Molecules can be described as A mixtures of two or more pure substances. B) mixt

Question

Molecules can be described as A mixtures of two or more pure substances. B) mixtures of two or more elements that has a specific ratio between components. C) two or more atoms chemically joined together. D) heterogeneous mixtures. E) homogeneous mixtures. The Scientific Method A) is just a theory. B) is a strict set of rules and procedures that lead to inarguab C) isn't used much in modern chemistry. D) is based on continued observation and experiment. E) is a framework for proving an argument you know to be true. Which of the following are examples of a chemical change? A) coffee brewing B) water boiling C) leaves turning color in the fall D) salt dissolves in water E) None of the above are chemical changes.

Explanation / Answer

1) Option B) best describes the molecule, mixture of two or more elements that has specific ratio between components
2) The scientific method is based on observation and experiment, Option D
3) Any change that results in formation of new substance can be called as chemical change.
   Salt dissolving in water is associated with dissociation of ions while others involve a physical change.
   So option D is the correct answer

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