Testing Strategies

Which of the following strategies is most effective for testing the pH level of a solution?

• Using litmus paper

• Using a pH meter

• Using a thermometer

• Using a barometer

What is the primary purpose of a control group in a scientific experiment?

• To provide a standard for comparison

• To increase the sample size

• To ensure the experiment is ethical

• To test multiple variables at once

Which of the following is a common strategy for testing the presence of starch in a food sample?

• Benedict's test

• Iodine test

• Biuret test

• Sudan III test

In a scientific experiment, what is the term for the variable that is changed or controlled?

• Dependent variable

• Independent variable

• Controlled variable

• Extraneous variable

Tags

NGSS.MS-PS2-2

Which strategy is used to test the effect of temperature on enzyme activity?

• Varying the pH levels

• Changing the substrate concentration

• Altering the temperature

• Modifying the enzyme concentration

What is the best strategy to test the conductivity of a solution?

• Using a voltmeter

• Using a conductivity meter

• Using a thermometer

• Using a barometer

Which of the following is a strategy to test the hardness of a mineral?

• Streak test

• Scratch test

• Flame test

• Benedict's test

What is the most effective strategy for testing the boiling point of a liquid?

• Using a barometer

• Using a thermometer

• Using a pH meter

• Using a voltmeter

Tags

NGSS.MS-PS3-4

Which strategy is used to test the presence of carbon dioxide gas?

• Limewater test

• Benedict's test

• Iodine test

• Biuret test

What is the primary strategy for testing the purity of a substance?

• Melting point determination

• Color change observation

• Odor analysis

• Sound analysis