If I have a sample of N=200, how many scores should I expect to find between z=−1.25 and z=+1.25? 3. A Clinical Psychologist has a population of patients with depression. She tests all her patients using a survey instrument meant to measure depression symptom severity and the results of the survey was a mean M=30 and a SD=6. If she decides to place one patient on a new medication and after some time tests that patient on the same survey and he scores a X=18. What is the probability that his score is from the original distribution?

Answer: The answer is true

Explanation:

Answer:

c is correct answer my girl f

Fe + O₂ → Fe₂O₃

19.52 moles of oxygen gas would be needed to react completely with 9.76 moles of iron according to the equation.

Oxygen gas is a form of oxygen (O2) that exists as a gas at standard temperature and pressure. It is an important component of the Earth's atmosphere, making up 21% of the air we breathe.

Oxygen is produced by photosynthesis in plants and by the process of respiration in animals. In addition, oxygen is used in many industrial processes, such as welding and other forms of combustion. Oxygen is also used in medical applications, such as in oxygen therapy and in medical devices such as ventilators.

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The quantity of grams of oxygen gas that will be needed to react completely with 9.76 moles of iron according to the equation above would be = 624.64g

From the above equation;

1 mole of Fe reacted with 2 moles of oxygen

9.76 moles of Fe would react with X moles of oxygen.

That is;

1 mole Fe = 2 moles oxygen

9.76 mole Fe = X moles of oxygen

Make X the subject of formula;

x = 9.76× 2

X = 19.52 moles of oxygen.

But 1 mole of oxygen = 32 g

19.52 moles = X

Make X the subject of formula:

X = 32×19.52 = 624.64g.

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The correct option is B, A first-order reaction has a rate constant of 0.33 min-1. it takes a min for the reactant concentration to decrease from 0.13 m to 0.066 m is 2.1 min.

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

We are given that k = 0.33 \(min^{-1\), [A]0 = 0.13 M, and [A]t = 0.066 M. We need to find the time, t.

Plugging in the given values, we get:

ln(0.066/0.13) = -(0.33 \(min^{-1\)) t

Simplifying the left side:

ln(0.5) = -(0.33 \(min^{-1\)) t

Solving for t:

t = -ln(0.5)/0.33 \(min^{-1\)

t = 2.1 min

A rate constant is a proportionality constant that relates the rate of a chemical reaction to the concentration of the reacting species. It is a key parameter used to describe the kinetics of a chemical reaction and is typically denoted by the symbol "k." The rate constant is determined experimentally and can vary depending on the specific reaction conditions.

The rate constant reflects the probability that a reaction will occur between two molecules when they collide. It is influenced by several factors, including temperature, pressure, and the presence of catalysts. Generally, as the temperature increases, the rate constant also increases due to the increase in kinetic energy of the molecules. The rate constant can also be affected by the activation energy required for the reaction to occur, which is the minimum amount of energy required for reactant molecules to collide and form products.

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ANSWER

EXPLANATION

Firstly, we need to define the word titration.

Titration is defined as a technique that is used to determine the known concentration of an unknown solution.

This normally occurs between an acid and a base

During titration, an indicator changes color when equilibrium has been attained between the two solutions. The solutions are normally acid and base. At equilibrium, the number of moles of acid is equal to the number of base.

Therefore, the correct answer is option C

The molar solubility of yttrium fluoride (YF3) is 3.46 × 10-6 M.

The ksp of yttrium fluoride is 8.62 × 10-21. The molar solubility of this compound can be determined using the following formula:Ksp = [Y3+][F-]3We can set the molar solubility of yttrium fluoride as 'x'.

This is because the solubility of the yttrium fluoride will lead to the concentration of yttrium ions and fluoride ions. The Ksp expression for yttrium fluoride can be represented as follows:

Ksp = (x)(3x)3 = 27x4

where '3x' is the molar solubility of F-.

We can substitute Ksp value in the above expression and then solve for x:

8.62 × 10-21 = 27x4x = 3.46 × 10-6 M

Thus, the molar solubility of yttrium fluoride is 3.46 × 10-6 M.

To conclude, the molar solubility of yttrium fluoride (YF3) is 3.46 × 10-6 M.

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The final temperature of the bomb calorimeter is 30.9°C.

Combustion reactions are those reactions in which a compound completly decompose in to carbon dioxide and water molecule.

The final temperature will be calculated by using the equation:

Q = mc(T₂ – T₁), where

Q = relesed heat from calorimeter = 24kJ = 24000J

m = mass of calorimeter = 1.30kg = 1300g

c = specific heat of calorimeter = 3.41 J/(g°C)

T₁ = initial temperature of calorimeter = 25.5°C

T₂ = final temperature of calorimeter = to find?

On putting all these values on the above equation and calculate for T₂, we get

T₂ = 24000/(1300)(3.41) + 25.5

T₂ = 30.9°C

Hence, correct option is (1) i.e. 30.9°C.

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Answer:

30.9

Explanation:

right on edge 2022

Answer: 137.76 g

Explanation:

Answer:

An adaptation occurs if a mutation helps an individual survive and reproduce.

Explanation:

Over generations, the mutation will become more common. An adaptation occurs if a mutation isn't passed on to offspring. Hope this helps! xx

Answer:

The rollercoaster has the lowest kinetic energy at the top of the hill.

The rollercaoster has the highest kinetic energy at the bottom of the hill.

Explanation:

The kinetic energy of any solid body in motion is usually computed using this formula:

K.E = \(\frac{1}{2}mv^2\)

From this, we can see that it varies based on two major parameters - The mass of the moving object and the velocity of the moving object.

We can assume that the mass of the rollercoaster is constant since no one gets off and it does not shrink in its size during the ride.

This means that the variations in the K.E are mainly coming from its velocity.

At the top of the hill, the rollercoaster is moving at its slowest pace. hence, it has the lowest kinetic energy at the top of the hill.

However, at the bottom of the hill, the rollercoaster is moving its fastest, hence it has the highest kinetic energy at the bottom of the hill.

Answer:

law of conservation

Explanation:

matter cannot be destroyed nor made

Answer:

--------------------------------------------------

Answer:

Explanation:

Solution

verified

Verified by Toppr

Correct option is B)

HCl+NaOH→NaCl+H

2

​

O

In this chemical reaction, the molar ratio is 1:1 between HCl and NaOH.

So, moles of HCl = moles of NaOH

M

HCl

​

× Volume of HCl = M

NaOH

​

× Volume of NaOH

M

HCl

​

=

volumeofHCl

M

NaOH

​

×volumeofNaOH

​

M

HCl

​

=

50.00ml

25.00ml×1.00M

​

M

HCl

​

=0.50MHCl

So, the concentration of HCl is 0.50M.

Video Explanation

Answer:

Kelp --> sea urchin --> sea otter

Answer:

positive

Explanation:

protons have a positive charge

Answer:

Positive

Explanation:

Since the revolution, the moth's white colour can no longer blend in with the trees. The moths' white wings turn ash brown as a result of a genetic mutation brought on by pollution. The moths are protected from predators by the wings, which blend very well with the surrounding trees.

Natural selection is a technique used to adapt and transform populations of living things. People in a population are naturally diverse, which means that every person is distinctive in some ways. This variation shows that some people have traits that make them better matched to their environments than others.

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Answer:

89.3 %

Explanation:

M(CH4) = 12+ 4*1 = 16 g/mol

M(O2) = 2*16 = 32 g/mol

M(CO2) = 12 + 2*16 = 44 g/mol

8.50 g * 1 mol/16 g = 0.5313 mol CH4

15.9 g * 1 mol/32 g = 0.4969 mol O2

9.77 g * 1 mol/44 g = 0.2220 mol CO2

1)                                  CH4        + 2O2 -----> CO2 + 2H2O

from reaction             1 mol          2 mol

given                       0.5313 mol   (0.4969 mol)

1 mol CH4              --- 2 mol O2

0.5313 mol  CH4  --- x mol O2

x= 2*0.5313 = 1.0626 mol O2

We can see that for given amount of CH4 we do not have enough O2, so O2 is a limiting reactant.

2)                               CH4        + 2O2 -----> CO2 + 2H2O

from reaction                             2 mol        1 mol

given                                      0.4969 mol   x mol

x = 0.4969*1/2 = 0.2485 mol CO2 theoretical yield

3)

Practical yield CO2 = 0.2220 mol

Theoretical yield CO2 = 0.2485 mol

% yield = (0.2220/0.2485)*100% = 89.3 %

Answer:

19.5%

Explanation:

the air required for human breathing is 19.5 percent.

Answer:

HOPE IT HELPS THANK ME LATER.

The ion that has 26 protons, 28 neutrons, and 24 electrons is Iron (Fe) (option c).

An element can be determined by the number of protons in the nucleus of its atom. The number of protons present in an atom is referred to as the atomic number of the element.

This means that the number of protons in an atom is unique to a specific element.

Iron (Fe) has 26 protons in the nucleus of its atom.

Therefore, an ion with 26 protons is an ion of the element iron (Fe).

Magnesium (Mg) has 12 protons, Chromium (Cr) has 24 protons, Xenon (Xe) has 54 protons and Nickel (Ni) has 28 protons.

Thus, an ion which has 26 protons, 28 neutrons, and 24 electrons  is Fe (option c)

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Answer:

solid liquid and gas

Explanation:

ice is a solid then it melts to liquid and evaporates into gas

Answer:

Snow is basically water;

ice/snow is solid state

water is liquid state

vapour is gaseous state

Explanation:

Answer:  The correct answer is:  " 0.54 g " .

__________________________________________

Explanation:

Note that "hydrogen gas" is:  

H₂ (g)  ;   that is:  a "diatomic element" (diatomic gas) ;

_________________________________________

The molecular weight of "H" is:  1.00794 g ;

   (From the Periodic Table of Elements).

So, the molecular weight of:  H₂ (g)  is:

    " 1.00794 g * 2  = 2.01588 g ; {use calculator) ;

_________________________________________

Note the conversion for a gas at STP:

______

  1 mol of a gas = 22.4 L gas;

___

i.e. " 1 mol / 22.4 L " ;

____

So:     " 5.7 L H₂ (g)  \(* \frac{1 mol H_{2} }{22.4 L} *\frac{2.01588 g}{mol} =? ;\)

The "L" ("literes" cancel out to "1" ;  since "L/L = 1 ;

The "mol" (moles) cancel out to "1" ; since "mol/mol = 1 ;

____

and we are left with:

____

 [5.7 * 2.104588 g ] / 22.4  =  ?  g ;

______________________

→ [ 11.9961516  g ] / 22.4 =

          0.53554248214  g ;l

_____________________________

We round this value to:  " 0.54 g " ;

 → since "5.7 L " has 2 (two) significant figures;  

     22.4 is an exact number conversion;

     and "5.7 L" has fewer significant figures than:

    " 2.104588 " ; or:  " 1.00794 " .

  → as such: We round to "2 (two) significant figures."

______________________________

Hope this is helpful.  Wishing you the best in your academic endeavors!

_______________________________

Answer:

it is converted to kinetic energy

The strongest type of intermolecular force between solute and solvent in the solution of CH\(_{3}\)Cl (g) in CH\(_{3}\)OCH\(_{3}\) (g) is dipole-dipole interaction.

In  CH\(_{3}\)Cl, the molecule has a polar covalent bond between carbon and chlorine atoms. Chlorine is more electronegative than carbon, resulting in a partial negative charge on chlorine and a partial positive charge on carbon. In  CH\(_{3}\)OCH\(_{3}\) , the molecule is also polar due to the oxygen atom's higher electronegativity compared to carbon and hydrogen. This creates a dipole moment in both molecules.

In the solution, the positive end of the  CH\(_{3}\)Cl molecule interacts with the negative end of the  CH\(_{3}\)OCH\(_{3}\) molecule, forming dipole-dipole interactions. These intermolecular forces are stronger than London dispersion forces, which are present in all molecules but are typically weaker. Therefore, the strongest intermolecular force in this solution is dipole-dipole interaction.

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Answer:

The formation of a precipitate

Explanation:

took thecquiz on edge. got it correct

The formation of a precipitate is a evidence that a chemical reaction has likely occurred.

A chemical reaction is a process in which chemical bonds between atoms to break and reorganize, to form other new substances.

Now lets check all option one by one

Option (A): a liquid slowly losing volume

Here change in volume occurred which is not a evidence of a chemical reaction.

So it is incorrect option.

Option (B): the formation of a precipitate

Here formation of precipitate is a evidence of a chemical reaction.

So it is correct option.

Option (C): boiling water releasing steam

Here formation of evaporation takes places which is not a evidence of a chemical reaction.

So it is incorrect option.

Option (D): a change in the shape of solid.

Here change in shape occurred which is not a evidence of a chemical reaction.

So it is incorrect option.

Thus, from we can say that the formation of a precipitate is a evidence that a chemical reaction has likely occurred.

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Answer:

to give off positive vibes <3

Explanation:

Answer:

Some examples of homoatomic molecules are hydrogen gas, and oxygen gas and some examples of heteroatomic molecules are water, methane

Explanation:

The appropriate structure for a compound with the molecular formula C8H14O3 that displays the provided IR and NMR spectra is 3-methylbutanoic acid.

The IR and NMR spectra of a compound with the molecular formula C8H14O3 were provided. The question is asking for the appropriate structure for the compound.

The IR spectrum displays a broad peak at 3300 cm⁻¹ and a strong peak at 1730 cm⁻¹, while the NMR spectrum shows signals at δ 0.9 (t, 3H), 1.2 (d, 6H), 2.0 (t, 2H), 2.3 (s, 3H), and 4.1 (q, 1H).The formula of the compound, C8H14O3, reveals that the molecule contains eight carbon atoms, fourteen hydrogen atoms, and three oxygen atoms. Based on the information from the spectra and the molecular formula, the appropriate structure of the compound can be proposed.

According to the NMR spectrum, there are signals at δ 0.9 (t, 3H), 1.2 (d, 6H), 2.0 (t, 2H), 2.3 (s, 3H), and 4.1 (q, 1H). The signals at δ 0.9 and 1.2 are consistent with methyl (CH3) and methylene (-CH2-) groups. The signal at δ 2.0 is consistent with a methylene group adjacent to a carbonyl group (-CH2-CO-). The singlet at δ 2.3 is consistent with a methyl group (-CH3), while the signal at δ 4.1 is consistent with a methine group (-CH-).From the IR spectrum, there is a broad peak at 3300 cm⁻¹, which is indicative of an alcohol group (-OH), and a strong peak at 1730 cm⁻¹, which is indicative of a carbonyl group (C=O).

These two functional groups are present in the same molecule, suggesting that it is a carboxylic acid. The proposed structure of the compound with the molecular formula C8H14O3 and the given IR and NMR spectra is:

Therefore, the appropriate structure for a compound with the molecular formula C8H14O3 that displays the provided IR and NMR spectra is 3-methylbutanoic acid.

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A diprotic weak acid is an acid that has two replaceable hydrogen atoms. The acid will then undergo two dissociations to produce two hydrogen ions. As a result, the acid's reaction with bases is more complex, and it is dependent on the concentration of acid and pH.

A diprotic weak acid is an acid that has two replaceable hydrogen atoms. The acid will then undergo two dissociations to produce two hydrogen ions. As a result, the acid's reaction with bases is more complex, and it is dependent on the concentration of acid and pH. When titrated, the following data must be considered: the concentration of the acid, the concentration of the base, and the pKa values of the acid. The equivalent point is the point in titration where the number of moles of acid is equal to the number of moles of base added to it. In a titration curve, the first equivalence point is determined by the point where the initial amount of diprotic acid is neutralized. It's the point where the base added to the acid neutralizes all the H+ present in the solution.

The amount of strong base required to reach the first equivalence point can be calculated as follows: As per the equation, 1 mole of diprotic acid releases two moles of hydrogen ions, which means that to neutralize one mole of acid, you will require two moles of strong base. Therefore, you would require two moles of strong base to reach the first equivalence point in a titration curve. The pKa of the second titratable hydrogen would be equal to the pH at the halfway point between the two equivalent points. As a result, the amount of strong base required to reach the pH equivalent to the pKa of the second titratable hydrogen is also equal to the amount required to achieve the halfway point between the two equivalence points.

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