a)too little percolation means the soils become waterlogged
b)too much percolation means the water leeches away nutrients
c)alkaline percolation corrodes the plant roots
d)acidic percolation corrodes the plant roots
2)Soil with a pH between 4 & 7
a)corrodes roots, destroying most plants
b)kills disease-causing bacteria, benefiting most plants
c)is rich in hydroxide ions, which trap nitrogen molecules, making fixation impossible for most plants
d)is rich in hydronium ions, which dislodge nutrients held by minerals and humus,making them available for plants
3)Neutral solutions
a)contain equal concentrations of hydronium & hydroxide ions
b)contain neither hydromonium no hydroxide ions
c)have a pH of 0
d)are obtained when an acid is combined with water
4)You have a glass of pure water.Are chemical reactions occuring in the water?If so what are they,if not explain why.
Answers:
1 - b
2 - not sure, but definitely not b
3 - a
4 - Yes, there are. There is a constant flux of protons (hydrogen ions) between water molecules, creating and then neutralising H30+ and OH- ions. Also (though not technically a chemical reaction) there is the hydrogen bonding between water molecules forming and breaking up the ice-like regions within the water.
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