An experiment is conducted in order to determine the mass of silver metal in an alloy. The alloy is dissolved in acid to convert all of the silver metal to silver ions, and those ions are then precipitated by reaction with excess sodium chloride. The precipitate is washed, dried and weighed, and the following data are collected.
Mass of silver alloy = 4.3148 g
Mass of filter paper = 0.50000 g
Mass of filter paper and dried precipitate 1.9332 g
Identify the precipitate and the number of moles of it produced in the gravimetric analysis?
What is the % by mass of silver in the alloy?
At the end of the experiment it is found that the actual (real) % of silver in the alloy is lower than the % calculated from the experimental data. Which of the following is the most likely explanation for the difference between the actual (real) value, and the calculated value?
The complete combustion of one mole of a hydrocarbon in oxygen, yields carbon dioxide and water in a molar ratio of 3CO
2 : 4H 2O. What is a possible formula for the hydrocarbon?
When 2.299 g of sodium are brought together with 2.000 g of fluorine and the reaction below occurs.
(s) + F 2(g) → 2NaF (s)
What is the maximum mass of sodium fluoride that can be produced?
When the reaction is repeated, this time introducing 1.000 mole of Na metal with 0.5000 moles of F
2 gas, it is found that 21.00 g of NaF are produced. What is the percentage yield in this experiment?
Consider the combustion of ammonia shown in the equation below. Which of the following statements is true in relation to this reaction?
3 + 5O 2 ⇒ 4NO + 6H 2O
A 100. mL sample of 0.100 M Li
2CO 3 solution is poured into a beaker that contains to 50.0 mL of 0.300 M Ba(NO 3) 2 solution. A precipitate is observed. Which of the following correctly predicts the contents of the beaker at the end of the reaction?
What type of interaction (force or bond) is changed when solid magnesium chloride is melted?
Chemical changes always involve the breaking of which type of interaction (force or bond)?
How might one recognize a change as being purely a physical one?
What type of change takes place when solid sodium chloride is dissolved in distilled water?