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Chemistry
6th -
8thgrade
Endothermic vs. Exothermic Reactions Review
35 questions
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- 1. Multiple ChoiceIn an exothermic reaction, heat is ...taken ingiven out
- 2. Multiple ChoiceIn an endothermic reaction, heat is ,,,taken ingiven out
- 3. Multiple ChoiceWhat type of reaction occurs in a hand warmerexothermicendothermic
- 4. Multiple ChoiceBaking bread and cooking an egg are examples of....?Endothermic processesExothermic processess
- 5. Multiple ChoiceIf a chemical reaction is EXOTHERMIC, temperature of the surroundings would....Stay the sameIncreaseDecrease
- 6. Multiple ChoiceWhen you freeze water, it turns to ice. What process is this?ExothermicEndothermic
- 7. Multiple ChoiceWhen iron nails get rusty, heat is released. What process is this?ExothermicEndothermic
- 8. Multiple ChoiceIn an endothermic reaction the system is releasing energy.TrueFalse
- 9. Multiple ChoiceIs the combustion of gasoline endothermic or exothermic?EndothermicExothermic
- 10. Multiple ChoiceDo reactants in an endothermic reaction have a higher or lower energy than the products?HigherLower
- 11. Multiple ChoiceDuring an endothermic reaction in a beaker if we are part of the surroundings and touched the beaker, it would feel _______.WarmCold
- 12. Multiple ChoiceA chemical reaction that requires energy is aexothermic reactionendothermic reactionover reaction
- 13. Multiple ChoiceThe substances listed on the left side of a chemical equation are theProductsCoefficientsPrecipitatesReactants
- 14. Multiple ChoiceWhat type of reaction is occurring in the diagram? Which response below explains the reason for that type of reaction?Exothermic. Heat is released when the candle (wax) burns.Endothermic. Heat is released when the candle (wax) burns.Exothermic. Heat is taken in when the candle (wax) burns.Endothermic. Heat is taken in when the candle (wax) burns.
- 15. Multiple ChoiceIdentify the reactant(s) and product(s) of the reaction.All three are reactants and none are products.Hydrogen and water are the reactants, and oxygen is the product.Water and oxygen are the reactants, and hydrogen is the product.Hydrogen and oxygen are the reactants, and water is the product.
- 16. Multiple ChoiceA student determines the density, solubility, and boiling point of two liquids, Liquid 1 and Liquid 2. Then he stirs the two liquids together and heats them. After stirring and heating the liquids, two different liquids form, Liquid 3 and Liquid 4. Then the student determines the density, solubility, and boiling point of Liquids 3 and 4. He concludes that a chemical reaction occurred. Here are his results:
How does the student know a chemical reaction has occurred?The student knows that a physical reaction has occurred because Liquids 1 and 2 have different physical properties.The student knows that a chemical reaction has not occurred because Liquids 3 and 4 have different properties than Liquids 1 and 2.The student knows that a chemical reaction has occurred because Liquids 3 and 4 have different properties than Liquids 1 and 2.The student knows that a physical reaction has occurred because Liquids 3 and 4 have different properties than Liquids 1 and 2. - 17. Multiple ChoiceWhich are the reactants in the following reaction?
2Mg + O2 ---> 2MgOMg and OMgOMg and MgOO and MgO - 18. Multiple ChoiceIn a chemical reaction, everything to the right of the arrow are called ______________.productsyieldsmoleculesreactants
- 19. Multiple ChoiceWhat is the little number after an element in a chemical equation called.
Example: H2CoefficientSubscriptAtomEquation - 20. Multiple ChoiceWhen two substances combine chemically, the properties of the products areDifferent from the properties of the reactantsThe same as the properties of the reactantsCompletely unpredictable
- 21. Multiple ChoiceOn a graph, which axis shows the dependent variable?x-axisy-axisneitherit changes
- 22. Multiple ChoiceOn a graph, which axis shows the independent variable?x-axisy-axisneitherit changes
- 23. Multiple ChoiceWhat are the reactants (what's needed) for photosynthesis?glucose and oxygenlight, water, and carbon dioxide
- 24. Multiple ChoiceWhat is the source of energy for photosynthesis?carbohydrates-chemicalsunlight-radiantheat-thermaltelevision-electrical
- 25. Multiple ChoiceWhat gas is released by plants during photosynthesis?sulfurcarbon dioxideoxygenhydrogen
- 26. Multiple ChoiceWhat are the products of photosynthesis?Carbon dioxide and waterCarbon dioxide and oxygenGlucose and oxygenGlucose and water
- 27. Multiple ChoiceIf all four plants were watered daily but placed in a closet, receiving no sunlight, what process would NOT occur?Ingestion of carbon dioxideFiltration of water through the soilPhotosynthesisWater absorbtion
- 28. Multiple ChoiceThe reactants of photosynthesis aresugar and water.sugar and oxygen.carbon dioxide and water.carbon dioxide and oxygen.
- 29. Multiple ChoiceWhich of the following is the correct equation for PHOTOSYNTHESIS?CO2 + light + H2O --> O2 + SugarCO2 + sugar + H2O --> O2 + lightO2 + light + H2O --> CO2 + SugarCO2 + O2 + H2O --> Light+ Sugar
- 30. Multiple ChoiceWhat kind of graph is this?endothermicexothermic
- 31. Multiple ChoiceCompared to the potential energy of the products, the potential energy of the reactants above is?greater thanless thanthe sameimpossible to determine
- 32. Multiple ChoiceIn an endothermic reaction, energy is transferred fromthe reactants to the surroundingsthe surroundings to the reactantsone reactant to anotherthe container to the chemicals
- 33. Multiple ChoiceWhat do the substances on the right side of a chemical equation have in common with substances of the left hand side of a chemical equation?physical propertiesamount of energyatomsmolecules
- 34. Multiple ChoiceWhat forms of energy can be released in a chemical reaction?lightheatsoundall answers are correct
- 35. Multiple ChoiceWhat law states that energy cannot be created nor destroyed?Law of Conservation of EnergyLaw of Conservation of MassLaw of Conservation of MomentumNone of the choices are correct
- Answer choicesTagsAnswer choicesTags