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5 Written questions

5 Matching questions

  1. First shell of an atom can contain how many electrons?
  2. Solvent
  3. What 4 elements make up about 96% of living matter?
  4. Evaporative Cooling
  5. Element
  1. a The dissolving agent of a solution. Water is the most versatile solvent known.
  2. b A subsctance that cannot be broken down to other substance by ordinary chemcial means.
  3. c occurs because the molecules with the greates energy leave.
  4. d Oxygen, carbon, hydrogen, and nitrogen.
  5. e 2

5 Multiple choice questions

  1. A molecule containing polar covalent bonds and having an unequal distribution of charges.
  2. The sum of the number of protons and neutrons in an atom's nucleus.
  3. A substance that decreases the hydrogen ion concentration in a solution. 14 is a strong base on the pH scale.
  4. A liquid that is a homogeneous mixture of two or more substances.
  5. The smallest unit of matter that retains the properties of an element.

5 True/False questions

  1. Ocean AcidificationRain, snow or fog that is more acidic than pH 5.2.


  2. Electron ShellsAn energy level representing the distance of an electron from the nucleus of an atom.


  3. ElectronegativityThe attraction of a given atom for the electrons of a covalent bond.


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


  5. IonThe smallest unit of matter that retains the properties of an element.