You may schedule online tutoring lessons at your personal scheduled times, all with a Money-Back Guarantee. 4) Hydrogen chloride 8) Sulphuric acid. Physical forces alone rarely break down compounds completely. Home | 7th Grade Science Worksheets | Elements and Compounds. Compounds Examples. To keep the future generation safe in such unpredictable... With a larger goal to promote 21st century skills such as critical thinking and problem solving, the Central Board of Secondary Education has shared a Mathematical Literacy: Practice Book for Students. For answers/solutions to any question or to learn concepts, take a FREE Demo Session. 1) Nitric acid 5) Potassium carbonate. An …………… Is a pure substance that cannot be broken down by chemical methods into simpler components. When elements join and become compounds, they lose many of their individual behavior. There are millions of different compounds around us. The study material has been carefully compiled by the best teachers in India. Enter pincode to get tutors in your city. 1) Valency 4) Molecule. ________________, Objects that take up space and have mass._________________. Our mission is to provide high quality online tutoring services, using state of the art Internet technology, to school students worldwide. Answer keys are provided separately. 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Click here to download NCERT Solutions for questions of Class 7 Science NCERT Book.