Chem 1201 LSUE Borill Exam 1 | 258 Questions With Complete Correct Answers.

An element has three stable isotopes with masses of 27.977 amu, 28.976 amu, and 29.973 amu. The heavier two isotopes have an abundance of 4.68% and 3.09%, respectively. What is the mass of the element? A) 27.684 amu B) 29.251 amu C) 28.085 amu D) 30.107 amu E) 28.991 amu - Answer 28.085 amu All of the following will lead to a homogeneous mixture EXCEPT A) sugar and coffee. B) mud and water. C) salt and water. D) ice tea and lemonade. E) vinegar and water. - Answer mud and water. How are gases different from solids and liquids? A) Gases can only be made up of atoms. B) The particles in a gas attract each other much more strongly than in solids and liquids. C) Gases are compressible. D) Only gases can take the shape of their container. E) Gases are colorless. - Answer Gases are compressible. A scientific law A) is a brief statement that summarizes past observations and makes predictions. B) is subject to change via legal action. C) contains an explanation of observations.D) must have a mathematical formula. E) cannot be modified. - Answer is a brief statement that summarizes past observations and makes predictions. All statements about scientific theories are true EXCEPT A) they explain why nature behaves the way it does. B) they must have the ability to make predictions on future behavior. C) they should use observations to test the theory. D) they are derived from hypothesis. E) they are speculation. - Answer they are speculation A sample of a compound containing only carbon and oxygen decomposes and produces 24.50g of carbon and 32.59g of oxygen. What is the sample? A) CO B) CO2 C) CO3 D) C3O2 E) C2O - Answer CO