger

Answer:

its B

Explanation:

The relationship between yucca moths and yucca plants is an example of obligate mutualism. Many species of yucca plant can be pollinated by only one species of yucca moth, while those yucca moths use the yucca flowers as a safe space to lay their eggs.

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The student did not get any crystals to collect because copper (II) nitrate is a soluble salt, meaning it readily dissolves in water. Unlike copper (II) sulphate, which is insoluble and can crystallize out of solution, copper (II) nitrate remains in solution even after evaporation of the water.

When the student added copper (II) carbonate to dilute nitric acid, a reaction occurred to produce copper (II) nitrate and carbon dioxide gas. However, since copper (II) nitrate is soluble, it remained dissolved in the solution. The student then warmed the solution to drive off some water, but this step did not cause the copper (II) nitrate to crystallize because it remains soluble in the remaining water.

Leaving the solution to crystallize for several days did not result in the formation of copper (II) nitrate crystals because there was no solid salt to crystallize out. The water gradually evaporated, but the dissolved copper (II) nitrate simply became more concentrated in the remaining solution.

To obtain copper (II) nitrate crystals, the student would need to use a different method. One possible approach is to use a more concentrated nitric acid solution or to try different solvents that can selectively precipitate the copper (II) nitrate from the solution. It's important to note that working with chemicals and performing experiments should always be done with proper safety precautions and under the supervision of a qualified individual.

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Answer: solo necesito puntos lo siento

Explanation:

Answer:

Cadmium has larger atomic radius than sulfur.

Explanation:

Down a period, atomic radii decrease from left to right due to the increase in the number of protons and electrons across a period: when a proton is added the pull of the electrons towards the nucleus is larger, so the size of the atom decreases.

Hence, you can compare the elements that belong to a same period and predict that the atom with lower atomic number (number of protons) will haver larger atomic radius. With that:

Oxygen and fluorine are in the period 3, being oxygen to the left of fluorine, so oxygen is larger than fluorine.

Sulfur and chlorine are in the period 4, being sulfur to the left of chlorine, so sulfur is larger than chlorine.

Now see whan happens down a group. Atomic radius increases from top to bottom within a group due to electron shielding. That permits you to compare the size of the elements in a group:

Fluorine and chlorine are in the same group (17), with chlorine directly below fluorine, so the atomic radius of chlorine is larger than the atomic radius of fluorine.

Sulfur and oxygen are in the same group (16), with sulfur directlly below oxygen, so sulfur the atomic radius of sulfur is larger than the atocmi radius of oxygen.

So far, you can rank the atomic radius of sulfur, chlorine, fluorine, and oxygen, in increasing order as:

O < F < Cl < S, concluding that O, F, and Cl have smaller atomic radius than S.

Cadmiun, Cd, is to the left and below sulfur, so both electron shielding (down a group) and increase of the number of protons (down a period) lead to predict the cadmium has a larger atomic radius than sulfur.

When a soda bottle is opened, the decrease in pressure causes the amount of gas that can be dissolved in the water to decrease.

This is because as the pressure decreases, the gas molecules become less soluble in the water, leading to the formation of bubbles and the release of gas. This is why carbonated drinks lose their fizz once they have been opened for a while.

When a soda bottle is opened, the decrease in pressure has the effect of decreasing the amount of gas that can be dissolved in the water.

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Answer:

Renewable energy

Explanation:

on the other hand, typically emits less CO2 than fossil fuels. In fact, renewables like solar and wind power—apart from construction and maintenance—don't emit any CO2 at all. With renewable energy, you can breathe easier, stay cooler, and create a more comfortable world for generations to come.

Answer:

renewable energy comes from natural resources that can be replenished or replaced during an average human lifetime ; eg, Hydro, solar, wind etc.

fossil fuels can take thousands or even millions of years to naturally replenish; eg, natural gas, coal, oil.

Chemical weathering is an example of Airborne oxygen reacts with the iron content of rocks, causing them to change color.

Chemical weathering is a process in which things disintegrate due to chemical reactions, mostly with water and compounds dissolved in it, rather than mechanical processes.

A) Freezing water widens fissures in rocks is a physical phenomenon in which water stuck inside crevices in rocks expands when frozen at lower temperatures. In this method, no chemical changes are seen.

B) Plant roots force their way into cracks in rocks and finally shatter them. This is a physical process in which plant roots search for water and nutrients in fissures in rocks and eventually break them. There are no chemical changes visible here.

C) Oxygen in the air reacts with iron content in rocks, causing them to change color; as we can see, the color of rocks is changing as a result of a chemical reaction between oxygen in the air and iron content in the rocks. This process is also characterized by rock disintegration. As a result, this is referred to as chemical weathering.

D) Strong winds physically peel soft rock away, leaving harder rock behind There is no visible chemical change.

As a result, the correct solution is Option C), which provides completely adequate modifications to be classified as chemical weathering.

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The reason why compounds of Ti are colorless is due to their low-spin electronic state in an octahedral field.

In this state, all of the electrons are paired and unable to make transitions, resulting in no absorption of light and no color. Additionally, the ion has a noble gas electron configuration and only has very high energy electrons.

The ion also forms symmetrical complexes with perfect symmetry, further preventing absorption of light.

Unlike the compounds of most transition metal ions, those of titanium (Ti) are colorless because in an octahedral field, the low-spin electronic state has all of the electrons paired and is unable to make transitions.

This occurs due to the noble gas electron configuration, which results in only very high energy electron transitions.

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A large drainage canal contained a number of little check dams that prevented erosion in older, higher-lying areas.

A check dam is a tiny structure built over a drainage ditch to slow down water flow and prevent erosion. In first-developed areas, check dams and wide grassy slopes prevent erosion.

Water erodes curves on the outside and deposits eroded material on the interior, creating meanders. The positions of the curves change throughout time. A floodplain is produced as meanders erode in different directions. On both sides of a river, there is a large, flat region.

Floodplain erosion has been made worse by the clearing of catchments for urban and agricultural development for two reasons: first, due to changes in surface and groundwater discharge, and second, due to loss of soil strength.

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Answer:

na.

sodium

11( 2,81,)

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Answer:

A)  nuclear energy

Explanation:

The energy stored in uranium atoms which is found within the sun is nuclear energy.

Nuclear energy is a vary vital form of energy that is release when radioactive substances undergoes natural decay to give other ionizing particles.

Answer:

Hydrogen: 5

Carbon:3

Nitrogen:3

Oxygen: 9

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Answer:

D. formation of zinc from zinc sulphide ​

Explanation:

A redox reaction could be explained as an artificial reaction in which electrons are moved between two reactants partaking in it. This substitution of electrons can be recognized by examining the variations in the oxidation states of the reacting classes. The generation of hydrogen fluoride is an illustration of a redox reaction. We can crack the reaction down to investigate the oxidation and loss of reactants.

Answer:

The area of a star's atmosphere between its photosphere and corona, such as that of the sun, is referred to as its chromospheric region

Fe2S3 is The Empirical Formula Of A Compound Containing 53.70% Iron And 46.30% Sulfur.

Fe = 0.961 mol and S = 1.44 mol, Now divide them to get lowest empirical formula. When the subscripts in a chemical formula represent the simplest ratio of the kinds of atoms in the compound, the formula is called an empirical formula.

Most ionic compounds are described with empirical formulas. A molecular formula describes the actual numbers of atoms of each element in a molecule. A compound that contains ions and is held together by ionic bonds is called an ionic compound. The periodic table can help us recognize many of the compounds that are ionic:

When a metal is combined with one or more nonmetals, the compound is usually ionic. This guideline works well for predicting ionic compound formation for most of the compounds typically encountered in an introductory chemistry course. However, it is not always true (for example, aluminum chloride, AlCl3, is not ionic).

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Answer:

21 ..........................

Answer:

21 neutrons

Explanation:

Answer: 3 ,2, 6

Explanation:

3 Cu(NO3)2 + 2 K3PO4 → Cu3(PO4)2 + 6 KNO3

Answer:

88%.

Explanation:

The percentage yield of lead sulfate in this experiment is 88% if 2.53 is divided by 2.85 and multiply by 100. The percentage yield can be calculated when the experimental yield is divided by theoretical yield and then multiply by 100. The percentage yield tells us about the actual yield that is gained in the end of experiment which is lower than theoretical yield.

Answer: molecule of the kind normally found in living systems. Organic molecules are usually composed of carbon atoms in rings or long chains, to which are attached other atoms of such elements as hydrogen, oxygen, and nitrogen.

Explanation: