3.25 mini quiz

Question 1

what is a specific type of synthesis reactions? give an example

Answer 1

• where group 1 or 2 metal oxides react with water to form hydroxides (strong bases)
• ex. Na2O+H2O—->2NaOH

Question 2

what are all the different types of decomposition reactions? give examples of all 4.

Answer 2

• binary compounds break apart into its component elements (ex. 2HgO–>2Hg+O2)
• carbonates break down into a metal oxide and CO2 (ex. CaCO3–>CaO+CO2)
• chlorates break down into a chloride and CO2 (ex. 2KClO3–>2KCl+3O2)
• group 1 or 2 metal hydroxides break down into a metal oxide and water (ex. Ca(OH)2–>CaO+H2O)

Question 3

What do carbonates break down into? Give an example

Answer 3

into a metal oxide and CO2 (ex. CaCO3–>CaO+CO2)

Question 4

What do chlorates break down into? Give an example

Answer 4

into a chloride and O2 (ex. 2KClO3–>2KCl+3O2)

Question 5

What do group 1 or 2 metal hydroxides break down into? give an example

Answer 5

into a metal oxide and water (ex. Ca(OH)2 (aq)–>CaO (aq)+H2O (l)

Question 6

what are some notable things abt the general oxidation number rule

Answer 6

• hydrogen takes a -1 charge with metals
• group 13 elements usually have an oxidation number of +3, group 14: +4, group 15: +5, group 16: +6)
• halogens (group 17) can be + if bonded to oxygen or fluorine
• oxygen is -1 in peroxide (O2^-2)
• oxygen can be +1 or +2 when bonded to fluorine

Question 7

the reduced atom/oxidizing agent ALWAYS________________so therefore it must______________________

Answer 7

gains electrons, be more electronegative