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    Answer 6 out of 8 questions correctly.

The instructions for how to carry out a science experiment can be found in an experimental
protocol.
An experimental protocol often includes the list of materials you need for the experiment. The protocol also includes the procedure, which is a list of steps for carrying out the experiment. Some experimental protocols include data tables for recording the results of the experiment.
The experimental protocol below is for an experiment testing how quickly food coloring mixes with water. When food coloring is added to water, the particles of food coloring will spread throughout the water in a process called
diffusion.
Read the experimental protocol. Then answer the question below.
  • Materials:
    2 identical glass beakers
    hot water (45°C)
    cold water (5°C)
    blue food coloring
    2 stopwatches
  • Procedure:
    1. Pour 200 milliliters of hot water in one beaker.
    2. Pour 200 milliliters of cold water in the other beaker.
    3. Put three drops of food coloring into each beaker.
    4. Measure how long it takes the food coloring to spread evenly throughout the water in each beaker.
    5. Record the times in the data table.
    6. Clean the beakers.
    7. Repeat steps 1 through 6 two more times.
  • Data table:
    Diffusion time in secondsTrial 1Trial 2Trial 3
    beaker with hot water
    beaker with cold water
Which materials are required for this experiment? Select all that apply.
ref_doc_title.

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Teacher tools
Work it out
Not feeling ready yet? These can help:
Skill IconB.1Identify control and experimental groups
Skill IconB.2Identify independent and dependent variables
Skill IconB.3Identify the experimental question
Skill IconB.4Identify questions that can be investigated with a set of materials