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What is the oxidation number for the chlorine atom in the compound, potassium chlorate, KClO3?

Three separate 3.5 g blocks of Sn, Hg and Cr are heated from 25°C is heated to 75°C. Which block requires absorbtion of the most amount of heat (q) to reach the final temperature?  

Consider the reaction below: H2S (g) + Cl2 (g) → S (s) + 2 HCl (g) The element                   is undergoing reduction and                     is the reducing agent.

A system releases 89 kJ of heat and has 111 kJ of work done on it. What is the value of ΔE (in kJ) for the system?

What is the concentration (in M) of iodide ions when 0.200 moles of FeI3 is dissolved in 950 mL of water?

Copper (II) hydroxide is formed in the following reaction: CuSO4 (aq) + 2 NaOH(aq) →  Cu(OH)₂ (s) +  Na2SO4 (aq)  How much copper(II) hydroxide precipitate (in g) is formed when 35.0 mL of 0.612 M NaOH reacts with an excess of CuSO4?   Hint: Molar mass for Cu(OH)2 is 97.57 g/mol

A system performs 94 kJ of work on its surroundings and gains 43 kJ of heat. What is the value of ΔE (in kJ) for the system?

Based on the activity series, which of the following solutions would result in a spontaneous single displacement reaction with zinc metal?

Copper (II) hydroxide is formed in the following reaction: CuSO4 (aq) + 2 NaOH(aq) →  Cu(OH)₂ (s) +  Na2SO4 (aq)  How much copper(II) hydroxide precipitate (in g) is formed when 25.0 mL of 0.612 M NaOH reacts with an excess of CuSO4?   Hint: Molar mass for Cu(OH)2 is 97.57 g/mol

Calculate ΔH (in kJ) for the reaction: