Which substances are acids? Check all that apply. AgOH
HF
NiOOH
NH4OH
HMnO4
Zn(OH)2

HF

HMnO4

Explanation:

bc i know everything

Explanation:

Hope this helps:

AgOH is silver hydroxide

HF is hydrofluoric acid

NiOOH is nickel oxide hydroxide

NH4OH is ammonium hydroxide

HMnO4 is Permanganic acid

Zn(OH)2 is zinc hydroxide

nacl is added to the aqueous of what? ? in order to get a proper answer you have to specify the exact composition of the aqueous solution.

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms