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Chemistry
7th -
8thgrade
Grade 7 Exam Review Solutions and Mixtures
35 questions
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- 1. Multiple ChoiceWhat is a solvent?The substance that does the dissolving in a solution.The substance that is being dissolved in a solution.The mixing of different substances.The process in which neutral molecules lose or gain electrons
- 2. Multiple ChoiceThis is the part of a solution that dissolvesSoluteSolventSolutionMixture
- 3. Multiple ChoiceThe concentration of a mixture can be increased in which of the following ways?Heating the mixtureAdding more water “solvent”Adding more powder “solute”Stirring the mixture
- 4. Multiple ChoiceIn the above picture, a powder is about to be poured into the liquid. Which of the following should be done to make this powder dissolve faster?
stir the powder in the liquidfreeze the mixtureadd more powder to the liquidstore the mixture in a dark place - 5. Multiple ChoiceA solution that is considered dilute would be....Dark in colorHave a strong scentHave a large amount of soluteHave a small amount of solute
- 6. Multiple Choicesalt water is acompoundelementheterogeneous mixturesolution
- 7. Multiple Choicewhat a solute dissolves insolventmixturesolute
- 8. Multiple ChoiceKool-Aid - Powder, sugar, and water
Identify the solventwaterpowdersugarpowder and sugar - 9. Multiple ChoiceLemonade - Water, lemon juice, and sugar
Identify the solutewaterlemon juicesugar and lemon juice - 10. Multiple ChoiceWhen solute dissolves into a solvent it is called a _____________.mixturesolutionelement
- 11. Multiple ChoiceWhen a certain amount of solvent cannot hold any more solute it is called a ________ solution.DilutedSaturated
- 12. Multiple ChoiceWhen Koolaid mix is light colored and tastes watery it is a _______ solution.saturateddiluted
- 13. Multiple ChoiceWhen a Koolaid mix in water is dark in color and very sweet it is a __________ solution.concentratedDiluted
- 14. Multiple ChoiceTo make a solute dissolve more quickly i n a solvent which would you do?Put it in cold water and stir itPut it in warm water and stir it
- 15. Multiple ChoiceIf I added 27 grams of salt to water and separated the solution by evaporation, what amount of salt would be left behind?20 grams0 grams27 grams10 grams
- 16. Multiple ChoiceContains the maximum amount of dissolved soluteunsaturated solutionsupersaturated solutionsaturated solution
- 17. Multiple ChoiceWhat does it mean to be "Soluble" ?Capable of being a solid.To have soul.Capable of being dissolved.To sink.
- 18. Multiple ChoiceAn unsaturated solution is one that....contains the maximum amount of dissolved solute.contains less solute than a saturated solution.contains more solute than a saturated solution.is the amount of a substance required to form a saturated solution.
- 19. Multiple ChoiceWhich of the following would decrease the rate of solution when dissolving a solid in water?Raise the temperature of the solutionCrush the solid before mixingStir the solution after mixingUse a single cube of solid
- 20. Multiple ChoiceA way to increase the amount of sugar dissolved in tea is tocrush and coolcrush and leave alonecrush and heat
- 21. Multiple ChoiceIf you add more sugar to tea that is already saturated (without changing the temperature):some of the sugar will dissolvethe sugar will fall out of the solutionall of the sugar will dissolve
- 22. Multiple ChoiceA student adds salt to water in a test tube but no more salt dissolves. The solution is:supersaturatedsaturatedunsaturated
- 23. Multiple ChoiceWhich of the following will cause a lump of sugar to dissolve faster?chopping it into piecesstop stirring the wateradding more sugaradding cold water
- 24. Multiple ChoiceWhich of the following best separates a mixture of iron filings and black pepper?magnetfilter papertriple beam balancevoltmeter
- 25. Multiple ChoiceThe equipment shown at the right can be used to separate the parts of a mixture based onboiling pointsmelting pointmagnetismparticle size
- 26. Multiple ChoiceA mixture of water, sugar, and sand is poured into a filter. What passes through the filter?only the wateronly the sandwater and sugarwater and sand
- 27. Multiple ChoiceWhich of the following materials is soluble in water?oilgreasepeppersugar
- 28. Multiple ChoiceAfter a solid is added to a liquid, it is found that all of the substances are spread out evenly. This combination of substances is best described asa mixture, but not a solutiona mixture and a solutiona solution, but not a mixtureneither a mixture nor a solution
- 29. Multiple ChoiceThe rate of solubility of a solid in a liquid can be increased bystirring the liquidusing larger solute particlescooling the liquiddecreasing the surface area of the solid
- 30. Multiple ChoiceAn increase in the rate of dissolving is caused by a decrease in thetemperatureparticle sizeamount of stirringsurface area
- 31. Multiple ChoiceSand and iron particles that are similar in size and color are mixed together in a beaker. What method can be used to separate these particles?Use tweezers to separate them.Use a magnet to separate them.Add water to the mixture.Pour the mixture into a filter.
- 32. Multiple ChoiceWhich of the following substances is soluble in water?oilsaltsandgrease
- 33. Multiple ChoiceWhich of the following dissolves the fastest?sugar cubes in iced teagranulated sugar in iced teasugar cubes in hot teagranulated sugar in hot tea
- 34. Multiple ChoiceWhich process can separate dissolved salt from water?filtrationcondensationevaporationcentrifuging
- 35. Multiple ChoiceWhat might happen if you mixed a strong acid with an equally strong base?You would see an explosive chemical reaction.The acid would destroy the base.The base would destroy the acid.You'd wind up with a pH-neutral substance.
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