5 Written questions
5 Matching questions
- Law of Definite Proportions
- Molar mass
- Average Atomic Mass
- a the fact that a chemical compound contains the same elements in exactly the same proportions by mass regardless of the size of the sample or source of the compound
- b the weighted average of the atomic masses of the naturally occurring isotopes of an element
- c atom of an element that has a number of neutrons different from that of other atoms of the same element
- d the mass in grams of 1 mol of a substance
- e the tiny, dense central portion of an atom, composed of protons and neutrons
5 Multiple choice questions
- 1897- Idea of a subatomic negatively charged particle (electron). Made Plum Pudding model of the atom.
- a subatomic particle that has no charge and that is found in the nucleus of an atom
- created by Ernest Rutherford. Replaced the Plum Pudding Model. Atom is like a miniature solar system with the positive particles in the middle and the negative particles orbiting as the planets do around the center.
- The number of protons in the nucleus of an atom.
- the sum of the numbers of protons and neutrons in the nucleus of an atom
5 True/False questions
Quark → the amount of a substance that contains as many particles as there are atoms in exactly 12 g of carbon-12
Law of Conservation of Mass → the weighted average of the atomic masses of the naturally occurring isotopes of an element
Law of Multiple Proportions → if two or more different compounds are composed of the same two elements, then the ratio of the masses of the second element combined with a certain mass of the first element is always a ratio of small whole numbers
Plum Pudding Model of the atom → atoms are balls of positively charged material with negative electrons scattered throught
Proton → a subatomic particle that has a positive charge and that is found in the nucleus of an atom