Unformatted text preview: ight during the exams. 1. A solid yellow substance, A, is heated to a high temperature in the absence of air. It
decomposes to form two new substances, B (a white solid) and C (a gas). The gas has the
same properties as the gas formed when carbon is burned in an excess of air. Which one
of the following statements about substances A, B and C is correct? (Choose the best
B. Substance A is a compound, and B and C may be elements or compounds. C. All substances must be elements. D.
2. Substance A has to be a mixture and B and C elements. Substance A must be a compound, and B and C must both be elements. Which of the following describes a physical property? A.
B. 3. Energy is released when
oxygen reacts with hydrogen.
Plant growth occurs in...
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