7TH STANDARD SCIENCE CHAPTER 2 ACIDS AND BASES. OXIDES AND CHEMICAL INDICATORS. LECTURE 8

7TH STANDARD SCIENCE 

CHAPTER 2 ACIDS AND BASES. 

OXIDES AND CHEMICAL INDICATORS. LECTURE 8

HI STUDENTS .....

HERE YOU WILL LEARN ABOUT THE FOLLOWING.

1 WHAT ARE OXIDES 

2 WHAT ARE CHEMICAL INDICATORS.

1 WHAT ARE OXIDES:

 THE WORD OXIDES MAKES US TO UNDERSTAND THE MATERIALS IS A PRODUCT PRODUCED AFTER THAT IS BURNT IN OXYGEN.

EXAMPLE :

MAGNESIUM HYDROXIDE,

POTASSIUM HYDROXIDE

CALCIUM HYDROXIDE

AMMONIUM HYDROXIDE

2. CHEMICAL INDICATORS:

CHEMICAL INDICATORS ARE ARTIFICIAL INDICATORS WHICH MADE UP OF CHEMICALS SUBSTANCES.

EXAMPLE:

METHYLE ORANGE (LOOKS IN ORANGE COLOR)

PHENOLPHTHOLEIN (LOOKS COLORLESS)

USING CHEMICAL INDICATORS YOU CAN DO SOME MAGICS AS FOLLOWS...

DO YOU BELIEVE THAT BLOOD COMES OUT OF A LEMON? HOW IS IT POSSIBLE?

 WHEN A MAGICIAN OR A JUGGLER CUTS A LEMON, BLOOD FLOWS OUT OF IT! ACTUALLY, HE USES A KNIFE DIPPED IN METHYL ORANGE OR HIBISCUS SOLUTION TO CUT THE LEMON. WHEN METHYL ORANGE IS MIXED WITH CITRIC ACID (LEMON JUICE) IT TURNS RED. BUT IT IS NOT BLOOD. IN MANY OF OUR PLACES WE FIND PEOPLE DOING THIS AND PRESENTING IT AS MAGIC. IN OUR STATE SOME ARE PERFORMING ABOVE SCIENCE TIPS AS BLACK MAGIC (MANTRALU, CHETABADI AND BANAMATHI) AND DECIEVE THE PEOPLE. NOW YOU CAN ALSO DO THIS!

FOR MORE INFORMATION YOU CAN WATCH THE FOLLOWING VIDEO.