Given the following heats of combustion: C2H2 (g) = - 1300 kJ/mole, H2 (g) = - 286 kJ/mole, C2H6 (g) = - 1560 kJ/mole, Calculate the enthalpy change for the following reaction C2H2 (g) + 2H2 (g) → C2H6 (g)

a. - 312 kJ

b. - 26 kJ

c. + 312 kJ

d. - 26 kJ

Is cutting a sheet of paper in half a physical or chemical change

Which of these processes indicates that smelting copper is a chemical change? It involves melting copper to form liquid metal. It involves heating charcoal to high temperatures. It involves drawing copper into long wires.

Indicate the relationship between the two structures in the pair. are they chair conformations of the same molecule? if so, are they conformational diastereomers, conformational enantiomers, or identical?

An example of a model in science larger than the real object

What are 2 factors that should be considered when planning to use solar power?

The electric force between two charged objects is 0.24 newtons. If the distance between them is increased by a factor of 4, what will be the new force? A. 0.015 newtons B. 0.03 newtons C. 0.06 newtons D. 0.12 newtons E. 0.36 newtons

Why do you need a balanced equation for stoichiometry?

The density of gold is 19.3 g/cm3. What is the volume of a 13 g gold nugget?

Glucose, C6H12O6, C6H12O6, is used as an energy source by the human body. The overall reaction in the body is described by the equation C6H12O6 (aq) 6O2 (g) ⟶6CO2 (g) 6H2O (l) C6H12O6 (aq) 6O2 (g) ⟶6CO2 (g) 6H2O (l) Calculate the number of grams of

Which two bases pair with each other?