unit 1: hazard symbols, errors, accuracy and precision, bunsen burner Flashcards
explosive (please state a desc. of the symbol, what it means and precautions to have)
a exploding ball..
- unstable explosive
- mass explosion hazard
- severe projection hazard
- fire/projection/blast hazard
- may mass explode in fire
- keep away from heat sources
flammable (please state a desc. of the symbol, what it means and precautions to have)
fire with a line at the bottom
- produces fire/ poisonous stuff when in contact with high heat
- keep away from open/naked flame
irritant (please state a desc. of the symbol, what it means and precautions to have)
exclamation mark
- mainly applies to alchohol
- causes irritation to eyes, skin, nose
- may cause respiratory irritation/drowsiness/dizziness/allergic skin reaction
- harmful if inhaled/swallowed/in contact with skin
- harms health/ environment
- take extra care when handling and ensure area is well-ventilated when using
toxic (please state a desc. of the symbol, what it means and precautions to have)
a skull 💀
- causes much health damage when in contact with anything living
- might be fatal
- use gloves and take extra care when handling
aspiration/carcunigenicity hazard (please state a desc. of the symbol, what it means and precautions to have)
a shape of a guy with a exploding thing at his chest
- may be fatal if swallowed entered airways
- harmful to organs/fertility/unborn child
- may cause cancer/genetic defects/allergy/asthma/breathing difficulties
- wear protective equipments
oxidising (please state a desc. of the symbol, what it means and precautions to have)
a line at the bottom then a circle on the line then fire on the circle
- releases much oxygen when in contact with fire
- keep away from bunsen burner
- may cause fire/explosion/intensify fire
- keep away from other chemicals
biohazard (please state a desc. of the symbol, what it means and precautions to have)
like the three circle shape
- normally applicable for blood
- contains diseases
gas under pressure (please state a desc. of the symbol, what it means and precautions to have)
a dynamite stick??
- store it in pressurized cylinders
- explodes on heating
- may cause oxygen leak when in enclosed spaces
-may cause cryogenic burns/injury
- keep away from heat
corrosive (please state a desc. of the symbol, what it means and precautions to have)
two test tubes with liquid pouring out of both of them: one on a hand one on an item
- normally applies to acids
- causes sever damage when in contact with body parts
- use gloves and take extra care when handling
environmental toxicity (please state a desc. of the symbol, what it means and precautions to have)
a dead tree and a dead fish
- cause potential harm to the environment
- usually found in pesticides / biocides / petrol / turpentine etc.
- dispose through suitable methods
independent variable
variable changed
dependent variable
the variable measured
controlled variable(s)
the variable(s) kept constant
zero error
- a type of systematic error
- consistent error - zero error occurs when the starting mass shown in the scale is not 0, thus the mass measured would be more/lesser than the actual mass
parallax error
- unpredictable error
- reader does not look at the measurement from eye level/ bottom of the meniscus
