Spring 2018 PARTI Multiple Choice (2 points each) Please DO NOT write or mark on

Question

Spring 2018 PARTI Multiple Choice (2 points each) Please DO NOT write or mark on this paper. Mark your answer on your What is the best answer to the following expression? (12.125+ 0.530+71.0) ) 84.055 B) 84.06 C 84.1 D) 84.0 E) 84 Which of the following is equal to 0.01 cm? A) 0.01 m B) 0.1 mm C) D) E) 1 mm 100 mm 10 mm The strongest intermolecular interactions between water molecules (H,O) mole A) Dipole-dipole forces B) C) Hydrogen bonding D) Covalent bonding E) Ion-dipole forces London dispersion forces Which of the following is an example of a chemical change? A) water boiling B) ice melting C) D) rusting of a nail alcohol evaporating E) iodine vaporizing The formulas of the hydroxide ion, the nitrate ion, and the nitrite ion are re A) OH, NO3, POs3 B) H, NO2, P3- C) H, NO3 , NO2 D) OH, NO, NO2- E) OH, NO2, PO3

Explanation / Answer

Ans. #1. 12.125 + 0.530 + 71.0 = 83.655 = 84.0

While rounding off, the final value must have the least number of decimal places as in any of the values used in calculation. In this case, the value “71.0” has one decimal place, so the final value “83.655” must also be rounder off to one decimal place.

So, correct option is- D. 84.0

#2. Correct option- B. 0.1 mm

1 cm = 10 mm

So, 0.01 cm = 0.01 x (10 mm) = 0.1 mm

#3. Correct option- C. Hydrogen bonding.

# Hydrogen bonding is the strongest intermolecular (between two molecules, non-covalent) interactions between water molecules.

# Covalent bonds, though the strongest, does not form between two water molecules.

# Rest other forces are weaker than H-bonding.

#4. Correct option- C. rusting of iron. Rusting of iron is a chemical process in which iron is oxidized into hydrated ferric oxides. The chemical properties of iron and resultant iron oxides are quite different from each other.

# Boiling of water and melting of ice are physical processes because the chemical property of water is retained during the process.

# Similarly, evaporation and vaporizing are also physical processes.

#5. Correct option- D.       OH-, NO3-, NO2-

# H+ is proton or hydrogen ion.

# PO43- is phosphate ion

# P3- is phosphide ion

Related Questions

Navigate

• Browse (All)
• Browse S
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.