Which is the balanced chemical equation representing the synthesis of hydrogen gas and oxygen gas? h2 o2 h2o
a. h2 o2 h2o
b. h2 o2 2h2o
c. 2h2 o2 2h2o
d. 2h2 2o2 2h2o

Which of these would be caused by a chemical change? a) the formation of lava. b) sedimantary rock layering over time. c) metamorphic rock forming from igneous. d) metamorphic rock eroding to form sedimentary rock.

Between 2014 and 2016, more than 25,000 children in flint, michigan, drank water that was contaminated with lead from lead pipes. during this time, the city claimed the water was safe to drink. which of these actions could the city have taken to ensure that the drinking water was free from lead?

The peak wavelength for the blackbody curve of a star is in the uv range. assuming the radiation from this star can reach earth, would you be able to see it?