【创新方案】高中英语Module5SectionⅣ写作讲座Grammar&Writing专题练习外研版必修1请根据下列表格中的内容，写一篇120词左右的短文，说明整个实验的内容
实验目的镁在空气中燃烧是否有变化实验用品镁(magnesium)，本生灯(Bunsenburner)，天平秤(abalance)，坩埚(acrucible)实验步骤1
首先把镁放进坩埚内，2
然后把坩埚放在天平上称一下，3
下一步点燃本生灯，把坩埚放在上面，给镁加热，4
最后称镁的重量实验结果镁比原来重了一点实验结论镁在空气中燃烧重量上有变化[参考范文]Theaimoftheexperimentistofindoutifthere'sachangewhenmagnesiumburnsinair
Tocarryouttheexperiment，youneedthefollowingthings:magnesium,Bunsenburner,abalanceandacrucible
Whenallthesethingsareready,youcanbegintheexperiment
First,putthemagnesiuminthecrucible
Thenputthecrucibleonthebalanceandweighit
Next,heatthemagnesium
LighttheBunsenburnerandholdthecrucibleoverit
Finally,weighthemagnesiumagain
Youcanseeitweighsalittlemorethanbefore
That'sbecausethereisachangeinweightwhenmagnesiumburnsinair
