Question 1: A new fat-burning pill for men is introduced. To test for effectiveness, 50 men are given the pill and 50 men are given a placebo. After 6 months, the men's body fat percentage is calculated. Identify the control group, the manipulated variable, and the responding variable. Explain how you can identify each.

Answer:

Explanation:

When Iron is dipped in Aluminium Chloride, a redox reaction occurs. Basically iron reacts with Chloride ion and forms a solid precipitate of Aluminium.

End result :Iron (II) Chloride forms and Aluminium forms the precipitate

The solvent level has to be below the starting line of the TLC, otherwise, the spots will dissolve away.

The solvent is a substance, ordinarily, a liquid, in which different materials dissolve to form a solution.

The term 'solvent' is carried out to a large number of chemical materials which are used to dissolve or dilute different substances or substances. they are typically organic beverages. Many solvents also are used as chemical intermediates, fuels, and as components of a wide variety of merchandise.

Due to its polarity and potential to form hydrogen bonds, water makes an outstanding solvent, which means that it is able to dissolve many different sorts of molecules. A solvent is a substance that dissolves a solute, resulting in an answer. A solvent is mostly a liquid but can also be a strong, a fuel, or a supercritical fluid.

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Amoeba are those Organisms which reproduce through binary fission.

Amoebae are those  organisms reproduce through binary fission. Therefore, option B is correct.

Binary fission is an asexual reproduction mode. The nucleus of the parent cell divides during binary fission, followed by cytoplasmic division and the formation of two new daughter cells.

It can be found in unicellular organisms such as amoeba and paramecium. Binary fission means "division into two". It is the most basic and widely used method of asexual reproduction.

Amoeba is a unicellular organism that reproduces through binary fission, just like bacteria. The cell divides into two equal-sized daughter cells after replicating its genetic material via mitotic division. Two identical individuals are produced from a single parent cell using this method.

Thus, option B is correct.

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Balanced equation:

4 NH3 + 5 O2 = 4 NO + 6 H2O

Answer:

6.6M

Explanation:

C=concentration

V=Volume

C1V1=C2V2

rearrange formula to find C2

(C1V1)/V2= C2

(12M x 550mL)/1000mL= C2

6600M*mL*/1000*mL* =C2 (cancel units)

6.6M=C2

Answer:

what do u need help with?

Explanation:

What's the question

Answer:

hope u umderstood ! if explanation needed then conta t

Nitrogen and hydrogen react to form ammonia and is a combination reaction. The grams of hydrogen used in the reaction with nitrogen to form ammonia is 2.0 grams.

Mass is the weight or the product of the volume and density of the substance. It can be calculated as, \(\rm volume \times density.\)

Given,

Mass of nitrogen = 10.0 grams

Mass of ammonia = 12.0 grams

Mass of hydrogen = x gram

Solving for x:

\(\begin{aligned}\rm 10 + x &= 12\\\\\rm x &= 12.0 - 10.0\\\\&= 2.0 \;\rm grams\end{aligned}\)

Therefore, 2.0 grams of hydrogen is required to react with 10.0 grams of nitrogen to produce 12.0 grams of ammonia.

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Answer:

¹₀P

Explanation:

 Nuclear reaction:

                ⁹₄Be  + ⁴₂He  → ¹²₆C + ?

To balance this equation, as with other combining specie, the mass number on both sides of the expression must be the same. Also, the atomic number must be the same.

   Let us represent the unknown by X;

          ⁹₄Be  + ⁴₂He  → ¹²₆C + ᵇₐX

 Now;

  Sum of mass number;

            9 + 4 = 12 + b

               13 = 12 + b

                    b = 1

   Sum of atomic number;

             4 + 2  = 6 + a

               a = 0

So the specie is a position ¹₀P

Explanation:

Sand is a common material found on beaches, deserts, stream banks, and other landscapes worldwide. In the mind of most people, sand is a white or tan, fine-grained, granular material. However, sand is much more diverse - even beyond the pink sand beaches of Bermuda or the black sand beaches of Hawaii.

The NBS (N-bromosuccinimide) bromination of cyclohexa-1,4-diene can result in the formation of two different products due to the presence of two different reactive positions (double bonds) in the starting material. The reaction can occur at either one or both of these positions.

Here are the possible products:

1. 1-Bromo-1,4-cyclohexadiene:

   H   H Br

   |    |    |

H-C=C-C=C-C-H

   |   |     |

  H  Br  H

2. 1-Bromo-1,2-cyclohexadiene:

   H  Br H

    |   |    |

H-C=C-C=C-C-H

    |    |   |

    H  H  Br

In the first product, bromination occurs at the 1,4-positions of the cyclohexadiene, while in the second product, bromination takes place at the 1,2-positions. Remember that the double bonds are depicted as lines, and the superscripts indicate the bromine atom attached to the respective carbon atoms.

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Answer:A heating curve graphically represents the phase transitions that a substance undergoes as heat is added to it. The plateaus on the curve mark the phase changes. The temperature remains constant during these phase transitions.

there, so you can have choices, though they all mean the same thing.

Separation of mixtures is the process of isolating and purifying individual components from a mixture. It has a wide range of applications in various fields, including chemistry, biology, and environmental science. Here are ten beneficial effects of separation of mixtures:

Helps to obtain pure substances: Separation of mixtures helps in obtaining pure substances, which are essential for research and industrial processes.

Enables identification of individual components: Separation of mixtures allows the identification and characterization of individual components in a mixture.

Allows the removal of impurities: Separation of mixtures can be used to remove impurities from a mixture, which can improve the quality of the final product.

Facilitates recycling: Separation of mixtures is crucial for recycling materials such as plastic, paper, and metals.

Enables selective extraction: Separation of mixtures can be used to selectively extract specific components from a mixture.

Helps in drug development: Separation of mixtures is important in drug development, where pure compounds are required for testing and clinical trials.

Helps in forensic analysis: Separation of mixtures is used in forensic analysis to identify and analyze evidence.

Facilitates food processing: Separation of mixtures is used in the food industry to extract and purify ingredients.

Enables the production of clean energy: Separation of mixtures is used in the production of clean energy, such as separating hydrogen from other gases.

Helps in environmental remediation: Separation of mixtures is used in environmental remediation to separate and remove pollutants from soil, water, and air.

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Answer:

13.00 \(dm^{3}\)

Explanation:

At S.T.P one mole of any gas requires 22.414 \(dm^{3}\).

By setting up mole ratio between moles and volume;

         moles    :     volume

             1         :      22.414

            0.58    :         X

 X = 0.58 x 22.414

 X = 13.00 \(dm^{3}\)

Answer:

it helps prove the fact or opinion and test that and archive it

The correct statement about the Michaelis-Menten constant (Km) is b. A high Km means weak binding, whereas a small Km means tight binding.

Km is a parameter in enzyme kinetics that represents the substrate concentration at which the reaction rate is half of the maximum rate (Vmax). It reflects the affinity of the enzyme for its substrate. A high Km indicates weak binding between the enzyme and substrate, meaning that the enzyme requires a higher concentration of the substrate to achieve half of its maximum activity. In this case, the enzyme has a lower affinity for the substrate. Conversely, a small Km indicates tight binding between the enzyme and substrate, meaning that the enzyme requires a lower concentration of the substrate to achieve half of its maximum activity. In this case, the enzyme has a higher affinity for the substrate. Therefore, option b is the correct statement about the Michaelis-Menten constant (Km).

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Alcohols on Reaction with PBr₃ in the presence of DMF (Polar Aprotic solvent) undergo SN² reaction to alkyl bromides with inversion of configuration.

Alcohols on reaction with pyridine produces alkyl chloride as the products. The cyclohexanol reacts with PBr₃ in DMF undergoes SN² reaction to form the product with inversion of configuration.

There are many methods to prepare alcohols in the industries and also in the laboratories.

The asymmetric alcohols on reaction with SOCl in the pyridine produces alkyl chloride with the inversion of configuration through SN² pathway.

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The volume of the residual gas, which is oxygen, would be  15cm³.

Hydrogen and oxygen gas react to form water according to the following chemical equation:

\(2H_2 + O_2 -- > 2H_2O\)

The ratio of hydrogen to oxygen to water formed is 2:1:1.

Considering the volume ratio, 10cm³of hydrogen gas should require cm³5cm³ of oxygen gas while 5cm³ of water would be formed.

In other words, the remaining volume of oxygen would be:

20 - 5 = 15 cm³

In summary, the volume of the residual oxygen would be 15cm³.

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Answer:

43 protons and 99 neutrons.

Explanation:

Answer:

122.5 Joule, or 122.5 j

Explanation:

Given,

mass of the object (m) = 5 kg

velocity of the object (v) = 7 m/s

Kinetic energy = \(\frac{1}{2}\) × m × v²

Applying the formula:

Kinetic energy = \(\frac{1}{2}\) × 5 × 7²

⇒ \(\frac{1}{2}\) × 5 × 7 × 7

⇒ \(\frac{245}{2}\)

⇒ 122.5 Joule, or 122.5 j

Kinetic energy is the energy that an object gains as the result of the motion.  It also depends on the mass of the object and force with which the motion is applied.  In the given question, the mass of the object is 5 kg and the force of the velocity by which it is moving is 7 m/s.

Answer:

The middle Hydrogen atom is bonded to two instead of one atom

Oxygen is bonded to one instead of two atoms

Oxygen has three instead of two lone pairs of electron.

Explanation:

If we look at the structure, we will notice that it does not satisfy the basic principles of valency.

Hydrogen has a valency of 1. However, the middle hydrogen atom is bonded to two atoms instead of only one atom - the other atom of hydrogen and an atom of oxygen.

Secondly, oxygen has three lone pairs instead of two lone pairs, hence it is bonded to only one instead of two atoms. This does not correspond to the known valency of oxygen.

The structure does not obey the valence rule. From the structure, it is impossible for the hydrogen atom to bond to more than one atom.

The valence rule posits that an atomic element has the ability to gain or lose the maximum number of electrons in its outermost shell.

From the information, the hydrogen is bonded to a hydrogen atom and singly bonded to another oxygen atom.

This does not conform to the rule of valence electrons and therefore affects the stability of the hydrogen atom because the hydrogen has the ability to bond to only one atom and not two different atoms.

Therefore, we can conclude that the structure does not obey the valence rule and hydrogen can only bond to one atom at a time.

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Answer:

D

Explanation:

Erosion is when rocks or sediments are moved around by those means mentioned.

Answer:

Niobium (Columbium)

Explanation:

Specific heat capacity has the units J/(kg °C). To find the heat capacity, all we need to do is organize the values so the units match up.

1200 J / (0.03 kg * 150°C) = 266.67 or 267 J/(kg °C)

The closest metal to a 267 heat capacity is Niobium I believe.

the answer is 17.031 g/mol

Answer:

17.031 g/mol

Explanation:

hard to explanation

Answer:

Those people could sustain on Mars, by living closer to the poles

Explanation:

As it is given that caps involve the water ice instead of the carbon dioxide

And, current observations of spectrum analyzed that the polar caps are totally different from one other i.e northern one involves more water ice while on the other hand,  the southern one involves most of the carbon dioxide

Moreover, the astronomers unable to see to spectrum portions as the atmosphere absorbs the wavelength

So we conclude that the people could survive on mars if they live near to poles

It would take approximately 17.2 hours for the concentration of N2O5 to decrease by 86.0% in the given vessel.

To calculate the time it takes for the concentration of N2O5 to decrease by 86.0%, we need to use the first-order rate equation:

ln([N2O5]t/[N2O5]0) = -kt

Where [N2O5]t is the concentration of N2O5 at time t, [N2O5]0 is the initial concentration of N2O5, k is the rate constant, and t is the time.

Rearranging the equation to solve for t, we get:

t = (ln([N2O5]t/[N2O5]0))/(-k)

Since the reaction is first-order, the rate constant can be determined from the half-life of the reaction using the equation:

t1/2 = ln2/k

where t1/2 is the half-life.

Given that the concentration of N2O5 decreases by 86.0%, the final concentration ([N2O5]t) is:

[N2O5]t = 0.14[N2O5]0

Substituting the given values into the equation for t, we get:

t = (ln(0.14))/(-k)

To determine k, we need to find the half-life of the reaction. Since the reaction is first-order, the half-life can be calculated using the equation:

t1/2 = ln2/k

Substituting the given concentration of N2O5 and the rate constant into the equation, we get:

t1/2 = (ln2)/k = (ln2)/(2.303*0.108) = 5.45 hours

Finally, substituting the values for k and t1/2 into the equation for t, we get:

t = (ln(0.14))/(-0.108)

t = 17.2 hours

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Answer:

107.9

Explanation:

The molarity of the base used in the experiment, which was determined based on the recovered NaCl and the volumes of hydrochloric acid and sodium hydroxide, was approximately 1.15 M.

To determine the molarity of the base used in the experiment, we need to use the stoichiometry of the balanced chemical equation and the given data.

The balanced chemical equation for the reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH) is:

HCl + NaOH → NaCl + H2O

First, we need to find the number of moles of NaCl produced. We can do this by using the given mass of NaCl (2.22 g) and its molar mass (58.44 g/mol):

moles of NaCl = mass of NaCl / molar mass of NaCl

moles of NaCl = 2.22 g / 58.44 g/mol

moles of NaCl = 0.038 moles

Next, we can use the stoichiometry of the balanced equation to determine the number of moles of NaOH that reacted. Since the mole ratio between NaCl and NaOH is 1:1, the number of moles of NaOH is also 0.038 moles.

Now, we can calculate the molarity of the base (sodium hydroxide) using the given volume of sodium hydroxide solution (0.033 L):

Molarity of NaOH = moles of NaOH / volume of NaOH solution

Molarity of NaOH = 0.038 moles / 0.033 L

Molarity of NaOH ≈ 1.15 M

Therefore, the molarity of the base used in the experiment is approximately 1.15 M.

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