the scientific endeavour Flashcards
(31 cards)
what is qualitative data?
using 5 senses to make observations
what is quantitative data?
measuring using numerical quantities
what is a hypothesis?
a proposed explanation for an observation
what are the three types of variables?
the independent variable, dependent variable, and control
what is an independent variable?
the variable changed in an experiment
what is a dependent variable?
the variable observed or measured
what is a control
the variable that is being kept constant
the SI unit for volume?
m^3
the SI unit for mass?
kg
the SI unit for time?
s
the SI unit for length?
m
the SI unit for temperature?
K
what is zero error?
an instrument gives a non-zero reading when the measured quantity should be zero
how to remove zero-error?
some instruments have the “tare” function that can reset the scale
what is parallax error?
when the marking on the instrument is viewed form the wrong angle
how do you properly read a ruler?
line of sight it perpendicular to the marking on the ruler
how do you properly read a measuring cylinder?
line of sight is level with the bottom of the meniscus (curved surface of the liquid)
how do you properly read a spring balance?
line of sight is perpendicular to the marking on the scale
how do you properly read a thermometer?
line of sight is level with the top of the meniscus
describe the corrosive symbol
chemicals being poured onto a hand and another material
what does corrosives do?
cause severe damage on contact with body parts
describe the irritant symbol
an exclamation mark
what does irritants do
lead to irritation, allergic reactions or inflammation of the skin, eyes, nose or respiratory system. may cause drowsiness and dizziness. has harmful health effects. can cause harm to ozone layer.
describe the environmental toxicity symbol
dying tree and fish
