Ch 14 and 15 Test
Quiz by Tracy
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35 questions
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- Q1What is the most important indicator that a chemical change has occurred?it gives off heatit changes colorit changes phasesa new substance is formed30s
- Q2How many carbon atoms in brown sugar? (C12H22O11)221211130s
- Q3Which of the following is a covalent bond?Copper and ZincPotassium and Chlorinesodium and chlorinehydrogen and oxygen30s
- Q4How many carbon atoms in this formula? 3C12H22O111215113630s
- Q5What is melting crayons an example of?chemical changenuclear changephysical changechemical reaction30s
- Q6What makes chemical bonds break?substances are combined in a solutionmolecules bump into each other with a lot of energyliquid dissoliving solidstemperature change30s
- Q7Is the following equation balanced?YesNo30s
- Q8What is an example of a physical changeleaves changing colorsfireworks explodingphase changeburning a match30s
- Q9How do chemical bonds break?making a solutionwhen molecules have enough energy, bump into each other and breakforming a precipitatelowering the temperature30s
- Q10What is the charge of an ionic compound?031230s
- Q11Which of the following is an ionic compound?MgOCl2O2CH430s
- Q12How many oxygen atoms are present in the equation 4Mg + 3(O2) ----- 2(Mg2O3)462330s
- Q13What would decrease the rate of a chemical reaction?adding a catalystincreasing the surface area of a substanceadding an inhibitorincreasing the temperature30s
- Q14Which of the following is a catalyst?lowers the activation enery of a reactionchanges the reaction permenantlyslows the rate of reactionstops a reaction30s
- Q15What is the law of conservation of mass?the reactants have more mass than the productsatoms are never gained or lost in a reactionatoms are created and destroyedthe products will have more mass than the reactants30s