Question

12. Complete each of the following word equations for synthesis reactions.

a. sodium + oxygen -> ___
b. magnesium + fluorine -> ___
13. Complete and balance the equations for the decomposition reactions.
a. HgO -> [with the triangle heat symbol above the arrow] _____
b. H2O(l) -> [with "electricity" written above the arrow] _____

Answer 1

For synthesis reactions, sodium reacts with oxygen to form sodium oxide (Na₂O), and magnesium reacts with fluorine to form magnesium fluoride (MgF₂). For the decomposition of HgO with heat, it yields mercury and oxygen gas, while the electrolysis of water with electricity produces hydrogen and oxygen gases.

Step-by-step explanation:

To complete the word equations for synthesis reactions:

• a. sodium + oxygen -> sodium oxide (Na₂O)
• b. magnesium + fluorine -> magnesium fluoride (MgF₂)

To complete and balance the equations for the decomposition reactions:

• a. HgO -> Hg (l) + O₂ (g) [Balanced as written, with the triangle indicating that heat is applied.]
• b. H₂O(l) -> 2H₂(g) + O₂(g) [Balanced equation for the electrolysis of water, with 'electricity' indicating that an electric current is applied to decompose water into hydrogen and oxygen gases.]

Answer 2

Step-by-step explanation:

12)

a) Sodium + oxygen = ?

When sodium reacts oxygen its forms sodium oxide as a product.

`4Na(s)+O_2(g)\rightarrow 2Na_2O(s)`

b) magnesium + fluorine = ?

When magnesium reacts with fluorine its forms magnesium fluoride as a product.

`Mg(s)+F_2(g)\rightarrow MgF_2(s)`

13)

a)
`2HgO(s)\overset{\Delta }\rightarrow 2Hg(l)+O_2(g)`

Decomposition of mercury(II) oxide on heating gives out mercury and oxygen gas.

b)
`2H_2O(l)\overset{Electricity}\rightarrow 2H_2(g)+O_2(g)`

The electrolytic decomposition of water gives out hydrogen gas amd oxygen gas.