Grade 7 - Chapter 2 _ Lab guide
Quiz by Rouba Jabbour
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20 questions
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- Q1The skull and crossbones are a classic warning sign, but can you name the type of danger?toxic or poisonous materialsdangerous to eat/drink, but otherwise safegeneral danger from chemicalsflammable materials30s
- Q2When you are finished using a bunsen burner or heater you should:Pull off the hose connecting the burner to the gas. The burner won't have gas, so it won't be on fire.Leave it on for the next person to use. It's the only considerate choice.Cover the burner with an inverted beaker to suffocate the flame. It works well for candles, too.Turn off the gas30s
- Q3You should pipette by mouth:Only when you are sure your instructor, lab assistant, or co-worker isn't looking.Only when you can't find a pipette bulb or think it might be dirty.Always. It's a fast and efficient method of measuring liquids.Never30s
- Q4The sign that shows the letter X meansdon't store chemicals herepotentially harmful chemical, usually an irritating substancedo not entergeneral warning sign to be used to indicate a “No”30s
- Q5Your glassware is clean enough to eat off, which is why you poured yourself a refreshing glass of water into a beaker to quench your thirst. Too bad you didn't label it. You should:Food and drinks don't belong in the lab.Label it before you forget which beaker it is.Go on with your business.Just be really careful about keeping it separate from other beakers filled with clear liquid.30s
- Q6The symbol that shows a circle surrounded with fire meanscombusting agentno open flamesflammable, keep away from heatheat-sensitive explosive30s
- Q7The symbol that shows fire meansno open flamesexplosive materialflammable, keep away from heat or flamecombusting agent30s
- Q8The symbol that shows 2 test tubes pouring chemicals on 2 hands that are harmed meansCorrosive, attacks living tissuedangerous liquid, don't touchcut or burn hazardharmful to non living tissue30s
- Q9Why wouldn’t you begin an experiment until the teacher has instructed you to?teacher might warn you of areas of dangerteacher might show you how to set up the equipmentteacher might point out the best way of doing the experimentall answers30s
- Q10A symbol showing dead tree and fish meansvery toxic and poisonous substancecombusting agentflammable materialharmful to living tissues only30s
- Q11The small cylinder like glassware put in racks are calledtest tubecylinder tubepipettesmall lab tube30s
- Q12A lab tool that helps you pour liquids into bottles with small opening is calleda beakermortar and pestlean erlenmeyera funnel30s
- Q13a lab glassware used for storing and preparing solutions but not for measuring volumes is calleda graduated cylindera volumetric flaska beakeran erlenmeyer30s
- Q14The best glassware used only for measuring volumes of liquids isthe graduated cylinderthe volumetric flaskthe beakerthe erlenmeyer30s
- Q15A lab tool used to crush solid chemicals is calledgrinderpowder blendermortar and pestlecrusher30s