Does universe grow more and more over time and is there something beyond it ?

What is the relation between concentration of reactants and the rate of chemical reaction?

In the reaction between a crushed antacid tablet and vinegar what gas is emitted

Diffraction is when light is bent around obstructions. which of the these observation about clouds would indicate diffraction? a) after rain storms, you can sometimes see rainbows. b) clouds are white or gray and cannot be seen through. c) on a cloudy day, the temperature tends to be cooler than a sunny day. d) the edges of dark clouds appear lighter. this