CHEM 130 Chapter Notes - Chapter 2: Semimetal, Chemical Equation, Dmitri Mendeleev

In 1808, John Dalton proposed a series of statements regarding the atom that became known as Dalton's postulates or Dalton's atomic theory. Since Dalton's original proposal, some of the statements have been updated or changed due to new discoveries. Which of the following statements was not a part of Dalton's original atomic theory? Atoms cannot be created or destroyed in a chemical reaction. Different elements have atoms of different masses and properties. Atoms of the same element have the same size, mass, and structure. Matter is comprised of small particles called atoms. All four statements are part of Dalton's original atomic theory.

choose the right answer?A student performs an experiment to determine the density of a sugar solution. He obtains the following results: 1.10 g/mL, 1.71 g/mL, 1.96 g/mL, 1.77 g/mL. If the actual value for the density of the sugar solution is 1.74 g/mL, which statement below, best describes his results? His results arc precise, but not accurate.His results arc both precise and accurate.His results arc accurate, but not precise.It isn't possible to determine with the information given.His results are neither precise nor accurate. Dalton's Atomic Theory statesthat all elements have several isotopes. that an atom is predominantly empty space. that energy is neither created nor destroyed during a chemical reaction. that the properties of matter are determined by the properties of atoms. that matter is composed of small indestructible particles.