Chemistry Answers

ACTIVITY 1

Consider the following equation:

Ca(OH)2(s) + 2 HCl(aq) —> CaCl2(aq) + 2 H2O(l)

a) How many liters of 0.100 M HCl is required to completely react with 5.00 grams of calcium hydroxide?

b) If 15.0 grams of calcium hydroxide is combined with 75.0 mL of 0.500 M HCl, how many grams of calcium chloride would be formed?

ACTIVITY 1

Consider the following equation:

Ca(OH)2(s) + 2 HCl(aq) —> CaCl2(aq) + 2 H2O(l)

2. What is the relationship between amino acids and the nitrogenous bases of purines and pyrimidines?

3. What is cloning? Cite its advantages and disadvantages.

Determine all possible ratios for the following balanced chemical equations.

3Fe(s)+4H2O(l) Fe3O4(s)+ 4H2(g)

3 Zn + 2 MoO3 → Mo2O3 + 3 ZnO

a. How many grams of ZnO can be formed when 20 g of MoO3 reacts with 20 g of Zn?

b. Identify the limiting reagent and excess.

c. How many grams of the other product can be produced?

d. Draw a picture of the system.

1. 0.0050 grams of a chemical is dissolved in 75 grams of water. What is the concentration of the chemical in parts per million? 

1. 0.0050 grams of a chemical is dissolved in 75 grams of water. 

What is the concentration of the chemical in parts per million? 

What is the Cr-Cr bond order in the complex [Cr2(μ-O2CCH3)4(OH2)2] ?

If free heme in aqueous solution is exposed to dioxygen (O₂), it is converted almost immediately to a dimer

a. ferritin

b. ferryl complex

c. hematin

d. oxyhaemoglobin

Calculate the ∆H for the reaction:

CS2 + 2 O2 CO2 + 2 SO2

Given:

∆Hf CO2 = -393.5 kJ/mol

∆Hf SO2 = -296.8 kJ/mol

∆Hf CS2 = 87.9 kJ/mol