Answer:
Explanation:
S is in 3d period, so it has 3 levels
1 level has 2 electrons, 2d level 8 electrons, 3d level 6 electrons
Allergies arise when a foreign material such as pollen, bee venom or pet dander responds to your immune system or a food that in most people does not cause a reaction. Substances known as antibodies are formed by your immune system.
Answer:
The correct answer is b polar covalent
Explanation:
When two atoms joined by covalent bond has difference in their electronegativities at that time polarity arise.
When the electronegativity difference is low such as 1.3 then the polar bond formed by the two atoms are called polar covalent bond.For example H2O
on the other hand polar bond formed by two atoms having high difference in their electronegativities is called ionic bond.For example NaCl.
Formula for pH is pH = -log [H+]
you use 4.0x10^-9 and substitute in for [H+]
Fromula looks like this:
pH = -log (4.0x10^-9) - from here different calculators will require different buttons to push to get the answer
Solved out:
pH = -log (4.0x10^-9)
pH = -(-8.398) = 8.398 is the pH
