Answer:
oxygen-13 oxygen-14
Explanation:
there are several radioactive
Controlled variables: do not change as they must be held constant
Independent variables: are controlled and manipulated
Dependent variables: effected by changes to the independent variable
Answer: A form of precipitation requires melting and refreezing as they fall towards the ground.
Explanation: The hail begins as rain and freezes as it falls down to the surface.
Answer:
c) non polar Covalent
Explanation:
this is a molecule formed by atoms of the same element . they both have similar electronegativities and thus cancel out . This makes it a perfect Covalent molecule . The fact that it's a symmetrical molecule makes it non polar. a symmetrical molecule is a molecule formed by the overlap of orbitals of two atoms of the same element ( that is to say , there's no dipole )
The answer is A. Ionic bonds