If the heat involved in a chemical reaction has a negative sign,

A. heat is lost to the surroundings.

B. heat is gained from the surroundings.

C. no heat is exchanged in the process.

Which statements are true of precipitation reactions? Check all that apply. A. They are also double-replacement reactions. B. The products are liquids. C. All of the solids are removed from the solution. D. They are also redox reactions.

How many electrons occupy p orbitals in a bismuth atom?

Why does the flask have to be closed during the water and alka seltzer reaction?

Phosphorus trichloride, PCl3, decomposes to form elemental phosphorus and chlorine. The equation is: 4PCl3 → P4 + 6Cl2. Balance the equation and determine the mass in grams of chlorine that would be formed if 25 grams of PCl3 (molecular mass = 137.

The product of the synthesis reaction between sodium and chlorine gas is a. polyethylene. c. sodium chloride. b. carbon dioxide. d. copper (II) chloride.

How does phosphorus enter the human body?

When a reaction occurs between atoms with ground state electron configuration 1s2 2s1 and 1s2 2s2 2p5 the predominant type of bond formed is

How does heat transfer takes place between any two systems?

Hydrate name of CaCl2 * 8 H2O

Calculate the heat evolved from a mixture of 14.1 l of sulfure dioxide