Staar warm ups 1

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Staar warm ups 1

  1. 1. STAAR Warm-Ups 8th Grade Science FJH
  2. 2. The digestive system performs chemical and physical changes on food ingested. Which of the following is a physical change that occurs during human digestion? • A Amylase in the saliva breaks down starches. • B Cells lining the stomach release pepsin to break down proteins. • C Bile produced in the liver breaks down lipids. • D Molars pulverize food, grinding it into a paste.
  3. 3. In the model of this molecule, what does CH3 represent? • A 1 carbon and 3 hydrogens • B 3 carbons and 3 hydrogens • C 1 calcium and 3 heliums • D 3 chlorines
  4. 4. • Carbon • Hydrogen • Oxygen • Answer: 3 How many elements are present in the following reaction? C3H8 + 5O2 -> 3CO2 + 4H2O
  5. 5. Which could be a description of the subatomic particle found at location X? • A. It has mass but no charge. • B. It has no mass and a positive charge. • C. It has a large mass and a negative charge. • D. It has no mass and an equal number of positive and negative charges.
  6. 6. A student observes some sugar as it is heated and burns. The student concludes that a chemical reaction has occurred. Which of the following observations about the burning sugar provides evidence of a chemical reaction? A. Heat is added to the sugar crystals. B. The sugar melts and becomes liquid. C. The temperature of the sugar increases. D. Gas is produced as the sugar turns black.
  7. 7. In the diagram, a wind turbine is transferring energy from the wind. Between which two steps in the diagram is mechanical energy being converted into electrical energy? A. 1 and 2 B. 2 and 3 C. 3 and 4 D. 4 and 5

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