Which of the following phase changes involves a decrease in entropy?

vaporization of liquid mercury

solid metal melting to form a liquid

condensation of water vapor to form dew

sublimation of dry ice into carbon dioxide gas

When water surrounds substances that have been "broken apart": Hydration Dissociation Dissolving

How much heat is absorbed when 447 g of water, Cp = 4.184 J/goC, goes from 25.0 oC to 35.0 oC?

Suppose that a certain fortunate person has a net worth of $77.0 billion ($). If her stock has a good year and gains $3.20 billion () in value, what is her new net worth? Express your answer to three significant figures.

A chemist dissolves 660. mg of pure hydroiodic acid in enough water to make up 300. mL of solution. Calculate the pH of the solution. Round your answer to 3 significant decimal places.

the movement of heat through touching molecules is called: A. conduction B. convection C. radiation

Consider n2 (g) + 3h2 (g) →→ 2nh3 (g). what is the mass of nitrogen gas required to react with 0.129 g h2?

Write a sentence that uses the words "mass extinction" correctly

Which description is not a property of an acid? A turns litmus paper red B bitter taste C corrosive D dissolve metals

Concerning the 10.0 mL of 0.50 M NaCl diluted to 100 mL of solution: When a solution is diluted, does the dilution change the number of grams dissolved? yes no

What causes element name to change