What is the oxidation number of
1. Se in CaSeO4
2.Se in H2Se
3.br in BrO3(-1)
4.P in NaH2PO4
5.cu in Cu(NO3) 2
6.S in SO4(-2)
7.S in K2S2O3
8. AL(+3)
9.N in NH3
10. zn in ZnCl2
11.O in H3O(+1)

Covalent network solids typically have melting points and boiling points. the chemical formula of a network solid indicates in the molecule.

The table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 9 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of tthe table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 9 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

When the chemicals iron sulfide (fes) and hydrochloric acid (hcl) are combined, bubbles appear from the mixture. 1. does the appearance of bubbles indicate a physical or chemical change? 2. why do the bubbles indicate this change? 3. what property is this?