Question

can nif₂ react with k to produce kf and ni? why or why not?
a) yes, because k has lower activity than ni
b) no, because f and ni have the same activity
c) yes, because k has higher activity than ni
d) no, because ni and k have lower activity than f
question 2 (5 points)
listen
when nacl is dissolved in water, it separates into na⁺ and cl⁻ ions, which are also dissolved in water. how would the phase of the nacl, the na⁺, and the cl⁻ be written in the reaction equation?
a) (aq)
b) (g)
c) (s)

Explanation:

• For the first question: In a single - replacement reaction, a more active metal can replace a less active metal from its compound. Potassium (K) is more active than nickel (Ni) according to the metal activity series. So, K can react with \(NiF_2\) to produce \(KF\) and \(Ni\) (the reaction is \(NiF_2 + 2K=2KF+Ni\)).
• For the second question: When a substance is dissolved in water (aqueous solution), the phase is denoted as \((aq)\). \(NaCl\) is dissolved in water, and the resulting \(Na^{+}\) and \(Cl^{-}\) ions are also in an aqueous environment.

Answer:

1. C. Yes, because K has higher activity than Ni
2. A. (aq)