Blog

Perform the following calculations, enter your answer with the correct number of significant figures. a.   432 + 7.3 – 28.523 [A] b.   455/407,859 + 1.00098 [B]  

What type of a reaction occurs when a NaOH solution is mixed with an HC2H3O2 solution?

Select the answer in which this equation is properly balanced: __ KNO₃ + __ H₂CO₃ → __ K₂CO₃ + __ HNO₃

the initial first exposure to a pathogen via a humoral immune response…

Perform the following calculation. Show the answer in scientific notation. Round the coefficient to the correct number of sig figs. (Select the BEST answer choice) (3.3 x 108)  x  (6.2 x 10-3) =

Select the answer in which this equation is properly balanced: [C1] Na₃PO₄ + [C2] HCl →[C3] NaCl + [C4] H₃PO₄

39. What is the name of this test (one word answer)? [39] 40.  This experiment was used in an attempt to ID certain carbohydrates.  However, the  tube here labeled as #4 was filled with nothing but water and thus we knew it would be non-reactive (letting us see what a negative looks like).  In the world of scientific examination, what would you call this tube in reference to the rest of the experiment (one or two words max)? it is a _______________________________________  [40]

Which of the following is not an example of evaluation criteria?

Select the answer in which this equation is properly balanced: [C1] C₂H₆ + [C2] O₂ →[C3] CO₂ + [C4] H₂O

Identify the oxidation-reduction reactions among the following: Zn (s) + Cu2+ (aq)  →  Zn2+ (aq) + Cu (s) 2 Na (s) + Cl2 (aq)  →  2 NaCl (s) 2 Mg (s) + O2 (g)  →  2 MgO (s)