In a covalent bond, two atoms are held together by the attraction between

Answer:

Fe + CuCl2 = FeCl2 + Cu

Explanation:

This is already balanced.

A food chain refers to the order of events in an ecosystem, where one living organisms eats another organisms and later that organism is consumed by another larger organism. It also explains the feeding pattern.

The food chain is a linear sequence of organisms where the nutrients and energy is transferred from one organism to the other. It begins with the producer and ends with decomposer.

The producers in a food chain consists of all autotrophs like phytoplankton, algae and green plants. It is the producers which utilize the energy from the sun to produce food.

Thus the correct option is B.

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Answer:

A

Explanation:

Magnesium react with steam will produce magnesium oxide (MgO) plus Hydrogen gas (H2).

The complete balanced chemical equation  which describes a bacterium's metabolism is CH₃COOH(aq)----->CH₄ + CO₂.

Balanced chemical equation includes the expansion of stoichiometric coefficients to the reactants and items. This is significant in light of the fact that a chemical reaction should submit to the law of protection of mass and the law of steady extents, for example similar number of molecules of every component should exist on the reactant side and the item side of the situation.

Two fast and simple techniques for balanced chemical equation are examined in this article. The main strategy is the conventional adjusting technique and the subsequent one is the mathematical adjusting strategy.

A Balanced chemical equation is an emblematic portrayal of a substance response wherein the reactants and items are indicated by their particular synthetic formulae.

An illustration of a Balanced chemical equation is 2H₂ + O₂ → 2H₂O which depicts the response among hydrogen and oxygen to shape water

The reactant side is the piece of the Balanced chemical equation to the left of the '→' image while the item side is the part to the right of the bolt image.

Number of carbon atoms on both sides of equation is two and number of atoms of hydrogen is 4 on both sides. So, given equation is already balanced.

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(Complete question) is:

Different strains of methanogenic bacteria metabolize different small molecules to produce energy. Complete the balanced chemical equation describing a bacterium's metabolism of the following molecules. 1st attempt Part 1 (1 point) dd See Periodic Table. While typically we do not add coefficients of one. For this question please add coefficients of one. CH₃COOH(aq) → CH₄(g) + CO₂(g)

The mass of Carbon di oxide formed is 220 gm , Option C is the correct answer.

A balanced equation is when the moles of the reactants is equal to the moles of the products.

The equation of Carbon reacting with oxygen is given by

C + O₂ -----> CO₂

Mole fraction of Carbon and oxygen is 1:1

Molecular weight of Carbon is 12

Molecular weight of Oxygen is 16

Moles of Carbon = 60/12 = 5

Moles of Oxygen = 750/16 = 46.875

As Carbon is the limiting reagent

For 5 moles of Carbon , 5 moles of Carbon-di-oxide is formed.

5 moles of Carbon di oxide means 5 *44 = 220 gm.

Therefore , The mass of Carbon di oxide formed is 220 gm.

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71. The broad, painless, pink-gray, wart-like infectious lesions that may develop on the vulva, perineum, or anus in syphilis are called "condyloma lata."

72. In suspected syphilis infection, the term RPR stands for "Rapid Plasma Reagin." It is a blood test used to screen for syphilis.

73. The recommended dosage of Benzathine Penicillin in an adult in Zambia may vary depending on the stage and severity of the syphilis infection. It is best to consult local guidelines or a healthcare professional for the specific recommended dosage in Zambia.

74. The recommended drug for the treatment of gonorrhea when using syndromic management may vary depending on local guidelines and antibiotic resistance patterns. Commonly used antibiotics include ceftriaxone in combination with azithromycin or doxycycline.

75. The causative organism for chancroid is called "Haemophilus ducreyi."

76. The commonest type of HIV is "HIV-1."

77. The assertive, problem-solving approach to the identification and treatment of the patient's problems is called "clinical decision-making."

78. A tumor arising from the cells producing melanin is also known as "melanoma."

79. The type of sound described as drum-like, loud, and empty quality felt over a gas-filled stomach, intestine, or pneumothorax during percussion is called "tympany."

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d

i think

Explanation:

If you're attempting to synthesize 2 benzyl pentanoic acid from acetoacetic ester, keep in mind that you can do so fairly quickly by following these simplified instructions:

From its pungent free scent to its solid state at temperatures ranging from 118 120°C, acetoacetic ester (better known as ethyl acetoacetate) offers significant value for those working within organic synthesis.

As one of many potent ketones utilized by researchers around the globe its unique properties make it ideal for building complex molecules essential for modern medicine and more.

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Answer:

the answer is C) iron & nickel

Explanation:

hope it helps and have a good Day

Writing and balancing complex half-reactions in acidic solutions involves a systematic approach. Here are the general steps to follow:

Identify the oxidation and reduction half-reactions: Determine which species is being oxidized (losing electrons) and which is being reduced (gaining electrons).

Balance the atoms: Begin by balancing all atoms except hydrogen and oxygen in each half-reaction.

Balance the charges: Add electrons (e-) to one side of each half-reaction to balance the charges.

Balance the oxygen atoms: Add water (H2O) to the side of the equation that lacks oxygen atoms.

Balance the hydrogen atoms: Add hydrogen ions (H+) to the side of the equation that lacks hydrogen atoms. Keep in mind that the solution is acidic.

Balance the charges: Adjust the number of electrons (e-) on each side of the equation to ensure that the charges are balanced.

Multiply the half-reactions: Multiply each half-reaction by an appropriate factor so that the number of electrons gained and lost are equal.

Combine the half-reactions: Add the two balanced half-reactions together and cancel out common terms on both sides of the equation.

By following these steps, you can effectively write and balance complex half-reactions in acidic solutions, ensuring that the overall reaction is balanced in terms of both atoms and charges.

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a) To calculate the minimum frequency of electromagnetic radiation required to release electrons from the metal, you can use the following formula:

f = W / h

where f is the minimum frequency of electromagnetic radiation required, W is the work function of the metal in joules, and h is the Planck constant in joules per second.

Plugging in the values for W and h, you get:

f = (5.86 x 10^-19 J) / (6.626 x 10^-34 J/s) = 8.9 x 10^14 Hz

This is the minimum frequency of electromagnetic radiation required to release electrons from the magnesium metal.

b) To calculate the kinetic energy of the ejected electronic light of frequency 2.00 x 10^14 Hz, you can use the following formula:

KE = hf - W

where KE is the kinetic energy of the ejected electron, h is the Planck constant in joules per second, f is the frequency of the electromagnetic radiation in hertz, and W is the work function of the metal in joules.

Plugging in the values for h, f, and W, you get:

KE = (6.626 x 10^-34 J/s) * (2.00 x 10^14 Hz) - (5.86 x 10^-19 J) = 1.32 x 10^-19 J - 5.86 x 10^-19 J = -4.54 x 10^-20 J

This is the kinetic energy of the ejected electron when light of frequency 2.00 x 10^14 Hz is used to irradiate the magnesium metal. Since the kinetic energy is negative, this means that the electron is not released from the metal when irradiated with this frequency. The frequency of the electromagnetic radiation needs to be higher than the minimum frequency required to release the electron in order for the electron to be ejected from the metal.

Based on the given reaction, the standard enthalpy of reaction is the 177.8 kJ of heat absorbed when calcium carbonate decomposes under standard conditions to produce calcium oxide and carbon dioxide.

The change in enthalpy that takes place in a system when matter undergoes a certain chemical reaction and all reactants and products are in their initial states is known as the standard enthalpy of reaction (Hr).

The enthalpy of a reaction refers to the heat changes that occur in a reaction as products are formed from reactant molecules.

Under standard reaction conditions, the sum of the overall heat changes that occur, thus, is defined as the standard enthalpy of the reaction.

In the given reaction, calcium carbonate decomposes under standard conditions to produce calcium oxide and carbon dioxide with the absorption of 177.8 kJ of heat. Hence, the standard enthalpy of the reaction is =177.8 kJ.

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The first step to solve this question is to balance the given equation. To do it, make sure that the amount of every element is equal in both, reactants and products.

Now, use the stoichiometric ratio between the coefficients of potassium oxide and potassium nitride:

The answer is 4.66moles of magnessium nitride.

The mass of the cereal that you would need to consume can be obtained as 84.8 g

The number of moles, denoted by the symbol "n," is a fundamental unit of measurement in chemistry that represents the amount of a substance. It is used to quantify the quantity of atoms, molecules, or ions in a sample.

Number of moles of sucrose in the cereal = 11g/342 g/mol

= 0.03 moles

Now;

0.03 moles of sucrose is contained in 60 g of cereal

0.0424 moles of sucrose would contain 0.0424 moles * 60 g/0.03 moles

= 84.8 g

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0.6066 moles of water are produced by complete ammoxidation of 145 g of o-xylene.

Number of moles are calculated by dividing the mass by the molar mass of the substance.In the reaction between o-xylene ,ammonia and oxygen pthalonitrile  is produced.

Here, the number of o-xylene is calculated by the above mentioned formula which is 1.365 moles.Then, as per stoichiometry and balanced chemical equation ,

1.365 moles of o-xylene×8 moles of water/1 mole of xylene ×18 g water

=0.6066 moles

Thus,0.6066 moles of water are produced from 145 g of o-xylene.

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Answer:

B

Explanation:

The picture looks like it is of fungi and fungi is not identified as either plants or animals. They form their own kingdom of life and don't classify as plants or animals.

\(Hello!\)

Your answer is correct.

Because, it doesn't classifed as a animal nor a plant.

Hopefully, this helps you!!

\(Sokka\)

The final volume of the system, given that half of the gas is removed, leaving 0.50 mole in the cylinder and the system is warmed to 900 K is 18.45 liters

From ideal gas equation, we have

PV = nRT

Rearrange

V / nT = R/ P

R / P = Constant

Thus, we have

V₁ / n₁T₁ = V₂ / n₂T₂

Where

With the above formula, we can obtain the final volume of the system as follow:

V₁ / n₁T₁ = V₂ / n₂T₂

12.3 / (1 × 300) = V₂ / (0.5 × 900)

Cross multiply

1 × 300 × V₂ = 12.3 × 0.5 × 900

300 × V₂ = 5535

Divide both side by 300

V₂ = 5535 / 300

V₂ = 18.45 liters

Thus, the final volume of the system is 18.45 liters

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The concept ideal gas equation is used here to determine the volume of the carbondioxide. Combustion reactions are generally highly exothermic reactions. The volume of CO₂ is

A combustion is a chemical reaction in which a fuel undergoes oxidation as a result of the reaction with an oxidizing agent which causes the release of energy in the form of heat.

15.0 °C = 288 K

The ideal gas equation is:

PV = nRT

V = nRT / P

V = 354 × 0.0821 × 288 / 0.995 = 8412.3 L

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The ideal gas law may be used to determine the volume of oxygen created in the electrolysis that produces 548 litres of hydrogen at STP (Standard Temperature and Pressure). PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature, according to the ideal gas equation.

The pressure is 1 atm, the temperature is 273 K, and the number of moles of hydrogen is 548/22.4 = 24.5 in this example. We may compute the volume of oxygen created by rearranging the ideal gas law: V = nRT/P = 24.5*0.082*273/1 = 483.3 litres.

As a result, the volume of oxygen created in the electrolysis at STP that produces 548 litres of hydrogen is 483.3 litres.

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Answer:

23430.4 J.

Explanation:

From the question given above, the following data were obtained:

Mass (M) = 70 g

Initial temperature (T₁) = 10 °C

Final temperature (T₂) = 90 °C

Specific heat capacity (C) = 4.184 J/gºC

Heat (Q) required =?

Next, we shall determine the change in the temperature of water. This can be obtained as follow:

Initial temperature (T₁) = 10 °C

Final temperature (T₂) = 90 °C

Change in temperature (ΔT) =?

ΔT = T₂ – T₁

ΔT = 90 – 10

ΔT = 80 °C

Finally, we shall determine the heat energy required to heat up the water. This can be obtained as follow:

Mass (M) = 70 g

Change in temperature (ΔT) = 80 °C

Specific heat capacity (C) = 4.184 J/gºC

Heat (Q) required =?

Q = MCΔT

Q = 70 × 4.184 × 80

Q = 23430.4 J

Therefore, 23430.4 J of heat energy is required to heat up the water.

The lead(II) nitrate solution has a molarity of 1.2M if 22.00 mL of 2.00 M potassium iodide is required to equilibrate with 18.00 mL of lead(II) nitrate.

The following formula can be used to determine a solution's molarity:

na/nb = CaVa/CbVb

Where;

Ca is the acid concentration.

Cb = base concentration

Va = acid volume

Vb = base volume

na = number of acid moles

nb = number of base moles

The reaction's balanced equation is as follows:

2KNO3 (aq) + PbI2 Pb(NO3)2 (aq) + 2KI (s)

22 × 2/18 × Cb = 2/1

44/18Cb = 2

Cb = 44 ÷ 36

Cb = 1.2M

Since 22.00 mL of 2.00 M potassium iodide is required to equilibrate with 18.00 mL of lead (II) nitrate, the lead(II) nitrate solution's molarity is 1.2M.

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Answer:

NADH is formed

Explanation:

If oxygen exists in the system, pyruvate goes into mitochondrial matrix in order to perform kreb's cycle and forms NADH

Otherwise, pyruvate forms into lactate acid.

Good luck on your final exam

Answer:

The answer is D

Explanation:

Non metals are:

Hydrogen (H)

Sulphur (S)

Phosphorus (P)

Carbon (C)

Fluorine (F)

Oxygen (O)

Nitrogen (N)

Chlorine (Cl)

Bromine (Br)

Helium (He)

Argon (Ar)

Iodine (I)

Neon (Ne)

Krypton (Kr)

Radon (Rn)

Selenium (Se)

Xenon (Xe)

Taking into account the change of units, 100 meters are 109.361 yards and 328.084 feets.

The rule of three is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them.

That is, what is intended with it is to find the fourth term of a proportion knowing the other three.  

If the relationship between the magnitudes is direct, that is, when one magnitude increases, so does the other (or when one magnitude decreases, so does the other) , the direct rule of three must be applied.

To solve a direct rule of three, the following formula must be followed, being a, b and c known data and x the variable to be calculated:

a ⇒ b

c ⇒ x

So: \(x=\frac{cxb}{a}\)

The direct rule of three is the rule applied in this case where there is a change of units.

To perform in this case the conversion of units, you must first know that:

Then, you can apply the following rules of three:

1 meter ⇒ 1.09361 yards

100 meters ⇒ x

So: \(x=\frac{100 metersx1.09361 yards}{1 meter}\)

Solving:

x= 109.361 yards

1 meter ⇒ 3.28084 feets

100 meters ⇒ x

So: \(x=\frac{100 metersx3.28084 feets}{1 meter}\)

Solving:

x= 328.084 feets

In summary, 100 meters are 109.361 yards and 328.084 feets.

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