Why might sodium carbonate (washing soda, Na2CO3 ) be added to hard water to aid in cleaning?
A) The hard ions in the water are more attracted to the carbonate ions -2 charge.
B) The hard ions are dissolved by the added sodium ions.
C) The soap gets softer due to the added ions.
D) The ions solubilize the soap due to ion-ion intermolecular attraction, which improves the cleaning ability.
E) none of the above
Question 2
What is the main function of the structural difference of the sugar that makes up RNA?
A) It keeps the RNA from binding tightly to DNA.
B) It allows the RNA to be easily digested by enzymes.
C) It keeps the RNA stable while it is outside the nucleus.
D) It acts as an energy source for the production of proteins.
E) all of the above
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