While the other pairs, sodium and potassium are the metals, nitrogen and iodine, chlorine and bromine, helium and oxygen are the non-metals. They do not form ionic bond. Hence, the correct pairs of elements likely to form ionic compounds are, potassium and sulfur, magnesium and chlorine
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The answer is:
There are 0.209 moles of Cu in 13.g of Cu
Why?
To calculate how many moles does a sample of any element has, we need to use its atomic mass
We are working with Copper (Cu), so we need to find its atomic mass to calculate how many moles does 13.3 g of Cu contains.
So, calculating we have:

We have that there is 1 mol per 63.54 grams of Cu.
Now, converting we have:

We have that there are 0.209 moles of Cu in 13.g of Cu
Have a nice day!
Answer:
lol I hate chemical but let me give some advice
Explanation:
Please go on Khan Academy or look at your notes and I promise you can figure out! Seriously, I am trying to be helpful not like the annoying teacher that says "figure it out"
Answer:
Change in velocity (\Delta v) is acceleration (a) times time (t)
Acceleration a=1.2\ m/s^{2}
Time t=10\ s
So \Delta v=at=1.2\ m/s^{2}*10\ s=12\ m/s
The initial velocity is then 16\ m/s-12\ m/s=4\ m/s
Easy Answer: 4m/s
Explanation: