A
why do we see different phases of the lunar cycle?
as the moon rotates around its axis, different sides of it become visible.
as earth rotates around its axis, people can see different sides of the moon.
as earth revolves around the sun, the moon is cast in different shadows by earth.
as the moon revolves around earth, the different amounts of the sunlit side faces earth.

In an oxidation-reduction reaction, oxidation is what happens when a reactant

Select the correct answer from each drop-down menu.describe what happens to a carbon-11 atom when it undergoes positron emission.the decay of a carbon-11 atom _1_, and this causes it to emit _2_.options for 1: > changes a neutron into a proton> changes a proton into a neutron> is hit with a neutron> reconfigures its protons and neutronsoptions for 2: > a negatively charged electron-sized particle> a positively charged election-sized particle> two atoms and several neutrons> two neutrons and two protons

Sodium sulfate dissolves as follows: na2so4(s) → 2na+(aq) + so42- (aq). how many moles of na2so4 are required to make 1.0 l of solution in which the na concentration is 0.10 m?