Graphing, Safety, Scientific Method Test Review

A group of students is designing an experiment to determine if the temperature of water affects how well laundry detergent cleans clothing. Which statement best describes a hypothesis for this experiment?

• If more detergent is used, then the water will become colder.

• If more detergent is used, then the clothes will be cleaner.

• If the water is hotter, then the detergent will make the clothes cleaner.

• If the water is hotter, then the detergent will shrink the clothes.

A student performed an experiment designed to test the rate of evaporation of different solutions. He had different beakers containing water mixed with various substances, as well as one with just water. The beaker containing only water is known as the

• control.

• dependent variable.

• independent variable.

• hypothesis.

The pie chart below compares the amounts of energy from different sources used in the United States each year. Which two energy sources together provide more than 50% of the energy needs of the United States?

• nuclear and natural gas

• hydropower and oil

• oil and coal

• natural gas and coal

A student is trying to determine if a certain beetle will help control the population of a harmful plant species. Which sequence of steps would be best suited for this investigation?

• develop a question, conduct an experiment, state a hypothesis, make conclusions, analyze data

• make conclusions, conduct an experiment, develop a question, state a hypothesis, analyze data

• state a hypothesis, make conclusions, develop a question, analyze data, conduct an experiment

• develop a question, state a hypothesis, conduct an experiment, analyze data, make conclusions

What is the final step of the scientific method?

• identifying the problem

• drawing conclusions

• performing an experiment

• forming a hypothesis

The logical and systematic process of solving a problem is known as

• an experiment.

• the conclusion.

• the scientific method.

• a hypothesis.

What is the part of an experiment that does not change, and serves as a basis for comparison?

• control

• hypothesis

• scientific method

• variable

A group of people was used to test the effectiveness of a new toothpaste compared to their regular toothpaste. Which of the following procedures represents a controlled test?

• Have everyone in the group brush with the new toothpaste.

• Have everyone brush with both their regular toothpaste and the new toothpaste.

• Have half the group brush with the new toothpaste and the other half not brush their teeth.

• Have half the group brush with the new toothpaste and the other half with their regular toothpaste.

An experiment is carried out to determine how different pH values of soil will affect the growth of tomato plants. In this experiment, the dependent variable could be the

• height of the tomato plants

• pH of the soil

• specific variety of tomato plants used

• pH of enzymes in tomato leaf cells

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

Why is it important to accurately record the procedures and results of an experiment?

• So that you know what you did.

• So that others can admire your work.

• So that others can check to see if you did your experiment correctly.

• So that others can repeat your experiment to see if they get the same results.

Tags

NGSS.MS-LS1-5

NGSS.MS-PS2-5