Here is the answer to your question^. I hoped that I have answered you questions.
Answer:
Ne 20: 10
and
Ne 22: 12
Explanation:
Ne-20:
N = A - Z = 20 - 10 = 10 neutrons
Ne-22:
N = A - Z = 22 - 10 = 12 neutrons
N: number of neutrons
A: mass number
Z: atomic number
Air is a mixture because it is made up of many constituents like oxygen, argon etc. it can be physically separated by fractional distillation. it doesnt have a formula unlike compounds and elements. its composition varies differently with its constituents.
A control sample serves as a sample used to eliminate errors or minimize them. Also, it is used to prevent the effect of one parameter which is not the subject being studied. For instance, in an adsorption experiment a control sample is always included wherein in a flask it only contains the adsorbate solution. The said sample is responsible for calculating how much of the adsorbate is being adsorbed on the sides of the flask.
Hey there!
N₂H₄ + O₂ → NO₂ + H₂O
First, balance N.
Two on the left, one on the right. Add a coefficient of 2 in front of NO₂.
N₂H₄ + O₂ → 2NO₂ + H₂O
Next, balance H.
Four on the left, two on the right. Add a coefficient of 2 in front of H₂O.
N₂H₄ + O₂ → 2NO₂ + 2H₂O
Lastly, balance O.
Two on the left, six on the right. Add a coefficient of 3 in front of O₂.
N₂H₄ + 3O₂ → 2NO₂ + 2H₂O
This is our final balanced equation.
Hope this helps!