The formula of a compound is 
Given:
The ions
and 
To find:
The formula for ions
and 
Solution:
The ion with a positive charge (cation) = nickel ion = 
The ion with a negative charge (anion) = nitrate ion = 
Valency on nickel ion = 2
Valency on nitrate ion = 1
Using the criss-cross method as shown in image
The formula of a compound : 
The name of a compound is nickel(II) nitrate

The formula of a compound is 
Learn more about ions here:
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Saturated has only 1 c to c bond while unsaturated has 2 or 3 c to c bond
Answer:
First option
Explanation:
Students 1 and 2 have precise measures yet is is not accurate since they measure around 5.
For a first order reaction, the half life is inversely proportional to the rate constant.
The formula is
half life = ln(2)/k = 0.693/k
where k is the rate constant
t = 5.50 minutes
k = ln(2)/5.50 = 0.126 min^-1
Your rate constant is 0.126 min^-1.
Answer:
Kinetic energy is an energy that can be applied to another object, often considered the energy of motion.
Explanation:
Metals are generally good conductors of heat.