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Created with Snap Created with Snap Created with Snap

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.              

Created with Snap Created with Snap Created with Snap


Created with Snap Created with Snap Created with Snap

Look again at 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


What data are being collected and recorded in the table?        

Created with Snap Created with Snap Created with Snap

Look again at 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 variables are held constant in this experiment? Select all that apply.

Hint: Variables that are held constant are kept the same.            

Created with Snap Created with Snap Created with Snap

Look again at the experimental protocol. Then complete 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


Complete the following statement.

In this experiment, the temperature of the water is variable. 

The time it takes the food coloring to spread evenly throughout the water is variable.                     

Created with Snap Created with Snap Created with Snap

Look again at 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 question can this experiment answer?                  

Created with Snap Created with Snap Created with Snap

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:

    1 narrow glass container

    1 wide glass container

    warm water (30°C)

    red food coloring

    2 stopwatches

  • Procedure:

    1. Pour 100 milliliters of warm water in the narrow container.

    2. Pour 100 milliliters of warm water in the wide container.

    3. Put two drops of food coloring into each container.

    4. Measure how long it takes the food coloring to spread evenly throughout the water in each container.

    5. Record the times in the data table.

    6. Clean the containers.

    7. Repeat steps 1 through 6 two more times.

  • Data table:

    Diffusion time in secondsTrial 1Trial 2Trial 3
    narrow container


    wide container


Which materials are required for this experiment? Select all that apply.           

Created with Snap Created with Snap Created with Snap

Look again at the experimental protocol. Then complete the question below.

  • Materials:

    1 narrow glass container

    1 wide glass container

    warm water (30°C)

    red food coloring

    2 stopwatches

  • Procedure:

    1. Pour 100 milliliters of warm water in the narrow container.

    2. Pour 100 milliliters of warm water in the wide container.

    3. Put two drops of food coloring into each container.

    4. Measure how long it takes the food coloring to spread evenly throughout the water in each container.

    5. Record the times in the data table.

    6. Clean the containers.

    7. Repeat steps 1 through 6 two more times.

  • Data table:

    Diffusion time in secondsTrial 1Trial 2Trial 3
    narrow container


    wide container


Complete the following statement.

Each time you repeat steps 1 through 6, you are performing a different.      

Created with Snap Created with Snap Created with Snap

Look again at the experimental protocol. Then answer the question below.

  • Materials:

    1 narrow glass container

    1 wide glass container

    warm water (30°C)

    red food coloring

    2 stopwatches

  • Procedure:

    1. Pour 100 milliliters of warm water in the narrow container.

    2. Pour 100 milliliters of warm water in the wide container.

    3. Put two drops of food coloring into each container.

    4. Measure how long it takes the food coloring to spread evenly throughout the water in each container.

    5. Record the times in the data table.

    6. Clean the containers.

    7. Repeat steps 1 through 6 two more times.

  • Data table:

    Diffusion time in secondsTrial 1Trial 2Trial 3
    narrow container


    wide container


During each trial, which of the following should you do before starting the stopwatch? Select all that apply.                

Created with Snap Created with Snap Created with Snap

Look again at the experimental protocol. Then answer the question below.

  • Materials:

    2 large glass flasks

    9 identical glass beakers

    9 teaspoons of table salt

    1 graduated cylinder

    room temperature tap water

  • Procedure:

    1. Measure and pour 650 milliliters of tap water into each flask. Use the graduated cylinder to measure precisely.

    2. Add 3 teaspoons of salt to one flask and label the flask medium salinity.

    3. Add 6 teaspoons of salt to the other flask and label it high salinity.

    4. Swirl each flask until all the salt is dissolved.

    5. Label three beakers very low salinity. Using the graduated cylinder, measure and pour 200 milliliters of tap water into each of these beakers.

    6. Label three beakers medium salinity. Measure and pour 200 milliliters of the medium salinity solution into each of these beakers.

    7. Label three beakers high salinity. Measure and pour 200 milliliters of the high salinity solution into each of these beakers.

    8. Place all of the beakers next to each other in a warm, sunny area.

    9. After three days, use the graduated cylinder to measure the amount of water remaining in each beaker.

    10. Record your results in the data table.

  • Data table:

    Volume of water (mL) remaining in each beaker after 3 days
    very low salinity


    medium salinity


    high salinity


Why does the data table have three boxes to fill in for each water salinity level?      

Created with Snap Created with Snap Created with Snap

Look again at the experimental protocol. Then answer the question below.

  • Materials:

    2 large glass flasks

    9 identical glass beakers

    9 teaspoons of table salt

    1 graduated cylinder

    room temperature tap water

  • Procedure:

    1. Measure and pour 650 milliliters of tap water into each flask. Use the graduated cylinder to measure precisely.

    2. Add 3 teaspoons of salt to one flask and label the flask medium salinity.

    3. Add 6 teaspoons of salt to the other flask and label it high salinity.

    4. Swirl each flask until all the salt is dissolved.

    5. Label three beakers very low salinity. Using the graduated cylinder, measure and pour 200 milliliters of tap water into each of these beakers.

    6. Label three beakers medium salinity. Measure and pour 200 milliliters of the medium salinity solution into each of these beakers.

    7. Label three beakers high salinity. Measure and pour 200 milliliters of the high salinity solution into each of these beakers.

    8. Place all of the beakers next to each other in a warm, sunny area.

    9. After three days, use the graduated cylinder to measure the amount of water remaining in each beaker.

    10. Record your results in the data table.

  • Data table:

    Volume of water (mL) remaining in each beaker after 3 days
    very low salinity


    medium salinity


    high salinity


What data are being collected and recorded in the table?         

Created with Snap Created with Snap Created with Snap

Look again at the experimental protocol. Then complete the question below.

  • Materials:

    2 large glass flasks

    9 identical glass beakers

    9 teaspoons of table salt

    1 graduated cylinder

    room temperature tap water

  • Procedure:

    1. Measure and pour 650 milliliters of tap water into each flask. Use the graduated cylinder to measure precisely.

    2. Add 3 teaspoons of salt to one flask and label the flask medium salinity.

    3. Add 6 teaspoons of salt to the other flask and label it high salinity.

    4. Swirl each flask until all the salt is dissolved.

    5. Label three beakers very low salinity. Using the graduated cylinder, measure and pour 200 milliliters of tap water into each of these beakers.

    6. Label three beakers medium salinity. Measure and pour 200 milliliters of the medium salinity solution into each of these beakers.

    7. Label three beakers of high salinity. Measure and pour 200 milliliters of the high salinity solution into each of these beakers.

    8. Place all of the beakers next to each other in a warm, sunny area.

    9. After three days, use the graduated cylinder to measure the amount of water remaining in each beaker.

    10. Record your results in the data table.

  • Data table:

    The volume of water (mL) remaining in each beaker after 3 days
    very low salinity


    medium salinity


    high salinity


Complete the following statement.

In this experiment, the salinity of the water added to each beaker is the      variable. 

The amount of water remaining after three days is the        variable.                             

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