How can you model the cycling of matter in the Earth system?

Answer:

i think it is 1.27 x1024

Explanation:

i don't really know though

Answer:

(160/28+48)=(160/76)*6.022x10²³

1.267 x 10 ^ 24 is the total number of atoms

Answer:

A small amount of chemical splashes in Frank's eye. What should happen next? Frank should go to the eyewash station while his lab partner tells the teacher what happened.

Explanation:

Brainlist

According to the NOAA, the key messages in the Nevada State Climate Summary article form are:

The National Oceanic and Atmospheric Administration (NOAA) is a federal agency tasked with understandind and predicting changes in climate, weather, ocean, and coasts, as well as disseminating this information to the necessary bodies for action.

According to the NOAA, the key messages in the Nevada State Climate Summary article form are:

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Answer: 4

Explanation: because the zero doesn't count

Heat is added to ice at 0 °C. Explain why the temperature of the ice does not change. What does change?When heat is added to ice at 0°C, the temperature of the ice does not change. This happens because all the heat energy is used up in overcoming the intermolecular forces of attraction (hydrogen bonds) that exist between the water molecules in ice.

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The temperature increase from 20 °C to 46 °C indicates that the reaction between zinc and copper sulfate solution is exothermic, with heat being released into the surroundings.

In the given reaction between zinc and copper sulfate solution, the temperature change can provide insights into the type of heat change occurring during the reaction. Based on the provided information, the initial temperature of the copper sulfate solution was 20 °C, and the final temperature of the mixture after the reaction was 46 °C.

The temperature increase observed in this reaction indicates an exothermic heat change. An exothermic reaction releases heat energy into the surroundings, resulting in a temperature rise. In this case, the reaction between zinc and copper sulfate solution is exothermic because the final temperature is higher than the initial temperature.

During the reaction, zinc displaces copper from copper sulfate to form zinc sulfate and copper metal. This displacement reaction is known as a single displacement or redox reaction. Zinc is more reactive than copper and therefore replaces copper in the compound.

The formation of new chemical bonds during the reaction releases energy in the form of heat. This energy is transferred to the surroundings, leading to an increase in temperature. The heat released is greater than the heat absorbed, resulting in a net increase in temperature.

The exothermic nature of this reaction can be explained by the difference in bond energies between the reactants and products. The breaking of bonds in the reactants requires energy input, while the formation of new bonds in the products releases energy.

In this case, the energy released during the formation of zinc sulfate and copper metal is greater than the energy required to break the bonds in copper sulfate and zinc.

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Answer:

?????/????

Explanation:

your answer is A 1000%

Answer:

dude this this ain't the ans of this question but the 1 u asked me in the comments and I m not able to find that question so this is that questions answer ok

Answer:

received 2 electrons

Explanation:

Since a neutrally charged oxygen has 8 electrons (-) and 8 protons (+), an oxygen ion with a charge of -2 and would have 10 electrons.

Answer:

1. 24.3x - 4

2. 389x

3. 11.7x - 2

4. 50x - 3

5. 725.781 x

Explanation: Hope it helped!

ΔLatticeU = ΔLatticeH – pΔVm is the lattice energy of wurtzite.  Ionic compounds often have flat surfaces that meet at distinctive angles and are stiff, brittle, crystalline materials.

Remember that when a metal reacts with a nonmetal, often an ionic compound results from the transfer of electrons form the metal (the reductant) towards the nonmetal (the oxidant). Ionic compounds often have flat surfaces that meet at distinctive angles and are stiff, brittle, crystalline materials. They melt at rather high temperatures and are not easily distorted.   ΔLatticeU = ΔLatticeH – pΔVm is the lattice energy of wurtzite.

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Answer:

Change in temperature (Δt) = 18.18°C (Approx.)

Explanation:

Given:

Mass of metal block (M) = 55g

Specific heat of metal (c) = 0.45 J/g°C

Amount of energy added (Q) = 450 J

Find:

Change in temperature (Δt)

Computation:

Using Specific Heat Energy formula

Q = McΔt

450 = (55)(0.45)(Δt)

450 = (24.75)(Δt)

Change in temperature (Δt) = 450 / 24.75

Change in temperature (Δt) = 18.18°C (Approx.)

Answer:

The volume of the flask is 20.245 litres .

Explanation:

We are given with following information-

\(PV=nRT\) -------- 1

where R =\(0.0821L.atom/mole.K\)

Molar mass of \(PCl_5=208.22g/mole\)

The given chemical equation is -

\(2P _(_s_)+5Cl_2 _(_g_)\rightarrow2PCl_5 _(_s_)\) --------- 2

Now , calculation -

Mass of \(PCl_5\) formed = 118g

Molar mass of \(PCl_5\) = \(208.22g/mole\)

      Mole = \(\frac{mass (g)}{molar mass}\)

Therefore , moles of \(PCl_5\) formed = \(\frac{118}{208.22}\)

     From equation 2 , we get to know that ,

 2mole \(PCl_5\) formed from 5 mole \(Cl_2 _(_g_)\)

Therefore , \(\frac{118}{208.22}\) mole \(PCl_5\) formed from \(\frac{5}{2} \times\frac{118}{208.22}\) mole \(Cl_2 _(_g_)\)

Moles of \(Cl_2 _(_g_)\) used =\(\frac{5\times118}{2\times208.22} mole\)

R= \(0.0821L.atom/mole.K\)

Pressure (P)= 1.85atm

Temperature (T)= 322K

Moles of  \(Cl_2 _(_g_)\) (n)= \(\frac{5}{2} \times\frac{118}{208.22}\) moles

Applying  the formula above in 1 equation , that is

PV = nRT

putting the given values -

\(1.85 \times V=\frac{5}{2} \times\frac{118}{208.22}\times0.0821\times322\)

 V = 20.245 litres.

Hence , the volume of the flask is 20.245 litres .

Answer:

sharp clever bright

Explanation:

s

Answer:

will you friend me please

The true statement is that the concentrations of reactants and products remain constant chemical equilibrium is achieved.

Equilibrium is a condition where no change in the system of the reaction takes place.

If we represent a chemical reaction in the equilibrium state as:

A + B ⇄ C + D

Where, A & B are reactants and C & D are products and at the equilibrium condition concentration of reactant as well as of products remain constant which is dedicated by double headed arrow.

Hence in equilibrium concentration of reactants as well as of products are constant.

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A compound is a substance made up of 2 or more elements

Answer: 45. 78 g  is formed in 16 minutes.

Explanation:

Let \(A_{o} =40 g\) and \(B_{o} =50 g\)

we know that \(\alpha =A_{o}\frac{M+N}{M}\, and \, \beta =B_{o}\frac{M+N}{N}\)

According to the question to create \(x\) part of the chemical C we will need 2 part of A and one part of B.

Therefore, M = 2 and N = 1.

Now, we can easily solve  for the value of α and β.

\(\alpha =40\frac{2+1}{2}=60\\\\\, and \, \beta =50\frac{2+1}{1}=150\)

Now, the differential equation must be: \(\frac{dX}{dt}=k\left ( \alpha -X \right )\left ( \beta -X \right )\)

I separate the variable and solve the equation

\(\int \frac{dx}{\left ( 60-x \right )\left ( 150-x \right )}=\int k\, dt\)

\(ln\frac{150-x}{60-x}=90kt+C_{1}\)

By using \(X(0) =0\),

\(\frac{150-x}{60-x}=Ce^{90k_{o}},C=\frac{5}{2}\)

and using \(X (8)=25\) and solving for the value of 'k'

\(\Rightarrow \frac{150-25}{60-25}=\frac{5}{2}e^{450k}\\\\\Rightarrow 3.6\times \frac{2}{5}=e^{450k}\\\\\Rightarrow 1.4=e^{450k}\)

Taking 'ln' both side, we get

\(\Rightarrow k=7.4716\times 10^{-4}\)

We obtain:\(X(t)=\frac{60Ce^{90kt}-150}{Ce^{90kt}-1}\)

Now, for the 16 min

\(\Rightarrow X(16)=\frac{150e^{1.07559}-150}{2.5e^{1.0759}-1}\)

\(\Rightarrow X(16)=\frac{439.7583-150}{7.3293-1}\\\\\Rightarrow X(16)=\frac{289.7583}{6.3293}\)

\(\Rightarrow X(16)=45.78 g\)

The partial charges on each fluorine atom are negative. Option B) The central O atom is the correct answer. Option B

The partial charges in a molecule are determined by the electronegativity values of the atoms involved. Electronegativity is the ability of an atom to attract electrons towards itself in a chemical bond. In the case of \(F_2O\), fluorine (F) is more electronegative than oxygen.

Fluorine is the most electronegative element on the periodic table, meaning it has a high ability to attract electrons. Oxygen is also relatively electronegative but less so than fluorine. When fluorine atoms bond with oxygen, the shared electrons will be pulled more towards the fluorine atoms, creating a polar covalent bond.

In \(F_2O\), each fluorine atom will pull the shared electrons towards itself, resulting in a higher electron density around the fluorine atoms. This creates a region of partial negative charge around the fluorine atoms.

Conversely, the oxygen atom will have a region of lower electron density and, therefore, a partial positive charge. This is because the shared electrons spend more time around the fluorine atoms due to their higher electronegativity.

Option B

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Answer: Yes

Explanation:  A single fixed pulley is a first class lever or a type 1 lever, The axle of the pulley is the fulcrum and the two sides of the pulley are the input arm and output arm.

The number of dots corresponds to the number of valence electrons an atom has. Therefore, the correct answer is: the number of valence electrons an atom has.

An atom's electron dot diagram shows the number of valence electrons that an atom has. Valence electrons are the outermost electrons of an atom and are involved in chemical bonding. In the electron dot diagram, the valence electrons are represented as dots around the symbol of the element.

An electron dot diagram, also known as a Lewis dot diagram, is a representation of an atom's valence electrons using dots around the symbol of the element.

The valence electrons are the electrons in the outermost energy level, also known as the valence shell, of an atom. These electrons determine the chemical behavior of an atom, as they are involved in chemical bonding and chemical reactions.

In an electron dot diagram, the valence electrons of an atom are represented as dots around the element symbol. Each dot represents one valence electron.

For example, a helium atom has two electrons in its only shell, so its electron dot diagram would consist of two dots around the He symbol. A carbon atom has four valence electrons, so its electron dot diagram would consist of four dots around the C symbol.

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depends on the situation, but scientifically, Einstein's theory of special relativity sets the speed of light, 186,000 miles per second (300 million meters per second). But some scientists are exploring the possibility that this cosmic speed limit changes. The speed of light is constant, or so textbooks say. (google)

The reactant mole ratio for all reactions discovered using this method must be met in order to apply this method to other reactions. Furthermore, the reactant molar ratios for each reaction must be known in order to determine the mole ratio in which the principal reactants react.

To adjust the reaction temperature, water was added to reaction mixtures A through E. In this experiment, KCr,O- was chosen as the source of dichromate ions because it is a strong oxidising agent that is easily converted into dichromate ions.The mole ratio is the ratio of the mole amounts of any two compounds in an equitable chemical reaction. The balance chemical equation compares the ratios of the molecules required to complete the reaction. It calculates how much of one substance is required to produce a certain amount of another substance using the mole ratios between the different parts of the reaction.

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Answer:

The dependent variable would be the whitening of the teeth of the participants.

Explanation:

Answer:

ok, here is your answer

Explanation:

AI-generated answer

To find the mass of oxygen that reacted, we need to use the Law of Conservation of Mass, which states that in a chemical reaction, the mass of the reactants equals the mass of the products.

First, we need to find the number of moles of hydrogen that reacted:

Molar mass of hydrogen (H₂) = 2.016 g/mol

Number of moles of H₂ = mass/molar mass = 46.2 g/2.016 g/mol = 22.92 mol

Next, we need to use the balanced chemical equation to find the number of moles of water produced:

hydrogen + oxygen → water

2H₂ + O₂ → 2H₂O

From the equation, we can see that for every 2 moles of H₂, 1 mole of O₂ is required to produce 2 moles of H₂O. Therefore, the number of moles of O₂ required to produce 22.92 moles of H₂O is:

Number of moles of O₂ = 1/2 x 22.92 mol = 11.46 mol

Finally, we can find the mass of oxygen that reacted by using its molar mass:

Molar mass of oxygen (O₂) = 32.00 g/mol

Mass of oxygen = number of moles x molar mass = 11.46 mol x 32.00 g/mol = 366.72 g

Therefore, the mass of oxygen that reacted is 366.72 g.

Answer: B.) -12.4

Explanation: This is because the sign of heat transfer is determined by the system's perspective. In this case, the system is releasing heat to the surroundings, which means that heat is flowing out of the system, making the heat transfer negative. The magnitude of the heat transfer is 12.4 J.