Science 8 STAAR Practice 9

Atoms of which two elements are represented by these models?

• Oxygen‚ O, and neon, Ne

• Fluorine, F, and neon, Ne

• Silicon, Si, and phosphorus, P

• Beryllium, Be, and boron, B

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NGSS.MS-PS1-1

If a fluorine atom has a mass number of 19, how many neutrons are in the atom?

Which rocket had the greatest acceleration?

• Rocket 1

• Rocket 2

• Rocket 3

• Rocket 4

Tags

NGSS.MS-PS2-2

Sea anemones and clown fish live together in the ocean. Which statement best describes one way sea anemones depend on clown fish for an abiotic factor in an ecosystem?

• Clown fish protect sea anemones from predatory fish.

• Clown fish decrease competition among sea anemones.

• Clown fish consume the remains of organisms paralyzed by sea anemones.

• Clown fish move water near sea anemones when dissolved oxygen levels are low.

Tags

NGSS.MS-LS2-2

Which statements accurately describe the potential and kinetic energy of this bicyclist?

• Kinetic energy increases. Potential energy decreases.

• Kinetic energy increases. Potential energy remains constant.

• Kinetic energy remains constant. Potential energy decreases.

• Kinetic energy remains constant. Potential energy increases.

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NGSS.MS-PS3-1

NGSS.MS-PS3-5

Which of these is most likely observed in an area experiencing a long-term drought?

• Trees with broad leaves will be more healthy than trees with needlelike leaves.

• Trees with leaves that have waxy coverings will be more healthy than trees without wax-covered leaves.

• Trees with broad leaves will be more healthy than trees with small, flat leaves.

• Trees with leaves without any hairlike structures will be more healthy than trees with leaves covered by hairlike structures.

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NGSS.MS-LS2-1

NGSS.MS-LS1-5

Which type of boundary results in the spreading of the oceanic ridge?

• Convergent boundary

• Subduction boundary

• Transform boundary

• Divergent boundary

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NGSS.MS-ESS2-3

When a coin is tossed in the air, it travels upward, gradually slows down, momentarily reaches zero speed, then moves back downward with increasing speed. Which statement best explains this change in the coin’s motion?

• The force of gravity causes the coin to change its velocity.

• The coin’s inertia decreases on the way up and increases on the way down.

• The action-reaction force pair of gravity and the applied force cancel each other.

• The coin remains in its state of upward motion until the force of friction acts upon it.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

Alpha Centauri appears as a bright object visible in the Milky Way galaxy. Alpha Centauri is actually a system of three objects. Each object produces light and rotates on its own axis. The system is an average of 4 light-years from Earth.

Based on this information, the three objects that make up the Alpha Centauri system are all —

• asteroids

• comets

• planets

• stars

Which observation would indicate that a chemical reaction occurred?

• The vinegar took the shape of the container in step 1.

• The steel wool sank into the vinegar in step 3.

• The temperature of the vinegar increased during step 4.

• The steel wool changed shape during step 6.

Tags

NGSS.MS-PS1-2