Chemical changes can affect physical and chemical properties, whereas physical changes can affect___. A. chemical properties B. physical properties C. both chemical, and physical properties D. None of the above

The equilibrium constant, Kc, for the following reaction is 56.0 at 278 K. 2CH2Cl2 (g) CH4 (g) + CCl4 (g) When a sufficiently large sample of CH2Cl2 (g) is introduced into an evacuated vessel at 278 K, the equilibrium concentration of CCl4 (g) is

What two parts are found in the nucleus

Which of the following statements about physical models is not true? a. Physical models are often three-dimensional representations. b. Physical models are used to represent an object or event. c. Physical models are usually in the form of a graph.

Calculate [H3O+] for each solution. pH=3.98

How many molecules of sulfur dioxide are present in 1.60 moles of sulfur dioxide

Which element easily loses one electron to form a positive ion? A. Magnesium (Mg) B. Lithium (Li) C. Nitrogen (N) D. Fluorine (F)

What is an indication a chemical reaction has occurred? A.) Formation of gas B.) Boiling of a substance C.) Melting of a substance D.) Freezing of a substance

A saline solution contains 1.6 % NaCl by mass. How much NaCl is present in 57.2 g of this solution?

During a laboratory experiment you discover that an enzyme-catalyzed reaction has a delta G of - 20 kcal/mol. If you double the amount of enzyme in the reaction, what will be the delta G for the new reaction

What is the molarity of a hydrochloric acid solution prepared by diluting 200.0 ml of 0.500m hcl to a total volume of 1.00 l?