1. Which statement BEST explains why coal is used to generate electricity despite the amount of pollution produced by burning coal?
A Compared to other fuels, coal produces more energy per kilogram.
B. Compared to other fuels, coal is relatively cheap and plentiful.
C. Coal burns without producing greenhouse gases.
D. Coal is a renewable source of energy.

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

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.

What is the chemical formula for dihydrogen monoxide