Unit 1 Section D Summary HW Problems Pt. 1

#3:
a. Two molecules of hydrochloric acid are combined with one atom of magnesium to produce one atom of hydrogen and one atom of magnesium chloride.
b. HCl is a compound, Mg is an element, H2 is an element, and MgCl2 is a compound.
c.

#1:
a. 

b. 

c.  (a) A molecule of hydrogen is combined with a molecule of chlorine to form two molecules of hydrochloric acid. (b)  Two molecules of hydrogen peroxide are formed when two molecules of water react with one molecule of oxygen.

#3:
The law of conservation of matter says that in a chemical reaction, matter is neither created nor destroyed.

#5:
a. 

b.

c.

#1:
a. One molecule of methane combines with two molecules of oxygen to produce one molecule of carbon dioxide and two molecules of water. 
b.

c.

d.

#2:

a. One molecule of hydrobromic acid combines with magnesium to produce one molecule of hydrogen and one molecule of magnesium bromide.

b.

c.

d.

#3:

a.  Four molecules of silver, four molecules of hydrogen sulfide and one molecule of oxygen combine to produce two molecules of silver sulfide and four molecules of water.

b.

c.

d.

#4:

a.  One molecule of the ore hematite combines with three molecules of carbon oxide to produce two molecules of iron and three molecules of carbon dioxide.

b.

c.

d.

#5:

a.  Two molecules of aluminum combine with six molecules of hydrochloric acid to produce two molecules of aluminum chloride and three molecules of hydrogen.

b.

c.

d.