The recommended calcium intake for teenagers is 1,300 mg per day. A glass of milk contains 305 mg Ca. One glass contains a volume of eight fluid ounces. How many liters of milk should a teenager drink per day to get the recommended amount of Ca? One fluid ounce equals 29.6 mL.

Therefore a teenager should drink 1.0093 L per day.

Explanation:

Given that,

The recommended calcium intake for teenagers is 1,300 mg per day.

A glass of milk contains 305 mg Ca.

So, 305 mg Ca is contained by 1 glass of milk.

        1   mg Ca is contained by  1/305 glass of milk.

    1300 mg Ca is contained by 1300/305 glass of milk.

                                                   =260/61 glass of milk.

One glass milk contains a volume of eight fluid ounce = (8×29.6) mL =236.8 mL.[∵1 fluid ounce = 29.6 m L]

∴260/61 glass of milk = (260/61)×236.8 mL.

                               ≈1009.3 mL

                               =(1009.3÷1000) L   [∵ 1000 mL= 1L]

                               =1.0093 L

Therefore a teenager should drink 1.0093 L per day.

answer

the ions in solute supperate from eachouthere

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e