'Some materials undergo change of chemical property when it
chemically reacts with another material. 2One evidence of change is
formation of a new product. For example, when a metal is exposed to
oxygen and water, rust is formed. “Another change is the formation of gas.
5This is observed when a chemical is burning. And the third evidence of
change is the release of heat. 'For instance, when a metal is soaked in
acid, heat is released, thus the metal starts to wear away. These three are
the evidence of chemical change.
4. What signal words are used to introduce the items listed in the text?
A. For example, this is, and for instance
B. Formation of new product, formation of gas, and release of heat
C. One, another, and third
D. Rusting, buming, and wearing away
5. Which sentences contain the list of evidence of chemical change?
A. 1, 2, and 8
C. 2, 4, and 6
B. 2,5, and 7
D. 3, 5, and 7​