Answer:
Ionic bonds transfer electrons and covalent bonds share electrons.
Explanation:
Ionic bonds tend to transfer electrons completely. Take NaCl for example.
Cl has 7 valence electrons.
Na has 1 valence electron.
To stabilize themselves, either with a full 8 shells or full outer shell, Cl wants 1 electron and Na wants to lose 1 electron. So when NaCl forms, Na donates its electron to Cl.
In a covalent bond, the electrons are shared. Water can be used as an example. The electrons in water usually are around the oxygen, but sometimes it is around the hydrogens.
Answer:7.229 grams of oxygen is formed by the complete reaction of 35.23 g of metallic sodium with oxygen at 130–200 °C, a process that generates sodium oxide, which in a separate stage absorbs oxygen: 4 Na + O2 → 2 Na2O. The ozone oxidizes the sodium to form sodium peroxide.
Answer:

Explanation:
a) 400.0 mL of 0.10 M NaCl
(i) Moles of NaCl

(ii) Moles of ions
NaCl(s) ⟶ Na⁺(aq) + Cl⁻(aq)
We get 2 mol of ions from 1 mol of NaCl

b) 300.0 mL of 0.10 M CaCl₂
(i) Moles of CaCl₂

(ii) Moles of ions
CaCl₂(s) ⟶ Ca²⁺(aq) + 2Cl⁻(aq)
We get 3 mol of ions from 1 mol of CaCl₂

c) 200.0 mL of 0.10 M FeCl₃
(i) Moles of FeCl₃

(ii) Moles of ions
FeCl₂(s) ⟶Fe³⁺(aq) + 3Cl⁻(aq)
We get 4 mol of ions from 1 mol of FeCl₃

d) 200.0 mL of 0.10 M KBr
(i) Moles of KBr

(ii) Moles of ions
KBr(s) ⟶ K⁺(aq) + Br⁻
We get 2 mol of ions from 1 mol of KBr

Because they are easier to see, I guess.