What is a spontaneous reaction?
OA. A reaction with a high activation energy
OB. A reaction that occurs without the addition of energy
OC. A reaction with a low activation energy
OD. A reaction that requires an input of energy to occur

Answer:

A) Warmer

Explanation:

it says above 0

77.094*[tex]10^{23}[/tex]  molecules are in 12.80 moles of strontium bydroxide.

The chemical strontium hydroxide has a molecular weight of 121.6324 g/mol and the molecular formula Sr(OH)2. It appears in the form of an anhydrate with prismatic, colorless crystals that are liquescent.

The building By counting the number of components (and their corresponding quantities) listed in the chemical formula, one can easily determine that each molecule of the compound NaOH contains three atoms.

By mole concept-

1moleof strontium bydroxide =6.023*[tex]10^{23}[/tex] molecules of strontium bydroxide.

so,

12.80 moles of strontium bydroxide =12.80*6.023*[tex]10^{23}[/tex]

No of molecule =77.094*[tex]10^{23}[/tex] molecule

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The electronic configuration of oxygen is k =2, L=6 the subshell configuration is 1s², 2s²,2p⁴. Similarly the configuration of sodium is 1s², 2s²,2p⁶,3s¹ and that for chlorine is 1s², 2s²,2p⁶,3s²,3p⁵.

The electronic configuration of an element is the distribution of electrons in different orbitals from the lowest energy level to the highest energy level.

Oxygen is 8th element thus having 8 electrons. The main shell configuration is K= 2, L= 6 and the subshell electronic configuration is 1s², 2s²,2p⁴.

Sodium is 11th element. The main shell electronic configuration is  K=2, L=8, M=1. Subshell electronic configuration is  1s², 2s²,2p⁶,3s¹ and the noble gas configuration is [Ne]3s¹. Where Ne have 10 electrons.

Chlorine is 17th element with main shell configuration K =2, L=8, M=7.Subshell configuration 1s², 2s²,2p⁶,3s²,3p⁵ and noble gas configuration is [Ne] 3s² 3p⁵.

Nitrogen is 7th element with K= 2, L=5 and subshells, 1s², 2s²,2p³.

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Answer:

cellular respiration occurs both in plant and animal cells.

Explanation:

Cellular respiration definitely occurs in animals, it is how we break down glucose to get ATP. Plants first use photosynthesis to produce glucose and then need a way to produce ATP, being cellular respiration.

Explanation:

[tex]density \: = \: mass \: over \: volume \\density \: 16grams \: over \: 7cm {}^{3} \\ density = 2.3g \cm {}^{3} [/tex]

Yes. The reaction is an addition reaction.

Addition reactions are reactions where 2 or more reactants combine to form a single product. Addition reactions are otherwise known as synthesis reactions because they often result in the synthesis of new molecules entirely.

Generally, addition reactions can be represented by the following equation:

A + B ---> AB

They are quite different from decomposition reactions in which a single product decomposes to form 2 or more products or substitution reactions in which an atom displaces another atom in a compound.

Thus, the reaction [tex]A_2 + C_3H_6 --- > C_3H_6A_2[/tex] is an addition reaction.

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The wavelength that is associated with the transition is  2145 nm.

We know that the wavelength can be obtained from the use of the Rydberg equation and we know that the Bohr's mode lets us know that an electron can move from from a higher to a lower energy level.

Let us write;

1/λ = RH(1/[tex]n_{2} ^2[/tex] - 1/[tex]n_{1} ^2[/tex])

λ = wavelength

RH = Rydberg constant

[tex]n_{1}[/tex] = initial level

[tex]n_{2}[/tex] = final level

Then;

1/λ = 1.097 * 10^7 (1/4^2 - 1/7^2)

1/λ = 1.097 * 10^7 ( 0.0625 - 0.020)

λ =  2145 nm

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The nuclear equation for this reaction shows the gamma rays that are released when cobalt-60 is produced. 5927Co+10n⟶6027Co+γ

What is nuclear reaction ?

In nuclear physics and chemistry, a nuclear reaction is the process by which two atomic nuclei or nuclei and external particles collide to produce one or more new nuclides. Therefore, a nuclear reaction must transform at least one nuclide into another nuclide. When a nucleus interacts with another nucleus or particle and they separate without changing the properties of the nuclide, this process is simply called a form of nuclear scattering and is not a nuclear reaction.

Although in principle two or more particles could react and collide, the probability of three or more nuclei colliding in the same place at the same time is much lower than for two nuclei, so such Incidents are very rare.

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Answer:

State : Gaseous state  Colour : Pale yellow  Odour : Irritating

Explanation:

At 25 degree celsius which is approximately known as the room temperature, Fluorine being the highest electronegative element has weak van der waal forces due to which the electrons are apart from each other. At a high enough temperature(room temp. in this case) that is higher than their boiling point, the fluorine atoms become gaseous particles. Hope you understood my explanation....Happy Learning:)

The statement " Inertia and distance combine to keep Earth in orbit around the Sun and the Moon in orbit around Earth " is false.

According to Sir Isaac Newton, he proposed and concluded in his investigation that the earth is being kept in its orbit around the Sun and the Moon in orbit around Earth by means of gravity and inertia. This is not done through inertia and distance.

In conclusion, it can be deduced from the explanation given above that inertia and gravity combine to keep the earth in orbit around the Sun and the Moon in orbit around Earth.

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The number of atoms of Oxygen in 7.23 moles of Fe(NO₃)₃ is 3.92 x 10²⁵.

Determine to total number of individual molecules of Fe(NO₃)₃ in 7.23 moles.

Use Avogadro's number for this: 1 mole = 6.02 x 10²³ molecules.

Thus, 7.23 moles of Fe(NO₃)₃ contains molecules,

7.23 x 6.02 x 10²³ = 4.35 x 10²⁴ molecules of Fe(NO₃)₃.

Determine how many oxygen atoms in one molecule of Fe(NO₃)₃. There are 3 Oxygen atoms in the nitrate NO₃, and 3 nitrate groups in Fe(NO₃)₃. Thus, number of oxygen atoms in Fe(NO₃)₃ is,

3 x 3 = 9 Oxygen atoms in 1 molecule of Fe(NO₃)₃.

Finally, multiply the number of O atoms in 1 molecule of Fe(NO₃)₃ by the total number of Fe(NO₃)₃ molecules.

9 x 4.35 x 10²⁴ = 3.92 x 10²⁵ total Oxygen atoms.

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The empirical formula of compound is C₃H₇O₃. The molecular formula is 1, 2, 3, tri hydroxyl propane.

What is molecular formula ?

The molecular formula is an equation that specifies how many atoms of each element there are in a single compound's molecule. It displays the precise amount of atoms present in a molecule.

Propane, for instance, has the chemical formula C4H10. The given compound has a formula of 4 carbon atoms and 10 hydrogen atoms.

The empirical  formula of compound is C₃H₇O₃.

Then, ( 12 × 3 ) + ( 1 × 7 ) + ( 16 × 3 )

= 36 + 7 + 48

= 91

( 39.6 ) + ( 7.75 ) = 47.35

91 - 47.35

= 43.65

Thus, molecular formula of given compound is 1, 2, 3, tri hydroxyl propane.

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The ratio of Fe²+: Fe³+ in Fe3O4 is 1:2

What is ore?

An ore is a naturally occurring deposit of geologic material (rock) that contains a sufficient quantity of one or more valuable elements or compounds to be economically mined. Metals such as copper, platinum, iron, lead, gold, silver, aluminium, nickel, and others are among these valuable elements. Nonmetals such as silicon and diamond may be found in ore. These valuable chemicals can be extracted and used in a variety of ways, from jewellery creation to electronic gadget manufacture. Ores vary greatly based on the parent rock's chemical composition as well as the natural mechanism by which they were created.

Mining corporations carefully analyse various issues before deciding to mine because extracting anything from the earth involves time, money, and effort. The ore grade, for example, indicates how much of the desired precious element or combination occurs inside the parent rock. The rock is regarded an ore if the required component is present in sufficient concentration for processing to be viable. Larger grade ores have higher concentrations of the desired ingredient, and vice versa.

Fe304 contains both Fe²+ and Fe³+

Then we have to deduce the ratio of Fe²+ and Fe³+.

We know that

Fe0  + Fe2O3 ---------> Fe3O4

Fe in Fe0 is Fe(II)

Fe in Fe2O3 is Fe(III)

Then we have see that

on combine Fe 2+ with Fe3  , Fe304 is form

Hence,

The ratio of Fe²+: Fe³+ in Fe3O4 is 1:2

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The final temperature (°C) of the air at this elevation is 326.3K.

The temperature of a gas can be calculated using the combined gas law equation as follows:

P₁V₁/T₁ = P₂V₂/T₂

Where;

According to this question, 1.20L weather balloon on the ground has a temperature of 25.0°C and is at atmospheric pressure (1.00 atm). When it rises to an elevation where the pressure is 0.730 atm, then the new volume is 1.80L. The final temperature can be calculated thus:

1 × 1.2/298 = 0.730 × 1.8/T₂

0.004027T = 1.314

T = 326.3K

Therefore, 326.3K is the final temperature of the balloon.

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Answer:

b

Explanation:

erhqjh

The concentration in mmol/L of the chemist's mercury(I) chloride solution. is 2.03 × 10^-8 M

We are given;

Number of moles of mercury (i) chloride as 0.000406 μmol

Volume is 200 mL

We are required to calculate the concentration of the solution.

We need to know that;

Concentration is also known as molarity is given by;

Molarity = Number of moles ÷ Volume

Number of moles = 4.06 × 10^-10 Moles

Volume = 0.02 L

Therefore;

Concentration = 4.06 × 10^-10 Moles ÷ 0.02L

                      = 2.03 × 10^-8 M

Thus, the molarity of the solution is 2.03× 10^-8 M.

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Taking into account the definition of Avogadro's Number, 4.33656×10²⁵ molecules are in 72 moles of CO₂.

Avogadro's Number is called the number of particles that make up a substance (usually atoms or molecules). This particles can be found in the amount of one mole of said substance.

Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.

Then you can apply the following rule of three: if 1 mole of CO₂ contains 6.023×10²³ molecules, 72 moles of CO₂ contains how many molecules?

amount of molecules of CO₂= (6.023×10²³ molecules × 72 mole)÷ 1 mole

amount of molecules of CO₂= 4.33656×10²⁵ molecules

Finally, 4.33656×10²⁵ molecules are present in 72 moles of CO₂.

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One mole of CS₂ and two moles of H₂S are formed as products and 3 moles of CH₄ are leftover.

A limiting reagent is a reactant that is fully exhausted from the reaction mixture at the completion of a  reaction. The limiting reactant will decide the maximum amount of product.

Given, a balanced chemical equation of the reaction between methane and sulphur is:

[tex]CH_4 + 4S\longrightarrow CS_2 +2H_2S[/tex]

Given, the number of moles of the sulphur = 4

The number of moles of methane = 4

From the chemical reaction, one mole of methane reacts with four moles of sulphur. Therefore, four moles of sulphur fully react with one mole of methane and three moles of methane leftover.

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The combined mass of the dog and the basket is equal to 5.71 Kg.

Work can be described as the energy used when applying a force to move an object through a definite displacement.

The work done by a force to move an object through a displacement can be represented as:

W = F.dcosθ

Where θ is angle between displacement and force.

Given, the height the basket lifted up, d = 1.4 m

The angle between force and displacement, θ = 0°

Thus, the work done when lifting the basket is:

W = F d cosθ

W = mg.d cosθ

W = mg.d cos0°

m = W/gd

m = 221/(9.8).(3.95)

m = 5.71 Kg

Therefore, the mass of the basket and dog is equal to 5.71 Kg.

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A close-up photograph must be taken by the prosecutor to demonstrate the position of the body in relation to the rest of the crime scene.

For criminal investigation analysis, it becomes important to capture photographs from those areas in which acts of violence took place. To record the crime scene in more detail the photograph must be taken from close range and also with perfection. Close range photographs enables the viewer to understand where and how the crime was committed. The photographs of entry and exit of the crime scene is taken so carefully to observe the movement of the criminal before and after of the crime.

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Answer:  C

Explanation:

Mole measure the number of elementary entities of a given substance that are present in a given sample. One mole of iron (ii) sulphate were reacted during the experiment.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

The balanced equation is

FeSO[tex]_4[/tex](aq) + 2 NaOH (aq) [tex]\rightarrow[/tex] Fe (OH)[tex]_2[/tex] + Na [tex]_2[/tex] SO [tex]_4[/tex]

Stoichiometry, thet is written in the front of molecule or compound represents the number of moles of that compound. One mole of iron (ii) sulphate were reacted during the experiment.

Therefore, One mole of iron (ii) sulphate were reacted during the experiment.

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The number of Joules in 6,458 Calories calculated to the correct number of significant figures would be 2.6790 x [tex]10^4[/tex] Joules.

Both Joules (J) and Calories (Cal) are units of energy. According to the standard unit of conversion:

1 kiloCalorie = 4148 Joules

Since, 1 kiloCalorie = 1000 Calorie

Then:

1000 Calorie = 4148 Joules

Thus;

1 Calorie = 4148/1000

               = 4.148 Joules

Now, let's see the number of Joules that is equivalent to 6,458 Calories.

1 Calorie = 4.148 Joules

6,458 Calories = 4.148 x 6,458

                         = 26787.784 Joules

According to one of the rules guiding significant figures when performing multiplication operations, the number with the lowest significant figure is considered for the significant figures of the final answer.

Thus, the final answer, in this case, would be to four significant figures.

In other words, 6,458 Calories = 2.6790 x [tex]10^4[/tex] Joules.

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X-rays and gamma rays have frequencies higher than microwaves but lower than UV radiation.

X-rays and gamma rays are both types of electromagnetic radiation. They are similar in that they are both invisible, travel at the speed of light, and can penetrate human tissue. They differ in their wavelength and energy. X-rays have a shorter wavelength and higher energy than gamma rays

Gamma rays are a type of electromagnetic radiation. They are the most energetic form of electromagnetic radiation. Gamma rays are produced by the most energetic events in the universe, such as supernova explosions and the merging of neutron stars.

X-rays are used in medicine and dentistry because they can penetrate the human body, which Gamma rays cannot.

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Each Hydrogen atom has 1 valence electron. Since Hydrogen can only fit a max of 2 valence electrons in its orbital, each Hydrogen atom only needs 1 electron. Each atom has 1 valence electron, so they can just share, giving each atom two electrons each.

In this compound, there would be five proton NMR signals,

We know that the acronym NMR means nuclear magnetic resonance. It has to do with the kind of spectrum in which the kind of chemical environment where the proton is found would impact the spectrum that is observed in the compound.

The first thing that we need to look at and find out in the image is to be able to find out the number of chemical environments that we have in the compound as we can see it in the image.

By studying the compound closely, we can see that there are four different proton chemical environments that we can be able to see and map out from the compound and it is these chemical environments that tell us the number of signals to expect.

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The concentration terms are molality, normality and mole fraction. Molarity can be used to find out the ionic strength of any solution. Therefore, the mass of CH[tex]_2[/tex]O is 4.80g.

Molarity can be calculated by dividing number of moles of solute by volume of solution in liter. Molarity is affected by temperature. Its unit is mole/liter. It measure the concentration of any solute in a solution.

Mathematically,

Molarity= number of moles of solute÷ Volume of solution in liter

number of moles of solute =given mass÷ Molar mass of solute

number of moles of solute =mass÷30.03 g/mol

Molarity=0.314 M

Volume of solution=0.505 liters

Substituting all the given values, we get

0.314 M= {mass÷30.03 g/mol}÷ 0.505 liters

mass÷30.03 g/mol=0.15

mass =4.80g

Therefore, the mass of CH[tex]_2[/tex]O is 4.80g.

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If if a reaction that should theoretically yield 20 g of a product has a 45% yield, The actual yield of product is 9g.

Using this formula to find  the actual yield of product

Actual yield of product = Actual yield × Theoretically yield

Where:

Actual yield  = 45% or 0.45

Theoretically yield = 20g

Let plug in  the formula

Actual yield  = 0.45 × 20g

Actual yield= 9g

Therefore the actual yield is 9g.

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Taking into account definition of percent yield, the actual yield of the product is 9 g.

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= (actual yield÷ theoretical yield)× 100%

where:

In this case, you know:

Replacing in the definition of percent yield:

45%= (actual yield÷ 20 g)× 100%

45%÷100%= actual yield÷ 20 g

0.45= actual yield÷ 20 g

0.45×20 g= actual yield

9 g= actual yield

Finally, the actual yield is 9 g.

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Answer: The answer would be C i think

Explanation:

2 NH3 + 3 CuO → 3 Cu + N₂ + H₂O in the equation the compounds that are on the left side were reactants and the compounds on the right side was products.

what is reactants and products?

Chemical reactions form and dissolve the chemical bonds that hold atoms together to form molecules. During a chemical reaction, the atoms are re organized; they become disengaged and reattached to one another in various ways, resulting in new compounds with diverse characteristics. Every chemical reaction has two parts:

Reactants – The beginning elements of a chemical reaction; what enters into the reaction

Usually written on the left side of a chemical reaction

Products — What is produced as a result of a chemical reaction.

Usually written on the right side of a chemical reaction.

among the given options the false statement was

H20 is a reactant was the false statement.

but the H2O was actually a product.

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