plz, help me I'm so confused!

(this is also science)

The mass of the iron that is present in the sample is 1.76 g.

We know that we can be able to use the stoichiometry of the reaction so as to be able to obtain the mass of the iron that is used in the reaction. Now we have the the fact that;

Number of moles of the dichromate = 25/1000 * 0.021

= 0.00525 moles

If 6 moles of iron reacts 1 mole of the dichromate

x moles of iron reacts with 0.00525 moles of the dichromate

x =  6 moles  * 0.00525 moles /1 mole

= 0.0315 moles

Mass of the iron =  0.0315 moles * 56 g/mol

= 1.76 g

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Answer:

ZnCO3 solid reacts to form Zn0 solid plus CO2 gas

The concentration of the hydrochloric acid solution is 0.124M.

The concentration of a solution can be calculated using the molarity equation as follows:

CaVa = CbVb

Where;

According to this question, 50.0mL of a solution of hydrochloric acid (HCl) of unknown concentration reacts completely with 58.9 mL of 0.105 M sodium hydroxide (NaOH). The concentration of the hydrochloric acid can be calculated as follows:

50 × Ca = 58.9 × 0.105

50Ca = 6.185

Ca = 6.185/50

Ca = 0.124M

Therefore, 0.124M is the concentration of the hydrochloric acid solution.

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The second scientist must have introduced a catalyst to the reaction, opening up a new avenue for the reactant particles to engage in chemical reaction with a lower activation energy than the uncatalyzed reaction in the first chemist's trials.

The amount of a material in a certain area is referred to as concentration. A another way to think about concentration is as the proportion of a solution's solute to its entire solution or solvent.

In a concentrated solution, the solute is present in significant levels relative to the solvent. Orange juice, brine solution, and black tea are a few examples. A diluted solution is one that has a little amount of solute and a lot of solvent. Salted water is one illustration.

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The total number of electrons in p orbitals in a silver atom is 18.

The position of silver (Ag) in the fifth row of the periodic table, the 11th column of the periodic table, the 9th column of the transition metal, or the d block, determines the electron configuration for silver (Ag). The atomic number of silver is 47. Consequently, the final electron configuration for silver must be:

[tex]1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{2} 3d^{10} 4p^{6} 5s^{2} 4d^{9}[/tex]

Now, the total number of electrons in p orbitals are 18.

By changing the [tex]1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{2} 3d^{10} 4p^{6}[/tex] , either core notation or noble gas notation [Kr] can be used to write this notation. Then the configuration can be written as-

[tex][Kr] 5s^{2} 4d^{9}[/tex]

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More reactive metals will drive less reactive metals from out metal salt complexes. As a result, a new salt as well as the weaker metal are created.

Any of a group of materials known as metals that exhibit strong thermal and electrical conductivity as well as mutability, ductility, and high light reflection. Copper is an example of metal.

Metals have various properties, including strength, hardness, and stiffness. From a small paperclip to a huge airplane, metals may be melted and shaped in to something. They effectively conduct heat and electricity.

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The presence or absence of a double bond is not a difference in the pathways by which fatty acids are degraded and synthesized. Therefore, option B is correct.

A fatty acid is an aliphatic carboxylic acid having a saturated or unsaturated aliphatic chain. The majority of fatty acids that are found in nature contain an unbranched chain with an even number of carbon atoms, ranging from 4 to 28.

Triglycerides, cholesterol, and other critical fatty acids—what the medical community refers to as fats that the body cannot produce on its own—store energy, keep us warm, and safeguard our vital organs. They serve as messengers, facilitating the work that proteins do.

Thus, option B is correct.

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Any material listed in the cell notation that is not specifically oxidized or reduced is most likely an inert electrode.

When looking at the cell notation, any material that is not specifically indicated as either being oxidized or reduced is most likely an inert electrode. An inert electrode is a material that does not participate in the redox reactions taking place in the electrochemical cell. It is often used as a conductor to connect the anode and the cathode, but it does not take part in the reaction itself.

The other option, an active electrode, is a material that does participate in the redox reactions taking place in the electrochemical cell. This material can either be oxidized or reduced, depending on the circumstances. It is important to note that an active electrode is not always present in the cell notation.

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The solution is a. CH3COOH as the acid and base conjugation in the reaction between ammonia and acetic acid −.

In the given chemical equation, acetic acid acts because the acid even as ammonia acts because the base.

The given chemical equation is an acid-base response. Specifically, it's miles an acid-base response among acetic acid and ammonia. In an acid-base response, it's miles crucial to factor out which chemical species are the acid, base, conjugate acid, and conjugate base. In the problem, it most effective desires to pick out the acid reactant and the conjugate base product.

Basically, the acetic acid donates a Hydrogen ion to ammonia to supply the ammonium ion. With this mechanism, we will classify acetic acid as an acid. The conjugate base of the response is the product this is derived from the acid reactant. In this state of affairs wherein acetic acid is the acid reactant, the conjugate base can be the acetate ion. The conjugate base has nearly a comparable chemical method to the acid. It is simply one much less Hydrogen atom as compared to acid. Therefore, the acid reactant is the acetic acid even as the conjugate base reactant is the acetate.

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Answer:

NH3 + HCH3COO --> CH3COO- + NH4+

NH3: base

HCH3COO: acid

CH3COO: conjugate base

NH4+: conjugate acid

Explanation:

We know acetic acid is an acid so that makes ammonia base. An acid donates a proton/,hydrogen so acetic acid will lose a hydrogen and become the conjugate base. Bases gain a proton and become conjugate acids.

V = Adx, or alternatively Ady, where A denotes the usual disc's area and r = f(x) or f(y), depending on the axis of revolution. 2. The volume of the solid produced by a region under f(y) (to the left of f(y)) limited by the y-axis, the horizontal lines y=c and y=d, and rotating around the y-axis.

= πr2h 3.

V = dc[f(y)]2dy can be used to determine the volume of a solid that has been rotated about the y-axis.

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Answer:

Chemical change

Explanation:

A chemical reaction is a process that leads to the chemical transformation of one set of chemical substances to another. Classically, chemical reactions encompass changes that only involve the positions of electrons in the forming and breaking of chemical bonds between atoms, with no change to the nuclei, and can often be described by a chemical equation. Nuclear chemistry is a sub-discipline of chemistry that involves the chemical reactions of unstable and radioactive elements where both electronic and nuclear changes can occur.

Answer:

Product

Explanation:

The amount of energy that is required to change 20.0 g of an unknown substance from -15.0 °C to 7.0 °C is q = +49.65 kJ.

Energy is the ability to do tasks. It can exist in various forms, including potential, kinetic, thermal, electrical, chemical, and nuclear.

At -15°c, it will be solid, to increase the amount of heat to raise

temp from -15°C to 40°C.

(20.0) (3.3J/g°c) x 15°C) = 330 J.

At -10°C, it is in which phase transformation takes place from sold to wound.

ΔHfue = 0.945 J/gx 20g = 18.93.

After that, it will be in want and it will be in liquid form 40°C.

To 7°C, then.

922 m Cgas 47

=(20g) (1455/g°c) (17)

493005.

Total Energy = q1 + ΔHfus  + q2

47 = 7.0°C - 10°C) = 14°C -

2 330J18.95 + 49300J

q = 49648.9 3. 9

q = +49.65 KJ

Therefore, the amount of energy is q = +49.65 KJ.

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(a) The greater interconnectivity of a chains causes the tensile strength to rise with molecular weight.(b) As chain bonding develops, tensile strength rises with the degree of crystallinity.(c) Tensile strength rises when a material is deformed by drawing because the chains realign, increasing overall bonding forces.(d) The concomitant increase is crystallinity and consequently greater bonding causes the tensile strength of the an underformed material to increase with annealing.

(A) As the molecular weight of a semicrystalline polymer grows, so does its tensile strength.Increased chain entanglements with higher molecular weights account for this phenomenon.

Since chlorine has a stronger bond with fluorine than fluorine does with oxygen, we would anticipate polychlorotrifluoroethylene to have higher tensile strength.

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The process by which the molecules of the gas can be able to move is the process of diffusion.

We know that according to the Graham's law, the rate of the diffusion  of the gas is inversely proportional to the molar mass of the gas. When we open the bottles, the molecules of the perfume would begin to move.

As the bottle is opened, the molecules would escape from the bottle and then be able to travel through the room and get to where you are by the principle of diffusion.

Hence, the movement of the perfume is according to the Graham's law of diffusion in gases.

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The product(s) in the reaction are: NaOH and H₂ (Option C)

Chemical equations are representations of chemical reactions. All chemical equations has two sides:

The reactants are located on the left side while the products are located on the right side as shown below:

Reactants —> Products

With the above information, we can obtain the products of the reaction given in the question above. This is shown below:

2Na(s ) + 2H₂O(I) → 2NaOH(aq) + H₂(g)

The products are NaOH and H₂

Thus, the correct answer to the question is: 2NaOH(aq) + H₂(g) (Option C)

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Based on the information provided, the element with successive ionization energies of 786.3 kJ/mol, 1,580 kJ/mol, 3,230 kJ/mol, 4,360 kJ/mol, 16,000 kJ/mol, and 20,000 kJ/mol is likely to be aluminum (c).

Ionization energy is the energy required to remove an electron from an atom or a positive ion. It is a measure of the atom's tendency to lose electrons and is generally higher for atoms with a smaller atomic radius and a higher positive charge on the nucleus.

The ionization energies of the elements in Period 3 (the third row of the periodic table) are generally as follows:

Sodium (a): 496.1 kJ/mol (1st), 4,562 kJ/mol (2nd)

Magnesium (b): 738.1 kJ/mol (1st), 1,450 kJ/mol (2nd), 7,646 kJ/mol (3rd)

Aluminum (c): 578.8 kJ/mol (1st), 1,180 kJ/mol (2nd), 2,980 kJ/mol (3rd), 4,180 kJ/mol (4th)

Silicon (d): 786.5 kJ/mol (1st), 1,551 kJ/mol (2nd), 3,217 kJ/mol (3rd), 4,336 kJ/mol (4th), 9,900 kJ/mol (5th)

Phosphorus (e): 1,045 kJ/mol (1st), 2,079 kJ/mol (2nd), 3,169 kJ/mol (3rd), 6,491 kJ/mol (4th)

Sulfur (f): 1,112 kJ/mol (1st), 2,077 kJ/mol (2nd), 3,281 kJ/mol (3rd), 4,535 kJ/mol (4th)

Chlorine (g): 1,257 kJ/mol (1st), 2,362 kJ/mol (2nd), 3,595 kJ/mol (3rd), 4,906 kJ/mol (4th)

Argon (h): 1,521 kJ/mol (1st)

As you can see, the ionization energies of aluminum (c) are the closest match to the values given in the question. Therefore, the element is likely to be aluminum.

This allowed for exact replication. Genetic material has to be a stable molecule in order to be handed down from one generation to the next.

The study of how genes and characteristics are handed down from one generation to the next is known as genetics. Our health, looks, and even personality are all influenced by the information in our DNA! It all starts with genetics.

The study of genes is called genetics. From one generation to the next, our genes transmit information. The reason one child has blonde hair like their mother while their sibling has dark hair like their father, for instance, is genetic.

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The ratio of the atoms of the iridium and the platinum is; 8.86 : 1. Option B

We know that the atom is the smallest particle of the substances that can be able to take part in a chemical reaction. We know that in the platinum and the iridium, we both have atoms in the substances and now we would want to get the number of atoms that is in each of the elements.

Number of moles of iridium = 100g/192 g/mol = 0.52 moles

Number of moles of platinum = 900g/195 g/mol= 4.6 moles

Number of atoms in the iridium atom = 0.52 moles * 6.02 * 10^23 atoms

= 1.2 * 10^23 atoms

Number of atoms of platinum = 4.6 moles * 6.02 * 10^23 atoms

= 2.7  * 10^24 atoms

Since we have about 100g of the iridium and about 900 g of the platinum, then we have the that the ratio of the atoms of the elements is;

2.7  * 10^24 atoms:  1.2 * 10^23 atoms

= 8.86 : 1

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Pure iron is not so strong to use in construction field. Addition of carbon make iron more strong and less brittle.

The useful form of iron made by incorporating carbon and traces of other metals is called cast iron. Pure form of iron is not strong enough to be useful and it is brittle.

Steel does become stronger and more durable when carbon is added to iron, but only to a certain extent. It will then grow stronger but less resilient (ie like cast iron).

Iron is made stronger by carbon by altering its crystal lattice. In terms of effect, this distortion is comparable to work hardening. Sadly, it is a very complicated impact that depends on how the steel is heat treated and precisely how much carbon is applied. Not all metals are subject to this.

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The balancing of chemical equations is based on the law of conservation of mass.

How could a chemical process be made to balance out? Which integers can be changed, and which cannot?

When an equation is balanced, the coefficients can only be changed (the numbers in front of molecules or atoms).

The coefficients are indicated by the numerals in front of the molecule. Subscripts are the smaller numerals found following atoms. These cannot be changed while balancing chemical equations!

How is a chemical equation brought to equilibrium?

the algebraic balancing technique. Chemical equations can be balanced by assigning algebraic variables as stoichiometric coefficients to each species in the unbalanced chemical equation.

Equations in mathematics are used to calculate the values of each of these variables

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Explanation:

The value of [H+] can be calculated using the concentration of the HCl solution and the balanced chemical equation for the dissociation of HCl in water:

HCl (aq) + H2O (l) → H3O+ (aq) + Cl- (aq)

The concentration of HCl is 3.65 g / (36.5 g/mol) = 0.1 M

The concentration of H+ ions in the solution can be calculated using the concentration of HCl and the stoichiometry of the dissociation reaction:

[H+] = 0.1 M x (1 mol H+ / 1 mol HCl) = 0.1 M

To show that [OH-] is 1.00 x 10-12 M, we can use the relationship between [H+] and [OH-] in aqueous solutions, which is given by the ion product constant for water (Kw):

Kw = [H+] [OH-] = 1.00 x 10-14

Substituting the value of [H+] that we calculated above, we can solve for [OH-]:

[OH-] = Kw / [H+] = (1.00 x 10-14) / (0.1 M) = 1.00 x 10-12 M

Therefore, the concentration of OH- ions in the solution is 1.00 x 10-12 M.

A synthesis reaction is a type of chemical reaction in which two or more reactants combine to form a new compound or product.

In a synthesis reaction, atoms from the reactants are rearranged to form a new chemical structure, with the total number of atoms remaining the same.

Identifying the starting material or reactant, as well as the desired end product or target molecule.

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The  mass in grams of aluminum iodide that is required to yield an actual amount of 80.25 grams of aluminum is 1407.89 grams

Let x represent the number of grams of aluminum iodide required to yield 73.75 grams of aluminum.  

The charge on each aluminum ion is +3 while the charge on each iodide ion is -1. The empirical formula for aluminum iodide would be AH₃.

The relative atomic mass of aluminum and iodine on a modern periodic table is:

Al =26.982.

I =  126.904.

Therefore number of moles, n =  mass, m / molar mass, M

molar mass of AH₃, M = 410.694

n = ( x / 410.694)

The number of grams of aluminum would be

mass = number of moles * molar mass

mass =  (26.982 / 410.694)x g

Hence, the actual yield of aluminum would be:

Actual yield = percentage yield * theoretical yield

where:

theoretical yield = (26.982/410.694)x g

Actual yield = (26.982/410.694)x *  86.8%

Actual yield = 0.057x g

Since the actual yield is 80.25 g

0.057x g = 80.25

x = 1407.89 grams

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All amino acids have the same amino, carboxyl, and carbon groups; the only characteristic that makes an amino acid different is the R-group.

There is a basic structure shared by all amino acids. A hydrogen atom, an R-group, or side-chain group, a basic amino group, a carboxylic acid group, and a central carbon atom are all connected to one another by a molecule. What differentiates amino acids is their R-group.

An amino acid is encoded by a codon, a triplet of nucleotides. An amino acid is encoded by each trio of nucleotides.

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The melting point of francium was thought to be around 8.0 °C (46.4 °F); Additionally, 27 °C (81 °F) is frequently encountered. Due to its radioactivity and extreme rarity, the element's melting point is unknown. 20  1.5 °C (68.0  2.7 °F) was the result of a different extrapolation based on Dmitri Mendeleev's method.

There are additional electron shells as you move down any group—for instance, Lithium has two shells and Francium has seven—that result in electron shielding. The force of attraction diminishes as it travels further through these shells to the outermost one, resulting in less powerful bonding.

The weaker each metallic bond becomes, the lower the melting and boiling points become. The iotas in a metal are kept intact by the fascination of the cores to electrons which are delocalized over the entire metal mass.

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GAS A, Graham's law states that the rate of effusion of a gas is inversely proportional to the square root of its molar mass or that the rate of effusion of two gases = square root of the inverse of their molar masses.

PV = nRT, where P is pressure (in atm), V is the volume (in L), n is the number of moles of gas, R is the universal gas constant (0.08206 Latm/molK), and T is temperature, is the formula used to calculate the molar mass (in K).

By dividing the mass of one mole of ammonia by the aforementioned volume, the density can now be computed. This density is somewhat lower than the ammonia density at the STP, which is equivalent to (170.4g/mol)(22.4L/mol)=0.761g/L.

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Answer:

the answer is a

Explanation:

A

because if u add

Compared to trial 1, trial 2, reactant molecule collisions occur more frequently.

If the two molecules A and B are to interact, they must get close enough to each other that some of their current bonds will be broken and space will be left for any new bonds that will be required for the end products to form. A collision is the name given to such a meeting.

The collision theory postulates that the molecules of reactants are hard spheres, and that reactions can only take place when these spheres (molecules) clash with one another.

According to the collision theory, for a reaction to take place, the particles involved must collide the proper way around (with the correct orientation) and with sufficient force to cause the bonds between the reactants to be broken.

The complete question is : 2NO(g)+2H2(g)→N2(g)+2H2O(g)

The information in the data table above represents two different trials for an experiment to study the rate of the reaction between NO(g) and H2(g), as represented by the balanced equation above the table. Which of the following statements provides the correct explanation for why the initial rate of formation of N2 is greater in trial 2 than in trial 1 ? Assume that each trial is carried out at the same constant temperature.

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An enzyme known as a kinase is responsible for protein phosphate group attachment.An enzyme called a phosphatase takes a phosphate group out of a protein. Complete answer is below the picture.

Enzymes that catalyze the transfer or phosphate between its substrates include protein kinases and phosphatases.A protein phosphatase catalyzes the transfer of phosphate from the a phosphoprotein to the a water molecule, whereas a protein kinase catalyzes the transfer of -phosphate form ATP (or GTP) towards its protein substrates.

As a result of the hydrolysis of adenosine triphosphate (ATP) and the enzymatic action of kinase, the protein acquires a phosphate group.This is the mechanism that underlies the development of post-translational modifications (PTMs).Additionally, phosphatase activity makes phosphorylation a reversible process.

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