If there was an alternate universe with a slower rate of expansion than ours, and assuming that the laws of physics of our universe would work similarly in that universe, would the molecular and/or subatomic structure of various substances and elements become denser, due to the universe being much smaller and compact than ours? For example, the element Xenon being liquid or even solid at our room temperature.

Also, would the laws of motion or relativity be more, should I say, stiff? Like, gravity would be stronger on an Earth-sized planet than here, or it would require more force to move something due to there being more resistance, or resistance being more abundant?

Basically, if the Big Bang Theory is basically about all the energy and matter in a universe being compressed together into a very small form which then rapidly expanded into a universe, with energy and matter diffusing through all the space it can, then if the rate of expansion becomes bigger or smaller, would physics and chemistry and even mathematics function much differently than it does here?

By my understanding, assuming everything else was the same aside from the slower rate of expansion, the overall density of the universe would increase, but we wouldn't see much difference at our scale. The only thing that I would think would be different is the effects of gravity on stellar formations, and that's less an intrinsic property and more of the fact that everything is simply closer to everything else.