Can someone me with #4 and #5 ? i’ll mark you brainliest

The United States' use of nuclear weapons to end World War II led to a determined effort by the Soviet Union to acquire those weapons, leading to a long-running nuclear arms race between the two superpowers. The Soviet Union conducted its first nuclear test in 1949.

i discarded the supernatant and kept the pellet in this part of the experiment because you have to return all unused chemicals into their original containers at the end of each labratory.

explanation: