Burning something is always a chemical change that requires a fuel and A. methane
B. carbon dioxide
C. oxygen
D. hydrogen

Select the correct answer. what is the nature of the se-cl bond in a molecule of selenium chloride (secl2) if the electronegativity value of selenium is 2.55 and that of chlorine is 3.16?

Write two balanced equations 1. dissolving of solid sodium hydroxide in water 2. the reaction of sodium hydroxide solution with hydrochloric acid

How have the greenhouse gasses increased from the year 2000 to 2018