PLEASE PROVIDE THE (CORRECT) ANSWERS ONLY. EXPLANATIONS ARE NOT NECESSARY. PLEAS

Question

PLEASE PROVIDE THE (CORRECT) ANSWERS ONLY. EXPLANATIONS ARE NOT NECESSARY.

PLEASE DO NOT ANSWER ONLY A FEW, IF YOU ARE ANSWERING THEM, PLEASE ANSWER ALL.

1. Which of the following pure substances may exhibit hydrogen bonding? e) H2NNH2 b) CH30CH3 a) CH3Cl c) H2CO d) N(CH3)3 2. Which of the following would you expect to have the highest boiling point? a) Xe b) CO2 c) NH d) LiCl 3. Which would be the best solvent for CaCO3? c) CH30CH3 a) b) CC d) C6H6 H20 4. Which of the following indicates the presence of weak intermolecular forces in a liquid? a) high heat of vaporization b) low viscosity c) low vapor pressure d) high boiling point 5. As the concentration of a solute in a solution decreases, the freezing point of the solution and the boiling point of the solution a) increases, increases b) increases, decreases c) decreases, increases e) decreases, is unaffected d) decreases, decreases 6. Which of the following crystallizes as a molecular crystal? a) KI b) SiO c) Sn d) H20 e) Al2(SO4) Which of the following phase changes is exothermic? 7. a) Sublimation b) Condensation c) Melting d) Vaporization Use the phase diagram below to answer questions On the phase diagram to the right, which letter corresponds entirely t conditions where the solid and the liquid of the substance are in equilibrium? a) G b) B c) C d) D e) H 9. Based on the phase diagram how will the melting point of the substance change if the pressure is increased? a) It will increase b) it will decrease c) it will remain the same d) it will never melt temperature 10. On the phase diagram, beyond point the vapor cannot be made to liquefy. a) A b) B c) C d) D e) F

Explanation / Answer

Ans 1. e . H2NNH2

This is a molecule of Hydrazine .

when one molecule of hydrazine is present near the other molecule of hydrazine , a temporary covalent bond is formed between the hydrogen of one hydrazine molecule and the Nitrogen of the other hydrazine molecule .

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