chemical compounds

all of these substances turn litmus paper into red except….. a)HCl     b)HNO3       c)NaOH

1) when an base dissolves in water, it produces …....… ions. a)(OH)+ b)H- c)H+

Ammonium chloride salt is formed on the combination of ….. a)a negative nonmetal ion with a positive atomic group.     b)a negative nonmetal ion with a negative nonmetal ion.      c)a positive metal ion with a negative atomic group

on the combination of (Mg)+2 ion with (CO3)-2 group……..is formed.                                           a)an acid         b)a base     c) a salt

all of these substances turn litmus paper into blue except….. ...a)NaOH         b)KOH       c)HBr

11. A nonmetal, X, has 5 electrons in the outer shell. What is the chemical formula of the ionic compound formed when X reacts with sodium? (Na11) a)NaX3 b)Na3X c) Na2X

14. What is the chemical formula of the ionic compound magnesium chloride?         a)MgCl2          b) Mg2Cl      c)MgCl

all of these salts dissolve in water except …..                   a)sliver chloride.               b)sodium chloride.            c)sodium sulphate.

13. Atoms of iron can have a valency of either 2 or 3.        What is the name given to compounds formed from iron atoms with a valency of 2?                  a) Ferry       b)Ferric     c) Ferrous

…….. are the most stable elements. a)metals b)nonmetals c)noble gases

all of the following are monovalent atomic groups except …….. group           a)nitrate.          b)hydroxide.                     c)phosphate.

6) Nitrate and nitrite groups are different in the …. .....a)types of atoms.      b)number of atoms.        c)valency.

2) when a nonmetal gains or shares two electrons, it’s valency will be ….. a)monovalent        b)divalent c)trivalent

1) when an acid dissolves in water, it produces …… ions.      a)(OH)+      b)H-        c)H+