Question

A teen is making iced coffee and would like it sweeter but is unable to get the sugar to dissolve.

What method could dissolve more sugar in the iced coffee?

A.
Add the sugar right after the coffee has brewed, while it is still hot.

B.
Keep adding sugar at longer time intervals.

C.
Wait for the ice to dissolve to then add sugar.

D.
Measure the amount of sugar more accurately.

Answer 1

please help

Answer 2

The ability of a substance to dissolve is temperature-depend. For many substances, the higher the temperature, the more soluble it becomes.

A. Adding sugar to the hot coffee would dissolve it, however, on addition of ice, temperature will drop, so some of the sugar will recrystallize as its solubility is lower

B. Solubility is what's limiting the concentration of dissolved sugar. Waiting wouldn't make it more soluble. It can only increase the speed necessary to dissolve the given amount of sugar.

C. This is the correct answer. If you wait for the ice to melt, the temperature will rise and so will solubility of sugar.

D. By calculating he might know the exact amount of sugar that could be dissolved at the given temperature but it's not possible to increase the solubility in any way.

Answer 3

A

Answer 4

Which mixture can be separated using filtration?

Choose all answers that are correct.

A.
different colored liquids

B.
soluble solids in water

C.
solids of different sizes

D.
insoluble solids in water

Answer 5

A and C

Answer 6

@milbes919180 Why do you suggest answer A on the question about coffee? Is it kinetics of dissolution that you're taking into account?

Answer 7

Filtration removes solids from a liquid. Rules out A and B.