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English 14 Public

Types of compounds and their chemical formulae

Study Slideshow

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

H+

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

(OH)+

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

Divalent (2 )

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

number of atoms.

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

noble gases

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

HBr

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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

a) a negative nonmetal ion with a positive atomic group

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

phosphate.

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

c) a salt

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

NaOH

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

sliver chloride

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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

NaX3

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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

Ferrous

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

Mgcl2

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