Study Notes Chemical Reactions and Equations | Science | 10th Grade | 2025/26

NOTES
CHAPTER 1.
CHEMICAL REACTIONS AND EQUATIONS.

ACTIVITY 1.1

● THINGS FOR ACTIVITY:
▪︎A BURNER
▪︎A PAIR OF TONGS
▪︎MAGNESIUM RIBBON
▪︎A WATCH GLASS
▪︎SANDPAPER
● RUB MAGNESIUM RIBBON WITH SANDPAPER TO
REMOVE A LAYER CALLED "MAGNESIUM OXIDE", WHICH
IS FORMED BY SLOW REACTION OF OXYGEN (PRESENT IN
AIR) WITH MAGNESIUM RIBBON.
● NOW HOLD THE RIBBON WITH THE HELP OF PAIR OF
TONGS AND BURN IT FROM THE BURNER.
● DURING BURNING , MAGNESIUM RIBBON BURNS WITH
A "DAZZLING WHITE FLAME".
● NOW COLLECT THE ASH SO FORMED IN A WATCH
GLASS.
● THE ASH IS A "WHITE POWDER" WHICH IS KNOWN
AS "MAGNESIUM OXIDE".



ACTIVITY 1.2

● THINGS FOR ACTIVITY:
▪︎2 TEST TUBE
▪︎IN TEST TUBE 1 TAKE THE SOLUTION OF LEAD NITRATE
▪︎ IN TEST TUBE 2 TAKE ANOTHER SOLUTION OF
POTASSIUM IODIDE
● NOW IN TEST TUBE 1 ADD THE SOLUTION OF TEST
TUBE 2 I.E ADD THE SOLUTION OF "POTASSIUM IODIDE"
IN THE SOLUTION OF "LEAD NITRATE".
●
CHANGES THAT TAKE PLACE ARE:
▪︎
CHANGE IN COLOR: YELLOW ( LEAD IODIDE)
▪︎
FORMATION OF PRECIPITATE ( LEAD NITRATE)
FORMULA:
PB(NO3)2 (AQ) + 2KI ---- PBI2 (S) + 2KNO3 (AQ)