Scientific endeavour Flashcards

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1
Q

Hypothesis

A

Statement of a prediction; written before a experiment

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2
Q

Independent Variable

A

changed variable

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3
Q

Dependent variable

A

Measured variable

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4
Q

Controlled variable

A

Constant variable

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5
Q

Bunsen Burner

A

Heat substances

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6
Q

Tripod stand

A

A support for the substance places one top of the Bunsen burner flame

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7
Q

Test tube (smaller than a boiling tube)

A

Small amount of substances for heating or mixing

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8
Q

Measuring tube

A

Measures volumes of liquids; various capacities; precision of 0.5ml

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9
Q

Boiling tube

A

(Bigger than test tube) simple reactions can be carried out involving heating

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10
Q

Burette

A

For dispensing substances in PRECISE volumes

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11
Q

Gas jar

A

Contains gases smallest division up to 0.10 m3 (measures up to hundredths)

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12
Q

Pipette

A

Measures accurately fixed volumes of liquids; various capacities, to precision

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13
Q

Precautions to be taken when doing measurements

A
  1. Eye level should be positioned vertically (90 degrees), when reading measurement
  2. To avoid parallax error which is the error in reading due to incorrect positioning of eyes
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14
Q

Steps with using a vernier caliper

A
  1. Place the object between the jaws firmly
  2. Read the main scale + the zero mark one the vernier scale
  3. Read the vernier scale
  4. Add the main scale and the vernier scale (find diameter)
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15
Q

Measuring volume: measuring cylinder

A

Precision of 0.5cm3 or 0.5m

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16
Q

measuring volume: Beaker

A

Not precise for measuring volume

17
Q

Measuring volume: Syringe

A

Has a meniscus

18
Q

Measuring volume: Pipette

A

Draws liquid up: Measures up specific volumes
Let liquid flow out: measures amount dispersed (0.10ml)