What is the term used to describe the energy needed to get a reaction started?

a. adhesion energy

c. cohesion energy

b. activation energy

d. chemical energy

Which of the following is a constant for 1 mole of any ideal gas

The transition elements are in Groups A. coinage metals B. iron triad C. alkaline earth metals D. alkali metals

Calculate the temperature, in k, of 2.20 moles of gas occupying 3.30 l at 3.50 atm.

Antarctica, which is mostly ice, is much colder than the arctic, which is a mixture of ice and water. why?

In electrophilic aromatic substitution reactions, which of the following molecules are considered to be less reactive than benzene?

A 1-cubic-centimeter cube of sodium reacts more rapidly in water at 25°C than does a 1-cubic-centimeter cube of calcium at 25°C.

Calculate the voltage if the current is 0.5 A and the resistance is 2.0 Ω.

Moseley's changes to the periodic table were based mainly on what part of the scientific process

Which of the following precautions is important when using a Bunsen burner or Meker burner? a. Set up your work space so that wires and cables cannot accidentally make contact with the flame or hot glassware and meltb.

What explains the fact that no machine is 100 percent efficient? A. Friction transforms mechanical energy into thermal energy. B. Thermal energy is transformed into mechanical energy by friction. C.