It remains constant. (stays the same)
Oxygen, should be correct
sometimes we use and need mandatory
Talc is needed to make baby powder.
Aluminum bromide should be written as AlBr₃ since we are told that there are 3 atoms of Br for every atom of Al.
I hope this helps. Let me know if anything is unclear.
To find the velocity, you would have to divide the meters given by the seconds given.
500 meters / 50 seconds = 10 meters per second.
Your answer would be 10 m/s
Hope this helps!
