Physical and chemical properties and changes

Answer Key - Grade 10 Science Worksheet

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

1. 1.

   5.6 g of iron rusts completely by joining with 2.4 g of oxygen from the air. What mass of rust forms, Ari?

   8 g
2. 2.

   11.2 g of iron rusts completely by joining with 4.8 g of oxygen from the air. What mass of rust forms, Bo?

   16 g
3. 3.

   2.8 g of iron rusts completely by joining with 1.2 g of oxygen from the air. What mass of rust forms, Esme?

   4 g
4. 4.

   Batter of egg and flour bakes into a firm, brown cake. What kind of change is that, Kira?

   • Physical: it just dries out
   • Chemical: it can't be unbaked
   • Physical: the batter just melts
5. 5.

   A candle flame gives off light and heat. What do these signs suggest, Luz?

   • A chemical change
   • No change
   • Just melting of the wax
6. 6.

   Is mass an intensive or an extensive property, Milo?

   • Intensive
   • Neither
   • Extensive
7. 7.

   Is water's boiling point an intensive or an extensive property, Noah?

   • Extensive
   • Intensive
   • A chemical property
8. 8.

   Why do intensive properties help identify a substance, Pia?

   • They are easy to weigh
   • They don't depend on amount
   • They change with the sample's size
9. 9.

   A burning candle gets lighter. Where does the mass go, Ren?

   • Into the flame's light
   • It is destroyed
   • Into gases in the air
10. 10.

    A candle burns inside a sealed jar on a balance. What happens to the reading, Tala?

    • It stays the same
    • It rises a lot
    • It drops a lot