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.

Obavezno

2

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

proton
proton
proton
proton
neutron
neutron
neutron
neutron
electron
electron
electron
electron

in the nucleus
outside the nucleus

8.1

Obavezno

2

8.1

Obavezno

1

8.3.a

Obavezno

1

8.4

Obavezno

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?

The volume of the piece of chalk changed.

The solid chalk and the liquid formed a mixture.

Bubbles formed after the liquid touched the chalk.

A phase change occurred as the liquid evaporated.

8.5

Obavezno

1

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.

The car was at rest between points V and W.

The car was at rest until a force acted on it at point U.

The car was constantly accelerating between points U and X.

The forces acting on the car were balanced between points V and W.

The forces acting on the car were unbalanced between points W and X and between points X and Y.

8.8

Obavezno

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?

The brass ball had less mass than the steel ball, and the plunger was pulled back the same amount for each ball.

The brass ball had more mass than the steel ball, and the plunger was pulled back the same amount for each ball.

The brass ball had less mass than the steel ball, and the plunger was pulled back farther for the brass ball than for the steel ball.

The brass ball had more mass than the steel ball, and the plunger was pulled back farther for the brass ball than for the steel ball.

8.9

Obavezno

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.

Billiard ball Y will remain in the same location because each ball has the same mass.

Billiard ball Y will remain in the same location because the balls have different masses.

Billiard ball Y will move to the left because billiard ball X will transfer energy to billiard ball Y.

Billiard ball Y will move to the right because billiard ball X will transfer energy to billiard ball Y.

8.10

Obavezno

1

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

null

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.

Drugi mogući odgovor:

attractive

repulsive

null

8.12

Obavezno

1

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

null

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.

Obavezno

2

Drag the correct value into each box to show the GPE during the ride.

Drugi mogući odgovor:

75

0

50

25

100

8.14

Obavezno

2

8.14

Obavezno

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
Total Kinetic Energy of the System

8.16

Obavezno

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

Obavezno

1

8.19

ACAP Grade 8 Science

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 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.

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.

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.