Practice Quiz

MCAS Biology Practice - Question List

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246. Which of the following is an example of a chemical change?
  1. burning a scented candle
  2. cutting an apple into slices
  3. freezing liquid water into an ice cube
  4. melting a stick of butter to pour over popcorn
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247. Which of the following describes a particle that contains 36 electrons, 49 neutrons, and 38 protons?
  1. an ion with a charge of 2 -
  2. an ion with a charge of 2 +
  3. an atom with a mass of 38 amu
  4. an atom with a mass of 49 amu
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248. The final elements produced by radioactive decay differ from the original radioactive elements because the nuclei of the fi nal elements are always
  1. more stable.
  2. increased in mass.
  3. half as radioactive.
  4. positively charged.
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249. Block X and Block Y have the same mass. Both blocks are placed into a container of pure water. Block X fl oats in the water, and Block Y sinks to the bottom of the container. Which of the following statements is an accurate conclusion from this demonstration?
  1. Block Y is heavier than Block X.
  2. Block Y is less dense than Block X.
  3. Block Y has a smaller volume than Block X.
  4. Block Y would float if more water were added.
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250. Concrete is composed of Portland cement, rocks, sand, and water. Which of the following best describes concrete?
  1. an element
  2. a compound
  3. a homogenous mixture
  4. a heterogeneous mixture
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