Explain why we used baking soda in our solution

Which statement describes james chadwick’s discovery.

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?

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)