Leap 2025 Science

What causes the glow stick to produce light?

• A new material is formed when the glass mixes with Chemical W.

• A new material is formed when the glow stick's temperature changes.

• A new material is formed when Chemical X and Chemical W are shaken.

• A new material is formed when Chemical X is mixed with Chemical W.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A teacher tells her students that a space probe called Voyager 1 was launched in 1977. Voyager 1 is traveling away from Earth and the Sun. Until 1990, it took pictures as it moved away from the Sun along the path shown in the diagram. How did the appearance of the Sun change in the pictures taken by Voyager 1 as it moved along its path?

• The Sun appeared to become larger as Voyager 1 moved farther away from the Sun.

• The Sun appeared to become less bright as Voyager 1 moved farther away from the Sun.

• The Sun appeared to become a different color as Voyager 1 moved farther away from the Sun.

• The Sun appeared to become a different shape as Voyager 1 moved farther away from the Sun.

Tags

NGSS.MS-ESS1-1

Dry ice goes from a solid directly to a gas when it gets warmer. Students placed a small piece of dry ice inside a balloon, added air to the balloon, and sealed it. The figure shows the balloon and the dry ice at the beginning and end of the experiment. Which statement BEST describes the balloon and the dry ice at the end of the experiment?

• The total mass decreased and the total volume increased.

• The total mass increased, and the total volume decreased.

• The total mass remained the same, and the total volume increased.

• The total mass decreased, and the total volume remained the same.

Tags

NGSS.MS-PS3-4

A student observes what happens when he releases a wadded-up piece of paper, a baseball, and a rock from one meter above the ground all at the same time. All three objects move in the same direction.

Which claim can be made based on the student's observation?

• The volume of the objects causes the objects to fall down toward Earth.

• The rotation of Earth causes the objects to fall down toward Earth.

• The density of the objects causes the objects to fall down toward Earth.

• The gravitational force of Earth causes the objects to fall down toward Earth.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

A student observes what happens when he releases a wadded-up piece of paper, a baseball, and a rock from one meter above the ground all at the same time. All three objects move in the same direction.

Which piece of evidence BEST supports your answer to Question 20?

• The rock made the loudest noise when it hit the ground.

• The baseball and rock hit the ground just before the paper did.

• The paper, the baseball, and the rock all fell when the student let go of them.

• The paper and the baseball bounced several times after they hit the ground.

Tags

NGSS.MS-PS2-4

What is the primary source of energy for food webs and food chains?

• producer

• consumer

• water

• Sun

What observations can be used as evidence to support his claim?

• rain falling from the clouds

• leaves moving on a windy day

• blowing into a balloon to inflate it

• temperatures rising on a sunny day

• tossing a basketball through the air

Tags

NGSS.MS-PS3-5

What kind of data should the scientist collect to determine whether the ice sheet is changing size?

• Measure the depth of the ice sheet for several months.

• Measure the mass of the ice sheet for several weeks.

• Measure the area and thickness of the ice sheet for several years.

• Measure the width of the ice sheet from satellite images for several days.

Tags

NGSS.HS-ESS2-5

Turner is investigating the conservation of matter. He puts a small rock in a plastic bag and seals it. He then hits the rock with a hammer. He observes that the rock breaks into small pieces and that dust coats the inside of the bag. Which observation BEST shows that matter is conserved?

• The mass of the dust plus the mass of the small pieces of rock equals the mass of the original rock.

• The mass of the dust equals the mass of the small pieces of rock plus the mass of the original rock.

• The mass of the small pieces of rock minus the mass of the dust equals the mass of the original rock.

• The mass of the dust plus the mass of the small pieces of rock is greater than the mass of the original rock.

Tags

NGSS.MS-PS1-5

Scientist suggest that the movement of Earth's liquid iron core results in electrical currents. These currents would then result in Earth's magnetic field. Recent satellite data suggest that the strength of Earth's magnetic field has weakened by about 3.5 percent in some areas. In other areas, Earth's magnetic field strength has increased by about 2 percent. Which statement best explains the differences in Earth's magnetic field strength based on the movement of Earth's liquid iron core?

• The movement of Earth's liquid iron core stopped in both locations.

• The movement of Earth's liquid iron core changes direction in some locations.

• The movement of Earth's liquid iron core is the same in all locations

• The movement of Earth's liquid iron core increased speed in both locations.