Help me with this please ASAP

Answer:

A

Explanation:

In plant and yeast cells pyruvate is converted into carbon dioxide and a type of alcohol called ethanol . This process is called fermentation and yields only two molecules of ATP per glucose molecule broken down.

\(CO_2 + H_20\)+ light energy → \(O_2\) + sugar chemical equation represents a process that takes place in yeast cells. Hence, option A is correct.

A representation of a chemical reaction using symbols of the elements to indicate the amount of substance, usually in moles, of each reactant and product.

In plant and yeast cells pyruvate is converted into carbon dioxide and a type of alcohol called ethanol. This process is called fermentation and yields only two molecules of ATP per glucose molecule broken down.

Hence, option A is correct.

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Answer:

0.465 M IS THE MOLARITY OF CALCIUM CHLORIDE SOLUTION.

Explanation:

Volume of CaCl2 = 33.8 mL = 33.8 / 1000 L = 0.0338 L

Volume of AgNO3 = 41.2 mL = 0.0412 L

Molarity of AgNO3 = 0.877 M

First is to write and balance out the equation for the reaction

2AgNO3 + CaCl2 ---------> 2AgCl + Ca(NO3)2

From the reaction, we could see that 2 moles of AgNO3 combines with 1 mole of CaCl2 to produce 12 moles of AgCl and 1 mole of Ca(NO3)2.

In volmetric analysis, the relationship between molarity and volume of acids and bases is shown in the equation below:

MaVa / Mb Vb = Na / Nb

Ma = molarity of acid = 0.877 M

Va = volume of acid = 0.0412 L

Mb = molarity of base = unknown

Vb = volume of base = 0.0338 L

Na = number of moles of acid = 2

Nb = number of mole of base = 1

Rearranging the formulae, making Mb the subject of the equation, we get:

Mb = Ma Va Nb / Vb Na

Mb = 0.877 * 0.0412 * 1 / 0.0338 * 2

Mb = 0.0361 / 0.0776

Mb = 0.465 M

So therefore, the molarity of calcium chloride solution if the variables given were used is 0.465 M.

The molarity of calcium chloride solution if 33.8 mL of it are needed to react with 41.2 mL of 0.877 M AgNO3 is 1.07M

HOW TO CALCULATE MOLARITY:

The molarity of calcium chloride solution can be calculated by using the following formula:

C1V1 = C2V2

Where;

C1 = concentration of calcium chloride

V1 = volume of calcium chloride

C2 = concentration of silver nitrate

V2 = volume of silver nitrate

According to this question, 33.8 mL of CaCl2 are needed to react with 41.2 mL of 0.877 M AgNO3.

33.8 × C1 = 0.877 × 41.2

33.8C1 = 36.13

C1 = 36.13 ÷ 33.8

C1 = 1.07M

Therefore, the molarity of calcium chloride solution if 33.8 mL of it are needed to react with 41.2 mL of 0.877 M AgNO3 is 1.07M.

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100 mL of 2.0 M HNO3 is needed to neutralize 40.0 mL of 5.0 M NaOH.

To determine the volume of 2.0 M HNO3 needed to neutralize 40.0 mL of 5.0 M NaOH, we can use the concept of stoichiometry and the balanced chemical equation for the neutralization reaction between HNO3 and NaOH.

The balanced chemical equation for the reaction is:

HNO3 + NaOH → NaNO3 + H2O

From the balanced equation, we can see that the stoichiometric ratio between HNO3 and NaOH is 1:1. This means that 1 mole of HNO3 reacts with 1 mole of NaOH.

First, let's calculate the number of moles of NaOH in 40.0 mL of 5.0 M NaOH:

moles of NaOH = volume (in L) × concentration (in M)

moles of NaOH = 0.040 L × 5.0 M = 0.2 moles

Since the stoichiometry is 1:1, we know that 0.2 moles of HNO3 are required to neutralize 0.2 moles of NaOH.

Now, let's calculate the volume of 2.0 M HNO3 needed to provide 0.2 moles of HNO3:

volume of HNO3 = moles of HNO3 / concentration (in M)

volume of HNO3 = 0.2 moles / 2.0 M = 0.1 L or 100 mL

Therefore, 100 mL of 2.0 M HNO3 is needed to neutralize 40.0 mL of 5.0M NaOH.

It's important to note that during the neutralization reaction, the reaction goes to completion. However, in practice, it is recommended to add the acid slowly and carefully while continuously monitoring the pH to ensure complete neutralization and avoid over-titrating.

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A) 02(9)

hope it help you(•‿•)

Entropy is defined as the degree of disorder of a system.

As the degree of disorder of water is given by

Entropy is more in gaseous state of water.

Option d is correct

According to the question the mass of CO2 produced in the reaction is 5.60 g.

Mass is the measure of the amount of matter in an object. It is usually measured in kilograms (kg) or grams (g). Mass is different from weight, which is the measure of the gravitational force on an object. Mass is a scalar quantity, meaning it has only magnitude, not direction. Mass is an intrinsic property of an object, meaning it is the same wherever it is measured. Mass is not affected by gravity or location, so it is the same on Earth and in outer space.

a. The mass of CO2 produced in the reaction is 5.60 g.

b. The final temperature inside the vessel after combustion is 632°C.

c. The partial pressure of CO2 and the total pressure in the vessel after combustion are 1.40 atm and 5.40 atm, respectively.

d. The average speed of the CO2 molecules in the vessel after combustion is 1187 m/s.

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The first half-reaction is the oxidation of Cr2O7^2– to Cr^3+ and the second half-reaction is the reduction of I^– to IO3^–. When combined, the overall reaction is Cr2O7^2– + I^– → Cr^3+ + IO3^–.

The electrolytic cell consists of two electrodes, one anode and one cathode, both of which are immersed in an electrolyte solution. At the anode, the Cr2O7^2– ions are oxidized to Cr^3+ ions, releasing electrons into the external circuit.

At the cathode, the I^– ions are reduced to IO3^– ions, and the electrons from the external circuit are used to drive the reaction. The electrolyte solution must contain both Cr2O7^2– and I^– ions in order to facilitate the transfer of electrons between the electrodes.

The overall reaction is driven by the potential difference between the anode and the cathode, which is created by the flow of electrons through the external circuit.

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Answer:

To determine the empirical formula of a compound, we need to know the relative amounts of each element in the compound. Given the masses of iron and sulfur, we can calculate the number of moles of each element present:

moles of iron = 39.27 g / 55.85 g/mol = 0.703 mol

moles of sulfur = 33.77 g / 32.06 g/mol = 1.053 mol

We can then find the ratio of these moles by dividing both by the smallest number of moles (0.703):

0.703 mol Fe : 1.053 mol S

0.667 Fe : 1.000 S

This ratio indicates that there are approximately 0.667 atoms of iron for every 1 atom of sulfur in the compound.

To convert this ratio to a whole-number ratio of atoms, we need to multiply by a factor that will give us whole numbers. We can do this by dividing both sides of the ratio by the smallest number of atoms:

0.667 Fe : 1.000 S

0.667/0.667 Fe : 1.000/0.667 S

1.000 Fe : 1.498 S

This gives us a ratio of approximately 1 atom of iron for every 1.498 atoms of sulfur. To get a whole-number ratio, we can multiply both sides by 2:

2.000 Fe : 2.996 S

Rounding to the nearest whole number, we get a ratio of:

2 Fe : 3 S

Therefore, the empirical formula of the compound is Fe2S3.

Answer:

Explanation:

hope this helps you

The mass of the marble is greater than that of the water. The marble weighs more than an equivalent volume of the water. The force from dropping the marble breaks the surface tension of the water. The marble has greater mass and volume than the water.

Types of luminous flames:

1. Yellow Luminous Flame

2. Smoky Luminous Flame

3. Orange Luminous Flame

4. Blue Luminous Flame

Luminous flames are characterized by their visible glow, which is caused by the incomplete combustion of fuel. The presence of soot particles in the flame causes the emission of light. There are different types of luminous flames, which can be classified based on their fuel composition and burning conditions. Here are some common types of luminous flames:

1. Yellow Luminous Flame: This is the most common type of luminous flame, often seen in open fires, candles, and gas stoves. It appears yellow due to the presence of soot particles in the flame. Yellow flames indicate incomplete combustion of hydrocarbon fuels, such as methane, propane, or natural gas. The high carbon content in these fuels leads to the formation of soot, which emits visible light.

2. Smoky Luminous Flame: This type of flame is characterized by a significant amount of black smoke and soot production. It is commonly observed in poorly adjusted or malfunctioning burners or engines. The excessive presence of unburned fuel in the flame results in incomplete combustion and the emission of dark smoke particles.

3. Orange Luminous Flame: An orange flame indicates a higher combustion temperature compared to a yellow flame. It is often seen in more efficient burners or when burning fuels with a higher carbon content, such as oil or diesel. The higher temperature helps in burning more of the carbon particles, reducing the amount of soot and making the flame appear less yellow.

4. Blue Luminous Flame: A blue flame is typically associated with complete combustion. It indicates efficient burning of fuel, resulting in minimal soot formation. Blue flames are commonly observed in gas burners or Bunsen burners. The blue color is a result of the combustion of gases, such as methane, in the presence of sufficient oxygen.

It's important to note that the luminosity of a flame can vary depending on factors such as fuel-air mixture, combustion temperature, and the presence of impurities. Achieving complete combustion and minimizing the production of soot is desirable for efficient and cleaner burning processes.

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Answer: C3H2O

Explanation: To find the empirical formula of the compound, we need to determine the simplest whole number ratio of atoms in the compound.

Assuming we have 100 g of the compound, we can convert the percentages to masses of each element:

Carbon: 66.7 g

Hydrogen: 3.74 g

Oxygen: 29.6 g

Next, we need to convert these masses to moles using the atomic masses:

Carbon: 66.7 g / 12.01 g/mol = 5.55 mol

Hydrogen: 3.74 g / 1.01 g/mol = 3.70 mol

Oxygen: 29.6 g / 16.00 g/mol = 1.85 mol

Now we need to divide each of these mole values by the smallest of the three:

Carbon: 5.55 mol / 1.85 mol = 3.00

Hydrogen: 3.70 mol / 1.85 mol = 2.00

Oxygen: 1.85 mol / 1.85 mol = 1.00

These ratios give us the empirical formula:

C3H2O

However, we can simplify this formula by dividing each subscript by 2:

C1.5H1O0.5

Finally, we can multiply through by 2 to get rid of the decimals:

C3H2O

The value of the following expression is 0.0429 rounded off to 0.043. The correct number of significant figures is 2.

The given expression (6.5 - 6.35) / 3.49  is calculated as below

(6.5 - 6.35) / 3.49

0.15 / 3.49

0.04297

0.043

Zeros to the left of the first non-zero digit are considered as not significant. For example 0.00765 has only 3 significant numbers.

When multiplying and dividing measured quantities, the output of the calculation should have the same number of significant figures as the measured quantity with the fewest significant figures. When performing multiple stage calculations, do not round intermediate stage calculation results; keep as many digits as is practical and round off only in the final output

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The solubility of the salts is affected by the temperature changes. 1. NaCl is least affected by temperature. 2. supersaturated. 3. 60 grams KBr. 4. Ethanol has both polar and non-polar groups. 5. Mixing and shaking.

A KBr solution with 90 gm solute in 100 grams of water at 50 degrees is classified as supersaturated. 60 grams of KBr are needed to make a saturated solution in 100 gm of water at 30 degrees.

Ethanol is a general solvent due to the presence of both the polar and the non-Polar groups. As a result, it is easier to dissolve both polar molecules and non-Polar molecules. The dissolving rate can be increased by mixing or shaking the solution. Also, the sugar dissolves faster in hot than cold tea.

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Answer: Light, Chemical

Explanation: This is the answer because "photosynthesis takes place in two stages: the light-dependent reactions and the Calvin cycle. In the light-dependent reactions, which take place at the thylakoid membrane, chlorophyll absorbs energy from sunlight and then converts it into chemical energy with the use of water." - source https://opentextbc.ca/

In the photosynthesis the energy starts as Light energy and ends up as Chemical Energy. Hence option (D) is correct

The process by that inexperienced plants and a few different organisms use daylight to synthesize nutrients from carbonic acid gas and water. chemical action in plants usually involves the inexperienced pigment and generates element as a by-product.

Photosynthesis may be a method employed by plants and different organisms to convert lightweight energy into energy that, through internal respiration, will later be discharged to fuel the organism's activities.

photosynthesis takes place in 2 stages: the light-dependent reactions and also the Calvin cycle. within the light-dependent reactions, that manifest itself at the thylakoid membrane, pigment absorbs energy from daylight and so converts it into energy with the employment of water.

Therefore, In the photosynthesis the energy starts as Light energy and ends up as Chemical Energy. Hence option (D) is correct

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DNA describes as a blueprint for a cell because it contain the instruction needed for an organism to grow develop and survive

DNA is called a blueprint of life because it contain the instruction needed for an organism to grow develop and survive and reproduce and DNA does this by controlling protein synthesis and protein do must of the work cell and are basic unit of structure and function in the cell of organism

DNA is read by the enzyme RNA polymerase and this enzyme attaches itself to the DNA strand slightly in front of a gene and it then slides along the DNA strand making a copy of the gene only using RNA building blocks instead of DNA building block

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Answer: Element I

Explanation: not 100% sure but i think its element I since it has the most colour changes which should mean it reacts more. hope its correct and hope it helps!

If the Sun's surface became much hotter (while the Sun's size remained the same), the Sun would emit more ultraviolet light but less visible light than it currently emits. The statement is True.

Solar radiation is radiant (electromagnetic) energy from the sun. It provides light and heat for the Earth and energy for photosynthesis. This radiant energy is necessary for the metabolism of the environment and its inhabitants 1. The three relevant bands, or ranges, along the solar radiation spectrum are ultraviolet, visible (PAR), and infrared.

Ultraviolet radiation makes up just over 8% of the total solar radiation.

When heat increases, so does the frequency and energy of the wavelengths. Because of this, some visible light would be converted to ultraviolet light.

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A 50.0 mL solution of 0.250 M HC₂H₃O₂ before and after adding 50 mL of 0.250 M NaOH has a pH of 2.87, the pH changes due to the formation of a buffer solution, which can be calculated using the Henderson-Hasselbalch equation.

This problem requires us to calculate the pH of a buffer solution after the addition of a strong base. A buffer solution is one that resists pH changes when modest amounts of acid or base are added. The buffer system in this case is the weak acid, acetic acid (HC₂H₃O₂) and its conjugate base, acetate ion (C₂H₃O₂-).

Before the addition of NaOH, we have a solution of 0.250 M HC₂H₃O₂, which we can assume to be completely dissociated in water:

HC₂H₃O₂ + H₂O ⇌ H₃O+ + C₂H₃O₂-

HC₂H₃O₂ has a Ka value of 1.8 x 10-5. We can use this Ka value to calculate the equilibrium concentration of H3O+ and C₂H₃O₂- in the solution.

First, we need to calculate the initial concentrations of HC₂H₃O₂ and C₂H₃O₂-.

moles of HC₂H₃O₂ = 0.250 M × 0.0500 L = 0.0125 mol

moles of C₂H₃O₂- = 0 mol (since there is no NaOH added yet)

Since HC₂H₃O₂ is a weak acid, it only partially dissociates in water. The equilibrium concentrations of H₃O+ and C₂H₃O₂- can be calculated using the Ka expression:

Ka = [H₃O+][C₂H₃O₂-]/[HC₂H₃O₂]

We can assume that the initial concentration of H3O+ is negligible compared to the amount that will be produced by the dissociation of HC₂H₃O₂, so we can simplify the expression to:

Ka = [H₃O+]²/[HC₂H₃O₂]

[H₃O+]² = Ka × [HC₂H₃O₂]

[H₃O+]² = 1.8 × 10⁻⁵ × 0.0125

[H₃O+] = 1.34 × 10⁻³ M

Now that we know the equilibrium concentration of H₃O+, we can use the pH formula to calculate the pH:

pH = -log[H₃O+]

pH = -log(1.34 × 10⁻³)

pH = 2.87

This is the pH of the buffer solution before the addition of NaOH.

Next, we add 50 mL of 0.250 M NaOH to the solution. NaOH is a strong base, so it completely dissociates in water to produce OH- ions:

NaOH → Na+ + OH-

The OH- ions will react with the acetate ions in the buffer solution to form water and acetate ions:

OH- + C₂H₃O₂- → H₂O + C₂H₃O₂-

This reaction will consume some of the acetate ions in the buffer solution, causing the equilibrium to shift to the left to produce more acetate ions.

To calculate the new concentrations of H₃O+ and C₂H₃O₂-, we need to use the Henderson-Hasselbalch equation:

pH = pKa + log([C₂H₃O₂-]/[HC₂H₃O₂])

where pKa = -log(Ka), [C₂H₃O₂-] is the equilibrium concentration of acetate ions, and [HC₂H₃O₂] is the equilibrium concentration of acetic acid.

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Elements cannot be broken down into simpler substances by any or series of chemical reactions.

A compound can be broken done by chemical reactions

An element can be defined as species of atoms having a certain number of protons in their nuclei and pure substance of that species.  

Elements cannot be broken down into simpler substances by any or series of chemical reactions.

A compound can be defined as a chemical substance  that is composed of numerous identical molecules containing atoms from more than one element and held together by chemical bonds.

A compound can be broken done by chemical reactions

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46. Covalent bonds are formed by sharing electrons between atoms.

Covalent bonds are chemical bonds formed when two atoms share electrons. They occur between nonmetal atoms and involve the sharing of electron pairs, resulting in the formation of a stable molecule. Covalent bonds are typically found in molecular compounds.

47. Ionic bonds are formed by gaining or losing electrons between metals and nonmetals.

48. A subscript is used in a formula to indicate the number of atoms of an element in a compound.

49. Chemical reactivity or stability depends on the number of outer energy levels (valence shells) in atoms.

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Answer:

B.

Explanation:

Can you give me brainliest? i need to rank up

Answer:

2nd One is correct

The volume of the gas at 101.3 kPa and 24°C will be 24.58 L.

Gas law is a set of empirical laws that describe the physical behavior of a gas. They are derived from experiments on gases, and they relate the pressure, volume, and temperature of a gas. The most famous gas law is the Ideal Gas Law, which states that the pressure, volume, and temperature of an ideal gas are related by the equation PV=nRT, where P is the pressure, V is the volume, n is the amount of gas, R is the gas constant, and T is the temperature.

At constant pressure, the volume of a gas will increase as its temperature increases. This is because the molecules are moving faster, so they take up more space. Therefore, the volume of the gas at 101.3 kPa and 24°C will be greater than 0.8 L. To calculate the exact volume, you would need to use the ideal gas law:
PV = nRT
where P is pressure,
V is volume,
n is the number of moles of gas,
R is the ideal gas constant, and
T is temperature in Kelvin.
Solving for V, we get:
V = (nRT) / P
Plugging in the given values, we get:
V = (n * 8.314 * 297.15) / 101.3
V = 24.58 L
Therefore, the volume of the gas at 101.3 kPa and 24°C will be 24.58 L.

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Answer:

D) 0 (zero)

Explanation:

There's a rule that neutral compounds (compound) without charges have oxidation of zero. Also, another formula that if two atoms of the same element make one single molecules such as diatomics molecules are O2, N2, I2, Br2 oxidation states are zero, thus here N is 0 (Zero) as well.

Answer:

will be 9.7 Liters

Explanation:

The two atoms are isotopes of each other are Si with a mass number of 27 and an atomic number 14, and Mg with a mass number of 25 and an atomic number of 12. The correct option is A.

Isotopes are atoms with the same number of protons but differing numbers of neutrons.

They differ in mass, which affects their physical characteristics even if they have nearly identical chemical properties.

An isotope is one of two or more chemical elements that exist in different forms. Varied isotopes of an element share the same atomic number and protons in their nuclei, giving them the same atomic weight.

However, each elemental isotope has a different amount of neutrons, which changes its atomic weight.

They can be referred to as isotopes because Si, which has a mass number of 27 and an atomic number of 14, and Mg, which has a mass number of 25 and an atomic number of 12, both have 13 protons.

Thus, the correct option is A.

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Answer:

The balanced chemical reaction is given as:

\(Cs_2SO_4(aq)+Ba(ClO_4)_2(aq)\rightarrow BaSO_4(s)+2CsClO_4(aq)\)

Explanation:

When aqueous cesium sulfate and aqueous barium perchlorate are mixed together it gives white precipitate barium sulfate and aqueous solution od cesium perchlorate.

The balanced chemical reaction is given as:

\(Cs_2SO_4(aq)+Ba(ClO_4)_2(aq)\rightarrow BaSO_4(s)+2CsClO_4(aq)\)

According to reaction, 1 mole of cesium sulfate reacts with 1 mole of barium perchlorate to give 1 mole of a white precipitate of barium sulfate and 2 moles of cesium perchlorate.

KCl → k+ + Cl. The ensuing aggregate of ions is identical in each pre-and publish-blend unit of compounds. both comprise Na+, Cl-, okay+, and Br- ions, and no insoluble compounds can result from any mixture of those ions.

The three rules for writing net ionic equations are simply pretty trustworthy. only do not forget to break apart the (aq) substances. best split strong electrolytes.

Delete any ions that seem on both sides of the equation. when an aqueous solution of potassium chloride KCl, while combined with silver nitrate AgNO3 answers insoluble AgCl forms as a white substance. this is an example of a double displacement reaction. due to the fact potassium ion and silver ions displace collectively in the product formation.

The net ionic equation is a chemical equation for a response that lists best those species collaborating inside the reaction. The internet ionic equation is generally utilized in acid-base neutralization reactions, double displacement reactions, and redox reactions.

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Answer:

To find the mass of 3.4 x 10^23 molecules of H2O, we need to use the molar mass of water to convert the number of molecules into grams.

The molar mass of water (H2O) is:

2(1.008 g/mol) + 1(15.999 g/mol) = 18.015 g/mol

This means that one mole of water has a mass of 18.015 grams.

To find the mass of 3.4 x 10^23 molecules of water, we can use the following steps:

Determine the number of moles of water in 3.4 x 10^23 molecules:

n = number of molecules / Avogadro's number

n = (3.4 x 10^23) / 6.022 x 10^23 molecules/mol

n = 0.565 mol

Convert the number of moles to grams using the molar mass of water:

mass = number of moles x molar mass

mass = 0.565 mol x 18.015 g/mol

mass = 10.17 g

Therefore, the mass of 3.4 x 10^23 molecules of H2O is approximately 10.17 grams.

Answer:  The volume occupied at an altitude of 20.0 km is 34.5289 L

Explanation:

Boyle's Law: This law states that pressure is inversely proportional to the volume of the gas at constant temperature and number of moles.

\(P\propto \frac{1}{V}\)     (At constant temperature and number of moles)

where,

\(P_1\) = initial pressure of gas = 101.325 kPa ( sea level)

\(P_2\) = final pressure of gas = 10 kPa

\(V_1\) = initial volume of gas = 3.40774 L

\(V_2\) = final volume of gas = ?

Now put all the given values in the above equation, we get the final pressure of gas.

\(101.325\times 3.40774=10\times V_2\)

\(V_2=34.5289L\)

Therefore, the volume occupied at an altitude of 20.0 km is 34.5289 L