If 3 g of element C combine with 8 g of element D to
form compound CD, how many grams of D are
needed to form compound CD2?

URGENT HELP!!!

First, we have to calculate the molecular weights of each molecule:

Then, we have to calculate the number of grams of water. We can calculate them because the process of evaporation lets us know the water amount that was retired:

Then, we're gonna convert the grams of sodium carbonate alone (30.2 g) and the grams of water to moles:

It means that the mole relation is 1:1 approx, as it is the same amount for both. Then, the formula is going to be:

It means that the answer is A.

If The Bond Angle Between Two Adjacent Hybrid Orbitals Is 180 Hybridization is Sp2.

A space object appears to follow an orbit as it moves around another space object. A satellite is a spacecraft that orbits the planet. A natural satellites that matches the Earth nor moon is one possibility. Moons are satellites in the orbits of numerous nations. A man-made satellite, such as the Space Stations, provides an additional choice.

The positions of the electrons are dictated by the entire molecule when several atoms unite chemically to form a molecule, combining the atomic orbitals into molecular orbitals. The molecular orbitals are occupied by the electrons of the component atoms. There are two electrons in each orbital, and their spins vary. An atom's orbital is the area of space where an electron resides.

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The mass of carbon dioxide released during the reaction is 2.6 grams.

To determine the mass of carbon dioxide released during the reaction between sodium hydrogen carbonate (NaHCO3) and acetic acid (CH3COOH), we need to calculate the difference in mass before and after the reaction.

Before the reaction:

Mass of NaHCO3 = 3.8 g

Mass of acetic acid = 10.5 g

Total mass before the reaction = Mass of NaHCO3 + Mass of acetic acid = 3.8 g + 10.5 g = 14.3 g

After the reaction:

Mass of the contents of the reaction vessel = 11.7 g

To find the mass of carbon dioxide released, we calculate the difference in mass:

Mass of carbon dioxide released = Total mass before the reaction - Mass of the contents of the reaction vessel

= 14.3 g - 11.7 g

= 2.6 g

Therefore, the mass of carbon dioxide released during the reaction is 2.6 grams.

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Answer:

Explanation:

Decomposition reaction, also known as analysis or dissociation, is a type of chemical reaction in which a compound breaks down into simpler substances or elements. In this reaction, a single reactant undergoes a chemical change and produces two or more products.

The decomposition reaction can be represented by the general equation:

AB → A + B

Where AB is the reactant, and A and B are the products. The reactant AB is usually a compound, and it breaks down into its constituent elements or simpler compounds.

There are different types of decomposition reactions, including:

Thermal decomposition: It occurs when a compound is heated, resulting in its decomposition into simpler substances. For example, the thermal decomposition of calcium carbonate (CaCO3) produces calcium oxide (CaO) and carbon dioxide (CO2):

CaCO3 → CaO + CO2

Electrolytic decomposition: It takes place when an electric current is passed through an electrolyte, causing it to break down into its component ions. For instance, the electrolysis of water (H2O) leads to the decomposition into hydrogen gas (H2) and oxygen gas (O2):

2H2O → 2H2 + O2

Photochemical decomposition: It occurs when a compound undergoes decomposition due to exposure to light energy. Chlorine gas (Cl2) can decompose into chlorine atoms (Cl) under the influence of light:

Cl2 → 2Cl

These are just a few examples of decomposition reactions. They are important in various chemical processes and are used in industries, laboratory experiments, and natural phenomena. By understanding and controlling decomposition reactions, scientists can gain insights into the behavior of different compounds and develop practical applications in fields such as chemistry, materials science, and environmental science.

Answer:

Explanation:

reaction in which a compound breaks down into simpler substances or elements

Molecular orbital energy diagram for He2: The molecular orbital energy diagram is used to show the formation of a molecular bond in a molecule. It is a way to explain how electrons occupy molecular orbitals. The following is the main answer for filling in the molecular orbital energy diagram for the diatomic molecule He2:

He2 is a homonuclear diatomic molecule containing two helium atoms. Each helium atom has two valence electrons that participate in the bond formation process. To form the molecular orbital energy diagram, we will follow the steps mentioned below: The first step is to determine the atomic orbital energy of each helium atom, which is the same. We can use the periodic table to find the energy level of helium's valence electrons, which is 1s.
- The second step is to combine the atomic orbitals of helium to form molecular orbitals. Since the helium atoms are identical, the molecular orbitals produced will be degenerate, meaning that they have the same energy level. For He2, there will be four molecular orbitals formed, and they are labeled as σ1s, σ*1s, σ2s, and σ*2s.The third step is to populate the molecular orbitals with electrons. Since helium has two valence electrons, they will fill up the molecular orbitals from the lowest to the highest energy level. The molecular orbital energy diagram for He2 is shown below.

The molecular orbital energy diagram shows that He2 has a bond order of zero, which indicates that it is not a stable molecule. This is because the two electrons in the bonding molecular orbital are canceled out by the two electrons in the antibonding molecular orbital. Hence, the net effect of the electron pair in He2 is zero.

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Answer:

. Name a soluble compound that could be added to precipitate all of the iron ions from the solution.

Sodium Hydroxide.

Narrative form or storytelling is used to convey events, experiences, or information. In a narrative form, a single atom of Nitrogen, in the form of Nitrogen gas (N2) travels through different pools. The description of each pool it passes through as a source or a sink is given below:

In the atmosphere:Nitrogen gas is the most abundant gas in the atmosphere, it comprises about 78% of the earth's atmosphere. It is a component of many organic and inorganic compounds in the atmosphere.In the biosphere:Nitrogen-fixing bacteria or lightning can convert nitrogen gas into ammonia. This ammonia can be converted into nitrite and then nitrate through nitrification. This nitrate can be taken up by plants and utilized to make proteins and other molecules that are important for life.

Animals that consume these plants get the nitrogen that they need to build their own proteins. When an organism dies, decomposers like bacteria break down the proteins and return the nitrogen back to the soil in the form of ammonia and other organic compounds.In the atmosphere:Denitrification is the process that converts nitrate to nitrogen gas, which is then released into the atmosphere. This can be done by anaerobic bacteria and other microbes that live in soils and other places where there is little or no oxygen. Human activities that influence the movement of Nitrogen:Humans have a significant impact on the movement of nitrogen in the environment. One of the ways in which they do this is through the use of fertilizers, which contain high levels of nitrogen. These fertilizers can be washed into rivers and streams, where they can cause eutrophication.

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The correct option in this scenario is (e) The net force on each proton.

When an electron is brought in and placed at a position halfway in between the two protons, the net force on each proton will change. The introduction of the electron creates an electrostatic interaction between the protons and the electron.

Initially, when the two protons are 1.0e−6 cm apart, they repel each other due to their like charges. The force exerted by one proton on the other is repulsive, and the magnitudes of the forces on each proton are equal. This creates an equilibrium between the two protons.

However, when the electron is introduced at a position halfway between the protons, it experiences an attractive force from each proton due to the opposite charges. The presence of the electron alters the net forces acting on the protons. The net force on each proton will decrease because the attractive force from the electron partially cancels out the repulsive force between the protons.

Therefore, the correct answer is that the net force on each proton (option e) changes when an electron is brought in and placed at a position halfway in between the two protons.

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The solubility of ionic compounds depends on the nature of the ions and their charges.

Ionic compounds containing Na+, K+, and NO3- ions are generally soluble in water because they have small ionic radii and weak ionic interactions. On the other hand, ionic compounds containing Ba2+, PO4-3, and CO3-2 ions tend to be less soluble in water because they have larger ionic radii and stronger ionic interactions.

Ba2+ and PO4-3 ions tend to form insoluble compounds, such as Ba3(PO4)2, while Ba2+ and CO3-2 ions can also form insoluble compounds, such as BaCO3. K+ and CO3-2 ions may also form an insoluble precipitate when combined with certain cations such as Ba2+. Overall, the solubility of ionic compounds can be influenced by factors such as temperature, pH, and the presence of other ions in the solution.

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The Passengers the Balogna could carry if it were filled with hydrogen, and also if it were filled with helium are

\(\begin{tabular}{|l|l|} Passengers with $\quad \mathrm{H}_2:$ & 1007 \\ Passengers with $\mathrm{He}:$ & 928 \\\end{tabular}\)

(h) length of cylinder =100M

(r) radius of cylinder =15M

the volume of a cylinder: \($\pi r^2 \mathrm{~h}=\frac{22}{7} \times(15 \mathrm{~m})^2 \times 100 \mathrm{~m}$$=70714.3 \mathrm{~m}^3$\)

mass of air displaced

\(\begin{aligned}& =1.23 \mathrm{~kg} / \mathrm{m}^3 \times 70714.3 \mathrm{~m}^3 \\& =86978.57 \mathrm{Kg}\end{aligned}\)

when gas is H_2:

Let us assume a number of passengers =x

then, \($x \times 80 \mathrm{Kg}+70714.3 \mathrm{~m}^3 \times 0.090 \frac{\mathrm{kg}}{\mathrm{m}^3}=86978.57 \mathrm{~kg}$\)

x=1007.68 or 1007 people

when gas is{He}_e

then \($\quad x \times 80 \mathrm{~kg}+70714.3 \mathrm{~m}^3 \times 0.18 \frac{\mathrm{kg}}{\mathrm{m}^3}=86978.57 \mathrm{~kg}$\)

x=928.125 or 928 people

ANSWER:

\(\begin{tabular}{|l|l|} Passengers with $\quad \mathrm{H}_2:$ & 1007 \\ Passengers with $\mathrm{He}:$ & 928 \\\end{tabular}\)

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Your hands receive a heat transfer from the hot chocolate. Heat energy  is exchanged between two objects when their temperatures differ. When the two items reach the same temperature, the cooler object becomes warmer.

The vibrations of the hot chocolate's particles provide thermal energy. Some of this energy is transmitted from the chocolate to the milk's granules when you add cold milk to hot chocolate.

A fire emits thermal energy that warms a person's hands. One of the three ways that thermal energy can be delivered is by thermal radiation. Convection and conduction are the other two methods, both of which require matter to transfer energy.

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Answer:

A food chain will only have 3 or 4 levels (3 or 4 energy transfers).

Explanation:

Answer:

390.6 gram

Explanation:

Mass in gram = no of moles × molar mass

Mass in gram = 21.7×18

= 390.6 gram

Answer:

390.931576 grams

The standard molar enthalpy for the reaction C(s) + ½ O2(g) → CO(g) is -111KJ.

Molar enthalpy is the amount of energy per mole. In light of this, the primary distinction between enthalpy and molar enthalpy is that the former refers to the total heat content of a thermodynamic system, whereas the latter refers to the total heat per mole of reactant in the system.

C(s) + O₂(g) → CO₂(g)    ΔHO = -394 kJ ----(1)

CO₂(g) → CO(g) + 1/2O₂(g)      ΔHO = +283 kJ -----(2)

Adding 1 & 2

C(s) + ½ O₂(g) → CO(g)  

ΔHO = -394 kJ + 283 kJ

ΔHO = -111KJ.

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Complete question is " Find the standard molar enthalpy for the reaction C(s) + ½ 02(g) → CO(g)

Given that

C(s) + O2(g) → CO2(g) AHO = -394 kJ

CO2(g) → CO(g) + ¹/2O2(g) AHO = +283 kJ ".

Answer:

water and salt

Explanation:

A neutralization reaction is when an acid and a base react to form water and a salt and involves the combination of H+ ions and OH- ions to generate water. The neutralization of a strong acid and strong base has a pH equal to 7.

Hope this helps

PLS MARK BRAINLIEST

Answer:

c

c

Explanation:

mark me brainliest pls

Answer:

car

Explanation:

Cars have hydraulic brake circuit that operates a car's brake's on four wheels.

Answer:

barbers chair

Explanation:

Answer:

The distributive property of multiplication is used when we need to multiply a number with the sum of two or more addends. The distributive property of multiplication is applicable to addition and subtraction of two or more numbers.

Hope its helpful!

Answer:

The distributive property of multiplication is used when we need to multiply a number with the sum of two or more addends. The distributive property of multiplication is applicable to addition and subtraction of two or more numbers.

Explanation:

The concentration of A after 30 seconds when the given reaction obeys the rate law rate = k[A]²[B].

We use the initial concentration of A and B and the rate constant of the reaction to find the rates at these concentrations. Using the integrated rate law for a second-order reaction, we find the concentration of A after 30 seconds to be 0.0934 M.

Given reaction obeys the rate law, rate=k[A]²[B].

Here, the initial concentration of A= 0.10 M,

initial concentration of B = 0.05 M, and

rate constant, k = 2.0 × 10⁻⁴ M⁻¹s⁻¹

We have to find the concentration of A, after 30 seconds.

To find the concentration of A, we need to know the rate at 0.10 M and 0.05 M. Therefore, we have to calculate the rates at these concentrations.

rate1 = k[A]²[B]

= (2.0 × 10⁻⁴ M⁻¹s⁻¹)(0.10 M)²(0.05 M)

= 1.0 × 10⁻⁷ M/srate2

= k[A]²[B] = (2.0 × 10⁻⁴ M⁻¹s⁻¹)(0.09 M)²(0.04 M)

= 6.48 × 10⁻⁸ M/s

Using the integrated rate law for a second-order reaction: [A] = [A]₀ - kt where [A]₀ = initial concentration of A, k = rate constant, and t = time in seconds.

We know [A]₀ = 0.10 M and k = 2.0 × 10⁻⁴ M⁻¹s⁻¹.

Substituting the values in the above equation, we get: [A] = [A]₀ - kt= 0.10 M - (2.0 × 10⁻⁴ M⁻¹s⁻¹)(30 s)≈ 0.0934 M

Therefore, the concentration of A in the vessel after 30 seconds is 0.0934 M.

This question requires us to calculate the concentration of A after 30 seconds when the given reaction obeys the rate law rate = k[A]²[B].

We are given the initial concentration of A and B and the rate constant of the reaction. To find the concentration of A after 30 seconds, we need to calculate the rates at the initial concentrations of A and B.

Using the integrated rate law for a second-order reaction, we can find the concentration of A at any given time. We substitute the given values in the formula and solve for [A]. We get the concentration of A as 0.0934 M after 30 seconds. This calculation is based on the assumption that no other reaction is important.

The concentration of A after 30 seconds when the given reaction obeys the rate law rate = k[A]²[B]. We use the initial concentration of A and B and the rate constant of the reaction to find the rates at these concentrations. Using the integrated rate law for a second-order reaction, we find the concentration of A after 30 seconds to be 0.0934 M. This calculation assumes that no other reaction is important.

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Answer:

Chernobyl is a nuclear power plant in Ukraine that was the site of a disastrous nuclear accident on April 26, 1986.

Explanation:

A routine test at the power plant went horribly wrong, and two massive explosions blew the 1,000-ton roof off one of the plant’s reactors, releasing 400 times more radiation than the atomic bomb dropped on Hiroshima

Answer:

Mixtures are one product of mechanically blending or mixing chemical substances such as elements and compounds, without chemical bonding or other chemical change, so that each ingredient substance retains its own chemical properties and makeup.

Answer:

They grow slowly over time, they are made up of multiple organisms.

Explanation:

One polyp is one individual. A Coral is made up of several polyps. Each polyp is less than 1 centimeters but a coral is made of many polyp so the coral itself cant be 1 centimeters across.

Answer:

The new volume is 1,000ml

Explanation:

Mathematically, we know that the number of moles per ml(volume) should be constant irrespective of the increase.

Initially, we have a volume of 500 ml and number of moles of 2.5 moles

The ratio of the number of moles to the volume is 2.5/500 = 0.005 mole/ml

Now, this is expected to remain the same even if we have an increment.

let’s call the new volume x

0.005 mol/ml = 5 moles/x ml

x = 5/0.005 = 1,000 ml

Beta-sheet

The addition of tfe most likely caused secondary structural alterations in the peptide. the poly-L-secondary lysine's structure evolved from a beta sheet.

What is Beta-sheet ?

A typical motif of the typical protein secondary structure is the beta sheet, sometimes known as the "sheet" or "pleated sheet." Beta sheets are made up of beta strands (-strands) that are joined laterally by two or three backbone hydrogen bonds, resulting in a sheet that is typically twisted and pleated. A section of polypeptide chain known as a "-strand" has a backbone that is stretched and is typically 3 to 10 amino acids long. It has been suggested that the supramolecular connection of -sheets contributes to the development of the fibrils and protein aggregates seen in amyloidosis, particularly Alzheimer's disease.

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Answer:

fluorine

Explanation:

hope it helps

Given thermochemical equation for photosynthesis is as follows;6 CO2(g) + 6 H2O(l) + 2270 kJ → C6H12O6(s) + 6 O2(g)The main answer:From the above equation, it can be inferred that 6 moles of oxygen is produced when 2270 kJ of solar energy is consumed.

According to the given thermochemical equation for photosynthesis,6 CO2(g) + 6 H2O(l) + 2270 kJ → C6H12O6(s) + 6 O2(g)Here, it can be seen that 6 moles of oxygen is produced when 2270 kJ of solar energy is consumed.To find the mass of oxygen produced, we need to use stoichiometry.

First we need to find the moles of oxygen produced.Moles of oxygen produced = Moles of CO2 in the reaction.So, we can say that the moles of oxygen produced = 6 moles.Now, we can use the molar mass of oxygen which is 32 g/mol to find the mass of oxygen produced.Mass of oxygen produced = Moles of oxygen produced × Molar mass of oxygen= 6 mol × 32 g/mol= 192 gTherefore, the mass of O2 that is produced by photosynthesis when 2270 kJ of solar energy is consumed is 192 grams.

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1.2 × 10²³ molecules are there in 24 grams of  FeF₃ molecule. 1 mole is equal to 6.023 × 10²³ particles.

A mole is a important unit of measurement that chemists use in calculation. 1 mole is exactly equal to the 6.023 × 10²³ particles.

The term mole is defined as the amount of substance containing 6.023 × 10²³ molecules.

First multiply the number of moles supplied by Avogadro's Number to detect how many molecules there are.

Moles are determined from the molecular weight.

For FeF₃ molecule,

55.8 + 3⋅19 = 116g/mole

24 gram /  116g/mole

= 0.207 moles of  FeF₃

= 0.207 moles × 6.023 × 10²³

= 1.2 × 10²³ molecules

Thus, in 24 grams of FeF₃ molecule 1.2 × 10²³ molecules are present.

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The limiting reactant is H₂ because it has a lower yield. The correct option is A.

Limiting reactants in a reaction are the reactants that are used up in a given reaction in the presence of excess reactants.

Limiting reactants determine the amount of a product that can be formed in a reaction.

Limiting reactants result in the formation of the smallest amount of a product in a reaction.

Considering the given equation of reaction:

N₂ + 3 H₂ → 2 NH₃

The mole ratio of the reactants in the reaction is 1 : 3 for nitrogen and hydrogen.

10.1 g N₂ produces 0.72 moles NH₃.

1.2 g H₂ produces 0.39 moles NH₃.

The least amount of product that is formed is from hydrogen. Hence, hydrogen is the limiting reactant.

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Answer:

we have to find the number of moles of NH₃ formed by reaction of 2 moles of N₂ and 2 moles of H₂. ... ∴ 2 moles of hydrogen will give = 1.33 moles of ammonia. therefore the no of moles of ammonia after the reaction would be 1.33 moles

Answer:

The following are six of the most powerful hurricanes to make landfall on the mainland United States based on minimum pressure: - Florida Keys Labor Day hurricane, 1935, 892 mb The hurricane struck the Florida Keys as a Category 5, the highest ranking possible on the five-step Saffir-Simpson scale.

Explanation: