General Chemistry Answers

write an equation to show that perchloric acid and HCIO4 behaves as acid in water

. The galvanizing of iron sheet can be carried electrolytically using a bath containing zinc sulfate solution. The sheet

is made the cathode, and a graphite anode is used. Calculate the cost of electricity required to deposit 0.49 mm

layer of zinc on both sides of an iron sheet 2.0 m wide and 80m long if the current is 30 A, the voltage is 3.5 V, and

the energy efficiency of the process is 90%. Assume the cost of electricity is Php 12.50 per kilowatt-hr. The density

of zinc is 7.1g/cm3.

Identify whether the following processes are endothermic or exothermic.

1. Thermal decomposition of limestone to form calcium oxide (CaO) and carbon dioxide
2. Explosion of a firecracker triggered by a spark
3. Combustion of hydrogen gas
4. Dissolving an acid in water
5. Baking bread
6. Heating causes sodium bicarbonate (NaHCO₃) to decompose

In the laboratory you dissolve 20.9 g of copper(II) iodide in a volumetric flask and add water to a total volume of 500 mL.

What is the molarity of the solution?  _____M.

What is the concentration of the copper(II) cation?  ______M.

What is the concentration of the iodide anion?  ______M.

Ca(OH)2+2HCI=>CaCl2+H2O how many grams of H2O are produced when 86.4 grams of Ca(OH)2 reacts with 89.7 grams of HCI?

In the laboratory you dissolve 20.9 g of copper(II) iodide in a volumetric flask and add water to a total volume of 500 mL.

What is the molarity of the solution?  ________ M.

What is the concentration of the copper(II) cation? ___________ M.

What is the concentration of the iodide anion?  _____________ M.

How many mL of 0.548 M HCl are needed to dissolve 5.89 g of CaCO₃?

2HCl(aq) + CaCO₃(s)  CaCl₂(aq) + H₂O(l) + CO₂(g)

 _____________mL

A breakdown of the solid structure of a substance occurs

In the laboratory you dissolve 13.9 g of ammonium acetate in a volumetric flask and add water to a total volume of 250 mL.

What is the molarity of the solution?  _________M.

What is the concentration of the ammonium cation?  _______M.

What is the concentration of the acetate anion?  _______M.