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.

assuming that your periodic table has eighteen columns, you should highlight   the four elements in the third column from the left of the table.

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the have energy higher than those in the orbital while lower than those of the orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the orbital is therefore filled right after orbitals and before orbitals.  

potassium has electron configuration and calcium . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the and should be highlighted as well.

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.