Lab Safety
You should always do this before you act?
Think
Ask your teacher if it's o.k.
Ask yourself "Is this safe?"
Read the directions
In a compound microscope, what is the name of the lens nearest your eye when you look through the microscope?
eyepiece or ocular lens
Step 1 of the scientific method is to
state the p _ _ _ _ _ _.
State the problem
Step 1 of the experimental design is to state the p _ _ _ _ _ _.
State the problem
Variables that never change are called the
c _ _ _ _ _ _ _ ed variables
Controlled variables
example: both the experimental group of plants and the control group of plants are all the same height with the same history of care (water, sunlight, type of soil), same variety, etc...
Lab Safety is a careful process with the goal to prevent I_ _ _ _ y
Injury
In a compound microscope, what is the name of the lens closest to the specimen?
objective lens
When you make a prediction about the possible answer to the problem, you are proposing a
h _ _ _ _ _ _ _ _ _
hypothesis
Step 2 of the experimental design is to choose the v _ _ _ _ _ _ _ s you will measure
Choose the variables
The variables that you change in an experiment, which means you do one thing to the experimental group (e.g., giving them water or keeping them in the dark) that you don't do the the control group (kept in their normal, natural state) is called?
Independent Variable
What equipment do you wear over your eyes for protection in a lab?
safety goggles
In a compound microscope the flat surface where you place a slide containing a specimen is called a st _ _ _.
stage
After you propose a hypothesis you must then test the hypothesis by designing an
e _ _ _ _ _ _ _ _ _
experiment
Step 3 of the experimental design is to choose the c _ _ _ _ _ _ group. This is a group that you do nothing to which remains in its natural state. It is important to make sure the experimental group and the control group are the s _ _ _ before you start the experiment.
Choose the control group
The experimental group (the one you manipulate) and the control group must be the same before you start the experiment (e.g., plants of the same variety, size, shape, health, same soil, same history of light and water) so you can compare later.
The variable that responds to the independent variable and you will measure for changes and use to compare the experimental group to the control group is called?
Dependent variable
What 3 things do you protect your eyes from being exposed to when you wear safety goggles?
1. ch _ _ _ _ _ _ s
2. preserved spe_ _ _ _ _ s
3. dis _ _ _ _ _ _ _ of specimens
1. using chemicals
2. looking at preserved specimens
3. during dissection of specimens
This piece of equipment has as a wide top and a narrow bottom and is when pouring liquids to make it easier and neater?
Funnel
When designing a controlled experiment you must repeat it more than once with a large sample size and collect data. A controlled experiment tests only o _ _ factor called a
v _ _ _ _ _ _
test only one factor called a variable
Your hypothesis must be written as an
i _ / t _ _ _ statement (e.g., I _ a group of plants is given water and another group of plants is not, t _ _ _ the group that is watered will grow taller than the plant group that was not watered).
if/then statement
(e.g., If a group of plants is given water and another group of plants is not, then the group that is watered will grow taller than the plant group that was not watered).
This group is used for comparison and typically kept in natural conditions is called?
The control group
Never heat a cl _ _ _ _ container. It may explode.
closed
This tool is used to measure volume?
gr _ _ _ _ _ _ _ cy _ _ _ _ _ _
Graduated Cylinder
You must make ob _ _ _ _ _ _ _ _ _ s which involves collecting d _ _ _ . You must record your data in an org _ _ _ _ _ _ manner using:
t _ _ _ _ s, gra _ _ _, dia _ _ _ _ s, etc...
make observations involves collecting data which you record in an organized manner using:
tables, graphs, diagrams, etc...
The dependent variable is the one you will be measuring to see if what you did (independent variable) had any impact on the experimental group. You must measure the dependent variable in both the c_ _ _ _ _ _ group and the experimental group.
control
The group where a variable is being changed by the experimenter to test different outcomes is called?
Experimental Group