Calculate the percent mass/mass of a solution that contains 3 g of circles and 75 g of distilled water.

The true statements about catalysts are the statement 1,2 and 3.

1. Catalysts increase the rate of reaction: Catalysts facilitate chemical reactions by providing an alternative reaction pathway with lower activation energy. They enhance the rate of the reaction without being consumed in the process.

2. Catalysts behave as reactants in the reaction mixture: Catalysts participate in the reaction by interacting with the reactants. They form temporary bonds with the reactant molecules, leading to the formation of an intermediate complex that ultimately results in the desired products.

3. Catalysts decrease the activation energy of a reaction: Catalysts lower the energy barrier required for a reaction to occur by providing an alternative pathway with a lower activation energy. This enables the reactants to overcome the energy barrier more easily, thus increasing the reaction rate.

4. Catalysts show no physical change at the end of the reaction: Catalysts are not consumed or permanently altered in the reaction. They remain chemically unchanged and are available to participate in subsequent reaction cycles.

The statement "Catalysts are required in large concentrations in a reaction" is false. Catalysts work effectively even in small concentrations, as their role is to facilitate the reaction rather than being directly involved in the stoichiometry of the reaction.

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Answer:

\(\boxed{From \ +6 \ to \ 0}\)

Explanation:

2 Fe2O3(s) + 3 C(s) → 4 Fe(s) + 3 CO2(g)

In the given reaction, Iron in the reactants side have the oxidation number of +6. This is because \(O_{3}\) with \(Fe_{2}O_{3}\) has oxidation state -6, So any atom with it would have an oxidation state of +6 to give the resultant of zero.

In the products side, Iron acts as a free element reacting with no other atom. So, as per the rule of oxidation states, the oxidation state of Iron in the products side will be zero.

So, the oxidation number changes from +6 to 0 .

Extra Info: Decrease in oxidation state is Reduction , So Iron is being reduced here.

The change in the oxidation number of the iron atom in the reaction is from +3 to 0

Oxidation is simply defined as the the loss of electron. However, Oxidation number simply talks about the number of electrons that is either gained or lossed during bond formation.

The change in the oxidation number of iron in the reaction can be obtained as follow:

2Fe₂O₃(s) + 3C(s) → 4Fe(s) + 3CO₂(g)

Oxidation number of Fe₂O₃ = 0 (ground state)

Oxidation number of oxygen = –2

Fe₂O₃ = 0

2Fe + 3O = 0

2Fe + 3(–2) = 0

2Fe – 6 = 0

Collect like term

2Fe = 6

Divide both side by 2

Fe = 6/2

Thus, the oxidation number of Fe in Fe₂O₃ is +3

Therefore, the change in the oxidation number of the iron, Fe, atom in the reaction is from +3 to 0

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Answer:

None of these

Explanation:

A crystal structure refers to a regular, unique pattern if atom arrangement that characterizes a particular solid material. A crystal structure comprises of a unit cell, the unit cell refers to a regular arrangement of atoms in a particular pattern; this pattern is periodically repeated in the three dimensional structure of the lattice.

Many substances in nature such as minerals, metals, covalent network solid macromolecules and ionic substances are arranged in crystal structures. All the substance categories listen among the options possess definite crystal structures arranged in unit cells. None of them is a noncrystalline substance, hence the answer above.

Rutherford's results declined the results of Thomson's model, the correct option is C.

Atomic Models are the scientific theories proposed to determine the structure of an atom.

There are mainly 5 theories proposed for atomic models.

1. John Dalton's Atomic Model: An atom is the basic building block of all physical entities in the universe.

2. Plum Pudding Model, created by J.J. Thomson, uses the comparison of plum pudding, where the positive charge is uniformly dispersed throughout and the negative charge is randomly sprinkled on top, to explain how subatomic particles are structured.

3. Rutherford's model: proved the presence of a nucleus.

4.Niel Bohr's model: Arrangement of electrons in shells.

5. Erwin Schrodinger's model is also called as Quantum Model.

In J.J. Thomson's model, the equal distribution of positive and negative charges is proposed while,

Rutherford's theory declines this arrangement and proposes that the positively charged nucleus occupies a very small part and there is empty space in the atom.

So, Rutherford’s results suggested that the model proposed by Thomson was based on false research and required.

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Answer:

the answer is copper pipe

We can see here that the best fuel is the one that produces the most heat per unit mass. In this case, the fuel that produces the most heat per unit mass is methanol.

Fuel is a substance that is used to produce energy through combustion or other chemical reactions. It is commonly utilized to power various forms of transportation, generate heat or electricity, and operate machinery and appliances.

The results of the experiment are shown below:

Fuel            Mass (g)      Heat produced (J)       Heat per gram (J/g)

Methanol 1.0                          350                   350

Ethanol         1.0                          250                   250

Propane         1.0                          200                   200

Butane         1.0                          150                            150

Pentane         1.0                          100                            100

It is important to note that the results of this experiment are only a measure of the heat produced by the fuels.

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Answer:

3.4027x10^-22

Explanation:

Numbers are placed before the elements and molecules in a chemical equation so as to balance the equation so that it has the same number of atoms of each element on each side and s denoted as option B.

This is referred to as a symbolic representation of a chemical reaction and it contains the reactants and products in it thereby providing more information.

It has numbers in front of them so as to make the equation balance as the number of atoms of elements on the reactant side must be equal to that on the product side.

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Answer:So you come here in this question we have one 015 MI knew his solution. So this one is added two different types of solutions we have to calculate the volume of and you wish that should be added to given solutions. So if you see here 25 ml of 2.430 M It's cl solution so and is reacting with his cl to give you any cl plus two. Okay, so M one V one is equal to M two V two. So we want everyone 30 is equal to M one M two V two developed by a man then it is equal do M two is 25 ml 2.430 divided by M one is 1.15. Okay then it is equal to 59.85 ml of any U. S should be added to this one. Now the second solution, 25 ml of four 4.5 km H two S 04 solution. So here if you see the enemy would be reacted with H2 is so four means two moles is required. So hee too, Whoa plus any a two as well for so this one is also two more separate purchase so two months is required here so that's why anyone would even is equal to half weekend saying. So this one is equal to M1 We want we want that is equal to ah this is two multiplied away For going five am It is multiplied by 25 divided by 1.015 then we will get 20 221.67 ml of. And you will hitch. Okay, so this match is required here Now. The 3rd 1 is um 25 ml of one point fight in three people four. So here I had three people four plus any ohh so that is a need to and you three beautiful for bless H two. So here it is three months and this one is also three months three months. So we one is equal to three, multiplied by 1.5. Multiplied by 25 Ml liberated by 1.15. Then it is equal to 110.83 ml. Love. And you which is required added.

Explanation:

shelovesvoodoo on ig knows all

Answer:

a melting of lead Is the answer

In this first-order the decomposition reaction, the H2O2 concentration will drop from 6.80 M to 2 M in roughly 191.1 seconds.

The first-order rate equation can be used to calculate how long it will take for the hydrogen peroxide (H2O2) concentration to reach 2 M:

ln([H2O2]t/[H2O2]0) = -kt

Where:

The amount of H2O2 present at time t is known as [H2O2]t.H2O2 is initially present at a concentration of zero, and k is the rate constant.

To find t, we can rewrite the equation as follows:

t = -[ln([H2O2]t/[H2O2]0)] / k

Plugging in the given values:

[H2O2]t = 2 M

[H2O2]0 = 6.80 M

\(k = 6.40 \times 10^{(-3)} s^{(-1)\)

t = -[ln(2/6.80)] / (6.40 x 10^(-3))

Now, we can calculate the time:

t ≈ -[ln(0.2941)] / (6.40 x 10^(-3))

t ≈ -(−1.2231) / (6.40 x 10^(-3))

t ≈ 191.1 seconds

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The correct answer is that thermal energy is moving from your feet to your socks. The battery-heated socks work by using the heat generated by your body to warm your feet in cold weather.

The body produces heat, which is converted into thermal energy, and moves from your feet to the socks.

In order to warm your feet and make them more comfortable in cold weather, the socks use thermal energy. The thermal energy is only transferred in one direction, from your feet to the socks.

No more energy is produced because the battery-heated socks utilise your body's thermal energy to keep your feet warm.

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Answer:

630.95 grams of Na₂CO₃ would be needed to produce 1000g of NaHCO₃

Explanation:

The balanced reaction is:

Na₂CO₃ + CO₂+ H₂O → 2 NaHCO₃

By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of each compound participate in the reaction:

Being the molar mass:

Then by stoichiometry the following quantities of mass participate in the reaction:

You can apply the following rule of three: if 106 grams of Na₂CO₃ are needed to produce 168 grams of NaHCO₃, how much mass of Na₂CO₃ is necessary to produce 1000 grams of NaHCO₃?

\(mass of Na_{2} CO_{3}=\frac{1000grams ofNaHCO_{3} *106gramsofNa_{2} CO_{3} }{168grams ofNaHCO_{3}}\)

mass of Na₂CO₃= 630.95 grams

630.95 grams of Na₂CO₃ would be needed to produce 1000g of NaHCO₃

The word "symptom" refers to a specific manifestation or indication of a condition, disease, or disorder that is experienced or observed by an individual.

Symptoms are subjective or objective changes in the body's normal functioning that may be recognized as abnormal, uncomfortable, or problematic. Symptoms can manifest in various ways depending on the nature of the underlying condition. They can be physical, such as pain, rash, cough, fever, or fatigue, indicating an illness or injury affecting the body. Symptoms can also be psychological, such as anxiety, depression, or confusion, reflecting disturbances in mental health.

Symptoms serve as important clues for medical professionals to identify and diagnose diseases or disorders. They provide valuable information about the nature, severity, and progression of an illness, helping healthcare providers formulate appropriate treatment plans. Additionally, symptoms may also be important for individuals to self-assess their own health status and seek appropriate medical attention.

It is essential to note that symptoms alone may not provide a definitive diagnosis, as they can overlap across different conditions. Further evaluation, including medical tests and examinations, is often necessary to confirm a diagnosis and determine the appropriate course of action.

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CH3OH(g) —> CO(g) + 2 H2(g) The reaction takes place in a rigid, insulated vessel that is initially at 600 K. (B) The sum of the bond enthalpies of the bonds in the reactant is less than the sum of the bond enthalpies of the bonds in the products.

The term "bond enthalpies," which is also referred to as "bond energy," describes the strength and subsequently the stability of a chemical connection. The bond enthalpy of a chemical bond is the total energy required to dissolve 1 mole of that chemical bond. The single bond between oxygen and hydrogen, for instance, has a bond enthalpy of 463 kJ/mol. This means that a total energy of 463 kilojoules must be used to break a mole of hydrogen-oxygen single bonds. The fact that a chemical bond breaking process is always endothermic must constantly be kept in mind (because energy must be supplied to the molecule in order to break the chemical bonds that constitute it). As a result, whenever a chemical bond breaks, there is a positive enthalpy shift (H > 0). The creation of a chemical bond, on the other hand, is virtually invariably an endothermic process. There will be a negative enthalpy shift under these circumstances. The "mean bond enthalpy" or "average bond enthalpy" refers to the strength of a single bond within a molecule.

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Answer:

Exothermic Reaction/ Combination Reaction

Explanation:

It is a combination reaction and the nature of the reaction is exothermic.  

Element w is less reactive than elements x, y, and z. The element with the lower atomic number is typically less reactive.

Element w has an atomic number of 9, element x has an atomic number of 10, element y has an atomic number of 11, and element z has an atomic number of 12. Based on this information, we can conclude that element w is less reactive than elements x, y, and z.

This is because the reactivity of an element is largely determined by the number of valence electrons it has. Valence electrons are the electrons in the outermost shell of an atom that are involved in chemical reactions. Elements with fewer valence electrons are less reactive because they are more stable. Element w has only one valence electron, while elements x, y, and z have two, three, and four valence electrons, respectively.

In general, elements with a full outermost shell of electrons, such as the noble gases, are the least reactive because they are highly stable. Elements that are close to having a full outermost shell, such as element w, are also relatively stable and less reactive. On the other hand, elements with only a few valence electrons, such as the alkali metals, are highly reactive because they are trying to gain or lose electrons in order to achieve a full outermost shell.

Overall, the reactivity of an element is determined by its electronic structure, with elements having fewer valence electrons generally being less reactive than those with more. In the case of the elements w, x, y, and z, we can see that element w has the fewest valence electrons and is therefore the least reactive.

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Answer:

#1 Atom

Oxygen

Charge neutral atom

#2 ion

Oxide ( oxygen anion)

Charge 2-

Formula O2-

#3 Atom

Flourine

Neutral atom no charge

#4 atom

Flourine

Neutral atom no charge

#5 ion

Sulphide

Charge 2-

S2-

#6 ion

Chloride Cl-

Charge -1

#7 atom

Chlorine

No Charge neutral

#8 ion

Calcium ion cation

Charge 2+

Ca++

#9 atom

Hydrogen (protium)

No charge neutral

#10 atom

Hydrogen (deutrium)

No charge neutral

#11 ion

Proton H+

Charge +1

#12 atom

Helium

No charge neutral atom

Explanation:

To find charge we need difference in proton and electron if proton are equal to electron then this is neutral atom

If electron are more this is negative charge ion

For example in oxygen 8 proton and 10 electron its charge is negative 2

If proton are more this is positive charge ion

For example in calcium 20 proton and 18 electron positive ion is formed.

According to the picture, the name of each element along with its charge and chemical symbol is as follows:

A chemical element may be defined as the characteristics of atoms that possess a given number of protons in their nuclei, along with the number of neutrons including the pure substance typically consisting only of that species.

Therefore, according to the picture, the name of each element along with its charge and chemical symbol is well mentioned above.

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Answer:

Helium and neon

Explanation:

Answer:

I need to see the chapter lol /:

Answer:

1: background sound.

2: room tone

3: middle-frequency

4: Feedback

5: lapel mic

6: line level

7: High impedance

Answer:

23.A 100.0 mL sample of 0.10 M Ca(OH)2 is titrated with 0.10 M HBr. Determine the pH of the solution before the addition of any HBr. 24. Determine the pH of the solution after the addition of 100.0 mL HBr. 25. Determine the pH of the solution after the addition of 200.0 mL HBr. 26. Determine the pH of the solution after the addition of 300.0 mL HBr. 27. Determine the pH of the solution after the addition of 400.0 mL HBr.

Explanation:

The speed of the proton is 2.50 x 10⁵ m/s.

Given that a proton in a linear accelerator has a de Broglie wavelength of 159 pm.

The de Broglie wavelength equation is given byλ = h/pwhereλ is the wavelengthh is the Planck's constantp is the momentum of the protonRearranging the above equation to solve for the momentum of the proton,

we havep = h/λSubstituting the value of the wavelength given in the question into the above equation we get:

p = 6.626 x 10⁻³⁴ Js/ (159 x 10⁻¹² m)p = 4.17 x 10⁻²² kgm/s.

The speed of the proton can be calculated using the relation between momentum and speed. The momentum of a proton can be expressed asp = mv .

where p is momentumm is the mass of the protonv is the velocity of the proton.

Rearranging the above equation, we have v = p/m .

Substituting the values of momentum and mass of the proton,

we havev = 4.17 x 10⁻²² kgm/s / 1.67 x 10⁻²⁷ kgv = 2.50 x 10⁵ m/s.

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Quantatative is when a number of something changes, and we could sometimes visualize it, but qualitative is different.

Hope this helps

kenny

:D

Martensite : A Supersaturated interstitial solid solution of carbon in Alpha iron.

Marten a solid carbon interstitial solution in iron.

It is a steel metastable phase that results from austenite's transformation at temperature below 320 °C.

A body-centered tetragonal lattice characterizes martensite, an interstitial super saturated solution of carbon in iron.

It is extremely hard and brittle with a carbon concentration of up to 2%.

Its structure is acicular or needle-like and it is the result of rapid cooling (quenching).

The degree of martensitic transformation-achieved hardness is closely related to the rate of cooling and the percentage of carbon in steel.

So, Martensite is an interstitial supersaturated solid carbon solution in alpha iron.

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Answer:  C

Explanation:

Nuclear reactions involve a change in an atom's nucleus, usually producing a different element. Chemical reactions, on the other hand, involve only a rearrangement of electrons and do not involve changes in the nuclei.

Answer:

will you help us with that one please

The masses of dimethylamine and dimethylammonium chloride we need to prepare 8. 00 l of pH = 12. 00 buffer is 905 gm.

A buffer solution is defined as an acid or a base aqueous solution consisting of a mixture of a weak acid and its conjugate base, or vice versa whose pH changes very little when a small amount of a strong acid or base is added to it.

For above given information, the dimethylamine (CH₃)₂NH and dimethylammonium chloride (CH₃)₂NH * HCl are mixed to prepare a buffer solution

The concentration of the components is given as 0.5M , Volume = 5L

No. of moles = CV = 0.5 * 5 =2.5 moles

2.5 moles of dimethylamine = mass/ Molecular weight

Molecular weight of dimethylamine = 45 gm

Therefore the mass of dimethylamine required = 45 * 2.5 = 112.5gm

4 moles of dimethylammonium chloride = 362 gm

Therefore the mass of dimethylammonium chloride required = 362*2.5 = 905 gm

Thus, the masses of dimethylamine and dimethylammonium chloride we need to prepare 8. 00 l of pH = 12. 00 buffer is 905 gm.

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Ratio of moles of NH₃ produced to moles of N₂ used: 2 moles of NH₃ / 1 mole of N₂

Ratio of moles of NH₃ produced to moles of H₂ used: 2 moles of NH₃ / 3 moles of H₂

From the balanced chemical equation:

N₂ + 3 H₂ ⟶ 2 NH₃

We can determine the ratio of moles of products to the moles of each reactant.

Ratio of moles of NH₃ produced to moles of N₂ used:

From the balanced equation, we can see that 1 mole of N₂ reacts to produce 2 moles of NH₃. Therefore, the ratio is:

2 moles of NH₃ / 1 mole of N₂

Ratio of moles of NH₃ produced to moles of H₂ used:

From the balanced equation, we can see that 3 moles of H₂ react to produce 2 moles of NH₃. Therefore, the ratio is:

2 moles of NH₃ / 3 moles of H₂

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Given the equation of reaction;

N₂ + 3 H₂ ---> 2 NH₃

Calculate the ratio of the moles of produced to the moles of each of the reactants used. (Write two separate ratios.)

Answer:

D.) their valence electrons are free-roaming

Explanation:

Metals tend to arrange themselves in crystalline structures once they form metallic bonds. The electrons around the positive nuclei are delocalized, and thus freely float within the structure. This is unique to metallic bonding.