Which of the following coefficients will correctly balance the equation below?
H20
CH4+ ___ O2 --> CO2+ _H2O
1) 3,3
2) 2,2
3) 2,3
4) 1,2

The pressure inside a hydrogen-filled container was 2.10 atm at 21 ? c. what would the pressure be if the container was heated to 92 ? c ?

Atrain travels 74 kilometers in 3 hours, and then 81 kilometers in 5 hours. what is its average speed?

The tilt of the earth's axis of rotation is responsible for the a) ocean's tides. b) size of the moon. c) brightness of stars. d) earth’s seasons.