EMERGENCY! WILL GIVE 100 POINTS AND BRAINLIEST TO FASTEST CORRECT ANSWER! Write chemical equations for the following single-replacement reactions that might occur in water. If no reaction occurs, write NR in place of the products.
a.) nickel + magnesium chloride
b.) calcium + copper (II) bromide
c.) potassium + aluminum nitrate
d.) magnesium + silver nitrate

Explanation:

A)  No reaction occurs. It is really hard to replace Mg once a reaction has taken place. (NR)

B) Ca + Cu(ii)Br2 ==> Cu + CaBr2.  Calcium only ionizes to Ca2+

C) 3K + Al(NO3)3 ===> Al + 3KNO3   Potassium is very reactive.

D) Mg + AgNO3  > Mg(N03)2 + Ag

A. oxygen gas, liquid water, liquid honey, solid iron ore

Explanation:

Oxygen (O2) and liquid water (H2O) are made up of very weak bonds, thus making their attraction very weak. Solid iron ore is, quite obviously, stronger, denser, and more attracted than liquid honey is.