ACAP Grade 8 Science

A student developed a model of a lithium (Li) atom by showing a total of 7 particles in the nucleus. The student used lithium's position in the periodic table to develop the model.

Required

2

8.1

Required

2

Use the drop-down menus below to describe how the student should label the model.

The electrons should be labeled with __________ charge, the protons should be labeled with __________ charge, and the neutrons should be labeled with __________ charge.

8.1

Required

1

A science lab team examines an unidentified substance and records observations about the substance.

Use the drop-down menus to construct the conclusion that can best be made about the unidentified substance based on these observations.

Before boiling, the unidentified substance should have been classified as a __________ because the components of the substance __________.

8.3.a

Required

1

Two students wanted to investigate whether helium balloons stay inflated longer in warmer environments than in cooler ones. The students filled three balloons with the same volume of helium and placed them in separate containers. They changed the temperature in each container and measured the volumes of the balloons over time.

Use the drop-down menus to correctly describe the relationships the students most likely observed in the experiment.

As the temperature __________, the gas particles' thermal energy increases, causing the __________ of the particles to change and the volume of the balloon to __________.

8.4

Required

1

A student placed a piece of chalk in a glass beaker. The student then added an unknown liquid to the beaker until the chalk was completely covered. The following observations were recorded.

Which observation best supports the claim that a chemical reaction had taken place?

8.5

Required

1

8.8

Required

1

An engineer visited a classroom to demonstrate how a pinball machine works. The part of the machine that launches a ball is called the plunger. The engineer used a steel ball and a brass ball to model how the mass of a ball affects the ball's speed, even when the diameter of each ball is the same. The students observed that when the plunger was released against each ball, the brass ball was slower and did not travel as far compared to the steel ball.

Which statement best explains the students' observation?

8.9

Required

1

A student designed the model shown below to investigate the resulting motion of two colliding billiard balls.

Predict the most likely result of billiard ball X colliding with billiard ball Y.

8.10

Required

1

A student used pith balls and glass rods as shown in the diagram to investigate forces.

The student claimed that when a positively charged rod touches pith balls 1 and 2, an electric field occurs between the two pith balls. 

Complete the diagram to show how the expected results of the investigation would support the student's claim.

Drag a type of force into the top box. Next, drag one pith ball into each side of the diagram.

Which graph best represents the relationship between the kinetic energy (KE = 1/2 mv^2) and the speed of an object?

8.13

A student is examining the relationship between the gravitational potential energy (GPE) and the height of a carriage on a ride. The student draws a model of the ride and labels the height at several points.

Required

2

8.14

Required

2

Use the drop-down menus to explain energy relationships in the model.

The GPE is __________ related to the height of the carriage. Energy is converted to __________ as the carriage drops toward the ground during the ride.

8.14

Required

1

A model of two spheres about to collide is shown.

Drag a label into each box to best describe how energy is affected during the collision.

increases
decreases
stays the same

Kinetic Energy of Sphere X
Kinetic Energy of Sphere Y

8.16

Required

1

The model below shows different sources of waves.

Select the box or boxes in each row to best compare the waves in the model.

	Wave X	Wave Y
requires a medium for transmission
is an electromagnetic wave

8.18

Required

1

The Global Positioning System (GPS) consists of 24 satellites that orbit Earth twice daily. These satellites orbit at an altitude of about 20,000 km. GPS also consists of ground-based receivers that monitor the signals from the satellites. These ground-based receivers keep highly accurate data regarding the positions of these satellites. Precise knowledge of the positions of these satellites allows GPS users on Earth to determine their own locations. A student is evaluating the waves used by GPS.

Use the drop-down menus to best complete the statements.

Satellites use __________ waves to transmit data. One reason that these satellites use this type of wave is because these waves __________.

8.19

ACAP Grade 8 Science

A student placed a piece of chalk in a glass beaker. The student then added an unknown liquid to the beaker until the chalk was completely covered. The following observations were recorded.

Which observation best supports the claim that a chemical reaction had taken place?

A student designed the model shown below to investigate the resulting motion of two colliding billiard balls.

Predict the most likely result of billiard ball X colliding with billiard ball Y.

Which graph best represents the relationship between the kinetic energy (KE = 1/2 mv^2) and the speed of an object?

A model of two spheres about to collide is shown.

Drag a label into each box to best describe how energy is affected during the collision.

The model below shows different sources of waves.

Select the box or boxes in each row to best compare the waves in the model.

Drag the correct number of each type of particle into each box to model a lithium atom.

A student placed a piece of chalk in a glass beaker. The student then added an unknown liquid to the beaker until the chalk was completely covered. The following observations were recorded.

Which observation best supports the claim that a chemical reaction had taken place?

A student performed an investigation on the velocity of a toy car over time. The student recorded the car's velocity in the graph below.

Select the two statements that best describe the movement of the toy car.

A student designed the model shown below to investigate the resulting motion of two colliding billiard balls.

Predict the most likely result of billiard ball X colliding with billiard ball Y.

Which graph best represents the relationship between the kinetic energy (KE = 1/2 mv^2) and the speed of an object?

A model of two spheres about to collide is shown.

Drag a label into each box to best describe how energy is affected during the collision.

The model below shows different sources of waves.

Select the box or boxes in each row to best compare the waves in the model.

Drag the correct number of each type of particle into each box to model a lithium atom.

ACAP Grade 8 Science

ACAP Grade 8 Science

A student placed a piece of chalk in a glass beaker. The student then added an unknown liquid to the beaker until the chalk was completely covered. The following observations were recorded.Which observation best supports the claim that a chemical reaction had taken place?

A student designed the model shown below to investigate the resulting motion of two colliding billiard balls.Predict the most likely result of billiard ball X colliding with billiard ball Y.

Which graph best represents the relationship between the kinetic energy (KE = 1/2 mv^2) and the speed of an object?

A model of two spheres about to collide is shown.Drag a label into each box to best describe how energy is affected during the collision.

The model below shows different sources of waves.Select the box or boxes in each row to best compare the waves in the model.

Drag the correct number of each type of particle into each box to model a lithium atom.

A student placed a piece of chalk in a glass beaker. The student then added an unknown liquid to the beaker until the chalk was completely covered. The following observations were recorded.Which observation best supports the claim that a chemical reaction had taken place?

A student performed an investigation on the velocity of a toy car over time. The student recorded the car's velocity in the graph below.Select the two statements that best describe the movement of the toy car.

A student designed the model shown below to investigate the resulting motion of two colliding billiard balls.Predict the most likely result of billiard ball X colliding with billiard ball Y.

Which graph best represents the relationship between the kinetic energy (KE = 1/2 mv^2) and the speed of an object?

A model of two spheres about to collide is shown.Drag a label into each box to best describe how energy is affected during the collision.

The model below shows different sources of waves.Select the box or boxes in each row to best compare the waves in the model.

Drag the correct number of each type of particle into each box to model a lithium atom.

A student placed a piece of chalk in a glass beaker. The student then added an unknown liquid to the beaker until the chalk was completely covered. The following observations were recorded.

Which observation best supports the claim that a chemical reaction had taken place?

A student designed the model shown below to investigate the resulting motion of two colliding billiard balls.

Predict the most likely result of billiard ball X colliding with billiard ball Y.

A model of two spheres about to collide is shown.

Drag a label into each box to best describe how energy is affected during the collision.

The model below shows different sources of waves.

Select the box or boxes in each row to best compare the waves in the model.

A student placed a piece of chalk in a glass beaker. The student then added an unknown liquid to the beaker until the chalk was completely covered. The following observations were recorded.

Which observation best supports the claim that a chemical reaction had taken place?

A student performed an investigation on the velocity of a toy car over time. The student recorded the car's velocity in the graph below.

Select the two statements that best describe the movement of the toy car.

A student designed the model shown below to investigate the resulting motion of two colliding billiard balls.

Predict the most likely result of billiard ball X colliding with billiard ball Y.

A model of two spheres about to collide is shown.

Drag a label into each box to best describe how energy is affected during the collision.

The model below shows different sources of waves.

Select the box or boxes in each row to best compare the waves in the model.