Pre-lab Quiz

Select all signs of a chemical reaction

• phase change (melting or boiling)

• gas evolution

• color change

• formation of a precipitate

Students are required to record

• at least one data set

• at least three data sets

• some sort of observation, maybe

• nothing

Students must wear their goggles

• only when handling chemicals

• only when near chemicals

• until they become uncomfortable

• at all times during lab

when setting up apparatus, students should

• take the whole bottle or tray of chemicals to their work space, to ensure that nobody else can use them

• take things one at a time, so that everyone has to make many trips

• take only the chemicals and apparatus necessary using a tray or box, to make work more efficient

• balance chemicals and glassware on whatever books or pencils are available

When beginning the lab, students should

• start by getting out chemicals and then read the procedure

• start the first step of the procedure immediately

• read the plan and the teacher's comments before doing anything

• ask the teacher to read the plan to them

Chemical tests require

• a huge amount of chemicals

• as much chemicals as you can possibly fit into a beaker

• all the chemicals available or perhaps more

• a small amount of chemical; less than half a gram

Data sets should be recorded

• promptly and according to plan

• after the fact, according to memory

• when the scribe remembers

• on the back of last week's homework

The results of today's lab

• will be necessary to complete the presentation next class

• will never be used

• will not be graded

• will be dangerous toxic waste

Select all true statements about lab procedures

• lab stations should be cleaned up for the next class

• lab stations will be cleaned up by the teacher

• if an experiment does not go as expected, you should throw away the data

• goggles should be worn until the instructor notifies you that it's okay to take them off

A reaction in which NO₃ breaks apart into N₂ and O₂ is called

• a decomposition reaction

• a synthesis reaction

• a double displacement reaction

• a single displacement reaction