Which of the following accurately explain the sequence of lightning and thunder?

Zoe is investigating the composition of substance a, an unknown substance. using chemical processes, she analyzes substance a and determines it is composed of sodium, oxygen, and hydrogen atoms in a ratio of 1 : 1 : 1. what is substance a? a. a compound b. an element c. a heterogeneous mixture d. a homogeneous mixture

When a septic tank backs up a goes in to clean it out

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.