Physical and chemical properties and changes

Answer Key - Grade 10 Science Worksheet - Challenge Me

Circle the best answer, or write your answer on the line.

1. 1.

   A 27 g block with a volume of 10 cm³ is cut exactly in half. What is the density of one half, Ari?

   2.7 g/cm³
2. 2.

   A 17.9 g block with a volume of 2 cm³ is cut exactly in half. What is the density of one half, Bo?

   8.95 g/cm³
3. 3.

   A 31.6 g block with a volume of 4 cm³ is cut exactly in half. What is the density of one half, Esme?

   7.9 g/cm³
4. 4.

   What particle-level evidence shows a chemical change, Jun?

   • Particles move faster
   • Particles spread much farther apart
   • Atoms regroup into new particles
5. 5.

   What happens to water particles when ice melts, Kira?

   • They join into a brand-new compound
   • Same particles, looser arrangement
   • They split into new atoms
6. 6.

   Sugar dissolves in water. At the particle level, what happens, Luz?

   • Sugar atoms are destroyed by the water
   • Sugar turns into water
   • Sugar spreads among water particles
7. 7.

   Milo says boiling water is a chemical change because bubbles form. Agree or disagree?

   • Agree: bubbles mean a new substance
   • Disagree: steam is still water
   • Agree: boiling makes new atoms
8. 8.

   Noah says freezing water makes a new substance, ice. Agree or disagree?

   • Disagree: ice is still water
   • Agree: ice is a new compound
   • Agree: its color changes
9. 9.

   Pia says a burning candle destroys matter. Agree or disagree?

   • Disagree: the mass leaves as gases
   • Agree: fire destroys atoms
   • Agree: the wax is gone
10. 10.

    A cut apple turns brown in the air. Which kind of change is it, Zee?

    • Physical
    • A change of state
    • Chemical