Which of the following bonds is definitely bonic? Which of these statements abou

Question

Which of the following bonds is definitely bonic? Which of these statements about greenhouse gases and the greehouse effect is not correct? Greenhouse gases prevent infrared radiation from escaping through the atmosphere. To absorb infared radiation, a molecule must have a vibration that produces a change in the dipole moment of the molecule. Argon is the third most abundant species in the atmosphere (after nitrogen and oxygen), and therfor a significant greehouse gas. The average amount of carbon dioxide in the atmosphere increases when fossil fucts are bumed, but when ethanol (CH_2CH_2OH) produced from plants is burned. I only II only IIIonly IV only III and IV only

Explanation / Answer

19)

The lewis structure:

is a, since b is not even a carboxilic acid, c lacks of lone pairs in th eOH oxygen, d has plnety of lone pairs nonexists

20)

polar covalent bonds = medium difference in electronegativities (usually between nonmetal - nonmetal)

O2 - nonpolar

N" - nonpolar

CN- : polar (electron makes it dipole)

H2: nonpolar

I2: nonpolar

21)

element with larges electronegativity (trend goes from left to right, from bottom to top of th epriodic table)

K, Li Cs (alkaline metals) --> little electronegativity

MG --> medium low electrongetaiviyt (earth alkalki)

B ---> medium high electronegativity... therefore choose Boron

22) which are ionic

ionic bonding = metal + nonmetal

If difference > 1.6, then ionic

IF difference < 1.6, then coivalent

Li-C = 1-2.5 = 1.5 this is covalent

LI-H = 2.1-1 = 1.1 non covalent

Li-O = 3.5-1 = 2.5, ionic

Li-Li = 0 non ionic

C-O = 3.5-2.5 = 1, non ionic

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