Which best describes H2 (g) + cl2 (g) - - > 2hci (g), h = - 184.6 kJ/mol?

A. the reaction has no activation energy.

B. the reaction is endothermic.

C. the reaction requires heat.

D. the reaction produces heat.

One similarity between a small, solid sample of aluminum and a large, liquid sample of aluminum is that both samples have A a definite shape. B a definite volume. C the same number of atoms. D the same amount of energy.

How many subshells are in the n = 4 shell?

Explain, in terms of atomic structure, why group 18 elements on the periodic table rarely form compounds

How will the substance change if energy is added to the liquid at 20 degrees celsius

The molar mass of a certain gas is 49 g. what is the density of the gas in g/l at stp?

Write a word equation for the extraction of tin from tin oxide using carbon

What is the electron configuration for neon?

Whats a pure substance that can not be broken down into any other substances?

Does the moon's shadow change relative to the sun

Which of the following is the least reactive nonmetal,?