What is the approximate age of the milky way? a. 3.5 billion years b. 4.5 billion years c. 15 billion years d. 15 trillion years

If the particles in a sample of matter have an orderly arrangement and move only in place, the sample is a

The wave shown on the electromagnetic spectrum disturb the medium it passes through a)different frequency. b)the same frequency .

Fill in the coefficients that will balance the following reaction: a0cr2(so4)3 + a1agno3 -> a2cr(no3)3 + a3ag2so4