The following equation represents what type of chemical reaction? 2Ag + H2S → Ag2S + H2

A. Double Replacement
B. Single Replacement
C. Decomposition
D. Synthesis

Is 343 in the sequence -5, -2, 1, 4, 7

As light moves from one material into the next, which of the following affects how much the light waves will refract, or bend? angle at which the ray strikes the medium color of the material density of the material temperature of the light wave

Which best describes the present-day universe? opaque, expanding very slowly, stars produce heavy elements transparent, expanding at an accelerated rate, stars produce heavy elements opaque, expanding at an accelerated rate, stars produce only hydrogen and helium transparent, expanding very slowly, stars produce only hydrogen and helium