# taks_obj_1_ntk

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```					   Science Measurement
SI units, adapted from the metric
system, are used in science

Base units are:
Meter – length
Liter – volume
Gram - mass
Science TAKS Need to Know   1
Types of Graphs - LINE
Different types of graphs are used to show
different relationships between data
Line graphs – show continuous change
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Science TAKS Need to Know    2
Types of Graphs - BAR
Different types of graphs are used to show
different relationships between data
Bar graphs – compare two measured
variables (show differences)

Science TAKS Need to Know    3
Types of Graphs- PIE
Different types of graphs are used to show
different relationships between data
Pie graphs – show percentages

Science TAKS Need to Know    4
Democritus named the atom
2,500  years ago, the Greek
philosopher Democritus,
decided that matter was
units called “atoms”.
8.3E

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Spring Scale
Measure WEIGHT in Newtons

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Both measure volume in mL, but the

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Meniscus
"A characteristic of liquids
in glass containers is that
they curve at the edges.
This curvature is called
the meniscus. You
measure the level at the
horizontal center or
inside part of the
meniscus. With water in
glass, the meniscus will
curve up at the edges and
down in the center.
of the meniscus."

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Triple Beam Balance
Measures MASS in GRAMS

Always carry this with 2 hands!

Science TAKS Need to Know   9
Microscope
   Calculate total magnification by
multiplying the power of the eye lens X
the power of the objective lens

Science TAKS Need to Know   10
Goggles
   Protective plastic goggles are worn during
experiments to keep your eyes safe.

Science TAKS Need to Know   11
Telescope
Used to view far away objects, like stars and
planets.
Contains lenses or mirrors to magnify
distant objects.

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Test Tube
A glass tube used to hold or heat
substances. Never point the open end of
a test tube at anyone!

Science TAKS Need to Know   13
Hot plate
   An electrical plate used to heat substances
in a lab investigation. Always protect
yourself!

Science TAKS Need to Know   14
Meter Stick
   A ruler marked in millimeters, centimeters
& meters used to measure length.

Science TAKS Need to Know     15
Petri Dish
A round, flat dish with a cover that is used
to grow microorganisms in the lab.

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Thermometer

    Measures
temperature in
degrees Celsius
(oC)

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Independent Variable
The MANIPULATED or CHANGED factor in
an experiment. This is the variable
controlled by the person doing the
experiment.

Ex: You may change the amount of water
you give a plant or the amount of fertilizer
applied to soil.

Science TAKS Need to Know   18
Dependent Variable
The outcome or RESULT of manipulating or
changing the independent variable.

What happens to the dependent variable is
the EFFECT of what the experimenter
does to the independent variable

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Inferences
Conclusions that go beyond the facts

Science TAKS Need to Know   20
Promotional Claim
A statement used to sell a product or
service. Can sometimes be misleading, so
you need to understand basic science
facts to be able to evaluate how valid the
information is.

Science TAKS Need to Know   21
Valid conclusion
Valid results are those that are well-
supported by evidence. When scientific
findings are evaluated, a scientist looks for
reliable and accuracy. Multiple trials, or
sets of data, give us more reliable and
valid information.

VALID results are REPRODUCIBLE – they
can be recreated by other scientists.

Science TAKS Need to Know   22
Models
A diagram or an object that represents
something else & demonstrates how it
works.
Models aren’t exactly the same as what
they represent so they have limitations
and can always be improved.

1.   How closely does it resemble what it
represents?
2.   What does the model show?
3.   How might the model be improved?

Science TAKS Need to Know   23

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 views: 3 posted: 11/7/2011 language: English pages: 23