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3 years ago

All rocks are made up of?

Chemistry

2 answers:

Romashka-Z-Leto [24]3 years ago

6 0

Answer:

not all rocks are made in the same type u sedamintory and lava rocks and marbel rocks but thier all made by stone

Sindrei [870]3 years ago

6 0

Answer:

The Earth is covered in a layer of solid rock called the crust. Rocks are either SEDIMENTARY , IGNEOUS, or METAMORPHIC. Almost all rocks made of minerals, but different rocks contain different mixtures of minerals.

Explanation:

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Carbonic anhydrase is a zinc-based enzyme that catalyzes the conversion of carbon dioxide to carbonic acid. In an experiment to

Contact [7]

Answer:

$k=1.12x10^{-4}s$

Explanation:

Hello,

By considering the rate law:

$ln(\frac{[CO_2]}{[CO_2]_0} )=-kt\\$

Solving for the time, we've got:

$k=-\frac{ln (\frac{[CO_2]}{[CO_2]_0 })}{t}\\\\k=-\frac{ln(\frac{56.0mmol*dm^{-3} }{220mmol*dm^{-3} })}{1.22x10^{4}s }\\ \\k=1.12x10^{-4}s$

Best regards.

8 0

3 years ago

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

The Earth's hours is it spinning on its axis, and it takes 24

SVETLANKA909090 [29]

Answer:

yes? is there a question...

Explanation:

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4 years ago

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Need help, I'm kinda panicking!

allochka39001 [22]

Answer:

hey I saw this on brainly and thought it will help u..

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and hope this is what ur looking for.

4 0

2 years ago

Do females take longer to eliminate alcohol than male, even though they might be the same weight ?

natita [175]

The answer to this question is false

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3 years ago

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