THIS IS With Your Host at Bellbrook Jr. High... Matter-A Matter-B Motion Force-C Motion Force-D Energy-E Energy-F 100 100 100 100 100 100 200 200 200 200 200 200 300 300 300 300 300 300 400 400 400 400 400 400 500 500 500 500 500 500 Why do the same volumes of different substances often have different masses? A.They have different densities. B.They have different hardnesses. C.They have different melting points. D.They have different degrees of electrical conductivity. A 100 A. They have different densities. A 100 Which statement best describes electrons? A. They are positively charged particles located in the nucleus. B. They are negatively charged particles located I the nucleus. C. They are positively charged particles that move around the nucleus. D. They are negatively charged particles that move around the nucleus. A 200 D. They are negatively charged particles that move around the nucleus. A 200 Which is the best description of an element? A.A substance made of one type of atom. B.A substance made of different kinds of atoms. C.A substance with positively and negatively charged atoms. D.A substance with different properties than its individual atoms. A 300 A. A substance made of one type of atom. A 300 Use the table below to answer the question. A scientist collects a sample of one cubic centimeter (1 cm3) of each of the elements on the table. Which of these volumes will have the greatest mass? A. Iron B. Boron C. Calcium D. Magnesium A 400 A. Iron A 400 Use the table below to answer the question. Drill bits are often coated to make them harder, so that they can drill through many different types of materials. A coating of which element from the table would make a drill bit the hardest? A. Iron B. Boron C. Calcium D. Magnesium A 500 B. Boron A 500 Scientists heat one liter of water until it boils. How do they know this is a physical and not a chemical change? A.Bubbles appear in the water. B.The water seems to disappear. C.The water keeps the same chemical properties. D.The temperature of the boiling water remains at 100 C B 100 C. The water keeps the same chemical properties. B 100 Use the table below to answer the question. A group of scientists is studying how elements change from solids to liquids. They can create small bricks of boron, magnesium, calcium, and iron. Each brick is 1 cm3. They place the bricks in an oven and gradually heat them to 1,000 C. At that temperature, which pair of bricks will still be in a solid state? A. Boron and iron B. Calcium and iron C. Magnesium and boron D. Magnesium and calcium B 200 A. Boron and iron B 200 Two substances are physically blended together without chemically reacting. They retain their original chemical and physical properties. What is the combination of these substances called? A.A mixture B.A molecule C.An element D.A compound B 300 A. A mixture B 300 The density of water is 1 cm3. Substances whose density is less than that of water will float on the surface of water. Which of the following objects will float on water? B 400 B 400 All forms of matter undergo change. Identify two differences between physical changes and chemical changes. Then provide on example of each type of change. B 500 •In a physical change, the arrangement of atoms stays the same, while in a chemical change, the atoms are rearranged. •In a physical change, substances keep the same physical properties, while in a chemical change, new substances are created with new chemical properties. •A physical change is reversible by physical methods, while a chemical change is not reversible by physical methods. •In a physical change, substances do not change their chemical structure, while in a chemical change, substances change their chemical structure. •In a physical change, the same substances simple change their physical properties, while in a chemical change, new substances are created. B 500 Which of the following graphs best represents a car moving at constant speed of 2 m/s? C 100 C 100 What will happen to a moving object if all the forces acting on it are perfectly balanced? A.The object will increase its speed. B.The object will slow down and stop. C.The object will change the direction of its motion. D.The object will continue moving at a constant speed. C 200 D. The object will continue moving at a constant speed. C 200 A truck travels along a highway for a period of 80 minutes. The graph below shows the distance traveled by that truck. According to the graph, during what segment was the truck going at the fastest speed? A. Line F B. Line G C. Line H D. Line I C 300 B. Line G C 300 DAILY Place A Wager DOUBLE C 400 A student is looking out of his bedroom window and sees a caterpillar crawling. He decided to time the movement of the caterpillar. The caterpillar crawls from point A to point B in 5 seconds. What is the caterpillar’s speed? A. 1 cm/s B. 2 cm/s C. 5 cm/s D. 10 cm/s C 400 B. 2 cm/s C 400 Which of the objects on the chart below would require the most force to achieve the same increase in speed on a frictionless surface? A. Egg B. Basketball C. Metal plate D. Glass vase C 500 D. Glass vase C 500 Students are examining the motion of a basketball as part of an experiment in science class. The diagram to the right shows a constant unbalanced force being applied to the basketball. What is one measurement they could take to describe the motion of basketball? A. The weight of the basketball B. The force applied to the ball C. The height that the ball can bounce D. The distance it travels every 5 seconds D 100 D. The distance it travels every 5 seconds D 100 A girl leaves her science class and walks 10 meters north to get a drink at the water fountain. She then turns around and walks another 30 meters south to her mathematics class. What is the distance and direction from her science class to the mathematics class? A. 20 m south B. 40 m south C. 20 m north D. 40 m north D 200 A. 20 m south D 200 Force is measured in newtons (N). Two forces are applied to a ball at rest. One force is twice that of the other. Which diagram best illustrates the direction the ball will move? D 300 D 300 An object is moving at a constant speed. Based on the graph, what is the speed of the object? A.2 m/s B.5 m/s C.10 m/s D.10 m/s D 400 B. 5 m/s D 400 A student throws a ball onto the ground. At first, the ball rolls rapidly. After a few moments the ball stops moving. Why did the ball stop moving? A. The ball was subject to balanced forces. B. Motion always requires an unbalanced force to continue. C. An unbalanced force, friction, stopped the motion of the ball. D. The student did not throw the ball hard enough to keep it rolling. D 500 C. An unbalanced force, friction, stopped the motion of the ball. D 500 A cement block is dropped from a helicopter. The block falls 500 meters. Which statement accurately describes the falling cement block? A. Its potential energy decreases as its kinetic energy increases. B. Its potential energy increases as its kinetic energy decreases. C. Its potential energy is unchanged as its kinetic energy decreases. D. Its potential energy is unchanged as its kinetic energy increases. E 100 A. Its potential energy decreases as its kinetic energy increases. E 100 What happens when a substance is heated? A.The bonds within its atoms break down. B.The molecules of the substance slow down. C.The molecules of the substance move faster. D.The lighter particles in the substance clump together. E 200 C. The molecules of the substance move faster. E 200 Which device changes electrical energy into light energy? A.A flashlight B.A gas stove C.An electric oven D.A hydroelectric power plant E 300 A. A flashlight E 300 A student works after school by mowing lawns. She uses a gasoline-powered lawn mower. As she mows the lawn, the mower gets hot. Which best describes the transformation of energy that occurs? A. Thermal energy - kinetic energy - nuclear energy B. Chemical energy - kinetic energy - thermal energy C. Potential energy - kinetic energy - chemical energy D. Electrical energy - chemical energy - kinetic energy E 400 B. Chemical energy - kinetic energy - thermal energy E 400 Which is a form of kinetic energy? A. Energy of moving molecules in a heated liquid B. Energy stored in the chemical bonds of a substance C. Energy holding together the particles in an atomic nucleus D. Energy stored in an object’s position above Earth’s surface. E 500 A. Energy of moving molecules in a heated liquid E 500 What do geothermal and nuclear power plants have in common? A.They both burn organic materials. B.They both produce carbon dioxide. C.They both produce hazardous wastes. D.They both use thermal energy to turn turbines to make electricity. F 100 D. They both use thermal energy to turn turbines to make electricity. F 100 A group of scientists wishes to examine ways of producing energy that cannot be exhausted. Which energy source should these scientists investigate? A.Oil B.Coal C.Natural gas D.Geothermal F 200 D. Geothermal F 200 What is the original source of the energy found in fossil fuels like coal and oil? A.Radiant energy from sunlight B.Geothermal energy from Earth’s interior C.Hydroelectric energy from running water D.Energy from atomic nuclei splitting apart F 300 A. Radiant energy from sunlight F 300 How are solar energy and wind energy similar? A.Both are able to produce electricity. B.Both are nonrenewable sources of energy. C.Both rely on the power generated by the sun. D.Both produce high amounts of carbon dioxide. F 400 A. Both are able to produce electricity. F 400 What causes us to hear sounds? A.Radiant energy from the sun. B.Acoustic energy from vibrations of air. C.Thermal energy released from molecular motion. D.Chemical energy discharged from photosynthesis. F 500 B. Acoustic energy from vibrations of air. F 500 The Final Jeopardy Category is: Physical Science Please record your wager. Click on screen to begin Final Jeopardy Question Students perform a chemistry experiment by mixing baking soda with vinegar. They mix 4 grams of baking soda with 50 grams of vinegar in a 6-gram plastic cup as shown below. The cup is left uncovered. The students record the mass and temperature of the mixture every 5 seconds. They continue these observations until 10 seconds after they see the mixture stop bubbling. Their data are shown in the table below. The data show that the mass of the cup and its contents decreases while the mixture is bubbling. Explain why the mass of the cup and its contents at 25 seconds is less than the initial total mass of the cup, baking soda and vinegar. Include in your answer a valid scientific reason on which you based your explanation. Click on screen to continue Correct Final Jeopardy Response Click on screen to continue Thank You for Playing Jeopardy! Game Produced by Greene ESC