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.

Mia is researching famous scientists and their contributions to biology, chemistry, and physics. Which of the following scientists developed the current naming system used to classify organisms? A. Mendel B. Darwin C. DeBakey D. Linnaeus

What events caused the formation of most islands in the South Pacific? A) earthquakes B) hurricanes C) meteors D) volcanoes

Select the correct text in the passage. Which sentences describe examples of sustainable living? I live in an old apartment building downtown, but my company is based in an office park on the outskirts of the city.

How many moles in 6.92 L of SO2 gas at STP?

Cream of tartar has a pH that is (acidic or basic)

What kind of ions do a sodium atom and a chlorine atom become when a valence electron is transferred from one to the other?

NaOH and bleach have several characteristics in common. They include all BUT one of the characteristics listed.

What is the general form for the simplest type of acid-base reaction?

Which element has a larger atomic radius than sulfur? chlorine cadmium fluorine oxygen

Which of the following procedures is used when refining petroleum? Increase the temperature of the oil. Decrease the temperature of the oil. Increase the pressure of the oil. Decrease the pressure of the oil.