What states that the universe began as a point and has been expanding ever since?

Needthe meter is the standard unit for: 1) height 2) length 3) weight 4) mass

Which of the following statements about acidic water is true? a. acid has no effect on the h, o molecules. b. the solution contains a larger number of oh ions than h, o ions. c. the solution contains a larger number of h, o ions than qh ions. d. the solution contains an equal number of h, o ions and oh ions. none of the above e.

If 22.5 liters of oxygen reacted with excess of hydrogen, how many liters of water vapor could be produced?