Classification of Matter and Chemical Reactions: Study Notes

Which of the following best describes the difference between a compound and a homogeneous mixture, as illustrated in the classification of matter diagram? A. Compounds have a fixed composition, while homogeneous mixtures have variable composition. B. Compounds can be separated by physical means, while homogeneous mixtures cannot. C. Homogeneous mixtures contain only one type of atom, while compounds contain two or more types of atoms. D. Compounds are always solids, while homogeneous mixtures are always liquids.

Which of the following is an example of a heterogeneous mixture based on the images and classification of matter? A. Brass (copper and zinc) B. Water C. Water and copper D. Copper

A student observes a yellow solid forming when two clear solutions are mixed in a beaker. Which type of evidence for a chemical reaction does this represent? A. Change in color B. Formation of a gas C. Formation of a solid (precipitate) D. Production of heat