<span>A. insoluble solids in water
</span><span>C. solids of different sizes</span>
Answer:
1.428 moles
Explanation:
If 0.0714 moles of N2 gas occupies 1.25 L space,
how many moles of N2 have a volume of 25.0 L?
Assume temperature and pressure stayed constant.
we experience it 0.0714 moles: 1.25L space
x moles : 25L of space
to get the x moles, cross multiply
(0.0714 x 25)/1.25
1.785/1.25 = 1.428 moles
Answer:
4 all of the choices. the rest of the answers are correct so it's all of the choices
a. <em>Monatomic ions
</em>
Cs is in Group 1. It has <em>one valence electro</em>n that it can lose to form a Cs⁺ ion.
Mg is in Group 2. It has <em>two valence electrons</em> that it can lose to form an Mg²⁺ ion.
N is in Group 15. It can gain <em>three valence electrons</em> to complete its octet and form an N³⁻ ion.
b. <em>Ionic compounds</em>
In an ionic compound there must be the same number of positive and negative charges.
It takes <em>three Na⁺ ions</em> to balance the charge on <em>one N³⁻ ion</em>, so the formula of sodium nitride is Na₃N.
It takes <em>three Mg²⁺ ions</em> (charge = +6) to balance the charge on <em>two N³⁻ ions</em>
(charge = -6), so the formula of magnesium nitride is Mg₃N₂.
Answer: Option (d) is the correct answer.
Explanation:
Endothermic process is a process in which energy or heat is absorbed by reactant species.
For example, melting of ice cubes is an endothermic process as it is absorbing heat from the surrounding and gives a cooling effect.
Thus, we can conclude that the process in which a substance gains energy is an endothermic process.