Consider the following reactions. (Note: (s) = solid, (l) = liquid, and (g) = gas.)

Mg (s) + ½O2 (g) → MgO (s) + 146 kcal/mole

H2 (g) + ½O2 (g) → H2O (g), ΔH = - 57.82 kcal/mole

The temperature of the surroundings will:

increase

decrease

Which statement about the atomic nucleus is correct

The site for all chemical reactions that take place in the cell is the

Use the pull-down boxes to specify states such as (aq) or (s). If a box is not needed leave it blank. If no reaction occurs leave all boxes blank and click on "Submit". Use H3O + for hydronium ion.

How many electrons does the atom silicon have?

Why would you be cautious of scientific information you hear from advertisers?

The mineral vanadinite has the formula pb5 (vo4) 3cl. what mass percent of chlorine does it contain?

What is the energy of a photon of green light with a frequency of 5.76 times 10 to the fourteenth s to the negative one

Which statement describes a physical change? a. A carton of milk souring b. A piece of silver flatware tarnishing c. Dry ice subliming into carbon dioxide d. Two clear solutions forming a precipitate when mixed

What are two types of local winds?

For a given reaction, adding a catalyst increases the rate of the reaction by (1) providing an alternate reaction pathway that has a higher activation energy (2) providing an alternate reaction pathway that has a lower activation energy (3) using