Page 463 - Chemistry eBook

57 CompaTrehetheqbuoaitlionng bpeolionwt orfeapNreasNenOts asorleuaticotnioant bsteatnwdeaernd eptrheessnuereantod thyedbrogileing. point
of water at standard pressure. [1]
HH
H C C H + H H H C C H
HH
59 Stat atoms in one molecule of the reac
60 Explain,intermsofactivationenergy,whythecatalyzedreactionoccursatafasterrate. [1]
3
Base your answers to questions 58 through 61 on the information below and on your knowledge of chemistry.
Sample Regents Questions
Ethene and hydrogen can react at a faster rate in the presence of the catalyst platinum. The equati5o8n bDeelotewrmreipnreesthenetms aolraeramctiaosns obfetwheepnroedthuecnt.e a[n1]d hydrogen.
e the number of electrons shared between the carbon
HH
tant ethene. [1]
58 Determine the molar mass of the product. [1]
61 Explain why the reaction is classified as an addition reaction. [1]
59 State the number of electrons shared between the carbon atoms in one molecule of the reactant ethene. [1]
60 Explain,intermsofactivationenergy,whythecatalyzedreactionoccursatafasterrate. [1]
61 Explain why the reaction is classified as an addition reaction. [1]
Answer
Because two reactants combine to form a single product.
-OR-
Two substances form one.
P.S./Chem.–Jan. ’14 [9] -OR-
Two hydrogen atoms are added to C=C. -OR-
Hydrogen atoms are added to the ethane molecule at the site of the carbon-carbon double bond
HH
HCCH+HH HCCH HH
Jan 2014 #61
to form a single molecule.
P.S./Chem.–Jan. ’14 [9] [OVER]
[OVER]
UNIT 11: ORGANIC CHEMISTRY © 462