90 elements occur naturally on earth.
D. Synthesis cause A + B --> AB
Equation: 2Na + Cl2 --> 2NaCl
Answer:
a thing that is composed of two or more separate elements ex. Acid and Water
Answer:
An element
Explanation:
Elements are not able to be separated, but everything else can, whether that be physically or chemically.
answer=H+]=10-7
explain=the same way, a solution with a pH of 5 contains 10-5mol/l of hydrogen ions, a solution with a pH of 6 contains 10-6mol/l of hydrogen ions, while the solution with a pH of 7 contains 10-7mol/l of hydrogen ions
