Did you know that cement is one of the three ingredients in concrete? Concrete is made up of aggregates (sand, gravel, etc.), water, and cement (as in Portland Cement).
So next time, instead of saying "Cement sidewalk," say "Concrete sidewalk" and you will be using the correct vocabulary!
The thing that kills me is that people on remodeling shows on networks like HGTV and TLC, people who should know the difference between concrete and cement, still use "cement" incorrectly. So now knowing this tip, it will probably aggravate you as well. ;)