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Chapter 4: Q4.2P (page 140)

What two factors cause water to be polar?

Short Answer

Expert verified

The two factors that cause water to be polar are: the bent shape of a water molecule and its polar bonds.

Step by step solution

01

Determine the nature of bonds of the water molecule

In water molecules, the atoms are dissimilar in size and due to the high electronegativity of the oxygen atom, it attracts the electrons towards itself due to which a partial charge is generated on oxygen and hydrogen atoms i.e.,a positive charge on hydrogen and a negative charge on oxygen atomwhich makes a dipole in the water molecule and makes the water molecule polar in nature.

02

Determine the shape of the water molecule 

Due to the presence of two lone pairs on the oxygen atom, the steric hindrance is high between themso, to reduce the steric hindrance between L.P - L.P or L.P - B.P in the water molecule, it becomes bent in shape to form a stable structure.

Hence this makes the water molecule polar in nature.

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Most popular questions from this chapter

Question:How many moles of H+ions are present in the following aqueous solutions?

(a) 1.40 L of 0.25 M perchloric acid

(b) 6.8 mL of 0.92 M nitric acid

(c) 2.6 L of 0.085 M hydrochloric acid

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Must all four hydrogen atoms lie in the same plane? If not, what is the spatial relationship among them? Why?

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(a)4H+(aq)+SO42-(aq)+2NaI(s)鈫�2Na+(aq)+I2(s)+SO2(g)+2H2O(l)(b)BaF2(s)+2H+(aq)+SO42-(aq)鈫�2HF(aq)+BaSO4(s)

Question: Zinc hydroxide is insoluble in water but dissolves when a nitric acid solution is added. Why? Write balanced total ionic and net ionic equations, showing nitric acid as it actually exists in water and the reaction as a proton-transfer process.

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