PS Unit 6 Review

Why is it important to keep constants in an experiment?

• To ensure the results are due to the independent variable

• To make the experiment more complex

• To increase the number of variables

• To make the experiment longer

Which statement contains a conclusion?

• The scientist goes back to the laboratory and fills each of two beakers with 1 liter of fresh water. Then he dissolves 35 grams of table salt in one of the beakers.

• They examine both beakers and finds the fresh water to be frozen. The salt water is still liquid.

• The scientist writes, “It appears that salt water freezes at a lower temperature than fresh water does.”

• The scientist then places both beakers in a freezer at -1 degree Celsius and leaves in the freezer for 24 hours.

Tags

NGSS.MS-PS1-2

David and Aria are preparing a report for an international science fair. What system of measurement should they use to ensure their data is universally understood?

• They should use local measurement units.

• They should use the International System of Units (SI Units).

• They should use customary units.

• They should use a conversion chart for different units.

Scarlett measures a quantity of water and determines it to be 250 milliliters. What quantity of measurement did she determine?

• Mass

• Volume

• Distance

• Time

A scientist is studying the impact of light exposure on the growth rate of plants. What is the independent variable?

• A. scientist

• B. plants

• C. light exposure

• D. growth rate

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Rohan is conducting an experiment to see how different amounts of sunlight affect the growth of plants. Which variable is changed or manipulated by Rohan in the experiment?

• A. control

• B. dependent variable

• C. independent variable

• D. constant

Tags

NGSS.MS-LS1-5

Which of the following best describes a dependent variable?

• The variable that is changed or controlled in an experiment

• The variable that is measured and affected in an experiment

• The variable that remains constant throughout the experiment

• The variable that is used as a reference point

Which of the following statements about density is TRUE?

• density is a physical property of matter and sizes doesn't matter.

• density is not a property of matter and so density depends on the size of the object.

• density of a small piece of gold and a large piece of gold will be different.

Particles will move faster and farther apart when its state changes from _______.

• liquid to solid

• gas to liquid

• liquid to gas

Tags

NGSS.MS-PS1-4

Which of the following is NOT accelerated motion?

• a ball being juggled

• a person walking at 2.5 m/s along a straight road

• a braking cyclist