List the memorized strong bases. Can water act as an acid? Explain! A student pl

Question

List the memorized strong bases. Can water act as an acid? Explain! A student places 44.3 g of zinc in the graduated cylinder with 12.2 mL of water. The zinc causes the water to go up to 14.1 mL. Calculate the density of zinc. Calculate the atomic weight of silicon on the basis of the following percent composition and atomic weights of the naturally occurring isotopes. Compare the calculated value with the atomic weight listed on the periodic chart on the back page of this exam. Silicon-28 = 92.21% (27.9769 amu) Sihcon-29 = 4.70% (28.9765 amu) Silicon-30 = 3.09% (29.9798 amu) A flammable gas is known to contain only carbon and hydrogen. Its molecular weight is determined and found to be 28.05 amu. Which of the following is the likely identity of the gas? Acetylene (C_2H_2), ethylene (C_2H_4), ethane (C_2H_6). Two iron ores that have been used as sources of iron are magnetite (Fe_3O_4) and hematite (Fe_2O_3). Which one contains the higher mass percentage of iron? Find the density of water vapor at STP. Using the read ants listed below, write the formula equation, ionic equation, and netionic equation for the following reactants. Be sure to indicate the state of the

Explanation / Answer

1. Density = mass/volume

mass of zinc = 44.3 g

volume of zinc = 14.1 - 12.2 = 1.9 ml

Thus,

density of zinc = 44.3 g/1.9 ml = 23.31 g/ml

2. Atomic weight of Silicon

= (27.9769 x 0.9221 + 28.9765 x 0.0470 + 29.9798 x 0.0309)

= 29.7975 + 1.362 + 0.9264

= 28.086 amu

3. The identity of flammable gas with atomic weight 28.05 amu would be ethylene (C2H4).

4. Of the two ores, Fe content is greater in Magnetite when comapred to haematite.

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