Why new substances are formed during chemical change?

Is red algae helpful or harmful to humans? Can a lightning bolt power a whole city? What are the different types of errors in Microsoft Excel and their causes? What is the class of intrusion in peace of others life? What kind of model would be used to predict earthquakes? How do you determine if a 100 amp service will accommodate the addition of an electric tankless water heater that requires a 60 amp breaker? How many cups in a pint and half? If the pool measures 6m by 5m by 3m Then what volume of water must you purchase to refill the pool? What are the after effects of having an angioplasty? Why put solar farms next to residential areas? Where did Michael faraaday go to college? What does an enzymes need to bind to in order to be able to catalyze a specific reaction? How many electron does phosphorus gain or lose when forming ion? Do physical features make the most logical and long lasting type of political boundary? How can the process of melting plastic bottles into bricks be effectively utilized for sustainable construction practices? What is a pyrimidine not found in DNA? How do blizzards affect the economy? Do Catalyst speed chemical reactions but are not changed by them? Hello I'm aarti gole my problem is that last 4 years ago my endouscopy operation not successful. pelase give me answer? When does the cursor change shape?