The main acidic component in ketchup is vinegar, which contains acetic acid. Acids can dissolve rust by breaking down the ...

It looks like the nail has rusted but this colour is not rust – it's actually copper. So what has happened? Iron is more reactive than copper. The iron pushes copper out of its compound – iron ...

Iron is the main ingredient in various forms of iron ... forms a number of organic and inorganic compounds and can be found in coal, petroleum and limestone. It is the principle strengthening ...