Which of the following are chemical reactions?

-making caramel sauce
-mixing oil and vinegar to make salad dressing
-pouring chocolate sauce in to milk to make chocolate milk.
-getting a suntan

this isn't multiple choice there is more then one answer

An asteroid is discovered in a nearly circular orbit around the sun, with an orbital radius that is 2.47 times earth's. what is the asteroid's orbital period, its "year," in terms of earth years?

Unpolarized light whose intensity is 1.19 w/ is incident on a polarizer. (a) what is the intensity of the light leaving the polarizer? (b) if the analyzer is set at an angle of = 41.0∘ with respect to the polarizer, what is the intensity of the light that reaches the photocell?

What occurs during a combustion reaction