LEC 12: Types of Chemical Reaction

Question 1

process that leads to a change in substances

Answer 1

chemical reaction

Question 2

chemical reaction involves: (4)

Answer 2

• rearrangement of atoms or molecules into different structures
• breaking or forming of bonds between the outermost electrons of the atoms
• consume or release energy
• different from a physical change, which does not result in a change in substances

Question 3

symbolic representation of a chemical reaction

Answer 3

chemical equation

Question 4

chemical equations provide us with the means to:

Answer 4

• summarize the reaction
• display the substances that are reacting
• show the products
• indicate the amounts of all component substances in a reaction

Question 5

chemical reactions always involve _____

Answer 5

change

Question 6

_____, _____, and _____ rearrange to form different substances

Answer 6

• atoms
• molecules
• ions

Question 7

substances entering the reaction

Answer 7

reactants

Question 8

substances formed in the reaction

Answer 8

products

Question 9

during reactions, chemical bonds are _____ and new bonds are _____

Answer 9

• broken
• formed

Question 10

chemical equation is a ____ for a chemical change or reaction

Answer 10

shorthand expression

Question 11

chemical equation uses the ____ and ____ of the reactants and products and other symbolic terms to represent a chemical reaction

Answer 11

• chemical symbols
• formula

Question 12

placed in front of substances to balance the equation and to indicate the number of units of each substance that are reacting

Answer 12

coefficients

Question 13

conditions required to carry out the reaction may be placed ____ or _____ the arrow

Answer 13

• above
• below

Question 14

in a chemical reaction, atoms are neither _____ nor ____

Answer 14

• created
• destroyed

Question 15

_____ atoms present in the reactant must also be present in the products

Answer 15

all

Question 16

states that in a chemical reaction, mass is neither created nor destroyed

Answer 16

law of conservation of mass

Question 17

meaning and location of the symbol: +

Answer 17

• plus
• placed between substances

Question 18

meaning and location of the symbol: (g)

Answer 18

• gas
• after formula

Question 19

meaning and location of the symbol: (aq)

Answer 19

• aqueous
• after formula

Question 20

meaning and location of the symbol: (s)

Answer 20

• solid
• after formula

Question 21

meaning and location of the symbol: (Δ)

Answer 21

• heat
• written above or below the →

Question 22

meaning and location of the symbol: →

Answer 22

• yields
• between reactants and products

Question 23

meaning and location of the symbol: (l)

Answer 23

• liquid
• after formula

Question 24

meaning and location of the symbol: hv

Answer 24

• light energy
• written above →

Question 25

meaning and location of the symbol: ↑

Answer 25

• gas formation
• after formula

Question 26

4 types of chemical reaction

Answer 26

• combination
• decomposition
• single replacement
• double replacement

Question 27

two reactants combine to form one product

Answer 27

combination

Question 28

metal + oxygen → ______

Answer 28

metal oxide

Question 29

nonmetal + oxygen → ______

Answer 29

nonmetal oxide

Question 30

metal + nonmetal → ______

Answer 30

salt

Question 31

metal oxide + water → _______

Answer 31

metal hydroxide

Question 32

nonmetal oxide + water → _____

Answer 32

oxy-acid

Question 33

a single substance breaks down to give two or more different substances

Answer 33

decomposition

Question 34

metal oxide → _____

Answer 34

metal + oxygen

Question 35

metal oxide → metal oxide + ______

Answer 35

oxygen

Question 36

carbonate → _____

Answer 36

CO2 (g) or carbon dioxide

Question 37

hydrogen carbonate → _____

Answer 37

CO2 or carbon dioxide

Question 38

one element reacts with a compound to replace one of the elements of that compound

Answer 38

single replacement

Question 39

metal + acid → _____

Answer 39

hydrogen + salt

Question 40

metal + water → _____

Answer 40

hydrogen + metal hydroxide

Question 41

an atom of an element in the activity series will displace an atom of an element ____ if from one of its compounds

Answer 41

below

Question 42

metal higher in activity series ____ metal below it

Answer 42

displaces

Question 43

metal lower in activity _____ metal above it

Answer 43

cannot displace

Question 44

halogen higher in activity series ____ halogen below it

Answer 44

displaces

Question 45

B displaces D and combines with C

Answer 45

double replacement

Question 46

4 accompaniments of double displacement reactions

Answer 46

• formation of a precipitate
• release of gas bubbles
• release of heat
• formation of water

Question 47

reaction in which a substance reacts with oxygen gas, releasing energy in the form of light and heat

Answer 47

combustion

Question 48

combustion reactions must involves ____ as one reactant

Answer 48

O2

Question 49

combustion of hydrogen gas produces _____

Answer 49

vapor

Question 50

hydrogen-filled airship that suffered an accident upon its attempted landing in New Jersey in 1937

Answer 50

The Hindenburg

Question 51

many combustion reactions occur with a ____, a compound made up solely of carbon and oxygen

Answer 51

hydrocarbon

Question 52

products of combustion of hydrocarbons are always _____ and _____

Answer 52

• carbon dioxide
• water