Last question based on my previous question Experimental : To determine the concentration of potassium hydroxide solution, by acid titration

Explanation:

1)  White tile can be placed underneath the conical flask to make easier  spotting the end point  of color change.

2) Because it will affect the number of molecules of reactant in the flask.

3)

Acid is added slowly into alkali solution mixed with indicator

The color of indicator changed. So, the mixture has neutralised.

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

if you need further assistance, let me know: )

~ trueboss72

they all get energy from eating other animals, dead animals to be more precise.

hienas tends to steal pray from other animals. crows and vultures tend to eat dead animals and leftovers.

hope it ,

bioteacher101