What do you know about chemical reactions? A chemical reaction is a route that leads to the transformation of one group of chemical substances to another. Chemical reactions exemplify changes that only involve electrons'...
Questions: 12 | Attempts: 10460 | Last updated: Apr 6, 2021
Which one of the following represents a physical change?
Questions: 17 | Attempts: 5481 | Last updated: Sep 11, 2020
Pb(NO3)2+ 2 KI ---> PbI2+ 2 KNO3
What constitutes this reaction?
Endothermic and Exothermic are chemical reactions that absorb and release heat. An example of an endothermic reaction is photosynthesis. An exemplar of an exothermic reaction is combustion. Specifically, exothermic reactions...
Questions: 10 | Attempts: 3622 | Last updated: May 26, 2021
C6H12O6 + 6O2 à 6CO2 + 6H2O ∆H = -2803 kJ