-2 cuz 20 negative minus 18 positive is -2
Answer:
Explanation:
Which is more reactive hydrogen or oxygen?
Hydrogen is not particularly reactive. For example, just mixing hydrogen and oxygen gas will not cause a reaction at room temperature, but many metal elements oxidize at least on the surface in air. ... It is combustible because oxygen wants electrons and takes them from hydrogen to form water.
Density = Mass of Object / Volume of water displaced.
The volume of water displaced is the same as the volume of the object.
Density = 118 g / 25 ml
= 4.72 g/ml
But 1 liter = 1000 cm³
1 mL = 1 cm³
Density = 4.72 g/ml = 4.72 g/cm³
