Use app×
Join Bloom Tuition
One on One Online Tuition
JEE MAIN 2025 Foundation Course
NEET 2025 Foundation Course
CLASS 12 FOUNDATION COURSE
CLASS 10 FOUNDATION COURSE
CLASS 9 FOUNDATION COURSE
CLASS 8 FOUNDATION COURSE
+1 vote
14.1k views
in Chemistry by (51.5k points)
closed by

With the help of an activity; demonstrate how do we know that a chemical reaction has taken place?

1 Answer

+2 votes
by (56.2k points)
selected by
 
Best answer

For a chemical reaction to take place some chemical change must occur. So, here is the activity to demonstrate a chemical reaction: 

Step-1: Take a magnesium ribbon around 2cm long by rubbing it with sand paper. 

Step-2: Hold it with tongs. 

Step-3: Burn the ribbon and collect the ash in a watch glass which is white in pair. 

Precaution must be taken while performing the experiment to keep the burning ribbon far away from eye. The experiment should be under some expert supervision. 

In the activity we observed that magnesium ribbon burns with a white flames and changes into white powder. This powder is magnesium oxide. 

There was a change in state, change in colour, change in temperature all of these are chemical changes and this proves that chemical reaction takes places here in which magnesium was converted into magnesium dioxide.

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

Categories

...