Need help with chemistry PLEASE!!!!?

Question

I don't get these questions. Can u help me please?

1.) Sucrose, or table sugar, can react with water to form two other compounds, glucose and fructose. However, when you add sugar to a glass of water, this reaction proceeds extremely slowly. Why does it proceed slowly, and what else is needed to speed up the reaction?

2.) How much sugar is there in 100 mL of a 10 percent aqueous sugar solution? And what is the solvent in this solution?

3.) How many times more hydroxide ions are there in a solution with a pH of 9 than in a solution with a pH of 3?

4.) WHat are the relative numbers of H3O+ and OH- ions in an acidic, an alkaline, and a neutral solution?

5.) Every chemical reaction involves a...
a. change in the state of the matter in the reactants
b. net release of energy
c. transfer of energy
d. transfer of electrons between atoms

Answer 1

1) The recaction proceeds slowly because the chemical bonds in sucrose are covalent (shared electrons) not ionic. You can increase the reaction rate by adding a catalst or enzyme, or by increasing the energy in the system (up the temperature).

2) A 10% aqueous solution of sugar is .1 molar. Multiply the mole weight of sugar (342g) by .1 (the solution concentration) and divide by 10 (because you have 1/10 of a liter). The answer is 3.42 grams.

3) 10 to the 6th power, = 1,000,000.

4) In an acidic solution, there are more H30+ ions, in alkaline, more OH- ions, in a neutral solution, they are approximately equal.

5) c., a transfer of energy. If a reactions takes place, some energy is either released or absorbed. The state may not change (2 liquids reacting), so a is wrong. Some reactions do not release energy (many require an addition of energy, think of plants producing sugar from CO2 and oxygen...they're actually storing energy), so b is wrong. D is wrong because some reactions (like going from water to ice) don't transfer any electrons.

Answer 2

ok...i only know one...

#1. when particles move from high concentration to low concentration, this is called osmosis, so energy is required

Answer 3

Very interesting.