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3 years ago

How does the tilt of earth affect the climate?

1 answer:

3 0

The tilt of the earth provides the earth with seasons. As the earth revolved around the sun different portions (northern or Southern Hemisphere) is exposed more directly to the suns radiation, thus it is hotter in those regions. (Why the United States experiences winter in December but Australia experience summer in December.)

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A 100.0-mL buffer solution is 0.175 M in HClO and 0.150 M in NaClO.Part A: What is the initial pH of this solution?Part B: What

Lelechka [254]

Answer:

Initial pH of this pH = 7.453

pH after addition of 150.0 mg of HBr = 7.35

pH after addition of 85.0 mg of NaOH 0.154 = 7.56

Explanation:

Since Ka value isn't given

so we use Ka value of HClO (hypo chlorous acid) = 3 x 10⁻⁸

pKa = - logKa = 7.52

Part A

Using Henderson equation

pH = pka + log $\frac{[Conjugate base]}{[Acid]}$

pH = 7.52 + log $\frac{0.15}{0.175}$

pH = 7.453

Part B

pH after addition of 150 mg of HBr

moles of HBr

$\frac{Mass}{Molar mass} \\= \frac{150 X10^{-3}g }{80.91} \\= 0.00185 } mole$

Moles of NaOCl in 100 ml buffer solution = $\frac{0.15X100}{1000}$ = 0.015

Moles of HClO in 100 ml buffer solution = $\frac{0.175X100}{1000}$ = 0.0175

Since H⁺ concentration furnished by HBr acid make a common ion effect . So the following reaction carried out

ClO⁻ + H⁺ → HClO

So the remaining concentration of ClO⁻ in solution = 0.015 - 0.000185

= 0.0132

moles of HClO = 0.0175 + 0.00185

= 0.0194

Using Henderson equation pH = Pka + log $\frac{Conjugate base}{Acid}$

= 7.52 + log $\frac{0.0132}{0.0194}$

= 7.35

Part C

pH after addition of 85 mg of HBr

moles of NaOH

$\frac{Mass}{Molar mass} \\= \frac{85 X10^{-3}g }{40} \\= 0.00213 } mole$

So the remaining concentration of ClO⁻ in solution = 0.015 + 0.00213

= 0.0171

Moles of concentration of ClO⁻ = 0.171(M)

moles of HClO = 0.0175 - 0.00213

= 0.0154

Moles in 100 ml Buffer = 0.154(M)

Using Henderson equation pH = Pka + log $\frac{Conjugate base}{Acid}$

= 7.52 + log $\frac{0.171}{0.154}$

= 7.56

3 0

3 years ago

Which section of a lab report would most appropriately contain the possible sources of error in an experiment?

Vlad1618 [11]

The lab report contains the theory, process, data and calculation of the experiment. The theory and process are remains fixed for a particular experiment. Thus there is no chance to get error from these two part. The calculation depends upon the reading or data of the experiment. The calculation is also unique and based on the data. Thus the error come from the data of the experiment. As for example for a titration experiment the data recorded in the process from the burret is the source of error, on which the calculation depends.

7 0

4 years ago

1. The sodium-iodide symporter plays a role in the accumulation of iodide in the thyroid gland. Here, one iodide gets converted

Serggg [28]

Answer:(1) 6 sodium ions

(2)The movement of iodide ions occurs in the same direction as the sodium ions.

Explanation: Sodium-iodide symporter actively transports 2 sodium ions together with one iodide ions across the basement membrane into the thyroid follicular cells.(therefore for production of a single molecule of T3 3×2=6 sodium ions)This system utilises the concentration of sodium ions so that iodide ions can move against its concentration gradient.

6 0

3 years ago

The atoms and molecules in a gas are in constant motion. Temperature is a measure of this motion. How are these related? As temp

Sedaia [141]

Here we have to choose the correct statement on the effect of temperature on the motion of the molecules and atoms of a gas.

As the temperature increases the molecules and atoms move faster.

As per the kinetic theory of gas molecules and atoms the kinetic energy (K.E.) of the atom or molecules is related to temperature by the equation

K.E. = $\frac{3}{2}$ kT ( k = Boltzmann constant, T = temperature.

Thus as the temperature increases the K.E. increases thus the atom or molecules move faster.

With the decrease of temperature the movement of the atoms or molecules will be less and they will be near to each other.

The increment of temperature increase the K.E. thus the atoms or molecules move apart from each other.

With the decrease of temperature the movement of the atoms or molecules decreases.

8 0

4 years ago

Check out this app! It's millions of students helping each other get through their schoolwork. https://brainly.app.link/qpzV02Ma

marishachu [46]

Answer:

why did you post a link to brainly when we are on brainly already??????

Explanation:

8 0

3 years ago