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

Y=‐1x + 7 if y has a value of ‐24 what is the value of x?

Calculate the molar mass of aluminum oxide (al2o3). express your answer to four significant figures.

Which formula can be used to calculate the molar mass of ammonia (nh3)? molar mass of n + molar mass of h 3 × molar mass of n + molar mass of h molar mass of n + 3 × molar mass of h 3 × molar mass of n + 3 × molar mass of h