Three ions that contain the element phosphorus are phosphate (PO43–), hydrogen phosphate (HPO42–), and dihydrogen phosphate (H2PO4–). Compare the formulas of these three ions. Also notice any other instances in which hydrogen is added to a polyatomic ion from the table. Then complete the description of the pattern you see. Select the correct answer from each drop-down menu

Answer:

Substance A is deadlier than Substance B,

Explanation:

Simple :)

Answer:

D. 0.75 grams

Explanation:

The data given on the iridium 182 are;

The half life of the iridium 182, \(t_{(1/2)}\) = 15 years

The mass of the sample of iridium, N₀ = 3 grams

The amount left, N(t) after two half lives is given as follows;

\(N(t) = N_0 \left (\dfrac{1}{2} \right )^{\dfrac{t}{t_{1/2}} }\)

For two half lives, t = 2 × \(t_{(1/2)}\)

∴ t = 2 × 15 = 30

\(\dfrac{t}{t_{(1/2)}} = \dfrac{30}{15} = 2\)

\(\therefore N(t) = 3 \times\left (\dfrac{1}{2} \right )^2 = 0.75\)

∴ The amount left, N(t) = 0.75 grams

The empirical formula for pyrite is FeS2.

HOW TO CALCULATE EMPIRICAL FORMULA:

46.5 mass % Fe = 46.5g of Fe

53.5 mass % S = 53.5g of S

Fe = 46.5g ÷ 56g/mol = 0.83mol

S = 53.5g ÷ 32g/mol = 1.67mol

Fe = 0.83mol ÷ 0.83 = 1

S = 1.67mol ÷ 0.83 = 2.014

Approximately, the ratio of Fe to S is 1:2. Therefore, the empirical formula of pyrite is FeS2.

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A) F2 and C2H5OH (Heterogeneous mixture)B) H2O and CH3OH (Homogeneous mixture)C) LiCl and C10H20 (Heterogeneous mixture)D) CH4 and C2H5OH (Heterogeneous mixture).

The pair of substances that are most likely to form a homogeneous solution is B. H2O and CH3OH. A homogeneous mixture is one in which the components are evenly distributed throughout the mixture. These types of solutions have uniform properties and the same composition throughout.A heterogeneous mixture is one in which the components are not evenly distributed. This means that the mixture has distinct regions or phases that are visibly different from one another. The following are the most likely pairs of substances to form a homogeneous solution:A) F2 and C2H5OH (Heterogeneous mixture)B) H2O and CH3OH (Homogeneous mixture)C) LiCl and C10H20 (Heterogeneous mixture)D) CH4 and C2H5OH (Heterogeneous mixture).

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The process of heating a solid fuel so that it liberates gaseous fuel vapors is called B. Pyrolysis.

Pyrolysis is a chemical process in which a substance is decomposed by heat in the absence of oxygen or with limited oxygen. This process involves the thermal decomposition of organic material at elevated temperatures in the absence of oxygen.

Pyrolysis is used to convert solid fuels, such as coal, into gaseous fuels, such as methane and hydrogen. The resulting gaseous fuels can then be used for energy production or other industrial processes.

Therefore, the correct answer is option B. Pyrolysis.

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To achieve the desired pH of 3.87, one would need to add 4.7 moles of HCl to the 1-liter buffer solution.

To calculate the amount of HCl that must be added to the buffer, we need to determine the change in concentration of acetic acid required to achieve the desired pH.

Volume of the buffer solution = 1 liter

Initial concentration of acetic acid ([HA]) = 1.3 M

Initial concentration of sodium acetate ([A-]) = 0.75 M

Desired pH = 3.87

pKa of acetic acid = 4.75

Using the Henderson-Hasselbalch equation:

pH = pKa + log([A-]/[HA])

3.87 = 4.75 + log(0.75/[HA])

Rearranging the equation:

log(0.75/[HA]) = 3.87 - 4.75

log(0.75/[HA]) = -0.88

Taking the antilog of both sides:

0.75/[HA] = 10^(-0.88)

[HA] = 0.75 / 10^(-0.88)

[HA] = 0.75 / 0.125

[HA] = 6 M

To find the change in concentration of acetic acid:

Change in [HA] = Initial [HA] - Final [HA]

Change in [HA] = 1.3 M - 6 M

Change in [HA] = -4.7 M

Therefore, to achieve the desired pH of 3.87, you would need to add 4.7 moles of HCl to the 1-liter buffer solution.

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Answer:

The mathematical equation, N = n × NA, can be used to find the number of atoms, ions or molecules in any amount (in moles) of atoms, ions or molecules: 10 moles of helium atoms = 10 × (6.022 × 1023) = 6.022 × 1024 helium atoms.

Explanation:

Fluorine atoms = 1.517 x 10²³

The mole is the number of particles contained in a substance

1 mol = 6.02.10²³

Moles can also be determined from the amount of substance mass and its molar mass

\(\large{\boxed{\boxed{\bold{mol=\frac{mass}{molar\:mass}}}}\)

Proust stated the Comparative Law that compounds are formed from elements with the same Mass Comparison so that the compound has a fixed composition of elements

\(\tt mass~F=\dfrac{4.Ar~F}{MW~C_2F_4}\times mass~C_2F_4\\\\mass~F=\dfrac{4.19}{100}\times 6.3=4.788~gr\)

\(\tt =\dfrac{4.788}{19}=0.252\)

\(\tt 0.252\times 6.02\times 10^{23}=1.517\times 10^{23}\)

Among various electrochemistry technologies, lithium-ion batteries are considered the most cost-efficient due to their widespread use, decreasing prices, and high energy density.

Lithium-ion batteries have emerged as the dominant technology for energy storage in portable electronics, electric vehicles, and renewable energy systems. They offer a combination of high energy density, long cycle life, and relatively low self-discharge rates compared to other electrochemical technologies. These factors make them highly cost-efficient in a variety of applications.

One example of the cost efficiency of lithium-ion batteries can be seen in the electric vehicle (EV) market. Over the years, advancements in lithium-ion battery technology and increased production scale have led to significant cost reductions. This has resulted in a decline in the prices of EVs, making them more accessible to consumers. The cost efficiency of lithium-ion batteries has also been demonstrated in the renewable energy sector. Energy storage systems based on lithium-ion batteries allow for efficient integration of intermittent renewable energy sources, such as solar and wind power, into the grid. This helps stabilize the grid and reduce reliance on fossil fuels.

Furthermore, the high energy density of lithium-ion batteries enables compact and lightweight designs, making them suitable for portable electronics like smartphones and laptops. This not only enhances user convenience but also contributes to cost efficiency by reducing material and transportation costs. Additionally, the long cycle life of lithium-ion batteries ensures durability and longevity, further enhancing their cost efficiency as they require fewer replacements over their lifespan.

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The correct answer to the question is: A) increase, decrease

The first ionization energies of the elements increase as you go from left to right across a period of the periodic table, and decrease as you go from the bottom to the top of a group in the table.

1. Going from left to right across a period, the atomic number increases, which means there are more protons in the nucleus. This results in a stronger attraction between the positively charged nucleus and the negatively charged electrons. As a result, it becomes harder to remove an electron, requiring more energy, and therefore the first ionization energy increases.

2. Going from the bottom to the top of a group, the atomic size decreases. This is because the number of energy levels or shells decreases, and the electrons are closer to the nucleus. As the distance between the nucleus and the outermost electrons decreases, the attractive force between them increases. Consequently, it becomes easier to remove an electron, requiring less energy, and therefore the first ionization energy decreases.

Therefore, the correct answer to the question is:

A) increase, decrease

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For an ideal gas, the internal energy depends only on its temperature. As the process is isobaric, there is no change in the internal energy. ΔU = 0.

We know that for an isobaric process (pressure is constant), the work done by the gas is given by:

W = PΔV

where W is the work, P is the constant pressure, and ΔV is the change in volume.

For an ideal gas, the internal energy depends only on its temperature. As the process is isobaric, there is no change in the internal energy.

Therefore, ΔU = 0.

Answer:ΔU = 0

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A star evolves off the main sequence when helium is exhausted in the stellar core.Our solar system’s gas giant planets (and those of other solar systems) did not become stars because they are not massive enough to generate the high temperatures and pressures necessary to start hydrogen fusion in the core.

Stars evolve off the main sequence when the nuclear fusion in their cores is no longer capable of supplying sufficient energy to maintain the gravitational energy, causing it to contract and the outer layers to expand and cool. When hydrogen runs out in the core of a star, the core shrinks and heats up and the outer layers expand, resulting in a red giant. However, when helium is consumed in the core, the core collapses and heats up, causing the outer envelope to get expelled, and the core evolves into a white dwarf.

A gas giant planet's temperature and pressure aren't high enough to generate fusion. They aren't dense enough to generate the heat required for nuclear fusion. Therefore, gas giant planets do not generate their own light and heat in the same way as stars. They can emit more energy than they obtain from the sun if they have a significant atmosphere. The planets in the solar system, such as Jupiter and Saturn, are examples of gas giants.

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The soil mineral most likely to be leached away during a hard rain is potassium (K+). Among the options given, potassium (K+) is the soil mineral that is most susceptible to leaching during heavy rainfall.

When it rains heavily, water percolates through the soil, carrying dissolved minerals with it. Potassium ions are highly soluble and mobile in water, making them prone to being washed away from the soil. This leaching process can result in the depletion of potassium in the top soil, which can have significant implications for plant growth and nutrient balance. Other minerals like sodium (Na+) and nitrate (NO3-) may also be leached to some extent, but potassium leaching is generally more pronounced due to its high solubility and low affinity for soil particles. Calcium (Ca++) is less likely to be leached away during rainfall because it forms insoluble compounds in the soil, making it more stable and less mobile.

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Hydrogen can be expected to escape significantly faster rate than sulfur dioxide through a porous container due to its smaller molecular size.

The rate at which a gas escapes through a porous container depends on several factors, including the size of the gas molecules and the size of the pores in the container. Generally, smaller gas molecules can escape more quickly through smaller pores.

Hydrogen has a smaller molecular size compared to sulfur dioxide . The molecular weight of hydrogen is 2 g/mol, while the molecular weight of sulfur dioxide is 64 g/mol. Due to its smaller size, hydrogen molecules can pass through smaller pores more easily than sulfur dioxide molecules.

The exact ratio of how much faster hydrogen escapes compared to sulfur dioxide would depend on the specific conditions and the properties of the porous container.

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Running the reaction at a higher temperature would cause the reaction to become darker brown.

When a reaction is run at a higher temperature, the molecules have more kinetic energy, which leads to more frequent and energetic collisions between them.

This can cause the reaction to proceed faster and generate more product. In some cases, a faster reaction can also lead to the formation of byproducts, which can cause the color of the reaction mixture to change.

In this particular case, it's possible that the higher temperature could cause the reactants to react more readily and form products that are darker in color.

Decreasing the volume of the container or increasing the pressure in the reaction vessel would not necessarily cause the reaction to become darker brown.

These changes could potentially affect the rate of the reaction, but they are not likely to directly affect the color of the reaction mixture. Running the reaction at a lower temperature could slow down the reaction and potentially decrease the formation of byproducts, but it would not necessarily cause the reaction to become darker brown.

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According to the department of transportation defines hazardous materials as any substance in any form or quantity that poses an unreasonable risk to Health ,Safety, and property when transported.

hazardous materials are defined as a substance or material which can cause any kind of harm to people or animals.

To produce goods and other necessities for today's society, many factories and industries use hazardous materials.

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The mixing pair of reactants will result in a precipitation reaction are:a) K2SO4(aq) and Hg2(NO3)2(aq)The reaction can be represented as:K2SO4(aq) + Hg2(NO3)2(aq) → 2KNO3(aq) + Hg2SO4(s)

Precipitation reactions occur when cations and anions come together to form an insoluble ionic compound or salt, also known as a precipitate, that settles out of the solution because it is not water-soluble.The process involves two solutions containing soluble salts that combine and form an insoluble compound that appears as a solid, called a precipitate, which settles at the bottom of the container.

Precipitation reactions can occur when an insoluble substance, such as a salt or a solid, is produced as a result of combining two or more solutions with specific ions. It is necessary to mix two solutions that contain ions that will react and produce an insoluble compound or a precipitate.For example, K2SO4(aq) + Hg2(NO3)2(aq) → 2KNO3(aq) + Hg2SO4(s)This equation represents a precipitation reaction because Hg2SO4(s), an insoluble solid, forms when K2SO4(aq) and Hg2(NO3)2(aq) are combined.

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The anticodons corresponding to the codons on the mRNA (from part A) is 5' CGA - AAA - GUU 3'.

Anticodons are nucleotide sequences on tRNA molecules that are complementary to the codons found on mRNA molecules.

The anticodons on tRNA molecules determine the amino acid that is carried by the tRNA.

Just like codons, anticodons occur in triplets of nucleotide sequences.

Considering the codons on the mRNA molecule:

3’ GCT | TTT | CAA | AAA ’5

The complementary anticodon will be:

5' CGA - AAA - GUU 3'

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The valence electrons of oxygen are; 2s2 2p4

The valence electrons of nitrogen are 2s2 2p3

This is how we can be able to know the number of valence electrons.

Valence electrons are the electrons in the outermost shell of an atom. They are the electrons involved in chemical reactions and bonding with other atoms. In the case of nitrogen, its electron configuration is 1s^2 2s^2 2p^3, which means it has two electrons in the first shell, two electrons in the second shell, and three electrons in the outermost p orbital, giving it a total of 5 valence electrons.

Oxygen has an electron configuration of 1s^2 2s^2 2p^4, which means it has two electrons in the first shell, two electrons in the second shell, and four electrons in the outermost p orbital, giving it a total of 6 valence electrons.

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The bicameral systems can be traced back to different representation for the States and the people. In a bicameral legislature, the legislative branch is divided into two houses or chambers, each with its unique functions, powers, and structure.

In a bicameral system, the states have representation in one chamber of the legislature, while the people are represented in the other chamber. A bicameral legislature is found in various countries, including Australia, India, Canada, and the United States. This type of legislature was initially used in ancient Greece and Rome. The goal of a bicameral system is to ensure that all voices are heard in the legislative process and that the process is balanced and impartial.

In a bicameral legislature, the lower chamber or house, which is often referred to as the "people's house," is typically elected by the citizens of the country. The upper chamber or house, on the other hand, is usually made up of members who represent each state or region in the country. The purpose of this is to ensure that each state or region has an equal say in the legislative process.

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Answer:

the answer is b beacuse the substance changed

The given statement, "When pure components are mixed to form an ideal solution, no change in volume, internal energy, enthalpy, or entropy should be observed," is false.

Explanation: An ideal solution is a solution that obeys Raoult's law. When two pure components are mixed to form an ideal solution, the enthalpy of the solution is equal to the sum of the enthalpies of the pure components. Similarly, the entropy of the solution is equal to the sum of the entropies of the pure components. This means that there is no change in enthalpy or entropy when pure components are mixed to form an ideal solution.

However, there is a change in volume and internal energy when pure components are mixed to form an ideal solution. The change in volume is due to the mixing of the two components, and the change in internal energy is due to the interaction between the molecules of the two components. Therefore, the given statement is False.

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To generate 5.3 moles of \(N_{5}O_{7}\), roughly 1.595 * \(10^{25}\) molecules of N are required.

To determine the number of molecules of N (nitrogen) needed to produce 5.3 moles of \(N_{5}O_{7}\), we need to consider the stoichiometry of the compound \(N_{5}O_{7}\).

The formula \(N_{5}O_{7}\) indicates that there are five nitrogen atoms (N) in one molecule of \(N_{5}O_{7}\). Therefore, we can use the concept of Avogadro's number to calculate the number of molecules of N required.

Avogadro's number states that there are 6.022 × \(10^{23}\) particles (molecules or atoms) in one mole of any substance. In this case, we need to convert the given quantity of moles (5.3 moles) to the corresponding number of molecules.

First, we calculate the number of moles of N in 5.3 moles of \(N_{5}O_{7}\):

5.3 moles \(N_{5}O_{7}\) × 5 moles N / 1 mole N5O7 = 26.5 moles N

Then, we can convert the moles of N to the number of molecules of N using Avogadro's number:

26.5 moles N × 6.022 × \(10^{23}\) molecules / 1 mole = 1.595 × \(10^{25}\) molecules of N

Therefore, approximately 1.595 × \(10^{25}\) molecules of N are needed to produce 5.3 moles of \(N_{5}O_{7}\).

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1,200,000,000,000

Multiple 10 to the power of 11

10x10x10x10x10x10x10x10x10x10x10=100,000,000,000

Then multiply by 12

Answer:

about 2 moles

Explanation:

the real answer not rounded is 1.9926466357524e-12

the fertilizers in decreasing order of mass percentage of nitrogen is NH3>NH4NO3>(NH4)2HPO4>(NH4)2SO4>KNO3>(NH4)H2PO

As you shall discover, nitrogen is indeed a gas with a room temperature and must be extremely cold to change into a liquid. When nitrogen gets cold sufficiently to become a liquid, it will begin to boil when it is exposed to air at normal temperature. Nitrogen that is currently boiling expands when it warms up and turns back into a gas.

7 is the atomic number of the chemical element nitrogen it has seven protons in its nucleus. Two nitrogen atoms that are closely bonded to one another make up the chemical molecule known as molecular nitrogen (N2). At standard pressures and temperatures, molecule nitrogen is a tasteless, odorless, and inert gas.

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It is possible for a substance  to go directly from solid to gaseous state due to sublimation.

Sublimation is defined as a process in which transition  of a substance takes place  from solid to gas phase without passing through the intermediate liquid phase.

It is an endothermic process which occurs at temperatures and  pressure below the triple point. Reverse process of sublimation is deposition in which substances in gaseous phase directly go into solid phase.

It only refers to the change in state  and not for describing transformation  of substances. Sublimation requires an additional amount of energy and is an endothermic change proceeding with absorption of energy.

The enthalpy of sublimation is calculated by adding enthalpy of fusion and enthalpy of vaporization.

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Answer:

5

Explanation:

Sorry, don't have one

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