Variables & Control Groups
What is a variable?
A factor that can change in an experiment
What does a bar graph show?
Comparisons between different groups or categories.
Name a tool used to measure volume.
Graduated Cylinder or Beaker
What is a claim?
A statement or conclusion that answers a question.
What is a hypothesis?
A testable prediction (educated guess) about the relationship between variables.
What is a control group?
The group that does not receive the experimental treatment and is used for a baseline of comparison.
How would you represent data that changes over time?
A line graph
How do you use a graduated cylinder correctly?
Find the bottom of the meniscus to read the measurement.
What is evidence?
Data or information that supports your claim.
What is the hypothesis format?
If the IV happens, then the DV will happen this way, because ...
Why are variables important?
They help determine the effect of the independent variable on the dependent variable.
What graph would you use to compare categories?
A bar graph.
Name the SI unit for mass.
What is reasoning?
What is a data table?
A structured format (table) for organizing data during data collection.
What is an independent variable?
The variable that is changed or manipulated.
How do you decide which graph to use?
Based on the type of data you have and what you want to show.
Why do you need to 'zero' a balance?
To ensure the mass is correct and not counting anything other than the object.
When do scientists use CER?
In conclusions in experiments, to make sense of data.
What is a graph?
A graph is a visual display of the data that was collected during an experiment.
Why are control variables important?
To ensure results are due to the independent variable and not other factors.
Explain how to interpret data from a graph.
Look at the axes, identify trends, and analyze the data points.
What tool do you use to measure temperature? What is the SI unit for temperature?
Thermometer; kelvins (K)
Write a reasoning statement for the claim: Plants grow taller with more sunlight.
Because plants use sunlight as food in photosynthesis, if they have more sunlight, they will have more food and be able to grow more.
What is the first thing you should do if something unsafe has happened during your experiment?
INFORM YOUR TEACHER !!!!!