In an endothermic reaction, a drop in temperature would be observed.

true
or
false

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)

Afraction can be converted to a decimal by dividing the denominator into the numerator. use a calculator. divide to convert the fractions from part a to decimals. then describe the pattern you see in the decimal.

The hammering on a train track is often heard twice by workers farther down the track; first as the sound travels through the steel and second as the sound travels through the air. this suggests which graph is true?