Q.1
Tearing paper into small pieces is a -
  • chemical change
  • chemical reaction
  • nuclear reaction
  • physical change
Q.2
Your bicycle rust when left outside. This is evidence of a -
  • chemical change
  • physical change
  • nuclear reaction
  • physical reaction
Q.3
How many elements are present in this compound?NaHCO3
  • 1
  • 2
  • 3
  • 4
Q.4
How many elements are in this compound?B6Cl2OH
  • 4
  • 3
  • 2
  • 1
Q.5
HeBased on this symbol, what can you tell about Helium (He)?
  • Helium is a compound
  • Helium is an element
  • helium is a metal
  • helium is a mixture
Q.6
CO + H > CO2 + H2Which substance represented in this equation is classified as an ELEMENT?
  • CO
  • H2O
  • CO2
  • H2
Q.7
Which list contains only elements and a reason why they are elements?
  • H2O, NaCl, N2, CO2, Substances are elements because they they contain more than one chemical symbol.
  • Kr, Ne, Ar, He, Substances are elements because they are noble gases.
  • Cl2, H2, Na, He, Substances are elements because they are pure.
  • F2, O2, Li, H, Substances are elements because they all have chemical symbols.
Q.8
When you add pickle juice to baking soda you observe bubbling and fizzing. What can you determine about the new substance that has been formed?
  • A chemical reaction produced a solid.
  • A chemical reaction produced a gas.
  • No chemical reaction occurred.
  • Only a physical change occurred.
Q.9
Which contains only CHEMICAL changes (new substance formed or cannot be undone)?
  • Silver spoon tarnishLeaves change colorWater separating into hydrogen and oxygen
  • Ice melting Sugar Cube dissolvingPaper tearing
  • Dry ice goes from solid to liquid Your breath condensing on a windowGlass breaking
  • Mixing flour, salt, and sugarSanding woodGrinding something into powder
Q.10
Water ( H2O) is a compound because-
  • it is made of two different elements
  • useful to humans
  • a gas at room temperature
  • given off by plants
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