CHM 130 Final Lab exam questions and answers pass guaranteed

Using a balanced chemical equation, identify a reaction that was performed in the Chemical Reactions lab that produced bubbles of hydrogen gas. - correct answers 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. - correct answers 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. - correct answers 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 - correct answers combination Identify the following reaction as a combination, single displacement, double displacement, combustion, or decomposition reaction: H2SO4(aq) + Zn(s) -- ZnSO4(aq) + H2(g) - correct answers single displacement Identify the following reaction as a combination, single displacement, double displacement, combustion, or decomposition reaction: H2CO3(aq) -- CO2(g) + H2O(l) - correct answers decomposition Identify the following reaction as a combination, single displacement, double displacement, combustion, or decomposition reaction: CaCl2(aq) + Na2CO3 -- 2NaCl(aq) + CaCO3(s) - correct answers 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) - correct answers single displacement Define specific heat. - correct answers 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) when only 41 drops of iodine solution is added to the mixture. List each substance that is present. - correct answers ascorbic acid A solid of an unknown composition does NOT dissolve completely when stirred with 1 mL of water. Much bubbling is observed when vinegar is added to the mixture. More than 50 drops of iodine solution are added before the mixture turns color(to blue).List each substance that is present. - correct answers ascorbic acid, baking soda, and cornstarch A solid of an unknown composition does NOT dissolve completely when stirred with 1 mL of water. No bubbling is observed when vinegar is added to the mixture. Only 1 drop of iodine solution is added before the mixture turns color(to blue). List each substance that is present. - correct answers cornstarch Write the formula for nitrous acid. - correct answers HNO2 Write the formula for tin(IV) bromide. - correct answers SnBr4 Write the formula for potassium carbonate. - correct answers K2CO3 Write the formula for diboron trisulfide. - correct answers B2S3 Write the formula for nitrogen gas. - correct answers N2 Write the formula for the compound PCl5. - correct answers Phosphorus pentachloride Write the formula for the compound HF(as an acid). - correct answers Hydrofluoric acid Write the formula for the compound Mn(NO3)2 *4H2O - correct answers Manganese(II) tetra hydrate When any element in the gas phase is excited to the point where it emits visible light, the spectrum obtained is a________________________________. - correct answers spectrum consisting of lines of different colors Atoms emit visible light as electrons ________________________________________________. - correct answers move from higher to lower energy levels. What is the color of phenolphthalein in basic solution? - correct answers pin