Physical and chemical properties and changes

Answer Key - Grade 10 Science Worksheet - Building Confidence

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

1. 1.

   A metal block has a mass of 54 g and a volume of 20 cm³. What is its density, Ari?

   2.7 g/cm³
2. 2.

   A metal block has a mass of 15.8 g and a volume of 2 cm³. What is its density, Esme?

   7.9 g/cm³

3. Read this first

   Use this

   Particle box before and after, two changes.

5. 3.

   In the particle boxes, what kind of change is Change A, Jun?

   • Chemical: brand-new particles
   • Nothing changed in the box
   • Physical: the same particles
6. 4.

   In the particle boxes, what kind of change is Change B, Kira?

   Use the picture in question 3.

   • Physical: they melt
   • Chemical: new pairs form
   • Physical: they spread out
7. 5.

   In the particle boxes, what happens to the atoms in Change B, Luz?

   Use the picture in question 3.

   • New atoms appear
   • Some of them vanish
   • They regroup into new pairs
8. 6.

   Is ice melting into water a physical or a chemical change, Milo?

   • Neither
   • Chemical
   • Physical
9. 7.

   Is an iron nail rusting a physical or a chemical change, Noah?

   • Physical
   • Chemical
   • Neither
10. 8.

    Is water boiling into steam a physical or a chemical change, Pia?

    • Chemical
    • Physical
    • Both at once
11. 9.

    Iron rusts in damp air. Is that a physical or a chemical property, Tala?

    • A chemical property
    • A measurement unit
    • A physical property
12. 10.

    Which of these is a physical property of water, Zee?

    • Its density
    • Its reaction with iron
    • Its ability to burn