whmis unit 1 + lab safety Flashcards
what is science
science is a way to acquire knowledge through observation and experimentation to understand the natural world. scientific theories are based upon analysis of evidence from the experiments. scientific knowledge is subject to change and build upon.
problem / question
a statement, usually a question that describes the context and goal of the experiment. do not use “ think “ in questions.
hypothesis
the predicted results based on prior knowledge or theory. may involve background research.
independent variable
the variable that you reference/ manipulate. also called the manipulated variable
dependent variable
the variable that changes in response to the m.v. aka the responding variable
controlled variable
the variable you keep fixed and do not change. all variables except for the independent and dependent variable should be controlled.
procedure
detailed and numbered list of steps to carry out experiment
qualitative data
observed data about the properties of the experiment. not measured in numbers. think colours and shapes
quantitative data
the measure data with values. usually your independent or dependent variable. recorded with a graph.
analysis
detailed examination of elements or structure of something.
purpose of WHMIS
to provide information for the safe use of hazardous materials.
what does msds stand for ?
material safety data sheet
who has the responsibility of making an msds
the chemical manufacturer , distributer or importer.
what information is included in an msds
1) it lists the hazardous ingredients of a product, 2) it lists the physical and chemical characteristics, 3) it lists the possible harms to human health, 4) the chemicals it may adversely react with, 5) handling precautions, 6) types of measures that can be used to control exposure.
compressed gas symbol+ examples+ precautions.+ class
Class A,
definition: any product that is normally gas at room temperature and kept in a container under pressure. if ruptured or broken may torpedo, may explode depending on how it is handled. liquefied compressed gasses may cause severe burns from frostbite.
precautions: keep the container tightly closed, keep away from heat changes, do not abuse.
examples: welding gases, propane, fire extinguishers.
flame symbol (class, meaning, precautions, examples)
class B.
definition: burns easily and may release flammable gas into the air when in contact with water.
precautions: avoid and eliminate ignition sources, and keep the storage area cool and dry.
examples: propane, gasoline.
skull and cross symbol ( class. definition, precautions, examples)
class : D1
definition: the materials are highly poisonous and will cause instant effects.
precautions: do not breath gas or vapors, wear proper protective gear, avoid skin contact, wash hand thoughroughly after using these materials, keep containers tightly closed.
examples: hydrogen sulphide , cyanide, strychnine.
oxidizing symbol. ( class, definition, precautions. examples ).
class: c
definition : oxiders cause substances to burn or continue to burn because they release oxygen. oxdizers do not usually burn on their own. may violently react if it contact flammable substances.
precautions: keep away from heat, store in a cool place, keep away from flammable and combustible materials, avoid shock and friction.
examples: hydrogen, oxygen gas, bleach
t shaped exlamation mark symbol ( class, definition, precautions + examples).
class: d2
definition: materials are toxic but their effects will not immeditely harm you but likely will in some way.
precautions: do not breath gas or vapors, avoid skin contact, wash hands after contact, wear suitable protective gear.
biohazard symbol ( class, definition, precautions, examples).
class: d3
definition: organisms, germs and bacteria, and toxins from organisms that can harm human health.
precautions: keep containers tightly closed, wear suitable protective gear, seek medical attention if you feel ill.
examples: HIV, hepatitis B, salmonella.
corrosive symbol ( class, definition, precautions , examples)
class: E
definition: includes corrosive materials such as acids and bases. these materials can cause permanent burns/ damage to tissue.
precautions: avoid skin contact, use recommended respiratory protective equipment and other personal protective equipment.
examples: caustic soda, sulphuric acid, many cleaners and disinfectents.
