For which of the following is heat energy released?

Evaporation

Melting

Condensing

Boiling

I know its either A or D

Which of the following is not an example of a science? geology phrenology astronomy ecology

What is the specific heat of silicon if it takes 192J to raise the temperature of 45.0g of Si by 6.0oC?

Why soft drink is a mixture and water is compound

How many grams of H2 can be formed from 54.6 grams of NH3 in the following reaction? 2NH3 (g) - -> 3H2 (g) + N2 (g)

What is an ionic bond?

Cation a has a + 3 charge and is small. cation b has a + 1 charge and is large. which is more likely to occupy negatively charged sites on a clay mineral given equal concentrations in solution? cation a cation b they are the same

Show your work, including units, for the following series of calculations: a. How many moles of Al are in 1.25 g of Al? b.

An aqueous solution at 25 °C has a pOH of 12.42. Calculate the pH. Round your answer to 2 decimal places

A student records the mass of a piece of iron. The iron is then left outside until it rusts. What type of reaction occurs, and how does the mass of the object after rusting compare with its original mass?

Which one is a true statement about endothermic reactions? A. Energy from an outside source is continuously being added. B. More heat is given off than is put into the reaction. C. The reactants have less heat energy than the last products. D.