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1. Classify the following analyses as qualitative or quantitative:



A pregnancy test kit (available from the supermarket) involves the addition of urine to a chemical impregnated stick, and a colour change occurs.
A chlorine test where the colour of a chemical is compared against reference standards to estimate the chlorine levels in a home swimming pool.
Placement of a detector in the exhaust pipe of a car during a tune-up procedure to measure the levels of carbon monoxide emissions
Testing for caffeine in a coffee that claims to be caffeine free
Using an instrument to perform an analysis of the preservatives in a bottle of apple juice to check the claim that it contains only preservatives "202 and 211"
Adding a piece of test-tape to urine to estimate the glucose level present in the urine
Instrumental checking of the level of lead in a sample of soil from a house
Analysis of a brand of potato chips to verify that it contains less than 1g of salt per 100g of chips




 
2. The labels of two popular 1.25 L bottles of mineral water give the following information:

 
		TYPICAL ANALYSIS (mg/L)


 

HCO3-

Cl-

Mg2+

Na+

Ca2+

SO42-

K+


Savings

508

53

43

42

27

16

5


Farmland

146

20

12

19

23

- 

3


 
(a) Give the names of the ions listed above
(b) Which of the ions above are cations?
(c) Is this information the result of qualitative or quantitative analysis?
(d) Which of the mineral waters would be more beneficial for those on a low salt diet?
(e) What mass of chloride ions are present in 1.25L of both products?
(f) Determine the mass of each individual ions that would be present in one glass (200 ml) of the "Savings" water.
(g) Determine the molar concentration of all the anions in the "Savings" water
(h) Which species of ions would form a precipitate when mixed with silver nitrate solution?
(i) Sometimes the term "ppm" is used on a label. What does this mean?
(j) What do the terms v/v, m/v and m/m mean?
 

Q3. Are the following statements true or false? ... You should be able to get at least 21 (80%) correct! 

(a) Water is an element
(b) Acids turn litmus blue
(c) A compound is a pure substance
(d) Acids produce hydrogen ions in water
(e) Copper salts turn a flame green
(f) Zinc is less reactive than iron
(g) An atom is made up of molecules
(h) Vinegar is citric acid
(i) Calcium carbonate is soluble in water
(j) A base neutralises an acid
(k) The symbol for sodium is Ne
(l) A proton has a negative charge
(m) Carbon dioxide is insoluble in water
(n) Water consists of two parts oxygen and one part hydrogen
(o) Sodium hydrogen carbonate is a base
(p) Reductants lose electrons
(q) The atomic number of carbon is 12
(r) An iron nail will undergo a redox reaction with copper sulfate solution
(s) Protons orbit the nucleus in shells
(t) Magnesium will react with acids to produce hydrogen
(u) Isotopes are atoms with the same number of protons but different numbers of neutrons
(v) Potassium easily loses one electron to form a cation due to it's low electronegativity
(w) The electron configuration of Iron is 2, 8, 14, 2
(x) The octet rule predicts that Oxygen will want to gain 3 electrons
(y) The atomic mass of potassium is lower than that of argon even though potassium has more protons
(z) Phenolphthalein is pink/red in acids