Identifying Variables

Juan wanted to find out whether the concentration of salt in water affected how long it takes water to cool. He put 4 identical plastic glasses, each of which contained 225 mL of a different concentration of salt solution, into a freezer. The different salt concentrations were 0 percent, 10 percent, 20 percent, and 30 percent. He recorded the amount of time it took for each solution to cool to a temperature of 3 degrees Celsius.

What is the independent variable?

• Volume of liquid in glasses

• Concentration of salt solution

• Amount of time in the freezer for solution to cool to 3 degrees Celsius

• Degrees Celsius that the solution cooled

Tags

NGSS.MS-PS3-4

Juan wanted to find out whether the concentration of salt in water affected how long it takes water to cool. He put 4 identical plastic glasses, each of which contained 225 mL of a different concentration of salt solution, into a freezer. The different salt concentrations were 0 percent, 10 percent, 20 percent, and 30 percent. He recorded the amount of time it took for each solution to cool to a temperature of 3 degrees Celsius.

What is the dependent variable?

• Volume of liquid in glasses

• Concentration of salt solution

• Amount of time in the freezer for solution to cool to 3 degrees Celsius

• Degrees Celsius that the solution cooled

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Juan wanted to find out whether the concentration of salt in water affected how long it takes water to cool. He put 4 identical plastic glasses, each of which contained 225 mL of a different concentration of salt solution, into a freezer. The different salt concentrations were 0 percent, 10 percent, 20 percent, and 30 percent. He recorded the amount of time it took for each solution to cool to a temperature of 3 degrees Celsius.

What are the constants? (can be more than one)

• Glasses

• Volume of salt solution

• Freezer

• Concentration of salt solution

• Amount of time in freezer for solution to cool to 3 degrees Celsius

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Juan wanted to find out whether the concentration of salt in water affected how long it takes water to cool. He put 4 identical plastic glasses, each of which contained 225 mL of a different concentration of salt solution, into a freezer. The different salt concentrations were 0 percent, 10 percent, 20 percent, and 30 percent. He recorded the amount of time it took for each solution to cool to a temperature of 3 degrees Celsius.

Which glass is the control group?

• 0 percent

• 10 percent

• 20 percent

• 30 percent

Juan wanted to find out whether the concentration of salt in water affected how long it takes water to cool. He put 4 identical plastic glasses, each of which contained 225 mL of a different concentration of salt solution, into a freezer. The different salt concentrations were 0 percent, 10 percent, 20 percent, and 30 percent. He recorded the amount of time it took for each solution to cool to a temperature of 3 degrees Celsius.

Which glass(es) is the experimental group(s)?

• 0 percent

• 10 percent

• 20 percent

• 30 percent

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Susan wanted to know how the amount of water affected the rate of seed germination. She read that 150 mL of water was the ideal amount of water for seed germination of up to 10 seeds in 500g of soil. She got 5 identical flower pots and placed 500g of potting soil in each. She then planted 10 seeds of the same type in each pot. She placed the pots in the same location so that each received the same amount of light. The pots were given the following amounts of distilled water each day for 40 days:

Pot 1 50 mL

Pot 2 100 mL

Pot 3 150 mL

Pot 4 200 mL

Pot 5 250 mL

Each day she recorded the number of seeds that germinated and the height of each plant.

What is the independent variable?

• Amount of water

• Rate of seed germination

• Number of days to germination

• Location of pots

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

Susan wanted to know how the amount of water affected the rate of seed germination. She read that 150 mL of water was the ideal amount of water for seed germination of up to 10 seeds in 500g of soil. She got 5 identical flower pots and placed 500g of potting soil in each. She then planted 10 seeds of the same type in each pot. She placed the pots in the same location so that each received the same amount of light. The pots were given the following amounts of distilled water each day for 40 days:

Pot 1 50 mL

Pot 2 100 mL

Pot 3 150 mL

Pot 4 200 mL

Pot 5 250 mL

Each day she recorded the number of seeds that germinated and the height of each plant.

What is the dependent variable?

• Amount of water

• Rate of seed germination

• Number of days to germination

• Location of pots

Tags

NGSS.MS-LS2-1

Susan wanted to know how the amount of water affected the rate of seed germination. She read that 150 mL of water was the ideal amount of water for seed germination of up to 10 seeds in 500g of soil. She got 5 identical flower pots and placed 500g of potting soil in each. She then planted 10 seeds of the same type in each pot. She placed the pots in the same location so that each received the same amount of light. The pots were given the following amounts of distilled water each day for 40 days:

Pot 1 50 mL

Pot 2 100 mL

Pot 3 150 mL

Pot 4 200 mL

Pot 5 250 mL

Each day she recorded the number of seeds that germinated and the height of each plant.

What are the constants?

• Flower pots

• Amount of water

• Type and number of seeds

• Amount of light

• Amount of soil

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Susan wanted to know how the amount of water affected the rate of seed germination. She read that 150 mL of water was the ideal amount of water for seed germination of up to 10 seeds in 500g of soil. She got 5 identical flower pots and placed 500g of potting soil in each. She then planted 10 seeds of the same type in each pot. She placed the pots in the same location so that each received the same amount of light. The pots were given the following amounts of distilled water each day for 40 days:

Pot 1 50 mL

Pot 2 100 mL

Pot 3 150 mL

Pot 4 200 mL

Pot 5 250 mL

Each day she recorded the number of seeds that germinated and the height of each plant.

What is the control group?

• Pot 1 50 mL

• Pot 2 100 mL

• Pot 3 150 mL

• Pot 4 200 mL

• Pot 5 250 mL

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

Susan wanted to know how the amount of water affected the rate of seed germination. She read that 150 mL of water was the ideal amount of water for seed germination of up to 10 seeds in 500g of soil. She got 5 identical flower pots and placed 500g of potting soil in each. She then planted 10 seeds of the same type in each pot. She placed the pots in the same location so that each received the same amount of light. The pots were given the following amounts of distilled water each day for 40 days:

Pot 1 50 mL

Pot 2 100 mL

Pot 3 150 mL

Pot 4 200 mL

Pot 5 250 mL

Each day she recorded the number of seeds that germinated and the height of each plant.

What are the experimental groups?

• Pot 1 50 mL

• Pot 2 100 mL

• Pot 3 150 mL

• Pot 4 200 mL

• Pot 5 250 mL

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1