whmis unit 1 + lab safety

Question 1

what is science

Answer 1

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.

Question 2

problem / question

Answer 2

a statement, usually a question that describes the context and goal of the experiment. do not use “ think “ in questions.

Question 3

hypothesis

Answer 3

the predicted results based on prior knowledge or theory. may involve background research.

Question 4

independent variable

Answer 4

the variable that you reference/ manipulate. also called the manipulated variable

Question 5

dependent variable

Answer 5

the variable that changes in response to the m.v. aka the responding variable

Question 6

controlled variable

Answer 6

the variable you keep fixed and do not change. all variables except for the independent and dependent variable should be controlled.

Question 7

procedure

Answer 7

detailed and numbered list of steps to carry out experiment

Question 8

qualitative data

Answer 8

observed data about the properties of the experiment. not measured in numbers. think colours and shapes

Question 9

quantitative data

Answer 9

the measure data with values. usually your independent or dependent variable. recorded with a graph.

Question 10

analysis

Answer 10

detailed examination of elements or structure of something.

Question 11

purpose of WHMIS

Answer 11

to provide information for the safe use of hazardous materials.

Question 12

what does msds stand for ?

Answer 12

material safety data sheet

Question 13

who has the responsibility of making an msds

Answer 13

the chemical manufacturer , distributer or importer.

Question 14

what information is included in an msds

Answer 14

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.

Question 15

compressed gas symbol+ examples+ precautions.+ class

Answer 15

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.

Question 16

flame symbol (class, meaning, precautions, examples)

Answer 16

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.

Question 17

skull and cross symbol ( class. definition, precautions, examples)

Answer 17

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.

Question 18

oxidizing symbol. ( class, definition, precautions. examples ).

Answer 18

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

Question 19

t shaped exlamation mark symbol ( class, definition, precautions + examples).

Answer 19

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.

Question 20

biohazard symbol ( class, definition, precautions, examples).

Answer 20

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.

Question 21

corrosive symbol ( class, definition, precautions , examples)

Answer 21

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.