Thermal Energy in Chemical Reactions
Quiz by Nussbaum, Marjorie (DCPS)
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37 questions
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- Q1When food is placed in a refrigerator it cools. Is this an endothermic reaction?no, because it is an exothermic reactionno, because there is no chemical change happeningyes, because the heat from the food is removed by the refrigeration system and put into the outside airyes, because cooling causes a chemical change in the food30s
- Q2Thermal energy is transferred from _______________________ to ______________________.areas of lower energy...areas of higher energyareas of higher energy...areas of lower energyareas of cold...areas of warmareas of less molecular movement...areas of more molecular movement30s
- Q3In a chemical reaction, energy is needed tocomplete the reactionstart the reactionassemble the new productsbreak and form the chemical bonds between the atoms30s
- Q4Which statement about atoms and molecules is correct?Atoms are the smallest particles of matter that retain all the characteristics of that matter and molecules are built from atomsWhen molecules bond with other molecules atoms are producedIf a type of matter is made of molecules, it is an elementMolecules are the smallest particles of matter that retain all the characteristics of that matter and atoms are built from atoms30s
- Q5Endothermic reactions occur whenall of these answersthe reaction produces heatmore energy is stored in the bonds of the products than was present in the reactantsthe reaction produces precipitates30s
- Q6Exothermic reactions occur whenmore energy is released as the chemical bonds are broken and reformed than is needed to maintain the reactionmore energy is stored in the bonds of the products than were present in the reactantsthe bonds that hold chemicals together are formedthe bonds that hold chemicals together are broken30s
- Q7We can tell that a chemical reaction has occurred bya change in colora change in temperatureany of these can indicate that a chemical reaction has occurreda change in appearance30s
- Q8Hand warmers use what kind of reaction to produce heat?exothermicchemicalphysicalendothermic30s
- Q9The source of the thermal energy [heat] that is given off during an exothermic reaction isthe energy released when the reactant bonds are brokenthe energy released when the reactants form new productsenergy is released from all of these optionsthe energy released when the product bonds are broken30s
- Q10During photosynthesis, plants store energy from _________________ as ____________________.the air/carbohydrateswarm water/sugarsthe soil/sugarssun/carbohydrates30s
- Q11Precipitates areliquid substances formed when two or more solid substances are combinedtypes of reactants that form solidssolid substances formed when liquid substances are combinedsolid substances that can be combined chemically30s
- Q12What are the ingredients for photosynthesis?water/soil/photonswater/nitrogen/sunlightcarbon dioxide/sunlight/ hydrogenwater/carbon dioxide/photons30s
- Q13Suppose you were shown a graph showing the temperature change over time in a chemical reaction. The graph shows a upward line as time elapses [goes past]. What kind of reaction is this?endothermicit could be any type of reactionexothermicchemical bonding30s
- Q14Energy cannot betranslateddestroyedtransferredtransformed30s
- Q15A reactant isone of the chemicals that is produced in a chemical reactionone of the chemicals that is combined in a chemical reactionone of the chemicals that is produced in an exothermic chemical reactionone of the chemicals that is produced in an endothermic chemical reaction30s