Which statement explains why the same side of the moon is visible from earth every night?
The moon's rotational period is equal to its orbital period.
The moon's rotational period is twice that of its orbital period.
The moon's rotational period is half that of its orbital period.
The moon's rotational period and orbital period are unequal.

Here’s one way to follow the scientific method. place the missing steps in the correct position in the process

For a research project, a student decided to test the effect of the lead(ii) ion (pb2+) on the ability of salmon eggs to hatch. this ion was obtainable from the water‐soluble salt, lead(ii) nitrate, which the student decided to make by the following reaction. pbo(s) + 2 hno3(aq) → pb(no3)2(aq) + h2o losses of product for various reasons were expected, and a yield of 86.0% was expected. in order to have 5.00 g of product at this yield, how many grams of pbo should be reacted? (assume that sufficient nitric acid, hno3, would be used.)

One nanometer is equal to how many meters?