Science PostassessmentPractice Test

  • What is the difference between motion and speed?
  • How do you calculate the average acceleration of an object?
  • What is the difference between speed and velocity?
  • The forces acting on a light hanging from a ceiling are balanced because…
  • What is Newton’s first law of motion?
  • What is Newton’s second law of motion?
  • What is Newton’s third law of motion?
  • What two factors affect the strength of an object’s gravitational pull?
  • What 3 subatomic particles make up an atom and what are their electric charges?
  • The number of protons in nucleus of an atom is called the...
  • What is the difference between the physical properties and the chemical properties of a substance?
  • What is the difference between an element and a compound?
  • Bobby partially filled a graduated cylinder with water. He then dropped a rock into the water. The illustration below shows what happened to the level of the water inside the graduated cylinder.

What is the volume of the rock?

  • The periodic table is arranged in columns and rows. What are the columns and rows of the periodic table called?
  • Mrs. Rehak shows her students a model of the three states of matter.

Which part (s) of Mrs. Rehak’s model represents a liquid?

  • Below is a square that represents one element of the periodic table.

What information is in this square from top to bottom?

  • What is a scientific theory?
  • The figure below shows three atomic models developed over time.

Why do you think the model of the atom has changed over the years?

  • Identifying the independent and dependent variables in an experiment will help you better interpret and convey results. What is the difference between the independent and dependent variables in an experiment?
  • Scientists are conducting an experiment in which they give people different amounts of Vitamin C to determine whether Vitamin C intake has an effect on how often a person gets sick. What is the dependent variable in this experiment?
  • How do you calculate the average speed of an object?
  • What is the average speed of an object that travels 20 meters in 8 seconds?
  • The following diagram shows the forces acting on a box.

Explain how you calculate the net force in any direction on the box.

Suppose an upward force of 15 N is added to the box. What will be the net vertical force on the box?

How much force could be applied to the box to make the net force in the horizontal direction zero? Explain.

Suppose a force of 25 N to the right is added to the box. What will be the net force to the right?

  • Marisol finds the total mass of a sample of baking soda, a balloon, and a glass container with vinegar in it. She adds the baking soda to the vinegar and places the balloon over the mouth of the container. After the reaction is complete, she again finds the total mass of the system. Using the law of conservation of mass, explain whether the mass inside the flask will stay the same or be different and why.
  • A piano is going to be moved up an inclined plane into a truck. What happens to the potential energy and kinetic energy of the piano as it...

1) sits on the ground

2) is being moved into the truck

3) sits in the truck.

  • How can a plant contribute to the physical weathering of rock?
  • Give 2 examples of chemical weathering of rock and explain how each example is produced.
  • How do water and gravity work together to erode and deposit soil, sediment, and rock? Give an example
  • A student is investigating the particles in a glass window, raindrops on the window, and the air around the window. Assume the window, the raindrops, and the air are all at 25 °C.

1) Identify the state of matter for each sample of matter.

2) Compare the attractions between the particles in each sample of matter.

  • Jane predicts that hot metal objects do not cool at a constant rate. She experiments by heating a metal object and then allows it to cool to room temperature. She measures the temperature of the metal with a thermometer every half hour, and she carefully records her results in her notebook. From her temperature data, she draws the following graph.

Based on the graph, was Jane’s prediction supported or not supported? Explain how you know.

  • What is the difference between a chemical change and a physical change?
  • What are three examples of physical changes?
  • What are three signs that a chemical change has taken place?
  • How does temperature affect chemical changes?