What is usually released as a product in a combustion reaction?
a.) elemental oxygen
b.) elemental carbon
c.) energy
d.) a carbon- based fuel
which of the following best describes why mnso4 > mno is not a synthesis reaction?
a.) energy is not a product in this reaction
b.) the reaction has more than one product
c.) oxygen is not a reactant in this reaction
d.) the equation is not balanced
a reaction that is essentially the opposite of synthesis reaction describes which of the following?
a.) displacement
b.) combustion
c.) decomposition
d.) oxidation-reduction
double displacement reactions are often defined by which of the following?
a.) release of light
b.) use of oxygen as a reactant
c.) formation of a precipitate
d.) breakdown of only one compound

water and alcohols have similar properties because water molecules contain hydroxyl groups that can form hydrogen bonds with other water molecules and with alcohol molecules, and likewise alcohol molecules can form hydrogen bonds with other alcohol molecules as well as with water.

a. the law of proportion states the combination of 2 atoms in a specific ratio to produce multiple compounds such as the given statement of question ‘1st compound contains 88.8 % cu ’ indicates 88.8 g of cu is present along with 11.2 g oxygen in 100 g of compound whereas the statement ‘2st compound contains 79.9 % cu ’ indicates 79.9 g of cu is present along with 20.1 g oxygen in 100 g of compound

1st compound contains 88.8 g cu

for cu

m = 63 g /mol

atomic % = 88.8 /63 = 1.42

for o

m = 16 g /mol

atomic % = 11.2 /16 = 0.7

b. the emperical formula of 1st compound is

cu1.4o0.7

cu2o