Determining the oxidation numbers of a compound.

What is the oxidation number of chlorine in perchloric acid, HClO4?

Volume

What volume of .320 M HCL (hydrochloric acid) is required to react with 25 mL of .180 M Ba(OH)2 (barium hydroxide)?

Determining which solutions will form a precipitate when mixed together.

What precipitate forms when solutions of the following are mixed: K+, Ca2+, NH4 1+, and Cl-, NO3 1-, CO3 2-?

Calculating how many moles are present in a solution.

How may moles of ions are present in 500 mL of a 0.400 M solution of aluminum sulfate, (Al2(SO4)3)?

lab report

i am attaching a lab report my son submitted please review and response with what is wrong and what would you think an appropriate grade would be for this work I am requesting an academic review on this and require assistance prior to meeting with the administration My son is an 8th grade student taking up course in chemist ...continues

Determining the formula of a hydrate.

When all of the water of hydration was driven off of 4.32g of a hydrate of compound Z, the residue, the anhydrous form of Z, had a mass of 3.09g. What is the formula of the hydrate (using the symbol Z as part of it)? The formula mass of Z is 90.0

Calculating the empirical formula of a compound.

Determine the empirical formula of each compound from the following data. 1. Talc (used in talc powder) has mass composition 19.2% Mg, 29.6% Si,42.2% O, 9.0% H. n=m/mm

Specific heat - What is the mass of copper?

Copper has a specific heat of 0.382 J g-1 degrees Celsius -1. The temperature of an unknown mass of copper increases by 4.50 degrees Celsius when it absorbs 3.97 J of heat. What is the mass of copper?

Calculating the final temperature of a substance undergoing a heat loss.

Commercial cold-packs consist of solid ammonium nitrate and water. Ammonium nitrate absorbs 330 J of heat per gram dissolved in water. In a coffee-cup calorimeter, 2.00 g of ammonium nitrate are dissolved in 75.0 g of water at 30 degrees Celsius. Assuming that all of the heat is lost from the water, what is the final temperatu ...continues

Calculating the heat capacity of a substance burned in a bomb calorimeter. Solution provides the specific calculation steps.

A 1.000-g sample of benzoic acid, C7H6O2, is burned in a bomb calorimeter. The temperature of the calorimeter increases by 7.53 degrees Celsius. What is the heat capacity of the calorimeter in units of kJ degrees Celsius -1? Please note that (3.09)(10^3)kJ of heat are liberated per mole of benzoic acid combusted.