Two clear liquids are poured into a beaker. which is a clear sign that a precipitation reaction has occurred?
a. bubbles appears in the solution.
b. the beaker becomes hot to the touch.
c. a thick, cloudy blue layer forms on the top of the solution.
d. an odor is emitted from the beaker.

A because gas releases are visible reactions

The soviet union beat the us to the first successful launch, with the october 4, 1957, orbiting of sputnik 1, and later beat the us to have the first human in earth orbit, yuri gagarin, on april 12, 1961. the "race" peaked with the july 20, 1969, us landing of the first humans on the moon with apollo 11

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