STAAR SCIENCE PRACTICE 4

Which pair of elements has reactivity that is similar to chlorine, Cl?

• Fluorine, F, and argon, Ar

• Fluorine, F, and iodine, I

• Sulfur, S, and bromine, Br

• Sulfur, S, and argon, Ar

Plants that live on the floors of densely populated forests must compete for sunlight. Which type of leaves are most likely found on plants that are best suited to living on the floor of a dense forest?

• Leaves that are needle-shaped

• Leaves that are smallest

• Leaves that store the greatest amount of water

• Leaves with the greatest amount of surface area

Tags

NGSS.3-LS4-3

NGSS.4-LS1-1

Two solutions are mixed and react to produce the solid precipitate AgCl. The chemical reaction is shown by the balanced chemical equation.

AgNO3 + NaCl → AgCl + NaNO3

What happens to the total mass as the reaction takes place?

• The mass increases.

• The mass decreases.

• The mass remains constant.

• The mass first decreases and then increases.

Tags

NGSS.5-PS1-2

• The sun stops sending light to Earth at night.

• Earth moves farther away from the sun at night.

• The tilt of Earth causes less light to reach Earth at night.

• Earth rotates and causes different parts of Earth to experience night.

Tags

NGSS.MS-ESS1-1

A toy truck is at rest on the floor.

Which statement describes the forces acting on the toy truck?

• The forces are balanced so motion occurs.

• The forces are balanced so no motion occurs.

• The forces are unbalanced so motion occurs.

• The forces are unbalanced so no motion occurs.

Tags

NGSS.3-PS2-1

One of the properties that makes copper, Cu, useful for household wiring is its ability to conduct electricity.

Which other element is most likely to conduct electricity?

• Gold, Au

• Radon, Rn

• Bromine, Br

• Nitrogen, N

Tags

NGSS.4-PS3-2

NGSS.5-PS1-3

Parus major is a bird species that depends on caterpillars as a food source for its young. Caterpillars are most abundant during spring. The yearly increase in temperatures during springtime has gradually shifted, resulting in caterpillars developing approximately two weeks earlier than in the past.

How will the changes in the availability of caterpillars most likely affect future populations of P. major?

• P. major will change their food source to plant leaves.

• P. major will lay their eggs earlier in the year.

• P. major will decrease the number of eggs laid at a time.

• P. major will hunt caterpillars earlier in the day when temperatures are cooler.

Tags

NGSS.3-LS4-3

NGSS.3-LS3-2

NGSS.3-LS4-4

• The mother moves forward, and the daughter moves backward with a greater acceleration.

• Both move forward, but the mother moves with a greater acceleration.

• The mother moves backward, and the daughter moves forward with a greater acceleration.

• Both move backward, but the daughter moves with a greater acceleration.

Tags

NGSS.MS-PS2-1

A large rock is motionless on a flat sidewalk.

Which statement best explains why the rock remains motionless?

• There are no forces acting on the rock.

• The only force acting on the rock is directed toward the sidewalk.

• The forces acting on the rock are all balanced.

• The sidewalk exerts an unbalanced force on the rock.

Tags

NGSS.3-PS2-1

• Moving at a constant speed

• Accelerating

• Moving toward the north

• Stopped