What type of matter is 100 grams of sodium chloride a) homogenous mixture b) heterogeneous mixture c) pure substance that is an element d) pure substance that is a compound

What are the similarities of physical and chemical change ?

Which statement best describes isomers? a. isomers are alcohols that have the same functional group. b. isomers have at least one carbon-carbon double bond. c. isomers have the same molecular formula but different structural properties.

Which statement is true about the model of the electromagnetic spectrum a: it change the frequencies of light. b: it compare wavelengths of light. c: the color of light waves can be changed using the model. d: the intensities of light waves can be decreased using the model.