Chemical Reactions

Question 1

is an expression that uses
chemical formulas and other symbols to illustrate
what reactants constitute the starting materials in a
reaction and what products are formed.

Answer 1

chemical equation

Question 2

the reactants are written to the

Answer 2

left

Question 3

the products are written to the

Answer 3

right

Question 4

show the number of molecules of
a given element or compound that react or are
formed.

Answer 4

Coefficients

Question 5

states that
atoms cannot be created or destroyed in a
chemical reaction.

Answer 5

the law of conservation of mass

Question 6

are used to balance an equation

Answer 6

coefficents

Question 7

symbols used in chemical equatios meaning

—–>

Answer 7

reaction arrow

Question 8

symbols used meaning
(s)
(l)
(g)
(aq)

Answer 8

solid
liquid
gas
aqueous solution

Question 9

types of chemical reaction

Answer 9

1. Combination or Synthesis
2. Decomposition
3. Single Replacement Reaction
4. Double Replacement Reaction
5. Combustion
6. Reduction-Oxidation Reaction

Question 10

two or more substances react to form a single product

Answer 10

Combination or Synthesis

Question 11

a single compound breaks down into two or more simpler substances (elements or compounds)

Answer 11

Decomposition

Question 12

•one element replaces another element in a compound

• more active element replaces less active element
• Refer to activity series of elements

Answer 12

single displacement

Question 13

Reaction of a compound with excess oxygen in the presence of heat that results in the release of heat or light energy.

Answer 13

Combustion Reaction

Question 14

2 types of combustion

Answer 14

• complete

* incomplete

Question 15

Also called “clean combustion,”

Answer 15

complete combustion

Question 16

Also called “dirty combustion,”

Answer 16

incomplete combustion

Question 17

A common type of chemical reaction involves the transfer of electrons from one element to another.
•When iron rusts, methane and wood burn, and a battery generates electricity, one element gains electrons and another loses them.

Answer 17

Reduction-Oxidation Reactio

Question 18

generates a small electrical impulse that triggers the heart to beat.

Answer 18

peacemaker

Question 19

A reaction that can be made to go in either direction.

Answer 19

reversible reaction

Question 20

A dynamic state in which the rate of the forward reaction is equal to the rate of the reverse reaction.

Answer 20

equilibrium

Question 21

When a stress is applied to a chemical system at equilibrium, the position of the equilibrium shifts in the direction to relieve the applied stress.

Answer 21

LE CHATELIER’S PRINCIPLE

Question 22

Each of these processes can be written as individual reactions, called _____, to emphasize which electrons are gained and lost.

Answer 22

half reactions

Question 23

three types of stress that can be applied to a chemical equilibrium

Answer 23

• addition of reaction component
• removal of reaction ckmponent
• chang in temperature

Question 24

’ sense when the heart beats normally and provide an electrical signal only
when the heart rate slows.

Answer 24

peacemaker

Question 25

Such devices are called “demand” pacemakers, and they quickly replaced earlier “fixed” rate models that continuously produced impulses to set the heart rate at a fixed value.

Answer 25

peacemaker

Question 26

is the oxidation of a hydrocarbon that produces only carbon dioxide and water

Answer 26

complete combustion

Question 27

is hydrocarbon oxidation that produces carbon monoxide and/or carbon (soot) in addition to carbon dioxide

Answer 27

incomplete combustion

Question 28

compound that gains electrons while csausing another compound to be oxidized is called

Answer 28

oxidizing agent