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science sec 1 > chapt 1 : scientific endeavour > Flashcards

chapt 1 : scientific endeavour Flashcards

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1
Q

what is a hypothesis

A

a scientific statement that proposes a possible explanation to some event/phenomenon

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2
Q

what is an independent variable

A

changed variable

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3
Q

what is a dependent variable

A

measured variable

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4
Q

what is a constant variable

A

a variable that is kept constant to ensure a fair experiment

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5
Q

what is a measuring cylinder used for

A

to measure volume of liquids

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6
Q

what is a electronic balance used for

A

to measure mass of solid

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7
Q

what are the instruments to hold liquids

A

beaker and conical flask

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8
Q

what are the steps to light up a bunsen burner

A
  1. close air hole
  2. turn on the gas tap
  3. ignite a burner with light
  4. open air hole
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9
Q

what are the characteristics of a luminous flame

close/open air hole
colour of flame
visibility
suitability for heating
hot/not hot
does/does not give out soot

A

closed air hole
orange flame
high visibility
not suitable for heating
not as hot
gives out soot

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10
Q

what are the characteristic of a non luminous flame

close/open air hole
colour of flame
visibility
suitability for heating
hot/not hot
does/does not give out soot

A

open air hole
blue flame
low visibility
suitable for heating
very hot
does not give out soot

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11
Q

what are the characteristics of a qualitative data

A

involve senses
descriptive

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12
Q

what are the characteristics of a quantitative data

A

involve senses and measurements
numerical

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13
Q

error when nothing is placed on weighing scale but does not show zero

A

zero error

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14
Q

error when marking on an instrument is viewed at a wrong angle

A

parallax error

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14
Q

symbol - causes severe damage when in contact with body parts

A

corrosive

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15
Q

symbol - lead to irritation, allergies

A

harmful/irritant

16
Q

symbol - causes harm to environment

A

environmental toxicity

17
Q

symbol - releases oxygen easily

A

oxidising substance

17
Q

symbol - may explode when heated

A

gases under pressure

18
Q

symbol - causes toxic or harmful effect to body when breathed in, swallowed or in contact with skin

A

acute toxicity

19
Q

symbol - may cause fire or explosion

A

explosives

20
Q

symbol - highly flammable

A

flammable

21
Q

symbol - causes breathing difficulties

A

carcinogenicity

22
Q

what are the parts of a bunsen burner

A

barrel, collar, base, air hole

science sec 1 (8 decks)

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