Burning coal produces what type of gas? oxygen hydrogen carbon dioxide nitrogen

Two friends at different locations want to communicate with each other by sending low energy signals. which of the following methods can they use to communicate? a) produce x-rays using colliding electrons and send them to radios, which capture sound b) send messages using infrared radiation, which travel in the form of waves c) send radio waves through intervening media like radio and television d) produce sound waves using microwaves from heated objects

Summarize possible ways in which phases of matter could combine to form a solution.

Which of the following substances is the most soluble in water? a. sodium chloride b. methane c. bromine d. carbon