CHM 130 Final Lab exam With Correct Answers.

Using a balanced chemical equation, identify a reaction that was performed in the Chemical Reactions lab that produced bubbles of hydrogen gas. - Answer Zn(s) + 2 HCl(aq) -- ZnCl2 +H2 Using a balanced chemical equation, identify a reaction that was performed in the Chemical Reactions lab that could be identified as a combustion reaction. - Answer 2 Mg(s) + O2 -- 2 MgO A student needs to prepare 2.00 grams of NiCO3 from K2CO3 and Ni(NO3)2 *6H2O. The precipitate in this reaction has the formula ________________. Provide the balanced equation for this reaction. - Answer NiCO3; K2CO3 +Ni(NO3)2 *6H2O -- NiCO3 + 2KNO3 +6H2O Identify the following reaction as a combination, single displacement, double displacement, combustion, or decomposition reaction: P4(s) + 5O2 -- P4O10 - Answer combination Identify the following reaction as a combination, single displacement, double displacement, combustion, or decomposition reaction: H2SO4(aq) + Zn(s) -- ZnSO4(aq) + H2(g) - Answer single displacement Identify the following reaction as a combination, single displacement, double displacement, combustion, or decomposition reaction: H2CO3(aq) -- CO2(g) + H2O(l) - Answer decomposition Identify the following reaction as a combination, single displacement, double displacement, combustion, or decomposition reaction: CaCl2(aq) + Na2CO3 -- 2NaCl(aq) + CaCO3(s) - Answer double displacement Identify the following reaction as a combination, single displacement, double displacement, combustion, or decomposition reaction: Fe(s) + CuSO4(aq) -- Cu(s) + FeSO4(aq) - Answer single displacement Define specific heat. - Answer the amount of heat needed to raise the temperature of exactly one gram of a particular substance by 1°C. A solid of an unknown composition dissolves completely when stirred with 1 mL of water. No bubbling is observed when vinegar is added to the dry solid. The mixture turns color(to yellow)