What was the carbon cycle on the prairie like?

Answer:b

Explanation:the answer is b

Answer:

0.845mol NaCl

Explanation:

NaCl has a molar mass of 58.44g/mol.

49.3g/58.44g/mol = 0.845mol

Answer:

0.844

Explanation:

if you divide 49.3 by 58.44 it gives you 0.84360027 which you then round up to 0.844. I know my answer is correct cause I just took the test

Answer:

Nice experiment

Explanation:

Answer:

Propane

Explanation:

When a thermal energy is applied to a container of gas the volume of the gas will increase

Heating a gas makes its atoms and molecules move faster and that way increases the kinetic energy of the particles causing the gas expansion and the increase of its volume and pressure.

Otherwise when the thermal energy is removed, the atoms or molecules start to move slower and become denser until the substance condenses.

Common examples of  kinetic energy due to thermal energy are: rubbing the hands, baking in an oven, boiling water, when the seat of the car are heated.

It is the energy possessed by a body due to its relative motion. It is usually expressed in Joules (J).

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The Molality of the aqueous sodium acetate,NaC2H3O2 solution  is  0.298m.

Molality is defined as the amount of solute expressed in the number of moles present per kilogram of solvent. The units of molarity are mol/kg. The formula used to calculate molality is ,

Molality of the solution=moles of the solute /mass of the solvent

An aqueous sodium acetate solution is made by dissolving 0.185 mole NaC2H3 in 0.620 kg of water. here solvent is the water and solution is sodium acetate.

Moles of NaC2H3O2 = 0.185 mole

Mass of solvent  = 0.620 kg

putting all values in the expression of molality we get,

Molality of NaC2H3O2 = 0.185 mole / 0.620

                                        =0.298m

Hence, the molality of  solution is 0.298 m.

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Benzene is produced as a side product when water react with phenyl magnesium bromide during Grignard reactions.

The Grignard reaction  involves an R-Mg-X, a carbon chain bound to a magnesium halide, used to form alcohols  by attacking carbonyls such as in aldehydes or ketones.

Here R act as a nucleophile and Mg-X act as a electrophile. Instead of attacking carbonyl, which is  present in the reaction, the benzene ring will attack  water molecules present around, grabbing a H⁺ and pushing away MgBr .    

The required reaction is :

PhMgBr + H₂O → Ph-H + MgBrOH

Thus from the above conclusion we can say that it is always advised to use dry Grignard to avoid this reaction.

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Answer:

Nitrogen has 5 valence electrons

Explanation:

nitrogen has it's attoms form triple bonds which are very hard to break

so non-reactive

1. What is the state of matter of an ice cube ?

A) Solid

B) Liquid

C) Gas

2. What is the state of matter of water vapour ?

A) Solid

B) Liquid

C) Gas

If the absorbance of the 200 μm solution is 0. 885, then the absorbance of the 25μm is 0.221.

Absorbance (A) is also known by the optical density (OD).

Absorbance is the capacity of a solution to absorb quantity of light.

And Transmittance is the quantity of light which is passes through a solution.

As we know that,

Absorbance / Concentration = Constant

That means, absorbance is directly proportional to the concentration

Therefore,

0.885/ 200 μm = x / 25 ,

where,

x is the absorbance at 25μm.

Calculating all values, we get

X = 25( 0.885/ 200 ) = 0.221

Thus, we calculated that the absorbance of the 200 μm solution is 0. 885, then the absorbance of the 25μm is 0.221.

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Net ionic equation for the reaction when nickel(ii) sulfide and excess hydrochloric acid (aq) are combined will be Ni2S4 + 2HCl →NiCl2 + H2S.

In general ,Net ionic equation is defined as a chemical equation that represents only those elements, compounds, and ions that directly participate in the chemical reaction.

When their is a reaction between nickel sulfide and excess hydrochloric acid in aqueous state . Being less reactive Nickle cannot liberate the hydrogen gas . Nickle will react with a non-oxidizing acid (HCl) for releasing hydrogen gas which results in the formation of a nickel salt because it is present above hydrogen in the reactivity series.

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Acetone will be deprotonated completely by potassium tert-butoxide because potassium tert-butoxide is a strong base (non-nucleophilic and bulky).

Acetone (propanone) can be completely deprotonated by potassium tert-butoxide (KOtBu) under suitable conditions. The reaction mechanism involves the attack of the tert-butoxide anion on the acidic proton of acetone, forming an enolate intermediate that can further react with other electrophiles or undergo protonation. The use of a strong base like KOtBu favors the complete deprotonation of acetone and the formation of the corresponding enolate. However, the extent of deprotonation and the stability of the enolate may depend on factors such as temperature, solvent, and concentration of the reagents.

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The frequency of the photon that causes a transition from the n=4 state to the n=6 state in a hydrogen atom is determined by the difference in energy between the two states.

When an electron transitions between different energy levels in a hydrogen atom, it emits or absorbs photons with specific frequencies. The energy of a photon is directly proportional to its frequency, as described by the equation E = hf, where E is the energy, h is Planck's constant, and f is the frequency.

In this case, the transition is from the n=4 state to the n=6 state. The energy levels in a hydrogen atom are given by the equation E = -13.6 eV/n^2, where n represents the principal quantum number. Plugging in the values for the two states, we find that the energy difference between them is:

ΔE = E(n=6) - E(n=4)

   = (-13.6 eV/6^2) - (-13.6 eV/4^2)

   = -13.6 eV(1/36 - 1/16)

   = -13.6 eV(4 - 9)/144

   = -13.6 eV(-5)/144

   = 13.6 eV(5)/144

Now, to determine the frequency of the photon, we can convert the energy difference to joules using the conversion factor 1 eV = 1.6 x 10^-19 J:

ΔE (J) = (13.6 eV(5)/144)(1.6 x 10^-19 J/eV)

       = (13.6 x 5 x 1.6 x 10^-19) / 144 J

Finally, we can calculate the frequency of the photon using the equation E = hf:

f = ΔE (J) / h

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VSEPR (Valence Shell Electron Pair Repulsion) theory is a model used to predict the geometry of a molecule based on the number of electron pairs surrounding its central atom.

The central atom is the focus of the VSEPR theory, as the number and arrangement of electron pairs will determine the shape of the molecule. The electron pairs, both lone pairs and bonding pairs, repel each other, causing them to adopt an arrangement that maximizes the distance between them. This arrangement determines the overall shape of the molecule, and is based on the number of electron pairs around the central atom.

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Answer:

Its 1s22s22p63s23p1 ik it looks a lil goofy but i think its right

Explanation:

Answer:

1)

Stream of photons

2)Energy in atoms

3)Speed of 300,000 kilometers per second

4)Travel through vacuum of space

Explanation:

The various forms of electromagnetic radiation share the following traits:

flow of photons

The power of atoms

300,000 kilometres per second in speed

traverse the void of space

Hence, the appropriate responses are:

Stream of photons

Energy in atoms

Speed of 300,000 kilometers per second

Travel through vacuum of space

The proper order is Na > Mg > Si > P > Ar. As a result of the valence electrons' low nucleostatic attraction, sodium (Na) has the biggest atomic radius.

The electrons' orbitals get bigger and bigger as we go from top to bottom, increasing the atomic size.S and Ar are hence real. S is the largest element on the periodic table since it is on the left. Na has the most atoms of any of the other elements mentioned. Due to its position to the right of silicon, phosphorus will have a lower atomic radius for an uncharged atom than silicon. Due to its position to the right of silicon, phosphorus will have a lower atomic radius for an uncharged atom than silicon. The atomic radius grows in a group from top to bottom and decreases across a period, as seen in the figures below. The smallest element is therefore helium, whereas the largest is francium.

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The colors seen on the surface of gasoline are primarily the result of a phenomenon called thin-film interference. This occurs when light waves reflect off both the top and bottom surfaces of the thin gasoline layer, causing the reflected waves to interfere with each other.

The resulting chemical colors depend on the thickness of the gasoline film and the angle at which the light is observed.

The colors seen on the surface of gasoline are primarily the result of thin-film interference. When light enters the surface of gasoline, some of it is reflected off the top of the liquid, while some of it enters the liquid and reflects off the bottom surface of the liquid. These two waves of light can interfere with each other, causing some wavelengths of light to cancel out while others reinforce. This interference produces the characteristic rainbow-like colors seen on the surface of gasoline. The exact colors seen can depend on a variety of factors, including the thickness of the liquid, the angle of incidence of the light, and the composition of the gasoline.  

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In a synthesis reaction, 3.2 grams of magnesium combined with 12.0 grams of oxygen. The maximum amount of magnesium oxide that can be produced in this reaction is 5.33 grams,

The balanced chemical equation for the synthesis of magnesium oxide is 2 Mg + O2 → 2 MgO.

According to this equation, 2 moles of magnesium react with 1 mole of oxygen to produce 2 moles of magnesium oxide. To determine the maximum amount of magnesium oxide produced, the given masses of magnesium and oxygen are converted into moles using their respective molar masses.

The molar mass of magnesium (Mg) is approximately 24.31 g/mol, and the molar mass of oxygen (O2) is around 32.00 g/mol. By dividing the given mass of magnesium (3.2 grams) by its molar mass, we obtain approximately 0.132 moles of magnesium.

Similarly, dividing the given mass of oxygen (12.0 grams) by its molar mass, we obtain approximately 0.375 moles of oxygen. Since the ratio between magnesium and magnesium oxide is 1:1, the amount of magnesium oxide produced will be equal to the amount of magnesium used. Therefore, the maximum amount of magnesium oxide that can be produced during the reaction is approximately 0.132 moles. Converting this to grams using the molar mass of magnesium oxide (40.31 g/mol), we find that the maximum amount of magnesium oxide produced is approximately 5.33 grams.

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Answer:

In all of the ecoregions, wind and rain can weather and erode the landforms and soil. Rivers are also

powerful weathering and erosion agents. They can cut into rock and form canyons. When rivers deposit

eroded material, they change their shape or extend the shoreline. When waves along coastlines deposit

sediment, they extend beaches; when they wash sediment away, the waves erode beaches. Rivers, rock

formations, soils, topography, and precipitation in an ecoregion will determine how the processes of

weathering, erosion, and deposition work to reshape it.

Explanation:

Answer:

Calcium

Explanation:

The number of protons is the atomic number of the element. Number 20 on the periodic table is Calcium.

The variable that is unknown until the experiment is performed is the dependent variable.

In a scientific experiment, variables are classified into two main categories: independent variables and dependent variables. The independent variable is the variable that is intentionally manipulated or changed by the experimenter. It is under the control of the experimenter and is deliberately altered to observe its effect on the dependent variable.

On the other hand, the dependent variable is the variable that is measured or observed as the outcome or response in the experiment. It is the variable that is expected to change in response to the manipulation of the independent variable. The value or behavior of the dependent variable depends on the value or behavior of the independent variable.

Typically, before conducting an experiment, researchers have a hypothesis or an expectation about how the independent variable will affect the dependent variable. However, the actual outcome or result of the experiment, which is observed through the measurement of the dependent variable, remains unknown until the experiment is performed.

The purpose of conducting the experiment is to gather empirical data and observe the changes in the dependent variable to analyze the relationship between the independent and dependent variables.

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An acid base reaction always produces salt and water.

In neutralization reaction, an acid and a base react together to produce salt and water.

In this chemical reaction hydrogen ions (H+ ions) come form an acid while hydroxide ions (OH- ions) are released by a base which combine together to form water.

For example, let's take the reaction between sodium hydroxide and hydrochloric acid.

NaOH + HCl -------> NaCl + H2O

the above reaction produces sodium chloride salt and water.

Overall, it is a neutral reaction because no excess ions are left behind in the solution.

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halogens have 7

allali have 2

noble gases have 8

K = 1

P = -3

Ra= 7

Cl = -1

N = 5

O = 6

Answer:

i-  lol

Explanation:

yes

Answer:

34 fortnights

Explanation:

Convert months into weeks. Do this by multiplying the number of months with 4 because there are 4 weeks in a month.

17 x 4 = 68

There are 68 weeks in 17 months

A fortnight is 2 weeks. To find how many fortnights are in 68 weeks, divide 68 weeks by 2 weeks

68 / 2 = 34

There are 34 fortnights in 68 weeks or 17 months

Answer:

i think right artrium but not full aure

The concentrations of both mercury chloride and oxalate ion are 0.30 m,  the rate of the reaction is 7.8 × 10⁻⁴ M/s.

given that :

concentration of mercury chloride =  0.30 M

concentration of oxalate ion = 0.30 M

It can be written as:

2HgCl₂  +  C₂O₄²⁻   -----> 2Cl⁻  +  Hg₂Cl₂  +  2CO₂

k = 8.7 × 10⁻³ M⁻²/s⁻¹

The rate of the reaction will be shown as :

Rate = k [HgCl₂ ] [ C₂O₄²⁻ ]²

Rate =  8.7 × 10⁻³  (0.30)(0.30)²

Rate = 7.8 × 10⁻⁴ M/s

Thus, rate of the reaction will be  :

Rate = 7.8 × 10⁻⁴ M/s

This question is incomplete , the complete question is :

__""when the concentrations of both mercury chloride and oxalate ion are 0.30 m, what is the rate of the reaction? "__

the rate is given as : Rate = k[HgCl₂ ] [ C₂O₄²⁻ ]²  value of k = 8.7 × 10⁻³ M⁻²/s⁻¹__"

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