S8P1a Which is an example of a mixture?
S8P1a Which of the following is an example of a pure substance?
S8P1a Ammonia can be represented by the chemical formula NH3. Which of the following best describes ammonia?
S8P1a An unknown substance is provided in a science class. It consists of particles that are different colors and different sizes. The particles are unevenly distributed throughout the substance. The substance is ___________.
S8P1a A diagram of a particle is shown above. The particle is most likely _________.
S8P1e Which are the name and atomic number for the element?
S8P1e An atom of the element has how many protons?
S8P1e Which of the following could be the chemical symbol representing the element cobalt?
S8P1e The model shows a neutral atom. How many protons are in this atom?
S8P1e In which period, or row, of the periodic table would you find this element?
S8P1b Which type of arrangment and movement would particles of mercury display?
S8P1b In which state of matter do particles spread and fill the volume of the container that holds them?
S8P1b How is plasma different from gas?
S8P1c A scientist performs an investigation in which thermal energy is removed from a sample of a substance. When the substance begins to change from a gas to a liquid, the scientist measures the temperature of the substance. This temperature is the substance's _______
S8P1cd Which of the following is an example of a chemical change?
S8P1cd What happens during a physical change?
S8P1cd When enough heat is added to liquid water, it boils, and bubbles of water vapor rise to the surface and into the air. Which type of change is this and why?
S8P1cd A sample of aluminum has a volume of 3.0 cm3 and a mass of 8.1g. Which is the density of aluminum?
S8P1f According to the law of conservation of matter, which of the following is true?
S8P1f Look at the incomplete chemical equation: Ca + Cl2 --> ?
The reactants are shown. How many chlorine (Cl) atoms must be present in the product that forms this reaction?
S8P1f During a chemical reaction, methane (CH4) and oxygen (O2) combine to produce carbon dioxide (CO2) and water (H2O). The balanced chemical equation identifies the reactants and products for this reaction, along with some of their masses.
CH4 + 2O2 --> CO2 + 2H20
16g + ? --> 44g + 36 g
Which mass of oxygen (O2) is required for this reaction to occur?
S8P3a What is the runner's average speed?
S8P3a If the runner continues at the same speed, how far will the runner travel in 30 seconds?
S8P3a Which data table represents an object that is decelerating?
S8P3b A rocket is traveling through the atmosphere at a constant velocity. Which of the following is true?
S8P3b Student A and Student B are each standing on a skateboard. Student A pushes gently on Student B to start her moving. Student B starts moving away from Student A. What will happen to Student A and why?
S8P3c How is an object's mass related to the force needed to accelerate the object?
S8P5a Two objects move away from each other. What happens to the gravitational attraction between them?
S8P5a Which of the following statements about gravitational fields is true?
S8P3b When a rocket attempts to launch, its engine exerts a force downward. The rocket will not launch until the force of the engine is greater than the weight of the rocket. Why?
S8P3b If an object falls far enough, it will reach terminal velocity. At this velocity, the force of air resistance is equal to the force of gravity on the object. The forces on the falling object are balanced. What will happen to the object and why?
S8P5abc Two balloons are rubbed with a wool cloth. When the balloons are held near one another, they push away from each other. Why does this happen?
S8P5abc Which of the following is evidence that a magnetic field surrounds a magnet?
S8P5abc A magnet sticks to a table leg. Based on this information, which material could the table leg be made of?
S8P5abc Two negatively charged particles are 1 millimeter apart. The electric force between them is 20 newtons. How will the amount of electric force between the particles change if the particles move closer together?
S8P5ac Which material could be used for the core of an electromagnet?
S8P5ac What does the iron core of an electromagnet do?
S8P5ac An engineer built a device. The main part of the device is a bicycle attached by wires to a light bulb. When the engineer pedals the bicycle, the light bulb lights up. How can the device best be classified?
S8P5ac A student built a simple fan using an electromagnet, a permanent magnet, and a fan blade. When she connects the electromagnet to a single dry-cell battery, the fan blade turns. How would the student's fan most likely change if she connected it to two dry-cell batteries?
S8P2b At which point does the pendulum have the greatest potential energy?
S8P2b At which point does the pendulum have the greatest kinetic energy?
S8P2a Four objects are on a shelf 1.5 meters above the ground: a 350 gram trophy, a 100 gram picture frame, a 225 gram book, and a 600 gram vase. Which object has the most potential energy?
S8P2b A student throws a ball straight up. What happens to the ball's energy as it rises?
S8P2c Which of the following is a form of potential energy?
S8P2b A motor uses the magnetic field produced by an electric current to spin an armature. What kind of transformation takes place inside a motor?
S8P2b Which of the following is the best example of a form of kinetic energy being transformed into a form of potential energy?
S8P2c Which of the following is not a source of stored chemical energy that can be turned into a form of kinetic energy?
S8P2d In which direction does heat move?
S8P2d A metal spoon is placed in a pot of boiling water. Why does the spoon become hot over time?
S8P2d How is convection different from conduction?
S8P2d Which is an example of heat transfer through radiation?
S8P4a Which statement about waves is true?
S8P4f Wave A and Wave B have the same frequency and wavelength. Wave A has a greater amplitude than Wave B. Which statement best compares the two waves?
S8P4a Which waves contain compressions and rarefactions?
S8P4f A bell and a siren are producing sound waves. The sound wave produced by the bell has a low frequency. The sound wave produced by the siren has a high frequency. Based on this information, which of the following must be true?
S8P4f A musician is playing an electric guitar. She turns a knob to increase the amplitude of the sound wave produced. How does the sound change?
S8P4a What kind of wave is a sound wave?
S8P4d A student yells from one side of Canyon A and records the time it takes to hear an echo. The student repeats the process for Canyon B. The time recorded for Canyon B is longer than for Canyon A. Which is the most likely conclusion based on this information?
S8P4e In which medium would sound waves travel fastest?
S8P4a How do electromagnetic waves differ from mechanical waves?
S8P4b The chart above shows the range of wavelengths for different types of electromagnetic waves. Use the data in the chart to answer the question: Which of the waves transmits the least energy?
S8P4c A scientist exposes a sample of the mineral fluorite to EM waves, causing the fluorite to glow. Which kind of EM wave did the scientist use?
S8P4c Both gamma rays and x-rays
S8P4c Which kinds of EM waves are you most likely to experience while sitting at a campfire?
S8P4d What happens to a light wave that is absorbed by matter?
S8P4d Which statement explains why a green leaf looks green?
S8P4d In the diagram above, the solid arrow represents a light wave traveling through air. Which dashed arrow represents the path the light will travel after reaching the glass?
S8P4g Which of the following best describes the purpose of a lens in a camera?