Accetylene gas (C2H2) is often used by plumbers,welders,and glass blowers because it burns in oxygen with an intensely hot flame.The products of the combination of accetylene are carbon dioxide and water vapour .Write the unbalanced chemical equation for this process.

1. A Cu-Ni alloy of composition 70 wt% Ni - 30 wt% Cu is slowly heated from a temperature of 1300°C. (1) At what temperature does the first liquid phase form? What is the composition of this liquid phase? (2) At what temperature does complete melting of the alloy occur? Composition (at% Ni) 40 0 16007 30 1500 Temperature (°C) 1400 1300 1200 13h00 1100 e 1000 T 1085°C 0 ko (Cu) 1 20 20 Liquid 1345 C Liquidus line 40 60 First liquid (59 wt% Ni) a +L Solidus line 60 Composition (wt% Ni) (a) 80 T 80 1453°C Last solid (79 wt% Ni) 100 1380°C 2800 2600 2400 2200 2000 Temperature (°F) 100 TATRA (Ni)

Two equal masses of C and Au were heated by absorbing 30 KJ, which one of the following is correct? Specific Heat Capacity (Jlg-K) Elements Aluminum, Al 0.900 Graphite,C 0.711 Iron, Fe 0.450 Copper, Cu 0.387 Gold, Au 0.129 Select one: O AT (C) AT (Au) Given data is not enough to compare O AT (Au) = AT (C) %3D

please answer d-f ,please.