Chem

Question 1

product of metal carbonate

Answer 1

metal oxide + carbon dioxide

Question 2

product of metal hydrogen carbonate

Answer 2

metal carbonate + carbon dioxide + water

Question 3

product of metal hydroxide

Answer 3

metal oxide + water

Question 4

Decomp

Answer 4

heat reactant in boiling tube with bung, tube goes into test tube of limewater

Question 5

Catalytic decomp

Answer 5

water forms with oxygen bubbles, warm, to test for oxygen, do glowing splint test. catalyst present, no heat needed

Question 6

Iron + sulfur —> iron sulfide

Answer 6

grey/black + yellow gas –> black/grey iron sulfide,

magnetic to non-magnetic, thru bright glow

Question 7

colour of copper oxide

Answer 7

black

Question 8

colour of sodium + chlorine gas –> sodium chloride

Answer 8

shiny grey + yellow/green –> white crystals

Question 9

hydrogen + oxygen –> water

Answer 9

explode w/ small flame, loudy squeaky pop. Condensation of colourless liquid form on tube

Question 10

sulfur + oxygen –> sulfur dioxide

Answer 10

yellow solid, burns with blue flame forming colourless gas

Question 11

Testing for different ions in one solution

Answer 11

To test for presence of A and B ions, find out what other ions go with A and B to form a ppt. Add the new ions to both A and B, it’ll form 1 ppt, 1 solution, the ppt will be incl either A or B depending on if they form ppt or not, then try with new (2) to confirm other unknown ion.

Question 12

Testing for different ions in unknown solutions using other given solutions

Answer 12

Add solution A to all unknowns and find out which form ppt and which don’t, then you know which ion it contains out of the unknown. Add solution B to the remaining unknowns to see what forms ppt which you can identify the ions in which solution.

Question 13

Testing for different ions in one solution using given solution and a metal

Answer 13

Add metal to unknown, if metal is more reactive than unknown ion, reaction occurs, so we know the unknown ion is A. When do it again, if less reactive, no reaction so we know what the other unknown ion is present. To confirm, add given solution to unknown and depending on colour of ppt or if it even forms one, we know the ion present.

Question 14

colour of copper carbonate/copper chloride

Answer 14

CuCO3 green decomp, blue green solid/solution, the CC’s are multi coloured

Question 15

colour of lead oxide

Answer 15

yellow

Question 16

colour of zinc oxide

Answer 16

yellowy green when hot, cools to white

Question 17

colour of copper in displacement

Answer 17

reddy brown

Question 18

iron + oxygen gas –> iron oxide

Answer 18

iron glows red hot from heating and sparks in flame, black solid forms

Question 19

carbon + oxygen –> carbon dioxide

Answer 19

black non-metal solid burns w/ yellow flame to make CO2

Question 20

magnesium + oxygen –> magnesium oxide

Answer 20

shiny grey metal burns w/ bright white light making grey white ash

Question 21

copper hydroxide

Answer 21

green to black in thermal decomp

Question 22

iron + chlorine –> iron chloride

Answer 22

green yellow gas with grey iron glows bright orange form brown solid