Q.1
The word oxidation describes
  • gain of electrons
  • loss of electrons
  • number of electrons remains the same
  • number of electrons transfered
Q.2
The word reduction describes
  • gain of electrons
  • loss of electrons
  • number of electrons remains the same
  • transfer of electrons
Q.3
What type of reaction is illustrated below?2HI --> H+ I2
  • synthesis
  • decomposition
  • single replacement
  • double replacement
Q.4
Which of the following options correctly balances the equation below?__HNO2 + __O2 --> __HNO3
  • 4, 1, 4
  • 1, 2, 1
  • 1, 2, 1
  • 2, 1, 2
Q.5
Which of the following is NOT a sign of a chemical reaction?
  • Color changes
  • Cutting into fourths
  • Light is produced
  • Gas is formed
Q.6
True or FalseIn a chemical reaction, no new atoms are created, and no atoms are destroyed.
  • true
  • false
Q.7
A metal is reacted with an acid to produce a salt and a hydrogen gas. What type of reaction has occurred?
  • neutralization
  • double replacement
  • single replacement
  • synthesis
Q.8
What are the correct coefficients when this equation is balanced?KClO--> KCl + O2
  • 2,2,2
  • 2,2,3
  • 1,2,3
  • 3,3,3
Q.9
Which half reaction shows the element being reduced. In the following reaction. 2Na + Cl--> 2NaCl
  • Na0   --> Na+1   +   1e-
  • Cl20  +  2e-  --> 2Cl-
  • Na0  +  1e- --> Na+1
  • Cl20 --> 2Cl-  + 2e-
Q.10
Potassium iodide is a catalyst in a chemical reaction where would this be placed when writing the chemical reaction?
  • product side
  • reactant side
  • above the arrow
  • left out
Q.11
A compound is reacted and forms two new substances. What type of reaction is this?
  • combustion
  • synthesis
  • decomposition
  • single replacement
Q.12
An element plus additional element reacts to form one product is an example of which type of chemical reaction?
  • combustion
  • decomposition
  • synthesis
  • single replacement
Q.13
Predict the following reaction NaCl + Ca(NO3)2 -->
  • no reaction both products are aqueous
  • Calcium chloride and sodium nitrate are produced
  • sodium nitrate is a solid formed
  • calcium chloride is the solid formed
Q.14
Provides evidence that a chemical reaction has occurred.
  • dissolving
  • melting
  • formation of a gas
  • bending
Q.15
Describes the number of molecules in a compound and is used to balance a chemical reaction.
  • coefficient
  • subscript
  • superscript
  • SI unit
Q.16
Which of the following compounds will not disassociate in water?
  • NaCl
  • PbCl2
  • MgNO3
  • Na2SO4
Q.17
Magnesium reacts with hydrochloric acid to produce magnesium chloride and hydrogen gas this happens because?
  • Magnesium is higher on the reactivity series then hydrogen
  • magnesium is more reactive than hydrogen
  • magnesium is able to break the bond between HCl and form MgCl2
  • both b and c are correct
Q.18
Describes the number of atoms in a compound of each element.
  • coefficient
  • superscript
  • subscript
  • SI unit
Q.19
Balance this equation._CF4 + _Br2 -- _CBr4 + _F2
  • 2,1,2,1
  • 1,2,2,1
  • 1,2,1,2
  • 2,2,2,2
Q.20
How many HCl molecules do you need to balance this equation? Mg + __HCl ---> MgCl2 + H2
  • 1
  • 2
  • 3
  • 4
0 h : 0 m : 1 s