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5 Written questions

5 Matching questions

  1. Base
  2. Buffers
  3. Isotopes
  4. Temperature
  5. Atom
  1. a A substance that decreases the hydrogen ion concentration in a solution. 14 is a strong base on the pH scale.
  2. b The smallest unit of matter that retains the properties of an element.
  3. c Measures the intensity of heat.
  4. d One of several atomic forms of an element, each with teh same number of protons but different number of neutrons.
  5. 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

  1. The making and breaking of chemical bonds, leading to changes in the composition of matter.
  2. 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.
  3. Rain, snow or fog that is more acidic than pH 5.2.
  4. A liquid that is a homogeneous mixture of two or more substances.
  5. 2

5 True/False questions

  1. ElementThe dissolving agent of a solution. Water is the most versatile solvent known.

          

  2. What 4 elements make up about 96% of living matter?Oxygen, carbon, hydrogen, and nitrogen.

          

  3. Radioactive IsotopeAn isotope whose nucleus decays spontaneously, giving off particles and energy.

          

  4. CohesionA liquid that is a homogeneous mixture of two or more substances.

          

  5. ElectronA subatomic particle with a single negative electrical charge. One or more electrons move around the nuclues of an atom.

          

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