HELP? There’s 4 questions about the graph???

How do i complete this electrolysis of water lab? i’m at home, so i don’t have the materials, and the lab didn’t properly work and was incomplete at school.

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?

Select the word from the list that best fits the definition the nuclear family into which a person is born or adopted.