unit 2: chapter 4

Question 1

evidence of chemical reactions

Answer 1

change in colour, energy is released, gas is produced, precipitate

Question 2

a change in colour is not always reliable

Answer 2

especially when combining things with water

Question 3

law of conservation of mass

Answer 3

total mass of reactants equals total mass of products

Question 4

word equations in chemical reactions

Answer 4

just the names (ex. hydrogen and nitrogen)

Question 5

skeleton equations in chemical reactions

Answer 5

focus on getting the right formulas, not necessarily balanced

Question 6

balanced chemical equations in reactions

Answer 6

fully balanced, final stage

Question 7

order for balancing chemical equations

Answer 7

MINHO

Question 8

what does minho stand for

Answer 8

• metals
• polyatomic ions
• non-metals
• hydrogen, oxygen

Question 9

synthesis reactions

Answer 9

a + b => ab

Question 10

decomposition reactions

Answer 10

ab => a + b

Question 11

single displacement reactions

Answer 11

a + bc => ac + b

Question 12

double displacement reactions

Answer 12

ab + cd => ad + cb

Question 13

synthesis: metal and nonmetal form

Answer 13

solid ionic compound

Question 14

synthesis: non metal and non metal form

Answer 14

molecular compound

Question 15

synthesis: non metal and hydrogen form

Answer 15

USUALLY a molecular compound (rarely forms with group 1 metals)

Question 16

synthesis: non metal oxide and water form

Answer 16

an acid

Question 17

synthesis: metal oxide and carbon dioxide form

Answer 17

metal carbonate

Question 18

synthesis: metal oxide and water form

Answer 18

a metal hydroxide (base)

Question 19

decomposition: metal oxyanion is heated to form

Answer 19

ionic compound and gas

Question 20

decomposition: metal carbonate is heated to form

Answer 20

a metal oxide and carbon dioxide

Question 21

oxides are formed by

Answer 21

a synthesis reaction with oxygen

Question 22

single displacement: METAL and metal*nonmetal form

Answer 22

METAL*nonmetal and metal

Question 23

single displacement: NONMETAL and metal*nonmetal form

Answer 23

meta*NONMETAL and nonmetal

Question 24

single displacement: metal and water form

Answer 24

base and hydrogen

Question 25

single displacement: for a reaction to work, the DISPLACING METAL must be

Answer 25

ABOVE the displaced element (on that activity sheet)

Question 26

double displacement: acid and sulfite form

Answer 26

H2S (g) and salt

Question 27

double displacement; acid and carbonate form

Answer 27

water and carbon dioxide and salt

Question 28

double displacement: acid and sulfite form

Answer 28

water and SO2 (g) and salt

Question 29

double displacement all reaction types

Answer 29

- insoluble precipitate - produces CO2, SO2, H2S - neutralization (and water and salt are produced)

Question 30

solubility:

Answer 30

maximum solute amount that dissolves in a solvent

Question 31

solute:

Answer 31

dissolves in solvent

Question 32

solvent:

Answer 32

dissolves the solvent

Question 33

solution:

Answer 33

homogenous mixture of 2+ substances