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LE.Intro to LE Flashcards | StudBud
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LE.Intro to LE
LE.Intro to LE
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1
Why should an experiment be repeated?
To identify the problem
To form a hypothesis
To reduce the chance of error
to change controls
2
A control group helps an experiment because it give the scientist
None of the above
More participants
More work
A group to compare experimental results to
3
A scientist wants to determine if adding fertilizer to plants affect their height. What is the dependent variable?
The scientist
The temperature
Height of the plant
Fertilizer
4
What is a Hypothesis?
A question
Involves series of ordered steps
a tentative explanation for observations or a phenomenon
An answer
5
We want to test the effect of rain on plant growth. Rain is the
control variable
dependent variable
standardized variable
independent variable
6
Chromatography can be used to
separate solutes in a solution
mix together solvents and solutes
separate two solvents
boil away solvents
7
The rounded shape of the florence flask makes it easier to
none of the above
incorporate air into a mixture
evenly heat substances
mix solids and liquids
8
How many cm can be found on this ruler?
150cm
15cm
6cm
22cm
9
A graduated cylinder is used to measure:
volume
mass
weight
10
What does the pipette do?
produces a controlled flame
transport a measured volume of liquid
measures liquids in mL
hold test tubes
11
What is water displacement?
a way to measure the volume of a regular object
a way to measure the length of an irregular object
a way to measure the mass of an irregular object
a way to measure the volume of an irregular object
12
CONTROL GROUP in an experiment is the group that
Doesn’t participate in the experiment
Is being tested
Receives independent variable
Does not receive independent variable, STAYS THE SAME
13
What is the variable that the scientist will test in an experiment?
Dependent Variable
Independent Variable
Control Variable
Hypothesis
14
Chromatography is
The mixing of colours to form photographs
The bonding of colour to a surface, for example on a smartie
A process used to separate chrome from a mineral
A technique used to separate chemicals from a mixture
15
The Triple Beam Balance __________ .
measures volume.
measures distance.
measures mass, which is height.
measures mass (the amount of matter)
16
60 mm = ________ cm
6000 cm
6 m
60 cm
6 cm
17
Identify the independent variable in this experiment.
The height of the flower.
Amount of sunlight.
The type of plant.
The type of soil.
18
How many variables are you allowed to test per experiment?
1
2
3
ZERO...it needs to be controlled
19
To make a fair test or experiment you should change __________ variable(s) at a time.
one
four
three
two
20
An ultracentrifuge does what?
It is a type of microscope that allows 3D images to be taken
It determines if a cell is prokaryotic or eukaryotic
It spins mixtures really fast to separate their componenets by density
21
Which graduated cylinder shows 42 mL?
D
A
B
C
22
Factors that should be kept the same between experimental and control groups are known as
tools
manipulatives
constants
variables
23
A scientist wants to determine if adding fertilizer to plants affect their height. What is the independent variable?
The temperature
The scientist
Height of the plant
Fertilizer
