What indicates the total number of molecules of an element or compound in a chemical equation? (the numbers in front of the chemical formula or chemical symbol) 2FeO3+3C>4Fe+3CO2

It is
A. Coefficients
B. Products
C. Reactancts
D. Subscripts

Predict the products butane (c4h10) + oxygen —>

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

Dumbledore decides to gives a surprise demonstration. he starts with a hydrate of na2co3 which has a mass of 4.31 g before heating. after he heats it he finds the mass of the anhydrous compound is found to be 3.22 g. he asks everyone in class to determine the integer x in the hydrate: na2co3·xh2o; you should do this also. round your answer to the nearest integ