Welcome to the Electronic Learning Environmental (E.L.E.) for physical science and basic chemistry.  Classically,chemical reactions encompass changes that only involve the positions of electrons in the forming and breaking of chemical bonds between atoms, with no change to the nuclei (no change to the elements present), and can often be described by a chemical equation.
   This is a worksheet to provide information for testing purposes.  I wish you well and earn a high grade.  And thank you for using Proprofs and Mitchell's Cosmic Adventure, science website.

5 Sample Questions

Which law states that mass is neither created nor destroyed in a chemical reaction?

  • A. Law of conservation of mass
  • B. Law of conservation of energy
  • C. Law of conservation of antimatter
  • D. Law of conservation of electrons

What were the three fuels used in the Space Shuttle Main Engines?

(Please choose three most correct answers to receive credit for this question.)

  • A. Hydrogen
  • B. Oyxgen
  • C. Hyrazine
  • D. Helium
  • E. Carbon Dioxide

What is  particles of any substance called?

  • A. 1 mole
  • B. 1 Formula Mass
  • C. 1 Molecular Mass
  • D. 1 Atomic Mass
  • E. 1 Atomic Mass Number

Given the chemical formula  . What is the name of this substance?

  • A. Hydrazine
  • B. Nitrogen hydride
  • C. Nitrogen Fluoride
  • D. Nitrogen Bromide
  • E. Diatomic Nitrogen

What are products from the oxidizing (burning) of the molecule Hydrazine?

(Please select two most correct answers from the list below.)

  • A. Hydrazine
  • B. Diatomic Oxygen
  • C. Diatomic Nitrogen
  • D. Water
  • E. Carbon Dioxide

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