Unit 1 Sec. D Summary HW

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Section D.2

3) a. Two formula units of hydrogen chloride (2 HCl) and mercury (Mg) react to produce one molecule of hydrogen (H₂) and magnesium chloride (MgCl₂).

b. The compound 2 HCl and Mg are the reactants and the compound H₂ and MgCl₂ are the products.

c.

Section D Summary

1)

c. For question 1a, one molecule of hydrogen gas (H₂(g)) and one molecule of chlorine gas (Cl₂(g)) react to produce two formula units of hydrogen chloride gas (2 HCl (g)). For question 1b, two formula units of hydrogen peroxide aqueous is broken down into two formula units of liquid water and one molecule of oxygen gas.

3) The law of conversion of matter states that matter is neither created nor destroyed in any chemical reaction or physical change.

5) a. Not balanced

b. Not balanced

c. Balanced

Section D.4

1) a. Methane (CH₄) and two molecules of oxygen (2 O₂) react to produce carbon dioxide and two water molecules.

b.

c.

Reactants	Products
1 carbon atom	1 carbon atom
4 hydrogen atoms	4 hydrogen atoms
4 oxygen atoms	4 oxygen atoms

d. Balanced

2) a. Hydrobromic acid (HBr) and magnesium (Mg) react to produce one molecule of hydrogen (H₂) and magnesium bromide (MgBr₂).

b. 

c.

Reactants	Products
1 hydrogen atom	2 hydrogen atoms
1 bromine atom	2 bromine atoms
1 magnesium atom	1 magnesium

d. Not balanced

3) a. Four molecules of silver (4Ag), four formula units of hydrogen sulfide (4 H₂S), and one molecule of oxygen (O₂) react to produce two formula units of silver sulfide (2Ag₂S) and four formula units of water (4 H₂O).

b.

c.

Reactants	Products
4 silver atoms	4 silver atoms
8 hydrogen atoms	8 hydrogen atoms
4 sulfur atoms	2 sulfur atoms
2 oxygen atoms	4 oxygen atoms

d. Not balanced

4) a. Ore hematite (Fe₂O₃) and three formula units of carbon monoxide (3 CO) react to produce two molecules of iron (2 Fe) and three formula units of carbon dioxide (3CO₂).

b. 

c.

Reactants	Products
2 iron atoms	2 iron atoms
6 oxygen atoms	6 oxygen atoms
3 carbon atoms	3 carbon atoms

d. Balanced