EOCT Review Questions

Which action should the student take in step 3 to determine the speed of the car, and which analysis of the speed of the car is correct?

• step 3. Count the total number of dots on the ticker tape. analysis: The speed remained constant during the entire period.

• step 3. Measure the distance between each successive dot on the ticker tape. analysis: The speed decreased at first and then became constant.

• step 3. Count the total number of dots on the ticker tape. analysis: The speed continued to increase during the entire period.

• step 3. Measure the distance between each successive dot on the ticker tape. analysis: The speed increased at first and then became constant.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-1

Metals in group 1 on the periodic table most commonly form which type of ion?

• 2- ion

• 1- ion

• 1+ ion

• 2+ ion

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Use this chemical equation to answer the question.

__CuS + __KCl → __CuCl₂ + __K₂S

What coefficient of KCl will balance the equation?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-5

A student is modeling the units in the formula for aluminum sulfide using the spheres shown below to represent aluminum (Al) and sulfur (S) atoms.

Which model correctly shows a stable ionic compound for aluminum sulfide?

• 
• 
• 
• 

Tags

NGSS.MS-PS1-1

A student investigated the energy transformations that occur when a call is placed from cell phone A and received by cell phone B. The student drew a diagram to show the process.

Based on the diagram, what evidence is there for the transformation of chemical energy into electrical energy, and which other energy transformations must occur for the call to be received by cell phone B?

• evidence: Cell phones are powered by a battery that produces the electricity used to send or receive a call. transformation 1: Sound energy is transformed into electrical energy by cell phone A. transformation 2: Electrical energy is transformed into mechanical energy in the cell towers and base station.

• evidence: Cell phones are powered by a battery that produces the electricity used to send or receive a call. transformation 1: Sound energy is transformed into electromagnetic waves by cell phone A. transformation 2: Electromagnetic waves are transformed back into sound energy by cell phone B.

• evidence: Base stations are powered by a battery that produces the electricity used to receive and forward a call. transformation 1: Sound energy is transformed into electrical energy by cell phone A. transformation 2: Electrical energy is transformed into mechanical energy in the cell towers and base station.

• evidence: Base stations are powered by a battery that produces the electricity used to receive and forward a call. transformation 1: Sound energy is transformed into electromagnetic waves by cell phone A. transformation 2: Electromagnetic waves are transformed back into sound energy by cell phone B.

Tags

NGSS.MS-PS3-5

According to the graph, what is the maximum approximate mass of KNO3 that would dissolve at 60°C and what is the relationship between temperature and solubility?

• The mass is approximately 140 g; increased temperatures lead to a decrease in solubility.

• The mass is approximately 110 g; increased temperatures lead to an increase in solubility.

• The mass is approximately 140 g; increased temperatures lead to an increase in solubility.

• The mass is approximately 110 g; increased temperatures lead to a decrease in solubility.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

A student did an investigation to determine the effect of a magnetic field on a moving steel sphere. The student recorded the motion of the steel sphere in trial 1 and then drew the desired motion of the steel sphere for trial 2 as shown in the diagram.

If the steel sphere has the same initial velocity in both trials, which action would BEST help to achieve the motion of the steel sphere shown in trial 2?

• putting a resistor between the battery and switch

• replacing the nail with one made out of aluminum

• reversing the direction of the poles of the iron core

• increasing the number of coils of insulated copper wire

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

NGSS.MS-PS2-3

A scientist is measuring the mass of two boron atoms. One atom has a mass of 10 units. The other atom has a mass of 11 units. This is a model of a boron atom with a mass of 11 units.

Which subatomic particle needs to be removed from the model to represent a boron atom with a mass of 10 units?

• Particle L

• Particle M

• Particle N

• Particle P

Tags

NGSS.MS-PS1-1

To investigate Newton’s second law of motion, a student used a motion sensor and a spring scale to measure the force acting on a lead block as it was pulled in the direction of the arrow, across the top of a table. A diagram of the setup is shown.

The student measured a force of 1.5 newtons (N) acting on the lead block. The student expected the block to accelerate in the same direction as the arrow; however, as the block moved across the table, the motion sensor detected a constant velocity. The student interpreted the results and claimed that Newton’s second law does not always apply. Which explanation BEST describes why the student’s claim is invalid?

• The 1.5 N reading on the spring scale is due to the force of friction acting in the opposite direction of the motion, since the net force is zero at constant velocity. Without friction, the lead block would have accelerated at 0.33 m/s2 .

• The 1.5 N reading on the spring scale is due to the net force of 1.50 N to the right acting on the block, as indicated by the constant velocity to the right. Without this force, the lead block would have accelerated at 0.33 m/s2

• The 1.5 N reading on the spring scale is due to the force of friction acting in the opposite direction of the motion, since the net force is zero at constant velocity. Without friction, the lead block would have accelerated at 3.0 m/s2

• The 1.5 N reading on the spring scale is due to the net force of 1.50 N to the right acting on the block, as indicated by the constant velocity to the right. Without this force, the lead block would have accelerated at 3.0 m/s2

Tags

NGSS.HS-PS2-1

A student is investigating the differences between light waves and sound waves. The student does this by using a capsule filled with solid glass at one end and a vacuum at the other end. The student will transmit waves into the capsule at a 30° angle to the (normal) center line.

Which TWO questions should the student ask, and which predictions are MOST LIKELY correct based on this investigation?

• question: How are electromagnetic waves and mechanical waves affected when traveling from a solid glass medium to a vacuum? prediction: The electromagnetic waves and mechanical waves will continue through the vacuum at a lower speed.

• question: How is the speed of electromagnetic waves affected when traveling from a solid glass medium to a vacuum at a 30° angle? prediction: The electromagnetic waves will travel in a straight line, showing that they have maintained a constant speed.

• question: How are electromagnetic waves and mechanical waves affected when traveling from a solid glass medium to a vacuum? prediction: The electromagnetic waves will continue through the vacuum, while the mechanical waves will go no farther.

• question: Can electromagnetic waves and mechanical waves travel from a solid glass medium into a liquid medium?

  prediction: Both electromagnetic waves and mechanical waves will bend, showing that they have passed through each medium.

• question: How is the speed of electromagnetic waves affected when traveling from a solid glass medium to a vacuum at a 30° angle? prediction: The electromagnetic waves will bend downward, showing that they have sped up slightly.

Tags

NGSS.MS-PS4-2