Since the another picture cannot post up ,so i just type in the last point for this question (d)Experiment5
A little of the solution from Experiment2 was poured into a test-tube. The solution from Experiment4 was added to the test-tube. Observations were noted.
Observation-rapid effervescence-

Question. suggest an explanation for the observations in experiment5.

the ans is -carbonate
-carbon dixide
-acid

why the ans is these?

girl imma just put my comment here because i need a couple point okurrttt

(b) which contains higher levels of vitamin b, oranges or spinach?

explanation:

you can eliminate a, c, and d because they are questions based on opinions.

the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.