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Chemistry

2 answers:

timama [110]3 years ago

4 0

The first one is true.

The second one is false.

Crazy boy [7]3 years ago

4 0

5. true (Energy cannot be created nor destroyed)
6. false (Potential energy does NOT increase over time)

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Which substance is an electrolyte? <br> a.ch3oh <br> b.c6h12o6 <br> c.h2o <br> d.koh?

Travka [436]

The answer is D. KOH (potassium hydroxide)

5 0

3 years ago

draw the lewis structure for CO2, H2CO3, HCO3-, and CO3 2-.Rank these in order of increasing attraction to water molecules. Expl

gavmur [86]

Answer:

The structures are attached in file.

Hydrogen bonding and intermolecular forces is the reason for ranks allotted.

Explanation:

In determining Lewis structure, we calculate the overall number of valence electrons available for bonding. Making carbon (the least electronegative atom) the central atom in the structure, we allocate valence electrons until each atom has achieved stability.

In order of decreasing affinity to water molecules:

$CO_{3}^{2-} > HCO_{3} ^{2-} > H_{2} CO_{3}$

This is due to the fact that the $CO_{3}^{2-}$ will accept protons more readily than the bicarbonate ion, $HCO_{3} ^{2-}$ . Carbonic acid, $H_{2} CO_{3}$ will not accept any more protons, hence it is the least attractive to water molecule, even though soluble.