Chemical Safety, Copper Reactions, Freezing Point Depression

Question 1

refers to the protection of people and the environment from chemical hazards

Answer 1

chemical safety

Question 2

is a type of occupational hazard that is caused by exposure to various chemicals in the workplace and other places where they are used as school laboratory and even at home

Answer 2

chemical hazard

Question 3

is the international standard agreed upon by various countries under the auspices of the United Nations in defining and classifying chemical hazards and communicating these hazards

Answer 3

globally harmonized system of classification of labeling of chemicals

Question 4

enforces the GHS

Answer 4

occupational health and safety (OHS)

Question 5

in the Philippines, is the enforcing agency under the Department of Labor and Employment (DOLE)

Answer 5

Occupational Safety and Health Center (OSHC)

Question 6

chemical hazards are classified into three main hazard groups namely

Answer 6

physical
health
environmental

Question 7

refer to chemical agents that can cause harm with or without contact

Answer 7

physical hazards

Question 8

physical hazards can be (8)

Answer 8

explosive substances
flammable liquids
flammable solids
flammable gases
oxidizing substances
toxic and infectious substances
corrosive substances
misc. dangerous susbtances to the environment

Question 9

refer to chemical agents that can deleteriously affect one’s health

Answer 9

health hazards

Question 10

health hazards can be (6)

Answer 10

acutely toxic chemicals
chemical irritants and sensitizers
mutagenic substances
carcinogenic substances
reproductive toxicants
chemical with specific target organ of toxicity (STOT)

Question 11

refer to chemicals that are particularly toxic to aquatic organisms on short-term or long-term exposure

Answer 11

environmental hazards

Question 12

made up of a red diamond in a white background with the universally-established symbol for nine general chemical hazards

Answer 12

chemical hazard symbol or pictogram

Question 13

physical hazard in detonating bomb

Answer 13

explosion hazard

Question 14

physical hazard in gas cylinder

Answer 14

gas under pressure

Question 15

physical hazard in test tube with a chemical that corrodes a metal or skin on the human hand

Answer 15

corrosion hazard

Question 16

physical hazard in flame over circle

Answer 16

oxidizers

Question 17

meaning of skull and cross bone

Answer 17

acutely toxic and poisonous substance

Question 18

meaning of suffocating head

Answer 18

general head hazard

Question 19

used for less acutely toxic chemicals which is also a health hazard

Answer 19

exclamation point

Question 20

symbol used for environmental hazard

Answer 20

dying fish and tree

Question 21

identify the GHS hazard symbol/pictogram

Answer 21

grade yourself accordingly

Question 22

process of conveying chemical hazards through chemical labeling and safety data sheets

Answer 22

hazard communication

Question 23

it is the name of the chemical product. The UN number pertains to four-digit United Nations product identifier number for hazardous material in the framework of international transport

Answer 23

product identifier

Question 24

which is the internationally-accepted unique numerical identifier assigned to all known chemical substances described in its open scientific literature

Answer 24

chemical abstract service number

Question 25

it is the hazard level associated with a chemical where “danger” signifies the most severe hazard while “warning” signifies a less severe one

Answer 25

signal word

Question 26

these are phrases that describe the hazardous nature and degree of the product that is reflected on the chemical’s SDS

Answer 26

hazard statement

Question 27

these are phrases that describe the general precautions in the use, storage, and/or disposal of a chemical which is also reflected in its SDS

Answer 27

precautionary statement

Question 28

it gives the name, address, and contact details of the chemical supplier/manufacturer of the chemical product

Answer 28

supplier identification

Question 29

these are the universal chemical hazard symbols associated with a chemical as per GHS standard

Answer 29

hazard symbols/pictogram

Question 30

a technical sheet that gives a concise yet comprehensive safety information on chemical product or its mixtures

Answer 30

safety data sheet

Question 31

has a total of 16 sections

Answer 31

GHS-compliant SDS

Question 32

require the availability of SDS for all chemical used in the workplace including academic laboratories

Answer 32

Occupational Safety and Health (OSH) standards

Question 33

used as a household toilet cleaner is concentrated hydrochloric acid (HCl) although in laboratory grade

Answer 33

muriatic acid

Question 34

when used with HCl generates toxic chlorine gas

Answer 34

bleach

Question 35

equipment worn to minimize exposure to any workplace hazard, when working with chemicals

Answer 35

personal protective equipment (PPE)

Question 36

example of PPE

Answer 36

laboratory gown goggles gloves closed shoes face mask

Question 37

proper ventilation and laboratory safety equipment are essential when working with chemicals

Answer 37

engineering controls

Question 38

standard features in a chemical laboratory to prevent its contamination with chemical fumes

Answer 38

fume hood and exhaust fans

Question 39

include metals, minerals and non-metals

Answer 39

inorganic chemicals

Question 40

carbon-containing chemicals

Answer 40

organic chemicals

Question 41

based on these, each chemical group was subdivided into compatible chemical family

Answer 41

reactivity

Question 42

within this, the various chemicals may then be arranged alphabetically for easier identification and self-designed systematic codes may also be incorporated for more efficient inventory purpose

Answer 42

compatible family

Question 43

some chemicals require specific storage

Answer 43

corrosive and flammable chemicals

Question 44

inorganic acids and some organic acids that are best kept in a corrosive/acid cabinet which is made up of wood with acid-resistant epoxy coating or dense plastic material

Answer 44

corrosive chemicals

Question 45

never store corrosive chemicals in these as it is prone to corrosion by the acids

Answer 45

metal cabinets

Question 46

examples include alcohol, ethers, ketones, and hydrocarbons

Answer 46

flammable chemicals

Question 47

material of cabinets where flammable chemicals can be stored,

Answer 47

dense steel

Question 48

used to evaluate a chemical reactio

Answer 48

balanced chemical equation

Question 49

Shows the reactants and products

Answer 49

balanced chemical equation

Question 50

Gives the number of moles of each substances used and produced

Answer 50

balanced chemical equation

Question 51

the maximum amount of the product formed from a given amount of the reactants based on the balanced chemical equation

Answer 51

theoretical yield

Question 52

the amount of product that is finally obtained after carrying out a reaction

Answer 52

actual yield

Question 53

computed with the ratio of the actual yield to the theoretical yield multiplied by 100

Answer 53

percent yield

Question 54

percent yield formula

Answer 54

actual yield / theoretical yield x 100

Question 55

reaction that allowed for the recovery of copper whose mass will be determined to calculate for the % yield

Answer 55

CuSO4 (aq) + Zn (s) -> Cu (S) + ZnSO4 (aq) Cupric sulfate + Zinc -> Copper + Zinc sulfate

Question 56

observation with the addition of HNO3 to copper wire

Answer 56

solution dissolved the copper metal, the color changed into green and produced red fumes

Question 57

observation in addition of distilled water to the reaction mixture

Answer 57

the diluted solution turns into a light blue hue

Question 58

addition of NaOH to the solution

Answer 58

light blue solution turns into a deep blue solution

Question 59

heating the reaction mixture

Answer 59

deep blue solution turns into a black color

Question 60

addition of H2SO4 to the black precipitate

Answer 60

the solution cleared up and turned into blue

Question 61

addition of Zn to reaction mixture

Answer 61

black precipitate dispersed into red solids and likewise dissolved

Question 62

is the temperature at which the liquid and solid phase of the substance exist in equilibrium with each other

Answer 62

freezing point

Question 63

one can determine the freezing point by plotting this

Answer 63

cooling curve

Question 64

solution containing these can lower the freezing point of the solution compared with that of a pure solvent

Answer 64

nonvolatile solute

Question 65

colligative property of a solution that is dependent on the amount of the solute and not on the nature of the solute particles

Answer 65

freezing point depression

Question 66

symbol for freezing point depression

Answer 66

𝛥𝑇𝑓

Question 67

other colligative properties include

Answer 67

boiling point elevation vapor pressure lowering osmotic pressure

Question 68

formula for freezing point depression

Answer 68

𝛥𝑇𝑓 = Kfm

Question 69

Kf means

Answer 69

molal freezing point depression constant that is dependent on the solvent

Question 70

m means

Answer 70

molality of the solution

Question 71

molality of the solution formula

Answer 71

moles of solution / mass in kg solvent

Question 72

technique that is used to experiment and acquire information about a solution containing an acid or base

Answer 72

acid-base titration

Question 73

an analytical chemistry technique used to find an unknown concentration of an analyte (the titrand) by reacting it with a known volume and concentration of a standard solution (titrant)

Answer 73

acid-base titration

Question 74

analyte

Answer 74

titrand

Question 75

standard solution

Answer 75

titrant

Question 76

typically used for acid-base reactions and redox reactions, help determine their acidic or basic properties

Answer 76

titrations

Question 77

decides the endpoint in Titration

Answer 77

indicator

Question 78

used to calculate the amount of a known acidic or basic substance through acid-base reactions

Answer 78

acid-base titration

Question 79

latin word where Titration come from which means an inscription or title

Answer 79

titulus

Question 80

implies the determination of the concentration or rank of a solution with respect to water with a pH of 7

Answer 80

titration

Question 81

added from an apparatus known as the burette

Answer 81

standard solution

Question 82

the process of adding a standard solution until the reaction is complete

Answer 82

titration

Question 83

specific conditions that reactions can be considered as titrations

Answer 83

Reaction has to be fast Change in free energy during the reaction must be large enough for the spontaneity of the reaction There must be always a way to decide the completion of the reaction

Question 84

stage that shows the completion of reaction

Answer 84

endpoint

Question 85

Detected by a physical change that is produced by the solution itself or by the addition of a reagent known as an indicator

Answer 85

endpoint

Question 86

stage where the amount of reagent added is exactly equivalent to the amount of reacting substance in the titrated solution

Answer 86

equivalent point

Question 87

At the equivalence point in an acid-base titration (neutralization), the moles of the acid are what to the moles of the base

Answer 87

equal

Question 88

show the relation between the moles of the acid and volume of the acid to the moles of the base to the volume of the base

Answer 88

MacidVacid = MbaseVbase

Question 89

typically detected only after the addition of a slight excess amount of titrant

Answer 89

endpoint

Question 90

amounts to an error to the experiment

Answer 90

difference between endpoint and equivalent point

Question 91

is when a solution of unknown strength adds to a specific volume of a treated sample containing an indicator

Answer 91

titration

Question 92

the main active ingredient in vinegar, a common household product that is used for cooking and even for cleaning

Answer 92

acetic acid

Question 93

percentage of acetic acid in commercially available vinegar

Answer 93

4-7 percent

Question 94

used as a titrant to react with the acetic acid in vinegar based on the reaction:

Answer 94

NaOH

Question 95

reaction between acetic acid and sodium hydroxide

Answer 95

HC2H3O2 + NaOH -> NaC2H3O2 + H2O

Question 96

type of reaction which takes place in the presences of phenolphthalein

Answer 96

neutralization

Question 97

completion of reaction can be monitored by the change in color of the phenolphthalein

Answer 97

light pink

Question 98

m/v percent formula

Answer 98

g of mass / vol of solution x 100