Becoming a scientist / Introduction to Science Flashcards

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1
Q

apparatus

A

specialised equipment needed for a particular purpose.

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2
Q

Bunsen burner

A

a small adjustable gas burner used in laboratories as a source of heat

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3
Q

Celsius

A

a scale of temperature on which water freezes at 0° and boils at 100°.

has the symbol (c)

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4
Q

Controlled Variable

A

all other variables in the experiment which are kept the same (ie controlled) on purpose other than the independant and dependant variable.

pictured: In this case

the size of the soft drink bottle (all the same) is controlled.

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5
Q

Variable

A

is anything that can change or something that can affect the results of an experiment.

Pictured: are all variables

  • the different types of soft drinks
  • the amount of menthos used
  • the temperature of the soft drink
  • The volume of soft drink
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6
Q

Independant variable

A

The factor or variable we c_hange intentionally_ to test how it affects the experiment

Pictured: the types of soft drink are being changed

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7
Q

Dependant variable

A

is the variable that changes as a result of the independant variable. ie the one that is measured.

pictured: the height the soft drink reaches after the menthos has been added.

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8
Q

experimental observations

A

the use of all your senses to record what has happened during an experiment, this includes sight, hearing, taste, smell and touch

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9
Q

Observation can be bothe qualtative or quantative. what is the difference

A

qualtative - use words to describe observations such as colour, sour, hot, cold are all qualtative descriptions.

quantative - use measurement or numbers (amounts) 34 m or 25 degress are quantative observations.

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10
Q

what are units

A

measurements are usually followed by units, metres, seconds, kiolograms are all units

  • distance is measure in metres (m)
  • time is measure in seconds (s)
  • mass is mesaured in kilograms (kg)
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11
Q

meniscus

A

when measuring take your reading from the bottom of the meniscus

The shape liquid makes in a measuring cylinder.

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12
Q

parallax error

A

When measuring, looking from the side or above can produce errors and are called parallax errors

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13
Q

Scientific Diagram

A

cuttingtheequipmentinhalf

Simple diagrams that show scientific equipment.

-use a pencil and a ruler
- label equipment
- dont have floating equipment

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14
Q

Name the following Scientific equipment

A

* Bunsen burner

* Retort Stand

* evaporating basin

* Test tube

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15
Q

When drawing graphs

A
  • label each axis with a heading and units
  • include a heading with your graph
  • make sure both axis scales are linear
  • use x’s to mark the points
  • use a ruler to join the X’s
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16
Q

What is an inference?

A

An inference isa conclusion or educated guess drawn from observations as well as previous knowledge.

17
Q

What is the Si unit for volume

A

Litres

18
Q
  1. how do you calculate the voulme of a regular object including units
  2. What would the units of volume be in this case.
A
  1. 5 x 2 x 3 = 30 cm^3

(cm cubed)

19
Q

What are the SI units for the following
1. volume
2. Distance
3. Mass
4. Time

SI uni is standard internation unit

A
  1. litres (l)
  2. metres (m)
  3. kilograms (kg)
  4. second (s)
20
Q

What is the formula for density?

A

Density= m/v

where
m= mass
v= volume

21
Q

How do you measure volume by the displacement method

Good for irregular objects

A
22
Q

Calculate the density of an object that has a volume of 12cm^3 and a mass of 60g

(cm^3) means (cm) cubed

A

D =m/v
=60/12
=5g/cm^3

(60/12) is 60 divided by 12

(cm^3) means (cm) cubed