clerice midter
The diagram below is the Bohr model of an atom.
Which best describes this atom?
OA. It has 6 electrons.
OB. It has a positive charge.
O c. It has 6 valence electrons.
OD.
has a full outermost energy level.

Answer:

I believe Gases A and D

Explanation:

The lines in both gases match up with the lines in the unknown mixture.

Answer:

Fa (rt) and Nitrogen

Explanation:

Glycolysis depends on a continuous supply of:

c. NAD+ (nicotinamide adenine dinucleotide)

During the process of glycolysis, glucose is broken down into pyruvate molecules. In this pathway, NAD+ is converted into its reduced form, NADH, by accepting electrons and hydrogen ions (H+) from certain steps of glycolysis. NADH acts as an electron carrier and plays a crucial role in the subsequent energy-yielding steps of cellular respiration.

The conversion of NAD+ to NADH in glycolysis is an essential step as it helps to maintain the balance of electron and energy flow in the pathway. NADH molecules produced in glycolysis are later used in the electron transport chain to generate ATP during oxidative phosphorylation. In this process, NADH donates its electrons to the respiratory chain, ultimately leading to the production of ATP.

Therefore, a continuous supply of NAD+ is necessary for the glycolytic pathway to continue functioning efficiently, ensuring the production of energy in the form of ATP.

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The order of solubility from most to least can be given as carbonate>sulfate>iodate>chloride. Carbonates are the most soluble.

The maximum amount of a material that may dissolve in another is known as its solubility. A saturated solution is created when a solvent can dissolve its maximum quantity of solute before reaching equilibrium. A supersaturated solution results when extra solutes are dissolved past its equilibrium solubility point under specific circumstances.

Dissolution is the action of disintegrating. In contrast to the speed of solution, which specifies how rapidly a molecule dissolves in a solvent, solubility is not a feature of matter. The order of solubility from most to least can be given as carbonate>sulfate>iodate>chloride.

Therefore,  the order of solubility from most to least can be given as carbonate>sulfate>iodate>chloride.

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Answer:

i dont have a answer im just answering so you can give the person who answered brailiest :)

Explanation:

Answer:  4 NH₃ + 5 O₂  →   4NO  + 6 H₂O

Explanation:

If we write out the chemical symbols for the molecules expressed in the question, along with the moles we get the following equation:

   4 NH₃ + 5 O₂  →   4 NO  + 6 H₂O

To know if the equation is balanced we can compare the Reantact side to the Product side for each element. If the equation is balanced, they would be equal.

      Reactant      Product

N        4                    4

H        12                  12

O        10                  6+4 = 10

∴ the equation is balanced.

It is found that a pH of 8 and a temperature of 37°C were most effective for the protease's maximum caseinolytic activity.

With plant leaf extracts at various stages of purification (crude soup is the initial supernatant after homogenization and centrifugation, 40% ammonium soup is the phosphate-dissolved pellet after 40% ammonium sulphate fractionation, and pooled soup is the final collection of pure fractions came from DEAE cellulose column), we have tested the protease activity in terms of caseinolytic activity. Prior to the protease experiment, all three samples were dialyzed to remove EDTA and protease inhibitor. Pure protein's protease activity was tested at various pH values (4–9) and temperatures (4–70°C). Different amounts of -casein were used as substrate for the enzyme activity assay for protease, which was carried out at pH-8 in 37°C according to the ideal conditions established by the preceding studies (ideal temperature and pH).

Here, the enzyme concentration was held constant while the substrate concentration (-casein) changed in the range (0.81, 1.6, 2.4, 4.03, 5.2) mg/ml.

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A yellow-gold sphere has a mass of 15.2 g when passes in the orange liquid with volume 43 mL

Density= mass/volume

Density = 15.2 g/ 43mL

Density = 0.35 g/mL

Question is to find density

4.56g excess reactant is left over when 17.0 g of potassium hydroxide (KOH) reacts with 20.0 g of iron (III) nitrate (Fe(NO₃)₃)

Reactants are raw materials that react with one another and form products.

Here given balanced reaction is

2KOH + Fe(NO₃)₂ → Fe(OH)₂ + 2KNO₃

Then we have to calculated the masses of KOH and Fe(NO₃)₂ from the balanced reaction

Molar mass of KOH = 39+16+1 = 56g/mol

Mass of KOH = 2×56 = 112g

And the molar mass of Fe(NO₃)₂ = 56+2[14+(16×3)]

= 56+2[14 + 48)]

= 56+2[62]

= 56+124

= 180g/mol

Then from the balanced equation

112g of KOH and 180g/mol of  Fe(NO₃)₂

Then the 17 g of KOH = 17×180/112g

= 27.32 g of Fe(NO₃)₂

Then for 20.0 g of iron (III) nitrate

Therefore Xg of KOH = 112×20/180

Xg of KOH = 12.44g

Thus 12.44g of KOH reacted

Therefore we have determine the leftover mass of the excess reactant

Mass of KOH leftover = ?

Mass of KOH leftover = (Mass of KOH given) – (Mass of KOH that reacted)

Mass of KOH leftover = 17 - 12.44g

Mass of KOH leftover = 4.56g

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Balanced equation :

3NaOH + Fe(NO₃)₃⇒ Fe(OH)₃ +  3NaNO₃

Given

Word equation

Required

Balanced equation

Solution

Chemical equations can be expressed in terms of:

Sodium hydroxide reacts with a solution of iron (III)

nitrate to create a solid of iron (III) hydroxide in a solution of

sodium nitrate.

We determine the chemical formula of each compound then we balance the chemical equation

Sodium hydroxide = NaOH

Iron (III)nitrate = Fe(NO₃)₃

Iron (III) hydroxide = Fe(OH)₃

Sodium nitrate = NaNO₃

Reaction

NaOH + Fe(NO₃)₃⇒ Fe(OH)₃ +  NaNO₃

Give a coefficient(most complex compound = 1)

aNaOH + Fe(NO₃)₃⇒ bFe(OH)₃ +  cNaNO₃

Fe, left = 1, right=b⇒b=1

N, left=3, right=c⇒c=3

O, left=a+9, right=3b+3c⇒a+9=3b+3c⇒a+9=3.1+3.3⇒a+9=12⇒a=3

The equation becomes :

3NaOH + Fe(NO₃)₃⇒ Fe(OH)₃ +  3NaNO₃

Answer: B) 10 ml

Explanation:

According to the dilution law,

\(M_1V_1=M_2V_2\)

where,  

\(M_1\) = molarity of  stock \(NaOH\) solution = 1.0 M

\(V_1\) = volume of stock \(NaOH\) solution = 2.0 ml  

\(M_1\) = molarity of dilute \(NaOH\)  solution = 0.20 M

\(V_1\) = volume of diluted \(NaOH\) solution = ?

Putting in the values we get:

\(1.0\times 2.0=0.20\times V_2\)

\(V_2=10ml\)

Therefore, final volume reading is 10 ml

The number of mole of aluminum chloride, AlCl₃ produced when 5 moles of chlorine gas, Cl₂ reacts is 3.33 moles

2Al(s) + 3Cl₂(g) → 2AlCl₃(s)

From the balanced equation above,

3 moles of Cl₂ reacted to produce 2 moles of AlCl₃.

From the balanced equation above,

3 moles of Cl₂ reacted to produce 2 moles of AlCl₃.

Therefore,

5 moles of Cl₂ will react to = (5 × 2) / 3 = 3.33 moles of AlCl₃.

Thus, 3.33 moles of AlCl₃ were obtained from the reaction.

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Answer: The organic reactant is 1,3-propanedithiol. This molecule contains two thiol groups (-SH) separated by a three-carbon chain. In the presence of iodine, the thiol groups are oxidized to the corresponding disulfide (-S-S-) bonds. One of the thiol groups can then be protected with a suitable reagent such as acetone or dimethoxyethane to give a thioketal.

Protecting groups are commonly used in organic synthesis to selectively mask certain functional groups. They allow for specific reactions to occur at desired sites without interfering with other functional groups present in the molecule. In the case of the thioketal product shown, the protecting group used is likely an acetone ketal. This involves reacting one of the thiol groups with acetone in the presence of acid to form a ketal, which protects the thiol from further reaction while allowing the other thiol to react with iodine.

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Answer:

A

Explanation:

at thermal equilibrium, temperature of 2 substances remain constant during heat transfer.

Answer:

A,C

Explanation:

Because the other question deal with convection but A,D show how the warm and cold water travel .

Using a micropipette, pipette 12 µL of the stock solution into the second labeled tube.5. Add 18 µL of nuclease-free water to the second labeled tube to bring the total volume up to 30 µL. This will give a final concentration of 250 ng/µL.

RNA or Ribonucleic acid is the genetic material that helps to transfer genetic information from DNA to protein synthesis. It is essential in decoding and regulation of genes. RNA isolation is the process of extracting RNA molecules from biological samples.The given formula C1V1

= C2V2 states that the concentration (C1) and volume (V1) of the initial solution is equal to the concentration (C2) and volume (V2) of the final solution. This means that the amount of solute (in this case, RNA) before and after dilution is the same. The formula can be used to calculate the volume of the stock solution required to prepare a dilution of a specific concentration.1. Label two new 1.5 mL microfuge tube with your name and RNA sample. Close the lids on them.2. Using a micropipette, pipette 30 µL of your RNA sample into one of the labeled tubes.3. Using the formula C1V1

= C2V2, we can calculate the volume of stock solution required to prepare the dilution.C1

= initial concentration

= unknown V1

= initial volume

= 30 µL (the volume we pipetted)C2

= final concentration

= 250 ng/µLV2

= final volume

= unknown (what we need to find)We can rearrange the formula to solve for V2:V2

= C1V1/C2V2

= (C1V1)/C2V2

= (100 ng/µL × 30 µL) ÷ 250 ng/µLV2

= 12 µL4.

Using a micropipette, pipette 12 µL of the stock solution into the second labeled tube.5. Add 18 µL of nuclease-free water to the second labeled tube to bring the total volume up to 30 µL. This will give a final concentration of 250 ng/µL.

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Answer:

false

Explanation:

metal such as copper, silver, etc conducts heat and electricity. an object such as a rock, plastic, paper does NOT conduct heat.

The thermometer bulb should be placed at the same height as the distillate (the liquid being collected).

The thermometer bulb should be placed at the same height as the distillate (the liquid being collected). This is because the temperature of the distillate is the most accurate representation of the temperature of the vapor being condensed. Placing the thermometer bulb at a different height than the distillate can result in inaccurate temperature readings, which can affect the efficiency and effectiveness of the distillation process.

In fractional distillation, there may be multiple fractions with different boiling points being collected, and the temperature may vary at different points in the fractionating column. In this case, multiple thermometers can be placed at different heights in the fractionating column to measure the temperature accurately at each point. This allows for better control over the separation of the different fractions based on their boiling points.

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Well, each ml of water requires one calorie to go up 1 degree Celsius, so this liter of water takes 1000 calories to go up 1 degree Celsius. (There are 1000 ml, each of which needs to have its temperature raised.)

8 valence electrons in B. That is accurate, indeed. Except for helium, which has just two valence electrons, the final element in each cycle, sometimes referred to as the noble gases, has eight valence electrons.

Valence is a phrase used to describe the emotional energy, either good or negative, attached to a stimulus or event. A stimulus or event is considered to have a high valence if it causes people to feel joy, happiness, or love. On the other hand, something is considered to have a poor valence when it causes others to feel sad, angry, or afraid. Valence can be arbitrary, which means that different people may respond emotionally differently to the same event or stimuli. The desire for good feelings and the avoidance of negative emotions are two universal valence patterns, according to studies. In disciplines like psychology, neurology, and marketing, valence is crucial since it can

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Answer:

opposite

Explanation:

mark me as a brainlist please

Based on the given equation: N₂+ 3 H₂ → 2 NH₃, the mole-to-mole ratios are:

a. N₂/H₂ - 1 : 3

b. N₂/NH₃ - 1 : 2

c. H₂/NH₃ - 3 : 2

KNO3

Based on the given equation: 8 H₂ + S₈ → 8 H₂S,the mole-to-mole ratios are:

a. H₂/H₂S - 1 : 1

b. H₂/S₈ - 8 : 1

3. Based on the given equation: 2 H₂ + O₂ → 2 H₂O

a. The H₂/H₂O mole-to-mole ratio is 1 : 1

b. Suppose you had 20 moles of H₂ on hand and plenty of O₂, the number of moles of H₂O you could make is 20 moles of H₂O.

C. The O₂ / H₂O mole to mole ratio is 1 : 2

d. Suppose you had 20 moles of O₂ and enough H₂, the number of moles of H₂O you could make is 40 moles.

The ratio of the mole quantities of any two compounds present in a balanced chemical reaction is known as the mole ratio. A comparison of the ratios of the molecules required to accomplish the reaction is given by the balancing chemical equation.

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1000 g of water condenses at 100°C in a home radiator (changes from gas to liquid).

Equation

Q=m x Hvap

    where m= mass.

= 1000. gx2260J/g 

Q=2,260,000 J

What is Condensation?

Condensation, which is the opposite of vaporization, is the transformation of matter from its gaseous state into its liquid state. The water cycle is the most frequent use of the phrase. [1] Another way to describe it is as the transformation of water vapour into liquid water when it comes into touch with a solid, liquid, or cloud condensation nucleus in the atmosphere. Deposition is the term for the change that occurs when the gaseous phase directly transitions into the solid phase.

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To make a 1-liter solution with a concentration of 0.5 m, we need to determine the volume of solute and the volume of solvent necessary.

To begin, we need to understand that concentration is determined as mol/L or M. As a result, the number of moles of the solute must be 0.5 mol per liter.
A solution with a concentration of 0.5 mol/L means that 1 liter of the solution contains 0.5 moles of solute.
It's important to remember that the concentration of the solution is given by the following formula:
Molarity (M) = number of moles of solute/volume of solution in liters
M = 0.5 M = x / 1 liter
Number of moles of solute = 0.5 mol
Substitute the values in the above formula
0.5 M = x / 1 liter
x = 0.5 mol
We must know the density of the solvent in order to determine the volume of the solvent. In the absence of this, we cannot determine the volume of the solvent.

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A nitrogen atom in N2O3 has an oxidation number of +3.

The unknown nitrogen oxidation number can be given a variable (x) to ascertain its oxidation number. Since oxygen has an oxidation number of - 2 and there are three oxygen particles in N₂O₃, the complete negative charge from oxygen is (- 2) × 3 = - 6.

The total charge of a compound is equal to the sum of its oxidation numbers. Since the compound in question is neutral, the sum of the oxidation numbers must be zero in this instance.

2(N) + 3(O) = 0

2x + (-6) = 0

2x = 6

x = 3

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Answer:

4 moles of H3PO4

Explanation:

Molar mass of P4O10 = 284 g/mol

Number of moles of P4O10  reacted = 284g/284 g/mol = 1 mole of P4O10

From the reeaction equation;

1 mole of P4O10 yields 4 moles of H3PO4

Hence, 284 g of P4O10 yields 4 moles of H3PO4

Answer:

A is a physical change, no atoms are being lost its still in it original form

B is a chemical change, it is losing atoms and changing into a new substance

Explanation:

Answer: DNA sequencing methods employ chain termination nucleotides. Furthermore, if two chain-terminating nucleotides are employed in the same well, determining which strand is ended by which dideoxynucleotide will be impossible.

(its my own words, but i did search it to get this answer, hope it helps!)

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Answer

1.50 mol

Explanation

Given:

Initial volume, V₁ = 25.0 L

Mass of CH4 gas in 25.0 L container = 40 g

Final volume, V₂ = 15.0 L

From the Periodic Table; molar mass of CH4 = 16.04 g/mol

What to find:

The new amount in mole.

Step-by-step solution:

According to Avogadro’s law: For a confined gas, the volume (V) and number of moles (n) are directly proportional if the pressure and temperature both remain constant. That is:

n₁ = Mass/Molar mass = (40.0g/16.04 g/mol) = 2.493765586 mol

n₂ is the new amount in mole and can be calculated as follows:

The new amount in moles is 1.50 moles