Refer to the activity series chart and determine which of the following displacement reactions can occur.
a.
2ag(s) + zn(no3)2(aq) → 2agno3(aq) + zn(s)
b.
2cu(no3)2(aq) + 2ag(s) → 2agno3(aq) + cu(s)
c.
cuso4(aq) + fe(s) → feso4(aq) + cu(s)
d.
3mgso4(aq) + 2al(s) → al2(so4)3(aq) + 3mg(s)

Look at the spectrums of a star moving towards earth and a motionless star. which of these is a correct inference that can be draw from the observation of the two spectrums? (2 points) the spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes. the spectrum of a motionless star is identical to the spectrum of a star which moves towards earth. the spectrum of a star shifts towards the red region when the star moves towards earth. the spectrum of a star shifts towards the blue region when the star moves towards earth.

To find the enthalpy of a reaction in the lab, you measured the of the reactants and the change during the reaction.

How might this scientific phenomena be explained? a paper clip floats on water.