Consider the reaction, C2H4 (g) + H2 (g) - C2H6 (8), where AH = - 137 kJ. How many kilojoules are released when 3.5 mol of CH4

reacts?

480 kJ are released

20 x 103 kJ are released

570 kJ are released

137 kJ are released

Experiment:phase changes, what was the temperature of the ice before you added heat?

Which constants would most likely be filled in the first row of the table? A. temperature and moles of gasB. volume and temperatureC. pressure and volume D. pressure and moles of gas

The atomic weight of hydrogen is 1.00794. a. True b. False

What happens in nuclear fusion? A. Neutrons strike an atom and split it into multiple smaller particles. B. Atoms and subatomic particles combine and release a large amount of energy. C. Neutrons turn into protons in a process known as transmutation.

Magnesium has three naturally occurring isotopes (mg-24, mg-25, and mg-26). the atomic mass and natural abundance of mg-24 are 23.9850 amu and 79 %, respectively. the atomic mass and natural abundance of mg-25 are 24.9858 amu and 10 %, respectively.

Before a race, an athlete warms up by jogging around the track shown below at a constant rate of 2.3 m/s. What statement best describes his motion as he jogs around the curved part of the track?

What physical property is changed when a waitress pours coffee from a pot into four mugs? temperature density volume color

Calcule o calor especifico do estanho sabendo que foram necessarias 100 cal para elevar em 20ºC a temperatura de 100 g de estanho

What's the smallest part of a compound

The inertness of the noble gases is due to a. the outermost shell has six electrons. b. the bonds they form with other elements. c. the number of protons and neutrons. d.