science chpt 1

• The scientific method involves making observations, forming a hypothesis, testing the hypothesis through experimentation, and then drawing a conclusion.
• scientific method ?


  making an observation > hypothesis > prediction > testing prediction
• SI units
• lab apparatus
• how to draw measuring cylinder marking

  equally 5 spaced marking
• testing solutions : precision and accuracy
• what is accuracy

  reading close to the true value
• what is precision

  the closeness between measured values
• zero error

  showing a non-zero value when there is nothing on them
• parallax error

  incorrect use of instrument (viewing marking from wrong angle)
• qualitative data

  involves senses
• quantitative data

  senses and measurement
• communicating in science

  science conferences, journals, newspapers, websites
• hazard symbol

  
• causes fire or explosion due to easy release of oxygen

  oxidising

  
• ignites or catches fire easily

  flammable

  
• hazard symbol

  
• hazard symbol

  
• may cause severe damage to body parts

  corrosive

  
• what do you do when there is a zero error

  tare it when nothing is on it
• causes irritation to eyes, respiratory system and skin

  harmful/irritant

  
• hazard symbol

  
• hazard symbol

  
• explode when heated and oxygen deficiency

  gas under pressure

  
• harmful effects to the body when breathed in, swallowed or in contact with skin

  acute toxicity

  
• hazard symbol

  
• emits radiation that can kill living cells

  radioactive

  
• fire or explosion on contact with heat

  explosive

  
• hazard symbol

  
• hazard symbol

  
• poisonous substance of a biological nature

  biohazardous

  
• harmful effects on the environment

  environmental toxicity

  
• hazard symbol

  
• breathing difficulties, birth defects, cancer

  aspiration hazard

  
• what colour is a luminous flame

  yellow and blue flame
• what colour is a non-luminous flame

  pale and dark blue
• luminous flame is steady

  false
• non-luminous flame is steady

  true
• which is hotter ; luminous or non-luminous

  non-luminous
• how should the airhole be to make a luminous flame


  air hole closed