Measurements show that the pH of a particular lake is 4.0. What is the hydrogen ion concentration of the lake?

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#Question id: 4135

#XL - T Zoology

In the “activation” of an amino acid for protein synthesis:

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#Question id: 194

#XL - T Zoology

Which does not return to its original form after each catalysis?

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#Question id: 8925

#XL - P Chemistry

What is the probable sequence in which the following clades of animals originated, from earliest to most recent?

1. tetrapods

2. vertebrates

3. deuterostomes

4. amniotes

5. bilaterians

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#Question id: 12668

#XL - R Botany

What will be the effect of  water deficit condition in the plant cell?

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#Question id: 20248

#XL - P Chemistry

C (s) + O2 (g) →CO2, (g); DH = –94.3 kcal/mol

CO (g) + O2(g) → CO2 (g); DH = – 67.4 kcal/mol

O2(g) → 2O (g); ΔH = 117.4 kcal/mol

CO (g) → C (g) + O(g) ; ΔH = 230.6 kcal/mol

Calculate ΔH for C (s) → C (g) in kcal/mol.