C2H4(g) + 3O2(g) —> 2CO2(g) + 2H2O(g) change in H1 = ?

The combustion of C2H4 is represented by the equation above.

Use the enthalpies of formation in the table the calculate the value of change in H1 for the reaction.

There are main groups in the modern periodic table of elements

Classify this reaction: 2al+n2-> aln.

6. using 3 – 4 sentences explain (in your own words) why water expands when it freezes? 7. using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. use 3 – 4 sentences in your explanation.