2 HCI --> H2 + C12
What is the energy change for the decomposition of hydrogen chloride

Aradio signal from a gps satellite take only about 0.067 seconds to reach a gps reciever. if the speed of light is about 300,000km/s, then approximately how far away is the reciever from from the satellite?

Which of the following would be an accurate picture of the earth during the summer time of the northern hemisphere?

May someone me with these science questions