Directions: In the following question, a number sequence is given with one term missing. Choose the correct term that will continue the same pattern and replace the question mark in the given sequence.2,-1,2,-1,2,?
Correct answer: B. -1
- A. 2
- B. -1
- C. 5
- D. 4
Explanation
The given sequence is: 2, -1, 2, -1, 2, ?. The pattern here is an alternating one: every second term is the same. Starting from the first term, we have 2, then -1, then again 2, followed by -1, and again 2. Therefore, following this alternating pattern, the term that follows 2 should be -1.Option B (-1) is correct as it maintains the established pattern of alternating between 2 and -1.Options A, C, and D (2, 5, and 4) are incorrect as they do not follow the pattern established by the sequence.
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About Thermochemistry and Energetics of Chemical Reactions
Thermochemistry measures energy changes in chemical reactions and distinguishes exothermic from endothermic processes. Work covers systems, surroundings and state functions, internal energy, the first law of thermodynamics, enthalpy and Hess's law, including the sign conventions used when heat enters or leaves a system.
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