In order to understand why some combinations of alkyl halides and nucleophiles give a substitution reaction, whereas other combinations give elimination, and still others give no observable reaction, we must investigate systematically the way in which changes in reaction variables perturb the course of the reaction.
It's true - the ISS moves at about 17,000 mph (~28,000 kph). Now for your other questions: 1. When it's not using its onboard engines to adjust its orbit, the station is in free-fall*. This means that gravitational interaction with the earth maintains the station's orbit, and thus its speed.
NASA is live-streaming breathtaking footage from the International Space Station It takes the space station about 90 minutes to orbit the planet, with a total of around 15 trips done every 24 hours. As the station passes into night time for 45 minutes every orbit, the live feed falls dark.