5 Written questions
5 Matching questions
- a A substance that decreases the hydrogen ion concentration in a solution. 14 is a strong base on the pH scale.
- b The smallest unit of matter that retains the properties of an element.
- c Measures the intensity of heat.
- d One of several atomic forms of an element, each with teh same number of protons but different number of neutrons.
- e 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.
5 Multiple choice questions
- The making and breaking of chemical bonds, leading to changes in the composition of matter.
- 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.
- Rain, snow or fog that is more acidic than pH 5.2.
- A liquid that is a homogeneous mixture of two or more substances.
5 True/False questions
Element → The dissolving agent of a solution. Water is the most versatile solvent known.
What 4 elements make up about 96% of living matter? → Oxygen, carbon, hydrogen, and nitrogen.
Radioactive Isotope → An isotope whose nucleus decays spontaneously, giving off particles and energy.
Cohesion → A liquid that is a homogeneous mixture of two or more substances.
Electron → A subatomic particle with a single negative electrical charge. One or more electrons move around the nuclues of an atom.