Scientific Method
What is the first step of the scientific method process?
Identify Problem / Ask Question
The variable that the scientist deliberately changes is the:
Independent Variable
What is the best format for a hypothesis?
If _____, then _____ because ______
Lisa timed how fast apple slices turned brown after being dipped in different preservatives such as lemon juice, fruit freshener, and lime soda. What is the independent variable?
Type of preservative.
A student tests whether different amounts of fertilizer affect plant height. The amount of fertilizer is this type of variable.
Independent variable
Why are controls used in experiments?
To provide a standard for comparison.
The variable that is measured or observed as a result of a change is that:
Dependent Variable
Which action (s) is part of the scientific method?
1. Making Observations and Asking a Question
2. Changing several variables at once.
3. Ignoring unexpected data.
4. Repeating the experiment
1. Making Observations and Asking a Question
4. Repeating the Experiment
Lisa timed how fast apple slices turned brown after being dipped in different preservatives such as lemon juice, fruit freshener, and lime soda. What is the dependent variable?
Time is takes the apple slices to turn brown
Control
Why do scientists repeat experiments?
To improve the reliability of the results.
Elizabeth tested how high five brands of tennis balls bounced when dropped from 2 meters onto the same floor tile. What is the independent variable?
Brand of tennis ball
A factor that can change in an experiment is called a :
variable
A hypothesis states: "If liquids are placed in containers with sides of differing heights, then they will evaporated faster in the container with lower sides."
What is the independent variable?
Height of the container sides
What are factors in an experiment that can change?
variable
The standard used for comparison is an experiment is called the
control or control group
Elizabeth tested hoqw high five brands of new tennis balls bounced when dropped from 2 meters onto the same floor tile. What is the dependent variable?
Michael placed 100 red, 100 brown, and 100 yellow seeds in a bird feeder and counted how many of each color remained after two days. What is the independent variable?
Color of the seeds
A hypothesis states: "If liquids are placed in containers with sides of differing heights, then they will evaporated faster in the container with lower sides."
What is the dependent variable?
The rate of evaporation
Why do scientists repeat experiments?
To make sure the results are reliable and reproducable.
A factor that is kept the same throughout an experiment is called
constant
Maria placed equal amounts of bread and water in clear plastic wrap and repeated setup using red and blue plastic wrap. She measured how long the bread took to mold. What is the independent variable?
Color of plastic wrap
Michael placed 100 red, 100 brown, and 100 yellow seeds in a bird feeder and counted how many of each color remained after two days. What is the dependent variable?
Number of seeds remaining after two days.
A student hypothesizes that warmer water will dissolve sugar faster. Identify the independent variable and dependent variable.
Independent variable: temperature of water
Dependent variable: rate of sugar dissolving
After forming a hypothesis, a scientist performs this step to test whether the prediction is supported.
Experiment