A student was trying to produce hydrogen gas. Figure 1 shows the apparatus she used.
No gas was produced.
The student's teacher said that this was because the substances in the flask did not
react.

Suggest why the substances in the flask did not react.

In an investigation that uses the scientific method, which step immediately follows making a hypothesis? o summarizing the results o asking a question o making observations designing an experiment mark this and retum save and exit next submit

Plz mark brainliest 30 points 1) find the momentum of a 12 kg snowball that is rolling with a velocity of 9 m/s. 2) an 8 ball with a mass of .5 kg is sitting at rest. it is hit by the cue ball (1 kg) traveling at 2.5 m/s. if the cue ball is at rest after the collision, how fast is the 8 ball traveling after the collision? 3) two football players are running toward each other. if the offensive player is 75 kg and is running 8 m/s, how fast must the 60 kg defensive player run in order for the two players to hit and stop?

How would the number of moles (n) of o2 change if the atmospheric pressure doubled but all other variables stayed the same