5 Written questions
5 Matching questions
- pH Scale
- Trace elements
- a An ending material in a chemical reaction.
- b A scale we used to describe how acidic or basic a solution is. The scale ranges from 0-14, 0 being the most acidic and 14 being the most basic. 7 is neutral (pure water)
- c an element that is essential for life but required in extremely minute amounts.
- d A liquid that is a homogeneous mixture of two or more substances.
- e A subatomic particle having no electrical charge, found in the nucleus of an atom.
5 Multiple choice questions
- The total mass of an atom; also called atomic weight. Given as a whole number, the atomic mass approximately equals the mass number.
- Two or more atoms held together by covalent bonds.
- A compound resulting from the formation of ionic bonds; also called an ionic compound.
- Rain, snow or fog that is more acidic than pH 5.2.
- Neutrons and protons.
5 True/False questions
Atomic Number → The number of protons in each atom of a particular element.
Solute → A substance that is dissolved in a solution.
Base → A substance that decreases the hydrogen ion concentration in a solution. 14 is a strong base on the pH scale.
Electron → A subatomic particle having no electrical charge, found in the nucleus of an atom.
Buffers → An atom's central core, containing protons and neutrons.