For the following reaction, 14.1 grams of nitrogen monoxide are allowed to react with 4.85 grams of oxygen gas. nitrogen monoxide(g) + oxygen(g) nitrogen dioxide(g) What is the maximum mass of nitrogen dioxide that can be formed? grams What is the FORMULA for the limiting reagent? What mass of the excess reagent remains after the reaction is complete? grams

The pH of a solution that is 0.111 M in sodium formate (NaHCO2) and formic acid (HCO2H), with a Ka of formic acid of 1.77 × 10^-4, can be calculated using the following these steps:

1. Recognize that this is a buffer solution, as it contains both a weak acid (formic acid) and its conjugate base (sodium formate).

2. Use the Henderson-Hasselbalch equation for buffer solutions: pH = pKa + log([A-]/[HA]), where [A-] is the concentration of the conjugate base (sodium formate) and [HA] is the concentration of the weak acid (formic acid).

3. Calculate the pKa: pKa = -log(Ka) = -log(1.77 × 10^-4) ≈ 3.75

4. Substitute the values into the Henderson-Hasselbalch equation: pH = 3.75 + log(0.111/0.111)

5. Simplify: pH = 3.75 + log(1) = 3.75 + 0 = 3.75

The pH of the solution is approximately 3.75, which is not one of the given options. However, considering the given options, the closest answer is A) 3.387.

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Fe and O2 = 0 mol

Fe2O3 = 1 mol

Given

2 mol Fe

48 g O

Required

Fill BCA table

Solution

mol Oxygen :

= mass : MW O2

= 48 g : 32 g/mol

= 1.5 moles

Limiting reactants :

Fe : O2 = 2/4 : 1.5/3 = 0.5 : 0.5

Both reactants have completely reacted

mol Fe2O3 :

= 2/4 x mol Fe

= 2/4 x 2

= 1

BCA table

Reaction

             4Fe + 3O2 --> 2Fe2O3

Before   2          1.5            0

Change  2         1.5             1

After       0           0              1

Answer:

LiOH

Explanation:

Among the following LiOH or lithium hydroxide is a Arrhenius base as it increase hydroxide ion concentration of a substrate.

According to the Arrhenius concept, base is defined as a substance which yields hydroxyl ions on dissociation.These ions react with the hydrogen ions of acids to produce salt in an acid-base reaction.

Bases have a pH higher than seven as they yield hydroxyl ions on dissociation.They are soapy in touch and have a bitter taste.According to the Lowry-Bronsted concept, base is defined as a substance which accepts protons .Base react violently with acids to produce salts .Aqueous solutions of bases can be used to conduct electricity .They can also be used as indicators in acid-base titrations.

They are used in the manufacture of soaps,paper, bleaching powder.Calcium hydroxide ,a base is used to clean sulfur dioxide gas while magnesium hydroxide can be used as an antacid to cure acidity.

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we find the energy to be approximately \(3.41 * 10^-19\) Joules is the answer.

To calculate the wavelength of a photon with a frequency of 61.7 MHz, we can use the formula: wavelength = speed of light / frequency. The speed of light is approximately\(3 * 10^8\) meters per second.

Converting the frequency to Hz (\(1 MHz = 10^6 Hz\)), we have \(61.7 * 10^6\)Hz.

Plugging these values into the formula, we get: wavelength =\((3 * 10^8 m/s) / (61.7 * 10^6 Hz).\)

Simplifying, we find the wavelength to be approximately 4.862 meters.

Now, to calculate the energy of a photon with a wavelength of 582.8 nm, we can use the equation: energy = Planck's constant × speed of light / wavelength.

Planck's constant is approximately \(6.63 * 10^-34\) Joule-seconds.

Converting the wavelength to meters (\(1 nm = 10^-9 m\)), we have \(582.8 * 10^-9 m.\)

Plugging these values into the equation, we get: energy =\((6.63 * 10^-34J·s) * (3 * 10^8 m/s) / (582.8 * 10^-9 m).\)

Simplifying, we find the energy to be approximately \(3.41 * 10^-19\) Joules.

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Answer:

ORANGE WAIT NO IM COLOR BLIND

Explanation:

Answer:

Science Question: What will the combination of the resources I use to make this new chemical do to different living organisms and non-living organisms around an environment?

Non-Science Question: What should we call this new chemical?

Explanation:

I hope this helps! If you don't like these questions I've got a few more that may work to your liking! :)

The true statement for these substances is one of the elements must have multiple oxidation states and be in an intermediate oxidation state.

For a substance like MnO₂ to act as both an oxidizing and reducing agent, it must have an element with multiple oxidation states. In this case, manganese (Mn) has several possible oxidation states, including +2, +3, +4, +6, and +7. In MnO₂, manganese is in the +4 oxidation state, which is intermediate between its highest (+7) and lowest (+2) oxidation states.

This allows MnO₂ to either gain or lose electrons, enabling it to act as either an oxidizing or reducing agent depending on the specific reaction conditions.

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Answer:

Mesosphere. This layer extends from around 31 miles (50 km) above the Earth's surface to 53 miles (85 km). The gases, including the oxygen molecules, continue to become denser as one descends. As such, temperatures increase as one descends rising to about 5°F (-15°C) near the bottom of this layer.

Explanation:

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(a) Oxidation half-reaction: In an oxidation half-reaction, a species loses electrons and increases its oxidation state.

(b) Reduction half-reaction: In a reduction half-reaction, a species gains electrons and decreases its oxidation state.

(c) Standard cell potential: The standard cell potential, or electromotive force, of an electrochemical cell is the difference in electrode potentials between the two half-cells under standard conditions. It is a measure of the driving force for the reaction to occur.

Ag+(aq) + Fe(aq) --> Ag3+(aq) + Fe3+(aq)

(a) Fe --> Fe3+ + 3e-

(b) Ag+ + e- --> Ag

(c) E°cell = E°reduction + E°oxidation = 0.80 V + (-0.44 V) = 0.36 V

Br-(aq) + Hg22+(aq) --> Br2(l) + Hg(l)

(a) Hg22+ + 2e- --> Hg(l)

(b) 2Br- --> Br2 + 2e-

(c) E°cell = E°reduction + E°oxidation = 0.79 V + (-0.85 V) = -0.06 V

Be(s) + Au3+(aq) --> Be2+(aq) + Au+(aq)

(a) Au3+ + 3e- --> Au+

(b) Be --> Be2+ + 2e-

(c) E°cell = E°reduction + E°oxidation = 1.68 V + (-1.85 V) = -0.17 V

Ac and Bi: Sorry, there is no given reaction for this system.

Ni and Cd: Sorry, there is no given reaction for this system.

Ce and Cr:

(a) Cr --> Cr3+ + 3e-

(b) Ce4+ + e- --> Ce3+

(c) E°cell = E°reduction + E°oxidation = 1.61 V + (-1.44 V) = 0.17 V

Note: The values given for the standard reduction potentials (E°reduction) are taken from standard reference tables at 25°C and 1 atm pressure.

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The work function of the metal is 3.41 * 10^-19 J.

We know that term work function has to do withy the energy that you have to supply so that you can be able to remove an electron from an atom. In this case we are looking at the work function of the atom that is called cesium.

Thus we have;

E = hc/λ

E= energy of the light

h = Plank's constant

c = speed of light

λ = wavelength

Then we would have that the wavelength of the light is given in the question as  400 nm

E = 6.6 * 10^ -34 * 3 * 10^8/400 * 10^-9

E = 4.95 * 10^-19 J

We then have;

KE = E - Wo

KE = kinetic energy

E = energy of the photon

Wo = work function thus we have;

Wo = E - KE

Wo = 4.95 * 10^-19 J -  1.54 x 10‐19J

Wo =3.41 * 10^-19 J

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Answer:

1-Temporarily store food.

2-Contract and relax to mix and break down food.

3-Produce enzymes and other specialized cells to digest food

Answer:

When she rubs her hands together, it causes heat or friction

The total number of moles contained in 115 grams of C₂H5OH is 2.50 moles .

The term "mole" refers to the quantity of a substance that has the same amount of subatomic particles (ions, molecules, or atoms) as there are carbon atoms.

Atomic weight of carbon(C)= 12 gm

Atomic weight of Hydrogen (H)=1 gm

Atomic weight of oxygen (o)=16 gm

∴Molecula weight of C2H5OH =(12×2 + 1×6 + 16×1) gm

24 + 6 + 16 gm = 46 gm

∴ 46 gm of C2H5OH contains 1 mole

1 gm of C2H5OH contain = 1/46 moles

115 gm of C2H5OH contains = 115×1/46 moles

⇒2.5 moles

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Russia is a federation with a semi-presidential political system. The President is the head of state while the Prime Minister is the head of government. The Federal Assembly is a bicameral legislature that is made up of the State Duma (lower house) and the Federation Council (upper house).

The political system in Russia and the United States are different. In the US, it is a presidential system where the President is both the head of state and government, while in Russia, the President is the head of state while the Prime Minister is the head of government.

In the US, the Congress is made up of the Senate (upper house) and the House of Representatives (lower house) while in Russia, the Federal Assembly is made up of the State Duma (lower house) and the Federation Council (upper house).

The key distinguishing features between the political systems in Russia and the US include the role of the President, the structure of the legislature, and the nature of the judiciary. In Russia, the President has a lot of power and is able to appoint the Prime Minister and other members of the executive branch.

The judiciary is also less independent compared to that of the US. On the other hand, the US has a more balanced system of power between the three branches of government, with the judiciary being independent of the executive and legislative branches.

The strengths of the political system in Russia include a strong centralized government that is able to make quick decisions and a strong military. However, the lack of political pluralism and the weak judiciary system are key weaknesses of the system.

The US political system has a strong commitment to individual rights and democratic principles. However, the system is often characterized by gridlock and polarization between political parties, leading to slow decision-making and a lack of progress on important issues.

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The charge for an ion of an element that has an outer electron configuration of ns2np3 is -3.

To be in a stable state, electrons try to make a noble gas configuration. The noble gas configuration is ns2 or ns2np6. So electrons try to gain or lose electrons to become ions. Ions have a charge according to the number of electrons captured (negative charge) or released (positive charge). The charge for an ion with the electron configuration

Ions with a negative charge are anions while ions with a positive charge are cations.

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Answer: 45.038

Explanation: 2.016 H (2*1.008) + 15.999 O (1*15.999)

One mole of Zn weighs about 65.4 grams. Therefore, the mass equivalent to 2.5 moles is number of moles times the atomic mass that is 163.5 here.

Any substance containing 6.022 × 10²³ atoms is called one mole of that substance. This number is called Avogadro number. Thus one mole of any element contains Avogadro number of atoms.

The mass of one mole of the  element is called its atomic mass. Similarly the mass of one mole of a compound is called its molar mass. Zinc is a transition metal.

Atomic mass of Zn = 65.1 g

thus, mass of 2.5 mole of Zn = 65.1 ×  2.5  = 163.5 g.

Therefore, the mass of 2.5 moles of Zn is 163.5 g

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Answer:

0.574moles

Explanation:

Using the general gas equation;

PV = nRT

Where;

P = pressure (atm)

V = volume (Litres)

n = number of moles (mol)

R = gas law constant (0.0821 Latm/molK)

T = temperature (Kelvin)

According to the information provided in the question;

- Volume (V) = 12400mL = 12400/1000 = 12.4L

- Pressure (P) = 890mmHg = 890/760 = 1.17atm

- Temperature (T) = 35°C = 35 + 273 = 308K

Hence, using PV = nRT

n = PV/RT

n = 1.17 × 12.4 ÷ 0.0821 × 308

n = 14.508 ÷ 25.287

n = 0.574moles

Therefore, the number of moles of argon gas in the cylinder is 0.574moles

Answer:

Temperature, concentration, and particle size of the reactants affect the collision frequency and energy of collisions in a chemical reaction, as predicted by the collision theory.

Explanation:

According to the collision theory of chemical reactions, for a reaction to occur, reactant particles must collide with sufficient energy and proper orientation. The temperature, concentration, and particle size of the reactants can affect the likelihood and frequency of these collisions and therefore impact the reaction rate.

Overall, the collision theory of chemical reactions suggests that temperature, concentration, and particle size all play important roles in determining the rate of a chemical reaction. By controlling these factors, it is possible to manipulate the rate of a reaction to achieve desired results.

Answer:

Mohammad observed that his water boiled much more quickly than his isopropyl alcohol. His peer group suggested some experimental error that may caused this to happen. Which 2 experimental errors most likely caused the invalid data a. He could have mixed up the labels on the containers b. The heating vessel or hot plate was not at the same temperature c. His procedure was correct but tested a type of water that boils more quickly than isopropyl alcohol d. The boiling vessel might have been dirty so the solutions got mixed

Explanation:

The standard cell potential, E°(cell), for the given reaction is +0.23 V. To calculate the standard cell potential, E°(cell), for the given reaction, we need to use the reduction potentials of the half-reactions involved.

The half-reactions involved in the reaction are: \(Fe_{3+}\) (aq) + e- → \(Fe_{2+}\) (aq) (Reduction half-reaction), \(I_{2}\) (aq) + 2 e- → 2 I- (aq) (Oxidation half-reaction)

The reduction potential for \(Fe_{3+}\) (aq) + e- → \(Fe_{2+}\) (aq) is given as +0.77 V, and the reduction potential for \(I_{2}\) (aq) + 2 e- → 2 I- (aq) is given as +0.54 V.

To calculate E°(cell), we need to subtract the reduction potential of the oxidation half-reaction from the reduction potential of the reduction half-reaction.

E°(cell) = E°(reduction) - E°(oxidation) = (+0.77 V) - (+0.54 V) = +0.23 V. Therefore, the standard cell potential, E°(cell), for the given reaction is +0.23 V.

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Acidic and alkaline solutions

Acids

Acids form acidic solutions in water. Acids produce hydrogen ions, H+ in aqueous solution. For example:

HCl(aq) → H+(aq) + Cl-(aq)

Acidic solutions have pH values less than 7.

Alkalis

Alkalis form alkaline solutions in water. Alkalis produce hydroxide ions, OH- in aqueous solution. For example:

NaOH(aq) → Na+(aq) + OH-(aq)

Alkaline solutions have pH values greater than 7.

Neutral solutions

A neutral solution is neither acidic, nor alkaline. A neutral solution has a pH value of 7.

Indicators and the pH scale

The pH scale measures the acidity or alkalinity of a solution. The pH of a solution can be measured using a pH probe, or estimated using universal indicator and a colour chart.

They mix it with water and then add universal indicator to the solution. The color changes to purple the oxide formed must be a acid - alkaline solution.

Indicator is defined as any substance that indicates visibly the presence or absence of a threshold concentration of a chemical species, such as an acid or an alkali in a solution, typically through a color change. The last point is demonstrated by a physical modification of the reaction or by the addition of an additional reagent, both of which are referred to as indicators.

In water, acids create acidic solutions. Hydrogen ions, or H+ in aqueous solution, are produced by acids. In water, alkalis produce alkaline solutions. In an aqueous solution, alkalis form hydroxide ions, or OH-. The pH scale determines whether a solution is acidic or alkaline. A pH probe can be used to measure a solution's pH, or the pH can be inferred using a color chart and universal indicator.

Thus, they mix it with water and then add universal indicator to the solution. The color changes to purple the oxide formed must be a acid - alkaline solution.

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Answer: true i think tell me if im wrong

Answer:

a dissolved substance especially or a component of a solution present in smaller amount than the solvent

Explanation:

have a good day

Answer:

A solute is a minor component in a solution, this is dissolved in the solvent.

Explanation:

Answer:

the law of inertia

Explanation:

Answer:

Newton's first law of motion states that an object at rest will remain at rest, and an object in motion will remain in motion with a constant velocity, unless acted upon by an external force. The trials of Newton's first law of motion are:

Inertia: The tendency of an object to resist changes in its motion, which is a direct consequence of Newton's first law. For example, a book resting on a table will remain at rest unless acted upon by an external force such as someone picking it up or the table collapsing.

Acceleration: If an external force acts on an object, it will accelerate. For example, a ball sitting on a flat surface will not move unless a force is applied, such as someone pushing it. Once the force is applied, the ball will accelerate in the direction of the force.

Equilibrium: When the net force acting on an object is zero, it is said to be in equilibrium. For example, a person standing still on the ground is in equilibrium because the gravitational force pulling them down is balanced by the force of the ground pushing up on them.

Friction: Friction is a force that opposes motion between two surfaces that are in contact with each other. This force is another example of an external force that can affect an object's motion, and is related to Newton's first law because it can cause an object to come to rest if the force of friction is greater than the force applied to the object.

The decrease in the production of corn per acre over several years, despite similar weather conditions, suggests a change in an abiotic factor affecting the corn growth. The most likely factor causing this decrease is a decrease in soil nutrients.

The abiotic factor that is most likely causing the decrease in the production of corn in a field planted every year is the decrease in soil nutrients. The soil contains the essential nutrients necessary for plant growth, such as nitrogen, phosphorus, and potassium.

Over time, continuous planting without adequate soil nutrient replacement can deplete the soil of these necessary nutrients, resulting in a decrease in the production of corn per acre despite similar weather conditions. The farmer should have used a method of soil conservation such as crop rotation, application of fertilizers, or fallow (giving the land a rest for a period). All these techniques aim at enriching the soil with nutrients.

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Answer:

JUST B

Explanation: