Which of these statements best explains why chemistry is flexible?

Considering the definition of ideal gas law, the amount of Ar present is 0.00702 moles.

An ideal gas is a set of atoms or molecules that move freely without interactions. The pressure exerted by the gas is due to the collisions of the molecules with the walls of the container. Ideal gas behavior occurs at low pressures. At high pressures the molecules interact and intermolecular forces cause the gas to deviate from ideality.

The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:

P×V = n×R×T

Where:

In this case, you know:

Replacing in the definition of ideal gas law:

1.4 atm× 0.155 L = n×0.086 (atmL)÷(molK)× 359 K

Solving:

[1.4 atm× 0.155 L] ÷ [0.086 (atmL)÷(molK)× 359 K]= n

0.00702 moles= n

Finally, there are 0.00702 moles of Ar.

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It is the 4th scenario is the dependent event. There are 7 gold tokens and 4 silver tokens in a cup. The first student randomly draws a gold token and keeps it. A second student randomly draws a gold token from the cup.

The fouth scenario is a dependent event because the probability of the second student drawing a gold token is affected by the outcome of the first student's draw.

If the first student draws a gold token, then there are only 6 gold tokens left in the cup, the probability changes. but  if the first student does not draw a gold token, then there are 7 gold tokens left in the cup, the probability will remain the same

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70.80 % is the mass percentage of bromine in the original compound.

Mass of AgBr = 0.6797 g

Moles of AgBr = 0.6797 g / 187.77 g/mol

= 0.0036198 mol

Silver Nitrate + Bromine --------->  Silver Bromide + Nitrate

According to reaction, 1 mole of AgBr is obtained from 1 mole of bromide ions , then 0.0036198 moles of AgBr will be formed from :

1/1 * 0.0036198  mol = 0.0036198 mole of bromide ions

Mass of 0.0036198 moles of bromide ions :

0.0036198 moles * 79.09 g/ mol

= 0.2862 g

Mass of the sample = 0.4042 g

Mass percentage = 0.2862 * 100 / 0.4041

Mass percentage (%) = 70.80 %

Hence, the mass percentage of bromine in the original compound is 70.80%

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Answer:

so I don't know how to answer that

Answer:

statement C is the correct answer

The calcium molecule undergoes oxidation while zinc molecule undergoes reduction during the redox reaction.

What is redox ?

It is a type of reaction in which there is an exchange of electron between two reactant species. During which one reactant under reduction and the other reactant undergoes oxidation.

Let the atoms in it ionic form-

\(Ca (s) + Zn^{2+} (aq)\) →  \(Zn (s) + Ca^{2+} (aq)\)

Oxidation :

\(Ca (s)\) → \(Ca^{2+} (aq) + 2e^{-}\)

Reduction :

\(Zn^{2+} (aq) + 2e^{-}\) → \(Zn (s)\)

Hence we can see that in the following redox reaction, calcium changes its oxidation state from 0 to +2 and zinc changes its oxidation state from +2 to 0 as it undergoes reduction.

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Answer:

CaCl2--->Ca2+ + 2Cl_ so i=3

Answer:

g. red, orange, yellow, blue

Explanation:

red is the hottest color and blue is the coolest. :)

Answer: A model would be useful because the model makes the concepts easier to understand.

Explanation:

Models are helpful tools in science education that can be used to enhance explanations, spark discussion, make predictions, provide visual representations of abstract concepts, and create mental models.

Answer:

spherical model of the universe

Starting with solid 3-sulfolene and then breaking it down was simpler than doing it with gaseous 1,3-butadiene. Maleic anhydride, a dienophile, reacts with the diene to produce 4-cyclohexene-cis-dicarboxylic anhydride.

A cyclic organic compound with a sulfone functional group is known as sulfolene or butadiene sulfone. It is a crystalline, odorless, white solid that can be stored forever and dissolves in various organic solvents as well as water. The substance is utilized as a butadiene source.

Sulfolane is a common industrial solvent that is used for cleaning natural gas and extracting aromatic hydrocarbons from hydrocarbon mixtures.

Sulfolane, a dipolar aprotic sulfone solvent, is comparable in physicochemical qualities to other dipolar aprotic solvents as DMSO, NMP, DMF, and DMAC. Sulfolane (anhydrous) has the highest freezing point and highest boiling point among the solvents in Table 1 at 28.4 °C.

Thus, solid 3-sulfolene and then breaking it down was simpler than doing it with gaseous 1,3-butadiene.

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Xeriscaping is a landscaping approach that focuses on conserving water by using drought-tolerant plants and efficient irrigation techniques. The goal is to create a visually appealing and sustainable garden while minimizing water usage.

Successful xeriscaping projects involve several key elements. Firstly, careful plant selection is crucial, opting for species that can thrive in arid conditions without excessive watering. Mulching is used to reduce evaporation and retain soil moisture.

Proper soil preparation, such as improving drainage and adding organic matter, promotes healthier plant growth. Efficient irrigation systems, like drip irrigation or soaker hoses, deliver water directly to plant roots, minimizing wastage.

Additionally, controlling erosion through the use of retaining walls or terracing is important. Lastly, regular maintenance, including appropriate pruning and weed control, ensures the longevity and vitality of the xeriscape garden. Overall, a successful xeriscaping project harmonizes sustainable practices with a beautiful outdoor environment.

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The statement is true that a molecule is composed of several functional groups.

A molecule is a group of two or more atoms held together by chemical bonds. Atoms can form chemical bonds by sharing electrons with other atoms, leading to the formation of stable molecules with unique chemical and physical properties. Molecules can be made up of atoms of the same element or different elements, and they can vary widely in size and complexity. In biology, many important molecules are made up of carbon, hydrogen, oxygen, nitrogen, and other elements, and they play critical roles in biological processes such as metabolism, cellular signaling, and genetic information storage and transmission. Examples of important biological molecules include DNA, RNA, proteins, carbohydrates, lipids, and many others. These molecules are responsible for carrying out the various functions of cells and organisms and are critical for life as we know it.

Here,

Many molecules in biology are composed of several functional groups, which are specific atoms or groups of atoms within the molecule that give it its chemical properties and reactivity. Examples of common functional groups in biological molecules include amino (-NH2), carboxyl (-COOH), hydroxyl (-OH), phosphate (-PO4), and methyl (-CH3) groups, among others. The presence of these functional groups can determine how a molecule interacts with other molecules in the cell and can influence its function and activity.

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The concentration of Fe\(^+2\) ions is 0.0088 M, and 29.33 L of K₂Cr₂O₇ is required for the titration.

Concentration of a titrand when volume is given can be calculated as,

M₁V₁=M₂V₂

Likewise volume of titrand can also be calculated by the same formula.

In the given problem, concentration of KMnO₄ =0.0216 M and it's volume=20.62 ml or 0.0206 L, volume of Fe\(^+2\) ions=50 ml or 0.05 L

substituting the values in the formula,

M₁=0.0216×0.0206/0.05=0.0088 M.

For calculating the volume of potassium dichromate using the same formula ,

V₂=0.0088×0.05/0.015=0.02933 ml or 29.33 L.

Thus, the concentration of iron(II) ions in sample is 0.0088 M and 29.33 L of 0.015 M potassium dichromate is used for doing the same titration.

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The enthalpy of combustion for 1kg of urea is -1223525.84 J/mol.

Urea is a compound that is used in fertilizers and in some plastics.The enthalpy of combustion for urea is the amount of energy that is released when urea is burned. In order to calculate the enthalpy of combustion for 1kg of urea, we need to use the information that is provided to us in the question. Let us start by writing down the balanced equation for the combustion of urea: CO(NH2)2 + 3/2 O2 → CO2 + 2H2O + N2
The balanced equation shows that 1 mole of urea reacts with 1.5 moles of oxygen gas to produce 1 mole of carbon dioxide, 2 moles of water, and 1 mole of nitrogen gas. The enthalpy change for this reaction is equal to the amount of energy that is released when 1 mole of urea is burned.
The heat of combustion (ΔHc) of urea is -632.6 kJ/mol. This means that 632.6 kJ of energy is released when 1 mole of urea is burned. We know that 12g of urea raised the temperature of water by 30°C. We can use this information to calculate the amount of energy that was released when 12g of urea was burned.
The specific heat capacity of water is 4.18 J/g°C. This means that it takes 4.18 J of energy to raise the temperature of 1 gram of water by 1°C. Therefore, it takes 4.18 x 1000 = 4180 J of energy to raise the temperature of 1 kg of water by 1°C.
We know that 12g of urea raised the temperature of water by 30°C. Therefore, the amount of energy that was released when 12g of urea was burned is:
Energy = mass x specific heat capacity x temperature change
Energy = 0.012 kg x 4180 J/kg°C x 30°C
Energy = 1497.6 J
We can now use this information to calculate the enthalpy of combustion for 1kg of urea:
Enthalpy of combustion = energy released / moles of urea burned
Enthalpy of combustion = 1497.6 J / (0.012 kg / 60.06 g/mol)
Enthalpy of combustion = - 1223525.84 J/mol
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Answer:

The correct answer is -

takes place in the Sun

plays a role in the production of essentially all elements heavier than helium

releases large amounts of energy

Explanation:

Fusion reaction takes place when two or more small atomic nuclei come in close proximation for a longer time so the nuclear force pulling them together and form into heavier molecules than helium and releases a huge amount of energy by this process.

A great example of this fusion reaction is the sun where nuclear fusion takes place inside the core of the sun and result in a huge amount of release as it is an exothermic reaction.

Answer:

Explanation

EDGE2021

Answer:

Hope this is what you were looking for.

Phenol reacts with dilute nitric acid at room temperature to give a mixture of 2-nitrophenol and 4-nitrophenol while with concentrated nitric acid, more nitro groups get substituted on the ring to give 2,4,6-trinitrophenol which is known as picric acid.

6.02 x \(10^{20\) formula units of MgCl₂ is equal to 0.1 moles of MgCl₂.

To convert formula units of MgCl₂ to moles of MgCl₂, we need to use Avogadro's number, which relates the number of formula units to the number of moles.

Avogadro's number (NA) is approximately 6.022 x 10^23 formula units per mole.

Given that we have 6.02 x 10^20 formula units of MgCl₂, we can set up a conversion factor to convert to moles:

(6.02 x 10^20 formula units MgCl₂) * (1 mol MgCl₂ / (6.022 x 10^23 formula units MgCl₂))

The formula units of MgCl₂ cancel out, and we are left with moles of MgCl₂:

(6.02 x 10^20) * (1 mol / 6.022 x 10^23) = 0.1 mol

Therefore, 6.02 x 10^20 formula units of MgCl₂ is equal to 0.1 moles of MgCl₂.

It's important to note that this conversion assumes that each formula unit of MgCl₂ represents one mole of MgCl₂. This is based on the stoichiometry of the compound, where there is one mole of MgCl₂ for every one formula unit.

Additionally, this conversion is valid for any substance, not just MgCl₂, as long as you know the value of Avogadro's number and the number of formula units or particles you have.

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Answer:

6

Explanation:

As , 2H2 + O2 = 2H2O

with 6 H2, 4O2 is excess.

H2O molecules formed = 6

Taking into account definition of percent yield, the percent yield for the reaction is 76.25%.

The percent yield is the ratio of the actual return to the theoretical return expressed as a percentage.

The percent yield is calculated as the experimental yield divided by the theoretical yield multiplied by 100%:

\(percent yield=\frac{actual yield}{theorical yield}x100\)

where the theoretical yield is the amount of product acquired through the complete conversion of all reagents in the final product, that is, it is the maximum amount of product that could be formed from the given amounts of reagents.

In this case, you know:

Replacing in the definition of percent yields:

\(percent yield=\frac{1.22 mol}{1.60 mol}x100\)

Solving:

percent yield= 76.25%

Finally, the percent yield for the reaction is 76.25%.

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Answer:

there is no shift in the state

Explanation:

The correct answer is - There is no shift in the state.

Reason -

If K > Q, a reaction will proceed forward, converting reactants into products.  If K < Q, the reaction will proceed in the reverse direction, converting products into reactants.  If Q = K then the system is already at equilibrium.

where Q, is the reaction Quotient

The uncertainty principle was discovered by Heisenberg. It states that ΔpΔx ≥ h where Δp is the uncertainty in knowing the momentum of the particle (momentum equals mass times velocity), Δx is the uncertainty in knowing the position of the particle, and h is Planck's constant (h=6.63×10⁻ ³⁴Js). If we know very precisely the position of the particle, we will not be able to know its speed so precisely and vice versa, regardless of how good our measuring device is.

So the answer is option d)

From the given data, the name of the hydrated salt would be  \(CoCl_2.83H_2O\).

The formula of the hydrated salt can be determined using the empirical formula approach. That is, we will find the mole equivalent of the anhydrous salt and the water of hydration and then combine them into a single formula after dividing by the smallest mole.

First, we need to determine the mass of the anhydrous salt and the water of hydration.

Mass of crucible (x) = 12.090 g

Mass of hydrated salt + crucible (y) = 16.250 g

Thus, the mass of the hydrated salt can be determined by subtracting x from y.

Mass of hydrated salt = 16.250 - 12.090 = 4.16 g

Mass of hydrate + crucible after evaporating off the water (z) = 12.424 g

Mass of anhydrous salt = z - x

                                      = 12.424 - 12.090

                                      = 0.334 g

Mass of water = 4.16 - 0.334

                        = 3.826 g

Now, let's find the moles:

Molar mass of \(CoCl_2\) = 129.839 g/mol

Molar mass of water = 18.01 g/mol

Mole of \(CoCl_2\) = 0.334/129.839 = 0.00257 mol

Mole of water = 3.826/18.01 = 0.2124 mol

Dividing through by the smallest mole

\(CoCl_2\) =  0.00257 / 0.00257  = 1

water = 0.2124/ 0.00257 = 83

Thus, the formula of the hydrate would be \(CoCl_2.83H_2O\)

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Answer: i think its A

Explanation:

Answer:

A

Explanation:

Becuase bubbles only come from chemical changes

Answer: I think the answer is 2.

Explanation:

Answer:

See the answer below

Explanation:

The formula for calculating power is such that;

  power = work/time

Two ways to restate the relationship between the 3 variables would be to make time and work the subject of the formula respectively.

1. When time if made the subject of the formula;

 time = work/time

2. When work is made the subject of the formula;

work = power x time

Answer:

Explanation:

Which of the following is most likely to be ductile?

a. Metal
b. Nonmetal
c. Metalloid
d. Gas

Answer: a. MetalMetal