Other Chemistry Answers

Explain the processes which are used for the extraction of metals from carbonates and sulphide ores.

A student titrates a sample with HCl solution using methyl red as indicator and finds it contains 20% K2CO3. Later he realises his sample contained Na2CO3 instead of K2CO3. What is the % concentration of Na2CO3 in the sample?

How many grams of ethane gas (C2H6) are in a 12.7 liter sample at 1.6 atmospheres and 24°C? Show all work used to solve this problem.

what is the type of error (positive or negative) during the calculation of concentration if the following occurs:
during the volumetric analysis of Potassium hydrogen phthalate, a solution of NaOH contaminated with CO2 was used.

If 100 grams of potassium (K) reacts with 260 grams of iodine (I2) to form potassium iodide (KI), which is the limiting reactant? If the percent yield is 80% how much KI is produced?

A student analyzes a sample and finds out it contains 25% of NaCl. After that he realises the sample contained KCl instead of NaCl. What is the % concentration of KCl in the sample?

is there two chemical liquids that make an endothermic reaction?

Hye,can I know what are the the difference between sitosterol and beta sitosterol?

What kind of overall charge does an atom have if there is the same numbers of protons and electrons? Explain

Sodium bicarbonate (NaHCO3) is often used in the kitchen to extinguish fires. When heated, it decomposes into sodium carbonate, water vapour and carbon dioxide. The delta H for the reaction of 1 mole of sodium bicarbonate is +64.6KJ.
a) Write a balanced thermochemical equation for this reaction.
b) Using the enthalpies of formation, calculate the enthalpy of formation of sodium bicarbonate