Exploring Matter and Energy

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Questions and Answers

Which one of these is the correct equation to prepare 500 mL of a 3 M NaCl solution?

  • $m = \frac{1000},{M \cdot V}$
  • $m = \frac{M \cdot 1000},{V}$
  • $m = \frac{M \cdot V},{1000}$ (correct)
  • $m = \frac{V},{M \cdot 1000}$

What is a graduated cylinder used for?

  • Measuring volume (correct)
  • Measuring temperature
  • Measuring time
  • Measuring mass

When a reaction in solution produces energy, what happens to the temperature of the solution?

  • The temperature increases (correct)
  • The temperature fluctuates
  • The temperature remains constant
  • The temperature decreases

What entropy changes occur when a substance melts?

<p>Entropy increases (B)</p> Signup and view all the answers

How are kinetic energy and potential energy different?

<p>Kinetic energy is the energy of motion, while potential energy is the energy of position (B)</p> Signup and view all the answers

What energy changes occur to a mass that starts from rest and slides without friction from the top to the bottom of an inclined plane?

<p>Potential energy increases and kinetic energy increases (B)</p> Signup and view all the answers

How are physical changes in a substance different from chemical changes?

<p>Physical changes involve a change in state, while chemical changes do not (D)</p> Signup and view all the answers

How many neutrons are in 14 6 C?

<p>8 (C)</p> Signup and view all the answers

What is an example of a nuclear reaction involving alpha decay?

<p>$^{238}<em>{92}U ightarrow ^{234}</em>{90}Th + ^4_2He$ (B)</p> Signup and view all the answers

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