A student placed two bar magnets under a sheet of paper and added iron filings on top as shown in Figure 1. Which image shows two magnets that were placed with the north and south poles facing each other?

How many grams of co(g) are there in 74.5 ml of the gas at 0.933 atm and 30o c?

Ahydrogen atom has 1 electron. how many bonds can hydrogen form? a) 1 b) 2 c) 3 d) 4 e) 5

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)