Quick Stoichiometry study

Question 1

E (energy) as a reactant

Answer 1

endothermic

Question 2

E (energy) as a product

Answer 2

exothermic

Question 3

atoms in the reactants equals

Answer 3

number of atoms in the products (law of conservation of mass)

Question 4

What does the empirical formula do?

Answer 4

shows the simplest whole ratio of atoms in a compound

Question 5

What does the molecular formula do?

Answer 5

shows the actual ratio of atoms in a compound

Question 6

steps of the empirical formula

Answer 6

1. Multiply each substance % by the total mass
2. convert mass into # of particles; (# of g)/(periodic table mass)
3. determine ratio by dividing all by the lowest value

Question 7

steps of moleular formula

Answer 7

1. Figure out the mass of the empirical formula
2. Divide molecular mass by the empirical mass
3. Multiply the result by the subscripts in the empirical formula

Question 8

synthesis reaction

Answer 8

Two or more reactants combine to form a single product

Question 9

decomposition reaction

Answer 9

a single reactant is broken down into two or more simpler substances

Question 10

single replacement reaction

Answer 10

One element replaces another in a compound

A single element is a cation, replaces a cation, and vice versa

Question 11

double replacement reaction

Answer 11

Two elements in two different compounds switch places

involves two water soluble compounds that form one soluble and one insoluble compound

acid/base neutralization

Question 12

combustion reaction

Answer 12

general form: CH + O2 –> CO2 + H2O

Question 13

law of conservation of mass

Answer 13

Matter is neither created nor destroyed in an ordinary chemical reaction

Question 14

Replacement reactions only occur if…

Answer 14

one element is more reactive than the atom already bonded