Find the theoretical yield of silicon carbide if 50.0 grams of silicon dioxide reacts with 79.0 grams of Carbon.

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.

How many grams of oxygen gas are contained in a 15 l sample at 1.02 atm and 28°c? show your work.

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)