44On a hot day, Jenny walked home with a bag of chocolate chips On a hot day, Jenny walked home with a bag of chocolate chips. When she arrived the chocolate chips had melted in the bag. Why did they melt? Heat transferred from the chocolate chips to the bag Heat evaporated from the bag to the chocolate chips Heat transferred from the environment to the chocolate chips Heat condensed from her hand to the chocolate chips.
45Energy appears in many forms. What form of energy is lightning Energy appears in many forms. What form of energy is lightning? electrical energy mechanical energy magnetic energy sound energy
46A glass of water kept at room temperature long enough will become empty because water molecules slowly leak through the walls of the glass. water molecules move into the air as gas molecules. water left in a glass starts to boil and becomes a gas. water slowly combines with oxygen to become carbon dioxide.
47Water that flows from behind a large dam can cause machines to produce electricity. What change takes place? Heat energy changes into mechanical energy. Sound energy changes into electrical energy. Chemical energy is used to produce electrical energy. Mechanical energy is used to produce electrical energy
48When ice cream is left out of the freezer on a table for a long time, it melts. This change in state is caused by the ice cream absorbing heat. ice cream giving up heat. air absorbing heat. table absorbing heat
49People in many places in California produce their electricity from wind energy. Which must be true about the winds in these places in California? The winds are cold. The winds blow very little. The winds blow most of the time. The winds blow mostly in the morning.
50A block of ice on a glass plate is put on a metal shelf in a freezer A block of ice on a glass plate is put on a metal shelf in a freezer. Which could cause the ice to change to liquid water? putting a fan that blows on the ice inside the closed freezer raising the temperature inside the freezer wrapping a blanket around the ice inside the freezer putting the ice directly on the metal shelf inside the freezer
51When water boils in a pan on a hot burner, heat gets to the water mainly by… conduction of heat through the pan. radiation of heat through the pan. reflection of heat from the burner. absorption of heat from the air in the room
52When a hair dryer is being used, one of the energy transformations that takes place is electrical to chemical. electrical to mechanical. mechanical to electrical. chemical to electrical
53When electrical energy is "used" by an electric light, what really happens to the energy? It is given off as other forms of energy. It changes to matter. It stops at the electric light. It disappears
54To pull up a bucket of water from a well, George pulled hard on a handle to wind up a rope. Which kind of energy was George applying to the handle? chemical energy frictional energy potential energy mechanical energy
55Josie sees lightning off in the distance Josie sees lightning off in the distance. A few seconds later she hears thunder. What can Josie conclude? Sound waves do not travel long distances. Light waves travel faster than sound waves. Sound waves are weaker than light waves. Light waves last longer than sound waves
58On a cold, winter day, Sheena rubs her hands together On a cold, winter day, Sheena rubs her hands together. Stored chemical energy is transformed into mechanical energy. Due to the Law of Conservation of Energy some of the energy is also transformed into heat energy. light energy. solar energy. kinetic energy.
59Predict the energy transformation that occurs when Carson sands a piece of wood with sandpaper. chemical energy to heat energy heat energy to mechanical energy mechanical energy to heat energy mechanical energy to chemical energy
60Which type of energy involves the movement of charged particles Which type of energy involves the movement of charged particles? heat sound electrical mechanical
61In the simple act of lighting a match, chemical energy stored in the match head is transformed into heat and light. What is true about this energy transformation? Most of the energy is lost when the match is struck. New energy in the form of light and heat is created when the match is struck. All of the potential chemical energy is transformed into heat and light energy. Some of the chemical energy is transformed into heat and light and the rest is converted into matter.
62For a snack, Bill and Mary heated milk in a pot on the stove for hot chocolate and popped some popcorn in the microwave oven. How did they transfer heat energy to make these snacks? heating milk by radiation; popping popcorn by radiation heating milk by radiation; popping popcorn by convection heating milk by conduction; popping popcorn by radiation heating milk by convection; popping popcorn by conduction
68Joe put a cheeseburger sealed in a plastic bag into the microwave, without much air in the bag. After it cooked, the bag was full of air. Where did the air come from?It came from the fan in the microwave.It came out of the cheeseburger.It was already in the bag and it expanded as it was heated.It came from a chemical reaction whereby energy from the microwave creates O2 molecules.
75The bulb of a thermometer is placed in your mouth The bulb of a thermometer is placed in your mouth. Which of the following explains why the level of the liquid rises in the thermometer?Hot air rises inside the thermometer. Heat energy changes into light energy. The liquid expands when heated. Heat can change a solid into a liquid.
76Most events in the universe involve some form of energy transfer.
77turning energy from one form, into another. Energy transferturning energy from one form, into another.
78The major reason for burning gasoline in an automobile engine is to convert chemical energy to mechanical energy.kinetic energy to potential energy.radiation to electrical energy.thermal energy to electrical energy.
79A light bulb changes electrical energy into light energy only. heat and mechanical energy. light and heat energy. light and mechanical energy.
80Something that allows thermal energy to pass easily ConductorSomething that allows thermal energy to pass easilyMetalWaterGlass
81InsulatorSomething that does NOT allowthermal energyto pass easily
82InsulatorSomething that does NOT allow thermal energy to pass easily.
83Conduction the transfer of thermal energy/electrons when objects contact each other. collisions of atoms
84Which of the following best explains why the end of a spoon sticking out of a cup of hot water also gets hot?The hot water causes a chemical reaction to take place in the spoon. The heat from the hot water is conducted to the spoon handle. The hot water heats the air surrounding the upper part of the spoon. The hot water causes a physical change in the spoon handle
85Heating, due to the upward current of hotter material. ConvectionHeating, due to the upward current of hotter material.
87Atmospheric CONVECTION causes Hurricanes and Tornadoes.
88ConvectionWhich of the following is an example of heat transfer by convection?A hot wood stove heats an entire room. The handle of a pot that is being heated becomes warm. A teaspoon in a glass of hot tea becomes warm. The coils of a toaster become red.
89When it is very hot in his room, Stuart makes it cooler by opening both the top and the bottom of his window. Which statement best explains why this works?Air comes in the top to cool the ceiling and in the bottom to cool the floor. Cooler air comes in the bottom and warm air goes out through the top. Warmer air goes out through both the bottom and top. It does not make any difference because if there is no wind, the air will not come in.
90Radiationthe transfer of energy by electromagnetic waves (photons), through space.When light rays hit a material, the molecules in that material move faster.
91Radiationthe transfer of energy by electromagnetic waves, through space.
92When sand absorbs the electromagnetic waves of the Sun, it becomes warm through the process of conduction. convection. radiation. evaporation.
93In which situation has heat energy moved mainly by conduction through matter? A radiator heated with hot water warms a room. The person sitting closest to the blazing fire finds it necessary to move farther from the heat. The handle of a cast iron skillet being used to cook something becomes too hot to touch. The red-hot coil of an electric space heater is used to keep a small room warm.
94Which BEST explains how the food on the stove is being heated? conduction convection interaction radiation
95Which of the following is an example of heat transfer by convection Which of the following is an example of heat transfer by convection? A hot wood stove heats an entire room. The handle of a pot that is being heated becomes warm. A teaspoon in a glass of hot tea becomes warm. The coils of a toaster become red.
96When ice cream is left out of the freezer on a table for a long time, it melts. This change in state is caused by theice cream giving up heat. air absorbing heat.ice cream absorbing heat. table absorbing heat.
97What is the process by which heat energy gets to Earth from the Sun? conduction radiation subduction convection
98Heat transferred from the wrench to the air. Patti used a steel wrench to work on her bicycle on a hot, sunny day. She left the wrench on the hot concrete for an hour, then returned, to find the wrench very hot to touch. What is the BEST explanation for how the wrench got so hot?Heat transferred from the wrench to the air.Heat transferred from the bicycle to the wrench. Heat transferred from the wrench to the concrete.Heat transferred from the concrete to the wrench.
99How much energy it takes to increase the temperature of 1Kg by 1˚ C. Specific HeatFor a given substance,How much energy it takes to increase the temperature of 1Kg by 1˚ C.26High for conductorsLow for insulators251.00 Kg
100Through which of the following materials does heat travel the fastest Through which of the following materials does heat travel the fastest? glass metal plastic wood
101Beaker X contains 100 milliliters of water and Beaker Y contains 250 milliliters of water. Each beaker is heated on a hot plate at the same medium heat setting for five minutes. Which is the best prediction of the water temperature in the beakers?Beaker X will have the highest temperature. Beaker Y will have the highest temperature. Beaker X and Beaker Y will have the same temperature. Beaker Y will have a temperature of 150°F.
102Suppose you had four spoons the same size and shape made out of glass, plastic, steel, and wood. Which spoon handle would get hot the quickest when the spoons are placed in a pan of hot water?the glass spoon the plastic spoon the steel spoon the wooden spoon
103Burt's mother asked him to use a spoon to stir the stew that was cooking on the stove. Which spoon will stay the coolest while he stirs? an iron spoon an aluminum spoon a wooden spoon a silver spoon
104Chemical Reaction (change) when new substances are produced.Bonds ARE broken.
105Fuel Molecule that stores chemical energy in its bonds. energy stored in the bonds of molecules.FuelMolecule that stores chemical energy in its bonds.
106Which of the following is an example of chemical energy? A baseball moving from thepitcher to the catcherA rock sitting on the top of a large hillA pendulum at the top of its swingA new flashlight battery
107Fossil fuels such as gas, oil, and coal have what kind of energy Fossil fuels such as gas, oil, and coal have what kind of energy? Mechanical energy Chemical energy Electrical energy Nuclear energy
108A burning candle is in the process of transforming heat energy into chemical energy. chemical energy into light and heat. chemical energy into mechanical energy. chemical energy into nuclear energy.
119energy of the motion of an object. 2 = m x V22m = massV = velocity
120The location on the track where the train has the greatest potential energy is Kinetic
121energy of a moving object. Kinetic energyenergy of a moving object.
122When does a toy race car have kinetic energy? rolling down a hill sitting on a shelf upside down on the floor in the toybox with the lid closed
123Bill pulls a rubber band tight to shoot a piece of paper Bill pulls a rubber band tight to shoot a piece of paper. At the point when the rubber band is stretched to its maximum, compare and contrast the amounts of potential and kinetic energy. there is no potential or kinetic energy all potential energy and no kinetic energy all kinetic energy and no potential energy equal amounts of potential and kinetic energy
124Which of the following is an example of kinetic energy? a child jumping ropea swimmer ready to divea stuffed toy lying on a tablefirewood stacked in a fireplace
125When a pitcher throws a baseball, which of these has MOSTLY kinetic energy? the pitcherthe ballthe batterthe catcher
126People in many places in California produce their electricity from wind energy. Which must be true about the winds in these places in California?The winds are cold. The winds blow very little. The winds blow most of the time. The winds blow mostly in the morning.
137WAVES ? Space Kinetic ? Matter Kinetic ? Matter & Space ? ? Matter ? Travels thruWAVES ?Kinet/PotenSpaceKinetic?MatterKineticMatter & Space???Matter?Matterboth
138Conservation of energy Thermodynamics Law 1:.Energy is never created or destroyed.When it is transferred, all of the energy goes somewhere.
139When electrical energy is "used" by an electric light, what really happens to the energy? It is given off as other forms of energy. It changes to matter. It stops at the electric light. It disappears.
140A moving bumper car (car 1) collides with a bumper car at rest (car 2) A moving bumper car (car 1) collides with a bumper car at rest (car 2). After the collision, both cars move. If momentum is conserved, which statement is correct?The momentum of car 1 increases and the momentum of car 2 decreases. The momentum of car 1 decreases and the momentum of car 2 increases. The total momentum of both cars increases. The total momentum of both cars decreases.
141Energy may be changed into other forms with varying efficiency.
142The amount of energy that is changed into the desired form. EfficiencyThe amount of energy that is changed into the desired form.
143In most energy transfers, some energy is turned into thermal.
144Which of the following could best be used to demonstrate energy being transformed from electricity to heat? A magnifying glass A triple beam balance A toaster A gas oven
145Man.What a Junky!8th gradersLOVEjudging others.
147Energy flows from a higher concentration to a lower concentration. Thermodynamics Law 2:Thurm Oh Die namm icksEnergy flows from a higher concentration to a lower concentration.It flows from hot to cold.Disorder tends to increase.
148If all the thermal motion of molecules (kinetic energy) Thermodynamics Law 3:If all the thermal motion of molecules (kinetic energy)could be removed, absolute zero would result.
149Two jars are placed inside an insulated box Two jars are placed inside an insulated box. One jar contains ice water and the other contains hot soup. What will happen to the two liquids?Both the hot soup and the ice water will gain heat. Both the hot soup and the ice water will lose heat. The hot soup will gain heat and the ice water will lose heat. The hot soup will lose heat and the ice water will gain heat.
150Samuel is investigating a substance to determine what it is made of Samuel is investigating a substance to determine what it is made of. He studies the physical and chemical properties of the substance. Which of these properties of the substance is a chemical property ?The melting point of the substanceHow easily the substance bendsThe density of the substanceHow well the substance burns
151Conduction Convection Emission Radiation Ms. Lee heats up a pot of water on her stove. Water heated up at the bottom of the pot flows to the top of the pot. The colder water at the top sinks. As the water moves, heat flows from the hotter water to the colder water. Which of the terms describes this method heat transfer ?ConductionConvectionEmissionRadiation
152Chou lights a candle and the wax begins to melt Chou lights a candle and the wax begins to melt. Which statement describes the movement of the particles as the solid candle melts to a liquid ?The particles move slower and farther apart.The particles move faster and farther apart.The particles move faster and closer together.The particles move slower and closer together.
153Matt adds 5 grams of vinegar to 7 grams of baking soda in a sealed container. Then he watches the chemical reaction. Which of these predicts the mass of the materials in the container after the reaction is complete ?0 grams2 grams12 grams35 grams
154Emily is riding a roller coaster, which moves up a hill slowly and then starts to move faster as it goes towards the bottom of the hill. Where on the hill will Emily have the MOST kinetic energy ?Halfway up the hill.At the top of the hill.Halfway down the hill.At the bottom of the hill.
155The ratio of an object’s mass to its volume is itsAreaDensityPerimeterTorque
156Some people think that the solution to coal, gas, and oil shortages is to use electricity. What is the biggest problem with this solution?Most electricity is produced from coal,gas, or oil.If we switch over to electricity, manypeople will lose their jobs.It is impossible to build electric cars ingreat quantities.Electricity is far too expensive.
157Diving into the ocean, as you go deeper, the water gets colder because the saltiest water is always coldest and sinks to the bottom.there are no waves or wind to mix the hot and cold water.warm water is less dense than cold water, so it stays on top.there are fewer fish and other animals to warm the deep water.
158Jupiter has more mass than Earth Jupiter has more mass than Earth. Which of these statements would be true about the force of gravity on Rubin, if he were able to visit Jupiter ?It would be Zero on JupiterIt would be smaller, but not zero, on JupiterIt would be the same on JupiterIt would be larger in Jupiter
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