2
lesson pretestMultiple Choice

Pretest

Question 2 • Physical Science

Cecil writes the equation for the reaction of hydrogen and oxygen. cap h sub 2 plus cap o sub 2 rightarrow cap h sub 2 cap o Why does his teacher ask him to balance the equation by including the correct coefficients?

Answer
A
to show that most molecules exist in pairs
B
to show that atoms are created in chemical reactions
C
to show that atoms are conserved in chemical reactions
D
to show that most compounds exist in pairs
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Cecil writes the equation for the reaction of…