P

Question 1

chlorine and water

Answer 1

cl2(aq)+H2O(l)–>HClO(aq) +HCl(aq)

Question 2

chlorine and diluted sodium hydroxide

Answer 2

Cl2(aq) +2NaOH(aq)–>NaClO(aq)+NaCl(aq)+H2O(l)

Question 3

group 2 + oxygen

Answer 3

2Mg(s)+O2–>2MgO(s)

Question 4

group 2 + water

Answer 4

Mg +2H2O –>Mg(OH)2 +H2

Question 5

group2 +acid

Answer 5

Mg+2HCl–>MgCl2 +H2

Question 6

Group 2 oxide and water

Answer 6

CaO +H2O–>Ca2+ +2OH-
only slightly soluble so when too saturated
Ca2+ +2OH- –>Ca(OH)2(s)

Question 7

use of group 2 compounds as bases (agriculture)

Answer 7

Ca(OH)2(s) +2H+(aq) —>Ca2+(aq) +H2O(l)

Question 8

Use of group 2 compounds as bases (medicine)

Answer 8

Mg(OH)2(s) +2HCl –>MgCl2(aq) +H2O(l)
CaCO3 (s) +2HCl(aq) —>CaCl2(aq) +H2O(l) +CO2(g)

Question 9

test for carbonate

Answer 9

XCO3^2- +2HNO3(aq)–>2XNO3(aq)+CO2 +H2O

CO2 + Ca(OH)2 –>CaCO3 +H2O

Question 10

test for sulfates

Answer 10

Ba2+(aq) +SO4^2- (aq)—>BaSO4(s)

Question 11

test for halides

Answer 11

Ag+(aq) + X- (aq) –>AgX(s)