Grade 8 Unit 1 Test Matter Take 2

Cells are the smallest unit of a living organism; therefore, atoms would be the smallest unit of ____.

• Matter

• Mass

• Weight

• Periodic Table

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A group of students wants to investigate the effect of music on memory retention. They plan to have three groups of participants: one group studying with classical music, another with ambient sounds, and a control group studying in silence. Which is the most important step they should take to ensure their investigation is scientific?

• Use different study materials for each group.

• Change the study duration for each participant.

• Measure and record the recall performance daily.

• Ensure all participants have identical study conditions.

Eric sets up three groups of identical crystal-growing solutions exposed to low, medium, and high-frequency sounds, respectively, and measures their growth over a month. What could Eric find out about the crystal growth from conducting this experiment?

• If the sound frequency affects how much solution is needed for crystal growth.

• If the type of solution affects how fast the crystals grow.

• If the amount of solution affects how large the crystals grow.

• If the sound frequency affects how large the crystals grow.

Tags

NGSS.MS-PS4-2

A science class is investigating how the temperature of water affects the rate at which sugar dissolves. They conduct three experiments using water at different temperatures: cold, room temperature, and hot. What is the variable being tested in this experiment?

• The temperature of the water.

• The type of sugar used.

• The amount of water used.

• The time taken for sugar to dissolve.

A group of students wants to investigate how different types of fabric affect the drying time of towels. They conduct an experiment where they wet towels made of cotton, polyester, and microfiber and hang them outside on a sunny day. They measure the time it takes for each towel to completely dry. What is the dependent variable in this experiment?

• A. The type of fabric

• B. The drying time of the towels

• C. The amount of sunlight

• D. The temperature outside

Convection currents play a crucial role in distributing heat and nutrients in ocean waters. Which of the following best explains how convection currents work in the ocean?

• A. Cold water sinks to the bottom while warm water rises to the surface, creating a circular movement.

• B. Warm water sinks to the bottom while cold water rises to the surface, creating a circular movement.

• C. Water moves horizontally across the ocean surface without changing depth.

• D. Warm water stays at the surface and does not mix with cold water at all.

Tags

NGSS.MS-ESS2-6

Steve and Stacy are standing on different planets, as shown in the image above. The gravitational acceleration on Planet A, where Steve is, is 3m/s² while the gravitational acceleration on Planet B, where Stacy is, is 9 m/s². If both Steve and Stacy have the same mass of 70 kg, who would weigh more?

• A. Steve on Planet A

• B. They would weigh the same

• C. Stacy on Planet B

• D. It cannot be determined from the information given

Tags

NGSS.MS-PS2-4

For a science experiment, students are investigating the boiling point of water. They have two beachers: Beaker A containing 300 mL of water and Beaker B containing 150 mL of water.

When both beakers are heated to boiling, what will the students observe?

• The water in Beaker A will boil at a lower temperature.

• The water in Beaker B will boil at a higher temperature.

• Both samples will boil at different temperatures because the container shapes affect the boiling point.

• Both samples will boil at the same temperature.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

When both beakers are heated to boiling, what will the students observe?For a science experiment, students are investigating the boiling point of water. They have two beachers: Beaker A containing 300 mL of water and Beaker B containing 150 mL of water.

• The water in Beaker A will boil at a lower temperature.

• The water in Beaker B will boil at a higher temperature.

• Both samples will boil at different temperatures because the container shapes affect the boiling point.

• Both samples will boil at the same temperature.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Mia is baking cookies in her kitchen. She notices that the metal handle of the oven gets hot even though it's not directly touching the heating element. She also feels the warmth from the oven when she stands near it, and she observes that the cookies are baking evenly throughout the oven.

Based on Mia's observations, what type of heat transfer is primarily responsible for the cookies baking evenly throughout the oven?

• Radiation

• Convection

• Conduction

• Absorption