1. A normal body temperature is 37^∘C, Kw=2.4 × 10^-14. Calculate [H3O^+]and [OH^-]for the body

### Question 1: Calculate (left[mathrm{H}_{3} mathrm{O}^{+}right]) and (left[mathrm{OH}

Question

1. A normal body temperature is \( 37^{\circ} \mathrm{C}, \mathrm{K}_{\mathrm{w}}=2.4 \times 10^{-14} \). Calculate \( \left[\mathrm{H}_{3} \mathrm{O}^{+}\right] \)and \( \left[\mathrm{OH}^{-}\right] \)for the body fluid at this temperature. A. \( \left[\mathrm{H}_{3} \mathrm{O}^{+}\right]=\left[\mathrm{OH}^{-}\right]=2.5 \times 10^{-7} \) B. \( \left[\mathrm{H}_{3} \mathrm{O}^{+}\right]=\left[\mathrm{OH}^{-}\right]=1.5 \times 10^{-8} \) C. \( \quad\left[\mathrm{H}_{3} \mathrm{O}^{+}\right]=\left[\mathrm{OH}^{-}\right]=1.5 \times 10^{-6} \) D. \( \quad\left[\mathrm{H}_{3} \mathrm{O}^{+}\right]=\left[\mathrm{OH}^{-}\right]=1.5 \times 10^{-7} \) 2. Atoms of elements in a group on the Periodic Table have similar chemical properties. This similarity is most closely related to the atoms'. A. number of principal energy levels B. number of valence electrons C. atomic numbers D. atomic masses 3. How many atoms of \( \mathrm{Cu} \) are present in \( 35.4 \mathrm{~g} \) of \( \mathrm{Cu} ?\left[\mathrm{Cu}=63.5 \mathrm{gmol}^{-1}\right] \) A. \( 1.08 \times 10^{24} \) atoms of \( \mathrm{Cu} \) B. \( 3.27 \times 10^{23} \) atoms of \( \mathrm{Cu} \) C. \( 6.02 \times 10^{23} \) atoms of \( \mathrm{Cu} \) D. \( 1.20 \times 10^{22} \) atoms of \( \mathrm{Cu} \) 4. How would you prepare \( 250 \mathrm{~cm}^{3} \) of \( 0.25 \mathrm{M} \) aqueous solution of \( \mathrm{NaCl} \) ? \( \left[\mathrm{Na}=23 \mathrm{~g} \mathrm{~mol}^{-1} ; \mathrm{Cl}=35.5 \mathrm{~g} \mathrm{~mol}^{-1}\right] \) A. Add \( 3.66 \mathrm{~g} \mathrm{NaCl} \) to \( 250 \mathrm{~cm}^{3} \) of distilled water B. Weigh \( 3.66 \mathrm{~g} \mathrm{NaCl} \) into \( 250 \mathrm{ml} \) flask and add distilled water up to the mark C. Add \( 14.60 \mathrm{~g} \mathrm{NaCl} \) to \( 250 \mathrm{~cm} 3 \) of distilled water D. Weigh \( 14.60 \mathrm{~g} \mathrm{NaCl} \) into \( 250 \mathrm{ml} \) flask and add distilled water up to the mark 5. What is the shape of \( \mathrm{PCl}_{3} \) ? A. Trigonal planar B. Trigonal pyramidal C. Tetrahedral D. V-shaped (bent)

          1. A normal body temperature is \( 37^{\circ} \mathrm{C}, \mathrm{K}_{\mathrm{w}}=2.4 \times 10^{-14} \). Calculate \( \left[\mathrm{H}_{3} \mathrm{O}^{+}\right] \)and \( \left[\mathrm{OH}^{-}\right] \)for the body fluid at this temperature.
A. \( \left[\mathrm{H}_{3} \mathrm{O}^{+}\right]=\left[\mathrm{OH}^{-}\right]=2.5 \times 10^{-7} \)
B. \( \left[\mathrm{H}_{3} \mathrm{O}^{+}\right]=\left[\mathrm{OH}^{-}\right]=1.5 \times 10^{-8} \)
C. \( \quad\left[\mathrm{H}_{3} \mathrm{O}^{+}\right]=\left[\mathrm{OH}^{-}\right]=1.5 \times 10^{-6} \)
D. \( \quad\left[\mathrm{H}_{3} \mathrm{O}^{+}\right]=\left[\mathrm{OH}^{-}\right]=1.5 \times 10^{-7} \)
2. Atoms of elements in a group on the Periodic Table have similar chemical properties. This similarity is most closely related to the atoms'.
A. number of principal energy levels
B. number of valence electrons
C. atomic numbers
D. atomic masses
3. How many atoms of \( \mathrm{Cu} \) are present in \( 35.4 \mathrm{~g} \) of \( \mathrm{Cu} ?\left[\mathrm{Cu}=63.5 \mathrm{gmol}^{-1}\right] \)
A. \( 1.08 \times 10^{24} \) atoms of \( \mathrm{Cu} \)
B. \( 3.27 \times 10^{23} \) atoms of \( \mathrm{Cu} \)
C. \( 6.02 \times 10^{23} \) atoms of \( \mathrm{Cu} \)
D. \( 1.20 \times 10^{22} \) atoms of \( \mathrm{Cu} \)
4. How would you prepare \( 250 \mathrm{~cm}^{3} \) of \( 0.25 \mathrm{M} \) aqueous solution of \( \mathrm{NaCl} \) ?
\( \left[\mathrm{Na}=23 \mathrm{~g} \mathrm{~mol}^{-1} ; \mathrm{Cl}=35.5 \mathrm{~g} \mathrm{~mol}^{-1}\right] \)
A. Add \( 3.66 \mathrm{~g} \mathrm{NaCl} \) to \( 250 \mathrm{~cm}^{3} \) of distilled water
B. Weigh \( 3.66 \mathrm{~g} \mathrm{NaCl} \) into \( 250 \mathrm{ml} \) flask and add distilled water up to the mark
C. Add \( 14.60 \mathrm{~g} \mathrm{NaCl} \) to \( 250 \mathrm{~cm} 3 \) of distilled water
D. Weigh \( 14.60 \mathrm{~g} \mathrm{NaCl} \) into \( 250 \mathrm{ml} \) flask and add distilled water up to the mark
5. What is the shape of \( \mathrm{PCl}_{3} \) ?
A. Trigonal planar
B. Trigonal pyramidal
C. Tetrahedral
D. V-shaped (bent)

1. A normal body temperature is 37^∘C, Kw=2.4 × 10^-14. Calculate [H3O^+]and [OH^-]for the body fluid at this temperature.
A. [H3O^+]=[OH^-]=2.5 × 10^-7
B. [H3O^+]=[OH^-]=1.5 × 10^-8
C. [H3O^+]=[OH^-]=1.5 × 10^-6
D. [H3O^+]=[OH^-]=1.5 × 10^-7
2. Atoms of elements in a group on the Periodic Table have similar chemical properties. This similarity is most closely related to the atoms'.
A. number of principal energy levels
B. number of valence electrons
C. atomic numbers
D. atomic masses
3. How many atoms of Cu are present in 35.4 g of Cu ?[Cu=63.5 gmol^-1]
A. 1.08 × 10^24 atoms of Cu
B. 3.27 × 10^23 atoms of Cu
C. 6.02 × 10^23 atoms of Cu
D. 1.20 × 10^22 atoms of Cu
4. How would you prepare 250 cm^3 of 0.25 M aqueous solution of NaCl ?
[Na=23 g mol^-1 ; Cl=35.5 g mol^-1]
A. Add 3.66 gNaCl to 250 cm^3 of distilled water
B. Weigh 3.66 gNaCl into 250 ml flask and add distilled water up to the mark
C. Add 14.60 gNaCl to 250 cm 3 of distilled water
D. Weigh 14.60 gNaCl into 250 ml flask and add distilled water up to the mark
5. What is the shape of PCl3 ?
A. Trigonal planar
B. Trigonal pyramidal
C. Tetrahedral
D. V-shaped (bent)

Added by Jorge K.

Question

Please give Ace some feedback