Petroleum and coal tar Minerals and plants Mordent and azoic Create your account to access this entire worksheet A Premium account gives you access to all lesson, practice exams, quizzes & worksheets Access to all video lessons Quizzes, practice exams & worksheets ...
of oxygen to liberate heat or light. Sometimes, light is given during combustion, either in the form of a flame or glow. A material that undergoes combustion is referred to as an explosive substance. Natural gas, petroleum and coal are some examples of naturally occurring combustible materials....
5. When coal is burnt, ___ energy is converted into light and heat.• Electric • Atomic • Chemical Answer: 6. What is the name given to the green pigment in plants ?• Stomata • Chlorophyll• Tendrils • Starch Answer: 7. From the bark of which tree is quinine obtain...