Answer:
1. Oxygen
Total no of electrons 8
Group 6
No of valence electrons 6
Period 2
No of valence shell 2
2.Sodium
Total no of electrons 11
Group 1
No of valence electrons 1
Period 3
No of valence shell 3
3. Phosphorus
Total no of electrons 15
Group 5
No of valence electrons 5
Period 3
No of valence shell 3
Answer:
a
Explanation
Bc I took the test, good luck with that guys
Answer: true .
Explanation: All organisms are made up of one or more cells.
Answer:
A. ΔS°rxn decreases
B. ΔS°rxn decreases
C. ΔS°rxn has little or no change
D. ΔS°rxn increases
Explanation:
The change in entropy (ΔS°rxn) is related to the change in the number of moles of gases (Δn(gas) = n(gas products) - n(gas reactants)). If the number of moles of gases increases, there are more possible microstates and entropy increases. The opposite happens when there are less gaseous moles. And little or no change in entropy is expected when the number of moles of reactants and products is the same.
<em>A. K(s) + O₂(g) ⟶ KO₂(s)</em>
Δn(gas) = 0 - 1 = -1
ΔS°rxn decreases
<em>B. CO(g)+ 3 H₂(g) ⟶ CH₄(g) + H₂O(g)</em>
Δn(gas) = 2 - 4 = -2
ΔS°rxn decreases
<em>C. CH₄(g) + 2 O₂(g) ⟶ CO₂(g)+ 2 H₂O(g)</em>
Δn(gas) = 3 - 3 = 0
ΔS°rxn has little or no change
D. N₂O₄(g) ⟶ 2 NO(g) + O₂(g)
Δn(gas) = 3 - 1 = 2
ΔS°rxn increases