Question 15 of 25 Cyclohexane (C6H12) is found in gasoline. It is burned for fuel in a
combustion reaction. The unbalanced combustion reaction for octane is
shown below.
C6H12 + O2 + CO2 + H2O + heat
When the reaction is balanced, how many carbon dioxide molecules are
produced for every cyclohexane molecule burned?
A. 9
B. 1
O
C. 3
D. 6
O

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.

Which of the following is the correct formula for copper (i) sulfate trihydrate? cuso4 · 3h2o cuso4(h2o)3 cu2so4(h2o)3 cu2so4 · 3h2o

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