When applying heat to a substance changes the form, but not the identity of the substance, this is evidence of:

a chemical change

a physical change

no change

an anthropomorphic change

Calculate the missing variable. M1 = 4.0 M V1 = 450mL M2 = ? V2 = 800mL

How many grams of Ar are there in 2.25 moles of Ar?

Which BEST describes the difference between speed and velocity?

Stars can be classified into groups based on their a) size b) temperature c) proximity to earth d) proximity to the sun

The k + ion has an electron structure that is identical to which inert gas?

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?

How does a metallic bond differ from an ionic bond

Give two examples of chemical energy being transformed into electrical energy