Lecture 13 - Chemical Reactions

Question 1

what is dalton’s second postulate?

Answer 1

atoms can be separated, joined, or be rearranged but not changed into other elements

Question 2

what is a combination reaction?

Answer 2

multiple reactants join together to become a single product (ex. Na2O + H2O becomes 2NaOH)

Question 3

what is a decomposition reaction?

Answer 3

a single reactant breaks down into multiple products (ex. 2Ag2O becomes 4Ag + O2)

Question 4

what is a single-displacement reaction?

Answer 4

a more reactive element replaces a less reactive element in a compound. “cheater reaction.” (ex. Mg + 2HCl becomes H2 + MgCl)

Question 5

what is a double-displacement reaction?

Answer 5

two ionic compounds “trade” partners. one or more of these products is always formed or there is no reaction. (ex. AgNO2 + NaCl becomes AgCl + NaNO2)

Question 6

what is a combustion reaction?

Answer 6

an element or compound reacts with oxygen gas to produce heat and light.

Question 7

what is a complete combustion?

Answer 7

a hydrocarbon reacts with an oxygen gas to produce water and CO2 (ex. C7H16 + O2 becomes CO2 + H2O)

Question 8

combustions work differently with…

Answer 8

metals vs. hydrocarbons