5 Written Questions
5 Matching Questions
- Electron Shells
- Hydrogen Bonds
- a An energy level representing the distance of an electron from the nucleus of an atom.
- b A type of weak chemical bond formed when the partially positive hydrogen atom participating in a polar covalent bond in one molecule is attracted to the partially negative atom participating in a polar covalent bond in another molecule (or in another region of the same molecule).
- c Two or more atoms held together by covalent bonds.
- d One of several atomic forms of an element, each with teh same number of protons but different number of neutrons.
- e A substance that decreases the hydrogen ion concentration in a solution. 14 is a strong base on the pH scale.
5 Multiple Choice Questions
- The sum of the number of protons and neutrons in an atom's nucleus.
- A liquid that is a homogeneous mixture of two or more substances.
- A subsctance that cannot be broken down to other substance by ordinary chemcial means.
- A substance that is dissolved in a solution.
- The total mass of an atom; also called atomic weight. Given as a whole number, the atomic mass approximately equals the mass number.
5 True/False Questions
Buffers → A chemical substance that resists changes in pH by accepting hydrogen ions from or donating hydrogen ions to solutions.
substance that minimize changes in pH.
Surface Tension → A measure of how difficult it is to stretch or break the surface of a liquid. Water has a high surface tension because of the hydrogen bonding of surface molecules.
Acid → The smallest unit of matter that retains the properties of an element.
Neutron → A subatomic particle having no electrical charge, found in the nucleus of an atom.
Proton → An ending material in a chemical reaction.