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Chemical Reactions Pre-assessment

14 Questions  I  By Jkrug
Chemical Reactions pre-assessment

  
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Question Excerpt

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1.  Which of the following statements is true about what happens in all chemical reactions?
A.
B.
C.
D.
2.  Which of the following is the correct skeleton equation for the reaction that takes place when solid phosphorus combines with oxygen gas to form diphosphorus pentoxide?
A.
B.
C.
D.
3.                      When the equation   KClO3 (s)  à  KCl (s) +  O2 (g)  is balanced, the coefficient of KClO3 is
A.
B.
C.
D.
4.  What does the  triangle symbol  above the arrow in a chemical equation mean?
A.
B.
C.
D.
5.  When the equation    Fe  +  Cl2   à FeCl3 is balanced, what is the coefficient for Cl ?
A.
B.
C.
D.
6.  When the following equation is balanced, what is the coefficient for HCl? Mg(s)  +  HCl (aq) à   MgCl2 (aq) + H2 (g)
A.
B.
C.
D.
7.                       Which of the following combinations of symbol and explanation of symbol is correct when used in a chemical equation?
A.
B.
C.
D.
8.  The equation Mg(s) + 2HCl(aq) --> MgCl2(aq) + H2(g) is an example of which type of reaction?
A.
B.
C.
D.
9.  Chemical reactions
A.
B.
C.
D.
10.  A net ionic equation
A.
B.
C.
D.
11.                       In a combustion reaction, one of the reactants is
A.
B.
C.
D.
12.  In the chemical equation    H<sub>2</sub>O<sub>2</sub>  à  H<sub>2</sub>O   +  O<sub>2</sub>f       the  O<sub>2</sub>  is a ____.
A.
B.
C.
D.
13.  The equation H3PO4 + 3KOH  --> K3PO3 + 3H2O is an example of which type of reaction?
A.
B.
C.
D.
14.                  The reaction 2Fe  + 3Cl2   --> 2FeCl3 is an example of which type of reaction?
A.
B.
C.
D.
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