chemistry

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A.  Multiple Choice

en ammonia breaks down to form hydrogen gas and nitrogen gas?
     A. NH3 + H2 → N2                             B. NH3 → N1. Which chemical equation correctly represents the decomposition reaction that takes place
    wh + H

     C. N2 + H2 → NH3                             D. NH3 → N2 + H2

2. When propane is reacted in the presence of oxygen gas, the products of this combustion
    reaction are:
   A. C + H2                                     B. CH2 + H2O

   C. CO2 + H2                                D. CO2 + H2O

3. In a decomposition reaction:
   A. the reactants are usually a metal and a nonmetal

   B. one of the reactants is often water

   C. the reactants are generally two ionic compounds in aqueous solution

   D. energy in the form of heat or light is often produced

4. Synthesis reactions always:

  A. use only one reactant

  B. form only one product

  C. involve an element and an ionic compound

  D. require oxygen gas

5. Of the reactions below, which one is a double-replacement reaction?
 A. NH4Cl → NH3 + HCl                                      B. 2 Mg + O2 → 2 MgO

 C. 2 N2 + 3 H2 → 2 NH3                                    D. Cd(NO3)2 + Na2S → CdS + 2 NaNO3

6. The chemical equation, Cr + Fe(NO3)2 → Fe + Cr(NO3)3, is an example of which type of
   reaction?
   A. decomposition                               B. single-replacement

   C. double-replacement                     D. combustion

 

7. The chemical equation, KClO3 → KCl + O2, is an example of which type of reaction?
   A. decomposition                    B. single-replacement

   C. double-replacement          D. combustion

8. Which of the following are decomposition reactions?

  1. CH4 + O2    →   CO2    + H2O

  2. CaO    + CO2    → CaCO3

 3. Mg   + O2   →  MgO

 4. PbCO   →   PbO  + CO2

A. 2 and 3                B. 2, 3, and 4                  C. 4 only                       D. All are decomposition reactions.

 

9. Of the balanced chemical equations below, which one is combustion reaction?

A. 2 CH4 + 4 O2 → 2 CO2 + 4 H2O

B. CaO + H2O → Ca(OH)2

C. 2 N2 + 3 H2 → 2 NH3

D. 2 Mg + O2 → 2 MgO

10. In the following chemical reaction, what product is represented by X?

    AlCl3 + NaOH → X + NaCl

  A. AlOH

  B. Al(OH)3

  C. Al3OH

  D. It cannot be determined



B.  Answer the following Question

1.   List the 5 type of chemical reactions

     _________________________________________________________________________

     _________________________________________________________________________

2.  The type of chemical reaction that produces CO2 and H2O is ________________________

3.  The 2 examples of chemical reaction that produce CO2 and H2O in everyday life  are:

     1) ______________________________________________________________________

     2) ______________________________________________________________________

4.  List the 6 possible evidence that a chemical reaction has occurred.

    _________________________________________________________________________

    _________________________________________________________________________

5.  Chemical reaction is the process of ____________________________________________

6.  All chemical reactions must follow the Law of _____________________________ which
    state that ______________________________________________________________

    

Circle Yes or No to this question for number 7, 8, 9, and 10.  
Do this chemical reactions satisfy the Law of Conservation of Mass (number of atom before and after reaction must be equal)?

7.   H2   +   O2    →   H2OYes / No

8.   Mg   +    O    →  MgOYes / No

9.   H2    +   Br2   →  2HBrYes / No

10. Ca    +   HBr    →  CaBr2  +  HYes / No

 

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