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5.2.2 Group 1 metals are very reactive when placed in water. Write out the balanced chemical equation of the reaction between sodium and water. (4)

9.4 Explain what the arrows in a food chain or food web represent. (2)

Identify the function’s local and absolute extreme values, if any, saying where they occur.f(x) =

7.5 Right-click on the blue button below and open the circuit in a new tab. Study the circuit and answer the question that follows.   What is the reading on the voltmeter? (1)       A) 3V   B) 2V   C) 6V   D) 1V  

What cranial nerve stimulates secretomotor function in structure labeled “A” in the figure below?

7.2 State the atomic number of the element Neon. (1)

What bone of the skull is labeled “A” in the figure below.

  QUESTION 8   Read the extract below, carefully, and answer the questions that follow.   “The word Piezoelectric refers to a material that produces an electric charge when it’s bent or squeezed. The electricity results from pressure and heat building up in the material. Many materials can produce piezoelectricity. Crystals and ceramics both can. Bones and even some protein molecules can be piezoelectric as well. Scientists are looking for ways to use piezoelectricity to do work for us. Piezoelectric materials in clothing could charge our cell phones while they sit in our pockets. Keyboards with piezoelectric keys could harvest electricity as we type. Piezoelectric devices could even use our movements to power themselves as they keep track of our health.” (source: Brookshire, B. 2021. Scientists Say: Piezoelectric. ScienceNewsforStudents.  https://www.sciencenewsforstudents.org/article/scientists-say-piezoelectric . [Accessed 7 June 2021])

  TOTAL QUESTION 7: [5]

8.4 Explain the purpose of the air bubble. (1)