STAAR Science 3.9.23

The chart shows properties of four elements.

Based on these properties, which element is most likely a

nonmetal?

• Element 1

• Element 2

• Element 3

• Element 4

Students performed a lab investigation on chemical reactions. The

students put on goggles and plastic gloves and then followed these

steps.

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.

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.

Four students designed and built air propelled rockets that were

launched into the air. Their data are recorded in the table.

Which rocket had the greatest acceleration?

• Rocket 1

• Rocket 2

• Rocket 3

• Rocket 4

Humans depend upon food that comes from the ocean. Some

human activities negatively impact these food supplies.

Which statement provides the best evidence that human activities

contribute to this impact?

• Human visitors to coral reef systems break corals growing on

  rocks.

• Humans catch marine fish at a faster rate than the fish are able

  to reproduce.

• Humans raise fish in a hatchery for commercial sale.

• Humans construct artificial reefs to attract tourists.

The photograph shows a satellite view of the desert coast of Egypt

and the Red Sea.

Researchers predict that in the future, the land area of point X will

be reduced by erosion.

Which event will cause the most weathering and erosion to the land

area at point X?

• Increasing salinity of seawater near the land

• Intense rays from the sun striking the land

• Solids floating in seawater depositing on the land

• Strong storm winds blowing across the land

Which element has chemical properties that are most similar to the

chemical properties of sulfur, S?

• Silicon, Si

• Chlorine, Cl

• Phosphorus, P

• Selenium, Se

Which of these observations is an indication that a chemical

reaction has occurred?

• A solid forms when two clear solutions are mixed.

• A solid forms when a clear solution is frozen.

• Steam forms above boiling water.

• Sugar crystals form on the sides of a boiling pot of sugar water.

The diagram shows a model of an atom. The model contains three

different subatomic particles. Particles X and Y are inside the

nucleus, and particle Z is outside of the nucleus.

Which statements best describe the charges on the particles in this

model?

• Both particles X and Y have a positive charge.

  Particle Z has a negative charge.

• Both particles X and Y have a negative charge.

  Particle Z has a positive charge.

• Either particle X or particle Y has a positive charge.

  Particle Z has a negative charge.

• Either particle X or particle Y has a negative charge.

  Particle Z has a positive charge.

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.