1) Which of the following describes a chemical reaction? a) Rocks split apart over many years due to weathering b) Ice melts into water c) Carbon diaxide freezes to make dry ice d) Oxygen interacts with iron to form rust 2) 4 grams of hydrogen and 32 grams of oxugen will combine to form: a) 36 grams of deuterium b) 36 grams of water c) 32 grams of oxygen d) 28 grams of hydroxide 3) When sodium and chlorine combine to form sodium chloride, sodium chloride is the: a) produce b) originator c) reactant d) product 4) The law of conservation of mass says substances can neither be _____________ nor ________________ . a) condensed / extracted b) created / destroyed c) built / torn down d) blended together / separated 5) In science, a law is... a) ... a legal document that describes a rule of conduct. b) ... a rule governing what you are permitted to do.  c) ... a statute enacted by a elgislative body. d) ... a generalisation about how the physical universe works. 6) What was Antoine Lavoisier's contribution to the law of conservation of mass? a) He came up with a widely-read, precise description. b) He was the first person to propose it in a scientific way. c) He was the first person to think of it. d) He was the first person to perform a chemical reaction.

Year 9 - Conservation of Mass

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