You suspect an unknown compound possesses a disubstituted alkene. Select all pieces of spectroscopic information that must be present if your hypothesis is correct. signals in the 13C NMR spectrum around 140 ppm
stretch in the IR spectrum at approximately 1650 cm-1
signals in the 13C NMR spectrum around 200 ppm
signals in the 1H NMR spectrum around 5.5 ppm
stretch in the IR spectrum at approximately 1700 cm-1
stretch in the IR spectrum at approximately 2200 cm-1
signals in the 1H NMR spectrum around 10.0 ppm
stretches in the IR spectrum immediately above 3000 cm-1
broad stretch in the IR spectrum at approximately 3500 cm-1

Answer is in the photo. I couldn't attach it here, but uploaded it to a file hosting. link below! Good Luck!

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answer: any goods being imported from another country may be subject to issued by the federal government are tariffs

explanation:  

tariffs are a tax on anything that are imported from abroad. government use them to protect and boost their local industries and the thought is that they encourage consumers to buy local instead of importing and they will hope will protect jobs and economy in the country that implements them  

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol